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| author | Bernd Schmidt <bernds@codesourcery.com> | 2006-03-26 00:38:42 +0000 |
|---|---|---|
| committer | Bernd Schmidt <bernds@codesourcery.com> | 2006-03-26 00:38:42 +0000 |
| commit | 48d502e18e90fd25600d9d7f8191b09218e22603 (patch) | |
| tree | 88a8c3bef8131c7b79cd6ac4ae1e0b2efb423b72 /bfd/elf32-bfin.c | |
| parent | 29fcb30c9c28d6e27f2b4f0db6b0f4d53fa97da6 (diff) | |
| download | gdb-48d502e18e90fd25600d9d7f8191b09218e22603.zip gdb-48d502e18e90fd25600d9d7f8191b09218e22603.tar.gz gdb-48d502e18e90fd25600d9d7f8191b09218e22603.tar.bz2 | |
* config.bfd (bfin-*-*): Add bfd_elf32_bfinfdpic_vec.
* configure.in: Likewise.
* configure: Regenerate.
* elf32-bfin.c: Include "elf/dwarf2.h" and "hashtab.h".
(BFIN_RELOC_MAX): Now 0x21.
(bfin_howto_table, bfin_reloc_map): Add FD-PIC relocs.
(bfd_elf32_bfinfdpic_vec): Declare.
(IS_FDPIC): New macro.
(struct bfinfdpic_elf_link_hash_table): New struct.
(bfinfdpic_hash_table, bfinfdpic_got_section,
bfinfdpic_gotrel_section, bfinfdpic_gotfixup_section,
bfinfdpic_plt_setion, bfinfdpic_pltrel_section,
bfinfdpic_relocs_info, bfinfdpic_got_initial_offset,
bfinfdpic_plt_initial_offset): Accessor macros for it.
(BFINFDPIC_SYM_LOCAL, BFINFDPIC_FUNCDESC_LOCAL): New macros.
(struct bfinfdpic_relocs_info): New struct.
(LZPLT_RESOLVER_EXTRA, LZPLT_NORMAL_SIZE, LZPLT_ENTRIES,
BFINFDPIC_LZPLT_BLOCK_SIZE, BFINFDPIC_LZPLT_RESOLV_LOC,
DEFAULT_STACK_SIZE): New macros.
(bfinfdpic_elf_link_hash_table_create, bfinfdpic_relocs_info_hash,
bfinfdpic_relocs_info_eq, bfinfdpics_relocs_info_find,
bfinfdpic_relocs_info_for_global, bfinfdpic_relocs_info_for_local,
bfinfdpic_pic_merge_early_relocs_info, _bfinfdpic_add_dyn_reloc,
_bfinfdpic_add_rofixup, _bfinfdpic_osec_to_segment,
_bfinfdpic_osec_readonly_p, bfinfdpic_relocate_section,
bfinfdpic_check_relocs, bfinfdpic_gc_sweep_hook,
_bfinfdpic_link_omit_section_dynsym, _bfin_create_got_section,
elf32_bfinfdpic_create_dynamic_sections, _bfinfdpic_get_fd_entry,
_bfinfdpic_compute_got_alloc_data, _bfinfdpic_get_got_entry,
_bfinfdpic_assign_got_entries, _bfinfdpic_assign_plt_entries,
_bfinfdpic_resolve_final_relocs_info,
elf32_bfinfdpic_size_dynamic_sections,
elf32_bfinfdpic_always_size_sections,
elf32_bfinfdpic_modify_segment_map,
_bfinfdpic_count_got_plt_entries,
elf32_bfinfdpic_finish_dynamic_sections,
elf32_bfinfdpic_adjust_dynamic_symbol,
elf32_bfinfdpic_finish_dynamic_symbol,
elf32_bfinfdpic_elf_use_relative_eh_frame,
elf32_bfinfdpic_elf_encode_eh_address,
elf32_bfin_object_p, bfin_elf_copy_private_bfd_data,
elf32_bfinfdpic_copy_private_bfd_data,
(struct _bfinfdpic_dynamic_got_info,
struct _bfinfdpic_dynamic_got_plt_info): New structs.
(elf32_bfin_print_private_bfd_data): Print PIC flags.
(elf32_bfin_merge_private_bfd_data): Extend to support FD-PIC.
(TARGET_LITTLE_SYM, TARGET_LITTLE_NAME, elf32_bed,
elf_backend_got_header_size, bfd_elf32_bfd_link_hash_table_create,
elf_backend_always_size_sectinos, elf_backend_modify_segment_map,
bfd_elf32_bfd_copy_private_bfd_data,
elf_backend_create_dynamic_sections, elf_backend_adjust_dynamic_symbol,
elf_backend_size_dynamic_sections, elf_backend_finish_dynamic_symbol,
elf_backend_finish_dynamic_sections, elf_backend_relocate_section,
elf_backend_can_make_relative_eh_frame, elf_backend_check_relocs,
elf_backend_can_make_ldsa_relative_eh_frame, elf_backend_may_use_rel_p,
elf_backend_may_use_rela_p, elf_backend_default_use_rela_p,
elf_backend_omit_section_dynsym): Redefine these macros and include
"elf32-target.h" again to create the elf32-bfinfdpic target.
* reloc.c (BFD_RELOC_BFIN_GOT17M4, BFD_RELOC_BFIN_GOTHI,
BFD_RELOC_BFIN_GOTLO, BFD_RELOC_BFIN_FUNCDESC,
BFD_RELOC_BFIN_FUNCDESC_GOT17M4, BFD_RELOC_BFIN_FUNCDESC_GOTHI,
BFD_RELOC_BFIN_FUNCDESC_GOTLO, BFD_RELOC_BFIN_FUNCDESC_VALUE,
BFD_RELOC_BFIN_FUNCDESC_GOTOFF17M4, BFD_RELOC_BFIN_FUNCDESC_GOTOFFHI,
BFD_RELOC_BFIN_FUNCDESC_GOTOFFLO, BFD_RELOC_BFIN_GOTOFFHI,
BFD_RELOC_BFIN_GOTOFFLO): New.
* targets.c (bfd_elf32_bfinfdpic_vec): New bfd_target.
(_bfd_target_vector): Add it.
* bfd-in2.h: Regenerate.
* libbfd.h: Regenerate.
Diffstat (limited to 'bfd/elf32-bfin.c')
| -rw-r--r-- | bfd/elf32-bfin.c | 3533 |
1 files changed, 3508 insertions, 25 deletions
diff --git a/bfd/elf32-bfin.c b/bfd/elf32-bfin.c index d973ddf..219a834 100644 --- a/bfd/elf32-bfin.c +++ b/bfd/elf32-bfin.c @@ -23,6 +23,8 @@ #include "libbfd.h" #include "elf-bfd.h" #include "elf/bfin.h" +#include "elf/dwarf2.h" +#include "hashtab.h" /* FUNCTION : bfin_pltpc_reloc ABSTRACT : TODO : figure out how to handle pltpc relocs. */ @@ -410,7 +412,7 @@ bfin_bfd_reloc (bfd *abfd, the relocation stack. . */ #define BFIN_RELOC_MIN 0 -#define BFIN_RELOC_MAX 0x13 +#define BFIN_RELOC_MAX 0x21 #define BFIN_GNUEXT_RELOC_MIN 0x40 #define BFIN_GNUEXT_RELOC_MAX 0x43 #define BFIN_ARELOC_MIN 0xE0 @@ -702,6 +704,229 @@ static reloc_howto_type bfin_howto_table [] = 0, /* src_mask. */ 0x000003FF, /* dst_mask. */ FALSE), /* pcrel_offset. */ + + + /* A 18-bit signed operand with the GOT offset for the address of + the symbol. */ + HOWTO (R_BFIN_GOT17M4, /* type */ + 2, /* rightshift */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 16, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_signed, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_BFIN_GOT12", /* name */ + FALSE, /* partial_inplace */ + 0xffff, /* src_mask */ + 0xffff, /* dst_mask */ + FALSE), /* pcrel_offset */ + + /* The upper 16 bits of the GOT offset for the address of the + symbol. */ + HOWTO (R_BFIN_GOTHI, /* type */ + 0, /* rightshift */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 16, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_dont, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_BFIN_GOTHI", /* name */ + FALSE, /* partial_inplace */ + 0xffff, /* src_mask */ + 0xffff, /* dst_mask */ + FALSE), /* pcrel_offset */ + + /* The lower 16 bits of the GOT offset for the address of the + symbol. */ + HOWTO (R_BFIN_GOTLO, /* type */ + 0, /* rightshift */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 16, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_dont, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_BFIN_GOTLO", /* name */ + FALSE, /* partial_inplace */ + 0xffff, /* src_mask */ + 0xffff, /* dst_mask */ + FALSE), /* pcrel_offset */ + + /* The 32-bit address of the canonical descriptor of a function. */ + HOWTO (R_BFIN_FUNCDESC, /* type */ + 0, /* rightshift */ + 2, /* size (0 = byte, 1 = short, 2 = long) */ + 32, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_BFIN_FUNCDESC", /* name */ + FALSE, /* partial_inplace */ + 0xffffffff, /* src_mask */ + 0xffffffff, /* dst_mask */ + FALSE), /* pcrel_offset */ + + /* A 12-bit signed operand with the GOT offset for the address of + canonical descriptor of a function. */ + HOWTO (R_BFIN_FUNCDESC_GOT17M4, /* type */ + 2, /* rightshift */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 16, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_signed, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_BFIN_FUNCDESC_GOT17M4", /* name */ + FALSE, /* partial_inplace */ + 0xffff, /* src_mask */ + 0xffff, /* dst_mask */ + FALSE), /* pcrel_offset */ + + /* The upper 16 bits of the GOT offset for the address of the + canonical descriptor of a function. */ + HOWTO (R_BFIN_FUNCDESC_GOTHI, /* type */ + 0, /* rightshift */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 16, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_dont, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_BFIN_FUNCDESC_GOTHI", /* name */ + FALSE, /* partial_inplace */ + 0xffff, /* src_mask */ + 0xffff, /* dst_mask */ + FALSE), /* pcrel_offset */ + + /* The lower 16 bits of the GOT offset for the address of the + canonical descriptor of a function. */ + HOWTO (R_BFIN_FUNCDESC_GOTLO, /* type */ + 0, /* rightshift */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 16, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_dont, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_BFIN_FUNCDESC_GOTLO", /* name */ + FALSE, /* partial_inplace */ + 0xffff, /* src_mask */ + 0xffff, /* dst_mask */ + FALSE), /* pcrel_offset */ + + /* The 32-bit address of the canonical descriptor of a function. */ + HOWTO (R_BFIN_FUNCDESC_VALUE, /* type */ + 0, /* rightshift */ + 2, /* size (0 = byte, 1 = short, 2 = long) */ + 64, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_BFIN_FUNCDESC_VALUE", /* name */ + FALSE, /* partial_inplace */ + 0xffffffff, /* src_mask */ + 0xffffffff, /* dst_mask */ + FALSE), /* pcrel_offset */ + + /* A 12-bit signed operand with the GOT offset for the address of + canonical descriptor of a function. */ + HOWTO (R_BFIN_FUNCDESC_GOTOFF17M4, /* type */ + 2, /* rightshift */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 16, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_signed, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_BFIN_FUNCDESC_GOTOFF17M4", /* name */ + FALSE, /* partial_inplace */ + 0xffff, /* src_mask */ + 0xffff, /* dst_mask */ + FALSE), /* pcrel_offset */ + + /* The upper 16 bits of the GOT offset for the address of the + canonical descriptor of a function. */ + HOWTO (R_BFIN_FUNCDESC_GOTOFFHI, /* type */ + 0, /* rightshift */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 16, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_dont, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_BFIN_FUNCDESC_GOTOFFHI", /* name */ + FALSE, /* partial_inplace */ + 0xffff, /* src_mask */ + 0xffff, /* dst_mask */ + FALSE), /* pcrel_offset */ + + /* The lower 16 bits of the GOT offset for the address of the + canonical descriptor of a function. */ + HOWTO (R_BFIN_FUNCDESC_GOTOFFLO, /* type */ + 0, /* rightshift */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 16, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_dont, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_BFIN_FUNCDESC_GOTOFFLO", /* name */ + FALSE, /* partial_inplace */ + 0xffff, /* src_mask */ + 0xffff, /* dst_mask */ + FALSE), /* pcrel_offset */ + + /* A 12-bit signed operand with the GOT offset for the address of + the symbol. */ + HOWTO (R_BFIN_GOTOFF17M4, /* type */ + 2, /* rightshift */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 16, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_signed, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_BFIN_GOTOFF17M4", /* name */ + FALSE, /* partial_inplace */ + 0xffff, /* src_mask */ + 0xffff, /* dst_mask */ + FALSE), /* pcrel_offset */ + + /* The upper 16 bits of the GOT offset for the address of the + symbol. */ + HOWTO (R_BFIN_GOTOFFHI, /* type */ + 0, /* rightshift */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 16, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_dont, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_BFIN_GOTOFFHI", /* name */ + FALSE, /* partial_inplace */ + 0xffff, /* src_mask */ + 0xffff, /* dst_mask */ + FALSE), /* pcrel_offset */ + + /* The lower 16 bits of the GOT offset for the address of the + symbol. */ + HOWTO (R_BFIN_GOTOFFLO, /* type */ + 0, /* rightshift */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 16, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_dont, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_BFIN_GOTOFFLO", /* name */ + FALSE, /* partial_inplace */ + 0xffff, /* src_mask */ + 0xffff, /* dst_mask */ + FALSE), /* pcrel_offset */ }; static reloc_howto_type bfin_gnuext_howto_table [] = @@ -794,6 +1019,22 @@ static const struct bfin_reloc_map bfin_reloc_map [] = { BFD_RELOC_BFIN_11_PCREL, R_pcrel11 }, { BFD_RELOC_BFIN_GOT, R_got }, { BFD_RELOC_BFIN_PLTPC, R_pltpc }, + + { BFD_RELOC_BFIN_GOT17M4, R_BFIN_GOT17M4 }, + { BFD_RELOC_BFIN_GOTHI, R_BFIN_GOTHI }, + { BFD_RELOC_BFIN_GOTLO, R_BFIN_GOTLO }, + { BFD_RELOC_BFIN_FUNCDESC, R_BFIN_FUNCDESC }, + { BFD_RELOC_BFIN_FUNCDESC_GOT17M4, R_BFIN_FUNCDESC_GOT17M4 }, + { BFD_RELOC_BFIN_FUNCDESC_GOTHI, R_BFIN_FUNCDESC_GOTHI }, + { BFD_RELOC_BFIN_FUNCDESC_GOTLO, R_BFIN_FUNCDESC_GOTLO }, + { BFD_RELOC_BFIN_FUNCDESC_VALUE, R_BFIN_FUNCDESC_VALUE }, + { BFD_RELOC_BFIN_FUNCDESC_GOTOFF17M4, R_BFIN_FUNCDESC_GOTOFF17M4 }, + { BFD_RELOC_BFIN_FUNCDESC_GOTOFFHI, R_BFIN_FUNCDESC_GOTOFFHI }, + { BFD_RELOC_BFIN_FUNCDESC_GOTOFFLO, R_BFIN_FUNCDESC_GOTOFFLO }, + { BFD_RELOC_BFIN_GOTOFF17M4, R_BFIN_GOTOFF17M4 }, + { BFD_RELOC_BFIN_GOTOFFHI, R_BFIN_GOTOFFHI }, + { BFD_RELOC_BFIN_GOTOFFLO, R_BFIN_GOTOFFLO }, + { BFD_RELOC_VTABLE_INHERIT, R_BFIN_GNU_VTINHERIT }, { BFD_RELOC_VTABLE_ENTRY, R_BFIN_GNU_VTENTRY }, }; @@ -867,6 +1108,797 @@ bfin_is_local_label_name ( return _bfd_elf_is_local_label_name (abfd, label); } +extern const bfd_target bfd_elf32_bfinfdpic_vec; +#define IS_FDPIC(bfd) ((bfd)->xvec == &bfd_elf32_bfinfdpic_vec) + +/* An extension of the elf hash table data structure, containing some + additional Blackfin-specific data. */ +struct bfinfdpic_elf_link_hash_table +{ + struct elf_link_hash_table elf; + + /* A pointer to the .got section. */ + asection *sgot; + /* A pointer to the .rel.got section. */ + asection *sgotrel; + /* A pointer to the .rofixup section. */ + asection *sgotfixup; + /* A pointer to the .plt section. */ + asection *splt; + /* A pointer to the .rel.plt section. */ + asection *spltrel; + /* GOT base offset. */ + bfd_vma got0; + /* Location of the first non-lazy PLT entry, i.e., the number of + bytes taken by lazy PLT entries. */ + bfd_vma plt0; + /* A hash table holding information about which symbols were + referenced with which PIC-related relocations. */ + struct htab *relocs_info; +}; + +/* Get the Blackfin ELF linker hash table from a link_info structure. */ + +#define bfinfdpic_hash_table(info) \ + ((struct bfinfdpic_elf_link_hash_table *) ((info)->hash)) + +#define bfinfdpic_got_section(info) \ + (bfinfdpic_hash_table (info)->sgot) +#define bfinfdpic_gotrel_section(info) \ + (bfinfdpic_hash_table (info)->sgotrel) +#define bfinfdpic_gotfixup_section(info) \ + (bfinfdpic_hash_table (info)->sgotfixup) +#define bfinfdpic_plt_section(info) \ + (bfinfdpic_hash_table (info)->splt) +#define bfinfdpic_pltrel_section(info) \ + (bfinfdpic_hash_table (info)->spltrel) +#define bfinfdpic_relocs_info(info) \ + (bfinfdpic_hash_table (info)->relocs_info) +#define bfinfdpic_got_initial_offset(info) \ + (bfinfdpic_hash_table (info)->got0) +#define bfinfdpic_plt_initial_offset(info) \ + (bfinfdpic_hash_table (info)->plt0) + +/* Create a Blackfin ELF linker hash table. */ + +static struct bfd_link_hash_table * +bfinfdpic_elf_link_hash_table_create (bfd *abfd) +{ + struct bfinfdpic_elf_link_hash_table *ret; + bfd_size_type amt = sizeof (struct bfinfdpic_elf_link_hash_table); + + ret = bfd_zalloc (abfd, amt); + if (ret == NULL) + return NULL; + + if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, + _bfd_elf_link_hash_newfunc, + sizeof (struct elf_link_hash_entry))) + { + free (ret); + return NULL; + } + + return &ret->elf.root; +} + +/* Decide whether a reference to a symbol can be resolved locally or + not. If the symbol is protected, we want the local address, but + its function descriptor must be assigned by the dynamic linker. */ +#define BFINFDPIC_SYM_LOCAL(INFO, H) \ + (_bfd_elf_symbol_refs_local_p ((H), (INFO), 1) \ + || ! elf_hash_table (INFO)->dynamic_sections_created) +#define BFINFDPIC_FUNCDESC_LOCAL(INFO, H) \ + ((H)->dynindx == -1 || ! elf_hash_table (INFO)->dynamic_sections_created) + +/* This structure collects information on what kind of GOT, PLT or + function descriptors are required by relocations that reference a + certain symbol. */ +struct bfinfdpic_relocs_info +{ + /* The index of the symbol, as stored in the relocation r_info, if + we have a local symbol; -1 otherwise. */ + long symndx; + union + { + /* The input bfd in which the symbol is defined, if it's a local + symbol. */ + bfd *abfd; + /* If symndx == -1, the hash table entry corresponding to a global + symbol (even if it turns out to bind locally, in which case it + should ideally be replaced with section's symndx + addend). */ + struct elf_link_hash_entry *h; + } d; + /* The addend of the relocation that references the symbol. */ + bfd_vma addend; + + /* The fields above are used to identify an entry. The fields below + contain information on how an entry is used and, later on, which + locations it was assigned. */ + /* The following 2 fields record whether the symbol+addend above was + ever referenced with a GOT relocation. The 17M4 suffix indicates a + GOT17M4 relocation; hilo is used for GOTLO/GOTHI pairs. */ + unsigned got17m4:1; + unsigned gothilo:1; + /* Whether a FUNCDESC relocation references symbol+addend. */ + unsigned fd:1; + /* Whether a FUNCDESC_GOT relocation references symbol+addend. */ + unsigned fdgot17m4:1; + unsigned fdgothilo:1; + /* Whether a FUNCDESC_GOTOFF relocation references symbol+addend. */ + unsigned fdgoff17m4:1; + unsigned fdgoffhilo:1; + /* Whether symbol+addend is referenced with GOTOFF17M4, GOTOFFLO or + GOTOFFHI relocations. The addend doesn't really matter, since we + envision that this will only be used to check whether the symbol + is mapped to the same segment as the got. */ + unsigned gotoff:1; + /* Whether symbol+addend is referenced by a LABEL24 relocation. */ + unsigned call:1; + /* Whether symbol+addend is referenced by a 32 or FUNCDESC_VALUE + relocation. */ + unsigned sym:1; + /* Whether we need a PLT entry for a symbol. Should be implied by + something like: + (call && symndx == -1 && ! BFINFDPIC_SYM_LOCAL (info, d.h)) */ + unsigned plt:1; + /* Whether a function descriptor should be created in this link unit + for symbol+addend. Should be implied by something like: + (plt || fdgotoff17m4 || fdgotofflohi + || ((fd || fdgot17m4 || fdgothilo) + && (symndx != -1 || BFINFDPIC_FUNCDESC_LOCAL (info, d.h)))) */ + unsigned privfd:1; + /* Whether a lazy PLT entry is needed for this symbol+addend. + Should be implied by something like: + (privfd && symndx == -1 && ! BFINFDPIC_SYM_LOCAL (info, d.h) + && ! (info->flags & DF_BIND_NOW)) */ + unsigned lazyplt:1; + /* Whether we've already emitted GOT relocations and PLT entries as + needed for this symbol. */ + unsigned done:1; + + /* The number of R_byte4_data, R_BFIN_FUNCDESC and R_BFIN_FUNCDESC_VALUE + relocations referencing the symbol. */ + unsigned relocs32, relocsfd, relocsfdv; + + /* The number of .rofixups entries and dynamic relocations allocated + for this symbol, minus any that might have already been used. */ + unsigned fixups, dynrelocs; + + /* The offsets of the GOT entries assigned to symbol+addend, to the + function descriptor's address, and to a function descriptor, + respectively. Should be zero if unassigned. The offsets are + counted from the value that will be assigned to the PIC register, + not from the beginning of the .got section. */ + bfd_signed_vma got_entry, fdgot_entry, fd_entry; + /* The offsets of the PLT entries assigned to symbol+addend, + non-lazy and lazy, respectively. If unassigned, should be + (bfd_vma)-1. */ + bfd_vma plt_entry, lzplt_entry; +}; + +/* Compute a hash with the key fields of an bfinfdpic_relocs_info entry. */ +static hashval_t +bfinfdpic_relocs_info_hash (const void *entry_) +{ + const struct bfinfdpic_relocs_info *entry = entry_; + + return (entry->symndx == -1 + ? entry->d.h->root.root.hash + : entry->symndx + entry->d.abfd->id * 257) + entry->addend; +} + +/* Test whether the key fields of two bfinfdpic_relocs_info entries are + identical. */ +static int +bfinfdpic_relocs_info_eq (const void *entry1, const void *entry2) +{ + const struct bfinfdpic_relocs_info *e1 = entry1; + const struct bfinfdpic_relocs_info *e2 = entry2; + + return e1->symndx == e2->symndx && e1->addend == e2->addend + && (e1->symndx == -1 ? e1->d.h == e2->d.h : e1->d.abfd == e2->d.abfd); +} + +/* Find or create an entry in a hash table HT that matches the key + fields of the given ENTRY. If it's not found, memory for a new + entry is allocated in ABFD's obstack. */ +static struct bfinfdpic_relocs_info * +bfinfdpic_relocs_info_find (struct htab *ht, + bfd *abfd, + const struct bfinfdpic_relocs_info *entry, + enum insert_option insert) +{ + struct bfinfdpic_relocs_info **loc = + (struct bfinfdpic_relocs_info **) htab_find_slot (ht, entry, insert); + + if (! loc) + return NULL; + + if (*loc) + return *loc; + + *loc = bfd_zalloc (abfd, sizeof (**loc)); + + if (! *loc) + return *loc; + + (*loc)->symndx = entry->symndx; + (*loc)->d = entry->d; + (*loc)->addend = entry->addend; + (*loc)->plt_entry = (bfd_vma)-1; + (*loc)->lzplt_entry = (bfd_vma)-1; + + return *loc; +} + +/* Obtain the address of the entry in HT associated with H's symbol + + addend, creating a new entry if none existed. ABFD is only used + for memory allocation purposes. */ +inline static struct bfinfdpic_relocs_info * +bfinfdpic_relocs_info_for_global (struct htab *ht, + bfd *abfd, + struct elf_link_hash_entry *h, + bfd_vma addend, + enum insert_option insert) +{ + struct bfinfdpic_relocs_info entry; + + entry.symndx = -1; + entry.d.h = h; + entry.addend = addend; + + return bfinfdpic_relocs_info_find (ht, abfd, &entry, insert); +} + +/* Obtain the address of the entry in HT associated with the SYMNDXth + local symbol of the input bfd ABFD, plus the addend, creating a new + entry if none existed. */ +inline static struct bfinfdpic_relocs_info * +bfinfdpic_relocs_info_for_local (struct htab *ht, + bfd *abfd, + long symndx, + bfd_vma addend, + enum insert_option insert) +{ + struct bfinfdpic_relocs_info entry; + + entry.symndx = symndx; + entry.d.abfd = abfd; + entry.addend = addend; + + return bfinfdpic_relocs_info_find (ht, abfd, &entry, insert); +} + +/* Merge fields set by check_relocs() of two entries that end up being + mapped to the same (presumably global) symbol. */ + +inline static void +bfinfdpic_pic_merge_early_relocs_info (struct bfinfdpic_relocs_info *e2, + struct bfinfdpic_relocs_info const *e1) +{ + e2->got17m4 |= e1->got17m4; + e2->gothilo |= e1->gothilo; + e2->fd |= e1->fd; + e2->fdgot17m4 |= e1->fdgot17m4; + e2->fdgothilo |= e1->fdgothilo; + e2->fdgoff17m4 |= e1->fdgoff17m4; + e2->fdgoffhilo |= e1->fdgoffhilo; + e2->gotoff |= e1->gotoff; + e2->call |= e1->call; + e2->sym |= e1->sym; +} + +/* Every block of 65535 lazy PLT entries shares a single call to the + resolver, inserted in the 32768th lazy PLT entry (i.e., entry # + 32767, counting from 0). All other lazy PLT entries branch to it + in a single instruction. */ + +#define LZPLT_RESOLVER_EXTRA 10 +#define LZPLT_NORMAL_SIZE 6 +#define LZPLT_ENTRIES 1362 + +#define BFINFDPIC_LZPLT_BLOCK_SIZE ((bfd_vma) LZPLT_NORMAL_SIZE * LZPLT_ENTRIES + LZPLT_RESOLVER_EXTRA) +#define BFINFDPIC_LZPLT_RESOLV_LOC (LZPLT_NORMAL_SIZE * LZPLT_ENTRIES / 2) + +/* Add a dynamic relocation to the SRELOC section. */ + +inline static bfd_vma +_bfinfdpic_add_dyn_reloc (bfd *output_bfd, asection *sreloc, bfd_vma offset, + int reloc_type, long dynindx, bfd_vma addend, + struct bfinfdpic_relocs_info *entry) +{ + Elf_Internal_Rela outrel; + bfd_vma reloc_offset; + + outrel.r_offset = offset; + outrel.r_info = ELF32_R_INFO (dynindx, reloc_type); + outrel.r_addend = addend; + + reloc_offset = sreloc->reloc_count * sizeof (Elf32_External_Rel); + BFD_ASSERT (reloc_offset < sreloc->size); + bfd_elf32_swap_reloc_out (output_bfd, &outrel, + sreloc->contents + reloc_offset); + sreloc->reloc_count++; + + /* If the entry's index is zero, this relocation was probably to a + linkonce section that got discarded. We reserved a dynamic + relocation, but it was for another entry than the one we got at + the time of emitting the relocation. Unfortunately there's no + simple way for us to catch this situation, since the relocation + is cleared right before calling relocate_section, at which point + we no longer know what the relocation used to point to. */ + if (entry->symndx) + { + BFD_ASSERT (entry->dynrelocs > 0); + entry->dynrelocs--; + } + + return reloc_offset; +} + +/* Add a fixup to the ROFIXUP section. */ + +static bfd_vma +_bfinfdpic_add_rofixup (bfd *output_bfd, asection *rofixup, bfd_vma offset, + struct bfinfdpic_relocs_info *entry) +{ + bfd_vma fixup_offset; + + if (rofixup->flags & SEC_EXCLUDE) + return -1; + + fixup_offset = rofixup->reloc_count * 4; + if (rofixup->contents) + { + BFD_ASSERT (fixup_offset < rofixup->size); + bfd_put_32 (output_bfd, offset, rofixup->contents + fixup_offset); + } + rofixup->reloc_count++; + + if (entry && entry->symndx) + { + /* See discussion about symndx == 0 in _bfinfdpic_add_dyn_reloc + above. */ + BFD_ASSERT (entry->fixups > 0); + entry->fixups--; + } + + return fixup_offset; +} + +/* Find the segment number in which OSEC, and output section, is + located. */ + +static unsigned +_bfinfdpic_osec_to_segment (bfd *output_bfd, asection *osec) +{ + struct elf_segment_map *m; + Elf_Internal_Phdr *p; + + /* Find the segment that contains the output_section. */ + for (m = elf_tdata (output_bfd)->segment_map, + p = elf_tdata (output_bfd)->phdr; + m != NULL; + m = m->next, p++) + { + int i; + + for (i = m->count - 1; i >= 0; i--) + if (m->sections[i] == osec) + break; + + if (i >= 0) + break; + } + + return p - elf_tdata (output_bfd)->phdr; +} + +inline static bfd_boolean +_bfinfdpic_osec_readonly_p (bfd *output_bfd, asection *osec) +{ + unsigned seg = _bfinfdpic_osec_to_segment (output_bfd, osec); + + return ! (elf_tdata (output_bfd)->phdr[seg].p_flags & PF_W); +} + +/* Generate relocations for GOT entries, function descriptors, and + code for PLT and lazy PLT entries. */ + +inline static bfd_boolean +_bfinfdpic_emit_got_relocs_plt_entries (struct bfinfdpic_relocs_info *entry, + bfd *output_bfd, + struct bfd_link_info *info, + asection *sec, + Elf_Internal_Sym *sym, + bfd_vma addend) + +{ + bfd_vma fd_lazy_rel_offset = (bfd_vma)-1; + int dynindx = -1; + + if (entry->done) + return TRUE; + entry->done = 1; + + if (entry->got_entry || entry->fdgot_entry || entry->fd_entry) + { + /* If the symbol is dynamic, consider it for dynamic + relocations, otherwise decay to section + offset. */ + if (entry->symndx == -1 && entry->d.h->dynindx != -1) + dynindx = entry->d.h->dynindx; + else + { + if (sec->output_section + && ! bfd_is_abs_section (sec->output_section) + && ! bfd_is_und_section (sec->output_section)) + dynindx = elf_section_data (sec->output_section)->dynindx; + else + dynindx = 0; + } + } + + /* Generate relocation for GOT entry pointing to the symbol. */ + if (entry->got_entry) + { + int idx = dynindx; + bfd_vma ad = addend; + + /* If the symbol is dynamic but binds locally, use + section+offset. */ + if (sec && (entry->symndx != -1 + || BFINFDPIC_SYM_LOCAL (info, entry->d.h))) + { + if (entry->symndx == -1) + ad += entry->d.h->root.u.def.value; + else + ad += sym->st_value; + ad += sec->output_offset; + if (sec->output_section && elf_section_data (sec->output_section)) + idx = elf_section_data (sec->output_section)->dynindx; + else + idx = 0; + } + + /* If we're linking an executable at a fixed address, we can + omit the dynamic relocation as long as the symbol is local to + this module. */ + if (info->executable && !info->pie + && (entry->symndx != -1 + || BFINFDPIC_SYM_LOCAL (info, entry->d.h))) + { + if (sec) + ad += sec->output_section->vma; + if (entry->symndx != -1 + || entry->d.h->root.type != bfd_link_hash_undefweak) + _bfinfdpic_add_rofixup (output_bfd, + bfinfdpic_gotfixup_section (info), + bfinfdpic_got_section (info)->output_section + ->vma + + bfinfdpic_got_section (info)->output_offset + + bfinfdpic_got_initial_offset (info) + + entry->got_entry, entry); + } + else + _bfinfdpic_add_dyn_reloc (output_bfd, bfinfdpic_gotrel_section (info), + _bfd_elf_section_offset + (output_bfd, info, + bfinfdpic_got_section (info), + bfinfdpic_got_initial_offset (info) + + entry->got_entry) + + bfinfdpic_got_section (info) + ->output_section->vma + + bfinfdpic_got_section (info)->output_offset, + R_byte4_data, idx, ad, entry); + + bfd_put_32 (output_bfd, ad, + bfinfdpic_got_section (info)->contents + + bfinfdpic_got_initial_offset (info) + + entry->got_entry); + } + + /* Generate relocation for GOT entry pointing to a canonical + function descriptor. */ + if (entry->fdgot_entry) + { + int reloc, idx; + bfd_vma ad = 0; + + if (! (entry->symndx == -1 + && entry->d.h->root.type == bfd_link_hash_undefweak + && BFINFDPIC_SYM_LOCAL (info, entry->d.h))) + { + /* If the symbol is dynamic and there may be dynamic symbol + resolution because we are, or are linked with, a shared + library, emit a FUNCDESC relocation such that the dynamic + linker will allocate the function descriptor. If the + symbol needs a non-local function descriptor but binds + locally (e.g., its visibility is protected, emit a + dynamic relocation decayed to section+offset. */ + if (entry->symndx == -1 + && ! BFINFDPIC_FUNCDESC_LOCAL (info, entry->d.h) + && BFINFDPIC_SYM_LOCAL (info, entry->d.h) + && !