diff options
| -rw-r--r-- | bfd/elf32-mips.c | 989 |
1 files changed, 984 insertions, 5 deletions
diff --git a/bfd/elf32-mips.c b/bfd/elf32-mips.c index aa58a07..c56df38 100644 --- a/bfd/elf32-mips.c +++ b/bfd/elf32-mips.c @@ -1,6 +1,9 @@ -/* Motorola 88k-specific support for 32-bit ELF +/* MIPS-specific support for 32-bit ELF Copyright 1993 Free Software Foundation, Inc. + Most of the information added by Ian Lance Taylor, Cygnus Support, + <ian@cygnus.com>. + This file is part of BFD, the Binary File Descriptor library. This program is free software; you can redistribute it and/or modify @@ -20,17 +23,993 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include "bfd.h" #include "sysdep.h" #include "libbfd.h" +#include "seclet.h" #include "libelf.h" +#include "elf/mips.h" + +static bfd_reloc_status_type mips_elf_hi16_reloc PARAMS ((bfd *abfd, + arelent *reloc, + asymbol *symbol, + PTR data, + asection *section, + bfd *output_bfd)); +static bfd_reloc_status_type mips_elf_lo16_reloc PARAMS ((bfd *abfd, + arelent *reloc, + asymbol *symbol, + PTR data, + asection *section, + bfd *output_bfd)); +static bfd_reloc_status_type mips_elf_gprel16_reloc PARAMS ((bfd *abfd, + arelent *reloc, + asymbol *symbol, + PTR data, + asection *section, + bfd *output_bfd)); + +#define USE_REL 1 /* MIPS uses REL relocations instead of RELA */ + +enum reloc_type +{ + R_MIPS_NONE = 0, + R_MIPS_16, R_MIPS_32, + R_MIPS_REL32, R_MIPS_26, + R_MIPS_HI16, R_MIPS_LO16, + R_MIPS_GPREL16, R_MIPS_LITERAL, + R_MIPS_GOT16, R_MIPS_PC16, + R_MIPS_CALL16, R_MIPS_GPREL32, + R_MIPS_max +}; + +static reloc_howto_type elf_mips_howto_table[] = +{ + /* No relocation. */ + HOWTO (R_MIPS_NONE, /* type */ + 0, /* rightshift */ + 0, /* size (0 = byte, 1 = short, 2 = long) */ + 0, /* bitsize */ + false, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_dont, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_MIPS_NONE", /* name */ + false, /* partial_inplace */ + 0, /* src_mask */ + 0, /* dst_mask */ + false), /* pcrel_offset */ + + /* 16 bit relocation. */ + HOWTO (R_MIPS_16, /* type */ + 0, /* rightshift */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 16, /* bitsize */ + false, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_MIPS_16", /* name */ + true, /* partial_inplace */ + 0xffff, /* src_mask */ + 0xffff, /* dst_mask */ + false), /* pcrel_offset */ + + /* 32 bit relocation. */ + HOWTO (R_MIPS_32, /* 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_MIPS_32", /* name */ + true, /* partial_inplace */ + 0xffffffff, /* src_mask */ + 0xffffffff, /* dst_mask */ + false), /* pcrel_offset */ + + /* 32 bit symbol relative relocation. */ + HOWTO (R_MIPS_REL32, /* 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_MIPS_REL32", /* name */ + true, /* partial_inplace */ + 0xffffffff, /* src_mask */ + 0xffffffff, /* dst_mask */ + false), /* pcrel_offset */ + + /* 26 bit branch address. */ + HOWTO (R_MIPS_26, /* type */ + 2, /* rightshift */ + 2, /* size (0 = byte, 1 = short, 2 = long) */ + 26, /* bitsize */ + false, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_MIPS_26", /* name */ + true, /* partial_inplace */ + 0x3ffffff, /* src_mask */ + 0x3ffffff, /* dst_mask */ + false), /* pcrel_offset */ + + /* High 16 bits of symbol value. */ + HOWTO (R_MIPS_HI16, /* type */ + 0, /* rightshift */ + 2, /* size (0 = byte, 1 = short, 2 = long) */ + 16, /* bitsize */ + false, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_dont, /* complain_on_overflow */ + mips_elf_hi16_reloc, /* special_function */ + "R_MIPS_HI16", /* name */ + true, /* partial_inplace */ + 0xffff, /* src_mask */ + 0xffff, /* dst_mask */ + false), /* pcrel_offset */ + + /* Low 16 bits of symbol value. */ + HOWTO (R_MIPS_LO16, /* type */ + 0, /* rightshift */ + 2, /* size (0 = byte, 1 = short, 2 = long) */ + 16, /* bitsize */ + false, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_dont, /* complain_on_overflow */ + mips_elf_lo16_reloc, /* special_function */ + "R_MIPS_LO16", /* name */ + true, /* partial_inplace */ + 0xffff, /* src_mask */ + 0xffff, /* dst_mask */ + false), /* pcrel_offset */ + + /* GP relative reference. */ + HOWTO (R_MIPS_GPREL16, /* type */ + 0, /* rightshift */ + 2, /* size (0 = byte, 1 = short, 2 = long) */ + 16, /* bitsize */ + false, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_signed, /* complain_on_overflow */ + mips_elf_gprel16_reloc, /* special_function */ + "R_MIPS_GPREL16", /* name */ + true, /* partial_inplace */ + 0xffff, /* src_mask */ + 0xffff, /* dst_mask */ + false), /* pcrel_offset */ + + /* Reference to literal section. */ + HOWTO (R_MIPS_LITERAL, /* type */ + 0, /* rightshift */ + 2, /* size (0 = byte, 1 = short, 2 = long) */ + 16, /* bitsize */ + false, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_signed, /* complain_on_overflow */ + mips_elf_gprel16_reloc, /* special_function */ + "R_MIPS_LITERAL", /* name */ + true, /* partial_inplace */ + 0xffff, /* src_mask */ + 0xffff, /* dst_mask */ + false), /* pcrel_offset */ + + /* Reference to global offset table. */ + /* FIXME: This is not handled correctly. */ + HOWTO (R_MIPS_GOT16, /* type */ + 0, /* rightshift */ + 2, /* 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_MIPS_GOT16", /* name */ + false, /* partial_inplace */ + 0, /* src_mask */ + 0xffff, /* dst_mask */ + false), /* pcrel_offset */ + + /* 16 bit PC relative reference. */ + HOWTO (R_MIPS_PC16, /* type */ + 0, /* rightshift */ + 2, /* size (0 = byte, 1 = short, 2 = long) */ + 16, /* bitsize */ + true, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_signed, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_MIPS_PC16", /* name */ + true, /* partial_inplace */ + 0xffff, /* src_mask */ + 0xffff, /* dst_mask */ + false), /* pcrel_offset */ + + /* 16 bit call through global offset table. */ + /* FIXME: This is not handled correctly. */ + HOWTO (R_MIPS_CALL16, /* type */ + 0, /* rightshift */ + 2, /* 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_MIPS_CALL16", /* name */ + false, /* partial_inplace */ + 0, /* src_mask */ + 0xffff, /* dst_mask */ + false), /* pcrel_offset */ + + /* 32 bit GP relative reference. */ + /* FIXME: This is not handled correctly. */ + HOWTO (R_MIPS_GPREL32, /* 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_MIPS_GPREL32", /* name */ + true, /* partial_inplace */ + 0xffffffff, /* src_mask */ + 0xffffffff, /* dst_mask */ + false) /* pcrel_offset */ +}; + +/* Do a R_MIPS_HI16 relocation. This has to be done in combination + with a R_MIPS_LO16 reloc, because there is a carry from the LO16 to + the HI16. Here we just save the information we need; we do the + actual relocation when we see the LO16. MIPS ELF requires that the + LO16 immediately follow the HI16, so this ought to work. */ + +static bfd_byte *mips_hi16_addr; +static bfd_vma mips_hi16_addend; + +static bfd_reloc_status_type +mips_elf_hi16_reloc (abfd, + reloc_entry, + symbol, + data, + input_section, + output_bfd) + bfd *abfd; + arelent *reloc_entry; + asymbol *symbol; + PTR data; + asection *input_section; + bfd *output_bfd; +{ + bfd_reloc_status_type ret; + bfd_vma relocation; + + /* FIXME: The symbol _gp_disp requires special handling, which we do + not do. */ + if (strcmp (bfd_asymbol_name (symbol), "_gp_disp") == 0) + abort (); + + /* If we're relocating, and this an external symbol, we don't want + to change anything. */ + if (output_bfd != (bfd *) NULL + && (symbol->flags & BSF_SECTION_SYM) == 0 + && reloc_entry->addend == 0) + { + reloc_entry->address += input_section->output_offset; + return bfd_reloc_ok; + } + + ret = bfd_reloc_ok; + if (symbol->section == &bfd_und_section + && output_bfd == (bfd *) NULL) + ret = bfd_reloc_undefined; + + if (bfd_is_com_section (symbol->section)) + relocation = 0; + else + relocation = symbol->value; + + relocation += symbol->section->output_section->vma; + relocation += symbol->section->output_offset; + relocation += reloc_entry->addend; + + if (reloc_entry->address > input_section->_cooked_size) + return bfd_reloc_outofrange; + + /* Save the information, and let LO16 do the actual relocation. */ + mips_hi16_addr = (bfd_byte *) data + reloc_entry->address; + mips_hi16_addend = relocation; + + if (output_bfd != (bfd *) NULL) + reloc_entry->address += input_section->output_offset; + + return ret; +} + +/* Do a R_MIPS_LO16 relocation. This is a straightforward 16 bit + inplace relocation; this function exists in order to do the + R_MIPS_HI16 relocation described above. */ + +static bfd_reloc_status_type +mips_elf_lo16_reloc (abfd, + reloc_entry, + symbol, + data, + input_section, + output_bfd) + bfd *abfd; + arelent *reloc_entry; + asymbol *symbol; + PTR data; + asection *input_section; + bfd *output_bfd; +{ + /* FIXME: The symbol _gp_disp requires special handling, which we do + not do. */ + if (strcmp (bfd_asymbol_name (symbol), "_gp_disp") == 0) + abort (); + + if (mips_hi16_addr != (bfd_byte *) NULL) + { + unsigned long insn; + unsigned long val; + unsigned long vallo; + + /* Do the HI16 relocation. Note that we actually don't need to + know anything about the LO16 itself, except where to find the + low 16 bits of the addend needed by the LO16. */ + insn = bfd_get_32 (abfd, mips_hi16_addr); + vallo = (bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address) + & 0xffff); + val = ((insn & 0xffff) << 16) + vallo; + val += mips_hi16_addend; + + /* The low order 16 bits are always treated as a signed value. + Therefore, a negative value in the low order bits requires an + adjustment in the high order bits. We need to make this + adjustment in two ways: once for the bits we took from the + data, and once for the bits we are putting back in to the + data. */ + if ((vallo & 0x8000) != 0) + val -= 0x10000; + if ((val & 0x8000) != 0) + val += 0x10000; + + insn = (insn &~ 0xffff) | ((val >> 16) & 0xffff); + bfd_put_32 (abfd, insn, mips_hi16_addr); + + mips_hi16_addr = (bfd_byte *) NULL; + } + + /* Now do the LO16 reloc in the usual way. */ + return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, + input_section, output_bfd); +} + +/* Do a R_MIPS_GPREL16 relocation. This is a 16 bit value which must + become the offset from the gp register. This function also handles + R_MIPS_LITERAL relocations, although those can be handled more + cleverly because the entries in the .lit8 and .lit4 sections can be + merged. */ + +static bfd_reloc_status_type +mips_elf_gprel16_reloc (abfd, + reloc_entry, + symbol, + data, + input_section, + output_bfd) + bfd *abfd; + arelent *reloc_entry; + asymbol *symbol; + PTR data; + asection *input_section; + bfd *output_bfd; +{ + boolean relocateable; + bfd_vma relocation; + unsigned long val; + unsigned long insn; + + /* If we're relocating, and this is an external symbol with no + addend, we don't want to change anything. We will only have an + addend if this is a newly created reloc, not read from an ELF + file. */ + if (output_bfd != (bfd *) NULL + && (symbol->flags & BSF_SECTION_SYM) == 0 + && reloc_entry->addend == 0) + { + reloc_entry->address += input_section->output_offset; + return bfd_reloc_ok; + } + + if (output_bfd != (bfd *) NULL) + relocateable = true; + else + { + relocateable = false; + output_bfd = symbol->section->output_section->owner; + } + + if (symbol->section == &bfd_und_section + && relocateable == false) + return bfd_reloc_undefined; + + /* We have to figure out the gp value, so that we can adjust the + symbol value correctly. We look up the symbol _gp in the output + BFD. If we can't find it, we're stuck. We cache it in the ELF + target data. We don't need to adjust the symbol value for an + external symbol if we are producing relocateable output. */ + if (elf_gp (output_bfd) == 0 + && (relocateable == false + || (symbol->flags & BSF_SECTION_SYM) != 0)) + { + if (relocateable != false) + { + /* Make up a value. */ + elf_gp (output_bfd) = + symbol->section->output_section->vma + 0x4000; + } + else + { + unsigned int count; + asymbol **sym; + unsigned int i; + + count = bfd_get_symcount (output_bfd); + sym = bfd_get_outsymbols (output_bfd); + + if (sym == (asymbol **) NULL) + i = count; + else + { + for (i = 0; i < count; i++, sym++) + { + register CONST char *name; + + name = bfd_asymbol_name (*sym); + if (*name == '_' && strcmp (name, "_gp") == 0) + { + elf_gp (output_bfd) = bfd_asymbol_value (*sym); + break; + } + } + } + + if (i >= count) + { + /* Only get the error once. */ + elf_gp (output_bfd) = 4; + /* FIXME: How can we get the program name here? */ + fprintf (stderr, + "GP relative relocation when _gp not defined\n"); + return bfd_reloc_dangerous; + } + } + } + + if (bfd_is_com_section (symbol->section)) + relocation = 0; + else + relocation = symbol->value; + + relocation += symbol->section->output_section->vma; + relocation += symbol->section->output_offset; + + if (reloc_entry->address > input_section->_cooked_size) + return bfd_reloc_outofrange; + + insn = bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address); + + /* Set val to the offset into the section or symbol. */ + val = ((insn & 0xffff) + reloc_entry->addend) & 0xffff; + if (val & 0x8000) + val -= 0x10000; + + /* Adjust val for the final section location and GP value. If we + are producing relocateable output, we don't want to do this for + an external symbol. */ + if (relocateable == false + || (symbol->flags & BSF_SECTION_SYM) != 0) + val += relocation - elf_gp (output_bfd); + + insn = (insn &~ 0xffff) | (val & 0xffff); + bfd_put_32 (abfd, insn, (bfd_byte *) data + reloc_entry->address); + + if (relocateable != false) + reloc_entry->address += input_section->output_offset; + + /* Make sure it fit in 16 bits. */ + if (val >= 0x8000 && val < 0xffff8000) + return bfd_reloc_outofrange; + + return bfd_reloc_ok; +} -/* This does not include any relocations, but should be good enough - for GDB. */ +/* A mapping from BFD reloc types to MIPS ELF reloc