diff options
Diffstat (limited to 'bfd/elf32-xtensa.c')
| -rw-r--r-- | bfd/elf32-xtensa.c | 5845 |
1 files changed, 5845 insertions, 0 deletions
diff --git a/bfd/elf32-xtensa.c b/bfd/elf32-xtensa.c new file mode 100644 index 0000000..b991df4 --- /dev/null +++ b/bfd/elf32-xtensa.c @@ -0,0 +1,5845 @@ +/* Xtensa-specific support for 32-bit ELF. + Copyright 2003 Free Software Foundation, Inc. + + This file is part of BFD, the Binary File Descriptor library. + + This program is free software; you can redistribute it and/or + modify it under the terms of the GNU General Public License as + published by the Free Software Foundation; either version 2 of the + License, or (at your option) any later version. + + This program is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA + 02111-1307, USA. */ + +#include "bfd.h" +#include "sysdep.h" + +#ifdef ANSI_PROTOTYPES +#include <stdarg.h> +#else +#include <varargs.h> +#endif +#include <strings.h> + +#include "bfdlink.h" +#include "libbfd.h" +#include "elf-bfd.h" +#include "elf/xtensa.h" +#include "xtensa-isa.h" +#include "xtensa-config.h" + +/* Main interface functions. */ +static void elf_xtensa_info_to_howto_rela + PARAMS ((bfd *, arelent *, Elf_Internal_Rela *)); +static reloc_howto_type *elf_xtensa_reloc_type_lookup + PARAMS ((bfd *abfd, bfd_reloc_code_real_type code)); +extern int xtensa_read_table_entries + PARAMS ((bfd *, asection *, property_table_entry **, const char *)); +static bfd_boolean elf_xtensa_check_relocs + PARAMS ((bfd *, struct bfd_link_info *, asection *, + const Elf_Internal_Rela *)); +static void elf_xtensa_hide_symbol + PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean)); +static void elf_xtensa_copy_indirect_symbol + PARAMS ((struct elf_backend_data *, struct elf_link_hash_entry *, + struct elf_link_hash_entry *)); +static asection *elf_xtensa_gc_mark_hook + PARAMS ((asection *, struct bfd_link_info *, Elf_Internal_Rela *, + struct elf_link_hash_entry *, Elf_Internal_Sym *)); +static bfd_boolean elf_xtensa_gc_sweep_hook + PARAMS ((bfd *, struct bfd_link_info *, asection *, + const Elf_Internal_Rela *)); +static bfd_boolean elf_xtensa_create_dynamic_sections + PARAMS ((bfd *, struct bfd_link_info *)); +static bfd_boolean elf_xtensa_adjust_dynamic_symbol + PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); +static bfd_boolean elf_xtensa_size_dynamic_sections + PARAMS ((bfd *, struct bfd_link_info *)); +static bfd_boolean elf_xtensa_modify_segment_map + PARAMS ((bfd *)); +static bfd_boolean elf_xtensa_relocate_section + PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, + Elf_Internal_Rela *, Elf_Internal_Sym *, asection **)); +static bfd_boolean elf_xtensa_relax_section + PARAMS ((bfd *, asection *, struct bfd_link_info *, bfd_boolean *again)); +static bfd_boolean elf_xtensa_finish_dynamic_symbol + PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, + Elf_Internal_Sym *)); +static bfd_boolean elf_xtensa_finish_dynamic_sections + PARAMS ((bfd *, struct bfd_link_info *)); +static bfd_boolean elf_xtensa_merge_private_bfd_data + PARAMS ((bfd *, bfd *)); +static bfd_boolean elf_xtensa_set_private_flags + PARAMS ((bfd *, flagword)); +extern flagword elf_xtensa_get_private_bfd_flags + PARAMS ((bfd *)); +static bfd_boolean elf_xtensa_print_private_bfd_data + PARAMS ((bfd *, PTR)); +static bfd_boolean elf_xtensa_object_p + PARAMS ((bfd *)); +static void elf_xtensa_final_write_processing + PARAMS ((bfd *, bfd_boolean)); +static enum elf_reloc_type_class elf_xtensa_reloc_type_class + PARAMS ((const Elf_Internal_Rela *)); +static bfd_boolean elf_xtensa_discard_info + PARAMS ((bfd *, struct elf_reloc_cookie *, struct bfd_link_info *)); +static bfd_boolean elf_xtensa_ignore_discarded_relocs + PARAMS ((asection *)); +static bfd_boolean elf_xtensa_grok_prstatus + PARAMS ((bfd *, Elf_Internal_Note *)); +static bfd_boolean elf_xtensa_grok_psinfo + PARAMS ((bfd *, Elf_Internal_Note *)); +static bfd_boolean elf_xtensa_new_section_hook + PARAMS ((bfd *, asection *)); + + +/* Local helper functions. */ + +static int property_table_compare + PARAMS ((const PTR, const PTR)); +static bfd_boolean elf_xtensa_in_literal_pool + PARAMS ((property_table_entry *, int, bfd_vma)); +static void elf_xtensa_make_sym_local + PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); +static bfd_boolean add_extra_plt_sections + PARAMS ((bfd *, int)); +static bfd_boolean elf_xtensa_fix_refcounts + PARAMS ((struct elf_link_hash_entry *, PTR)); +static bfd_boolean elf_xtensa_allocate_plt_size + PARAMS ((struct elf_link_hash_entry *, PTR)); +static bfd_boolean elf_xtensa_allocate_got_size + PARAMS ((struct elf_link_hash_entry *, PTR)); +static void elf_xtensa_allocate_local_got_size + PARAMS ((struct bfd_link_info *, asection *)); +static bfd_reloc_status_type elf_xtensa_do_reloc + PARAMS ((reloc_howto_type *, bfd *, asection *, bfd_vma, bfd_byte *, + bfd_vma, bfd_boolean, char **)); +static char * vsprint_msg + VPARAMS ((const char *, const char *, int, ...)); +static char *build_encoding_error_message + PARAMS ((xtensa_opcode, xtensa_encode_result)); +static bfd_reloc_status_type bfd_elf_xtensa_reloc + PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); +static void do_fix_for_relocateable_link + PARAMS ((Elf_Internal_Rela *, bfd *, asection *)); +static void do_fix_for_final_link + PARAMS ((Elf_Internal_Rela *, asection *, bfd_vma *)); +static bfd_boolean xtensa_elf_dynamic_symbol_p + PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); +static bfd_vma elf_xtensa_create_plt_entry + PARAMS ((bfd *, bfd *, unsigned)); +static int elf_xtensa_combine_prop_entries + PARAMS ((bfd *, const char *)); +static bfd_boolean elf_xtensa_discard_info_for_section + PARAMS ((bfd *, struct elf_reloc_cookie *, struct bfd_link_info *, + asection *)); + +/* Local functions to handle Xtensa configurability. */ + +static void init_call_opcodes + PARAMS ((void)); +static bfd_boolean is_indirect_call_opcode + PARAMS ((xtensa_opcode)); +static bfd_boolean is_direct_call_opcode + PARAMS ((xtensa_opcode)); +static bfd_boolean is_windowed_call_opcode + PARAMS ((xtensa_opcode)); +static xtensa_opcode get_l32r_opcode + PARAMS ((void)); +static bfd_vma l32r_offset + PARAMS ((bfd_vma, bfd_vma)); +static int get_relocation_opnd + PARAMS ((Elf_Internal_Rela *)); +static xtensa_opcode get_relocation_opcode + PARAMS ((asection *, bfd_byte *, Elf_Internal_Rela *)); +static bfd_boolean is_l32r_relocation + PARAMS ((asection *, bfd_byte *, Elf_Internal_Rela *)); + +/* Functions for link-time code simplifications. */ + +static bfd_reloc_status_type elf_xtensa_do_asm_simplify + PARAMS ((bfd_byte *, bfd_vma, bfd_vma)); +static bfd_reloc_status_type contract_asm_expansion + PARAMS ((bfd_byte *, bfd_vma, Elf_Internal_Rela *)); +static xtensa_opcode swap_callx_for_call_opcode + PARAMS ((xtensa_opcode)); +static xtensa_opcode get_expanded_call_opcode + PARAMS ((bfd_byte *, int)); + +/* Access to internal relocations, section contents and symbols. */ + +static Elf_Internal_Rela *retrieve_internal_relocs + PARAMS ((bfd *, asection *, bfd_boolean)); +static void pin_internal_relocs + PARAMS ((asection *, Elf_Internal_Rela *)); +static void release_internal_relocs + PARAMS ((asection *, Elf_Internal_Rela *)); +static bfd_byte *retrieve_contents + PARAMS ((bfd *, asection *, bfd_boolean)); +static void pin_contents + PARAMS ((asection *, bfd_byte *)); +static void release_contents + PARAMS ((asection *, bfd_byte *)); +static Elf_Internal_Sym *retrieve_local_syms + PARAMS ((bfd *)); + +/* Miscellaneous utility functions. */ + +static asection *elf_xtensa_get_plt_section + PARAMS ((bfd *, int)); +static asection *elf_xtensa_get_gotplt_section + PARAMS ((bfd *, int)); +static asection *get_elf_r_symndx_section + PARAMS ((bfd *, unsigned long)); +static struct elf_link_hash_entry *get_elf_r_symndx_hash_entry + PARAMS ((bfd *, unsigned long)); +static bfd_vma get_elf_r_symndx_offset + PARAMS ((bfd *, unsigned long)); +static bfd_boolean pcrel_reloc_fits + PARAMS ((xtensa_operand, bfd_vma, bfd_vma)); +static bfd_boolean xtensa_is_property_section + PARAMS ((asection *)); +static bfd_boolean is_literal_section + PARAMS ((asection *)); +static int internal_reloc_compare + PARAMS ((const PTR, const PTR)); +static bfd_boolean get_is_linkonce_section + PARAMS ((bfd *, asection *)); +extern char *xtensa_get_property_section_name + PARAMS ((bfd *, asection *, const char *)); + +/* Other functions called directly by the linker. */ + +typedef void (*deps_callback_t) + PARAMS ((asection *, bfd_vma, asection *, bfd_vma, PTR)); +extern bfd_boolean xtensa_callback_required_dependence + PARAMS ((bfd *, asection *, struct bfd_link_info *, + deps_callback_t, PTR)); + + +typedef struct xtensa_relax_info_struct xtensa_relax_info; + + +/* Total count of PLT relocations seen during check_relocs. + The actual PLT code must be split into multiple sections and all + the sections have to be created before size_dynamic_sections, + where we figure out the exact number of PLT entries that will be + needed. It is OK is this count is an overestimate, e.g., some + relocations may be removed by GC. */ + +static int plt_reloc_count = 0; + + +/* When this is true, relocations may have been modified to refer to + symbols from other input files. The per-section list of "fix" + records needs to be checked when resolving relocations. */ + +static bfd_boolean relaxing_section = FALSE; + + +static reloc_howto_type elf_howto_table[] = +{ + HOWTO (R_XTENSA_NONE, 0, 0, 0, FALSE, 0, complain_overflow_dont, + bfd_elf_xtensa_reloc, "R_XTENSA_NONE", + FALSE, 0x00000000, 0x00000000, FALSE), + HOWTO (R_XTENSA_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, + bfd_elf_xtensa_reloc, "R_XTENSA_32", + TRUE, 0xffffffff, 0xffffffff, FALSE), + /* Replace a 32-bit value with a value from the runtime linker (only + used by linker-generated stub functions). The r_addend value is + special: 1 means to substitute a pointer to the runtime linker's + dynamic resolver function; 2 means to substitute the link map for + the shared object. */ + HOWTO (R_XTENSA_RTLD, 0, 2, 32, FALSE, 0, complain_overflow_dont, + NULL, "R_XTENSA_RTLD", + FALSE, 0x00000000, 0x00000000, FALSE), + HOWTO (R_XTENSA_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, + bfd_elf_generic_reloc, "R_XTENSA_GLOB_DAT", + FALSE, 0xffffffff, 0xffffffff, FALSE), + HOWTO (R_XTENSA_JMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, + bfd_elf_generic_reloc, "R_XTENSA_JMP_SLOT", + FALSE, 0xffffffff, 0xffffffff, FALSE), + HOWTO (R_XTENSA_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, + bfd_elf_generic_reloc, "R_XTENSA_RELATIVE", + FALSE, 0xffffffff, 0xffffffff, FALSE), + HOWTO (R_XTENSA_PLT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, + bfd_elf_xtensa_reloc, "R_XTENSA_PLT", + FALSE, 0xffffffff, 0xffffffff, FALSE), + EMPTY_HOWTO (7), + HOWTO (R_XTENSA_OP0, 0, 0, 0, TRUE, 0, complain_overflow_dont, + bfd_elf_xtensa_reloc, "R_XTENSA_OP0", + FALSE, 0x00000000, 0x00000000, TRUE), + HOWTO (R_XTENSA_OP1, 0, 0, 0, TRUE, 0, complain_overflow_dont, + bfd_elf_xtensa_reloc, "R_XTENSA_OP1", + FALSE, 0x00000000, 0x00000000, TRUE), + HOWTO (R_XTENSA_OP2, 0, 0, 0, TRUE, 0, complain_overflow_dont, + bfd_elf_xtensa_reloc, "R_XTENSA_OP2", + FALSE, 0x00000000, 0x00000000, TRUE), + /* Assembly auto-expansion. */ + HOWTO (R_XTENSA_ASM_EXPAND, 0, 0, 0, TRUE, 0, complain_overflow_dont, + bfd_elf_xtensa_reloc, "R_XTENSA_ASM_EXPAND", + FALSE, 0x00000000, 0x00000000, FALSE), + /* Relax assembly auto-expansion. */ + HOWTO (R_XTENSA_ASM_SIMPLIFY, 0, 0, 0, TRUE, 0, complain_overflow_dont, + bfd_elf_xtensa_reloc, "R_XTENSA_ASM_SIMPLIFY", + FALSE, 0x00000000, 0x00000000, TRUE), + EMPTY_HOWTO (13), + EMPTY_HOWTO (14), + /* GNU extension to record C++ vtable hierarchy. */ + HOWTO (R_XTENSA_GNU_VTINHERIT, 0, 2, 0, FALSE, 0, complain_overflow_dont, + NULL, "R_XTENSA_GNU_VTINHERIT", + FALSE, 0x00000000, 0x00000000, FALSE), + /* GNU extension to record C++ vtable member usage. */ + HOWTO (R_XTENSA_GNU_VTENTRY, 0, 2, 0, FALSE, 0, complain_overflow_dont, + _bfd_elf_rel_vtable_reloc_fn, "R_XTENSA_GNU_VTENTRY", + FALSE, 0x00000000, 0x00000000, FALSE) +}; + +#ifdef DEBUG_GEN_RELOC +#define TRACE(str) \ + fprintf (stderr, "Xtensa bfd reloc lookup %d (%s)\n", code, str) +#else +#define TRACE(str) +#endif + +static reloc_howto_type * +elf_xtensa_reloc_type_lookup (abfd, code) + bfd *abfd ATTRIBUTE_UNUSED; + bfd_reloc_code_real_type code; +{ + switch (code) + { + case BFD_RELOC_NONE: + TRACE ("BFD_RELOC_NONE"); + return &elf_howto_table[(unsigned) R_XTENSA_NONE ]; + + case BFD_RELOC_32: + TRACE ("BFD_RELOC_32"); + return &elf_howto_table[(unsigned) R_XTENSA_32 ]; + + case BFD_RELOC_XTENSA_RTLD: + TRACE ("BFD_RELOC_XTENSA_RTLD"); + return &elf_howto_table[(unsigned) R_XTENSA_RTLD ]; + + case BFD_RELOC_XTENSA_GLOB_DAT: + TRACE ("BFD_RELOC_XTENSA_GLOB_DAT"); + return &elf_howto_table[(unsigned) R_XTENSA_GLOB_DAT ]; + + case BFD_RELOC_XTENSA_JMP_SLOT: + TRACE ("BFD_RELOC_XTENSA_JMP_SLOT"); + return &elf_howto_table[(unsigned) R_XTENSA_JMP_SLOT ]; + + case BFD_RELOC_XTENSA_RELATIVE: + TRACE ("BFD_RELOC_XTENSA_RELATIVE"); + return &elf_howto_table[(unsigned) R_XTENSA_RELATIVE ]; + + case BFD_RELOC_XTENSA_PLT: + TRACE ("BFD_RELOC_XTENSA_PLT"); + return &elf_howto_table[(unsigned) R_XTENSA_PLT ]; + + case BFD_RELOC_XTENSA_OP0: + TRACE ("BFD_RELOC_XTENSA_OP0"); + return &elf_howto_table[(unsigned) R_XTENSA_OP0 ]; + + case BFD_RELOC_XTENSA_OP1: + TRACE ("BFD_RELOC_XTENSA_OP1"); + return &elf_howto_table[(unsigned) R_XTENSA_OP1 ]; + + case BFD_RELOC_XTENSA_OP2: + TRACE ("BFD_RELOC_XTENSA_OP2"); + return &elf_howto_table[(unsigned) R_XTENSA_OP2 ]; + + case BFD_RELOC_XTENSA_ASM_EXPAND: + TRACE ("BFD_RELOC_XTENSA_ASM_EXPAND"); + return &elf_howto_table[(unsigned) R_XTENSA_ASM_EXPAND ]; + + case BFD_RELOC_XTENSA_ASM_SIMPLIFY: + TRACE ("BFD_RELOC_XTENSA_ASM_SIMPLIFY"); + return &elf_howto_table[(unsigned) R_XTENSA_ASM_SIMPLIFY ]; + + case BFD_RELOC_VTABLE_INHERIT: + TRACE ("BFD_RELOC_VTABLE_INHERIT"); + return &elf_howto_table[(unsigned) R_XTENSA_GNU_VTINHERIT ]; + + case BFD_RELOC_VTABLE_ENTRY: + TRACE ("BFD_RELOC_VTABLE_ENTRY"); + return &elf_howto_table[(unsigned) R_XTENSA_GNU_VTENTRY ]; + + default: + break; + } + + TRACE ("Unknown"); + return NULL; +} + + +/* Given an ELF "rela" relocation, find the corresponding howto and record + it in the BFD internal arelent representation of the relocation. */ + +static void +elf_xtensa_info_to_howto_rela (abfd, cache_ptr, dst) + bfd *abfd ATTRIBUTE_UNUSED; + arelent *cache_ptr; + Elf_Internal_Rela *dst; +{ + unsigned int r_type = ELF32_R_TYPE (dst->r_info); + + BFD_ASSERT (r_type < (unsigned int) R_XTENSA_max); + cache_ptr->howto = &elf_howto_table[r_type]; +} + + +/* Functions for the Xtensa ELF linker. */ + +/* The name of the dynamic interpreter. This is put in the .interp + section. */ + +#define ELF_DYNAMIC_INTERPRETER "/lib/ld.so" + +/* The size in bytes of an entry in the procedure linkage table. + (This does _not_ include the space for the literals associated with + the PLT entry.) */ + +#define PLT_ENTRY_SIZE 16 + +/* For _really_ large PLTs, we may need to alternate between literals + and code to keep the literals within the 256K range of the L32R + instructions in the code. It's unlikely that anyone would ever need + such a big PLT, but an arbitrary limit on the PLT size would be bad. + Thus, we split the PLT into chunks. Since there's very little + overhead (2 extra literals) for each chunk, the chunk size is kept + small so that the code for handling multiple chunks get used and + tested regularly. With 254 entries, there are 1K of literals for + each chunk, and that seems like a nice round number. */ + +#define PLT_ENTRIES_PER_CHUNK 254 + +/* PLT entries are actually used as stub functions for lazy symbol + resolution. Once the symbol is resolved, the stub function is never + invoked. Note: the 32-byte frame size used here cannot be changed + without a corresponding change in the runtime linker. */ + +static const bfd_byte elf_xtensa_be_plt_entry[PLT_ENTRY_SIZE] = +{ + 0x6c, 0x10, 0x04, /* entry sp, 32 */ + 0x18, 0x00, 0x00, /* l32r a8, [got entry for rtld's resolver] */ + 0x1a, 0x00, 0x00, /* l32r a10, [got entry for rtld's link map] */ + 0x1b, 0x00, 0x00, /* l32r a11, [literal for reloc index] */ + 0x0a, 0x80, 0x00, /* jx a8 */ + 0 /* unused */ +}; + +static const bfd_byte elf_xtensa_le_plt_entry[PLT_ENTRY_SIZE] = +{ + 0x36, 0x41, 0x00, /* entry sp, 32 */ + 0x81, 0x00, 0x00, /* l32r a8, [got entry for rtld's resolver] */ + 0xa1, 0x00, 0x00, /* l32r a10, [got entry for rtld's link map] */ + 0xb1, 0x00, 0x00, /* l32r a11, [literal for reloc index] */ + 0xa0, 0x08, 0x00, /* jx a8 */ + 0 /* unused */ +}; + + +static int +property_table_compare (ap, bp) + const PTR ap; + const PTR bp; +{ + const property_table_entry *a = (const property_table_entry *) ap; + const property_table_entry *b = (const property_table_entry *) bp; + + /* Check if one entry overlaps with the other; this shouldn't happen + except when searching for a match. */ + if ((b->address >= a->address && b->address < (a->address + a->size)) + || (a->address >= b->address && a->address < (b->address + b->size))) + return 0; + + return (a->address - b->address); +} + + +/* Get the literal table or instruction table entries for the given + section. Sets TABLE_P and returns the number of entries. On error, + returns a negative value. */ + +int +xtensa_read_table_entries (abfd, section, table_p, sec_name) + bfd *abfd; + asection *section; + property_table_entry **table_p; + const char *sec_name; +{ + asection *table_section; + char *table_section_name; + bfd_size_type table_size = 0; + bfd_byte *table_data; + property_table_entry *blocks; + int block_count; + bfd_size_type num_records; + Elf_Internal_Rela *internal_relocs; + + table_section_name = + xtensa_get_property_section_name (abfd, section, sec_name); + table_section = bfd_get_section_by_name (abfd, table_section_name); + if (table_section != NULL) + table_size = bfd_get_section_size_before_reloc (table_section); + + if (table_size == 0) + { + *table_p = NULL; + return 0; + } + + num_records = table_size / sizeof (property_table_entry); + table_data = retrieve_contents (abfd, table_section, TRUE); + blocks = (property_table_entry *) + bfd_malloc (num_records * sizeof (property_table_entry)); + block_count = 0; + + /* If the file has not yet been relocated, process the relocations + and sort out the table entries that apply to the specified section. */ + internal_relocs = retrieve_internal_relocs (abfd, table_section, TRUE); + if (internal_relocs) + { + unsigned i; + + for (i = 0; i < table_section->reloc_count; i++) + { + Elf_Internal_Rela *rel = &internal_relocs[i]; + unsigned long r_symndx; + + if (ELF32_R_TYPE (rel->r_info) == R_XTENSA_NONE) + continue; + + BFD_ASSERT (ELF32_R_TYPE (rel->r_info) == R_XTENSA_32); + r_symndx = ELF32_R_SYM (rel->r_info); + + if (get_elf_r_symndx_section (abfd, r_symndx) == section) + { + bfd_vma sym_off = get_elf_r_symndx_offset (abfd, r_symndx); + blocks[block_count].address = + (section->vma + sym_off + rel->r_addend + + bfd_get_32 (abfd, table_data + rel->r_offset)); + blocks[block_count].size = + bfd_get_32 (abfd, table_data + rel->r_offset + 4); + block_count++; + } + } + } + else + { + /* No relocations. Presumably the file has been relocated + and the addresses are already in the table. */ + bfd_vma off; + + for (off = 0; off < table_size; off += sizeof (property_table_entry)) + { + bfd_vma address = bfd_get_32 (abfd, table_data + off); + + if (address >= section->vma + && address < ( section->vma + section->_raw_size)) + { + blocks[block_count].address = address; + blocks[block_count].size = + bfd_get_32 (abfd, table_data + off + 4); + block_count++; + } + } + } + + release_contents (table_section, table_data); + release_internal_relocs (table_section, internal_relocs); + + if (block_count > 0) + { + /* Now sort them into address order for easy reference. */ + qsort (blocks, block_count, sizeof (property_table_entry), + property_table_compare); + } + + *table_p = blocks; + return block_count; +} + + +static bfd_boolean +elf_xtensa_in_literal_pool (lit_table, lit_table_size, addr) + property_table_entry *lit_table; + int lit_table_size; + bfd_vma addr; +{ + property_table_entry entry; + + if (lit_table_size == 0) + return FALSE; + + entry.address = addr; + entry.size = 1; + + if (bsearch (&entry, lit_table, lit_table_size, + sizeof (property_table_entry), property_table_compare)) + return TRUE; + + return FALSE; +} + + +/* Look through the relocs for a section during the first phase, and + calculate needed space in the dynamic reloc sections. */ + +static bfd_boolean +elf_xtensa_check_relocs (abfd, info, sec, relocs) + bfd *abfd; + struct bfd_link_info *info; + asection *sec; + const Elf_Internal_Rela *relocs; +{ + Elf_Internal_Shdr *symtab_hdr; + struct elf_link_hash_entry **sym_hashes; + const Elf_Internal_Rela *rel; + const Elf_Internal_Rela *rel_end; + property_table_entry *lit_table; + int ltblsize; + + if (info->relocateable) + return TRUE; + + symtab_hdr = &elf_tdata (abfd)->symtab_hdr; + sym_hashes = elf_sym_hashes (abfd); + + ltblsize = xtensa_read_table_entries (abfd, sec, &lit_table, + XTENSA_LIT_SEC_NAME); + if (ltblsize < 0) + return FALSE; + + rel_end = relocs + sec->reloc_count; + for (rel = relocs; rel < rel_end; rel++) + { + unsigned int r_type; + unsigned long r_symndx; + struct elf_link_hash_entry *h; + + r_symndx = ELF32_R_SYM (rel->r_info); + r_type = ELF32_R_TYPE (rel->r_info); + + if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr)) + { + (*_bfd_error_handler) (_("%s: bad symbol index: %d"), + bfd_archive_filename (abfd), + r_symndx); + return FALSE; + } + + if (r_symndx < symtab_hdr->sh_info) + h = NULL; + else + { + h = sym_hashes[r_symndx - symtab_hdr->sh_info]; + while (h->root.type == bfd_link_hash_indirect + || h->root.type == bfd_link_hash_warning) + h = (struct elf_link_hash_entry *) h->root.u.i.link; + } + + switch (r_type) + { + case R_XTENSA_32: + if (h == NULL) + goto local_literal; + + if ((sec->flags & SEC_ALLOC) != 0) + { + if ((sec->flags & SEC_READONLY) != 0 + && !elf_xtensa_in_literal_pool (lit_table, ltblsize, + sec->vma + rel->r_offset)) + h->elf_link_hash_flags |= ELF_LINK_NON_GOT_REF; + + if (h->got.refcount <= 0) + h->got.refcount = 1; + else + h->got.refcount += 1; + } + break; + + case R_XTENSA_PLT: + /* If this relocation is against a local symbol, then it's + exactly the same as a normal local GOT entry. */ + if (h == NULL) + goto local_literal; + + if ((sec->flags & SEC_ALLOC) != 0) + { + if ((sec->flags & SEC_READONLY) != 0 + && !elf_xtensa_in_literal_pool (lit_table, ltblsize, + sec->vma + rel->r_offset)) + h->elf_link_hash_flags |= ELF_LINK_NON_GOT_REF; + + if (h->plt.refcount <= 0) + { + h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT; + h->plt.refcount = 1; + } + else + h->plt.refcount += 1; + + /* Keep track of the total PLT relocation count even if we + don't yet know whether the dynamic sections will be + created. */ + plt_reloc_count += 1; + + if (elf_hash_table (info)->dynamic_sections_created) + { + if (!add_extra_plt_sections (elf_hash_table (info)->dynobj, + plt_reloc_count)) + return FALSE; + } + } + break; + + local_literal: + if ((sec->flags & SEC_ALLOC) != 0) + { + bfd_signed_vma *local_got_refcounts; + + /* This is a global offset table entry for a local symbol. */ + local_got_refcounts = elf_local_got_refcounts (abfd); + if (local_got_refcounts == NULL) + { + bfd_size_type size; + + size = symtab_hdr->sh_info; + size *= sizeof (bfd_signed_vma); + local_got_refcounts = ((bfd_signed_vma *) + bfd_zalloc (abfd, size)); + if (local_got_refcounts == NULL) + return FALSE; + elf_local_got_refcounts (abfd) = local_got_refcounts; + } + local_got_refcounts[r_symndx] += 1; + + /* If the relocation is not inside the GOT, the DF_TEXTREL + flag needs to be set. */ + if (info->shared + && (sec->flags & SEC_READONLY) != 0 + && !elf_xtensa_in_literal_pool (lit_table, ltblsize, + sec->vma + rel->r_offset)) + info->flags |= DF_TEXTREL; + } + break; + + case R_XTENSA_OP0: + case R_XTENSA_OP1: + case R_XTENSA_OP2: + case R_XTENSA_ASM_EXPAND: + case R_XTENSA_ASM_SIMPLIFY: + /* Nothing to do for these. */ + break; + + case R_XTENSA_GNU_VTINHERIT: + /* This relocation describes the C++ object vtable hierarchy. + Reconstruct it for later use during GC. */ + if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) + return FALSE; + break; + + case R_XTENSA_GNU_VTENTRY: + /* This relocation describes which C++ vtable entries are actually + used. Record for later use during GC. */ + if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend)) + return FALSE; + break; + + default: + break; + } + } + + free (lit_table); + return TRUE; +} + + +static void +elf_xtensa_hide_symbol (info, h, force_local) + struct bfd_link_info *info; + struct elf_link_hash_entry *h; + bfd_boolean force_local; +{ + /* For a shared link, move the plt refcount to the got refcount to leave + space for RELATIVE relocs. */ + elf_xtensa_make_sym_local (info, h); + + _bfd_elf_link_hash_hide_symbol (info, h, force_local); +} + + +static void +elf_xtensa_copy_indirect_symbol (bed, dir, ind) + struct elf_backend_data *bed; + struct elf_link_hash_entry *dir, *ind; +{ + _bfd_elf_link_hash_copy_indirect (bed, dir, ind); + + /* The standard function doesn't copy the NEEDS_PLT flag. */ + dir->elf_link_hash_flags |= + (ind->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT); +} + + +/* Return the section that should be marked against GC for a given + relocation. */ + +static asection * +elf_xtensa_gc_mark_hook (sec, info, rel, h, sym) + asection *sec; + struct bfd_link_info *info ATTRIBUTE_UNUSED; + Elf_Internal_Rela *rel; + struct elf_link_hash_entry *h; + Elf_Internal_Sym *sym; +{ + if (h != NULL) + { + switch (ELF32_R_TYPE (rel->r_info)) + { + case R_XTENSA_GNU_VTINHERIT: + case R_XTENSA_GNU_VTENTRY: + break; + + default: + switch (h->root.type) + { + case bfd_link_hash_defined: + case bfd_link_hash_defweak: + return h->root.u.def.section; + + case bfd_link_hash_common: + return h->root.u.c.p->section; + + default: + break; + } + } + } + else + return bfd_section_from_elf_index (sec->owner, sym->st_shndx); + + return NULL; +} + +/* Update the GOT & PLT entry reference counts + for the section being removed. */ + +static bfd_boolean +elf_xtensa_gc_sweep_hook (abfd, info, sec, relocs) + bfd *abfd; + struct bfd_link_info *info ATTRIBUTE_UNUSED; + asection *sec; + const Elf_Internal_Rela *relocs; +{ + Elf_Internal_Shdr *symtab_hdr; + struct elf_link_hash_entry **sym_hashes; + bfd_signed_vma *local_got_refcounts; + const Elf_Internal_Rela *rel, *relend; + + if ((sec->flags & SEC_ALLOC) == 0) + return TRUE; + + symtab_hdr = &elf_tdata (abfd)->symtab_hdr; + sym_hashes = elf_sym_hashes (abfd); + local_got_refcounts = elf_local_got_refcounts (abfd); + + relend = relocs + sec->reloc_count; + for (rel = relocs; rel < relend; rel++) + { + unsigned long r_symndx; + unsigned int r_type; + struct elf_link_hash_entry *h = NULL; + + r_symndx = ELF32_R_SYM (rel->r_info); + if (r_symndx >= symtab_hdr->sh_info) + h = sym_hashes[r_symndx - symtab_hdr->sh_info]; + + r_type = ELF32_R_TYPE (rel->r_info); + switch (r_type) + { + case R_XTENSA_32: + if (h == NULL) + goto local_literal; + if (h->got.refcount > 0) + h->got.refcount--; + break; + + case R_XTENSA_PLT: + if (h == NULL) + goto local_literal; + if (h->plt.refcount > 0) + h->plt.refcount--; + break; + + local_literal: + if (local_got_refcounts[r_symndx] > 0) + local_got_refcounts[r_symndx] -= 1; + break; + + default: + break; + } + } + + return TRUE; +} + + +/* Create all the dynamic sections. */ + +static bfd_boolean +elf_xtensa_create_dynamic_sections (dynobj, info) + bfd *dynobj; + struct bfd_link_info *info; +{ + flagword flags; + asection *s; + + /* First do all the standard stuff. */ + if (! _bfd_elf_create_dynamic_sections (dynobj, info)) + return FALSE; + + /* Create any extra PLT sections in case check_relocs has already + been called on all the non-dynamic input files. */ + if (!add_extra_plt_sections (dynobj, plt_reloc_count)) + return FALSE; + + flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY + | SEC_LINKER_CREATED | SEC_READONLY); + + /* Mark the ".got.plt" section READONLY. */ + s = bfd_get_section_by_name (dynobj, ".got.plt"); + if (s == NULL + || ! bfd_set_section_flags (dynobj, s, flags)) + return FALSE; + + /* Create ".rela.got". */ + s = bfd_make_section (dynobj, ".rela.got"); + if (s == NULL + || ! bfd_set_section_flags (dynobj, s, flags) + || ! bfd_set_section_alignment (dynobj, s, 2)) + return FALSE; + + /* Create ".xt.lit.plt" (literal table for ".got.plt*"). */ + s = bfd_make_section (dynobj, ".xt.lit.plt"); + if (s == NULL + || ! bfd_set_section_flags (dynobj, s, flags) + || ! bfd_set_section_alignment (dynobj, s, 2)) + return FALSE; + + return TRUE; +} + + +static bfd_boolean +add_extra_plt_sections (dynobj, count) + bfd *dynobj; + int count; +{ + int chunk; + + /* Iterate over all chunks except 0 which uses the standard ".plt" and + ".got.plt" sections. */ + for (chunk = count / PLT_ENTRIES_PER_CHUNK; chunk > 0; chunk--) + { + char *sname; + flagword flags; + asection *s; + + /* Stop when we find a section has already been created. */ + if (elf_xtensa_get_plt_section (dynobj, chunk)) + break; + + flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY + | SEC_LINKER_CREATED | SEC_READONLY); + + sname = (char *) bfd_malloc (10); + sprintf (sname, ".plt.%u", chunk); + s = bfd_make_section (dynobj, sname); + if (s == NULL + || ! bfd_set_section_flags (dynobj, s, flags | SEC_CODE) + || ! bfd_set_section_alignment (dynobj, s, 2)) + return FALSE; + + sname = (char *) bfd_malloc (14); + sprintf (sname, ".got.plt.%u", chunk); + s = bfd_make_section (dynobj, sname); + if (s == NULL + || ! bfd_set_section_flags (dynobj, s, flags) + || ! bfd_set_section_alignment (dynobj, s, 2)) + return FALSE; + } + + return TRUE; +} + + +/* Adjust a symbol defined by a dynamic object and referenced by a + regular object. The current definition is in some section of the + dynamic object, but we're not including those sections. We have to + change the definition to something the rest of the link can + understand. */ + +static bfd_boolean +elf_xtensa_adjust_dynamic_symbol (info, h) + struct bfd_link_info *info ATTRIBUTE_UNUSED; + struct elf_link_hash_entry *h; +{ + /* If this is a weak symbol, and there is a real definition, the + processor independent code will have arranged for us to see the + real definition first, and we can just use the same value. */ + if (h->weakdef != NULL) + { + BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined + || h->weakdef->root.type == bfd_link_hash_defweak); + h->root.u.def.section = h->weakdef->root.u.def.section; + h->root.u.def.value = h->weakdef->root.u.def.value; + return TRUE; + } + + /* This is a reference to a symbol defined by a dynamic object. The + reference must go through the GOT, so there's no need for COPY relocs, + .dynbss, etc. */ + + return TRUE; +} + + +static void +elf_xtensa_make_sym_local (info, h) + struct bfd_link_info *info; + struct elf_link_hash_entry *h; +{ + if (info->shared) + { + if (h->plt.refcount > 0) + { + /* Will use RELATIVE relocs instead of JMP_SLOT relocs. */ + if (h->got.refcount < 0) + h->got.refcount = 0; + h->got.refcount += h->plt.refcount; + h->plt.refcount = 0; + } + } + else + { + /* Don't need any dynamic relocations at all. */ + h->elf_link_hash_flags &= ~ELF_LINK_NON_GOT_REF; + h->plt.refcount = 0; + h->got.refcount = 0; + } +} + + +static bfd_boolean +elf_xtensa_fix_refcounts (h, arg) + struct elf_link_hash_entry *h; + PTR arg; +{ + struct bfd_link_info *info = (struct bfd_link_info *) arg; + + if (h->root.type == bfd_link_hash_warning) + h = (struct elf_link_hash_entry *) h->root.u.i.link; + + if (! xtensa_elf_dynamic_symbol_p (info, h)) + elf_xtensa_make_sym_local (info, h); + + /* If the symbol has a relocation outside the GOT, set the + DF_TEXTREL flag. */ + if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) != 0) + info->flags |= DF_TEXTREL; + + return TRUE; +} + + +static bfd_boolean +elf_xtensa_allocate_plt_size (h, arg) + struct elf_link_hash_entry *h; + PTR arg; +{ + asection *srelplt = (asection *) arg; + + if (h->root.type == bfd_link_hash_warning) + h = (struct elf_link_hash_entry *) h->root.u.i.link; + + if (h->plt.refcount > 0) + srelplt->_raw_size += (h->plt.refcount * sizeof (Elf32_External_Rela)); + + return TRUE; +} + + +static bfd_boolean +elf_xtensa_allocate_got_size (h, arg) + struct elf_link_hash_entry *h; + PTR arg; +{ + asection *srelgot = (asection *) arg; + + if (h->root.type == bfd_link_hash_warning) + h = (struct elf_link_hash_entry *) h->root.u.i.link; + + if (h->got.refcount > 0) + srelgot->_raw_size += (h->got.refcount * sizeof (Elf32_External_Rela)); + + return TRUE; +} + + +static void +elf_xtensa_allocate_local_got_size (info, srelgot) + struct bfd_link_info *info; + asection *srelgot; +{ + bfd *i; + + for (i = info->input_bfds; i; i = i->link_next) + { + bfd_signed_vma *local_got_refcounts; + bfd_size_type j, cnt; + Elf_Internal_Shdr *symtab_hdr; + + local_got_refcounts = elf_local_got_refcounts (i); + if (!local_got_refcounts) + continue; + + symtab_hdr = &elf_tdata (i)->symtab_hdr; + cnt = symtab_hdr->sh_info; + + for (j = 0; j < cnt; ++j) + { + if (local_got_refcounts[j] > 0) + srelgot->_raw_size += (local_got_refcounts[j] + * sizeof (Elf32_External_Rela)); + } + } +} + + +/* Set the sizes of the dynamic sections. */ + +static bfd_boolean +elf_xtensa_size_dynamic_sections (output_bfd, info) + bfd *output_bfd ATTRIBUTE_UNUSED; + struct bfd_link_info *info; +{ + bfd *dynobj; + asection *s, *srelplt, *splt, *sgotplt, *srelgot, *spltlittbl; + bfd_boolean relplt, relgot; + int plt_entries, plt_chunks, chunk; + + plt_entries = 0; + plt_chunks = 0; + srelgot = 0; + + dynobj = elf_hash_table (info)->dynobj; + if (dynobj == NULL) + abort (); + + if (elf_hash_table (info)->dynamic_sections_created) + { + /* Set the contents of the .interp section to the interpreter. */ + if (! info->shared) + { + s = bfd_get_section_by_name (dynobj, ".interp"); + if (s == NULL) + abort (); + s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER; + s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; + } + + /* Allocate room for one word in ".got". */ + s = bfd_get_section_by_name (dynobj, ".got"); + if (s == NULL) + abort (); + s->_raw_size = 4; + + /* Adjust refcounts for symbols that we now know are not "dynamic". */ + elf_link_hash_traverse (elf_hash_table (info), + elf_xtensa_fix_refcounts, + (PTR) info); + + /* Allocate space in ".rela.got" for literals that reference + global symbols. */ + srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); + if (srelgot == NULL) + abort (); + elf_link_hash_traverse (elf_hash_table (info), + elf_xtensa_allocate_got_size, + (PTR) srelgot); + + /* If we are generating a shared object, we also need space in + ".rela.got" for R_XTENSA_RELATIVE relocs for literals that + reference local symbols. */ + if (info->shared) + elf_xtensa_allocate_local_got_size (info, srelgot); + + /* Allocate space in ".rela.plt" for literals that have PLT entries. */ + srelplt = bfd_get_section_by_name (dynobj, ".rela.plt"); + if (srelplt == NULL) + abort (); + elf_link_hash_traverse (elf_hash_table (info), + elf_xtensa_allocate_plt_size, + (PTR) srelplt); + + /* Allocate space in ".plt" to match the size of ".rela.plt". For + each PLT entry, we need the PLT code plus a 4-byte literal. + For each chunk of ".plt", we also need two more 4-byte + literals, two corresponding entries in ".rela.got", and an + 8-byte entry in ".xt.lit.plt". */ + spltlittbl = bfd_get_section_by_name (dynobj, ".xt.lit.plt"); + if (spltlittbl == NULL) + abort (); + + plt_entries = srelplt->_raw_size / sizeof (Elf32_External_Rela); + plt_chunks = + (plt_entries + PLT_ENTRIES_PER_CHUNK - 1) / PLT_ENTRIES_PER_CHUNK; + + /* Iterate over all the PLT chunks, including any extra sections + created earlier because the initial count of PLT relocations + was an overestimate. */ + for (chunk = 0; + (splt = elf_xtensa_get_plt_section (dynobj, chunk)) != NULL; + chunk++) + { + int chunk_entries; + + sgotplt = elf_xtensa_get_gotplt_section (dynobj, chunk); + if (sgotplt == NULL) + abort (); + + if (chunk < plt_chunks - 1) + chunk_entries = PLT_ENTRIES_PER_CHUNK; + else if (chunk == plt_chunks - 1) + chunk_entries = plt_entries - (chunk * PLT_ENTRIES_PER_CHUNK); + else + chunk_entries = 0; + + if (chunk_entries != 0) + { + sgotplt->_raw_size = 4 * (chunk_entries + 2); + splt->_raw_size = PLT_ENTRY_SIZE * chunk_entries; + srelgot->_raw_size += 2 * sizeof (Elf32_External_Rela); + spltlittbl->_raw_size += 8; + } + else + { + sgotplt->_raw_size = 0; + splt->_raw_size = 0; + } + } + } + + /* Allocate memory for dynamic sections. */ + relplt = FALSE; + relgot = FALSE; + for (s = dynobj->sections; s != NULL; s = s->next) + { + const char *name; + bfd_boolean strip; + + if ((s->flags & SEC_LINKER_CREATED) == 0) + continue; + + /* It's OK to base decisions on the section name, because none + of the dynobj section names depend upon the input files. */ + name = bfd_get_section_name (dynobj, s); + + strip = FALSE; + + if (strncmp (name, ".rela", 5) == 0) + { + if (strcmp (name, ".rela.plt") == 0) + relplt = TRUE; + else if (strcmp (name, ".rela.got") == 0) + relgot = TRUE; + + /* We use the reloc_count field as a counter if we need + to copy relocs into the output file. */ + s->reloc_count = 0; + } + else if (strncmp (name, ".plt.", 5) == 0 + || strncmp (name, ".got.plt.", 9) == 0) + { + if (s->_raw_size == 0) + { + /* If we don't need this section, strip it from the output + file. We must create the ".plt*" and ".got.plt*" + sections in create_dynamic_sections and/or check_relocs + based on a conservative estimate of the PLT relocation + count, because the sections must be created before the + linker maps input sections to output sections. The + linker does that before size_dynamic_sections, where we + compute the exact size of the PLT, so there may be more + of these sections than are actually needed. */ + strip = TRUE; + } + } + else if (strcmp (name, ".got") != 0 + && strcmp (name, ".plt") != 0 + && strcmp (name, ".got.plt") != 0 + && strcmp (name, ".xt.lit.plt") != 0) + { + /* It's not one of our sections, so don't allocate space. */ + continue; + } + + if (strip) + _bfd_strip_section_from_output (info, s); + else + { + /* Allocate memory for the section contents. */ + s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size); + if (s->contents == NULL && s->_raw_size != 0) + return FALSE; + } + } + + if (elf_hash_table (info)->dynamic_sections_created) + { + /* Add the special XTENSA_RTLD relocations now. The offsets won't be + known until finish_dynamic_sections, but we need to get the relocs + in place before they are sorted. */ + if (srelgot == NULL) + abort (); + for (chunk = 0; chunk < plt_chunks; chunk++) + { + Elf_Internal_Rela irela; + bfd_byte *loc; + + irela.r_offset = 0; + irela.r_info = ELF32_R_INFO (0, R_XTENSA_RTLD); + irela.r_addend = 0; + + loc = (srelgot->contents + + srelgot->reloc_count * sizeof (Elf32_External_Rela)); + bfd_elf32_swap_reloca_out (output_bfd, &irela, loc); + bfd_elf32_swap_reloca_out (output_bfd, &irela, + loc + sizeof (Elf32_External_Rela)); + srelgot->reloc_count += 2; + } + + /* Add some entries to the .dynamic section. We fill in the + values later, in elf_xtensa_finish_dynamic_sections, but we + must add the entries now so that we get the correct size for + the .dynamic section. The DT_DEBUG entry is filled in by the + dynamic linker and used by the debugger. */ +#define add_dynamic_entry(TAG, VAL) \ + bfd_elf32_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL)) + + if (! info->shared) + { + if (!add_dynamic_entry (DT_DEBUG, 0)) + return FALSE; + } + + if (relplt) + { + if (!add_dynamic_entry (DT_PLTGOT, 0) + || !add_dynamic_entry (DT_PLTRELSZ, 0) + || !add_dynamic_entry (DT_PLTREL, DT_RELA) + || !add_dynamic_entry (DT_JMPREL, 0)) + return FALSE; + } + + if (relgot) + { + if (!add_dynamic_entry (DT_RELA, 0) + || !add_dynamic_entry (DT_RELASZ, 0) + || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela))) + return FALSE; + } + + if ((info->flags & DF_TEXTREL) != 0) + { + if (!add_dynamic_entry (DT_TEXTREL, 0)) + return FALSE; + } + + if (!add_dynamic_entry (DT_XTENSA_GOT_LOC_OFF, 0) + || !add_dynamic_entry (DT_XTENSA_GOT_LOC_SZ, 0)) + return FALSE; + } +#undef add_dynamic_entry + + return TRUE; +} + + +/* Remove any PT_LOAD segments with no allocated sections. Prior to + binutils 2.13, this function used to remove the non-SEC_ALLOC + sections from PT_LOAD segments, but that task has now been moved + into elf.c. We still need this function to remove any empty + segments that result, but there's nothing Xtensa-specific about + this and it probably ought to be moved into elf.c as well. */ + +static bfd_boolean +elf_xtensa_modify_segment_map (abfd) + bfd *abfd; +{ + struct elf_segment_map **m_p; + + m_p = &elf_tdata (abfd)->segment_map; + while (*m_p != NULL) + { + if ((*m_p)->p_type == PT_LOAD && (*m_p)->count == 0) + *m_p = (*m_p)->next; + else + m_p = &(*m_p)->next; + } + return TRUE; +} + + +/* Perform the specified relocation. The instruction at (contents + address) + is modified to set one operand to represent the value in "relocation". The + operand position is determined by the relocation type recorded in the + howto. */ + +#define CALL_SEGMENT_BITS (30) +#define CALL_SEGMENT_SIZE (1<<CALL_SEGMENT_BITS) + +static bfd_reloc_status_type +elf_xtensa_do_reloc (howto, abfd, input_section, relocation, + contents, address, is_weak_undef, error_message) + reloc_howto_type *howto; + bfd *abfd; + asection *input_section; + bfd_vma relocation; + bfd_byte *contents; + bfd_vma address; + bfd_boolean is_weak_undef; + char **error_message; +{ + xtensa_opcode opcode; + xtensa_operand operand; + xtensa_encode_result encode_result; + xtensa_isa isa = xtensa_default_isa; + xtensa_insnbuf ibuff; + bfd_vma self_address; + int opnd; + uint32 newval; + + switch (howto->type) + { + case R_XTENSA_NONE: + return bfd_reloc_ok; + + case R_XTENSA_ASM_EXPAND: + if (!is_weak_undef) + { + /* Check for windowed CALL across a 1GB boundary. */ + xtensa_opcode opcode = + get_expanded_call_opcode (contents + address, + input_section->_raw_size - address); + if (is_windowed_call_opcode (opcode)) + { + self_address = (input_section->output_section->vma + + input_section->output_offset + + address); + if ((self_address >> CALL_SEGMENT_BITS) != + (relocation >> CALL_SEGMENT_BITS)) + { + *error_message = "windowed longcall crosses 1GB boundary; " + "return may fail"; + return bfd_reloc_dangerous; + } + } + } + return bfd_reloc_ok; + + case R_XTENSA_ASM_SIMPLIFY: + { + /* Convert the L32R/CALLX to CALL. */ + bfd_reloc_status_type retval = + elf_xtensa_do_asm_simplify (contents, address, + input_section->_raw_size); + if (retval != bfd_reloc_ok) + return retval; + + /* The CALL needs to be relocated. Continue below for that part. */ + address += 3; + howto = &elf_howto_table[(unsigned) R_XTENSA_OP0 ]; + } + break; + + case R_XTENSA_32: + case R_XTENSA_PLT: + { + bfd_vma x; + x = bfd_get_32 (abfd, contents + address); + x = x + relocation; + bfd_put_32 (abfd, x, contents + address); + } + return bfd_reloc_ok; + } + + /* Read the instruction into a buffer and decode the opcode. */ + ibuff = xtensa_insnbuf_alloc (isa); + xtensa_insnbuf_from_chars (isa, ibuff, contents + address); + opcode = xtensa_decode_insn (isa, ibuff); + + /* Determine which operand is being relocated. */ + if (opcode == XTENSA_UNDEFINED) + { + *error_message = "cannot decode instruction"; + return bfd_reloc_dangerous; + } + + if (howto->type < R_XTENSA_OP0 || howto->type > R_XTENSA_OP2) + { + *error_message = "unexpected relocation"; + return bfd_reloc_dangerous; + } + + opnd = howto->type - R_XTENSA_OP0; + + /* Calculate the PC address for this instruction. */ + if (!howto->pc_relative) + { + *error_message = "expected PC-relative relocation"; + return bfd_reloc_dangerous; + } + + self_address = (input_section->output_section->vma + + input_section->output_offset + + address); + + /* Apply the relocation. */ + operand = xtensa_get_operand (isa, opcode, opnd); + newval = xtensa_operand_do_reloc (operand, relocation, self_address); + encode_result = xtensa_operand_encode (operand, &newval); + xtensa_operand_set_field (operand, ibuff, newval); + + /* Write the modified instruction back out of the buffer. */ + xtensa_insnbuf_to_chars (isa, ibuff, contents + address); + free (ibuff); + + if (encode_result != xtensa_encode_result_ok) + { + char *message = build_encoding_error_message (opcode, encode_result); + *error_message = message; + return bfd_reloc_dangerous; + } + + /* Final check for call. */ + if (is_direct_call_opcode (opcode) + && is_windowed_call_opcode (opcode)) + { + if ((self_address >> CALL_SEGMENT_BITS) != + (relocation >> CALL_SEGMENT_BITS)) + { + *error_message = "windowed call crosses 1GB boundary; " + "return may fail"; + return bfd_reloc_dangerous; + } + } + + return bfd_reloc_ok; +} + + +static char * +vsprint_msg VPARAMS ((const char *origmsg, const char *fmt, int arglen, ...)) +{ + /* To reduce the size of the memory leak, + we only use a single message buffer. */ + static bfd_size_type alloc_size = 0; + static char *message = NULL; + bfd_size_type orig_len, len = 0; + bfd_boolean is_append; + + VA_OPEN (ap, arglen); + VA_FIXEDARG (ap, const char *, origmsg); + + is_append = (origmsg == message); + + orig_len = strlen (origmsg); + len = orig_len + strlen (fmt) + arglen + 20; + if (len > alloc_size) + { + message = (char *) bfd_realloc (message, len); + alloc_size = len; + } + if (!is_append) + memcpy (message, origmsg, orig_len); + vsprintf (message + orig_len, fmt, ap); + VA_CLOSE (ap); + return message; +} + + +static char * +build_encoding_error_message (opcode, encode_result) + xtensa_opcode opcode; + xtensa_encode_result encode_result; +{ + const char *opname = xtensa_opcode_name (xtensa_default_isa, opcode); + const char *msg = NULL; + + switch (encode_result) + { + case xtensa_encode_result_ok: + msg = "unexpected valid encoding"; + break; + case xtensa_encode_result_align: + msg = "misaligned encoding"; + break; + case xtensa_encode_result_not_in_table: + msg = "encoding not in lookup table"; + break; + case xtensa_encode_result_too_low: + msg = "encoding out of range: too low"; + break; + case xtensa_encode_result_too_high: + msg = "encoding out of range: too high"; + break; + case xtensa_encode_result_not_ok: + default: + msg = "could not encode"; + break; + } + + if (is_direct_call_opcode (opcode) + && (encode_result == xtensa_encode_result_too_low + || encode_result == xtensa_encode_result_too_high)) + + msg = "direct call out of range"; + + else if (opcode == get_l32r_opcode ()) + { + /* L32Rs have the strange interaction with encoding in that they + have an unsigned immediate field, so libisa returns "too high" + when the absolute value is out of range and never returns "too + low", but I leave the "too low" message in case anything + changes. */ + if (encode_result == xtensa_encode_result_too_low) + msg = "literal out of range"; + else if (encode_result == xtensa_encode_result_too_high) + msg = "literal placed after use"; + } + + return vsprint_msg (opname, ": %s", strlen (msg) + 2, msg); +} + + +/* This function is registered as the "special_function" in the + Xtensa howto for handling simplify operations. + bfd_perform_relocation / bfd_install_relocation use it to + perform (install) the specified relocation. Since this replaces the code + in bfd_perform_relocation, it is basically an Xtensa-specific, + stripped-down version of bfd_perform_relocation. */ + +static bfd_reloc_status_type +bfd_elf_xtensa_reloc (abfd, reloc_entry, symbol, data, input_section, + output_bfd, error_message) + bfd *abfd; + arelent *reloc_entry; + asymbol *symbol; + PTR data; + asection *input_section; + bfd *output_bfd; + char **error_message; +{ + bfd_vma relocation; + bfd_reloc_status_type flag; + bfd_size_type octets = reloc_entry->address * bfd_octets_per_byte (abfd); + bfd_vma output_base = 0; + reloc_howto_type *howto = reloc_entry->howto; + asection *reloc_target_output_section; + bfd_boolean is_weak_undef; + + /* ELF relocs are against symbols. If we are producing relocateable + output, and the reloc is against an external symbol, the resulting + reloc will also be against the same symbol. In such a case, we + don't want to change anything about the way the reloc is handled, + since it will all be done at final link time. This test is similar + to what bfd_elf_generic_reloc does except that it lets relocs with + howto->partial_inplace go through even if the addend is non-zero. + (The real problem is that partial_inplace is set for XTENSA_32 + relocs to begin with, but that's a long story and there's little we + can do about it now....) */ + + if (output_bfd != (bfd *) NULL + && (symbol->flags & BSF_SECTION_SYM) == 0) + { + reloc_entry->address += input_section->output_offset; + return bfd_reloc_ok; + } + + /* Is the address of the relocation really within the section? */ + if (reloc_entry->address > (input_section->_cooked_size + / bfd_octets_per_byte (abfd))) + return bfd_reloc_outofrange; + + /* Work out which section the relocation is targetted at and the + initial relocation command value. */ + + /* Get symbol value. (Common symbols are special.) */ + if (bfd_is_com_section (symbol->section)) + relocation = 0; + else + relocation = symbol->value; + + reloc_target_output_section = symbol->section->output_section; + + /* Convert input-section-relative symbol value to absolute. */ + if ((output_bfd && !howto->partial_inplace) + || reloc_target_output_section == NULL) + output_base = 0; + else + output_base = reloc_target_output_section->vma; + + relocation += output_base + symbol->section->output_offset; + + /* Add in supplied addend. */ + relocation += reloc_entry->addend; + + /* Here the variable relocation holds the final address of the + symbol we are relocating against, plus any addend. */ + if (output_bfd) + { + if (!howto->partial_inplace) + { + /* This is a partial relocation, and we want to apply the relocation + to the reloc entry rather than the raw data. Everything except + relocations against section symbols has already been handled + above. */ + + BFD_ASSERT (symbol->flags & BSF_SECTION_SYM); + reloc_entry->addend = relocation; + reloc_entry->address += input_section->output_offset; + return bfd_reloc_ok; + } + else + { + reloc_entry->address += input_section->output_offset; + reloc_entry->addend = 0; + } + } + + is_weak_undef = (bfd_is_und_section (symbol->section) + && (symbol->flags & BSF_WEAK) != 0); + flag = elf_xtensa_do_reloc (howto, abfd, input_section, relocation, + (bfd_byte *) data, (bfd_vma) octets, + is_weak_undef, error_message); + + if (flag == bfd_reloc_dangerous) + { + /* Add the symbol name to the error message. */ + if (! *error_message) + *error_message = ""; + *error_message = vsprint_msg (*error_message, ": (%s + 0x%lx)", + strlen (symbol->name) + 17, + symbol->name, reloc_entry->addend); + } + + return flag; +} + + +/* Set up an entry in the procedure linkage table. */ + +static bfd_vma +elf_xtensa_create_plt_entry (dynobj, output_bfd, reloc_index) + bfd *dynobj; + bfd *output_bfd; + unsigned reloc_index; +{ + asection *splt, *sgotplt; + bfd_vma plt_base, got_base; + bfd_vma code_offset, lit_offset; + int chunk; + + chunk = reloc_index / PLT_ENTRIES_PER_CHUNK; + splt = elf_xtensa_get_plt_section (dynobj, chunk); + sgotplt = elf_xtensa_get_gotplt_section (dynobj, chunk); + BFD_ASSERT (splt != NULL && sgotplt != NULL); + + plt_base = splt->output_section->vma + splt->output_offset; + got_base = sgotplt->output_section->vma + sgotplt->output_offset; + + lit_offset = 8 + (reloc_index % PLT_ENTRIES_PER_CHUNK) * 4; + code_offset = (reloc_index % PLT_ENTRIES_PER_CHUNK) * PLT_ENTRY_SIZE; + + /* Fill in the literal entry. This is the offset of the dynamic + relocation entry. */ + bfd_put_32 (output_bfd, reloc_index * sizeof (Elf32_External_Rela), + sgotplt->contents + lit_offset); + + /* Fill in the entry in the procedure linkage table. */ + memcpy (splt->contents + code_offset, + (bfd_big_endian (output_bfd) + ? elf_xtensa_be_plt_entry + : elf_xtensa_le_plt_entry), + PLT_ENTRY_SIZE); + bfd_put_16 (output_bfd, l32r_offset (got_base + 0, + plt_base + code_offset + 3), + splt->contents + code_offset + 4); + bfd_put_16 (output_bfd, l32r_offset (got_base + 4, + plt_base + code_offset + 6), + splt->contents + code_offset + 7); + bfd_put_16 (output_bfd, l32r_offset (got_base + lit_offset, + plt_base + code_offset + 9), + splt->contents + code_offset + 10); + + return plt_base + code_offset; +} + + +static bfd_boolean +xtensa_elf_dynamic_symbol_p (info, h) + struct bfd_link_info *info; + struct elf_link_hash_entry *h; +{ + if (h == NULL) + return FALSE; + + while (h->root.type == bfd_link_hash_indirect + || h->root.type == bfd_link_hash_warning) + h = (struct elf_link_hash_entry *) h->root.u.i.link; + + if (h->dynindx == -1) + return FALSE; + + if (h->root.type == bfd_link_hash_undefweak + || h->root.type == bfd_link_hash_defweak) + return TRUE; + + switch (ELF_ST_VISIBILITY (h->other)) + { + case STV_DEFAULT: + break; + case STV_HIDDEN: + case STV_INTERNAL: + return FALSE; + case STV_PROTECTED: + if (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) + return FALSE; + break; + } + + if ((info->shared && !info->symbolic) + || (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) + return TRUE; + + return FALSE; +} + + +/* Relocate an Xtensa ELF section. This is invoked by the linker for + both relocateable and final links. */ + +static bfd_boolean +elf_xtensa_relocate_section (output_bfd, info, input_bfd, + input_section, contents, relocs, + local_syms, local_sections) + bfd *output_bfd; + struct bfd_link_info *info; + bfd *input_bfd; + asection *input_section; + bfd_byte *contents; + Elf_Internal_Rela *relocs; + Elf_Internal_Sym *local_syms; + asection **local_sections; +{ + Elf_Internal_Shdr *symtab_hdr; + Elf_Internal_Rela *rel; + Elf_Internal_Rela *relend; + struct elf_link_hash_entry **sym_hashes; + asection *srelgot, *srelplt; + bfd *dynobj; + char *error_message = NULL; + + if (xtensa_default_isa == NULL) + xtensa_isa_init (); + + dynobj = elf_hash_table (info)->dynobj; + symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; + sym_hashes = elf_sym_hashes (input_bfd); + + srelgot = NULL; + srelplt = NULL; + if (dynobj != NULL) + { + srelgot = bfd_get_section_by_name (dynobj, ".rela.got");; + srelplt = bfd_get_section_by_name (dynobj, ".rela.plt"); + } + + rel = relocs; + relend = relocs + input_section->reloc_count; + for (; rel < relend; rel++) + { + int r_type; + reloc_howto_type *howto; + unsigned long r_symndx; + struct elf_link_hash_entry *h; + Elf_Internal_Sym *sym; + asection *sec; + bfd_vma relocation; + bfd_reloc_status_type r; + bfd_boolean is_weak_undef; + bfd_boolean unresolved_reloc; + bfd_boolean warned; + + r_type = ELF32_R_TYPE (rel->r_info); + if (r_type == (int) R_XTENSA_GNU_VTINHERIT + || r_type == (int) R_XTENSA_GNU_VTENTRY) + continue; + + if (r_type < 0 || r_type >= (int) R_XTENSA_max) + { + bfd_set_error (bfd_error_bad_value); + return FALSE; + } + howto = &elf_howto_table[r_type]; + + r_symndx = ELF32_R_SYM (rel->r_info); + + if (info->relocateable) + { + /* This is a relocateable link. + 1) If the reloc is against a section symbol, adjust + according to the output section. + 2) If there is a new target for this relocation, + the new target will be in the same output section. + We adjust the relocation by the output section + difference. */ + + if (relaxing_section) + { + /* Check if this references a section in another input file. */ + do_fix_for_relocateable_link (rel, input_bfd, input_section); + r_type = ELF32_R_TYPE (rel->r_info); + } + + if (r_type == R_XTENSA_ASM_SIMPLIFY) + { + /* Convert ASM_SIMPLIFY into the simpler relocation + so that they never escape a relaxing link. */ + contract_asm_expansion (contents, input_section->_raw_size, rel); + r_type = ELF32_R_TYPE (rel->r_info); + } + + /* This is a relocateable link, so we don't have to change + anything unless the reloc is against a section symbol, + in which case we have to adjust according to where the + section symbol winds up in the output section. */ + if (r_symndx < symtab_hdr->sh_info) + { + sym = local_syms + r_symndx; + if (ELF_ST_TYPE (sym->st_info) == STT_SECTION) + { + sec = local_sections[r_symndx]; + rel->r_addend += sec->output_offset + sym->st_value; + } + } + + /* If there is an addend with a partial_inplace howto, + then move the addend to the contents. This is a hack + to work around problems with DWARF in relocateable links + with some previous version of BFD. Now we can't easily get + rid of the hack without breaking backward compatibility.... */ + if (rel->r_addend) + { + howto = &elf_howto_table[r_type]; + if (howto->partial_inplace) + { + r = elf_xtensa_do_reloc (howto, input_bfd, input_section, + rel->r_addend, contents, + rel->r_offset, FALSE, + &error_message); + if (r != bfd_reloc_ok) + { + if (!((*info->callbacks->reloc_dangerous) + (info, error_message, input_bfd, input_section, + rel->r_offset))) + return FALSE; + } + rel->r_addend = 0; + } + } + + /* Done with work for relocateable link; continue with next reloc. */ + continue; + } + + /* This is a final link. */ + + h = NULL; + sym = NULL; + sec = NULL; + is_weak_undef = FALSE; + unresolved_reloc = FALSE; + warned = FALSE; + + if (howto->partial_inplace) + { + /* Because R_XTENSA_32 was made partial_inplace to fix some + problems with DWARF info in partial links, there may be + an addend stored in the contents. Take it out of there + and move it back into the addend field of the reloc. */ + rel->r_addend += bfd_get_32 (input_bfd, contents + rel->r_offset); + bfd_put_32 (input_bfd, 0, contents + rel->r_offset); + } + + if (r_symndx < symtab_hdr->sh_info) + { + sym = local_syms + r_symndx; + sec = local_sections[r_symndx]; + relocation = _bfd_elf_rela_local_sym (output_bfd, sym, sec, rel); + } + else + { + h = sym_hashes[r_symndx - symtab_hdr->sh_info]; + + while (h->root.type == bfd_link_hash_indirect + || h->root.type == bfd_link_hash_warning) + h = (struct elf_link_hash_entry *) h->root.u.i.link; + + relocation = 0; + if (h->root.type == bfd_link_hash_defined + || h->root.type == bfd_link_hash_defweak) + { + sec = h->root.u.def.section; + + if (sec->output_section == NULL) + /* Set a flag that will be cleared later if we find a + relocation value for this symbol. output_section + is typically NULL for symbols satisfied by a shared + library. */ + unresolved_reloc = TRUE; + else + relocation = (h->root.u.def.value + + sec->output_section->vma + + sec->output_offset); + } + else if (h->root.type == bfd_link_hash_undefweak) + is_weak_undef = TRUE; + else if (info->shared + && !info->no_undefined + && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) + ; + else + { + if (! ((*info->callbacks->undefined_symbol) + (info, h->root.root.string, input_bfd, + input_section, rel->r_offset, + (!info->shared || info->no_undefined + || ELF_ST_VISIBILITY (h->other))))) + return FALSE; + warned = TRUE; + } + } + + if (relaxing_section) + { + /* Check if this references a section in another input file. */ + do_fix_for_final_link (rel, input_section, &relocation); + + /* Update some already cached values. */ + r_type = ELF32_R_TYPE (rel->r_info); + howto = &elf_howto_table[r_type]; + } + + /* Sanity check the address. */ + if (rel->r_offset >= input_section->_raw_size + && ELF32_R_TYPE (rel->r_info) != R_XTENSA_NONE) + { + bfd_set_error (bfd_error_bad_value); + return FALSE; + } + + /* Generate dynamic relocations. */ + if (elf_hash_table (info)->dynamic_sections_created) + { + bfd_boolean dynamic_symbol = xtensa_elf_dynamic_symbol_p (info, h); + + if (dynamic_symbol && (r_type == R_XTENSA_OP0 + || r_type == R_XTENSA_OP1 + || r_type == R_XTENSA_OP2)) + { + /* This is an error. The symbol's real value won't be known + until runtime and it's likely to be out of range anyway. */ + const char *name = h->root.root.string; + error_message = vsprint_msg ("invalid relocation for dynamic " + "symbol", ": %s", + strlen (name) + 2, name); + if (!