(info->executable && !info->pie)) + { + reloc = R_BFIN_FUNCDESC; + idx = elf_section_data (entry->d.h->root.u.def.section + ->output_section)->dynindx; + ad = entry->d.h->root.u.def.section->output_offset + + entry->d.h->root.u.def.value; + } + else if (entry->symndx == -1 + && ! BFINFDPIC_FUNCDESC_LOCAL (info, entry->d.h)) + { + reloc = R_BFIN_FUNCDESC; + idx = dynindx; + ad = addend; + if (ad) + return FALSE; + } + else + { + /* Otherwise, we know we have a private function descriptor, + so reference it directly. */ + if (elf_hash_table (info)->dynamic_sections_created) + BFD_ASSERT (entry->privfd); + reloc = R_byte4_data; + idx = elf_section_data (bfinfdpic_got_section (info) + ->output_section)->dynindx; + ad = bfinfdpic_got_section (info)->output_offset + + bfinfdpic_got_initial_offset (info) + entry->fd_entry; + } + + /* If there is room for dynamic symbol resolution, emit the + dynamic relocation. However, if we're linking an + executable at a fixed location, we won't have emitted a + dynamic symbol entry for the got section, so idx will be + zero, which means we can and should compute the address + of the private descriptor ourselves. */ + if (info->executable && !info->pie + && (entry->symndx != -1 + || BFINFDPIC_FUNCDESC_LOCAL (info, entry->d.h))) + { + ad += bfinfdpic_got_section (info)->output_section->vma; + _bfinfdpic_add_rofixup (output_bfd, + bfinfdpic_gotfixup_section (info), + bfinfdpic_got_section (info) + ->output_section->vma + + bfinfdpic_got_section (info) + ->output_offset + + bfinfdpic_got_initial_offset (info) + + entry->fdgot_entry, entry); + } + else + _bfinfdpic_add_dyn_reloc (output_bfd, + bfinfdpic_gotrel_section (info), + _bfd_elf_section_offset + (output_bfd, info, + bfinfdpic_got_section (info), + bfinfdpic_got_initial_offset (info) + + entry->fdgot_entry) + + bfinfdpic_got_section (info) + ->output_section->vma + + bfinfdpic_got_section (info) + ->output_offset, + reloc, idx, ad, entry); + } + + bfd_put_32 (output_bfd, ad, + bfinfdpic_got_section (info)->contents + + bfinfdpic_got_initial_offset (info) + + entry->fdgot_entry); + } + + /* Generate relocation to fill in a private function descriptor in + the GOT. */ + if (entry->fd_entry) + { + int idx = dynindx; + bfd_vma ad = addend; + bfd_vma ofst; + long lowword, highword; + + /* If the symbol is dynamic but binds locally, use + section+offset. */ + if (sec && (entry->symndx != -1 + || BFINFDPIC_SYM_LOCAL (info, entry->d.h))) + { + if (entry->symndx == -1) + ad += entry->d.h->root.u.def.value; + else + ad += sym->st_value; + ad += sec->output_offset; + if (sec->output_section && elf_section_data (sec->output_section)) + idx = elf_section_data (sec->output_section)->dynindx; + else + idx = 0; + } + + /* If we're linking an executable at a fixed address, we can + omit the dynamic relocation as long as the symbol is local to + this module. */ + if (info->executable && !info->pie + && (entry->symndx != -1 || BFINFDPIC_SYM_LOCAL (info, entry->d.h))) + { + if (sec) + ad += sec->output_section->vma; + ofst = 0; + if (entry->symndx != -1 + || entry->d.h->root.type != bfd_link_hash_undefweak) + { + _bfinfdpic_add_rofixup (output_bfd, + bfinfdpic_gotfixup_section (info), + bfinfdpic_got_section (info) + ->output_section->vma + + bfinfdpic_got_section (info) + ->output_offset + + bfinfdpic_got_initial_offset (info) + + entry->fd_entry, entry); + _bfinfdpic_add_rofixup (output_bfd, + bfinfdpic_gotfixup_section (info), + bfinfdpic_got_section (info) + ->output_section->vma + + bfinfdpic_got_section (info) + ->output_offset + + bfinfdpic_got_initial_offset (info) + + entry->fd_entry + 4, entry); + } + } + else + { + ofst + = _bfinfdpic_add_dyn_reloc (output_bfd, + entry->lazyplt + ? bfinfdpic_pltrel_section (info) + : bfinfdpic_gotrel_section (info), + _bfd_elf_section_offset + (output_bfd, info, + bfinfdpic_got_section (info), + bfinfdpic_got_initial_offset (info) + + entry->fd_entry) + + bfinfdpic_got_section (info) + ->output_section->vma + + bfinfdpic_got_section (info) + ->output_offset, + R_BFIN_FUNCDESC_VALUE, idx, ad, entry); + } + + /* If we've omitted the dynamic relocation, just emit the fixed + addresses of the symbol and of the local GOT base offset. */ + if (info->executable && !info->pie && sec && sec->output_section) + { + lowword = ad; + highword = bfinfdpic_got_section (info)->output_section->vma + + bfinfdpic_got_section (info)->output_offset + + bfinfdpic_got_initial_offset (info); + } + else if (entry->lazyplt) + { + if (ad) + return FALSE; + + fd_lazy_rel_offset = ofst; + + /* A function descriptor used for lazy or local resolving is + initialized such that its high word contains the output + section index in which the PLT entries are located, and + the low word contains the address of the lazy PLT entry + entry point, that must be within the memory region + assigned to that section. */ + lowword = entry->lzplt_entry + 4 + + bfinfdpic_plt_section (info)->output_offset + + bfinfdpic_plt_section (info)->output_section->vma; + highword = _bfinfdpic_osec_to_segment + (output_bfd, bfinfdpic_plt_section (info)->output_section); + } + else + { + /* A function descriptor for a local function gets the index + of the section. For a non-local function, it's + disregarded. */ + lowword = ad; + if (entry->symndx == -1 && entry->d.h->dynindx != -1 + && entry->d.h->dynindx == idx) + highword = 0; + else + highword = _bfinfdpic_osec_to_segment + (output_bfd, sec->output_section); + } + + bfd_put_32 (output_bfd, lowword, + bfinfdpic_got_section (info)->contents + + bfinfdpic_got_initial_offset (info) + + entry->fd_entry); + bfd_put_32 (output_bfd, highword, + bfinfdpic_got_section (info)->contents + + bfinfdpic_got_initial_offset (info) + + entry->fd_entry + 4); + } + + /* Generate code for the PLT entry. */ + if (entry->plt_entry != (bfd_vma) -1) + { + bfd_byte *plt_code = bfinfdpic_plt_section (info)->contents + + entry->plt_entry; + + BFD_ASSERT (entry->fd_entry); + + /* Figure out what kind of PLT entry we need, depending on the + location of the function descriptor within the GOT. */ + if (entry->fd_entry >= -(1 << (18 - 1)) + && entry->fd_entry + 4 < (1 << (18 - 1))) + { + /* P1 = [P3 + fd_entry]; P3 = [P3 + fd_entry + 4] */ + bfd_put_32 (output_bfd, + 0xe519 | ((entry->fd_entry << 14) & 0xFFFF0000), + plt_code); + bfd_put_32 (output_bfd, + 0xe51b | (((entry->fd_entry + 4) << 14) & 0xFFFF0000), + plt_code + 4); + plt_code += 8; + } + else + { + /* P1.L = fd_entry; P1.H = fd_entry; + P3 = P3 + P1; + P1 = [P3]; + P3 = [P3 + 4]; */ + bfd_put_32 (output_bfd, + 0xe109 | (entry->fd_entry << 16), + plt_code); + bfd_put_32 (output_bfd, + 0xe149 | (entry->fd_entry & 0xFFFF0000), + plt_code + 4); + bfd_put_16 (output_bfd, 0x5ad9, plt_code + 8); + bfd_put_16 (output_bfd, 0x9159, plt_code + 10); + bfd_put_16 (output_bfd, 0xac5b, plt_code + 12); + plt_code += 14; + } + /* JUMP (P1) */ + bfd_put_16 (output_bfd, 0x0051, plt_code); + } + + /* Generate code for the lazy PLT entry. */ + if (entry->lzplt_entry != (bfd_vma) -1) + { + bfd_byte *lzplt_code = bfinfdpic_plt_section (info)->contents + + entry->lzplt_entry; + bfd_vma resolverStub_addr; + + bfd_put_32 (output_bfd, fd_lazy_rel_offset, lzplt_code); + lzplt_code += 4; + + resolverStub_addr = entry->lzplt_entry / BFINFDPIC_LZPLT_BLOCK_SIZE + * BFINFDPIC_LZPLT_BLOCK_SIZE + BFINFDPIC_LZPLT_RESOLV_LOC; + if (resolverStub_addr >= bfinfdpic_plt_initial_offset (info)) + resolverStub_addr = bfinfdpic_plt_initial_offset (info) - LZPLT_NORMAL_SIZE - LZPLT_RESOLVER_EXTRA; + + if (entry->lzplt_entry == resolverStub_addr) + { + /* This is a lazy PLT entry that includes a resolver call. + P2 = [P3]; + R3 = [P3 + 4]; + JUMP (P2); */ + bfd_put_32 (output_bfd, + 0xa05b915a, + lzplt_code); + bfd_put_16 (output_bfd, 0x0052, lzplt_code + 4); + } + else + { + /* JUMP.S resolverStub */ + bfd_put_16 (output_bfd, + 0x2000 + | (((resolverStub_addr - entry->lzplt_entry) + / 2) & (((bfd_vma)1 << 12) - 1)), + lzplt_code); + } + } + + return TRUE; +} + /* Look through the relocs for a section during the first phase, and allocate space in the global offset table or procedure linkage @@ -1031,6 +2063,746 @@ elf32_bfin_reloc_type_class (const Elf_Internal_Rela * rela) return reloc_class_normal; } } + +/* Relocate an Blackfin ELF section. + + The RELOCATE_SECTION function is called by the new ELF backend linker + to handle the relocations for a section. + + The relocs are always passed as Rela structures; if the section + actually uses Rel structures, the r_addend field will always be + zero. + + This function is responsible for adjusting the section contents as + necessary, and (if using Rela relocs and generating a relocatable + output file) adjusting the reloc addend as necessary. + + This function does not have to worry about setting the reloc + address or the reloc symbol index. + + LOCAL_SYMS is a pointer to the swapped in local symbols. + + LOCAL_SECTIONS is an array giving the section in the input file + corresponding to the st_shndx field of each local symbol. + + The global hash table entry for the global symbols can be found + via elf_sym_hashes (input_bfd). + + When generating relocatable output, this function must handle + STB_LOCAL/STT_SECTION symbols specially. The output symbol is + going to be the section symbol corresponding to the output + section, which means that the addend must be adjusted + accordingly. */ + +static bfd_boolean +bfinfdpic_relocate_section (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; + struct elf_link_hash_entry **sym_hashes; + Elf_Internal_Rela *rel; + Elf_Internal_Rela *relend; + unsigned isec_segment, got_segment, plt_segment, + check_segment[2]; + int silence_segment_error = !(info->shared || info->pie); + + if (info->relocatable) + return TRUE; + + symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; + sym_hashes = elf_sym_hashes (input_bfd); + relend = relocs + input_section->reloc_count; + + isec_segment = _bfinfdpic_osec_to_segment (output_bfd, + input_section->output_section); + if (IS_FDPIC (output_bfd) && bfinfdpic_got_section (info)) + got_segment = _bfinfdpic_osec_to_segment (output_bfd, + bfinfdpic_got_section (info) + ->output_section); + else + got_segment = -1; + if (IS_FDPIC (output_bfd) && elf_hash_table (info)->dynamic_sections_created) + plt_segment = _bfinfdpic_osec_to_segment (output_bfd, + bfinfdpic_plt_section (info) + ->output_section); + else + plt_segment = -1; + + for (rel = relocs; rel < relend; rel ++) + { + reloc_howto_type *howto; + unsigned long r_symndx; + Elf_Internal_Sym *sym; + asection *sec; + struct elf_link_hash_entry *h; + bfd_vma relocation; + bfd_reloc_status_type r; + const char * name = NULL; + int r_type; + asection *osec; + struct bfinfdpic_relocs_info *picrel; + bfd_vma orig_addend = rel->r_addend; + + r_type = ELF32_R_TYPE (rel->r_info); + + if (r_type == R_BFIN_GNU_VTINHERIT + || r_type == R_BFIN_GNU_VTENTRY) + continue; + + /* This is a final link. */ + r_symndx = ELF32_R_SYM (rel->r_info); + howto = bfin_reloc_type_lookup (input_bfd, r_type); + if (howto == NULL) + { + bfd_set_error (bfd_error_bad_value); + return FALSE; + } + + h = NULL; + sym = NULL; + sec = NULL; + + if (r_symndx < symtab_hdr->sh_info) + { + sym = local_syms + r_symndx; + osec = sec = local_sections [r_symndx]; + relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); + + name = bfd_elf_string_from_elf_section + (input_bfd, symtab_hdr->sh_link, sym->st_name); + name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name; + } + 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; + + name = h->root.root.string; + + if ((h->root.type == bfd_link_hash_defined + || h->root.type == bfd_link_hash_defweak) + && ! BFINFDPIC_SYM_LOCAL (info, h)) + { + sec = NULL; + relocation = 0; + } + else + if (h->root.type == bfd_link_hash_defined + || h->root.type == bfd_link_hash_defweak) + { + sec = h->root.u.def.section; + relocation = (h->root.u.def.value + + sec->output_section->vma + + sec->output_offset); + } + else if (h->root.type == bfd_link_hash_undefweak) + { + relocation = 0; + } + else if (info->unresolved_syms_in_objects == RM_IGNORE + && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) + relocation = 0; + else + { + if (! ((*info->callbacks->undefined_symbol) + (info, h->root.root.string, input_bfd, + input_section, rel->r_offset, + (info->unresolved_syms_in_objects == RM_GENERATE_ERROR + || ELF_ST_VISIBILITY (h->other))))) + return FALSE; + relocation = 0; + } + osec = sec; + } + + switch (r_type) + { + case R_pcrel24: + case R_pcrel24_jump_l: + case R_byte4_data: + if (! IS_FDPIC (output_bfd)) + goto non_fdpic; + + case R_BFIN_GOT17M4: + case R_BFIN_GOTHI: + case R_BFIN_GOTLO: + case R_BFIN_FUNCDESC_GOT17M4: + case R_BFIN_FUNCDESC_GOTHI: + case R_BFIN_FUNCDESC_GOTLO: + case R_BFIN_GOTOFF17M4: + case R_BFIN_GOTOFFHI: + case R_BFIN_GOTOFFLO: + case R_BFIN_FUNCDESC_GOTOFF17M4: + case R_BFIN_FUNCDESC_GOTOFFHI: + case R_BFIN_FUNCDESC_GOTOFFLO: + case R_BFIN_FUNCDESC: + case R_BFIN_FUNCDESC_VALUE: + if (h != NULL) + picrel = bfinfdpic_relocs_info_for_global (bfinfdpic_relocs_info + (info), input_bfd, h, + orig_addend, INSERT); + else + /* In order to find the entry we created before, we must + use the original addend, not the one that may have been + modified by _bfd_elf_rela_local_sym(). */ + picrel = bfinfdpic_relocs_info_for_local (bfinfdpic_relocs_info + (info), input_bfd, r_symndx, + orig_addend, INSERT); + if (! picrel) + return FALSE; + + if (!