diff options
Diffstat (limited to 'bfd/coff-mips.c')
| -rw-r--r-- | bfd/coff-mips.c | 1114 |
1 files changed, 34 insertions, 1080 deletions
diff --git a/bfd/coff-mips.c b/bfd/coff-mips.c index a5ad65a..cafc289 100644 --- a/bfd/coff-mips.c +++ b/bfd/coff-mips.c @@ -57,28 +57,12 @@ static bfd_reloc_status_type mips_reflo_reloc static bfd_reloc_status_type mips_gprel_reloc PARAMS ((bfd *abfd, arelent *reloc, asymbol *symbol, PTR data, asection *section, bfd *output_bfd, char **error)); -static bfd_reloc_status_type mips_relhi_reloc - PARAMS ((bfd *abfd, arelent *reloc, asymbol *symbol, PTR data, - asection *section, bfd *output_bfd, char **error)); -static bfd_reloc_status_type mips_rello_reloc - PARAMS ((bfd *abfd, arelent *reloc, asymbol *symbol, PTR data, - asection *section, bfd *output_bfd, char **error)); -static bfd_reloc_status_type mips_switch_reloc - PARAMS ((bfd *abfd, arelent *reloc, asymbol *symbol, PTR data, - asection *section, bfd *output_bfd, char **error)); static void mips_relocate_hi PARAMS ((struct internal_reloc *refhi, struct internal_reloc *reflo, bfd *input_bfd, asection *input_section, bfd_byte *contents, - size_t adjust, bfd_vma relocation, bfd_boolean pcrel)); + bfd_vma relocation)); static bfd_boolean mips_relocate_section PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, PTR)); -static bfd_boolean mips_read_relocs - PARAMS ((bfd *, asection *)); -static bfd_boolean mips_relax_section - PARAMS ((bfd *, asection *, struct bfd_link_info *, bfd_boolean *)); -static bfd_boolean mips_relax_pcrel16 - PARAMS ((struct bfd_link_info *, bfd *, asection *, - struct ecoff_link_hash_entry *, bfd_byte *, bfd_vma)); static reloc_howto_type *mips_bfd_reloc_type_lookup PARAMS ((bfd *, bfd_reloc_code_real_type)); @@ -243,10 +227,9 @@ static reloc_howto_type mips_howto_table[] = EMPTY_HOWTO (10), EMPTY_HOWTO (11), - /* This reloc is a Cygnus extension used when generating position - independent code for embedded systems. It represents a 16 bit PC - relative reloc rightshifted twice as used in the MIPS branch - instructions. */ + /* FIXME: This relocation is used (internally only) to represent branches + when assembling. It should never appear in output files, and + be removed. (It used to be used for embedded-PIC support.) */ HOWTO (MIPS_R_PCREL16, /* type */ 2, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ @@ -260,92 +243,10 @@ static reloc_howto_type mips_howto_table[] = 0xffff, /* src_mask */ 0xffff, /* dst_mask */ TRUE), /* pcrel_offset */ - - /* This reloc is a Cygnus extension used when generating position - independent code for embedded systems. It represents the high 16 - bits of a PC relative reloc. The next reloc must be - MIPS_R_RELLO, and the addend is formed from the addends of the - two instructions, just as in MIPS_R_REFHI and MIPS_R_REFLO. The - final value is actually PC relative to the location of the - MIPS_R_RELLO reloc, not the MIPS_R_RELHI reloc. */ - HOWTO (MIPS_R_RELHI, /* type */ - 16, /* rightshift */ - 2, /* size (0 = byte, 1 = short, 2 = long) */ - 16, /* bitsize */ - TRUE, /* pc_relative */ - 0, /* bitpos */ - complain_overflow_bitfield, /* complain_on_overflow */ - mips_relhi_reloc, /* special_function */ - "RELHI", /* name */ - TRUE, /* partial_inplace */ - 0xffff, /* src_mask */ - 0xffff, /* dst_mask */ - TRUE), /* pcrel_offset */ - - /* This reloc is a Cygnus extension used when generating position - independent code for embedded systems. It represents the low 16 - bits of a PC relative reloc. */ - HOWTO (MIPS_R_RELLO, /* type */ - 0, /* rightshift */ - 2, /* size (0 = byte, 1 = short, 2 = long) */ - 16, /* bitsize */ - TRUE, /* pc_relative */ - 0, /* bitpos */ - complain_overflow_dont, /* complain_on_overflow */ - mips_rello_reloc, /* special_function */ - "RELLO", /* name */ - TRUE, /* partial_inplace */ - 0xffff, /* src_mask */ - 0xffff, /* dst_mask */ - TRUE), /* pcrel_offset */ - - EMPTY_HOWTO (15), - EMPTY_HOWTO (16), - EMPTY_HOWTO (17), - EMPTY_HOWTO (18), - EMPTY_HOWTO (19), - EMPTY_HOWTO (20), - EMPTY_HOWTO (21), - - /* This reloc is a Cygnus extension used when generating position - independent code for embedded systems. It represents an entry in - a switch table, which is the difference between two symbols in - the .text section. The symndx is actually the offset from the - reloc address to the subtrahend. See include/coff/mips.h for - more details. */ - HOWTO (MIPS_R_SWITCH, /* type */ - 0, /* rightshift */ - 2, /* size (0 = byte, 1 = short, 2 = long) */ - 32, /* bitsize */ - TRUE, /* pc_relative */ - 0, /* bitpos */ - complain_overflow_dont, /* complain_on_overflow */ - mips_switch_reloc, /* special_function */ - "SWITCH", /* name */ - TRUE, /* partial_inplace */ - 0xffffffff, /* src_mask */ - 0xffffffff, /* dst_mask */ - TRUE) /* pcrel_offset */ }; #define MIPS_HOWTO_COUNT \ (sizeof mips_howto_table / sizeof mips_howto_table[0]) - -/* When the linker is doing relaxing, it may change an external PCREL16 - reloc. This typically represents an instruction like - bal foo - We change it to - .set noreorder - bal $L1 - lui $at,%hi(foo - $L1) - $L1: - addiu $at,%lo(foo - $L1) - addu $at,$at,$31 - jalr $at - PCREL16_EXPANSION_ADJUSTMENT is the number of bytes this changes the - instruction by. */ - -#define PCREL16_EXPANSION_ADJUSTMENT (4 * 4) /* See whether the magic number matches. */ @@ -418,25 +319,6 @@ mips_ecoff_swap_reloc_in (abfd, ext_ptr, intern) << RELOC_BITS3_TYPEHI_SH_LITTLE)); intern->r_extern = (ext->r_bits[3] & RELOC_BITS3_EXTERN_LITTLE) != 0; } - - /* If this is a MIPS_R_SWITCH reloc, or an internal MIPS_R_RELHI or - MIPS_R_RELLO reloc, r_symndx is actually the offset from the - reloc address to the base of the difference (see - include/coff/mips.h for more details). We copy symndx into the - r_offset field so as not to confuse ecoff_slurp_reloc_table in - ecoff.c. In adjust_reloc_in we then copy r_offset into the reloc - addend. */ - if (intern->r_type == MIPS_R_SWITCH - || (! intern->r_extern - && (intern->r_type == MIPS_R_RELLO - || intern->r_type == MIPS_R_RELHI))) - { - BFD_ASSERT (! intern->r_extern); - intern->r_offset = intern->r_symndx; - if (intern->r_offset & 0x800000) - intern->r_offset -= 0x1000000; - intern->r_symndx = RELOC_SECTION_TEXT; - } } /* Swap a reloc out. */ @@ -453,20 +335,7 @@ mips_ecoff_swap_reloc_out (abfd, intern, dst) BFD_ASSERT (intern->r_extern || (intern->r_symndx >= 0 && intern->r_symndx <= 12)); - /* If this is a MIPS_R_SWITCH reloc, or an internal MIPS_R_RELLO or - MIPS_R_RELHI reloc, we actually want to write the contents of - r_offset out as the symbol index. This undoes the change made by - mips_ecoff_swap_reloc_in. */ - if (intern->r_type != MIPS_R_SWITCH - && (intern->r_extern - || (intern->r_type != MIPS_R_RELHI - && intern->r_type != MIPS_R_RELLO))) - r_symndx = intern->r_symndx; - else - { - BFD_ASSERT (intern->r_symndx == RELOC_SECTION_TEXT); - r_symndx = intern->r_offset & 0xffffff; - } + r_symndx = intern->r_symndx; H_PUT_32 (abfd, intern->r_vaddr, ext->r_vaddr); if (bfd_header_big_endian (abfd)) @@ -501,7 +370,7 @@ mips_adjust_reloc_in (abfd, intern, rptr) const struct internal_reloc *intern; arelent *rptr; { - if (intern->r_type > MIPS_R_SWITCH) + if (intern->r_type > MIPS_R_PCREL16) abort (); if (! intern->r_extern @@ -514,18 +383,6 @@ mips_adjust_reloc_in (abfd, intern, rptr) if (intern->r_type == MIPS_R_IGNORE) rptr->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr; - /* If this is a