((*info->callbacks->reloc_dangerous) + (info, error_message, input_bfd, input_section, + rel->r_offset))) + return FALSE; + } + else if ((r_type == R_XTENSA_32 || r_type == R_XTENSA_PLT) + && (input_section->flags & SEC_ALLOC) != 0 + && (dynamic_symbol || info->shared)) + { + Elf_Internal_Rela outrel; + bfd_byte *loc; + asection *srel; + + if (dynamic_symbol && r_type == R_XTENSA_PLT) + srel = srelplt; + else + srel = srelgot; + + BFD_ASSERT (srel != NULL); + + outrel.r_offset = + _bfd_elf_section_offset (output_bfd, info, + input_section, rel->r_offset); + + if ((outrel.r_offset | 1) == (bfd_vma) -1) + memset (&outrel, 0, sizeof outrel); + else + { + outrel.r_offset = (input_section->output_section->vma + + input_section->output_offset); + + if (dynamic_symbol) + { + outrel.r_addend = rel->r_addend; + rel->r_addend = 0; + + if (r_type == R_XTENSA_32) + { + outrel.r_info = + ELF32_R_INFO (h->dynindx, R_XTENSA_GLOB_DAT); + relocation = 0; + } + else /* r_type == R_XTENSA_PLT */ + { + outrel.r_info = + ELF32_R_INFO (h->dynindx, R_XTENSA_JMP_SLOT); + + /* Create the PLT entry and set the initial + contents of the literal entry to the address of + the PLT entry. */ + relocation = + elf_xtensa_create_plt_entry (dynobj, output_bfd, + srel->reloc_count); + } + unresolved_reloc = FALSE; + } + else + { + /* Generate a RELATIVE relocation. */ + outrel.r_info = ELF32_R_INFO (0, R_XTENSA_RELATIVE); + outrel.r_addend = 0; + } + } + + loc = (srel->contents + + srel->reloc_count++ * sizeof (Elf32_External_Rela)); + bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); + BFD_ASSERT (sizeof (Elf32_External_Rela) * srel->reloc_count + <= srel->_cooked_size); + } + } + + /* Dynamic relocs are not propagated for SEC_DEBUGGING sections + because such sections are not SEC_ALLOC and thus ld.so will + not process them. */ + if (unresolved_reloc + && !((input_section->flags & SEC_DEBUGGING) != 0 + && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0)) + (*_bfd_error_handler) + (_("%s(%s+0x%lx): unresolvable relocation against symbol `%s'"), + bfd_archive_filename (input_bfd), + bfd_get_section_name (input_bfd, input_section), + (long) rel->r_offset, + h->root.root.string); + + /* There's no point in calling bfd_perform_relocation here. + Just go directly to our "special function". */ + r = elf_xtensa_do_reloc (howto, input_bfd, input_section, + relocation + rel->r_addend, + contents, rel->r_offset, is_weak_undef, + &error_message); + + if (r != bfd_reloc_ok && !warned) + { + const char *name; + + BFD_ASSERT (r == bfd_reloc_dangerous); + BFD_ASSERT (error_message != (char *) NULL); + + if (h != NULL) + name = h->root.root.string; + else + { + name = bfd_elf_string_from_elf_section + (input_bfd, symtab_hdr->sh_link, sym->st_name); + if (name && *name == '\0') + name = bfd_section_name (input_bfd, sec); + } + if (name) + error_message = vsprint_msg (error_message, ": %s", + strlen (name), name); + if (!((*info->callbacks->reloc_dangerous) + (info, error_message, input_bfd, input_section, + rel->r_offset))) + return FALSE; + } + } + + return TRUE; +} + + +/* Finish up dynamic symbol handling. There's not much to do here since + the PLT and GOT entries are all set up by relocate_section. */ + +static bfd_boolean +elf_xtensa_finish_dynamic_symbol (output_bfd, info, h, sym) + bfd *output_bfd ATTRIBUTE_UNUSED; + struct bfd_link_info *info ATTRIBUTE_UNUSED; + struct elf_link_hash_entry *h; + Elf_Internal_Sym *sym; +{ + if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0 + && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) + { + /* Mark the symbol as undefined, rather than as defined in + the .plt section. Leave the value alone. */ + sym->st_shndx = SHN_UNDEF; + } + + /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ + if (strcmp (h->root.root.string, "_DYNAMIC") == 0 + || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) + sym->st_shndx = SHN_ABS; + + return TRUE; +} + + +/* Combine adjacent literal table entries in the output. Adjacent + entries within each input section may have been removed during + relaxation, but we repeat the process here, even though it's too late + to shrink the output section, because it's important to minimize the + number of literal table entries to reduce the start-up work for the + runtime linker. Returns the number of remaining table entries or -1 + on error. */ + +static int +elf_xtensa_combine_prop_entries (output_bfd, secname) + bfd *output_bfd; + const char *secname; +{ + asection *sec; + bfd_byte *contents; + property_table_entry *table; + bfd_size_type section_size; + bfd_vma offset; + int n, m, num; + + sec = bfd_get_section_by_name (output_bfd, secname); + if (!sec) + return -1; + + section_size = (sec->_cooked_size != 0 ? sec->_cooked_size : sec->_raw_size); + BFD_ASSERT (section_size % 8 == 0); + num = section_size / 8; + + contents = (bfd_byte *) bfd_malloc (section_size); + table = (property_table_entry *) + bfd_malloc (num * sizeof (property_table_entry)); + if (contents == 0 || table == 0) + return -1; + + /* The ".xt.lit.plt" section has the SEC_IN_MEMORY flag set and this + propagates to the output section, where it doesn't really apply and + where it breaks the following call to bfd_get_section_contents. */ + sec->flags &= ~SEC_IN_MEMORY; + + if (! bfd_get_section_contents (output_bfd, sec, contents, 0, section_size)) + return -1; + + /* There should never be any relocations left at this point, so this + is quite a bit easier than what is done during relaxation. */ + + /* Copy the raw contents into a property table array and sort it. */ + offset = 0; + for (n = 0; n < num; n++) + { + table[n].address = bfd_get_32 (output_bfd, &contents[offset]); + table[n].size = bfd_get_32 (output_bfd, &contents[offset + 4]); + offset += 8; + } + qsort (table, num, sizeof (property_table_entry), property_table_compare); + + for (n = 0; n < num; n++) + { + bfd_boolean remove = FALSE; + + if (table[n].size == 0) + remove = TRUE; + else if (n > 0 && + (table[n-1].address + table[n-1].size == table[n].address)) + { + table[n-1].size += table[n].size; + remove = TRUE; + } + + if (remove) + { + for (m = n; m < num - 1; m++) + { + table[m].address = table[m+1].address; + table[m].size = table[m+1].size; + } + + n--; + num--; + } + } + + /* Copy the data back to the raw contents. */ + offset = 0; + for (n = 0; n < num; n++) + { + bfd_put_32 (output_bfd, table[n].address, &contents[offset]); + bfd_put_32 (output_bfd, table[n].size, &contents[offset + 4]); + offset += 8; + } + + /* Clear the removed bytes. */ + if ((bfd_size_type) (num * 8) < section_size) + { + memset (&contents[num * 8], 0, section_size - num * 8); + sec->_cooked_size = num * 8; + } + + if (! bfd_set_section_contents (output_bfd, sec, contents, 0, section_size)) + return -1; + + free (contents); + return num; +} + + +/* Finish up the dynamic sections. */ + +static bfd_boolean +elf_xtensa_finish_dynamic_sections (output_bfd, info) + bfd *output_bfd; + struct bfd_link_info *info; +{ + bfd *dynobj; + asection *sdyn, *srelplt, *sgot; + Elf32_External_Dyn *dyncon, *dynconend; + int num_xtlit_entries; + + if (! elf_hash_table (info)->dynamic_sections_created) + return TRUE; + + dynobj = elf_hash_table (info)->dynobj; + sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); + BFD_ASSERT (sdyn != NULL); + + /* Set the first entry in the global offset table to the address of + the dynamic section. */ + sgot = bfd_get_section_by_name (dynobj, ".got"); + if (sgot) + { + BFD_ASSERT (sgot->_raw_size == 4); + if (sdyn == NULL) + bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents); + else + bfd_put_32 (output_bfd, + sdyn->output_section->vma + sdyn->output_offset, + sgot->contents); + } + + srelplt = bfd_get_section_by_name (dynobj, ".rela.plt"); + if (srelplt != NULL && srelplt->_raw_size != 0) + { + asection *sgotplt, *srelgot, *spltlittbl; + int chunk, plt_chunks, plt_entries; + Elf_Internal_Rela irela; + bfd_byte *loc; + unsigned rtld_reloc; + + srelgot = bfd_get_section_by_name (dynobj, ".rela.got");; + BFD_ASSERT (srelgot != NULL); + + spltlittbl = bfd_get_section_by_name (dynobj, ".xt.lit.plt"); + BFD_ASSERT (spltlittbl != NULL); + + /* Find the first XTENSA_RTLD relocation. Presumably the rest + of them follow immediately after.... */ + for (rtld_reloc = 0; rtld_reloc < srelgot->reloc_count; rtld_reloc++) + { + loc = srelgot->contents + rtld_reloc * sizeof (Elf32_External_Rela); + bfd_elf32_swap_reloca_in (output_bfd, loc, &irela); + if (ELF32_R_TYPE (irela.r_info) == R_XTENSA_RTLD) + break; + } + BFD_ASSERT (rtld_reloc < srelgot->reloc_count); + + plt_entries = (srelplt->_raw_size / sizeof (Elf32_External_Rela)); + plt_chunks = + (plt_entries + PLT_ENTRIES_PER_CHUNK - 1) / PLT_ENTRIES_PER_CHUNK; + + for (chunk = 0; chunk < plt_chunks; chunk++) + { + int chunk_entries = 0; + + sgotplt = elf_xtensa_get_gotplt_section (dynobj, chunk); + BFD_ASSERT (sgotplt != NULL); + + /* Emit special RTLD relocations for the first two entries in + each chunk of the .got.plt section. */ + + loc = srelgot->contents + rtld_reloc * sizeof (Elf32_External_Rela); + bfd_elf32_swap_reloca_in (output_bfd, loc, &irela); + BFD_ASSERT (ELF32_R_TYPE (irela.r_info) == R_XTENSA_RTLD); + irela.r_offset = (sgotplt->output_section->vma + + sgotplt->output_offset); + irela.r_addend = 1; /* tell rtld to set value to resolver function */ + bfd_elf32_swap_reloca_out (output_bfd, &irela, loc); + rtld_reloc += 1; + BFD_ASSERT (rtld_reloc <= srelgot->reloc_count); + + /* Next literal immediately follows the first. */ + loc += sizeof (Elf32_External_Rela); + bfd_elf32_swap_reloca_in (output_bfd, loc, &irela); + BFD_ASSERT (ELF32_R_TYPE (irela.r_info) == R_XTENSA_RTLD); + irela.r_offset = (sgotplt->output_section->vma + + sgotplt->output_offset + 4); + /* Tell rtld to set value to object's link map. */ + irela.r_addend = 2; + bfd_elf32_swap_reloca_out (output_bfd, &irela, loc); + rtld_reloc += 1; + BFD_ASSERT (rtld_reloc <= srelgot->reloc_count); + + /* Fill in the literal table. */ + if (chunk < plt_chunks - 1) + chunk_entries = PLT_ENTRIES_PER_CHUNK; + else + chunk_entries = plt_entries - (chunk * PLT_ENTRIES_PER_CHUNK); + + BFD_ASSERT ((unsigned) (chunk + 1) * 8 <= spltlittbl->_cooked_size); + bfd_put_32 (output_bfd, + sgotplt->output_section->vma + sgotplt->output_offset, + spltlittbl->contents + (chunk * 8) + 0); + bfd_put_32 (output_bfd, + 8 + (chunk_entries * 4), + spltlittbl->contents + (chunk * 8) + 4); + } + + /* All the dynamic relocations have been emitted at this point. + Make sure the relocation sections are the correct size. */ + if (srelgot->_cooked_size != (sizeof (Elf32_External_Rela) + * srelgot->reloc_count) + || srelplt->_cooked_size != (sizeof (Elf32_External_Rela) + * srelplt->reloc_count)) + abort (); + + /* The .xt.lit.plt section has just been modified. This must + happen before the code below which combines adjacent literal + table entries, and the .xt.lit.plt contents have to be forced to + the output here. */ + if (! bfd_set_section_contents (output_bfd, + spltlittbl->output_section, + spltlittbl->contents, + spltlittbl->output_offset, + spltlittbl->_raw_size)) + return FALSE; + /* Clear SEC_HAS_CONTENTS so the contents won't be output again. */ + spltlittbl->flags &= ~SEC_HAS_CONTENTS; + } + + /* Combine adjacent literal table entries. */ + BFD_ASSERT (! info->relocateable); + num_xtlit_entries = elf_xtensa_combine_prop_entries (output_bfd, ".xt.lit"); + if (num_xtlit_entries < 0) + return FALSE; + + dyncon = (Elf32_External_Dyn *) sdyn->contents; + dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size); + for (; dyncon < dynconend; dyncon++) + { + Elf_Internal_Dyn dyn; + const char *name; + asection *s; + + bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); + + switch (dyn.d_tag) + { + default: + break; + + case DT_XTENSA_GOT_LOC_SZ: + s = bfd_get_section_by_name (output_bfd, ".xt.lit"); + BFD_ASSERT (s); + dyn.d_un.d_val = num_xtlit_entries; + break; + + case DT_XTENSA_GOT_LOC_OFF: + name = ".xt.lit"; + goto get_vma; + case DT_PLTGOT: + name = ".got"; + goto get_vma; + case DT_JMPREL: + name = ".rela.plt"; + get_vma: + s = bfd_get_section_by_name (output_bfd, name); + BFD_ASSERT (s); + dyn.d_un.d_ptr = s->vma; + break; + + case DT_PLTRELSZ: + s = bfd_get_section_by_name (output_bfd, ".rela.plt"); + BFD_ASSERT (s); + dyn.d_un.d_val = (s->_cooked_size ? s->_cooked_size : s->_raw_size); + break; + + case DT_RELASZ: + /* Adjust RELASZ to not include JMPREL. This matches what + glibc expects and what is done for several other ELF + targets (e.g., i386, alpha), but the "correct" behavior + seems to be unresolved. Since the linker script arranges + for .rela.plt to follow all other relocation sections, we + don't have to worry about changing the DT_RELA entry. */ + s = bfd_get_section_by_name (output_bfd, ".rela.plt"); + if (s) + { + dyn.d_un.d_val -= + (s->_cooked_size ? s->_cooked_size : s->_raw_size); + } + break; + } + + bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); + } + + return TRUE; +} + + +/* Functions for dealing with the e_flags field. */ + +/* Merge backend specific data from an object file to the output + object file when linking. */ + +static bfd_boolean +elf_xtensa_merge_private_bfd_data (ibfd, obfd) + bfd *ibfd; + bfd *obfd; +{ + unsigned out_mach, in_mach; + flagword out_flag, in_flag; + + /* Check if we have the same endianess. */ + if (!_bfd_generic_verify_endian_match (ibfd, obfd)) + return FALSE; + + /* Don't even pretend to support mixed-format linking. */ + if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour + || bfd_get_flavour (obfd) != bfd_target_elf_flavour) + return FALSE; + + out_flag = elf_elfheader (obfd)->e_flags; + in_flag = elf_elfheader (ibfd)->e_flags; + + out_mach = out_flag & EF_XTENSA_MACH; + in_mach = in_flag & EF_XTENSA_MACH; + if (out_mach != in_mach) + { + (*_bfd_error_handler) + ("%s: incompatible machine type. Output is 0x%x. Input is 0x%x\n", + bfd_archive_filename (ibfd), out_mach, in_mach); + bfd_set_error (bfd_error_wrong_format); + return FALSE; + } + + if (! elf_flags_init (obfd)) + { + elf_flags_init (obfd) = TRUE; + elf_elfheader (obfd)->e_flags = in_flag; + + if (bfd_get_arch (obfd) == bfd_get_arch (ibfd) + && bfd_get_arch_info (obfd)->the_default) + return bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), + bfd_get_mach (ibfd)); + + return TRUE; + } + + if ((out_flag & EF_XTENSA_XT_INSN) != + (in_flag & EF_XTENSA_XT_INSN)) + elf_elfheader(obfd)->e_flags &= (~ EF_XTENSA_XT_INSN); + + if ((out_flag & EF_XTENSA_XT_LIT) != + (in_flag & EF_XTENSA_XT_LIT)) + elf_elfheader(obfd)->e_flags &= (~ EF_XTENSA_XT_LIT); + + return TRUE; +} + + +static bfd_boolean +elf_xtensa_set_private_flags (abfd, flags) + bfd *abfd; + flagword flags; +{ + BFD_ASSERT (!elf_flags_init (abfd) + || elf_elfheader (abfd)->e_flags == flags); + + elf_elfheader (abfd)->e_flags |= flags; + elf_flags_init (abfd) = TRUE; + + return TRUE; +} + + +extern flagword +elf_xtensa_get_private_bfd_flags (abfd) + bfd *abfd; +{ + return elf_elfheader (abfd)->e_flags; +} + + +static bfd_boolean +elf_xtensa_print_private_bfd_data (abfd, farg) + bfd *abfd; + PTR farg; +{ + FILE *f = (FILE *) farg; + flagword e_flags = elf_elfheader (abfd)->e_flags; + + fprintf (f, "\nXtensa header:\n"); + if ((e_flags & EF_XTENSA_MACH) == E_XTENSA_MACH) + fprintf (f, "\nMachine = Base\n"); + else + fprintf (f, "\nMachine Id = 0x%x\n", e_flags & EF_XTENSA_MACH); + + fprintf (f, "Insn tables = %s\n", + (e_flags & EF_XTENSA_XT_INSN) ? "true" : "false"); + + fprintf (f, "Literal tables = %s\n", + (e_flags & EF_XTENSA_XT_LIT) ? "true" : "false"); + + return _bfd_elf_print_private_bfd_data (abfd, farg); +} + + +/* Set the right machine number for an Xtensa ELF file. */ + +static bfd_boolean +elf_xtensa_object_p (abfd) + bfd *abfd; +{ + int mach; + unsigned long arch = elf_elfheader (abfd)->e_flags & EF_XTENSA_MACH; + + switch (arch) + { + case E_XTENSA_MACH: + mach = bfd_mach_xtensa; + break; + default: + return FALSE; + } + + (void) bfd_default_set_arch_mach (abfd, bfd_arch_xtensa, mach); + return TRUE; +} + + +/* The final processing done just before writing out an Xtensa ELF object + file. This gets the Xtensa architecture right based on the machine + number. */ + +static void +elf_xtensa_final_write_processing (abfd, linker) + bfd *abfd; + bfd_boolean linker ATTRIBUTE_UNUSED; +{ + int mach; + unsigned long val; + + switch (mach = bfd_get_mach (abfd)) + { + case bfd_mach_xtensa: + val = E_XTENSA_MACH; + break; + default: + return; + } + + elf_elfheader (abfd)->e_flags &= (~ EF_XTENSA_MACH); + elf_elfheader (abfd)->e_flags |= val; +} + + +static enum elf_reloc_type_class +elf_xtensa_reloc_type_class (rela) + const Elf_Internal_Rela *rela; +{ + switch ((int) ELF32_R_TYPE (rela->r_info)) + { + case R_XTENSA_RELATIVE: + return reloc_class_relative; + case R_XTENSA_JMP_SLOT: + return reloc_class_plt; + default: + return reloc_class_normal; + } +} + + +static bfd_boolean +elf_xtensa_discard_info_for_section (abfd, cookie, info, sec) + bfd *abfd; + struct elf_reloc_cookie *cookie; + struct bfd_link_info *info; + asection *sec; +{ + bfd_byte *contents; + bfd_vma section_size; + bfd_vma offset, actual_offset; + size_t removed_bytes = 0; + + section_size = (sec->_cooked_size ? sec->_cooked_size : sec->_raw_size); + if (section_size == 0 || section_size % 8 != 0) + return FALSE; + + if (sec->output_section + && bfd_is_abs_section (sec->output_section)) + return FALSE; + + contents = retrieve_contents (abfd, sec, info->keep_memory); + if (!contents) + return FALSE; + + cookie->rels = retrieve_internal_relocs (abfd, sec, info->keep_memory); + if (!cookie->rels) + { + release_contents (sec, contents); + return FALSE; + } + + cookie->rel = cookie->rels; + cookie->relend = cookie->rels + sec->reloc_count; + + for (offset = 0; offset < section_size; offset += 8) + { + actual_offset = offset - removed_bytes; + + /* The ...symbol_deleted_p function will skip over relocs but it + won't adjust their offsets, so do that here. */ + while (cookie->rel < cookie->relend + && cookie->rel->r_offset < offset) + { + cookie->rel->r_offset -= removed_bytes; + cookie->rel++; + } + + while (cookie->rel < cookie->relend + && cookie->rel->r_offset == offset) + { + if (_bfd_elf32_reloc_symbol_deleted_p (offset, cookie)) + { + /* Remove the table entry. (If the reloc type is NONE, then + the entry has already been merged with another and deleted + during relaxation.) */ + if (ELF32_R_TYPE (cookie->rel->r_info) != R_XTENSA_NONE) + { + /* Shift the contents up. */ + if (offset + 8 < section_size) + memmove (&contents[actual_offset], + &contents[actual_offset+8], + section_size - offset - 8); + removed_bytes += 8; + } + + /* Remove this relocation. */ + cookie->rel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE); + } + + /* Adjust the relocation offset for previous removals. This + should not be done before calling ...symbol_deleted_p + because it might mess up the offset comparisons there. + Make sure the offset doesn't underflow in the case where + the first entry is removed. */ + if (cookie->rel->r_offset >= removed_bytes) + cookie->rel->r_offset -= removed_bytes; + else + cookie->rel->r_offset = 0; + + cookie->rel++; + } + } + + if (removed_bytes != 0) + { + /* Adjust any remaining relocs (shouldn't be any). */ + for (; cookie->rel < cookie->relend; cookie->rel++) + { + if (cookie->rel->r_offset >= removed_bytes) + cookie->rel->r_offset -= removed_bytes; + else + cookie->rel->r_offset = 0; + } + + /* Clear the removed bytes. */ + memset (&contents[section_size - removed_bytes], 0, removed_bytes); + + pin_contents (sec, contents); + pin_internal_relocs (sec, cookie->rels); + + sec->_cooked_size = section_size - removed_bytes; + /* Also shrink _raw_size. See comments in relax_property_section. */ + sec->_raw_size = sec->_cooked_size; + } + else + { + release_contents (sec, contents); + release_internal_relocs (sec, cookie->rels); + } + + return (removed_bytes != 0); +} + + +static bfd_boolean +elf_xtensa_discard_info (abfd, cookie, info) + bfd *abfd; + struct elf_reloc_cookie *cookie; + struct bfd_link_info *info; +{ + asection *sec; + bfd_boolean changed = FALSE; + + for (sec = abfd->sections; sec != NULL; sec = sec->next) + { + if (xtensa_is_property_section (sec)) + { + if (elf_xtensa_discard_info_for_section (abfd, cookie, info, sec)) + changed = TRUE; + } + } + + return changed; +} + + +static bfd_boolean +elf_xtensa_ignore_discarded_relocs (sec) + asection *sec; +{ + return xtensa_is_property_section (sec); +} + + +/* Support for core dump NOTE sections. */ + +static bfd_boolean +elf_xtensa_grok_prstatus (abfd, note) + bfd *abfd; + Elf_Internal_Note *note; +{ + int offset; + unsigned int raw_size; + + /* The size for Xtensa is variable, so don't try to recognize the format + based on the size. Just assume this is GNU/Linux. */ + + /* pr_cursig */ + elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12); + + /* pr_pid */ + elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24); + + /* pr_reg */ + offset = 72; + raw_size = note->descsz - offset - 4; + + /* Make a ".reg/999" section. */ + return _bfd_elfcore_make_pseudosection (abfd, ".reg", + raw_size, note->descpos + offset); +} + + +static bfd_boolean +elf_xtensa_grok_psinfo (abfd, note) + bfd *abfd; + Elf_Internal_Note *note; +{ + switch (note->descsz) + { + default: + return FALSE; + + case 128: /* GNU/Linux elf_prpsinfo */ + elf_tdata (abfd)->core_program + = _bfd_elfcore_strndup (abfd, note->descdata + 32, 16); + elf_tdata (abfd)->core_command + = _bfd_elfcore_strndup (abfd, note->descdata + 48, 80); + } + + /* Note that for some reason, a spurious space is tacked + onto the end of the args in some (at least one anyway) + implementations, so strip it off if it exists. */ + + { + char *command = elf_tdata (abfd)->core_command; + int n = strlen (command); + + if (0 < n && command[n - 1] == ' ') + command[n - 1] = '\0'; + } + + return TRUE; +} + + +/* Generic Xtensa configurability stuff. */ + +static xtensa_opcode callx0_op = XTENSA_UNDEFINED; +static xtensa_opcode callx4_op = XTENSA_UNDEFINED; +static xtensa_opcode callx8_op = XTENSA_UNDEFINED; +static xtensa_opcode callx12_op = XTENSA_UNDEFINED; +static xtensa_opcode call0_op = XTENSA_UNDEFINED; +static xtensa_opcode call4_op = XTENSA_UNDEFINED; +static xtensa_opcode call8_op = XTENSA_UNDEFINED; +static xtensa_opcode call12_op = XTENSA_UNDEFINED; + +static void +init_call_opcodes () +{ + if (callx0_op == XTENSA_UNDEFINED) + { + callx0_op = xtensa_opcode_lookup (xtensa_default_isa, "callx0"); + callx4_op = xtensa_opcode_lookup (xtensa_default_isa, "callx4"); + callx8_op = xtensa_opcode_lookup (xtensa_default_isa, "callx8"); + callx12_op = xtensa_opcode_lookup (xtensa_default_isa, "callx12"); + call0_op = xtensa_opcode_lookup (xtensa_default_isa, "call0"); + call4_op = xtensa_opcode_lookup (xtensa_default_isa, "call4"); + call8_op = xtensa_opcode_lookup (xtensa_default_isa, "call8"); + call12_op = xtensa_opcode_lookup (xtensa_default_isa, "call12"); + } +} + + +static bfd_boolean +is_indirect_call_opcode (opcode) + xtensa_opcode opcode; +{ + init_call_opcodes (); + return (opcode == callx0_op + || opcode == callx4_op + || opcode == callx8_op + || opcode == callx12_op); +} + + +static bfd_boolean +is_direct_call_opcode (opcode) + xtensa_opcode opcode; +{ + init_call_opcodes (); + return (opcode == call0_op + || opcode == call4_op + || opcode == call8_op + || opcode == call12_op); +} + + +static bfd_boolean +is_windowed_call_opcode (opcode) + xtensa_opcode opcode; +{ + init_call_opcodes (); + return (opcode == call4_op + || opcode == call8_op + || opcode == call12_op + || opcode == callx4_op + || opcode == callx8_op + || opcode == callx12_op); +} + + +static xtensa_opcode +get_l32r_opcode (void) +{ + static xtensa_opcode l32r_opcode = XTENSA_UNDEFINED; + if (l32r_opcode == XTENSA_UNDEFINED) + { + l32r_opcode = xtensa_opcode_lookup (xtensa_default_isa, "l32r"); + BFD_ASSERT (l32r_opcode != XTENSA_UNDEFINED); + } + return l32r_opcode; +} + + +static bfd_vma +l32r_offset (addr, pc) + bfd_vma addr; + bfd_vma pc; +{ + bfd_vma offset; + + offset = addr - ((pc+3) & -4); + BFD_ASSERT ((offset & ((1 << 2) - 1)) == 0); + offset = (signed int) offset >> 2; + BFD_ASSERT ((signed int) offset >> 16 == -1); + return offset; +} + + +/* Get the operand number for a PC-relative relocation. + If the relocation is not a PC-relative one, return (-1). */ + +static int +get_relocation_opnd (irel) + Elf_Internal_Rela *irel; +{ + if (ELF32_R_TYPE (irel->r_info) < R_XTENSA_OP0 + || ELF32_R_TYPE (irel->r_info) >= R_XTENSA_max) + return -1; + return ELF32_R_TYPE (irel->r_info) - R_XTENSA_OP0; +} + + +/* Get the opcode for a relocation. */ + +static xtensa_opcode +get_relocation_opcode (sec, contents, irel) + asection *sec; + bfd_byte *contents; + Elf_Internal_Rela *irel; +{ + static xtensa_insnbuf ibuff = NULL; + xtensa_isa isa = xtensa_default_isa; + + if (get_relocation_opnd (irel) == -1) + return XTENSA_UNDEFINED; + + if (contents == NULL) + return XTENSA_UNDEFINED; + + if (sec->_raw_size <= irel->r_offset) + return XTENSA_UNDEFINED; + + if (ibuff == NULL) + ibuff = xtensa_insnbuf_alloc (isa); + + /* Decode the instruction. */ + xtensa_insnbuf_from_chars (isa, ibuff, &contents[irel->r_offset]); + return xtensa_decode_insn (isa, ibuff); +} + + +bfd_boolean +is_l32r_relocation (sec, contents, irel) + asection *sec; + bfd_byte *contents; + Elf_Internal_Rela *irel; +{ + xtensa_opcode opcode; + + if (ELF32_R_TYPE (irel->r_info) != R_XTENSA_OP1) + return FALSE; + + opcode = get_relocation_opcode (sec, contents, irel); + return (opcode == get_l32r_opcode ()); +} + + +/* Code for transforming CALLs at link-time. */ + +static bfd_reloc_status_type +elf_xtensa_do_asm_simplify (contents, address, content_length) + bfd_byte *contents; + bfd_vma address; + bfd_vma content_length; +{ + static xtensa_insnbuf insnbuf = NULL; + xtensa_opcode opcode; + xtensa_operand operand; + xtensa_opcode direct_call_opcode; + xtensa_isa isa = xtensa_default_isa; + bfd_byte *chbuf = contents + address; + int opn; + + if (insnbuf == NULL) + insnbuf = xtensa_insnbuf_alloc (isa); + + if (content_length < address) + { + (*_bfd_error_handler) + ("Attempt to convert L32R/CALLX to CALL failed\n"); + return bfd_reloc_other; + } + + opcode = get_expanded_call_opcode (chbuf, content_length - address); + direct_call_opcode = swap_callx_for_call_opcode (opcode); + if (direct_call_opcode == XTENSA_UNDEFINED) + { + (*_bfd_error_handler) + ("Attempt to convert L32R/CALLX to CALL failed\n"); + return bfd_reloc_other; + } + + /* Assemble a NOP ("or a1, a1, a1") into the 0 byte offset. */ + opcode = xtensa_opcode_lookup (isa, "or"); + xtensa_encode_insn (isa, opcode, insnbuf); + for (opn = 0; opn < 3; opn++) + { + operand = xtensa_get_operand (isa, opcode, opn); + xtensa_operand_set_field (operand, insnbuf, 1); + } + xtensa_insnbuf_to_chars (isa, insnbuf, chbuf); + + /* Assemble a CALL ("callN 0") into the 3 byte offset. */ + xtensa_encode_insn (isa, direct_call_opcode, insnbuf); + operand = xtensa_get_operand (isa, opcode, 0); + xtensa_operand_set_field (operand, insnbuf, 0); + xtensa_insnbuf_to_chars (isa, insnbuf, chbuf + 3); + + return bfd_reloc_ok; +} + + +static bfd_reloc_status_type +contract_asm_expansion (contents, content_length, irel) + bfd_byte *contents; + bfd_vma content_length; + Elf_Internal_Rela *irel; +{ + bfd_reloc_status_type retval = + elf_xtensa_do_asm_simplify (contents, irel->r_offset, content_length); + + if (retval != bfd_reloc_ok) + return retval; + + /* Update the irel->r_offset field so that the right immediate and + the right instruction are modified during the relocation. */ + irel->r_offset += 3; + irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), R_XTENSA_OP0); + return bfd_reloc_ok; +} + + +static xtensa_opcode +swap_callx_for_call_opcode (opcode) + xtensa_opcode opcode; +{ + init_call_opcodes (); + + if (opcode == callx0_op) return call0_op; + if (opcode == callx4_op) return call4_op; + if (opcode == callx8_op) return call8_op; + if (opcode == callx12_op) return call12_op; + + /* Return XTENSA_UNDEFINED if the opcode is not an indirect call. */ + return XTENSA_UNDEFINED; +} + + +/* Check if "buf" is pointing to a "L32R aN; CALLX aN" sequence, and + if so, return the CALLX opcode. If not, return XTENSA_UNDEFINED. */ + +#define L32R_TARGET_REG_OPERAND 0 +#define CALLN_SOURCE_OPERAND 0 + +static xtensa_opcode +get_expanded_call_opcode (buf, bufsize) + bfd_byte *buf; + int bufsize; +{ + static xtensa_insnbuf insnbuf = NULL; + xtensa_opcode opcode; + xtensa_operand operand; + xtensa_isa isa = xtensa_default_isa; + uint32 regno, call_regno; + + /* Buffer must be at least 6 bytes. */ + if (bufsize < 6) + return XTENSA_UNDEFINED; + + if (insnbuf == NULL) + insnbuf = xtensa_insnbuf_alloc (isa); + + xtensa_insnbuf_from_chars (isa, insnbuf, buf); + opcode = xtensa_decode_insn (isa, insnbuf); + + if (opcode != get_l32r_opcode ()) + return XTENSA_UNDEFINED; + + operand = xtensa_get_operand (isa, opcode, L32R_TARGET_REG_OPERAND); + regno = xtensa_operand_decode + (operand, xtensa_operand_get_field (operand, insnbuf)); + + /* Next instruction should be an CALLXn with operand 0 == regno. */ + xtensa_insnbuf_from_chars (isa, insnbuf, + buf + xtensa_insn_length (isa, opcode)); + opcode = xtensa_decode_insn (isa, insnbuf); + + if (!is_indirect_call_opcode (opcode)) + return XTENSA_UNDEFINED; + + operand = xtensa_get_operand (isa, opcode, CALLN_SOURCE_OPERAND); + call_regno = xtensa_operand_decode + (operand, xtensa_operand_get_field (operand, insnbuf)); + if (call_regno != regno) + return XTENSA_UNDEFINED; + + return opcode; +} + + +/* Data structures used during relaxation. */ + +/* r_reloc: relocation values. */ + +/* Through the relaxation process, we need to keep track of the values + that will result from evaluating relocations. The standard ELF + relocation structure is not sufficient for this purpose because we're + operating on multiple input files at once, so we need to know which + input file a relocation refers to. The r_reloc structure thus + records both the input file (bfd) and ELF relocation. + + For efficiency, an r_reloc also contains a "target_offset" field to + cache the target-section-relative offset value that is represented by + the relocation. */ + +typedef struct r_reloc_struct r_reloc; + +struct r_reloc_struct +{ + bfd *abfd; + Elf_Internal_Rela rela; + bfd_vma target_offset; +}; + +static bfd_boolean r_reloc_is_const + PARAMS ((const r_reloc *)); +static void r_reloc_init + PARAMS ((r_reloc *, bfd *, Elf_Internal_Rela *)); +static bfd_vma r_reloc_get_target_offset + PARAMS ((const r_reloc *)); +static asection *r_reloc_get_section + PARAMS ((const r_reloc *)); +static bfd_boolean r_reloc_is_defined + PARAMS ((const r_reloc *)); +static struct elf_link_hash_entry *r_reloc_get_hash_entry + PARAMS ((const r_reloc *)); + + +/* The r_reloc structure is included by value in literal_value, but not + every literal_value has an associated relocation -- some are simple + constants. In such cases, we set all the fields in the r_reloc + struct to zero. The r_reloc_is_const function should be used to + detect this case. */ + +static bfd_boolean +r_reloc_is_const (r_rel) + const r_reloc *r_rel; +{ + return (r_rel->abfd == NULL); +} + + +static void +r_reloc_init (r_rel, abfd, irel) + r_reloc *r_rel; + bfd *abfd; + Elf_Internal_Rela *irel; +{ + if (irel != NULL) + { + r_rel->rela = *irel; + r_rel->abfd = abfd; + r_rel->target_offset = r_reloc_get_target_offset (r_rel); + } + else + memset (r_rel, 0, sizeof (r_reloc)); +} + + +static bfd_vma +r_reloc_get_target_offset (r_rel) + const r_reloc *r_rel; +{ + bfd_vma target_offset; + unsigned long r_symndx; + + BFD_ASSERT (!r_reloc_is_const (r_rel)); + r_symndx = ELF32_R_SYM (r_rel->rela.r_info); + target_offset = get_elf_r_symndx_offset (r_rel->abfd, r_symndx); + return (target_offset + r_rel->rela.r_addend); +} + + +static struct elf_link_hash_entry * +r_reloc_get_hash_entry (r_rel) + const r_reloc *r_rel; +{ + unsigned long r_symndx = ELF32_R_SYM (r_rel->rela.r_info); + return get_elf_r_symndx_hash_entry (r_rel->abfd, r_symndx); +} + + +static asection * +r_reloc_get_section (r_rel) + const r_reloc *r_rel; +{ + unsigned long r_symndx = ELF32_R_SYM (r_rel->rela.r_info); + return get_elf_r_symndx_section (r_rel->abfd, r_symndx); +} + + +static bfd_boolean +r_reloc_is_defined (r_rel) + const r_reloc *r_rel; +{ + asection *sec = r_reloc_get_section (r_rel); + if (sec == bfd_abs_section_ptr + || sec == bfd_com_section_ptr + || sec == bfd_und_section_ptr) + return FALSE; + return TRUE; +} + + +/* source_reloc: relocations that reference literal sections. */ + +/* To determine whether literals can be coalesced, we need to first + record all the relocations that reference the literals. The + source_reloc structure below is used for this purpose. The + source_reloc entries are kept in a per-literal-section array, sorted + by offset within the literal section (i.e., target offset). + + The source_sec and r_rel.rela.r_offset fields identify the source of + the relocation. The r_rel field records the relocation value, i.e., + the offset of the literal being referenced. The opnd field is needed + to determine the range of the immediate field to which the relocation + applies, so we can determine whether another literal with the same + value is within range. The is_null field is true when the relocation + is being removed (e.g., when an L32R is being removed due to a CALLX + that is converted to a direct CALL). */ + +typedef struct source_reloc_struct source_reloc; + +struct source_reloc_struct +{ + asection *source_sec; + r_reloc r_rel; + xtensa_operand opnd; + bfd_boolean is_null; +}; + + +static void init_source_reloc + PARAMS ((source_reloc *, asection *, const r_reloc *, xtensa_operand)); +static source_reloc *find_source_reloc + PARAMS ((source_reloc *, int, asection *, Elf_Internal_Rela *)); +static int source_reloc_compare + PARAMS ((const PTR, const PTR)); + + +static void +init_source_reloc (reloc, source_sec, r_rel, opnd) + source_reloc *reloc; + asection *source_sec; + const r_reloc *r_rel; + xtensa_operand opnd; +{ + reloc->source_sec = source_sec; + reloc->r_rel = *r_rel; + reloc->opnd = opnd; + reloc->is_null = FALSE; +} + + +/* Find the source_reloc for a particular source offset and relocation + type. Note that the array is sorted by _target_ offset, so this is + just a linear search. */ + +static source_reloc * +find_source_reloc (src_relocs, src_count, sec, irel) + source_reloc *src_relocs; + int src_count; + asection *sec; + Elf_Internal_Rela *irel; +{ + int i; + + for (i = 0; i < src_count; i++) + { + if (src_relocs[i].source_sec == sec + && src_relocs[i].r_rel.rela.r_offset == irel->r_offset + && (ELF32_R_TYPE (src_relocs[i].r_rel.rela.r_info) + == ELF32_R_TYPE (irel->r_info))) + return &src_relocs[i]; + } + + return NULL; +} + + +static int +source_reloc_compare (ap, bp) + const PTR ap; + const PTR bp; +{ + const source_reloc *a = (const source_reloc *) ap; + const source_reloc *b = (const source_reloc *) bp; + + return (a->r_rel.target_offset - b->r_rel.target_offset); +} + + +/* Literal values and value hash tables. */ + +/* Literals with the same value can be coalesced. The literal_value + structure records the value of a literal: the "r_rel" field holds the + information from the relocation on the literal (if there is one) and + the "value" field holds the contents of the literal word itself. + + The value_map structure records a literal value along with the + location of a literal holding that value. The value_map hash table + is indexed by the literal value, so that we can quickly check if a + particular literal value has been seen before and is thus a candidate + for coalescing. */ + +typedef struct literal_value_struct literal_value; +typedef struct value_map_struct value_map; +typedef struct value_map_hash_table_struct value_map_hash_table; + +struct literal_value_struct +{ + r_reloc r_rel; + unsigned long value; +}; + +struct value_map_struct +{ + literal_value val; /* The literal value. */ + r_reloc loc; /* Location of the literal. */ + value_map *next; +}; + +struct value_map_hash_table_struct +{ + unsigned bucket_count; + value_map **buckets; + unsigned count; +}; + + +static bfd_boolean is_same_value + PARAMS ((const literal_value *, const literal_value *)); +static value_map_hash_table *value_map_hash_table_init + PARAMS ((void)); +static unsigned hash_literal_value + PARAMS ((const literal_value *)); +static unsigned hash_bfd_vma + PARAMS ((bfd_vma)); +static value_map *get_cached_value + PARAMS ((value_map_hash_table *, const literal_value *)); +static value_map *add_value_map + PARAMS ((value_map_hash_table *, const literal_value *, const r_reloc *)); + + +static bfd_boolean +is_same_value (src1, src2) + const literal_value *src1; + const literal_value *src2; +{ + if (r_reloc_is_const (&src1->r_rel) != r_reloc_is_const (&src2->r_rel)) + return FALSE; + + if (r_reloc_is_const (&src1->r_rel)) + return (src1->value == src2->value); + + if (ELF32_R_TYPE (src1->r_rel.rela.r_info) + != ELF32_R_TYPE (src2->r_rel.rela.r_info)) + return FALSE; + + if (r_reloc_get_target_offset (&src1->r_rel) + != r_reloc_get_target_offset (&src2->r_rel)) + return FALSE; + + if (src1->value != src2->value) + return FALSE; + + /* Now check for the same section and the same elf_hash. */ + if (r_reloc_is_defined (&src1->r_rel)) + { + if (r_reloc_get_section (&src1->r_rel) + != r_reloc_get_section (&src2->r_rel)) + return FALSE; + } + else + { + if (r_reloc_get_hash_entry (&src1->r_rel) + != r_reloc_get_hash_entry (&src2->r_rel)) + return FALSE; + + if (r_reloc_get_hash_entry (&src1->r_rel) == 0) + return FALSE; + } + + return TRUE; +} + + +/* Must be power of 2. */ +#define INITIAL_HASH_RELOC_BUCKET_COUNT 1024 + +static value_map_hash_table * +value_map_hash_table_init () +{ + value_map_hash_table *values; + + values = (value_map_hash_table *) + bfd_malloc (sizeof (value_map_hash_table)); + + values->bucket_count = INITIAL_HASH_RELOC_BUCKET_COUNT; + values->count = 0; + values->buckets = (value_map **) + bfd_zmalloc (sizeof (value_map *) * values->bucket_count); + + return values; +} + + +static unsigned +hash_bfd_vma (val) + bfd_vma val; +{ + return (val >> 2) + (val >> 10); +} + + +static unsigned +hash_literal_value (src) + const literal_value *src; +{ + unsigned hash_val; + if (r_reloc_is_const (&src->r_rel)) + return hash_bfd_vma (src->value); + + hash_val = (hash_bfd_vma (r_reloc_get_target_offset (&src->r_rel)) + + hash_bfd_vma (src->value)); + + /* Now check for the same section and the same elf_hash. */ + if (r_reloc_is_defined (&src->r_rel)) + hash_val += hash_bfd_vma ((bfd_vma) r_reloc_get_section (&src->r_rel)); + else + hash_val += hash_bfd_vma ((bfd_vma) r_reloc_get_hash_entry (&src->r_rel)); + + return hash_val; +} + + +/* Check if the specified literal_value has been seen before. */ + +static value_map * +get_cached_value (map, val) + value_map_hash_table *map; + const literal_value *val; +{ + value_map *map_e; + value_map *bucket; + unsigned idx; + + idx = hash_literal_value (val); + idx = idx & (map->bucket_count - 1); + bucket = map->buckets[idx]; + for (map_e = bucket; map_e; map_e = map_e->next) + { + if (is_same_value (&map_e->val, val)) + return map_e; + } + return NULL; +} + + +/* Record a new literal value. It is illegal to call this if VALUE + already has an entry here. */ + +static value_map * +add_value_map (map, val, loc) + value_map_hash_table *map; + const literal_value *val; + const r_reloc *loc; +{ + value_map **bucket_p; + unsigned idx; + + value_map *val_e = (value_map *) bfd_zmalloc (sizeof (value_map)); + + BFD_ASSERT (get_cached_value (map, val) == NULL); + val_e->val = *val; + val_e->loc = *loc; + + idx = hash_literal_value (val); + idx = idx & (map->bucket_count - 1); + bucket_p = &map->buckets[idx]; + + val_e->next = *bucket_p; + *bucket_p = val_e; + map->count++; + /* FIXME: consider resizing the hash table if we get too many entries */ + + return val_e; +} + + +/* Lists of literals being coalesced or removed. */ + +/* In the usual case, the literal identified by "from" is being + coalesced with another literal identified by "to". If the literal is + unused and is being removed altogether, "to.abfd" will be NULL. + The removed_literal entries are kept on a per-section list, sorted + by the "from" offset field. */ + +typedef struct removed_literal_struct removed_literal; +typedef struct removed_literal_list_struct removed_literal_list; + +struct removed_literal_struct +{ + r_reloc from; + r_reloc to; + removed_literal *next; +}; + +struct