_bfinfdpic_emit_got_relocs_plt_entries (picrel, output_bfd, info, + osec, sym, + rel->r_addend)) + { + (*_bfd_error_handler) + (_("%B: relocation at `%A+0x%x' references symbol `%s' with nonzero addend"), + input_bfd, input_section, rel->r_offset, name); + return FALSE; + + } + + break; + + default: + non_fdpic: + picrel = NULL; + if (h && ! BFINFDPIC_SYM_LOCAL (info, h)) + { + info->callbacks->warning + (info, _("relocation references symbol not defined in the module"), + name, input_bfd, input_section, rel->r_offset); + return FALSE; + } + break; + } + + switch (r_type) + { + case R_pcrel24: + case R_pcrel24_jump_l: + check_segment[0] = isec_segment; + if (! IS_FDPIC (output_bfd)) + check_segment[1] = isec_segment; + else if (picrel->plt) + { + relocation = bfinfdpic_plt_section (info)->output_section->vma + + bfinfdpic_plt_section (info)->output_offset + + picrel->plt_entry; + check_segment[1] = plt_segment; + } + /* We don't want to warn on calls to undefined weak symbols, + as calls to them must be protected by non-NULL tests + anyway, and unprotected calls would invoke undefined + behavior. */ + else if (picrel->symndx == -1 + && picrel->d.h->root.type == bfd_link_hash_undefweak) + check_segment[1] = check_segment[0]; + else + check_segment[1] = sec + ? _bfinfdpic_osec_to_segment (output_bfd, sec->output_section) + : (unsigned)-1; + break; + + case R_BFIN_GOT17M4: + case R_BFIN_GOTHI: + case R_BFIN_GOTLO: + relocation = picrel->got_entry; + check_segment[0] = check_segment[1] = got_segment; + break; + + case R_BFIN_FUNCDESC_GOT17M4: + case R_BFIN_FUNCDESC_GOTHI: + case R_BFIN_FUNCDESC_GOTLO: + relocation = picrel->fdgot_entry; + check_segment[0] = check_segment[1] = got_segment; + break; + + case R_BFIN_GOTOFFHI: + case R_BFIN_GOTOFF17M4: + case R_BFIN_GOTOFFLO: + relocation -= bfinfdpic_got_section (info)->output_section->vma + + bfinfdpic_got_section (info)->output_offset + + bfinfdpic_got_initial_offset (info); + check_segment[0] = got_segment; + check_segment[1] = sec + ? _bfinfdpic_osec_to_segment (output_bfd, sec->output_section) + : (unsigned)-1; + break; + + case R_BFIN_FUNCDESC_GOTOFF17M4: + case R_BFIN_FUNCDESC_GOTOFFHI: + case R_BFIN_FUNCDESC_GOTOFFLO: + relocation = picrel->fd_entry; + check_segment[0] = check_segment[1] = got_segment; + break; + + case R_BFIN_FUNCDESC: + { + int dynindx; + bfd_vma addend = rel->r_addend; + + if (! (h && h->root.type == bfd_link_hash_undefweak + && BFINFDPIC_SYM_LOCAL (info, h))) + { + /* If the symbol is dynamic and there may be dynamic + symbol resolution because we are or are linked with a + shared library, emit a FUNCDESC relocation such that + the dynamic linker will allocate the function + descriptor. If the symbol needs a non-local function + descriptor but binds locally (e.g., its visibility is + protected, emit a dynamic relocation decayed to + section+offset. */ + if (h && ! BFINFDPIC_FUNCDESC_LOCAL (info, h) + && BFINFDPIC_SYM_LOCAL (info, h) + && !(info->executable && !info->pie)) + { + dynindx = elf_section_data (h->root.u.def.section + ->output_section)->dynindx; + addend += h->root.u.def.section->output_offset + + h->root.u.def.value; + } + else if (h && ! BFINFDPIC_FUNCDESC_LOCAL (info, h)) + { + if (addend) + { + info->callbacks->warning + (info, _("R_BFIN_FUNCDESC references dynamic symbol with nonzero addend"), + name, input_bfd, input_section, rel->r_offset); + return FALSE; + } + dynindx = h->dynindx; + } + else + { + /* Otherwise, we know we have a private function + descriptor, so reference it directly. */ + BFD_ASSERT (picrel->privfd); + r_type = R_byte4_data; + dynindx = elf_section_data (bfinfdpic_got_section (info) + ->output_section)->dynindx; + addend = bfinfdpic_got_section (info)->output_offset + + bfinfdpic_got_initial_offset (info) + + picrel->fd_entry; + } + + /* If there is room for dynamic symbol resolution, emit + the dynamic relocation. However, if we're linking an + executable at a fixed location, we won't have emitted a + dynamic symbol entry for the got section, so idx will + be zero, which means we can and should compute the + address of the private descriptor ourselves. */ + if (info->executable && !info->pie + && (!h || BFINFDPIC_FUNCDESC_LOCAL (info, h))) + { + addend += bfinfdpic_got_section (info)->output_section->vma; + if ((bfd_get_section_flags (output_bfd, + input_section->output_section) + & (SEC_ALLOC | SEC_LOAD)) == (SEC_ALLOC | SEC_LOAD)) + { + if (_bfinfdpic_osec_readonly_p (output_bfd, + input_section + ->output_section)) + { + info->callbacks->warning + (info, + _("cannot emit fixups in read-only section"), + name, input_bfd, input_section, rel->r_offset); + return FALSE; + } + _bfinfdpic_add_rofixup (output_bfd, + bfinfdpic_gotfixup_section + (info), + _bfd_elf_section_offset + (output_bfd, info, + input_section, rel->r_offset) + + input_section + ->output_section->vma + + input_section->output_offset, + picrel); + } + } + else if ((bfd_get_section_flags (output_bfd, + input_section->output_section) + & (SEC_ALLOC | SEC_LOAD)) == (SEC_ALLOC | SEC_LOAD)) + { + if (_bfinfdpic_osec_readonly_p (output_bfd, + input_section + ->output_section)) + { + info->callbacks->warning + (info, + _("cannot emit dynamic relocations in read-only section"), + name, input_bfd, input_section, rel->r_offset); + return FALSE; + } + _bfinfdpic_add_dyn_reloc (output_bfd, + bfinfdpic_gotrel_section (info), + _bfd_elf_section_offset + (output_bfd, info, + input_section, rel->r_offset) + + input_section + ->output_section->vma + + input_section->output_offset, + r_type, dynindx, addend, picrel); + } + else + addend += bfinfdpic_got_section (info)->output_section->vma; + } + + /* We want the addend in-place because dynamic + relocations are REL. Setting relocation to it should + arrange for it to be installed. */ + relocation = addend - rel->r_addend; + } + check_segment[0] = check_segment[1] = got_segment; + break; + + case R_byte4_data: + if (! IS_FDPIC (output_bfd)) + { + check_segment[0] = check_segment[1] = -1; + break; + } + /* Fall through. */ + case R_BFIN_FUNCDESC_VALUE: + { + int dynindx; + bfd_vma addend = rel->r_addend; + + /* If the symbol is dynamic but binds locally, use + section+offset. */ + if (h && ! BFINFDPIC_SYM_LOCAL (info, h)) + { + if (addend && r_type == R_BFIN_FUNCDESC_VALUE) + { + info->callbacks->warning + (info, _("R_BFIN_FUNCDESC_VALUE references dynamic symbol with nonzero addend"), + name, input_bfd, input_section, rel->r_offset); + return FALSE; + } + dynindx = h->dynindx; + } + else + { + if (h) + addend += h->root.u.def.value; + else + addend += sym->st_value; + if (osec) + addend += osec->output_offset; + if (osec && osec->output_section + && ! bfd_is_abs_section (osec->output_section) + && ! bfd_is_und_section (osec->output_section)) + dynindx = elf_section_data (osec->output_section)->dynindx; + else + dynindx = 0; + } + + /* If we're linking an executable at a fixed address, we + can omit the dynamic relocation as long as the symbol + is defined in the current link unit (which is implied + by its output section not being NULL). */ + if (info->executable && !info->pie + && (!h || BFINFDPIC_SYM_LOCAL (info, h))) + { + if (osec) + addend += osec->output_section->vma; + if (IS_FDPIC (input_bfd) + && (bfd_get_section_flags (output_bfd, + input_section->output_section) + & (SEC_ALLOC | SEC_LOAD)) == (SEC_ALLOC | SEC_LOAD)) + { + if (_bfinfdpic_osec_readonly_p (output_bfd, + input_section + ->output_section)) + { + info->callbacks->warning + (info, + _("cannot emit fixups in read-only section"), + name, input_bfd, input_section, rel->r_offset); + return FALSE; + } + if (!h || h->root.type != bfd_link_hash_undefweak) + { + _bfinfdpic_add_rofixup (output_bfd, + bfinfdpic_gotfixup_section + (info), + _bfd_elf_section_offset + (output_bfd, info, + input_section, rel->r_offset) + + input_section + ->output_section->vma + + input_section->output_offset, + picrel); + if (r_type == R_BFIN_FUNCDESC_VALUE) + _bfinfdpic_add_rofixup + (output_bfd, + bfinfdpic_gotfixup_section (info), + _bfd_elf_section_offset + (output_bfd, info, + input_section, rel->r_offset) + + input_section->output_section->vma + + input_section->output_offset + 4, picrel); + } + } + } + else + { + if ((bfd_get_section_flags (output_bfd, + input_section->output_section) + & (SEC_ALLOC | SEC_LOAD)) == (SEC_ALLOC | SEC_LOAD)) + { + if (_bfinfdpic_osec_readonly_p (output_bfd, + input_section + ->output_section)) + { + info->callbacks->warning + (info, + _("cannot emit dynamic relocations in read-only section"), + name, input_bfd, input_section, rel->r_offset); + return FALSE; + } + _bfinfdpic_add_dyn_reloc (output_bfd, + bfinfdpic_gotrel_section (info), + _bfd_elf_section_offset + (output_bfd, info, + input_section, rel->r_offset) + + input_section + ->output_section->vma + + input_section->output_offset, + r_type, dynindx, addend, picrel); + } + else if (osec) + addend += osec->output_section->vma; + /* We want the addend in-place because dynamic + relocations are REL. Setting relocation to it + should arrange for it to be installed. */ + relocation = addend - rel->r_addend; + } + + if (r_type == R_BFIN_FUNCDESC_VALUE) + { + /* If we've omitted the dynamic relocation, just emit + the fixed addresses of the symbol and of the local + GOT base offset. */ + if (info->executable && !info->pie + && (!h || BFINFDPIC_SYM_LOCAL (info, h))) + bfd_put_32 (output_bfd, + bfinfdpic_got_section (info)->output_section->vma + + bfinfdpic_got_section (info)->output_offset + + bfinfdpic_got_initial_offset (info), + contents + rel->r_offset + 4); + else + /* A function descriptor used for lazy or local + resolving is initialized such that its high word + contains the output section index in which the + PLT entries are located, and the low word + contains the offset of the lazy PLT entry entry + point into that section. */ + bfd_put_32 (output_bfd, + h && ! BFINFDPIC_SYM_LOCAL (info, h) + ? 0 + : _bfinfdpic_osec_to_segment (output_bfd, + sec + ->output_section), + contents + rel->r_offset + 4); + } + } + check_segment[0] = check_segment[1] = got_segment; + break; + + default: + check_segment[0] = isec_segment; + check_segment[1] = sec + ? _bfinfdpic_osec_to_segment (output_bfd, sec->output_section) + : (unsigned)-1; + break; + } + + if (check_segment[0] != check_segment[1] && IS_FDPIC (output_bfd)) + { +#if 1 /* If you take this out, remove the #error from fdpic-static-6.d + in the ld testsuite. */ + /* This helps catch problems in GCC while we can't do more + than static linking. The idea is to test whether the + input file basename is crt0.o only once. */ + if (silence_segment_error == 1) + silence_segment_error = + (strlen (input_bfd->filename) == 6 + && strcmp (input_bfd->filename, "crt0.o") == 0) + || (strlen (input_bfd->filename) > 6 + && strcmp (input_bfd->filename + + strlen (input_bfd->filename) - 7, + "/crt0.o") == 0) + ? -1 : 0; +#endif + if (!silence_segment_error + /* We don't want duplicate errors for undefined + symbols. */ + && !(picrel && picrel->symndx == -1 + && picrel->d.h->root.type == bfd_link_hash_undefined)) + info->callbacks->warning + (info, + (info->shared || info->pie) + ? _("relocations between different segments are not supported") + : _("warning: relocation references a different segment"), + name, input_bfd, input_section, rel->r_offset); + if (!silence_segment_error && (info->shared || info->pie)) + return FALSE; + elf_elfheader (output_bfd)->e_flags |= EF_BFIN_PIC; + } + + switch (r_type) + { + case R_BFIN_GOTOFFHI: + /* We need the addend to be applied before we shift the + value right. */ + relocation += rel->r_addend; + /* Fall through. */ + case R_BFIN_GOTHI: + case R_BFIN_FUNCDESC_GOTHI: + case R_BFIN_FUNCDESC_GOTOFFHI: + relocation >>= 16; + /* Fall through. */ + + case R_BFIN_GOTLO: + case R_BFIN_FUNCDESC_GOTLO: + case R_BFIN_GOTOFFLO: + case R_BFIN_FUNCDESC_GOTOFFLO: + relocation &= 0xffff; + break; + + default: + break; + } + + switch (r_type) + { + case R_pcrel24: + case R_pcrel24_jump_l: + if (! IS_FDPIC (output_bfd) || ! picrel->plt) + break; + /* Fall through. */ + + /* When referencing a GOT entry, a function descriptor or a + PLT, we don't want the addend to apply to the reference, + but rather to the referenced symbol. The actual entry + will have already been created taking the addend into + account, so cancel it out here. */ + case R_BFIN_GOT17M4: + case R_BFIN_GOTHI: + case R_BFIN_GOTLO: + case R_BFIN_FUNCDESC_GOT17M4: + case R_BFIN_FUNCDESC_GOTHI: + case R_BFIN_FUNCDESC_GOTLO: + case R_BFIN_FUNCDESC_GOTOFF17M4: + case R_BFIN_FUNCDESC_GOTOFFHI: + case R_BFIN_FUNCDESC_GOTOFFLO: + /* Note that we only want GOTOFFHI, not GOTOFFLO or GOTOFF17M4 + here, since we do want to apply the addend to the others. + Note that we've applied the addend to GOTOFFHI before we + shifted it right. */ + case R_BFIN_GOTOFFHI: + relocation -= rel->r_addend; + break; + + default: + break; + } + + if (r_type == R_pcrel24 + || r_type == R_pcrel24_jump_l) + { + bfd_vma x; + bfd_vma address = rel->r_offset; + + relocation += rel->r_addend; + + /* Perform usual pc-relative correction. */ + relocation -= input_section->output_section->vma + input_section->output_offset; + relocation -= address; + + /* We are getting reloc_entry->address 2 byte off from + the start of instruction. Assuming absolute postion + of the reloc data. But, following code had been written assuming + reloc address is starting at begining of instruction. + To compensate that I have increased the value of + relocation by 1 (effectively 2) and used the addr -2 instead of addr. */ + + relocation += 2; + address -= 2; + + relocation >>= 1; + + x = bfd_get_16 (input_bfd, contents + address); + x = (x & 0xff00) | ((relocation >> 16) & 0xff); + bfd_put_16 (input_bfd, x, contents + address); + + x = bfd_get_16 (input_bfd, contents + address + 2); + x = relocation & 0xFFFF; + bfd_put_16 (input_bfd, x, contents + address + 2); + r = bfd_reloc_ok; + } + else + r = _bfd_final_link_relocate (howto, input_bfd, input_section, + contents, rel->r_offset, + relocation, rel->r_addend); + + if (r != bfd_reloc_ok) + { + const char * msg = (const char *) NULL; + + switch (r) + { + case bfd_reloc_overflow: + r = info->callbacks->reloc_overflow + (info, (h ? &h->root : NULL), name, howto->name, + (bfd_vma) 0, input_bfd, input_section, rel->r_offset); + break; + + case