MIPS_R_SWITCH reloc, or an internal MIPS_R_RELHI or - MIPS_R_RELLO reloc, we want the addend field of the BFD relocto - hold the value which was originally in the symndx field of the - internal MIPS ECOFF reloc. This value was copied into - intern->r_offset by mips_swap_reloc_in, and here we copy it into - the addend field. */ - if (intern->r_type == MIPS_R_SWITCH - || (! intern->r_extern - && (intern->r_type == MIPS_R_RELHI - || intern->r_type == MIPS_R_RELLO))) - rptr->addend = intern->r_offset; - rptr->howto = &mips_howto_table[intern->r_type]; } @@ -535,19 +392,9 @@ mips_adjust_reloc_in (abfd, intern, rptr) static void mips_adjust_reloc_out (abfd, rel, intern) bfd *abfd ATTRIBUTE_UNUSED; - const arelent *rel; - struct internal_reloc *intern; + const arelent *rel ATTRIBUTE_UNUSED; + struct internal_reloc *intern ATTRIBUTE_UNUSED; { - /* For a MIPS_R_SWITCH reloc, or an internal MIPS_R_RELHI or - MIPS_R_RELLO reloc, we must copy rel->addend into - intern->r_offset. This will then be written out as the symbol - index by mips_ecoff_swap_reloc_out. This operation parallels the - action of mips_adjust_reloc_in. */ - if (intern->r_type == MIPS_R_SWITCH - || (! intern->r_extern - && (intern->r_type == MIPS_R_RELHI - || intern->r_type == MIPS_R_RELLO))) - intern->r_offset = rel->addend; } /* ECOFF relocs are either against external symbols, or against @@ -880,209 +727,6 @@ mips_gprel_reloc (abfd, return bfd_reloc_ok; } -/* Do a RELHI relocation. We do this in conjunction with a RELLO - reloc, just as REFHI and REFLO are done together. RELHI and RELLO - are Cygnus extensions used when generating position independent - code for embedded systems. */ - -/* FIXME: This should not be a static variable. */ - -static struct mips_hi *mips_relhi_list; - -static bfd_reloc_status_type -mips_relhi_reloc (abfd, - reloc_entry, - symbol, - data, - input_section, - output_bfd, - error_message) - bfd *abfd ATTRIBUTE_UNUSED; - arelent *reloc_entry; - asymbol *symbol; - PTR data; - asection *input_section; - bfd *output_bfd; - char **error_message ATTRIBUTE_UNUSED; -{ - bfd_reloc_status_type ret; - bfd_vma relocation; - struct mips_hi *n; - - /* If this is a reloc against a section symbol, then it is correct - in the object file. The only time we want to change this case is - when we are relaxing, and that is handled entirely by - mips_relocate_section and never calls this function. */ - if ((symbol->flags & BSF_SECTION_SYM) != 0) - { - if (output_bfd != (bfd *) NULL) - reloc_entry->address += input_section->output_offset; - return bfd_reloc_ok; - } - - /* This is an external symbol. If we're relocating, we don't want - to change anything. */ - if (output_bfd != (bfd *) NULL) - { - reloc_entry->address += input_section->output_offset; - return bfd_reloc_ok; - } - - ret = bfd_reloc_ok; - if (bfd_is_und_section (symbol->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 RELLO do the actual relocation. */ - n = (struct mips_hi *) bfd_malloc ((bfd_size_type) sizeof *n); - if (n == NULL) - return bfd_reloc_outofrange; - n->addr = (bfd_byte *) data + reloc_entry->address; - n->addend = relocation; - n->next = mips_relhi_list; - mips_relhi_list = n; - - if (output_bfd != (bfd *) NULL) - reloc_entry->address += input_section->output_offset; - - return ret; -} - -/* Do a RELLO relocation. This is a straightforward 16 bit PC - relative relocation; this function exists in order to do the RELHI - relocation described above. */ - -static bfd_reloc_status_type -mips_rello_reloc (abfd, - reloc_entry, - symbol, - data, - input_section, - output_bfd, - error_message) - bfd *abfd; - arelent *reloc_entry; - asymbol *symbol; - PTR data; - asection *input_section; - bfd *output_bfd; - char **error_message; -{ - if (mips_relhi_list != NULL) - { - struct mips_hi *l; - - l = mips_relhi_list; - while (l != NULL) - { - unsigned long insn; - unsigned long val; - unsigned long vallo; - struct mips_hi *next; - - /* Do the RELHI relocation. Note that we actually don't - need to know anything about the RELLO itself, except - where to find the low 16 bits of the addend needed by the - RELHI. */ - insn = bfd_get_32 (abfd, l->addr); - vallo = (bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address) - & 0xffff); - val = ((insn & 0xffff) << 16) + vallo; - val += l->addend; - - /* If the symbol is defined, make val PC relative. If the - symbol is not defined we don't want to do this, because - we don't want the value in the object file to incorporate - the address of the reloc. */ - if (! bfd_is_und_section (bfd_get_section (symbol)) - && ! bfd_is_com_section (bfd_get_section (symbol))) - val -= (input_section->output_section->vma - + input_section->output_offset - + reloc_entry->address); - - /* 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 &~ (unsigned) 0xffff) | ((val >> 16) & 0xffff); - bfd_put_32 (abfd, (bfd_vma) insn, l->addr); - - next = l->next; - free (l); - l = next; - } - - mips_relhi_list = NULL; - } - - /* If this is a reloc against a section symbol, then it is correct - in the object file. The only time we want to change this case is - when we are relaxing, and that is handled entirely by - mips_relocate_section and never calls this function. */ - if ((symbol->flags & BSF_SECTION_SYM) != 0) - { - if (output_bfd != (bfd *) NULL) - reloc_entry->address += input_section->output_offset; - return bfd_reloc_ok; - } - - /* bfd_perform_relocation does not handle pcrel_offset relocations - correctly when generating a relocatable file, so handle them - directly here. */ - if (output_bfd != (bfd *) NULL) - { - reloc_entry->address += input_section->output_offset; - return bfd_reloc_ok; - } - - /* Now do the RELLO reloc in the usual way. */ - return mips_generic_reloc (abfd, reloc_entry, symbol, data, - input_section, output_bfd, error_message); -} - -/* This is the special function for the MIPS_R_SWITCH reloc. This - special reloc is normally correct in the object file, and only - requires special handling when relaxing. We don't want - bfd_perform_relocation to tamper with it at all. */ - -static bfd_reloc_status_type -mips_switch_reloc (abfd, - reloc_entry, - symbol, - data, - input_section, - output_bfd, - error_message) - bfd *abfd ATTRIBUTE_UNUSED; - arelent *reloc_entry ATTRIBUTE_UNUSED; - asymbol *symbol ATTRIBUTE_UNUSED; - PTR data ATTRIBUTE_UNUSED; - asection *input_section ATTRIBUTE_UNUSED; - bfd *output_bfd ATTRIBUTE_UNUSED; - char **error_message ATTRIBUTE_UNUSED; -{ - return bfd_reloc_ok; -} - /* Get the howto structure for a generic reloc type. */ static reloc_howto_type * @@ -1119,15 +763,6 @@ mips_bfd_reloc_type_lookup (abfd, code) case BFD_RELOC_16_PCREL_S2: mips_type = MIPS_R_PCREL16; break; - case BFD_RELOC_PCREL_HI16_S: - mips_type = MIPS_R_RELHI; - break; - case BFD_RELOC_PCREL_LO16: - mips_type = MIPS_R_RELLO; - break; - case BFD_RELOC_GPREL32: - mips_type = MIPS_R_SWITCH; - break; default: return (reloc_howto_type *) NULL; } @@ -1136,21 +771,19 @@ mips_bfd_reloc_type_lookup (abfd, code) } /* A helper routine for mips_relocate_section which handles the REFHI - and RELHI relocations. The REFHI relocation must be followed by a - REFLO relocation (and RELHI by a RELLO), and the addend used is - formed from the addends of both instructions. */ + relocations. The REFHI relocation must be followed by a REFLO + relocation, and the addend used is formed from the addends of both + instructions. */ static void -mips_relocate_hi (refhi, reflo, input_bfd, input_section, contents, adjust, - relocation, pcrel) +mips_relocate_hi (refhi, reflo, input_bfd, input_section, contents, + relocation) struct internal_reloc *refhi; struct internal_reloc *reflo; bfd *input_bfd; asection *input_section; bfd_byte *contents; - size_t adjust; bfd_vma relocation; - bfd_boolean pcrel; { unsigned long insn; unsigned long val; @@ -1160,12 +793,12 @@ mips_relocate_hi (refhi, reflo, input_bfd, input_section, contents, adjust, return; insn = bfd_get_32 (input_bfd, - contents + adjust + refhi->r_vaddr - input_section->vma); + contents + refhi->r_vaddr - input_section->vma); if (reflo == NULL) vallo = 0; else vallo = (bfd_get_32 (input_bfd, - contents + adjust + reflo->r_vaddr - input_section->vma) + contents + reflo->r_vaddr - input_section->vma) & 0xffff); val = ((insn & 0xffff) << 16) + vallo; @@ -1179,17 +812,12 @@ mips_relocate_hi (refhi, reflo, input_bfd, input_section, contents, adjust, if ((vallo & 0x8000) != 0) val -= 0x10000; - if (pcrel) - val -= (input_section->output_section->vma - + input_section->output_offset - + (reflo->r_vaddr - input_section->vma + adjust)); - if ((val & 0x8000) != 0) val += 0x10000; insn = (insn &~ (unsigned) 0xffff) | ((val >> 16) & 0xffff); bfd_put_32 (input_bfd, (bfd_vma) insn, - contents + adjust + refhi->r_vaddr - input_section->vma); + contents + refhi->r_vaddr - input_section->vma); } /* Relocate a section while linking a MIPS ECOFF file. */ @@ -1208,8 +836,6 @@ mips_relocate_section (output_bfd, info, input_bfd, input_section, struct ecoff_link_hash_entry **sym_hashes; bfd_vma gp; bfd_boolean gp_undefined; - size_t adjust; - long *offsets; struct external_reloc *ext_rel; struct external_reloc *ext_rel_end; unsigned int i; @@ -1270,13 +896,6 @@ mips_relocate_section (output_bfd, info, input_bfd, input_section, got_lo = FALSE; - adjust = 0; - - if (ecoff_section_data (input_bfd, input_section) == NULL) - offsets = NULL; - else - offsets = ecoff_section_data (input_bfd, input_section)->offsets; - ext_rel = (struct external_reloc *) external_relocs; ext_rel_end = ext_rel + input_section->reloc_count; for (i = 0; ext_rel < ext_rel_end; ext_rel++, i++) @@ -1301,17 +920,15 @@ mips_relocate_section (output_bfd, info, input_bfd, input_section, BFD_ASSERT (int_rel.r_type < sizeof mips_howto_table / sizeof mips_howto_table[0]); - /* The REFHI and RELHI relocs requires special handling. they - must be followed by a REFLO or RELLO reloc, respectively, and - the addend is formed from both relocs. */ - if (int_rel.r_type == MIPS_R_REFHI - || int_rel.r_type == MIPS_R_RELHI) + /* The REFHI reloc requires special handling. It must be followed + by a REFLO reloc, and the addend is formed from both relocs. */ + if (int_rel.r_type == MIPS_R_REFHI) { struct external_reloc *lo_ext_rel; /* As a GNU extension, permit an arbitrary number of REFHI - or RELHI relocs before the REFLO or RELLO reloc. This - permits gcc to emit the HI and LO relocs itself. */ + relocs before the REFLO reloc. This permits gcc to emit + the HI and LO relocs itself. */ for (lo_ext_rel = ext_rel + 1; lo_ext_rel < ext_rel_end; lo_ext_rel++) @@ -1323,10 +940,7 @@ mips_relocate_section (output_bfd, info, input_bfd, input_section, } if (lo_ext_rel < ext_rel_end - && (lo_int_rel.r_type - == (int_rel.r_type == MIPS_R_REFHI - ? MIPS_R_REFLO - : MIPS_R_RELLO)) + && lo_int_rel.r_type == MIPS_R_REFLO && int_rel.r_extern == lo_int_rel.r_extern && int_rel.r_symndx == lo_int_rel.r_symndx) { @@ -1338,32 +952,6 @@ mips_relocate_section (output_bfd, info, input_bfd, input_section, howto = &mips_howto_table[int_rel.r_type]; - /* The SWITCH reloc must be handled specially. This reloc is - marks the location of a difference between two portions of an - object