types. */ +struct elf_reloc_map { + bfd_reloc_code_real_type bfd_reloc_val; + enum reloc_type elf_reloc_val; +}; + +static CONST struct elf_reloc_map mips_reloc_map[] = +{ + { BFD_RELOC_NONE, R_MIPS_NONE, }, + { BFD_RELOC_16, R_MIPS_16 }, + { BFD_RELOC_32, R_MIPS_32 }, + { BFD_RELOC_CTOR, R_MIPS_32 }, + { BFD_RELOC_32_PCREL, R_MIPS_REL32 }, + { BFD_RELOC_MIPS_JMP, R_MIPS_26 }, + { BFD_RELOC_HI16_S, R_MIPS_HI16 }, + { BFD_RELOC_LO16, R_MIPS_LO16 }, + { BFD_RELOC_MIPS_GPREL, R_MIPS_GPREL16 }, + { BFD_RELOC_MIPS_LITERAL, R_MIPS_LITERAL }, + { BFD_RELOC_MIPS_GOT16, R_MIPS_GOT16 }, + { BFD_RELOC_16_PCREL, R_MIPS_PC16 }, + { BFD_RELOC_MIPS_CALL16, R_MIPS_CALL16 }, + { BFD_RELOC_MIPS_GPREL32, R_MIPS_GPREL32 } +}; + +/* Given a BFD reloc type, return a howto structure. */ + +static CONST struct reloc_howto_struct * +bfd_elf32_bfd_reloc_type_lookup (abfd, code) + bfd *abfd; + bfd_reloc_code_real_type code; +{ + int i; + + for (i = 0; i < sizeof (mips_reloc_map) / sizeof (struct elf_reloc_map); i++) + { + if (mips_reloc_map[i].bfd_reloc_val == code) + return &elf_mips_howto_table[(int) mips_reloc_map[i].elf_reloc_val]; + } + return NULL; +} + +/* Given a MIPS reloc type, fill in an arelent structure. */ + +static void +mips_info_to_howto_rel (abfd, cache_ptr, dst) + bfd *abfd; + arelent *cache_ptr; + Elf32_Internal_Rel *dst; +{ + unsigned int r_type; + + r_type = ELF32_R_TYPE (dst->r_info); + BFD_ASSERT (r_type < (unsigned int) R_MIPS_max); + cache_ptr->howto = &elf_mips_howto_table[r_type]; + + /* The addend for a GPREL16 or LITERAL relocation comes from the GP + value for the object file. We get the addend now, rather than + when we do the relocation, because the symbol manipulations done + by the linker may cause us to lose track of the input BFD. */ + if (((*cache_ptr->sym_ptr_ptr)->flags & BSF_SECTION_SYM) != 0 + && (r_type == (unsigned int) R_MIPS_GPREL16 + || r_type == (unsigned int) R_MIPS_LITERAL)) + cache_ptr->addend = elf_gp (abfd); +} + +/* A .reginfo section holds a single Elf32_RegInfo structure. These + routines swap this structure in and out. They are used outside of + BFD, so they are globally visible. */ + +void +bfd_mips_elf32_swap_reginfo_in (abfd, ex, in) + bfd *abfd; + const Elf32_External_RegInfo *ex; + Elf32_RegInfo *in; +{ + in->ri_gprmask = bfd_h_get_32 (abfd, (bfd_byte *) ex->ri_gprmask); + in->ri_cprmask[0] = bfd_h_get_32 (abfd, (bfd_byte *) ex->ri_cprmask[0]); + in->ri_cprmask[1] = bfd_h_get_32 (abfd, (bfd_byte *) ex->ri_cprmask[1]); + in->ri_cprmask[2] = bfd_h_get_32 (abfd, (bfd_byte *) ex->ri_cprmask[2]); + in->ri_cprmask[3] = bfd_h_get_32 (abfd, (bfd_byte *) ex->ri_cprmask[3]); + in->ri_gp_value = bfd_h_get_32 (abfd, (bfd_byte *) ex->ri_gp_value); +} + +void +bfd_mips_elf32_swap_reginfo_out (abfd, in, ex) + bfd *abfd; + const Elf32_RegInfo *in; + Elf32_External_RegInfo *ex; +{ + bfd_h_put_32 (abfd, (bfd_vma) in->ri_gprmask, + (bfd_byte *) ex->ri_gprmask); + bfd_h_put_32 (abfd, (bfd_vma) in->ri_cprmask[0], + (bfd_byte *) ex->ri_cprmask[0]); + bfd_h_put_32 (abfd, (bfd_vma) in->ri_cprmask[1], + (bfd_byte *) ex->ri_cprmask[1]); + bfd_h_put_32 (abfd, (bfd_vma) in->ri_cprmask[2], + (bfd_byte *) ex->ri_cprmask[2]); + bfd_h_put_32 (abfd, (bfd_vma) in->ri_cprmask[3], + (bfd_byte *) ex->ri_cprmask[3]); + bfd_h_put_32 (abfd, (bfd_vma) in->ri_gp_value, + (bfd_byte *) ex->ri_gp_value); +} + +/* Handle a MIPS specific section when reading an object file. This + is called when elfcode.h finds a section