bfd_reloc_undefined: + r = info->callbacks->undefined_symbol + (info, name, input_bfd, input_section, rel->r_offset, TRUE); + break; + + case bfd_reloc_outofrange: + msg = _("internal error: out of range error"); + break; + + case bfd_reloc_notsupported: + msg = _("internal error: unsupported relocation error"); + break; + + case bfd_reloc_dangerous: + msg = _("internal error: dangerous relocation"); + break; + + default: + msg = _("internal error: unknown error"); + break; + } + + if (msg) + r = info->callbacks->warning + (info, msg, name, input_bfd, input_section, rel->r_offset); + + if (! r) + return FALSE; + } + } + + return TRUE; +} static bfd_boolean bfin_relocate_section (bfd * output_bfd, @@ -1366,6 +3138,17 @@ bfin_gc_mark_hook (asection * sec, /* Update the got entry reference counts for the section being removed. */ static bfd_boolean +bfinfdpic_gc_sweep_hook (bfd *abfd ATTRIBUTE_UNUSED, + struct bfd_link_info *info ATTRIBUTE_UNUSED, + asection *sec ATTRIBUTE_UNUSED, + const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED) +{ + return TRUE; +} + +/* Update the got entry reference counts for the section being removed. */ + +static bfd_boolean bfin_gc_sweep_hook (bfd * abfd, struct bfd_link_info *info, asection * sec, @@ -1433,35 +3216,1527 @@ bfin_gc_sweep_hook (bfd * abfd, break; } } + return TRUE; +} + +/* We need dynamic symbols for every section, since segments can + relocate independently. */ +static bfd_boolean +_bfinfdpic_link_omit_section_dynsym (bfd *output_bfd ATTRIBUTE_UNUSED, + struct bfd_link_info *info + ATTRIBUTE_UNUSED, + asection *p ATTRIBUTE_UNUSED) +{ + switch (elf_section_data (p)->this_hdr.sh_type) + { + case SHT_PROGBITS: + case SHT_NOBITS: + /* If sh_type is yet undecided, assume it could be + SHT_PROGBITS/SHT_NOBITS. */ + case SHT_NULL: + return FALSE; + + /* There shouldn't be section relative relocations + against any other section. */ + default: + return TRUE; + } +} + +/* Create a .got section, as well as its additional info field. This + is almost entirely copied from + elflink.c:_bfd_elf_create_got_section(). */ + +static bfd_boolean +_bfin_create_got_section (bfd *abfd, struct bfd_link_info *info) +{ + flagword flags, pltflags; + asection *s; + struct elf_link_hash_entry *h; + struct bfd_link_hash_entry *bh; + const struct elf_backend_data *bed = get_elf_backend_data (abfd); + int ptralign; + int offset; + + /* This function may be called more than once. */ + s = bfd_get_section_by_name (abfd, ".got"); + if (s != NULL && (s->flags & SEC_LINKER_CREATED) != 0) + return TRUE; + + /* Machine specific: although pointers are 32-bits wide, we want the + GOT to be aligned to a 64-bit boundary, such that function + descriptors in it can be accessed with 64-bit loads and + stores. */ + ptralign = 3; + + flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY + | SEC_LINKER_CREATED); + pltflags = flags; + + s = bfd_make_section_with_flags (abfd, ".got", flags); + if (s == NULL + || !bfd_set_section_alignment (abfd, s, ptralign)) + return FALSE; + + if (bed->want_got_plt) + { + s = bfd_make_section_with_flags (abfd, ".got.plt", flags); + if (s == NULL + || !bfd_set_section_alignment (abfd, s, ptralign)) + return FALSE; + } + + if (bed->want_got_sym) + { + /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got + (or .got.plt) section. We don't do this in the linker script + because we don't want to define the symbol if we are not creating + a global offset table. */ + h = _bfd_elf_define_linkage_sym (abfd, info, s, "_GLOBAL_OFFSET_TABLE_"); + elf_hash_table (info)->hgot = h; + if (h == NULL) + return FALSE; + + /* Machine-specific: we want the symbol for executables as + well. */ + if (! bfd_elf_link_record_dynamic_symbol (info, h)) + return FALSE; + } + + /* The first bit of the global offset table is the header. */ + s->size += bed->got_header_size; + + /* This is the machine-specific part. Create and initialize section + data for the got. */ + if (IS_FDPIC (abfd)) + { + bfinfdpic_got_section (info) = s; + bfinfdpic_relocs_info (info) = htab_try_create (1, + bfinfdpic_relocs_info_hash, + bfinfdpic_relocs_info_eq, + (htab_del) NULL); + if (! bfinfdpic_relocs_info (info)) + return FALSE; + + s = bfd_make_section_with_flags (abfd, ".rel.got", + (flags | SEC_READONLY)); + if (s == NULL + || ! bfd_set_section_alignment (abfd, s, 2)) + return FALSE; + + bfinfdpic_gotrel_section (info) = s; + + /* Machine-specific. */ + s = bfd_make_section_with_flags (abfd, ".rofixup", + (flags | SEC_READONLY)); + if (s == NULL + || ! bfd_set_section_alignment (abfd, s, 2)) + return FALSE; + + bfinfdpic_gotfixup_section (info) = s; + offset = -2048; + flags = BSF_GLOBAL; + } + else + { + offset = 2048; + flags = BSF_GLOBAL | BSF_WEAK; + } + + /* Define _gp in .rofixup, for FDPIC, or .got otherwise. If it + turns out that we're linking with a different linker script, the + linker script will override it. */ + bh = NULL; + if (!(_bfd_generic_link_add_one_symbol + (info, abfd, "_gp", flags, s, offset, (const char *) NULL, FALSE, + bed->collect, &bh))) + return FALSE; + h = (struct elf_link_hash_entry *) bh; + h->def_regular = 1; + h->type = STT_OBJECT; + /* h->other = STV_HIDDEN; */ /* Should we? */ + + /* Machine-specific: we want the symbol for executables as well. */ + if (IS_FDPIC (abfd) && ! bfd_elf_link_record_dynamic_symbol (info, h)) + return FALSE; return TRUE; } +/* Make sure the got and plt sections exist, and that our pointers in + the link hash table point to them. */ -/* Merge backend specific data from an object file to the output - object file when linking. */ static bfd_boolean -elf32_bfin_merge_private_bfd_data (bfd * ibfd, bfd * obfd) +elf32_bfinfdpic_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info) { - flagword out_flags; - flagword in_flags; + /* This is mostly copied from + elflink.c:_bfd_elf_create_dynamic_sections(). */ + flagword flags, pltflags; + asection *s; + const struct elf_backend_data *bed = get_elf_backend_data (abfd); + + /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and + .rel[a].bss sections. */ + + flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY + | SEC_LINKER_CREATED); + + pltflags = flags; + pltflags |= SEC_CODE; + if (bed->plt_not_loaded) + pltflags &= ~ (SEC_CODE | SEC_LOAD | SEC_HAS_CONTENTS); + if (bed->plt_readonly) + pltflags |= SEC_READONLY; + + s = bfd_make_section (abfd, ".plt"); + if (s == NULL + || ! bfd_set_section_flags (abfd, s, pltflags) + || ! bfd_set_section_alignment (abfd, s, bed->plt_alignment)) + return FALSE; + /* Blackfin-specific: remember it. */ + bfinfdpic_plt_section (info) = s; + + if (bed->want_plt_sym) + { + /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the + .plt section. */ + struct elf_link_hash_entry *h; + struct bfd_link_hash_entry *bh = NULL; - if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour - || bfd_get_flavour (obfd) != bfd_target_elf_flavour) + if (! (_bfd_generic_link_add_one_symbol + (info, abfd, "_PROCEDURE_LINKAGE_TABLE_", BSF_GLOBAL, s, 0, NULL, + FALSE, get_elf_backend_data (abfd)->collect, &bh))) + return FALSE; + h = (struct elf_link_hash_entry *) bh; + h->def_regular = 1; + h->type = STT_OBJECT; + + if (! info->executable + && ! bfd_elf_link_record_dynamic_symbol (info, h)) + return FALSE; + } + + /* Blackfin-specific: we want rel relocations for the plt. */ + s = bfd_make_section (abfd, ".rel.plt"); + if (s == NULL + || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY) + || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align)) + return FALSE; + /* Blackfin-specific: remember it. */ + bfinfdpic_pltrel_section (info) = s; + + /* Blackfin-specific: we want to create the GOT in the Blackfin way. */ + if (! _bfin_create_got_section (abfd, info)) + return FALSE; + + /* Blackfin-specific: make sure we created everything we wanted. */ + BFD_ASSERT (bfinfdpic_got_section (info) && bfinfdpic_gotrel_section (info) + /* && bfinfdpic_gotfixup_section (info) */ + && bfinfdpic_plt_section (info) + && bfinfdpic_pltrel_section (info)); + + if (bed->want_dynbss) + { + /* The .dynbss section is a place to put symbols which are defined + by dynamic objects, are referenced by regular objects, and are + not functions. We must allocate space for them in the process + image and use a R_*_COPY reloc to tell the dynamic linker to + initialize them at run time. The linker script puts the .dynbss + section into the .bss section of the final image. */ + s = bfd_make_section (abfd, ".dynbss"); + if (s == NULL + || ! bfd_set_section_flags (abfd, s, SEC_ALLOC | SEC_LINKER_CREATED)) + return FALSE; + + /* The .rel[a].bss section holds copy relocs. This section is not + normally needed. We need to create it here, though, so that the + linker will map it to an output section. We can't just create it + only if we need it, because we will not know whether we need it + until we have seen all the input files, and the first time the + main linker code calls BFD after examining all the input files + (size_dynamic_sections) the input sections have already been + mapped to the output sections. If the section turns out not to + be needed, we can discard it later. We will never need this + section when generating a shared object, since they do not use + copy relocs. */ + if (! info->shared) + { + s = bfd_make_section (abfd, + (bed->default_use_rela_p + ? ".rela.bss" : ".rel.bss")); + if (s == NULL + || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY) + || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align)) + return FALSE; + } + } + + return TRUE; +} + +/* The name of the dynamic interpreter. This is put in the .interp + section. */ + +#define ELF_DYNAMIC_INTERPRETER "/lib/ld.so.1" + +#define DEFAULT_STACK_SIZE 0x20000 + +/* This structure is used to collect the number of entries present in + each addressable range of the got. */ +struct _bfinfdpic_dynamic_got_info +{ + /* Several bits of information about the current link. */ + struct bfd_link_info *info; + /* Total size needed for GOT entries within the 18- or 32-bit + ranges. */ + bfd_vma got17m4, gothilo; + /* Total size needed for function descriptor entries within the 18- + or 32-bit ranges. */ + bfd_vma fd17m4, fdhilo; + /* Total size needed function descriptor entries referenced in PLT + entries, that would be profitable to place in offsets close to + the PIC register. */ + bfd_vma fdplt; + /* Total size needed by lazy PLT entries. */ + bfd_vma lzplt; + /* Number of relocations carried over from input object files. */ + unsigned long relocs; + /* Number of fixups introduced by relocations in input object files. */ + unsigned long fixups; +}; + +/* Compute the total GOT size required by each symbol in each range. + Symbols may require up to 4 words in the GOT: an entry pointing to + the symbol, an entry pointing to its function descriptor, and a + private function descriptors taking two words. */ + +static int +_bfinfdpic_count_got_plt_entries (void **entryp, void *dinfo_) +{ + struct bfinfdpic_relocs_info *entry = *entryp; + struct _bfinfdpic_dynamic_got_info *dinfo = dinfo_; + unsigned relocs = 0, fixups = 0; + + /* Allocate space for a GOT entry pointing to the symbol. */ + if (entry->got17m4) + dinfo->got17m4 += 4; + else if (entry->gothilo) + dinfo->gothilo += 4; + else + entry->relocs32--; + entry->relocs32++; + + /* Allocate space for a GOT entry pointing to the function + descriptor. */ + if (entry->fdgot17m4) + dinfo->got17m4 += 4; + else if (entry->fdgothilo) + dinfo->gothilo += 4; + else + entry->relocsfd--; + entry->relocsfd++; + + /* Decide whether we need a PLT entry, a function descriptor in the + GOT, and a lazy PLT entry for this symbol. */ + entry->plt = entry->call + && entry->symndx == -1 && ! BFINFDPIC_SYM_LOCAL (dinfo->info, entry->d.h) + && elf_hash_table (dinfo->info)->dynamic_sections_created; + entry->privfd = entry->plt + || entry->fdgoff17m4 || entry->fdgoffhilo + || ((entry->fd || entry->fdgot17m4 || entry->fdgothilo) + && (entry->symndx != -1 + || BFINFDPIC_FUNCDESC_LOCAL (dinfo->info, entry->d.h))); + entry->lazyplt = entry->privfd + && entry->symndx == -1 && ! BFINFDPIC_SYM_LOCAL (dinfo->info, entry->d.h) + && ! (dinfo->info->flags & DF_BIND_NOW) + && elf_hash_table (dinfo->info)->dynamic_sections_created; + + /* Allocate space for a function descriptor. */ + if (entry->fdgoff17m4) + dinfo->fd17m4 += 8; + else if (entry->privfd && entry->plt) + dinfo->fdplt += 8; + else if (entry->privfd) + dinfo->fdhilo += 8; + else + entry->relocsfdv--; + entry->relocsfdv++; + + if (entry->lazyplt) + dinfo->lzplt += LZPLT_NORMAL_SIZE; + + if (!dinfo->info->executable || dinfo->info->pie) + relocs = entry->relocs32 + entry->relocsfd + entry->relocsfdv; + else + { + if (entry->symndx != -1 || BFINFDPIC_SYM_LOCAL (dinfo->info, entry->d.h)) + { + if (entry->symndx != -1 + || entry->d.h->root.type != bfd_link_hash_undefweak) + fixups += entry->relocs32 + 2 * entry->relocsfdv; + } + else + relocs += entry->relocs32 + entry->relocsfdv; + + if (entry->symndx != -1 + || BFINFDPIC_FUNCDESC_LOCAL (dinfo->info, entry->d.h)) + { + if (entry->symndx != -1 + || entry->d.h->root.type != bfd_link_hash_undefweak) + fixups += entry->relocsfd; + } + else + relocs += entry->relocsfd; + } + + entry->dynrelocs += relocs; + entry->fixups += fixups; + dinfo->relocs += relocs; + dinfo->fixups += fixups; + + return 1; +} + +/* This structure is used to assign offsets to got entries, function + descriptors, plt entries and lazy plt entries. */ + +struct _bfinfdpic_dynamic_got_plt_info +{ + /* Summary information collected with _bfinfdpic_count_got_plt_entries. */ + struct _bfinfdpic_dynamic_got_info g; + + /* For each addressable range, we record a MAX (positive) and MIN + (negative) value. CUR is used to assign got entries, and it's + incremented from an initial positive value to MAX, then from MIN + to FDCUR (unless FDCUR wraps around first). FDCUR is used to + assign function descriptors, and it's decreased from an initial + non-positive value to MIN, then from MAX down to CUR (unless CUR + wraps around first). All of MIN, MAX, CUR and FDCUR always point + to even words. ODD, if non-zero, indicates