removed_literal_list_struct +{ + removed_literal *head; + removed_literal *tail; +}; + + +static void add_removed_literal + PARAMS ((removed_literal_list *, const r_reloc *, const r_reloc *)); +static removed_literal *find_removed_literal + PARAMS ((removed_literal_list *, bfd_vma)); +static bfd_vma offset_with_removed_literals + PARAMS ((removed_literal_list *, bfd_vma)); + + +/* Record that the literal at "from" is being removed. If "to" is not + NULL, the "from" literal is being coalesced with the "to" literal. */ + +static void +add_removed_literal (removed_list, from, to) + removed_literal_list *removed_list; + const r_reloc *from; + const r_reloc *to; +{ + removed_literal *r, *new_r, *next_r; + + new_r = (removed_literal *) bfd_zmalloc (sizeof (removed_literal)); + + new_r->from = *from; + if (to) + new_r->to = *to; + else + new_r->to.abfd = NULL; + new_r->next = NULL; + + r = removed_list->head; + if (r == NULL) + { + removed_list->head = new_r; + removed_list->tail = new_r; + } + /* Special check for common case of append. */ + else if (removed_list->tail->from.target_offset < from->target_offset) + { + removed_list->tail->next = new_r; + removed_list->tail = new_r; + } + else + { + while (r->from.target_offset < from->target_offset + && r->next != NULL) + { + r = r->next; + } + next_r = r->next; + r->next = new_r; + new_r->next = next_r; + if (next_r == NULL) + removed_list->tail = new_r; + } +} + + +/* Check if the list of removed literals contains an entry for the + given address. Return the entry if found. */ + +static removed_literal * +find_removed_literal (removed_list, addr) + removed_literal_list *removed_list; + bfd_vma addr; +{ + removed_literal *r = removed_list->head; + while (r && r->from.target_offset < addr) + r = r->next; + if (r && r->from.target_offset == addr) + return r; + return NULL; +} + + +/* Adjust an offset in a section to compensate for literals that are + being removed. Search the list of removed literals and subtract + 4 bytes for every removed literal prior to the given address. */ + +static bfd_vma +offset_with_removed_literals (removed_list, addr) + removed_literal_list *removed_list; + bfd_vma addr; +{ + removed_literal *r = removed_list->head; + unsigned num_bytes = 0; + + if (r == NULL) + return addr; + + while (r && r->from.target_offset <= addr) + { + num_bytes += 4; + r = r->next; + } + if (num_bytes > addr) + return 0; + return (addr - num_bytes); +} + + +/* Coalescing literals may require a relocation to refer to a section in + a different input file, but the standard relocation information + cannot express that. Instead, the reloc_bfd_fix structures are used + to "fix" the relocations that refer to sections in other input files. + These structures are kept on per-section lists. The "src_type" field + records the relocation type in case there are multiple relocations on + the same location. FIXME: This is ugly; an alternative might be to + add new symbols with the "owner" field to some other input file. */ + +typedef struct reloc_bfd_fix_struct reloc_bfd_fix; + +struct reloc_bfd_fix_struct +{ + asection *src_sec; + bfd_vma src_offset; + unsigned src_type; /* Relocation type. */ + + bfd *target_abfd; + asection *target_sec; + bfd_vma target_offset; + + reloc_bfd_fix *next; +}; + + +static reloc_bfd_fix *reloc_bfd_fix_init + PARAMS ((asection *, bfd_vma, unsigned, bfd *, asection *, bfd_vma)); +static reloc_bfd_fix *get_bfd_fix + PARAMS ((reloc_bfd_fix *, asection *, bfd_vma, unsigned)); + + +static reloc_bfd_fix * +reloc_bfd_fix_init (src_sec, src_offset, src_type, + target_abfd, target_sec, target_offset) + asection *src_sec; + bfd_vma src_offset; + unsigned src_type; + bfd *target_abfd; + asection *target_sec; + bfd_vma target_offset; +{ + reloc_bfd_fix *fix; + + fix = (reloc_bfd_fix *) bfd_malloc (sizeof (reloc_bfd_fix)); + fix->src_sec = src_sec; + fix->src_offset = src_offset; + fix->src_type = src_type; + fix->target_abfd = target_abfd; + fix->target_sec = target_sec; + fix->target_offset = target_offset; + + return fix; +} + + +static reloc_bfd_fix * +get_bfd_fix (fix_list, sec, offset, type) + reloc_bfd_fix *fix_list; + asection *sec; + bfd_vma offset; + unsigned type; +{ + reloc_bfd_fix *r; + + for (r = fix_list; r != NULL; r = r->next) + { + if (r->src_sec == sec + && r->src_offset == offset + && r->src_type == type) + return r; + } + return NULL; +} + + +/* Per-section data for relaxation. */ + +struct xtensa_relax_info_struct +{ + bfd_boolean is_relaxable_literal_section; + int visited; /* Number of times visited. */ + + source_reloc *src_relocs; /* Array[src_count]. */ + int src_count; + int src_next; /* Next src_relocs entry to assign. */ + + removed_literal_list removed_list; + + reloc_bfd_fix *fix_list; +}; + +struct elf_xtensa_section_data +{ + struct bfd_elf_section_data elf; + xtensa_relax_info relax_info; +}; + +static void init_xtensa_relax_info + PARAMS ((asection *)); +static xtensa_relax_info *get_xtensa_relax_info + PARAMS ((asection *)); +static void add_fix + PARAMS ((asection *, reloc_bfd_fix *)); + + +static bfd_boolean +elf_xtensa_new_section_hook (abfd, sec) + bfd *abfd; + asection *sec; +{ + struct elf_xtensa_section_data *sdata; + bfd_size_type amt = sizeof (*sdata); + + sdata = (struct elf_xtensa_section_data *) bfd_zalloc (abfd, amt); + if (sdata == NULL) + return FALSE; + sec->used_by_bfd = (PTR) sdata; + + return _bfd_elf_new_section_hook (abfd, sec); +} + + +static void +init_xtensa_relax_info (sec) + asection *sec; +{ + xtensa_relax_info *relax_info = get_xtensa_relax_info (sec); + + relax_info->is_relaxable_literal_section = FALSE; + relax_info->visited = 0; + + relax_info->src_relocs = NULL; + relax_info->src_count = 0; + relax_info->src_next = 0; + + relax_info->removed_list.head = NULL; + relax_info->removed_list.tail = NULL; + + relax_info->fix_list = NULL; +} + + +static xtensa_relax_info * +get_xtensa_relax_info (sec) + asection *sec; +{ + struct elf_xtensa_section_data *section_data; + + /* No info available if no section or if it is an output section. */ + if (!sec || sec == sec->output_section) + return NULL; + + section_data = (struct elf_xtensa_section_data *) elf_section_data (sec); + return §ion_data->relax_info; +} + + +static void +add_fix (src_sec, fix) + asection *src_sec; + reloc_bfd_fix *fix; +{ + xtensa_relax_info *relax_info; + + relax_info = get_xtensa_relax_info (src_sec); + fix->next = relax_info->fix_list; + relax_info->fix_list = fix; +} + + +/* Access to internal relocations, section contents and symbols. */ + +/* During relaxation, we need to modify relocations, section contents, + and symbol definitions, and we need to keep the original values from + being reloaded from the input files, i.e., we need to "pin" the + modified values in memory. We also want to continue to observe the + setting of the "keep-memory" flag. The following functions wrap the + standard BFD functions to take care of this for us. */ + +static Elf_Internal_Rela * +retrieve_internal_relocs (abfd, sec, keep_memory) + bfd *abfd; + asection *sec; + bfd_boolean keep_memory; +{ + Elf_Internal_Rela *internal_relocs; + + if ((sec->flags & SEC_LINKER_CREATED) != 0) + return NULL; + + internal_relocs = elf_section_data (sec)->relocs; + if (internal_relocs == NULL) + internal_relocs = (_bfd_elf32_link_read_relocs + (abfd, sec, (PTR) NULL, (Elf_Internal_Rela *) NULL, + keep_memory)); + return internal_relocs; +} + + +static void +pin_internal_relocs (sec, internal_relocs) + asection *sec; + Elf_Internal_Rela *internal_relocs; +{ + elf_section_data (sec)->relocs = internal_relocs; +} + + +static void +release_internal_relocs (sec, internal_relocs) + asection *sec; + Elf_Internal_Rela *internal_relocs; +{ + if (internal_relocs + && elf_section_data (sec)->relocs != internal_relocs) + free (internal_relocs); +} + + +static bfd_byte * +retrieve_contents (abfd, sec, keep_memory) + bfd *abfd; + asection *sec; + bfd_boolean keep_memory; +{ + bfd_byte *contents; + + contents = elf_section_data (sec)->this_hdr.contents; + + if (contents == NULL && sec->_raw_size != 0) + { + contents = (bfd_byte *) bfd_malloc (sec->_raw_size); + if (contents != NULL) + { + if (! bfd_get_section_contents (abfd, sec, contents, + (file_ptr) 0, sec->_raw_size)) + { + free (contents); + return NULL; + } + if (keep_memory) + elf_section_data (sec)->this_hdr.contents = contents; + } + } + return contents; +} + + +static void +pin_contents (sec, contents) + asection *sec; + bfd_byte *contents; +{ + elf_section_data (sec)->this_hdr.contents = contents; +} + + +static void +release_contents (sec, contents) + asection *sec; + bfd_byte *contents; +{ + if (contents && + elf_section_data (sec)->this_hdr.contents != contents) + free (contents); +} + + +static Elf_Internal_Sym * +retrieve_local_syms (input_bfd) + bfd *input_bfd; +{ + Elf_Internal_Shdr *symtab_hdr; + Elf_Internal_Sym *isymbuf; + size_t locsymcount; + + symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; + locsymcount = symtab_hdr->sh_info; + + isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; + if (isymbuf == NULL && locsymcount != 0) + isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, locsymcount, 0, + NULL, NULL, NULL); + + /* Save the symbols for this input file so they won't be read again. */ + if (isymbuf && isymbuf != (Elf_Internal_Sym *) symtab_hdr->contents) + symtab_hdr->contents = (unsigned char *) isymbuf; + + return isymbuf; +} + + +/* Code for link-time relaxation. */ + +/* Local helper functions. */ +static bfd_boolean analyze_relocations + PARAMS ((struct bfd_link_info *)); +static bfd_boolean find_relaxable_sections + PARAMS ((bfd *, asection *, struct bfd_link_info *, bfd_boolean *)); +static bfd_boolean collect_source_relocs + PARAMS ((bfd *, asection *, struct bfd_link_info *)); +static bfd_boolean is_resolvable_asm_expansion + PARAMS ((bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, + struct bfd_link_info *, bfd_boolean *)); +static bfd_boolean remove_literals + PARAMS ((bfd *, asection *, struct bfd_link_info *, value_map_hash_table *)); +static bfd_boolean relax_section + PARAMS ((bfd *, asection *, struct bfd_link_info *)); +static bfd_boolean relax_property_section + PARAMS ((bfd *, asection *, struct bfd_link_info *)); +static bfd_boolean relax_section_symbols + PARAMS ((bfd *, asection *)); +static bfd_boolean relocations_reach + PARAMS ((source_reloc *, int, const r_reloc *)); +static void translate_reloc + PARAMS ((const r_reloc *, r_reloc *)); +static Elf_Internal_Rela *get_irel_at_offset + PARAMS ((asection *, Elf_Internal_Rela *, bfd_vma)); +static Elf_Internal_Rela *find_associated_l32r_irel + PARAMS ((asection *, bfd_byte *, Elf_Internal_Rela *, + Elf_Internal_Rela *)); +static void shrink_dynamic_reloc_sections + PARAMS ((struct bfd_link_info *, bfd *, asection *, Elf_Internal_Rela *)); + + +static bfd_boolean +elf_xtensa_relax_section (abfd, sec, link_info, again) + bfd *abfd; + asection *sec; + struct bfd_link_info *link_info; + bfd_boolean *again; +{ + static value_map_hash_table *values = NULL; + xtensa_relax_info *relax_info; + + if (!values) + { + /* Do some overall initialization for relaxation. */ + values = value_map_hash_table_init (); + relaxing_section = TRUE; + if (!analyze_relocations (link_info)) + return FALSE; + } + *again = FALSE; + + /* Don't mess with linker-created sections. */ + if ((sec->flags & SEC_LINKER_CREATED) != 0) + return TRUE; + + relax_info = get_xtensa_relax_info (sec); + BFD_ASSERT (relax_info != NULL); + + switch (relax_info->visited) + { + case 0: + /* Note: It would be nice to fold this pass into + analyze_relocations, but it is important for this step that the + sections be examined in link order. */ + if (!remove_literals (abfd, sec, link_info, values)) + return FALSE; + *again = TRUE; + break; + + case 1: + if (!relax_section (abfd, sec, link_info)) + return FALSE; + *again = TRUE; + break; + + case 2: + if (!relax_section_symbols (abfd, sec)) + return FALSE; + break; + } + + relax_info->visited++; + return TRUE; +} + +/* Initialization for relaxation. */ + +/* This function is called once at the start of relaxation. It scans + all the input sections and marks the ones that are relaxable (i.e., + literal sections with L32R relocations against them). It then + collect source_reloc information for all the relocations against + those relaxable sections. */ + +static bfd_boolean +analyze_relocations (link_info) + struct bfd_link_info *link_info; +{ + bfd *abfd; + asection *sec; + bfd_boolean is_relaxable = FALSE; + + /* Initialize the per-section relaxation info. */ + for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next) + for (sec = abfd->sections; sec != NULL; sec = sec->next) + { + init_xtensa_relax_info (sec); + } + + /* Mark relaxable sections (and count relocations against each one). */ + for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next) + for (sec = abfd->sections; sec != NULL; sec = sec->next) + { + if (!find_relaxable_sections (abfd, sec, link_info, &is_relaxable)) + return FALSE; + } + + /* Bail out if there are no relaxable sections. */ + if (!is_relaxable) + return TRUE; + + /* Allocate space for source_relocs. */ + for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next) + for (sec = abfd->sections; sec != NULL; sec = sec->next) + { + xtensa_relax_info *relax_info; + + relax_info = get_xtensa_relax_info (sec); + if (relax_info->is_relaxable_literal_section) + { + relax_info->src_relocs = (source_reloc *) + bfd_malloc (relax_info->src_count * sizeof (source_reloc)); + } + } + + /* Collect info on relocations against each relaxable section. */ + for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next) + for (sec = abfd->sections; sec != NULL; sec = sec->next) + { + if (!collect_source_relocs (abfd, sec, link_info)) + return FALSE; + } + + return TRUE; +} + + +/* Find all the literal sections that might be relaxed. The motivation + for this pass is that collect_source_relocs() needs to record _all_ + the relocations that target each relaxable section. That is + expensive and unnecessary unless the target section is actually going + to be relaxed. This pass identifies all such sections by checking if + they have L32Rs pointing to them. In the process, the total number + of relocations targetting each section is also counted so that we + know how much space to allocate for source_relocs against each + relaxable literal section. */ + +static bfd_boolean +find_relaxable_sections (abfd, sec, link_info, is_relaxable_p) + bfd *abfd; + asection *sec; + struct bfd_link_info *link_info; + bfd_boolean *is_relaxable_p; +{ + Elf_Internal_Rela *internal_relocs; + bfd_byte *contents; + bfd_boolean ok = TRUE; + unsigned i; + + internal_relocs = retrieve_internal_relocs (abfd, sec, + link_info->keep_memory); + if (internal_relocs == NULL) + return ok; + + contents = retrieve_contents (abfd, sec, link_info->keep_memory); + if (contents == NULL && sec->_raw_size != 0) + { + ok = FALSE; + goto error_return; + } + + for (i = 0; i < sec->reloc_count; i++) + { + Elf_Internal_Rela *irel = &internal_relocs[i]; + r_reloc r_rel; + asection *target_sec; + xtensa_relax_info *target_relax_info; + + r_reloc_init (&r_rel, abfd, irel); + + target_sec = r_reloc_get_section (&r_rel); + target_relax_info = get_xtensa_relax_info (target_sec); + if (!target_relax_info) + continue; + + /* Count relocations against the target section. */ + target_relax_info->src_count++; + + if (is_literal_section (target_sec) + && is_l32r_relocation (sec, contents, irel) + && r_reloc_is_defined (&r_rel)) + { + /* Mark the target section as relaxable. */ + target_relax_info->is_relaxable_literal_section = TRUE; + *is_relaxable_p = TRUE; + } + } + + error_return: + release_contents (sec, contents); + release_internal_relocs (sec, internal_relocs); + return ok; +} + + +/* Record _all_ the relocations that point to relaxable literal + sections, and get rid of ASM_EXPAND relocs by either converting them + to ASM_SIMPLIFY or by removing them. */ + +static bfd_boolean +collect_source_relocs (abfd, sec, link_info) + bfd *abfd; + asection *sec; + struct bfd_link_info *link_info; +{ + Elf_Internal_Rela *internal_relocs; + bfd_byte *contents; + bfd_boolean ok = TRUE; + unsigned i; + + internal_relocs = retrieve_internal_relocs (abfd, sec, + link_info->keep_memory); + if (internal_relocs == NULL) + return ok; + + contents = retrieve_contents (abfd, sec, link_info->keep_memory); + if (contents == NULL && sec->_raw_size != 0) + { + ok = FALSE; + goto error_return; + } + + /* Record relocations against relaxable literal sections. */ + for (i = 0; i < sec->reloc_count; i++) + { + Elf_Internal_Rela *irel = &internal_relocs[i]; + r_reloc r_rel; + asection *target_sec; + xtensa_relax_info *target_relax_info; + + r_reloc_init (&r_rel, abfd, irel); + + target_sec = r_reloc_get_section (&r_rel); + target_relax_info = get_xtensa_relax_info (target_sec); + + if (target_relax_info + && target_relax_info->is_relaxable_literal_section) + { + xtensa_opcode opcode; + xtensa_operand opnd; + source_reloc *s_reloc; + int src_next; + + src_next = target_relax_info->src_next++; + s_reloc = &target_relax_info->src_relocs[src_next]; + + opcode = get_relocation_opcode (sec, contents, irel); + if (opcode == XTENSA_UNDEFINED) + opnd = NULL; + else + opnd = xtensa_get_operand (xtensa_default_isa, opcode, + get_relocation_opnd (irel)); + + init_source_reloc (s_reloc, sec, &r_rel, opnd); + } + } + + /* Now get rid of ASM_EXPAND relocations. At this point, the + src_relocs array for the target literal section may still be + incomplete, but it must at least contain the entries for the L32R + relocations associated with ASM_EXPANDs because they were just + added in the preceding loop over the relocations. */ + + for (i = 0; i < sec->reloc_count; i++) + { + Elf_Internal_Rela *irel = &internal_relocs[i]; + bfd_boolean is_reachable; + + if (!is_resolvable_asm_expansion (abfd, sec, contents, irel, link_info, + &is_reachable)) + continue; + + if (is_reachable) + { + Elf_Internal_Rela *l32r_irel; + r_reloc r_rel; + asection *target_sec; + xtensa_relax_info *target_relax_info; + + /* Mark the source_reloc for the L32R so that it will be + removed in remove_literals(), along with the associated + literal. */ + l32r_irel = find_associated_l32r_irel (sec, contents, + irel, internal_relocs); + if (l32r_irel == NULL) + continue; + + r_reloc_init (&r_rel, abfd, l32r_irel); + + target_sec = r_reloc_get_section (&r_rel); + target_relax_info = get_xtensa_relax_info (target_sec); + + if (target_relax_info + && target_relax_info->is_relaxable_literal_section) + { + source_reloc *s_reloc; + + /* Search the source_relocs for the entry corresponding to + the l32r_irel. Note: The src_relocs array is not yet + sorted, but it wouldn't matter anyway because we're + searching by source offset instead of target offset. */ + s_reloc = find_source_reloc (target_relax_info->src_relocs, + target_relax_info->src_next, + sec, l32r_irel); + BFD_ASSERT (s_reloc); + s_reloc->is_null = TRUE; + } + + /* Convert this reloc to ASM_SIMPLIFY. */ + irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), + R_XTENSA_ASM_SIMPLIFY); + l32r_irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE); + + pin_internal_relocs (sec, internal_relocs); + } + else + { + /* It is resolvable but doesn't reach. We resolve now + by eliminating the relocation -- the call will remain + expanded into L32R/CALLX. */ + irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE); + pin_internal_relocs (sec, internal_relocs); + } + } + + error_return: + release_contents (sec, contents); + release_internal_relocs (sec, internal_relocs); + return ok; +} + + +/* Return TRUE if the asm expansion can be resolved. Generally it can + be resolved on a final link or when a partial link locates it in the + same section as the target. Set "is_reachable" flag if the target of + the call is within the range of a direct call, given the current VMA + for this section and the target section. */ + +bfd_boolean +is_resolvable_asm_expansion (abfd, sec, contents, irel, link_info, + is_reachable_p) + bfd *abfd; + asection *sec; + bfd_byte *contents; + Elf_Internal_Rela *irel; + struct bfd_link_info *link_info; + bfd_boolean *is_reachable_p; +{ + asection *target_sec; + bfd_vma target_offset; + r_reloc r_rel; + xtensa_opcode opcode, direct_call_opcode; + bfd_vma self_address; + bfd_vma dest_address; + + *is_reachable_p = FALSE; + + if (contents == NULL) + return FALSE; + + if (ELF32_R_TYPE (irel->r_info) != R_XTENSA_ASM_EXPAND) + return FALSE; + + opcode = get_expanded_call_opcode (contents + irel->r_offset, + sec->_raw_size - irel->r_offset); + + direct_call_opcode = swap_callx_for_call_opcode (opcode); + if (direct_call_opcode == XTENSA_UNDEFINED) + return FALSE; + + /* Check and see that the target resolves. */ + r_reloc_init (&r_rel, abfd, irel); + if (!r_reloc_is_defined (&r_rel)) + return FALSE; + + target_sec = r_reloc_get_section (&r_rel); + target_offset = r_reloc_get_target_offset (&r_rel); + + /* If the target is in a shared library, then it doesn't reach. This + isn't supposed to come up because the compiler should never generate + non-PIC calls on systems that use shared libraries, but the linker + shouldn't crash regardless. */ + if (!target_sec->output_section) + return FALSE; + + /* For relocateable sections, we can only simplify when the output + section of the target is the same as the output section of the + source. */ + if (link_info->relocateable + && (target_sec->output_section != sec->output_section)) + return FALSE; + + self_address = (sec->output_section->vma + + sec->output_offset + irel->r_offset + 3); + dest_address = (target_sec->output_section->vma + + target_sec->output_offset + target_offset); + + *is_reachable_p = pcrel_reloc_fits + (xtensa_get_operand (xtensa_default_isa, direct_call_opcode, 0), + self_address, dest_address); + + if ((self_address >> CALL_SEGMENT_BITS) != + (dest_address >> CALL_SEGMENT_BITS)) + return FALSE; + + return TRUE; +} + + +static Elf_Internal_Rela * +find_associated_l32r_irel (sec, contents, other_irel, internal_relocs) + asection *sec; + bfd_byte *contents; + Elf_Internal_Rela *other_irel; + Elf_Internal_Rela *internal_relocs; +{ + unsigned i; + + for (i = 0; i < sec->reloc_count; i++) + { + Elf_Internal_Rela *irel = &internal_relocs[i]; + + if (irel == other_irel) + continue; + if (irel->r_offset != other_irel->r_offset) + continue; + if (is_l32r_relocation (sec, contents, irel)) + return irel; + } + + return NULL; +} + +/* First relaxation pass. */ + +/* If the section is relaxable (i.e., a literal section), check each + literal to see if it has the same value as another literal that has + already been seen, either in the current section or a previous one. + If so, add an entry to the per-section list of removed literals. The + actual changes are deferred until the next pass. */ + +static bfd_boolean +remove_literals (abfd, sec, link_info, values) + bfd *abfd; + asection *sec; + struct bfd_link_info *link_info; + value_map_hash_table *values; +{ + xtensa_relax_info *relax_info; + bfd_byte *contents; + Elf_Internal_Rela *internal_relocs; + source_reloc *src_relocs; + bfd_boolean ok = TRUE; + int i; + + /* Do nothing if it is not a relaxable literal section. */ + relax_info = get_xtensa_relax_info (sec); + BFD_ASSERT (relax_info); + + if (!relax_info->is_relaxable_literal_section) + return ok; + + internal_relocs = retrieve_internal_relocs (abfd, sec, + link_info->keep_memory); + + contents = retrieve_contents (abfd, sec, link_info->keep_memory); + if (contents == NULL && sec->_raw_size != 0) + { + ok = FALSE; + goto error_return; + } + + /* Sort the source_relocs by target offset. */ + src_relocs = relax_info->src_relocs; + qsort (src_relocs, relax_info->src_count, + sizeof (source_reloc), source_reloc_compare); + + for (i = 0; i < relax_info->src_count; i++) + { + source_reloc *rel; + Elf_Internal_Rela *irel = NULL; + literal_value val; + value_map *val_map; + + rel = &src_relocs[i]; + irel = get_irel_at_offset (sec, internal_relocs, + rel->r_rel.target_offset); + + /* If the target_offset for this relocation is the same as the + previous relocation, then we've already considered whether the + literal can be coalesced. Skip to the next one.... */ + if (i != 0 && (src_relocs[i-1].r_rel.target_offset + == rel->r_rel.target_offset)) + continue; + + /* Check if the relocation was from an L32R that is being removed + because a CALLX was converted to a direct CALL, and check if + there are no other relocations to the literal. */ + if (rel->is_null + && (i == relax_info->src_count - 1 + || (src_relocs[i+1].r_rel.target_offset + != rel->r_rel.target_offset))) + { + /* Mark the unused literal so that it will be removed. */ + add_removed_literal (&relax_info->removed_list, &rel->r_rel, NULL); + + /* Zero out the relocation on this literal location. */ + if (irel) + { + if (elf_hash_table (link_info)->dynamic_sections_created) + shrink_dynamic_reloc_sections (link_info, abfd, sec, irel); + + irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE); + } + + continue; + } + + /* Find the literal value. */ + r_reloc_init (&val.r_rel, abfd, irel); + BFD_ASSERT (rel->r_rel.target_offset < sec->_raw_size); + val.value = bfd_get_32 (abfd, contents + rel->r_rel.target_offset); + + /* Check if we've seen another literal with the same value. */ + val_map = get_cached_value (values, &val); + if (val_map != NULL) + { + /* First check that THIS and all the other relocs to this + literal will FIT if we move them to the new address. */ + + if (relocations_reach (rel, relax_info->src_count - i, + &val_map->loc)) + { + /* Mark that the literal will be coalesced. */ + add_removed_literal (&relax_info->removed_list, + &rel->r_rel, &val_map->loc); + } + else + { + /* Relocations do not reach -- do not remove this literal. */ + val_map->loc = rel->r_rel; + } + } + else + { + /* This is the first time we've seen this literal value. */ + BFD_ASSERT (sec == r_reloc_get_section (&rel->r_rel)); + add_value_map (values, &val, &rel->r_rel); + } + } + +error_return: + release_contents (sec, contents); + release_internal_relocs (sec, internal_relocs); + return ok; +} + + +/* Check if the original relocations (presumably on L32R instructions) + identified by reloc[0..N] can be changed to reference the literal + identified by r_rel. If r_rel is out of range for any of the + original relocations, then we don't want to coalesce the original + literal with the one at r_rel. We only check reloc[0..N], where the + offsets are all the same as for reloc[0] (i.e., they're all + referencing the same literal) and where N is also bounded by the + number of remaining entries in the "reloc" array. The "reloc" array + is sorted by target offset so we know all the entries for the same + literal will be contiguous. */ + +static bfd_boolean +relocations_reach (reloc, remaining_relocs, r_rel) + source_reloc *reloc; + int remaining_relocs; + const r_reloc *r_rel; +{ + bfd_vma from_offset, source_address, dest_address; + asection *sec; + int i; + + if (!r_reloc_is_defined (r_rel)) + return FALSE; + + sec = r_reloc_get_section (r_rel); + from_offset = reloc[0].r_rel.target_offset; + + for (i = 0; i < remaining_relocs; i++) + { + if (reloc[i].r_rel.target_offset != from_offset) + break; + + /* Ignore relocations that have been removed. */ + if (reloc[i].is_null) + continue; + + /* The original and new output section for these must be the same + in order to coalesce. */ + if (r_reloc_get_section (&reloc[i].r_rel)->output_section + != sec->output_section) + return FALSE; + + /* A NULL operand means it is not a PC-relative relocation, so + the literal can be moved anywhere. */ + if (reloc[i].opnd) + { + /* Otherwise, check to see that it fits. */ + source_address = (reloc[i].source_sec->output_section->vma + + reloc[i].source_sec->output_offset + + reloc[i].r_rel.rela.r_offset); + dest_address = (sec->output_section->vma + + sec->output_offset + + r_rel->target_offset); + + if (!pcrel_reloc_fits (reloc[i].opnd, source_address, dest_address)) + return FALSE; + } + } + + return TRUE; +} + + +/* WARNING: linear search here. If the relocation are in order by + address, we can use a faster binary search. ALSO, we assume that + there is only 1 non-NONE relocation per address. */ + +static Elf_Internal_Rela * +get_irel_at_offset (sec, internal_relocs, offset) + asection *sec; + Elf_Internal_Rela *internal_relocs; + bfd_vma offset; +{ + unsigned i; + if (!internal_relocs) + return NULL; + for (i = 0; i < sec->reloc_count; i++) + { + Elf_Internal_Rela *irel = &internal_relocs[i]; + if (irel->r_offset == offset + && ELF32_R_TYPE (irel->r_info) != R_XTENSA_NONE) + return irel; + } + return NULL; +} + + +/* Second relaxation pass. */ + +/* Modify all of the relocations to point to the right spot, and if this + is a relaxable section, delete the unwanted literals and fix the + cooked_size. */ + +bfd_boolean +relax_section (abfd, sec, link_info) + bfd *abfd; + asection *sec; + struct bfd_link_info *link_info; +{ + Elf_Internal_Rela *internal_relocs; + xtensa_relax_info *relax_info; + bfd_byte *contents; + bfd_boolean ok = TRUE; + unsigned i; + + relax_info = get_xtensa_relax_info (sec); + BFD_ASSERT (relax_info); + + /* Handle property sections (e.g., literal tables) specially. */ + if (xtensa_is_property_section (sec)) + { + BFD_ASSERT (!relax_info->is_relaxable_literal_section); + return relax_property_section (abfd, sec, link_info); + } + + internal_relocs = retrieve_internal_relocs (abfd, sec, + link_info->keep_memory); + contents = retrieve_contents (abfd, sec, link_info->keep_memory); + if (contents == NULL && sec->_raw_size != 0) + { + ok = FALSE; + goto error_return; + } + + if (internal_relocs) + { + for (i = 0; i < sec->reloc_count; i++) + { + Elf_Internal_Rela *irel; + xtensa_relax_info *target_relax_info; + bfd_vma source_offset; + r_reloc r_rel; + unsigned r_type; + asection *target_sec; + + /* Locally change the source address. + Translate the target to the new target address. + If it points to this section and has been removed, + NULLify it. + Write it back. */ + + irel = &internal_relocs[i]; + source_offset = irel->r_offset; + + r_type = ELF32_R_TYPE (irel->r_info); + r_reloc_init (&r_rel, abfd, irel); + + if (relax_info->is_relaxable_literal_section) + { + if (r_type != R_XTENSA_NONE + && find_removed_literal (&relax_info->removed_list, + irel->r_offset)) + { + /* Remove this relocation. */ + if (elf_hash_table (link_info)->dynamic_sections_created) + shrink_dynamic_reloc_sections (link_info, abfd, sec, irel); + irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE); + irel->r_offset = offset_with_removed_literals + (&relax_info->removed_list, irel->r_offset); + continue; + } + source_offset = + offset_with_removed_literals (&relax_info->removed_list, + irel->r_offset); + irel->r_offset = source_offset; + } + + target_sec = r_reloc_get_section (&r_rel); + target_relax_info = get_xtensa_relax_info (target_sec); + + if (target_relax_info + && target_relax_info->is_relaxable_literal_section) + { + r_reloc new_rel; + reloc_bfd_fix *fix; + + translate_reloc (&r_rel, &new_rel); + + /* FIXME: If the relocation still references a section in + the same input file, the relocation should be modified + directly instead of adding a "fix" record. */ + + fix = reloc_bfd_fix_init (sec, source_offset, r_type, 0, + r_reloc_get_section (&new_rel), + new_rel.target_offset); + add_fix (sec, fix); + } + + pin_internal_relocs (sec, internal_relocs); + } + } + + if (relax_info->is_relaxable_literal_section) + { + /* Walk through the contents and delete literals that are not needed + anymore. */ + + unsigned long size = sec->_cooked_size; + unsigned long removed = 0; + + removed_literal *reloc = relax_info->removed_list.head; + for (; reloc; reloc = reloc->next) + { + unsigned long upper = sec->_raw_size; + bfd_vma start = reloc->from.target_offset + 4; + if (reloc->next) + upper = reloc->next->from.target_offset; + if (upper - start != 0) + { + BFD_ASSERT (start <= upper); + memmove (contents + start - removed - 4, + contents + start, + upper - start ); + pin_contents (sec, contents); + } + removed += 4; + size -= 4; + } + + /* Change the section size. */ + sec->_cooked_size = size; + /* Also shrink _raw_size. (The code in relocate_section that + checks that relocations are within the section must use + _raw_size because of the way the stabs sections are relaxed; + shrinking _raw_size means that these checks will not be + unnecessarily lax.) */ + sec->_raw_size = size; + } + + error_return: + release_internal_relocs (sec, internal_relocs); + release_contents (sec, contents); + return ok; +} + + +/* Fix up a relocation to take account of removed literals. */ + +static void +translate_reloc (orig_rel, new_rel) + const r_reloc *orig_rel; + r_reloc *new_rel; +{ + asection *sec; + xtensa_relax_info *relax_info; + removed_literal *removed; + unsigned long new_offset; + + *new_rel = *orig_rel; + + if (!r_reloc_is_defined (orig_rel)) + return; + sec = r_reloc_get_section (orig_rel); + + relax_info = get_xtensa_relax_info (sec); + BFD_ASSERT (relax_info); + + if (!relax_info->is_relaxable_literal_section) + return; + + /* Check if the original relocation is against a literal being removed. */ + removed = find_removed_literal (&relax_info->removed_list, + orig_rel->target_offset); + if (removed) + { + asection *new_sec; + + /* The fact that there is still a relocation to this literal indicates + that the literal is being coalesced, not simply removed. */ + BFD_ASSERT (removed->to.abfd != NULL); + + /* This was moved to some other address (possibly in another section). */ + *new_rel = removed->to; + new_sec = r_reloc_get_section (new_rel); + if (new_sec != sec) + { + sec = new_sec; + relax_info = get_xtensa_relax_info (sec); + if (!relax_info || !relax_info->is_relaxable_literal_section) + return; + } + } + + /* ...and the target address may have been moved within its section. */ + new_offset = offset_with_removed_literals (&relax_info->removed_list, + new_rel->target_offset); + + /* Modify the offset and addend. */ + new_rel->target_offset = new_offset; + new_rel->rela.r_addend += (new_offset - new_rel->target_offset); +} + + +/* For dynamic links, there may be a dynamic relocation for each + literal. The number of dynamic relocations must be computed in + size_dynamic_sections, which occurs before relaxation. When a + literal is removed, this function checks if there is a corresponding + dynamic relocation and shrinks the size of the appropriate dynamic + relocation section accordingly. At this point, the contents of the + dynamic relocation sections have not yet been filled in, so there's + nothing else that needs to be done. */ + +static void +shrink_dynamic_reloc_sections (info, abfd, input_section, rel) + struct bfd_link_info *info; + bfd *abfd; + asection *input_section; + Elf_Internal_Rela *rel; +{ + Elf_Internal_Shdr *symtab_hdr; + struct elf_link_hash_entry **sym_hashes; + unsigned long r_symndx; + int r_type; + struct elf_link_hash_entry *h; + bfd_boolean dynamic_symbol; + + symtab_hdr = &elf_tdata (abfd)->symtab_hdr; + sym_hashes = elf_sym_hashes (abfd); + + r_type = ELF32_R_TYPE (rel->r_info); + r_symndx = ELF32_R_SYM (rel->r_info); + + if (r_symndx < symtab_hdr->sh_info) + h = NULL; + else + h = sym_hashes[r_symndx - symtab_hdr->sh_info]; + + dynamic_symbol = xtensa_elf_dynamic_symbol_p (info, h); + + if ((r_type == R_XTENSA_32 || r_type == R_XTENSA_PLT) + && (input_section->flags & SEC_ALLOC) != 0 + && (dynamic_symbol || info->shared)) + { + bfd *dynobj; + const char *srel_name; + asection *srel; + bfd_boolean is_plt = FALSE; + + dynobj = elf_hash_table (info)->dynobj; + BFD_ASSERT (dynobj != NULL); + + if (dynamic_symbol && r_type == R_XTENSA_PLT) + { + srel_name = ".rela.plt"; + is_plt = TRUE; + } + else + srel_name = ".rela.got"; + + /* Reduce size of the .rela.* section by one reloc. */ + srel = bfd_get_section_by_name (dynobj, srel_name); + BFD_ASSERT (srel != NULL); + BFD_ASSERT (srel->_cooked_size >= sizeof (Elf32_External_Rela)); + srel->_cooked_size -= sizeof (Elf32_External_Rela); + + /* Also shrink _raw_size. (This seems wrong but other bfd code seems + to assume that linker-created sections will never be relaxed and + hence _raw_size must always equal _cooked_size.) */ + srel->_raw_size = srel->_cooked_size; + + if (is_plt) + { + asection *splt, *sgotplt, *srelgot; + int reloc_index, chunk; + + /* Find the PLT reloc index of the entry being removed. This + is computed from the size of ".rela.plt". It is needed to + figure out which PLT chunk to resize. Usually "last index + = size - 1" since the index starts at zero, but in this + context, the size has just been decremented so there's no + need to subtract one. */ + reloc_index = srel->_cooked_size / sizeof (Elf32_External_Rela); + + chunk = reloc_index / PLT_ENTRIES_PER_CHUNK; + splt = elf_xtensa_get_plt_section (dynobj, chunk); + sgotplt = elf_xtensa_get_gotplt_section (dynobj, chunk); + BFD_ASSERT (splt != NULL && sgotplt != NULL); + + /* Check if an entire PLT chunk has just been eliminated. */ + if (reloc_index % PLT_ENTRIES_PER_CHUNK == 0) + { + /* The two magic GOT entries for that chunk can go away. */ + srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); + BFD_ASSERT (srelgot != NULL); + srelgot->reloc_count -= 2; + srelgot->_cooked_size -= 2 * sizeof (Elf32_External_Rela); + /* Shrink _raw_size (see comment above). */ + srelgot->_raw_size = srelgot->_cooked_size; + + sgotplt->_cooked_size -= 8; + + /* There should be only one entry left (and it will be + removed below). */ + BFD_ASSERT (sgotplt->_cooked_size == 4); + BFD_ASSERT (splt->_cooked_size == PLT_ENTRY_SIZE); + } + + BFD_ASSERT (sgotplt->_cooked_size >= 4); + BFD_ASSERT (splt->_cooked_size >= PLT_ENTRY_SIZE); + + sgotplt->_cooked_size -= 4; + splt->_cooked_size -= PLT_ENTRY_SIZE; + + /* Shrink _raw_sizes (see comment above). */ + sgotplt->_raw_size = sgotplt->_cooked_size; + splt->_raw_size = splt->_cooked_size; + } + } +} + + +/* This is similar to relax_section except that when a target is moved, + we shift addresses up. We also need to modify the size. This + algorithm does NOT allow for relocations into the middle of the + property sections. */ + +static bfd_boolean +relax_property_section (abfd, sec, link_info) + bfd *abfd; + asection *sec; + struct bfd_link_info *link_info; +{ + Elf_Internal_Rela *internal_relocs; + bfd_byte *contents; + unsigned i, nexti; + bfd_boolean ok = TRUE; + + internal_relocs = retrieve_internal_relocs (abfd, sec, + link_info->keep_memory); + contents = retrieve_contents (abfd, sec, link_info->keep_memory); + if (contents == NULL && sec->_raw_size != 0) + { + ok = FALSE; + goto error_return; + } + + if (internal_relocs) + { + for (i = 0; i < sec->reloc_count; i++) + { + Elf_Internal_Rela *irel; + xtensa_relax_info *target_relax_info; + r_reloc r_rel; + unsigned r_type; + asection *target_sec; + + /* Locally change the source address. + Translate the target to the new target address. + If it points to this section and has been removed, MOVE IT. + Also, don't forget to modify the associated SIZE at + (offset + 4). */ + + irel = &internal_relocs[i]; + r_type = ELF32_R_TYPE (irel->r_info); + if (r_type == R_XTENSA_NONE) + continue; + + r_reloc_init (&r_rel, abfd, irel); + + target_sec = r_reloc_get_section (&r_rel); + target_relax_info = get_xtensa_relax_info (target_sec); + + if (target_relax_info + && target_relax_info->is_relaxable_literal_section) + { + /* Translate the relocation's destination. */ + bfd_vma new_offset; + bfd_vma new_end_offset; + bfd_byte *size_p; + long old_size, new_size; + + new_offset = + offset_with_removed_literals (&target_relax_info->removed_list, + r_rel.target_offset); + + /* Assert that we are not out of bounds. */ + size_p = &contents[irel->r_offset + 4]; + old_size = bfd_get_32 (abfd, &contents[irel->r_offset + 4]); + + new_end_offset = + offset_with_removed_literals (&target_relax_info->removed_list, + r_rel.target_offset + old_size); + + new_size = new_end_offset - new_offset; + if (new_size != old_size) + { + bfd_put_32 (abfd, new_size, size_p); + pin_contents (sec, contents); + } + + if (new_offset != r_rel.target_offset) + { + bfd_vma diff = new_offset - r_rel.target_offset; + irel->r_addend += diff; + pin_internal_relocs (sec, internal_relocs); + } + } + } + } + + /* Combine adjacent