with an unknown type. + FIXME: We need to handle the SHF_MIPS_GPREL flag, but I'm not sure + how to. */ + +static boolean +mips_elf_section_from_shdr (abfd, hdr, name) + bfd *abfd; + Elf32_Internal_Shdr *hdr; + char *name; +{ + /* There ought to be a place to keep ELF backend specific flags, but + at the moment there isn't one. We just keep track of the + sections by their name, instead. Fortunately, the ABI gives + suggested names for all the MIPS specific sections, so we will + probably get away with this. */ + switch (hdr->sh_type) + { + case SHT_MIPS_LIBLIST: + if (strcmp (name, ".liblist") != 0) + return false; + break; + case SHT_MIPS_CONFLICT: + if (strcmp (name, ".conflict") != 0) + return false; + break; + case SHT_MIPS_GPTAB: + if (strncmp (name, ".gptab.", sizeof ".gptab." - 1) != 0) + return false; + break; + case SHT_MIPS_UCODE: + if (strcmp (name, ".ucode") != 0) + return false; + break; + case SHT_MIPS_DEBUG: + if (strcmp (name, ".mdebug") != 0) + return false; + break; + case SHT_MIPS_REGINFO: + if (strcmp (name, ".reginfo") != 0 + || hdr->sh_size != sizeof (Elf32_External_RegInfo)) + return false; + break; + default: + return false; + } + + if (hdr->rawdata == NULL) + { + asection *newsect; + + newsect = bfd_make_section (abfd, name); + if (newsect != NULL) + { + newsect->filepos = hdr->sh_offset; + newsect->flags |= SEC_HAS_CONTENTS; + newsect->vma = hdr->sh_addr; + newsect->_raw_size = hdr->sh_size; + newsect->alignment_power = bfd_log2 (hdr->sh_addralign); + + if (hdr->sh_flags & SHF_ALLOC) + { + newsect->flags |= SEC_ALLOC; + newsect->flags |= SEC_LOAD; + } + + if (!(hdr->sh_flags & SHF_WRITE)) + newsect->flags |= SEC_READONLY; + + if (hdr->sh_flags & SHF_EXECINSTR) + newsect->flags |= SEC_CODE; + else if (newsect->flags & SEC_ALLOC) + newsect->flags |= SEC_DATA; + + if (hdr->sh_type == SHT_MIPS_DEBUG) + newsect->flags |= SEC_DEBUGGING; + + hdr->rawdata = (void *) newsect; + + /* FIXME: We should record the sh_info field for a .gptab + section. */ + + /* For a .reginfo section, set the gp value in the tdata + information from the contents of this section. We need + the gp value while processing relocs, so we just get it + now. */ + if (hdr->sh_type == SHT_MIPS_REGINFO) + { + Elf32_External_RegInfo ext; + Elf32_RegInfo s; + + if (bfd_get_section_contents (abfd, newsect, (PTR) &ext, + (file_ptr) 0, + sizeof ext) == false) + return false; + bfd_mips_elf32_swap_reginfo_in (abfd, &ext, &s); + elf_gp (abfd) = s.ri_gp_value; + } + } + else + hdr->rawdata = (void *) bfd_get_section_by_name (abfd, name); + } + + return true; +} + +/* Set the correct type for a MIPS ELF section. We do this by the + section name, which is a hack, but ought to work. */ + +static boolean +mips_elf_fake_sections (abfd, hdr, sec) + bfd *abfd; + Elf32_Internal_Shdr *hdr; + asection *sec; +{ + register const char *name; + + name = bfd_get_section_name (abfd, sec); + + if (strcmp (name, ".liblist") == 0) + { + hdr->sh_type = SHT_MIPS_LIBLIST; + hdr->sh_info = sec->_raw_size / sizeof (Elf32_Lib); + /* FIXME: Set the sh_link field. */ + } + else if (strcmp (name, ".conflict") == 0) + hdr->sh_type = SHT_MIPS_CONFLICT; + else if (strncmp (name, ".gptab.", sizeof ".gptab." - 1) == 0) + { + hdr->sh_type = SHT_MIPS_GPTAB; + /* FIXME: Set the sh_info field. */ + } + else if (strcmp (name, ".ucode") == 0) + hdr->sh_type = SHT_MIPS_UCODE; + else if (strcmp (name, ".mdebug") == 0) + hdr->sh_type = SHT_MIPS_DEBUG; + else if (strcmp (name, ".reginfo") == 0) + { + hdr->sh_type = SHT_MIPS_REGINFO; + + /* Force the section size to the correct value, even if the + linker thinks it is larger. The link routine below will only + write out this much data for .reginfo. */ + hdr->sh_size = sec->_raw_size = sizeof (Elf32_External_RegInfo); + } + + return true; +} + +/* Given a BFD section, try to locate the corresponding ELF section + index. */ + +static boolean +mips_elf_section_from_bfd_section (abfd, hdr, sec, retval) + bfd *abfd; + Elf32_Internal_Shdr *hdr; + asection *sec; + int *retval; +{ + if (strcmp (bfd_get_section_name (abfd, sec), ".scommon") == 0) + { + *retval = SHN_MIPS_SCOMMON; + return true; + } + if ((asection *) hdr->rawdata == sec) + return true; + return false; +} + +/* Work over a section just before writing it out. We update the GP + value in the .reginfo section based on the value we are using. + FIXME: We recognize sections that need the SHF_MIPS_GPREL flag by + name; there has to be a better way. */ + +static boolean +mips_elf_section_processing (abfd, hdr) + bfd *abfd; + Elf32_Internal_Shdr *hdr; +{ + if (hdr->sh_type == SHT_MIPS_REGINFO) + { + bfd_byte buf[4]; + + BFD_ASSERT (hdr->sh_size == sizeof (Elf32_External_RegInfo)); + BFD_ASSERT (hdr->contents == NULL); + + if (bfd_seek (abfd, + hdr->sh_offset + sizeof (Elf32_External_RegInfo) - 4, + SEEK_SET) == -1) + return false; + bfd_h_put_32 (abfd, (bfd_vma) elf_gp (abfd), buf); + if (bfd_write (buf, (bfd_size_type) 1, (bfd_size_type) 4, abfd) != 4) + return false; + } + + if (hdr->rawdata != NULL) + { + const char *name = ((asection *) hdr->rawdata)->name; + + if (strcmp (name, ".sdata") == 0) + { + hdr->sh_flags |= SHF_ALLOC | SHF_WRITE | SHF_MIPS_GPREL; + hdr->sh_type = SHT_PROGBITS; + } + else if (strcmp (name, ".sbss") == 0) + { + hdr->sh_flags |= SHF_ALLOC | SHF_WRITE | SHF_MIPS_GPREL; + hdr->sh_type = SHT_NOBITS; + } + else if (strcmp (name, ".lit8") == 0 + || strcmp (name, ".lit4") == 0) + { + hdr->sh_flags |= SHF_ALLOC | SHF_WRITE | SHF_MIPS_GPREL; + hdr->sh_type = SHT_PROGBITS; + } + } + + return true; +} + +/* We need to use a special link routine to handle the .reginfo + section. We need to merge all the .reginfo sections together, not + write them all out sequentially. */ + +static boolean +mips_elf_seclet_link (abfd, data, relocateable) + bfd *abfd; + PTR data; + boolean relocateable; +{ + asection *sec; + Elf32_RegInfo reginfo; + + memset (®info, 0, sizeof reginfo); + + for (sec = abfd->sections; sec != (asection *) NULL; sec = sec->next) + { + if (strcmp (sec->name, ".reginfo") == 0) + { + bfd_seclet_type *p; + Elf32_External_RegInfo ext; + + /* We have found the .reginfo section in the output file. + Look through all the seclets comprising it and merge the + information together. */ + for (p = sec->seclets_head; + p != (bfd_seclet_type *) NULL; + p = p->next) + { + switch (p->type) + { + case bfd_indirect_seclet: + { + asection *input_section; + bfd *input_bfd; + Elf32_RegInfo sub; + + input_section = p->u.indirect.section; + input_bfd = input_section->owner; + BFD_ASSERT (input_section->_raw_size + == sizeof (Elf32_External_RegInfo)); + if (! bfd_get_section_contents (input_bfd, input_section, + (PTR) &ext, + (file_ptr) 0, + sizeof ext)) + return false; + + bfd_mips_elf32_swap_reginfo_in (input_bfd, &ext, &sub); + + reginfo.ri_gprmask |= sub.ri_gprmask; + reginfo.ri_cprmask[0] |= sub.ri_cprmask[0]; + reginfo.ri_cprmask[1] |= sub.ri_cprmask[1]; + reginfo.ri_cprmask[2] |= sub.ri_cprmask[2]; + reginfo.ri_cprmask[3] |= sub.ri_cprmask[3]; + + /* ri_gp_value