an odd word to be + used for the next got entry, otherwise CUR is used and + incremented by a pair of words, wrapping around when it reaches + MAX. FDCUR is decremented (and wrapped) before the next function + descriptor is chosen. FDPLT indicates the number of remaining + slots that can be used for function descriptors used only by PLT + entries. */ + struct _bfinfdpic_dynamic_got_alloc_data + { + bfd_signed_vma max, cur, odd, fdcur, min; + bfd_vma fdplt; + } got17m4, gothilo; +}; + +/* Determine the positive and negative ranges to be used by each + offset range in the GOT. FDCUR and CUR, that must be aligned to a + double-word boundary, are the minimum (negative) and maximum + (positive) GOT offsets already used by previous ranges, except for + an ODD entry that may have been left behind. GOT and FD indicate + the size of GOT entries and function descriptors that must be + placed within the range from -WRAP to WRAP. If there's room left, + up to FDPLT bytes should be reserved for additional function + descriptors. */ + +inline static bfd_signed_vma +_bfinfdpic_compute_got_alloc_data (struct _bfinfdpic_dynamic_got_alloc_data *gad, + bfd_signed_vma fdcur, + bfd_signed_vma odd, + bfd_signed_vma cur, + bfd_vma got, + bfd_vma fd, + bfd_vma fdplt, + bfd_vma wrap) +{ + bfd_signed_vma wrapmin = -wrap; + + /* Start at the given initial points. */ + gad->fdcur = fdcur; + gad->cur = cur; + + /* If we had an incoming odd word and we have any got entries that + are going to use it, consume it, otherwise leave gad->odd at + zero. We might force gad->odd to zero and return the incoming + odd such that it is used by the next range, but then GOT entries + might appear to be out of order and we wouldn't be able to + shorten the GOT by one word if it turns out to end with an + unpaired GOT entry. */ + if (odd && got) + { + gad->odd = odd; + got -= 4; + odd = 0; + } + else + gad->odd = 0; + + /* If we're left with an unpaired GOT entry, compute its location + such that we can return it. Otherwise, if got doesn't require an + odd number of words here, either odd was already zero in the + block above, or it was set to zero because got was non-zero, or + got was already zero. In the latter case, we want the value of + odd to carry over to the return statement, so we don't want to + reset odd unless the condition below is true. */ + if (got & 4) + { + odd = cur + got; + got += 4; + } + + /* Compute the tentative boundaries of this range. */ + gad->max = cur + got; + gad->min = fdcur - fd; + gad->fdplt = 0; + + /* If function descriptors took too much space, wrap some of them + around. */ + if (gad->min < wrapmin) + { + gad->max += wrapmin - gad->min; + gad->min = wrapmin; + } + /* If there is space left and we have function descriptors + referenced in PLT entries that could take advantage of shorter + offsets, place them here. */ + else if (fdplt && gad->min > wrapmin) + { + bfd_vma fds; + if ((bfd_vma) (gad->min - wrapmin) < fdplt) + fds = gad->min - wrapmin; + else + fds = fdplt; + + fdplt -= fds; + gad->min -= fds; + gad->fdplt += fds; + } + + /* If GOT entries took too much space, wrap some of them around. + This may well cause gad->min to become lower than wrapmin. This + will cause a relocation overflow later on, so we don't have to + report it here . */ + if ((bfd_vma) gad->max > wrap) + { + gad->min -= gad->max - wrap; + gad->max = wrap; + } + /* If there is more space left, try to place some more function + descriptors for PLT entries. */ + else if (fdplt && (bfd_vma) gad->max < wrap) + { + bfd_vma fds; + if ((bfd_vma) (wrap - gad->max) < fdplt) + fds = wrap - gad->max; + else + fds = fdplt; + + fdplt -= fds; + gad->max += fds; + gad->fdplt += fds; + } + + /* If odd was initially computed as an offset past the wrap point, + wrap it around. */ + if (odd > gad->max) + odd = gad->min + odd - gad->max; + + /* _bfinfdpic_get_got_entry() below will always wrap gad->cur if needed + before returning, so do it here too. This guarantees that, + should cur and fdcur meet at the wrap point, they'll both be + equal to min. */ + if (gad->cur == gad->max) + gad->cur = gad->min; + + return odd; +} + +/* Compute the location of the next GOT entry, given the allocation + data for a range. */ + +inline static bfd_signed_vma +_bfinfdpic_get_got_entry (struct _bfinfdpic_dynamic_got_alloc_data *gad) +{ + bfd_signed_vma ret; + + if (gad->odd) + { + /* If there was an odd word left behind, use it. */ + ret = gad->odd; + gad->odd = 0; + } + else + { + /* Otherwise, use the word pointed to by cur, reserve the next + as an odd word, and skip to the next pair of words, possibly + wrapping around. */ + ret = gad->cur; + gad->odd = gad->cur + 4; + gad->cur += 8; + if (gad->cur == gad->max) + gad->cur = gad->min; + } + + return ret; +} + +/* Compute the location of the next function descriptor entry in the + GOT, given the allocation data for a range. */ + +inline static bfd_signed_vma +_bfinfdpic_get_fd_entry (struct _bfinfdpic_dynamic_got_alloc_data *gad) +{ + /* If we're at the bottom, wrap around, and only then allocate the + next pair of words. */ + if (gad->fdcur == gad->min) + gad->fdcur = gad->max; + return gad->fdcur -= 8; +} + +/* Assign GOT offsets for every GOT entry and function descriptor. + Doing everything in a single pass is tricky. */ + +static int +_bfinfdpic_assign_got_entries (void **entryp, void *info_) +{ + struct bfinfdpic_relocs_info *entry = *entryp; + struct _bfinfdpic_dynamic_got_plt_info *dinfo = info_; + + if (entry->got17m4) + entry->got_entry = _bfinfdpic_get_got_entry (&dinfo->got17m4); + else if (entry->gothilo) + entry->got_entry = _bfinfdpic_get_got_entry (&dinfo->gothilo); + + if (entry->fdgot17m4) + entry->fdgot_entry = _bfinfdpic_get_got_entry (&dinfo->got17m4); + else if (entry->fdgothilo) + entry->fdgot_entry = _bfinfdpic_get_got_entry (&dinfo->gothilo); + + if (entry->fdgoff17m4) + entry->fd_entry = _bfinfdpic_get_fd_entry (&dinfo->got17m4); + else if (entry->plt && dinfo->got17m4.fdplt) + { + dinfo->got17m4.fdplt -= 8; + entry->fd_entry = _bfinfdpic_get_fd_entry (&dinfo->got17m4); + } + else if (entry->plt) + { + dinfo->gothilo.fdplt -= 8; + entry->fd_entry = _bfinfdpic_get_fd_entry (&dinfo->gothilo); + } + else if (entry->privfd) + entry->fd_entry = _bfinfdpic_get_fd_entry (&dinfo->gothilo); + + return 1; +} + +/* Assign GOT offsets to private function descriptors used by PLT + entries (or referenced by 32-bit offsets), as well as PLT entries + and lazy PLT entries. */ + +static int +_bfinfdpic_assign_plt_entries (void **entryp, void *info_) +{ + struct bfinfdpic_relocs_info *entry = *entryp; + struct _bfinfdpic_dynamic_got_plt_info *dinfo = info_; + + /* If this symbol requires a local function descriptor, allocate + one. */ + if (entry->privfd && entry->fd_entry == 0) + { + if (dinfo->got17m4.fdplt) + { + entry->fd_entry = _bfinfdpic_get_fd_entry (&dinfo->got17m4); + dinfo->got17m4.fdplt -= 8; + } + else + { + BFD_ASSERT (dinfo->gothilo.fdplt); + entry->fd_entry = _bfinfdpic_get_fd_entry (&dinfo->gothilo); + dinfo->gothilo.fdplt -= 8; + } + } + + if (entry->plt) + { + int size; + + /* We use the section's raw size to mark the location of the + next PLT entry. */ + entry->plt_entry = bfinfdpic_plt_section (dinfo->g.info)->size; + + /* Figure out the length of this PLT entry based on the + addressing mode we need to reach the function descriptor. */ + BFD_ASSERT (entry->fd_entry); + if (entry->fd_entry >= -(1 << (18 - 1)) + && entry->fd_entry + 4 < (1 << (18 - 1))) + size = 10; + else + size = 16; + + bfinfdpic_plt_section (dinfo->g.info)->size += size; + } + + if (entry->lazyplt) + { + entry->lzplt_entry = dinfo->g.lzplt; + dinfo->g.lzplt += LZPLT_NORMAL_SIZE; + /* If this entry is the one that gets the resolver stub, account + for the additional instruction. */ + if (entry->lzplt_entry % BFINFDPIC_LZPLT_BLOCK_SIZE + == BFINFDPIC_LZPLT_RESOLV_LOC) + dinfo->g.lzplt += LZPLT_RESOLVER_EXTRA; + } + + return 1; +} + +/* Follow indirect and warning hash entries so that each got entry + points to the final symbol definition. P must point to a pointer + to the hash table we're traversing. Since this traversal may + modify the hash table, we set this pointer to NULL to indicate + we've made a potentially-destructive change to the hash table, so + the traversal must be restarted. */ +static int +_bfinfdpic_resolve_final_relocs_info (void **entryp, void *p) +{ + struct bfinfdpic_relocs_info *entry = *entryp; + htab_t *htab = p; + + if (entry->symndx == -1) + { + struct elf_link_hash_entry *h = entry->d.h; + struct bfinfdpic_relocs_info *oentry; + + 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 (entry->d.h == h) + return 1; + + oentry = bfinfdpic_relocs_info_for_global (*htab, 0, h, entry->addend, + NO_INSERT); + + if (oentry) + { + /* Merge the two entries. */ + bfinfdpic_pic_merge_early_relocs_info (oentry, entry); + htab_clear_slot (*htab, entryp); + return 1; + } + + entry->d.h = h; + + /* If we can't find this entry with the new bfd hash, re-insert + it, and get the traversal restarted. */ + if (! htab_find (*htab, entry)) + { + htab_clear_slot (*htab, entryp); + entryp = htab_find_slot (*htab, entry, INSERT); + if (! *entryp) + *entryp = entry; + /* Abort the traversal, since the whole table may have + moved, and leave it up to the parent to restart the + process. */ + *(htab_t *)p = NULL; + return 0; + } + } + + return 1; +} + +/* Set the sizes of the dynamic sections. */ + +static bfd_boolean +elf32_bfinfdpic_size_dynamic_sections (bfd *output_bfd, + struct bfd_link_info *info) +{ + bfd *dynobj; + asection *s; + struct _bfinfdpic_dynamic_got_plt_info gpinfo; + bfd_signed_vma odd; + bfd_vma limit; + + dynobj = elf_hash_table (info)->dynobj; + BFD_ASSERT (dynobj != NULL); + + if (elf_hash_table (info)->dynamic_sections_created) + { + /* Set the contents of the .interp section to the interpreter. */ + if (info->executable) + { + s = bfd_get_section_by_name (dynobj, ".interp"); + BFD_ASSERT (s != NULL); + s->size = sizeof ELF_DYNAMIC_INTERPRETER; + s->contents = (bfd_byte *) ELF_DYNAMIC_INTERPRETER; + } + } + + memset (&gpinfo, 0, sizeof (gpinfo)); + gpinfo.g.info = info; + + for (;;) + { + htab_t relocs = bfinfdpic_relocs_info (info); + + htab_traverse (relocs, _bfinfdpic_resolve_final_relocs_info, &relocs); + + if (relocs == bfinfdpic_relocs_info (info)) + break; + } + + htab_traverse (bfinfdpic_relocs_info (info), _bfinfdpic_count_got_plt_entries, + &gpinfo.g); + + odd = 12; + /* Compute the total size taken by entries in the 18-bit range, + to tell how many PLT function descriptors we can bring into it + without causing it to overflow. */ + limit = odd + gpinfo.g.got17m4 + gpinfo.g.fd17m4; + if (limit < (bfd_vma)1 << 18) + limit = ((bfd_vma)1 << 18) - limit; + else + limit = 0; + if (gpinfo.g.fdplt < limit) + limit = gpinfo.g.fdplt; + + /* Determine the ranges of GOT offsets that we can use for each + range of addressing modes. */ + odd = _bfinfdpic_compute_got_alloc_data (&gpinfo.got17m4, + 0, + odd, + 16, + gpinfo.g.got17m4, + gpinfo.g.fd17m4, + limit, + (bfd_vma)1 << (18-1)); + odd = _bfinfdpic_compute_got_alloc_data (&gpinfo.gothilo, + gpinfo.got17m4.min, + odd, + gpinfo.got17m4.max, + gpinfo.g.gothilo, + gpinfo.g.fdhilo, + gpinfo.g.fdplt - gpinfo.got17m4.fdplt, + (bfd_vma)1 << (32-1)); + + /* Now assign (most) GOT offsets. */ + htab_traverse (bfinfdpic_relocs_info (info), _bfinfdpic_assign_got_entries, + &gpinfo); + + bfinfdpic_got_section (info)->size = gpinfo.gothilo.max + - gpinfo.gothilo.min + /* If an odd word is the last word of the GOT, we don't need this + word to be part of the GOT. */ + - (odd + 4 == gpinfo.gothilo.max ? 4 : 0); + if (bfinfdpic_got_section (info)->size == 0) + bfinfdpic_got_section (info)->flags |= SEC_EXCLUDE; + else if (bfinfdpic_got_section (info)->size == 12 + && ! elf_hash_table (info)->dynamic_sections_created) + { + bfinfdpic_got_section (info)->flags |= SEC_EXCLUDE; + bfinfdpic_got_section (info)->size = 0; + } + else + { + bfinfdpic_got_section (info)->contents = + (bfd_byte *) bfd_zalloc (dynobj, + bfinfdpic_got_section (info)->size); + if (bfinfdpic_got_section (info)->contents == NULL) + return FALSE; + } + + if (elf_hash_table (info)->dynamic_sections_created) + /* Subtract the number of lzplt entries, since those will generate + relocations in the pltrel section. */ + bfinfdpic_gotrel_section (info)->size = + (gpinfo.g.relocs - gpinfo.g.lzplt / LZPLT_NORMAL_SIZE) + * get_elf_backend_data (output_bfd)->s->sizeof_rel; + else + BFD_ASSERT (gpinfo.g.relocs == 0); + if (bfinfdpic_gotrel_section (info)->size == 0) + bfinfdpic_gotrel_section (info)->flags |= SEC_EXCLUDE; + else + { + bfinfdpic_gotrel_section (info)->contents = + (bfd_byte *) bfd_zalloc (dynobj, + bfinfdpic_gotrel_section (info)->size); + if (bfinfdpic_gotrel_section (info)->contents == NULL) + return FALSE; + } + + bfinfdpic_gotfixup_section (info)->size = (gpinfo.g.fixups + 1) * 4; + if (bfinfdpic_gotfixup_section (info)->size == 0) + bfinfdpic_gotfixup_section (info)->flags |= SEC_EXCLUDE; + else + { + bfinfdpic_gotfixup_section (info)->contents = + (bfd_byte *) bfd_zalloc (dynobj, + bfinfdpic_gotfixup_section (info)->size); + if (bfinfdpic_gotfixup_section (info)->contents == NULL) + return FALSE; + } + + if (elf_hash_table (info)->dynamic_sections_created) + { + bfinfdpic_pltrel_section (info)->size = + gpinfo.g.lzplt / LZPLT_NORMAL_SIZE * get_elf_backend_data (output_bfd)->s->sizeof_rel; + if (bfinfdpic_pltrel_section (info)->size == 0) + bfinfdpic_pltrel_section (info)->flags |= SEC_EXCLUDE; + else + { + bfinfdpic_pltrel_section (info)->contents = + (bfd_byte *) bfd_zalloc (dynobj, + bfinfdpic_pltrel_section (info)->size); + if (bfinfdpic_pltrel_section (info)->contents == NULL) + return FALSE; + } + } + + /* Add 4 bytes for every block of at most 65535 lazy PLT entries, + such that there's room for the additional instruction needed to + call the resolver. Since _bfinfdpic_assign_got_entries didn't + account for them, our block size is 4 bytes smaller than the real + block size. */ + if (elf_hash_table (info)->dynamic_sections_created) + { + bfinfdpic_plt_section (info)->size = gpinfo.g.lzplt + + ((gpinfo.g.lzplt + (BFINFDPIC_LZPLT_BLOCK_SIZE - 4) - LZPLT_NORMAL_SIZE) + / (BFINFDPIC_LZPLT_BLOCK_SIZE - 4) * LZPLT_RESOLVER_EXTRA); + } + + /* Reset it, such that _bfinfdpic_assign_plt_entries() can use it to + actually assign lazy PLT entries addresses. */ + gpinfo.g.lzplt = 0; + + /* Save information that we're going to need to generate GOT and PLT + entries. */ + bfinfdpic_got_initial_offset (info) = -gpinfo.gothilo.min; + + if (get_elf_backend_data (output_bfd)->want_got_sym) + elf_hash_table (info)->hgot->root.u.def.value + += bfinfdpic_got_initial_offset (info); + + if (elf_hash_table (info)->dynamic_sections_created) + bfinfdpic_plt_initial_offset (info) = + bfinfdpic_plt_section (info)->size; + + htab_traverse (bfinfdpic_relocs_info (info), _bfinfdpic_assign_plt_entries, + &gpinfo); + + /* Allocate the PLT section contents only after + _bfinfdpic_assign_plt_entries has a chance to add the size of the + non-lazy PLT entries. */ + if (elf_hash_table (info)->dynamic_sections_created) + { + if (bfinfdpic_plt_section (info)->size == 0) + bfinfdpic_plt_section (info)->flags |= SEC_EXCLUDE; + else + { + bfinfdpic_plt_section (info)->contents = + (bfd_byte *) bfd_zalloc (dynobj, + bfinfdpic_plt_section (info)->size); + if (bfinfdpic_plt_section (info)->contents == NULL) + return FALSE; + } + } + + if (elf_hash_table (info)->dynamic_sections_created) + { + if (bfinfdpic_got_section (info)->size) + if (!