property table entries. This is also done in + finish_dynamic_sections() but at that point it's too late to + reclaim the space in the output section, so we do this twice. */ + + if (internal_relocs) + { + Elf_Internal_Rela *last_irel = NULL; + int removed_bytes = 0; + bfd_vma offset, last_irel_offset; + bfd_vma section_size; + + /* Walk over memory and irels at the same time. + This REQUIRES that the internal_relocs be sorted by offset. */ + qsort (internal_relocs, sec->reloc_count, sizeof (Elf_Internal_Rela), + internal_reloc_compare); + nexti = 0; /* Index into internal_relocs. */ + + pin_internal_relocs (sec, internal_relocs); + pin_contents (sec, contents); + + last_irel_offset = (bfd_vma) -1; + section_size = (sec->_cooked_size ? sec->_cooked_size : sec->_raw_size); + BFD_ASSERT (section_size % 8 == 0); + + for (offset = 0; offset < section_size; offset += 8) + { + Elf_Internal_Rela *irel, *next_irel; + bfd_vma bytes_to_remove, size, actual_offset; + bfd_boolean remove_this_irel; + + irel = NULL; + next_irel = NULL; + + /* Find the next two relocations (if there are that many left), + skipping over any R_XTENSA_NONE relocs. On entry, "nexti" is + the starting reloc index. After these two loops, "i" + is the index of the first non-NONE reloc past that starting + index, and "nexti" is the index for the next non-NONE reloc + after "i". */ + + for (i = nexti; i < sec->reloc_count; i++) + { + if (ELF32_R_TYPE (internal_relocs[i].r_info) != R_XTENSA_NONE) + { + irel = &internal_relocs[i]; + break; + } + internal_relocs[i].r_offset -= removed_bytes; + } + + for (nexti = i + 1; nexti < sec->reloc_count; nexti++) + { + if (ELF32_R_TYPE (internal_relocs[nexti].r_info) + != R_XTENSA_NONE) + { + next_irel = &internal_relocs[nexti]; + break; + } + internal_relocs[nexti].r_offset -= removed_bytes; + } + + remove_this_irel = FALSE; + bytes_to_remove = 0; + actual_offset = offset - removed_bytes; + size = bfd_get_32 (abfd, &contents[actual_offset + 4]); + + /* Check that the irels are sorted by offset, + with only one per address. */ + BFD_ASSERT (!irel || (int) irel->r_offset > (int) last_irel_offset); + BFD_ASSERT (!next_irel || next_irel->r_offset > irel->r_offset); + + /* Make sure there isn't a reloc on the size field. */ + if (irel && irel->r_offset == offset + 4) + { + irel->r_offset -= removed_bytes; + last_irel_offset = irel->r_offset; + } + else if (next_irel && next_irel->r_offset == offset + 4) + { + nexti += 1; + irel->r_offset -= removed_bytes; + next_irel->r_offset -= removed_bytes; + last_irel_offset = next_irel->r_offset; + } + else if (size == 0) + { + /* Always remove entries with zero size. */ + bytes_to_remove = 8; + if (irel && irel->r_offset == offset) + { + remove_this_irel = TRUE; + + irel->r_offset -= removed_bytes; + last_irel_offset = irel->r_offset; + } + } + else if (irel && irel->r_offset == offset) + { + if (ELF32_R_TYPE (irel->r_info) == R_XTENSA_32) + { + if (last_irel) + { + bfd_vma old_size = + bfd_get_32 (abfd, &contents[last_irel->r_offset + 4]); + bfd_vma old_address = + (last_irel->r_addend + + bfd_get_32 (abfd, &contents[last_irel->r_offset])); + bfd_vma new_address = + (irel->r_addend + + bfd_get_32 (abfd, &contents[actual_offset])); + + if ((ELF32_R_SYM (irel->r_info) == + ELF32_R_SYM (last_irel->r_info)) + && (old_address + old_size == new_address)) + { + /* fix the old size */ + bfd_put_32 (abfd, old_size + size, + &contents[last_irel->r_offset + 4]); + bytes_to_remove = 8; + remove_this_irel = TRUE; + } + else + last_irel = irel; + } + else + last_irel = irel; + } + + irel->r_offset -= removed_bytes; + last_irel_offset = irel->r_offset; + } + + if (remove_this_irel) + { + irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE); + irel->r_offset -= bytes_to_remove; + } + + if (bytes_to_remove != 0) + { + removed_bytes += bytes_to_remove; + if (offset + 8 < section_size) + memmove (&contents[actual_offset], + &contents[actual_offset+8], + section_size - offset - 8); + } + } + + if (removed_bytes) + { + /* Clear the removed bytes. */ + memset (&contents[section_size - removed_bytes], 0, removed_bytes); + + sec->_cooked_size = section_size - removed_bytes; + /* Also shrink _raw_size. (The code in relocate_section that + checks that relocations are within the section must use + _raw_size because of the way the stabs sections are + relaxed; shrinking _raw_size means that these checks will + not be unnecessarily lax.) */ + sec->_raw_size = sec->_cooked_size; + } + } + + error_return: + release_internal_relocs (sec, internal_relocs); + release_contents (sec, contents); + return ok; +} + + +/* Third relaxation pass. */ + +/* Change symbol values to account for removed literals. */ + +bfd_boolean +relax_section_symbols (abfd, sec) + bfd *abfd; + asection *sec; +{ + xtensa_relax_info *relax_info; + unsigned int sec_shndx; + Elf_Internal_Shdr *symtab_hdr; + Elf_Internal_Sym *isymbuf; + unsigned i, num_syms, num_locals; + + relax_info = get_xtensa_relax_info (sec); + BFD_ASSERT (relax_info); + + if (!relax_info->is_relaxable_literal_section) + return TRUE; + + sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec); + + symtab_hdr = &elf_tdata (abfd)->symtab_hdr; + isymbuf = retrieve_local_syms (abfd); + + num_syms = symtab_hdr->sh_size / sizeof (Elf32_External_Sym); + num_locals = symtab_hdr->sh_info; + + /* Adjust the local symbols defined in this section. */ + for (i = 0; i < num_locals; i++) + { + Elf_Internal_Sym *isym = &isymbuf[i]; + + if (isym->st_shndx == sec_shndx) + { + bfd_vma new_address = offset_with_removed_literals + (&relax_info->removed_list, isym->st_value); + if (new_address != isym->st_value) + isym->st_value = new_address; + } + } + + /* Now adjust the global symbols defined in this section. */ + for (i = 0; i < (num_syms - num_locals); i++) + { + struct elf_link_hash_entry *sym_hash; + + sym_hash = elf_sym_hashes (abfd)[i]; + + if (sym_hash->root.type == bfd_link_hash_warning) + sym_hash = (struct elf_link_hash_entry *) sym_hash->root.u.i.link; + + if ((sym_hash->root.type == bfd_link_hash_defined + || sym_hash->root.type == bfd_link_hash_defweak) + && sym_hash->root.u.def.section == sec) + { + bfd_vma new_address = offset_with_removed_literals + (&relax_info->removed_list, sym_hash->root.u.def.value); + if (new_address != sym_hash->root.u.def.value) + sym_hash->root.u.def.value = new_address; + } + } + + return TRUE; +} + + +/* "Fix" handling functions, called while performing relocations. */ + +static void +do_fix_for_relocateable_link (rel, input_bfd, input_section) + Elf_Internal_Rela *rel; + bfd *input_bfd; + asection *input_section; +{ + r_reloc r_rel; + asection *sec, *old_sec; + bfd_vma old_offset; + int r_type = ELF32_R_TYPE (rel->r_info); + reloc_bfd_fix *fix_list; + reloc_bfd_fix *fix; + + if (r_type == R_XTENSA_NONE) + return; + + fix_list = (get_xtensa_relax_info (input_section))->fix_list; + if (fix_list == NULL) + return; + + fix = get_bfd_fix (fix_list, input_section, rel->r_offset, r_type); + if (fix == NULL) + return; + + r_reloc_init (&r_rel, input_bfd, rel); + old_sec = r_reloc_get_section (&r_rel); + old_offset = r_reloc_get_target_offset (&r_rel); + + if (old_sec == NULL || !r_reloc_is_defined (&r_rel)) + { + BFD_ASSERT (r_type == R_XTENSA_ASM_EXPAND); + /* Leave it be. Resolution will happen in a later stage. */ + } + else + { + sec = fix->target_sec; + rel->r_addend += ((sec->output_offset + fix->target_offset) + - (old_sec->output_offset + old_offset)); + } +} + + +static void +do_fix_for_final_link (rel, input_section, relocationp) + Elf_Internal_Rela *rel; + asection *input_section; + bfd_vma *relocationp; +{ + asection *sec; + int r_type = ELF32_R_TYPE (rel->r_info); + reloc_bfd_fix *fix_list; + reloc_bfd_fix *fix; + + if (r_type == R_XTENSA_NONE) + return; + + fix_list = (get_xtensa_relax_info (input_section))->fix_list; + if (fix_list == NULL) + return; + + fix = get_bfd_fix (fix_list, input_section, rel->r_offset, r_type); + if (fix == NULL) + return; + + sec = fix->target_sec; + *relocationp = (sec->output_section->vma + + sec->output_offset + + fix->target_offset - rel->r_addend); +} + + +/* Miscellaneous utility functions.... */ + +static asection * +elf_xtensa_get_plt_section (dynobj, chunk) + bfd *dynobj; + int chunk; +{ + char plt_name[10]; + + if (chunk == 0) + return bfd_get_section_by_name (dynobj, ".plt"); + + sprintf (plt_name, ".plt.%u", chunk); + return bfd_get_section_by_name (dynobj, plt_name); +} + + +static asection * +elf_xtensa_get_gotplt_section (dynobj, chunk) + bfd *dynobj; + int chunk; +{ + char got_name[14]; + + if (chunk == 0) + return bfd_get_section_by_name (dynobj, ".got.plt"); + + sprintf (got_name, ".got.plt.%u", chunk); + return bfd_get_section_by_name (dynobj, got_name); +} + + +/* Get the input section for a given symbol index. + If the symbol is: + . a section symbol, return the section; + . a common symbol, return the common section; + . an undefined symbol, return the undefined section; + . an indirect symbol, follow the links; + . an absolute value, return the absolute section. */ + +static asection * +get_elf_r_symndx_section (abfd, r_symndx) + bfd *abfd; + unsigned long r_symndx; +{ + Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr; + asection *target_sec = NULL; + if (r_symndx < symtab_hdr->sh_info) + { + Elf_Internal_Sym *isymbuf; + unsigned int section_index; + + isymbuf = retrieve_local_syms (abfd); + section_index = isymbuf[r_symndx].st_shndx; + + if (section_index == SHN_UNDEF) + target_sec = bfd_und_section_ptr; + else if (section_index > 0 && section_index < SHN_LORESERVE) + target_sec = bfd_section_from_elf_index (abfd, section_index); + else if (section_index == SHN_ABS) + target_sec = bfd_abs_section_ptr; + else if (section_index == SHN_COMMON) + target_sec = bfd_com_section_ptr; + else + /* Who knows? */ + target_sec = NULL; + } + else + { + unsigned long indx = r_symndx - symtab_hdr->sh_info; + struct elf_link_hash_entry *h = elf_sym_hashes (abfd)[indx]; + + while (h->root.type == bfd_link_hash_indirect + || h->root.type == bfd_link_hash_warning) + h = (struct elf_link_hash_entry *) h->root.u.i.link; + + switch (h->root.type) + { + case bfd_link_hash_defined: + case bfd_link_hash_defweak: + target_sec = h->root.u.def.section; + break; + case bfd_link_hash_common: + target_sec = bfd_com_section_ptr; + break; + case bfd_link_hash_undefined: + case bfd_link_hash_undefweak: + target_sec = bfd_und_section_ptr; + break; + default: /* New indirect warning. */ + target_sec = bfd_und_section_ptr; + break; + } + } + return target_sec; +} + + +static struct elf_link_hash_entry * +get_elf_r_symndx_hash_entry (abfd, r_symndx) + bfd *abfd; + unsigned long r_symndx; +{ + unsigned long indx; + struct elf_link_hash_entry *h; + Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr; + + if (r_symndx < symtab_hdr->sh_info) + return NULL; + + indx = r_symndx - symtab_hdr->sh_info; + h = elf_sym_hashes (abfd)[indx]; + while (h->root.type == bfd_link_hash_indirect + || h->root.type == bfd_link_hash_warning) + h = (struct elf_link_hash_entry *) h->root.u.i.link; + return h; +} + + +/* Get the section-relative offset for a symbol number. */ + +static bfd_vma +get_elf_r_symndx_offset (abfd, r_symndx) + bfd *abfd; + unsigned long r_symndx; +{ + Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr; + bfd_vma offset = 0; + + if (r_symndx < symtab_hdr->sh_info) + { + Elf_Internal_Sym *isymbuf; + isymbuf = retrieve_local_syms (abfd); + offset = isymbuf[r_symndx].st_value; + } + else + { + unsigned long indx = r_symndx - symtab_hdr->sh_info; + struct elf_link_hash_entry *h = + elf_sym_hashes (abfd)[indx]; + + while (h->root.type == bfd_link_hash_indirect + || h->root.type == bfd_link_hash_warning) + h = (struct elf_link_hash_entry *) h->root.u.i.link; + if (h->root.type == bfd_link_hash_defined + || h->root.type == bfd_link_hash_defweak) + offset = h->root.u.def.value; + } + return offset; +} + + +static bfd_boolean +pcrel_reloc_fits (opnd, self_address, dest_address) + xtensa_operand opnd; + bfd_vma self_address; + bfd_vma dest_address; +{ + uint32 new_address = + xtensa_operand_do_reloc (opnd, dest_address, self_address); + return (xtensa_operand_encode (opnd, &new_address) + == xtensa_encode_result_ok); +} + + +static bfd_boolean +xtensa_is_property_section (sec) + asection *sec; +{ + static int len = sizeof (".gnu.linkonce.t.") - 1; + + return (strcmp (".xt.insn", sec->name) == 0 + || strcmp (".xt.lit", sec->name) == 0 + || strncmp (".gnu.linkonce.x.", sec->name, len) == 0 + || strncmp (".gnu.linkonce.p.", sec->name, len) == 0); +} + + +static bfd_boolean +is_literal_section (sec) + asection *sec; +{ + /* FIXME: the current definition of this leaves a lot to be desired.... */ + if (sec == NULL || sec->name == NULL) + return FALSE; + return (strstr (sec->name, "literal") != NULL); +} + + +static int +internal_reloc_compare (ap, bp) + const PTR ap; + const PTR bp; +{ + const Elf_Internal_Rela *a = (const Elf_Internal_Rela *) ap; + const Elf_Internal_Rela *b = (const Elf_Internal_Rela *) bp; + + return (a->r_offset - b->r_offset); +} + + +static bfd_boolean +get_is_linkonce_section (abfd, sec) + bfd *abfd ATTRIBUTE_UNUSED; + asection *sec; +{ + flagword flags, link_once_flags; + bfd_boolean is_linkonce = FALSE;; + + flags = bfd_get_section_flags (abfd, sec); + link_once_flags = (flags & SEC_LINK_ONCE); + if (link_once_flags != 0) + is_linkonce = TRUE; + + /* In order for this to be useful to the assembler + before the linkonce flag is set we need to + check for the GNU extension name. */ + if (!is_linkonce && + strncmp (sec->name, ".gnu.linkonce", sizeof ".gnu.linkonce" - 1) == 0) + is_linkonce = TRUE; + + return is_linkonce; +} + + +char * +xtensa_get_property_section_name (abfd, sec, base_name) + bfd *abfd; + asection *sec; + const char * base_name; +{ + char *table_sec_name = NULL; + bfd_boolean is_linkonce; + + is_linkonce = get_is_linkonce_section (abfd, sec); + + if (!is_linkonce) + { + table_sec_name = strdup (base_name); + } + else + { + static size_t prefix_len = sizeof (".gnu.linkonce.t.") - 1; + size_t len = strlen (sec->name) + 1; + char repl_char = '\0'; + const char *segname = sec->name; + + if (strncmp (segname, ".gnu.linkonce.t.", prefix_len) == 0) + { + if (strcmp (base_name, ".xt.insn") == 0) + repl_char = 'x'; + else if (strcmp (base_name, ".xt.lit") == 0) + repl_char = 'p'; + } + + if (repl_char != '\0') + { + char *name = (char *) bfd_malloc (len); + memcpy (name, sec->name, len); + name[prefix_len - 2] = repl_char; + table_sec_name = name; + } + else + { + size_t base_len = strlen (base_name) + 1; + char *name = (char *) bfd_malloc (len + base_len); + memcpy (name, sec->name, len - 1); + memcpy (name + len - 1, base_name, base_len); + table_sec_name = name; + } + } + + return table_sec_name; +} + + +/* Other functions called directly by the linker. */ + +bfd_boolean +xtensa_callback_required_dependence (abfd, sec, link_info, callback, closure) + bfd *abfd; + asection *sec; + struct bfd_link_info *link_info; + deps_callback_t callback; + PTR closure; +{ + Elf_Internal_Rela *internal_relocs; + bfd_byte *contents; + unsigned i; + bfd_boolean ok = TRUE; + + /* ".plt*" sections have no explicit relocations but they contain L32R + instructions that reference the corresponding ".got.plt*" sections. */ + if ((sec->flags & SEC_LINKER_CREATED) != 0 + && strncmp (sec->name, ".plt", 4) == 0) + { + asection *sgotplt; + + /* Find the corresponding ".got.plt*" section. */ + if (sec->name[4] == '\0') + sgotplt = bfd_get_section_by_name (sec->owner, ".got.plt"); + else + { + char got_name[14]; + int chunk = 0; + + BFD_ASSERT (sec->name[4] == '.'); + chunk = strtol (&sec->name[5], NULL, 10); + + sprintf (got_name, ".got.plt.%u", chunk); + sgotplt = bfd_get_section_by_name (sec->owner, got_name); + } + BFD_ASSERT (sgotplt); + + /* Assume worst-case offsets: L32R at the very end of the ".plt" + section referencing a literal at the very beginning of + ".got.plt". This is very close to the real dependence, anyway. */ + (*callback) (sec, sec->_raw_size, sgotplt, 0, closure); + } + + internal_relocs = retrieve_internal_relocs (abfd, sec, + link_info->keep_memory); + if (internal_relocs == NULL + || sec->reloc_count == 0) + return ok; + + /* Cache the contents for the duration of this scan. */ + contents = retrieve_contents (abfd, sec, link_info->keep_memory); + if (contents == NULL && sec->_raw_size != 0) + { + ok = FALSE; + goto error_return; + } + + if (xtensa_default_isa == NULL) + xtensa_isa_init (); + + for (i = 0; i < sec->reloc_count; i++) + { + Elf_Internal_Rela *irel = &internal_relocs[i]; + if (is_l32r_relocation (sec, contents, irel)) + { + r_reloc l32r_rel; + asection *target_sec; + bfd_vma target_offset; + + r_reloc_init (&l32r_rel, abfd, irel); + target_sec = NULL; + target_offset = 0; + /* L32Rs must be local to the input file. */ + if (r_reloc_is_defined (&l32r_rel)) + { + target_sec = r_reloc_get_section (&l32r_rel); + target_offset = r_reloc_get_target_offset (&l32r_rel); + } + (*callback) (sec, irel->r_offset, target_sec, target_offset, + closure); + } + } + + error_return: + release_internal_relocs (sec, internal_relocs); + release_contents (sec, contents); + return ok; +} + + +#ifndef ELF_ARCH +#define TARGET_LITTLE_SYM bfd_elf32_xtensa_le_vec +#define TARGET_LITTLE_NAME "elf32-xtensa-le" +#define TARGET_BIG_SYM bfd_elf32_xtensa_be_vec +#define TARGET_BIG_NAME "elf32-xtensa-be" +#define ELF_ARCH bfd_arch_xtensa + +/* The new EM_XTENSA value will be recognized beginning in the Xtensa T1040 + release. However, we still have to generate files with the EM_XTENSA_OLD + value so that pre-T1040 tools can read the files. As soon as we stop + caring about pre-T1040 tools, the following two values should be + swapped. At the same time, any other code that uses EM_XTENSA_OLD + (e.g., prep_headers() in elf.c) should be changed to use EM_XTENSA. */ +#define ELF_MACHINE_CODE EM_XTENSA_OLD +#define ELF_MACHINE_ALT1 EM_XTENSA + +#if XCHAL_HAVE_MMU +#define ELF_MAXPAGESIZE (1 << XCHAL_MMU_MIN_PTE_PAGE_SIZE) +#else /* !XCHAL_HAVE_MMU */ +#define ELF_MAXPAGESIZE 1 +#endif /* !XCHAL_HAVE_MMU */ +#endif /* ELF_ARCH */ + +#define elf_backend_can_gc_sections 1 +#define elf_backend_can_refcount 1 +#define elf_backend_plt_readonly 1 +#define elf_backend_got_header_size 4 +#define elf_backend_want_dynbss 0 +#define elf_backend_want_got_plt 1 + +#define elf_info_to_howto elf_xtensa_info_to_howto_rela + +#define bfd_elf32_bfd_final_link bfd_elf32_bfd_final_link +#define bfd_elf32_bfd_merge_private_bfd_data elf_xtensa_merge_private_bfd_data +#define bfd_elf32_new_section_hook elf_xtensa_new_section_hook +#define bfd_elf32_bfd_print_private_bfd_data elf_xtensa_print_private_bfd_data +#define bfd_elf32_bfd_relax_section elf_xtensa_relax_section +#define bfd_elf32_bfd_reloc_type_lookup elf_xtensa_reloc_type_lookup +#define bfd_elf32_bfd_set_private_flags elf_xtensa_set_private_flags + +#define elf_backend_adjust_dynamic_symbol elf_xtensa_adjust_dynamic_symbol +#define elf_backend_check_relocs elf_xtensa_check_relocs +#define elf_backend_copy_indirect_symbol elf_xtensa_copy_indirect_symbol +#define elf_backend_create_dynamic_sections elf_xtensa_create_dynamic_sections +#define elf_backend_discard_info elf_xtensa_discard_info +#define elf_backend_ignore_discarded_relocs elf_xtensa_ignore_discarded_relocs +#define elf_backend_final_write_processing elf_xtensa_final_write_processing +#define elf_backend_finish_dynamic_sections elf_xtensa_finish_dynamic_sections +#define elf_backend_finish_dynamic_symbol elf_xtensa_finish_dynamic_symbol +#define elf_backend_gc_mark_hook elf_xtensa_gc_mark_hook +#define elf_backend_gc_sweep_hook elf_xtensa_gc_sweep_hook +#define elf_backend_grok_prstatus elf_xtensa_grok_prstatus +#define elf_backend_grok_psinfo elf_xtensa_grok_psinfo +#define elf_backend_hide_symbol elf_xtensa_hide_symbol +#define elf_backend_modify_segment_map elf_xtensa_modify_segment_map +#define elf_backend_object_p elf_xtensa_object_p +#define elf_backend_reloc_type_class elf_xtensa_reloc_type_class +#define elf_backend_relocate_section elf_xtensa_relocate_section +#define elf_backend_size_dynamic_sections elf_xtensa_size_dynamic_sections + +#include "elf32-target.h" |