is set by the function + mips_elf_section_processing when the section is + finally written out. */ + } + break; + + default: + break; + } + } + + /* Write out the information we have accumulated. */ + bfd_mips_elf32_swap_reginfo_out (abfd, ®info, &ext); + if (! bfd_set_section_contents (abfd, sec, (PTR) &ext, + (file_ptr) 0, sizeof ext)) + return false; + + /* Force the section size to the value we want. */ + sec->_raw_size = sizeof (Elf32_External_RegInfo); + + /* Force bfd_generic_seclet_link to ignore this section. */ + sec->seclets_head = (bfd_seclet_type *) NULL; + + break; + } + } + + return bfd_generic_seclet_link (abfd, data, relocateable); +} + +/* MIPS ELF uses two common sections. One is the usual one, and the + other is for small objects. All the small objects are kept + together, and then referenced via the gp pointer, which yields + faster assembler code. This is what we use for the small common + section. This approach is copied from ecoff.c. */ +static asection mips_elf_scom_section; +static asymbol mips_elf_scom_symbol; +static asymbol *mips_elf_scom_symbol_ptr; + +/* Handle the special MIPS section numbers that a symbol may use. */ + +static void +mips_elf_symbol_processing (abfd, asym) + bfd *abfd; + asymbol *asym; +{ + elf_symbol_type *elfsym; + + elfsym = (elf_symbol_type *) asym; + switch (elfsym->internal_elf_sym.st_shndx) + { + case SHN_MIPS_ACOMMON: + /* FIXME: I don't really understand just what this section + means or when it would be used. */ + abort (); + break; + + case SHN_COMMON: + /* Common symbols less than the GP size are automatically + treated as SHN_MIPS_SCOMMON symbols. */ + if (asym->value > elf_gp_size (abfd)) + break; + /* Fall through. */ + case SHN_MIPS_SCOMMON: + if (mips_elf_scom_section.name == NULL) + { + /* Initialize the small common section. */ + mips_elf_scom_section.name = ".scommon"; + mips_elf_scom_section.flags = SEC_IS_COMMON; + mips_elf_scom_section.output_section = &mips_elf_scom_section; + mips_elf_scom_section.symbol = &mips_elf_scom_symbol; + mips_elf_scom_section.symbol_ptr_ptr = &mips_elf_scom_symbol_ptr; + mips_elf_scom_symbol.name = ".scommon"; + mips_elf_scom_symbol.flags = BSF_SECTION_SYM; + mips_elf_scom_symbol.section = &mips_elf_scom_section; + mips_elf_scom_symbol_ptr = &mips_elf_scom_symbol; + } + asym->section = &mips_elf_scom_section; + asym->value = elfsym->internal_elf_sym.st_size; + break; + + case SHN_MIPS_SUNDEFINED: + asym->section = &bfd_und_section; + break; + } +} + #define TARGET_LITTLE_SYM bfd_elf32_littlemips_vec #define TARGET_LITTLE_NAME "elf32-littlemips" #define TARGET_BIG_SYM bfd_elf32_bigmips_vec #define TARGET_BIG_NAME "elf32-bigmips" #define ELF_ARCH bfd_arch_mips -#define bfd_elf32_bfd_reloc_type_lookup bfd_default_reloc_type_lookup -#define elf_info_to_howto bfd_elf32_no_info_to_howto +#define ELF_MAXPAGESIZE 0x10000 +#define elf_info_to_howto 0 +#define elf_info_to_howto_rel mips_info_to_howto_rel +#define elf_backend_section_from_shdr mips_elf_section_from_shdr +#define elf_backend_fake_sections mips_elf_fake_sections +#define elf_backend_section_from_bfd_section \ + mips_elf_section_from_bfd_section +#define elf_backend_section_processing mips_elf_section_processing +#define elf_backend_symbol_processing mips_elf_symbol_processing + +#define bfd_elf32_bfd_seclet_link mips_elf_seclet_link #include "elf32-target.h" |