_bfd_elf_add_dynamic_entry (info, DT_PLTGOT, 0)) + return FALSE; + + if (bfinfdpic_pltrel_section (info)->size) + if (!_bfd_elf_add_dynamic_entry (info, DT_PLTRELSZ, 0) + || !_bfd_elf_add_dynamic_entry (info, DT_PLTREL, DT_REL) + || !_bfd_elf_add_dynamic_entry (info, DT_JMPREL, 0)) + return FALSE; + + if (bfinfdpic_gotrel_section (info)->size) + if (!_bfd_elf_add_dynamic_entry (info, DT_REL, 0) + || !_bfd_elf_add_dynamic_entry (info, DT_RELSZ, 0) + || !_bfd_elf_add_dynamic_entry (info, DT_RELENT, + sizeof (Elf32_External_Rel))) + return FALSE; + } + + return TRUE; +} + +static bfd_boolean +elf32_bfinfdpic_always_size_sections (bfd *output_bfd, + struct bfd_link_info *info) +{ + if (!info->relocatable) + { + struct elf_link_hash_entry *h; + asection *sec; + + /* Force a PT_GNU_STACK segment to be created. */ + if (! elf_tdata (output_bfd)->stack_flags) + elf_tdata (output_bfd)->stack_flags = PF_R | PF_W | PF_X; + + /* Define __stacksize if it's not defined yet. */ + h = elf_link_hash_lookup (elf_hash_table (info), "__stacksize", + FALSE, FALSE, FALSE); + if (! h || h->root.type != bfd_link_hash_defined + || h->type != STT_OBJECT + || !h->def_regular) + { + struct bfd_link_hash_entry *bh = NULL; + + if (!(_bfd_generic_link_add_one_symbol + (info, output_bfd, "__stacksize", + BSF_GLOBAL, bfd_abs_section_ptr, DEFAULT_STACK_SIZE, + (const char *) NULL, FALSE, + get_elf_backend_data (output_bfd)->collect, &bh))) + return FALSE; + + h = (struct elf_link_hash_entry *) bh; + h->def_regular = 1; + h->type = STT_OBJECT; + } + + /* Create a stack section, and set its alignment. */ + sec = bfd_make_section (output_bfd, ".stack"); + + if (sec == NULL + || ! bfd_set_section_alignment (output_bfd, sec, 3)) + return FALSE; + } + + return TRUE; +} + +static bfd_boolean +elf32_bfinfdpic_modify_segment_map (bfd *output_bfd, + struct bfd_link_info *info) +{ + struct elf_segment_map *m; + + /* objcopy and strip preserve what's already there using + elf32_bfinfdpic_copy_private_bfd_data (). */ + if (! info) return TRUE; - in_flags = elf_elfheader (ibfd)->e_flags; - out_flags = elf_elfheader (obfd)->e_flags; + for (m = elf_tdata (output_bfd)->segment_map; m != NULL; m = m->next) + if (m->p_type == PT_GNU_STACK) + break; - if (!elf_flags_init (obfd)) + if (m) { - elf_flags_init (obfd) = TRUE; - elf_elfheader (obfd)->e_flags = in_flags; + asection *sec = bfd_get_section_by_name (output_bfd, ".stack"); + struct elf_link_hash_entry *h; + + if (sec) + { + /* Obtain the pointer to the __stacksize symbol. */ + h = elf_link_hash_lookup (elf_hash_table (info), "__stacksize", + FALSE, FALSE, 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; + BFD_ASSERT (h->root.type == bfd_link_hash_defined); + + /* Set the section size from the symbol value. We + intentionally ignore the symbol section. */ + if (h->root.type == bfd_link_hash_defined) + sec->size = h->root.u.def.value; + else + sec->size = DEFAULT_STACK_SIZE; + + /* Add the stack section to the PT_GNU_STACK segment, + such that its size and alignment requirements make it + to the segment. */ + m->sections[m->count] = sec; + m->count++; + } } return TRUE; } +static bfd_boolean +elf32_bfinfdpic_finish_dynamic_sections (bfd *output_bfd, + struct bfd_link_info *info) +{ + bfd *dynobj; + asection *sdyn; + + dynobj = elf_hash_table (info)->dynobj; + + if (bfinfdpic_got_section (info)) + { + BFD_ASSERT (bfinfdpic_gotrel_section (info)->size + == (bfinfdpic_gotrel_section (info)->reloc_count + * sizeof (Elf32_External_Rel))); + + if (bfinfdpic_gotfixup_section (info)) + { + struct elf_link_hash_entry *hgot = elf_hash_table (info)->hgot; + bfd_vma got_value = hgot->root.u.def.value + + hgot->root.u.def.section->output_section->vma + + hgot->root.u.def.section->output_offset; + + _bfinfdpic_add_rofixup (output_bfd, bfinfdpic_gotfixup_section (info), + got_value, 0); + + if (bfinfdpic_gotfixup_section (info)->size + != (bfinfdpic_gotfixup_section (info)->reloc_count * 4)) + { + (*_bfd_error_handler) + ("LINKER BUG: .rofixup section size mismatch"); + return FALSE; + } + } + } + if (elf_hash_table (info)->dynamic_sections_created) + { + BFD_ASSERT (bfinfdpic_pltrel_section (info)->size + == (bfinfdpic_pltrel_section (info)->reloc_count + * sizeof (Elf32_External_Rel))); + } + + sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); + + if (elf_hash_table (info)->dynamic_sections_created) + { + Elf32_External_Dyn * dyncon; + Elf32_External_Dyn * dynconend; + + BFD_ASSERT (sdyn != NULL); + + dyncon = (Elf32_External_Dyn *) sdyn->contents; + dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size); + + for (; dyncon < dynconend; dyncon++) + { + Elf_Internal_Dyn dyn; + + bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); + + switch (dyn.d_tag) + { + default: + break; + + case DT_PLTGOT: + dyn.d_un.d_ptr = bfinfdpic_got_section (info)->output_section->vma + + bfinfdpic_got_section (info)->output_offset + + bfinfdpic_got_initial_offset (info); + bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); + break; + + case DT_JMPREL: + dyn.d_un.d_ptr = bfinfdpic_pltrel_section (info) + ->output_section->vma + + bfinfdpic_pltrel_section (info)->output_offset; + bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); + break; + + case DT_PLTRELSZ: + dyn.d_un.d_val = bfinfdpic_pltrel_section (info)->size; + bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); + break; + } + } + } + + return TRUE; +} + +/* Adjust a symbol defined by a dynamic object and referenced by a + regular object. */ + +static bfd_boolean +elf32_bfinfdpic_adjust_dynamic_symbol +(struct bfd_link_info *info ATTRIBUTE_UNUSED, + struct elf_link_hash_entry *h ATTRIBUTE_UNUSED) +{ + bfd * dynobj; + + dynobj = elf_hash_table (info)->dynobj; + + /* Make sure we know what is going on here. */ + BFD_ASSERT (dynobj != NULL + && (h->u.weakdef != NULL + || (h->def_dynamic + && h->ref_regular + && !h->def_regular))); + + /* 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->u.weakdef != NULL) + { + BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined + || h->u.weakdef->root.type == bfd_link_hash_defweak); + h->root.u.def.section = h->u.weakdef->root.u.def.section; + h->root.u.def.value = h->u.weakdef->root.u.def.value; + } + + return TRUE; +} + +/* Perform any actions needed for dynamic symbols. */ + +static bfd_boolean +elf32_bfinfdpic_finish_dynamic_symbol +(bfd *output_bfd ATTRIBUTE_UNUSED, + struct bfd_link_info *info ATTRIBUTE_UNUSED, + struct elf_link_hash_entry *h ATTRIBUTE_UNUSED, + Elf_Internal_Sym *sym ATTRIBUTE_UNUSED) +{ + return TRUE; +} + +/* Decide whether to attempt to turn absptr or lsda encodings in + shared libraries into pcrel within the given input section. */ + +static bfd_boolean +bfinfdpic_elf_use_relative_eh_frame +(bfd *input_bfd ATTRIBUTE_UNUSED, + struct bfd_link_info *info ATTRIBUTE_UNUSED, + asection *eh_frame_section ATTRIBUTE_UNUSED) +{ + /* We can't use PC-relative encodings in FDPIC binaries, in general. */ + return FALSE; +} + +/* Adjust the contents of an eh_frame_hdr section before they're output. */ + +static bfd_byte +bfinfdpic_elf_encode_eh_address (bfd *abfd, + struct bfd_link_info *info, + asection *osec, bfd_vma offset, + asection *loc_sec, bfd_vma loc_offset, + bfd_vma *encoded) +{ + struct elf_link_hash_entry *h; + + h = elf_hash_table (info)->hgot; + BFD_ASSERT (h && h->root.type == bfd_link_hash_defined); + + if (! h || (_bfinfdpic_osec_to_segment (abfd, osec) + == _bfinfdpic_osec_to_segment (abfd, loc_sec->output_section))) + return _bfd_elf_encode_eh_address (abfd, info, osec, offset, + loc_sec, loc_offset, encoded); + + BFD_ASSERT (_bfinfdpic_osec_to_segment (abfd, osec) + == (_bfinfdpic_osec_to_segment + (abfd, h->root.u.def.section->output_section))); + + *encoded = osec->vma + offset + - (h->root.u.def.value + + h->root.u.def.section->output_section->vma + + h->root.u.def.section->output_offset); + + return DW_EH_PE_datarel | DW_EH_PE_sdata4; +} + + + +/* Look through the relocs for a section during the first phase. + + Besides handling virtual table relocs for gc, we have to deal with + all sorts of PIC-related relocations. We describe below the + general plan on how to handle such relocations, even though we only + collect information at this point, storing them in hash tables for + perusal of later passes. + + 32 relocations are propagated to the linker output when creating + position-independent output. LO16 and HI16 relocations are not + supposed to be encountered in this case. + + LABEL16 should always be resolvable by the linker, since it's only + used by branches. + + LABEL24, on the other hand, is used by calls. If it turns out that + the target of a call is a dynamic symbol, a PLT entry must be + created for it, which triggers the creation of a private function + descriptor and, unless lazy binding is disabled, a lazy PLT entry. + + GPREL relocations require the referenced symbol to be in the same + segment as _gp, but this can only be checked later. + + All GOT, GOTOFF and FUNCDESC relocations require a .got section to + exist. LABEL24 might as well, since it may require a PLT entry, + that will require a got. + + Non-FUNCDESC GOT relocations require a GOT entry to be created + regardless of whether the symbol is dynamic. However, since a + global symbol that turns out to not be exported may have the same + address of a non-dynamic symbol, we don't assign GOT entries at + this point, such that we can share them in this case. A relocation + for the GOT entry always has to be created, be it to offset a + private symbol by the section load address, be it to get the symbol + resolved dynamically. + + FUNCDESC GOT relocations require a GOT entry to be created, and + handled as if a FUNCDESC relocation was applied to the GOT entry in + an object file. + + FUNCDESC relocations referencing a symbol that turns out to NOT be + dynamic cause a private function descriptor to be created. The + FUNCDESC relocation then decays to a 32 relocation that points at + the private descriptor. If the symbol is dynamic, the FUNCDESC + relocation is propagated to the linker output, such that the + dynamic linker creates the canonical descriptor, pointing to the + dynamically-resolved definition of the function. + + Non-FUNCDESC GOTOFF relocations must always refer to non-dynamic + symbols that are assigned to the same segment as the GOT, but we + can only check this later, after we know the complete set of + symbols defined and/or exported. + + FUNCDESC GOTOFF relocations require a function descriptor to be + created and, unless lazy binding is disabled or the symbol is not + dynamic, a lazy PLT entry. Since we can't tell at this point + whether a symbol is going to be dynamic, we have to decide later + whether to create a lazy PLT entry or bind the descriptor directly + to the private function. + + FUNCDESC_VALUE relocations are not supposed to be present in object + files, but they may very well be simply propagated to the linker + output, since they have no side effect. + + + A function descriptor always requires a FUNCDESC_VALUE relocation. + Whether it's in .plt.rel or not depends on whether lazy binding is + enabled and on whether the referenced symbol is dynamic. + + The existence of a lazy PLT requires the resolverStub lazy PLT + entry to be present. + + + As for assignment of GOT, PLT and lazy PLT entries, and private + descriptors, we might do them all sequentially, but we can do + better than that. For example, we can place GOT entries and + private function descriptors referenced using 12-bit operands + closer to the PIC register value, such that these relocations don't + overflow. Those that are only referenced with LO16 relocations + could come next, but we may as well place PLT-required function + descriptors in the 12-bit range to make them shorter. Symbols + referenced with LO16/HI16 may come next, but we may place + additional function descriptors in the 16-bit range if we can + reliably tell that we've already placed entries that are ever + referenced with only LO16. PLT entries are therefore generated as + small as possible, while not introducing relocation overflows in + GOT or FUNCDESC_GOTOFF relocations. Lazy PLT entries could be + generated before or after PLT entries, but not intermingled with + them, such that we can have more lazy PLT entries in range for a + branch to the resolverStub. The resolverStub should be emitted at + the most distant location from the first lazy PLT entry such that + it's still in range for a branch, or closer, if there isn't a need + for so many lazy PLT entries. Additional lazy PLT entries may be + emitted after the resolverStub, as long as branches are still in + range. If the branch goes out of range, longer lazy PLT entries + are emitted. + + We could further optimize PLT and lazy PLT entries by giving them + priority in assignment to closer-to-gr17 locations depending on the + number of occurrences of references to them (assuming a function + that's called more often is more important for performance, so its + PLT entry should be faster), or taking hints from the compiler. + Given infinite time and money... :-) */ + +static bfd_boolean +bfinfdpic_check_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, **sym_hashes_end; + const Elf_Internal_Rela *rel; + const Elf_Internal_Rela *rel_end; + bfd *dynobj; + struct bfinfdpic_relocs_info *picrel; + + if (info->relocatable) + return TRUE; + + symtab_hdr = &elf_tdata (abfd)->symtab_hdr; + sym_hashes = elf_sym_hashes (abfd); + sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof(Elf32_External_Sym); + if (!elf_bad_symtab (abfd)) + sym_hashes_end -= symtab_hdr->sh_info; + + dynobj = elf_hash_table (info)->dynobj; + rel_end = relocs + sec->reloc_count; + for (rel = relocs; rel < rel_end; rel++) + { + struct elf_link_hash_entry *h; + unsigned long r_symndx; + + 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]; + + switch (ELF32_R_TYPE (rel->r_info)) + { + case R_BFIN_GOT17M4: + case R_BFIN_GOTHI: + case R_BFIN_GOTLO: + case R_BFIN_FUNCDESC_GOT17M4: + case R_BFIN_FUNCDESC_GOTHI: + case R_BFIN_FUNCDESC_GOTLO: + case R_BFIN_GOTOFF17M4: + case R_BFIN_GOTOFFHI: + case R_BFIN_GOTOFFLO: + case R_BFIN_FUNCDESC_GOTOFF17M4: + case R_BFIN_FUNCDESC_GOTOFFHI: + case R_BFIN_FUNCDESC_GOTOFFLO: + case R_BFIN_FUNCDESC: + case R_BFIN_FUNCDESC_VALUE: + if (! IS_FDPIC (abfd)) + goto bad_reloc; + /* Fall through. */ + case R_pcrel24: + case R_pcrel24_jump_l: + case R_byte4_data: + if (IS_FDPIC (abfd) && ! dynobj) + { + elf_hash_table (info)->dynobj = dynobj = abfd; + if (! _bfin_create_got_section (abfd, info)) + return FALSE; + } + if (! IS_FDPIC (abfd)) + { + picrel = NULL; + break; + } + if (h != NULL) + { + if (h->dynindx == -1) + switch (ELF_ST_VISIBILITY (h->other)) + { + case STV_INTERNAL: + case STV_HIDDEN: + break; + default: + bfd_elf_link_record_dynamic_symbol (info, h); + break; + } + picrel + = bfinfdpic_relocs_info_for_global (bfinfdpic_relocs_info (info), + abfd, h, + rel->r_addend, INSERT); + } + else + picrel = bfinfdpic_relocs_info_for_local (bfinfdpic_relocs_info + (info), abfd, r_symndx, + rel->r_addend, INSERT); + if (! picrel) + return FALSE; + break; + + default: + picrel = NULL; + break; + } + + switch (ELF32_R_TYPE (rel->r_info)) + { + case R_pcrel24: + case R_pcrel24_jump_l: + if (IS_FDPIC (abfd)) + picrel->call = 1; + break; + + case R_BFIN_FUNCDESC_VALUE: + picrel->relocsfdv++; + if (bfd_get_section_flags (abfd, sec) & SEC_ALLOC) + picrel->relocs32--; + /* Fall through. */ + + case R_byte4_data: + if (! IS_FDPIC (abfd)) + break; + + picrel->sym = 1; + if (bfd_get_section_flags (abfd, sec) & SEC_ALLOC) + picrel->relocs32++; + break; + + case R_BFIN_GOT17M4: + picrel->got17m4 = 1; + break; + + case R_BFIN_GOTHI: + case R_BFIN_GOTLO: + picrel->gothilo = 1; + break; + + case R_BFIN_FUNCDESC_GOT17M4: + picrel->fdgot17m4 = 1; + break; + + case R_BFIN_FUNCDESC_GOTHI: + case R_BFIN_FUNCDESC_GOTLO: + picrel->fdgothilo = 1; + break; + + case R_BFIN_GOTOFF17M4: + case R_BFIN_GOTOFFHI: + case R_BFIN_GOTOFFLO: + picrel->gotoff = 1; + break; + + case R_BFIN_FUNCDESC_GOTOFF17M4: + picrel->fdgoff17m4 = 1; + break; + + case R_BFIN_FUNCDESC_GOTOFFHI: + case R_BFIN_FUNCDESC_GOTOFFLO: + picrel->fdgoffhilo = 1; + break; + + case R_BFIN_FUNCDESC: + picrel->fd = 1; + picrel->relocsfd++; + break; + + /* This relocation describes the C++ object vtable hierarchy. + Reconstruct it for later use during GC. */ + case R_BFIN_GNU_VTINHERIT: + if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) + return FALSE; + break; + + /* This relocation describes which C++ vtable entries are actually + used. Record for later use during GC. */ + case R_BFIN_GNU_VTENTRY: + if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) + return FALSE; + break; + + case R_huimm16: + case R_luimm16: + case R_pcrel12_jump_s: + case R_pcrel10: + break; + + default: + bad_reloc: + (*_bfd_error_handler) + (_("%B: unsupported relocation type %i"), + abfd, ELF32_R_TYPE (rel->r_info)); + return FALSE; + } + } + + return TRUE; +} + +/* Set the right machine number for a Blackfin ELF file. */ + +static bfd_boolean +elf32_bfin_object_p (bfd *abfd) +{ + bfd_default_set_arch_mach (abfd, bfd_arch_bfin, 0); + return (((elf_elfheader (abfd)->e_flags & EF_BFIN_FDPIC) != 0) + == (IS_FDPIC (abfd))); +} static bfd_boolean elf32_bfin_set_private_flags (bfd * abfd, flagword flags) @@ -1471,29 +4746,170 @@ elf32_bfin_set_private_flags (bfd * abfd, flagword flags) return TRUE; } +/* Copy backend specific data from one object module to another. */ + +static bfd_boolean +bfin_elf_copy_private_bfd_data (bfd *ibfd, bfd *obfd) +{ + if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour + || bfd_get_flavour (obfd) != bfd_target_elf_flavour) + return TRUE; + + BFD_ASSERT (!elf_flags_init (obfd) + || elf_elfheader (obfd)->e_flags == elf_elfheader (ibfd)->e_flags); + + elf_elfheader (obfd)->e_flags = elf_elfheader (ibfd)->e_flags; + elf_flags_init (obfd) = TRUE; + return TRUE; +} + +static bfd_boolean +elf32_bfinfdpic_copy_private_bfd_data (bfd *ibfd, bfd *obfd) +{ + unsigned i; + + if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour + || bfd_get_flavour (obfd) != bfd_target_elf_flavour) + return TRUE; + + if (! bfin_elf_copy_private_bfd_data (ibfd, obfd)) + return FALSE; + + if (! elf_tdata (ibfd) || ! elf_tdata (ibfd)->phdr + || ! elf_tdata (obfd) || ! elf_tdata (obfd)->phdr) + return TRUE; + + /* Copy the stack size. */ + for (i = 0; i < elf_elfheader (ibfd)->e_phnum; i++) + if (elf_tdata (ibfd)->phdr[i].p_type == PT_GNU_STACK) + { + Elf_Internal_Phdr *iphdr = &elf_tdata (ibfd)->phdr[i]; + + for (i = 0; i < elf_elfheader (obfd)->e_phnum; i++) + if (elf_tdata (obfd)->phdr[i].p_type == PT_GNU_STACK) + { + memcpy (&elf_tdata (obfd)->phdr[i], iphdr, sizeof (*iphdr)); + + /* Rewrite the phdrs, since we're only called after they + were first written. */ + if (bfd_seek (obfd, (bfd_signed_vma) get_elf_backend_data (obfd) + ->s->sizeof_ehdr, SEEK_SET) != 0 + || get_elf_backend_data (obfd)->s + ->write_out_phdrs (obfd, elf_tdata (obfd)->phdr, + elf_elfheader (obfd)->e_phnum) != 0) + return FALSE; + break; + } + + break; + } + + return TRUE; +} + /* Display the flags field. */ static bfd_boolean elf32_bfin_print_private_bfd_data (bfd * abfd, PTR ptr) { FILE *file = (FILE *) ptr; + flagword flags; BFD_ASSERT (abfd != NULL && ptr != NULL); /* Print normal ELF private data. */ _bfd_elf_print_private_bfd_data (abfd, ptr); - /* Ignore init flag - it may not be set, despite the flags field - containing valid data. */ + flags = elf_elfheader (abfd)->e_flags; /* xgettext:c-format */ fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags); + if (flags & EF_BFIN_PIC) + fprintf (file, " -fpic"); + + if (flags & EF_BFIN_FDPIC) + fprintf (file, " -mfdpic"); + fputc ('\n', file); return TRUE; } +/* Merge backend specific data from an object file to the output + object file when linking. */ + +static bfd_boolean +elf32_bfin_merge_private_bfd_data (bfd *ibfd, bfd *obfd) +{ + flagword old_flags, old_partial; + flagword new_flags, new_partial; + bfd_boolean error = FALSE; + + new_flags = elf_elfheader (ibfd)->e_flags; + old_flags = elf_elfheader (obfd)->e_flags; + + if (new_flags & EF_BFIN_FDPIC) + new_flags &= ~EF_BFIN_PIC; + +#ifdef DEBUG + (*_bfd_error_handler) ("old_flags = 0x%.8lx, new_flags = 0x%.8lx, init = %s, filename = %s", + old_flags, new_flags, elf_flags_init (obfd) ? "yes" : "no", + bfd_get_filename (ibfd)); +#endif + + if (!elf_flags_init (obfd)) /* First call, no flags set. */ + { + elf_flags_init (obfd) = TRUE; + old_flags = new_flags; + } + + else if (new_flags == old_flags) /* Compatible flags are ok. */ + ; + + else /* Possibly incompatible flags. */ + { + /* We don't have to do anything if the pic flags are the same, or the new + module(s) were compiled with -mlibrary-pic. */ + new_partial = (new_flags & EF_BFIN_PIC_FLAGS); + old_partial = (old_flags & EF_BFIN_PIC_FLAGS); + if (new_partial == old_partial) + ; + + /* If we have mixtures of -fpic and -fPIC, or in both bits. */ + else if (new_partial != 0 && old_partial != 0) + old_flags |= new_partial; + + /* One module was compiled for pic and the other was not, see if we have + had any relocations that are not pic-safe. */ + else + old_flags |= new_partial; + + } + + /* Update the old flags now with changes made above. */ + elf_elfheader (obfd)->e_flags = old_flags; + + if (((new_flags & EF_BFIN_FDPIC) == 0) + != (! IS_FDPIC (ibfd))) + { + error = TRUE; + if (IS_FDPIC (obfd)) + (*_bfd_error_handler) + (_("%s: cannot link non-fdpic object file into fdpic executable"), + bfd_get_filename (ibfd)); + else + (*_bfd_error_handler) + (_("%s: cannot link fdpic object file into non-fdpic executable"), + bfd_get_filename (ibfd)); + } + + if (error) + bfd_set_error (bfd_error_bad_value); + + return !error; +} + /* bfin ELF linker hash entry. */ struct bfin_link_hash_entry @@ -1518,7 +4934,7 @@ struct bfin_link_hash_table static struct bfd_hash_entry * bfin_link_hash_newfunc (struct bfd_hash_entry *entry, - struct bfd_hash_table *table, const char *string) + struct bfd_hash_table *table, const char *string) { struct bfd_hash_entry *ret = entry; @@ -1545,13 +4961,13 @@ bfin_link_hash_table_create (bfd * abfd) struct bfin_link_hash_table *ret; bfd_size_type amt = sizeof (struct bfin_link_hash_table); - ret = (struct bfin_link_hash_table *) bfd_malloc (amt); - if (ret == (struct bfin_link_hash_table *) NULL) + ret = bfd_zalloc (abfd, amt); + if (ret == NULL) return NULL; if (!_bfd_elf_link_hash_table_init (&ret->root, abfd, bfin_link_hash_newfunc, - sizeof (struct bfin_link_hash_entry))) + sizeof (struct elf_link_hash_entry))) { free (ret); return NULL; @@ -1838,9 +5254,6 @@ bfin_discard_copies (struct elf_link_hash_entry *h, PTR inf) return TRUE; } -/* Set the sizes of the dynamic sections. */ -#define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1" - static bfd_boolean bfin_size_dynamic_sections (bfd * output_bfd ATTRIBUTE_UNUSED, struct bfd_link_info *info) @@ -1986,7 +5399,7 @@ bfin_size_dynamic_sections (bfd * output_bfd ATTRIBUTE_UNUSED, return TRUE; } - + /* Given a .data section and a .emreloc in-memory section, store relocation information into the .emreloc section which can be used at runtime to relocate the section. This is called by the @@ -2112,7 +5525,7 @@ error_return: free (internal_relocs); return FALSE; } - + #define TARGET_LITTLE_SYM bfd_elf32_bfin_vec #define TARGET_LITTLE_NAME "elf32-bfin" #define ELF_ARCH bfd_arch_bfin @@ -2123,6 +5536,7 @@ error_return: #define bfd_elf32_bfd_reloc_type_lookup bfin_bfd_reloc_type_lookup #define elf_info_to_howto bfin_info_to_howto #define elf_info_to_howto_rel 0 +#define elf_backend_object_p elf32_bfin_object_p #define bfd_elf32_bfd_is_local_label_name \ bfin_is_local_label_name @@ -2137,7 +5551,7 @@ error_return: bfin_link_hash_table_create #define bfd_elf32_bfd_final_link bfd_elf_gc_common_final_link -#define elf_backend_check_relocs bfin_check_relocs +#define elf_backend_check_relocs bfin_check_relocs #define elf_backend_adjust_dynamic_symbol \ bfin_adjust_dynamic_symbol #define elf_backend_size_dynamic_sections \ @@ -2164,5 +5578,74 @@ error_return: #define elf_backend_got_header_size 12 #define elf_backend_rela_normal 1 +#include "elf32-target.h" + +#undef TARGET_LITTLE_SYM +#define TARGET_LITTLE_SYM bfd_elf32_bfinfdpic_vec +#undef TARGET_LITTLE_NAME +#define TARGET_LITTLE_NAME "elf32-bfinfdpic" +#undef elf32_bed +#define elf32_bed elf32_bfinfdpic_bed + +#undef elf_backend_gc_sweep_hook +#define elf_backend_gc_sweep_hook bfinfdpic_gc_sweep_hook + +#undef elf_backend_got_header_size +#define elf_backend_got_header_size 0 + +#undef elf_backend_relocate_section +#define elf_backend_relocate_section bfinfdpic_relocate_section +#undef elf_backend_check_relocs +#define elf_backend_check_relocs bfinfdpic_check_relocs + +#undef bfd_elf32_bfd_link_hash_table_create +#define bfd_elf32_bfd_link_hash_table_create \ + bfinfdpic_elf_link_hash_table_create +#undef elf_backend_always_size_sections +#define elf_backend_always_size_sections \ + elf32_bfinfdpic_always_size_sections +#undef elf_backend_modify_segment_map +#define elf_backend_modify_segment_map \ + elf32_bfinfdpic_modify_segment_map +#undef bfd_elf32_bfd_copy_private_bfd_data +#define bfd_elf32_bfd_copy_private_bfd_data \ + elf32_bfinfdpic_copy_private_bfd_data + +#undef elf_backend_create_dynamic_sections +#define elf_backend_create_dynamic_sections \ + elf32_bfinfdpic_create_dynamic_sections +#undef elf_backend_adjust_dynamic_symbol +#define elf_backend_adjust_dynamic_symbol \ + elf32_bfinfdpic_adjust_dynamic_symbol +#undef elf_backend_size_dynamic_sections +#define elf_backend_size_dynamic_sections \ + elf32_bfinfdpic_size_dynamic_sections +#undef elf_backend_finish_dynamic_symbol +#define elf_backend_finish_dynamic_symbol \ + elf32_bfinfdpic_finish_dynamic_symbol +#undef elf_backend_finish_dynamic_sections +#define elf_backend_finish_dynamic_sections \ + elf32_bfinfdpic_finish_dynamic_sections + +#undef elf_backend_can_make_relative_eh_frame +#define elf_backend_can_make_relative_eh_frame \ + bfinfdpic_elf_use_relative_eh_frame +#undef elf_backend_can_make_lsda_relative_eh_frame +#define elf_backend_can_make_lsda_relative_eh_frame \ + bfinfdpic_elf_use_relative_eh_frame +#undef elf_backend_encode_eh_address +#define elf_backend_encode_eh_address \ + bfinfdpic_elf_encode_eh_address + +#undef elf_backend_may_use_rel_p +#define elf_backend_may_use_rel_p 1 +#undef elf_backend_may_use_rela_p +#define elf_backend_may_use_rela_p 1 +/* We use REL for dynamic relocations only. */ +#undef elf_backend_default_use_rela_p +#define elf_backend_default_use_rela_p 1 + +#undef elf_backend_omit_section_dynsym +#define elf_backend_omit_section_dynsym _bfinfdpic_link_omit_section_dynsym #include "elf32-target.h" |