file. The symbol index does not reference a symbol, - but is actually the offset from the reloc to the subtrahend - of the difference. This reloc is correct in the object file, - and needs no further adjustment, unless we are relaxing. If - we are relaxing, we may have to add in an offset. Since no - symbols are involved in this reloc, we handle it completely - here. */ - if (int_rel.r_type == MIPS_R_SWITCH) - { - if (offsets != NULL - && offsets[i] != 0) - { - r = _bfd_relocate_contents (howto, input_bfd, - (bfd_vma) offsets[i], - (contents - + adjust - + int_rel.r_vaddr - - input_section->vma)); - BFD_ASSERT (r == bfd_reloc_ok); - } - - continue; - } - if (int_rel.r_extern) { h = sym_hashes[int_rel.r_symndx]; @@ -1439,91 +1027,6 @@ mips_relocate_section (output_bfd, info, input_bfd, input_section, } } - /* If we are relaxing, mips_relax_section may have set - offsets[i] to some value. A value of 1 means we must expand - a PC relative branch into a multi-instruction of sequence, - and any other value is an addend. */ - if (offsets != NULL - && offsets[i] != 0) - { - BFD_ASSERT (! info->relocatable); - BFD_ASSERT (int_rel.r_type == MIPS_R_PCREL16 - || int_rel.r_type == MIPS_R_RELHI - || int_rel.r_type == MIPS_R_RELLO); - if (offsets[i] != 1) - addend += offsets[i]; - else - { - bfd_byte *here; - - BFD_ASSERT (int_rel.r_extern - && int_rel.r_type == MIPS_R_PCREL16); - - /* Move the rest of the instructions up. */ - here = (contents - + adjust - + int_rel.r_vaddr - - input_section->vma); - memmove (here + PCREL16_EXPANSION_ADJUSTMENT, here, - (size_t) (input_section->_raw_size - - (int_rel.r_vaddr - input_section->vma))); - - /* Generate the new instructions. */ - if (! mips_relax_pcrel16 (info, input_bfd, input_section, - h, here, - (input_section->output_section->vma - + input_section->output_offset - + (int_rel.r_vaddr - - input_section->vma) - + adjust))) - return FALSE; - - /* We must adjust everything else up a notch. */ - adjust += PCREL16_EXPANSION_ADJUSTMENT; - - /* mips_relax_pcrel16 handles all the details of this - relocation. */ - continue; - } - } - - /* If we are relaxing, and this is a reloc against the .text - segment, we may need to adjust it if some branches have been - expanded. The reloc types which are likely to occur in the - .text section are handled efficiently by mips_relax_section, - and thus do not need to be handled here. */ - if (ecoff_data (input_bfd)->debug_info.adjust != NULL - && ! int_rel.r_extern - && int_rel.r_symndx == RELOC_SECTION_TEXT - && (strcmp (bfd_get_section_name (input_bfd, input_section), - ".text") != 0 - || (int_rel.r_type != MIPS_R_PCREL16 - && int_rel.r_type != MIPS_R_SWITCH - && int_rel.r_type != MIPS_R_RELHI - && int_rel.r_type != MIPS_R_RELLO))) - { - bfd_vma adr; - struct ecoff_value_adjust *a; - - /* We need to get the addend so that we know whether we need - to adjust the address. */ - BFD_ASSERT (int_rel.r_type == MIPS_R_REFWORD); - - adr = bfd_get_32 (input_bfd, - (contents - + adjust - + int_rel.r_vaddr - - input_section->vma)); - - for (a = ecoff_data (input_bfd)->debug_info.adjust; - a != (struct ecoff_value_adjust *) NULL; - a = a->next) - { - if (adr >= a->start && adr < a->end) - addend += a->adjust; - } - } - if (info->relocatable) { /* We are generating relocatable output, and must convert @@ -1601,49 +1104,7 @@ mips_relocate_section (output_bfd, info, input_bfd, input_section, currently holds just the addend. We must adjust by the address to get the right value. */ if (howto->pc_relative) - { - relocation -= int_rel.r_vaddr - input_section->vma; - - /* If we are converting a RELHI or RELLO reloc - from being against an external symbol to - being against a section, we must put a - special value into the r_offset field. This - value is the old addend. The r_offset for - both the RELHI and RELLO relocs are the same, - and we set both when we see RELHI. */ - if (int_rel.r_type == MIPS_R_RELHI) - { - long addhi, addlo; - - addhi = bfd_get_32 (input_bfd, - (contents - + adjust - + int_rel.r_vaddr - - input_section->vma)); - addhi &= 0xffff; - if (addhi & 0x8000) - addhi -= 0x10000; - addhi <<= 16; - - if (! use_lo) - addlo = 0; - else - { - addlo = bfd_get_32 (input_bfd, - (contents - + adjust - + lo_int_rel.r_vaddr - - input_section->vma)); - addlo &= 0xffff; - if (addlo & 0x8000) - addlo -= 0x10000; - - lo_int_rel.r_offset = addhi + addlo; - } - - int_rel.r_offset = addhi + addlo; - } - } + relocation -= int_rel.r_vaddr - input_section->vma; h = NULL; } @@ -1679,14 +1140,8 @@ mips_relocate_section (output_bfd, info, input_bfd, input_section, /* Adjust a PC relative relocation by removing the reference to the original address in the section and including the - reference to the new address. However, external RELHI - and RELLO relocs are PC relative, but don't include any - reference to the address. The addend is merely an - addend. */ - if (howto->pc_relative - && (! int_rel.r_extern - || (int_rel.r_type != MIPS_R_RELHI - && int_rel.r_type != MIPS_R_RELLO))) + reference to the new address. */ + if (howto->pc_relative) relocation -= (input_section->output_section->vma + input_section->output_offset - input_section->vma); @@ -1696,11 +1151,9 @@ mips_relocate_section (output_bfd, info, input_bfd, input_section, r = bfd_reloc_ok; else { - if (int_rel.r_type != MIPS_R_REFHI - && int_rel.r_type != MIPS_R_RELHI) + if (int_rel.r_type != MIPS_R_REFHI) r = _bfd_relocate_contents (howto, input_bfd, relocation, (contents - + adjust + int_rel.r_vaddr - input_section->vma)); else @@ -1708,8 +1161,7 @@ mips_relocate_section (output_bfd, info, input_bfd, input_section, mips_relocate_hi (&int_rel, use_lo ? &lo_int_rel : NULL, input_bfd, input_section, contents, - adjust, relocation, - int_rel.r_type == MIPS_R_RELHI); + relocation); r = bfd_reloc_ok; } } @@ -1759,32 +1211,24 @@ mips_relocate_section (output_bfd, info, input_bfd, input_section, file. Make it look like a pcrel_offset relocation by adding in the start address. */ if (howto->pc_relative) - { - if (int_rel.r_type != MIPS_R_RELHI || ! use_lo) - relocation += int_rel.r_vaddr + adjust; - else - relocation += lo_int_rel.r_vaddr + adjust; - } + relocation += int_rel.r_vaddr; } - if (int_rel.r_type != MIPS_R_REFHI - && int_rel.r_type != MIPS_R_RELHI) + if (int_rel.r_type != MIPS_R_REFHI) r = _bfd_final_link_relocate (howto, input_bfd, input_section, contents, (int_rel.r_vaddr - - input_section->vma - + adjust), + - input_section->vma), relocation, addend); else { mips_relocate_hi (&int_rel, use_lo ? &lo_int_rel : NULL, - input_bfd, input_section, contents, adjust, - relocation, - int_rel.r_type == MIPS_R_RELHI); + input_bfd, input_section, contents, + relocation); r = bfd_reloc_ok; } } @@ -1801,8 +1245,7 @@ mips_relocate_section (output_bfd, info, input_bfd, input_section, & 0xf0000000) != ((input_section->output_section->vma + input_section->output_offset - + (int_rel.r_vaddr - input_section->vma) - + adjust) + + (int_rel.r_vaddr - input_section->vma)) & 0xf0000000))) r = bfd_reloc_overflow; @@ -1835,495 +1278,6 @@ mips_relocate_section (output_bfd, info, input_bfd, input_section, return TRUE; } -/* Read in the relocs for a section. */ - -static bfd_boolean -mips_read_relocs (abfd, sec) - bfd *abfd; - asection *sec; -{ - struct ecoff_section_tdata *section_tdata; - bfd_size_type amt; - - section_tdata = ecoff_section_data (abfd, sec); - if (section_tdata == (struct ecoff_section_tdata *) NULL) - { - amt = sizeof (struct ecoff_section_tdata); - sec->used_by_bfd = (PTR) bfd_alloc (abfd, amt); - if (sec->used_by_bfd == NULL) - return FALSE; - - section_tdata = ecoff_section_data (abfd, sec); - section_tdata->external_relocs = NULL; - section_tdata->contents = NULL; - section_tdata->offsets = NULL; - } - - if (section_tdata->external_relocs == NULL) - { - amt = ecoff_backend (abfd)->external_reloc_size; - amt *= sec->reloc_count; - section_tdata->external_relocs = (PTR) bfd_alloc (abfd, amt); - if (section_tdata->external_relocs == NULL && amt != 0) - return FALSE; - - if (bfd_seek (abfd, sec->rel_filepos, SEEK_SET) != 0 - || bfd_bread (section_tdata->external_relocs, amt, abfd) != amt) - return FALSE; - } - - return TRUE; -} - -/* Relax a section when linking a MIPS ECOFF file. This is used for - embedded PIC code, which always uses PC relative branches which - only have an 18 bit range on MIPS. If a branch is not in range, we - generate a long instruction sequence to compensate. Each time we - find a branch to expand, we have to check all the others again to - make sure they are still in range. This is slow, but it only has - to be done when -relax is passed to the linker. - - This routine figures out which branches need to expand; the actual - expansion is done in mips_relocate_section when the section - contents are relocated. The information is stored in the offsets - field of the ecoff_section_tdata structure. An offset of 1 means - that the branch must be expanded into a multi-instruction PC - relative branch (such an offset will only occur for a PC relative - branch to an external symbol). Any other offset must be a multiple - of four, and is the amount to change the branch by (such an offset - will only occur for a PC relative branch within the same section). - - We do not modify the section relocs or contents themselves so that - if memory usage becomes an issue we can discard them and read them - again. The only information we must save in memory between this - routine and the mips_relocate_section routine is the table of - offsets. */ - -static bfd_boolean -mips_relax_section (abfd, sec, info, again) - bfd *abfd; - asection *sec; - struct bfd_link_info *info; - bfd_boolean *again; -{ - struct ecoff_section_tdata *section_tdata; - bfd_byte *contents = NULL; - long *offsets; - struct external_reloc *ext_rel; - struct external_reloc *ext_rel_end; - unsigned int i; - - /* Assume we are not going to need another pass. */ - *again = FALSE; - - /* If we are not generating an ECOFF file, this is much too - confusing to deal with. */ - if (info->hash->creator->flavour != bfd_get_flavour (abfd)) - return TRUE; - - /* If there are no relocs, there is nothing to do. */ - if (sec->reloc_count == 0) - return TRUE; - - /* We are only interested in PC relative relocs, and why would there - ever be one from anything but the .text section? */ - if (strcmp (bfd_get_section_name (abfd, sec), ".text") != 0) - return TRUE; - - /* Read in the relocs, if we haven't already got them. */ - section_tdata = ecoff_section_data (abfd, sec); - if (section_tdata == (struct ecoff_section_tdata *) NULL - || section_tdata->external_relocs == NULL) - { - if (! mips_read_relocs (abfd, sec)) - goto error_return; - section_tdata = ecoff_section_data (abfd, sec); - } - - if (sec->_cooked_size == 0) - { - /* We must initialize _cooked_size only the first time we are - called. */ - sec->_cooked_size = sec->_raw_size; - } - - contents = section_tdata->contents; - offsets = section_tdata->offsets; - - /* Look for any external PC relative relocs. Internal PC relative - relocs are already correct in the object file, so they certainly - can not overflow. */ - ext_rel = (struct external_reloc *) section_tdata->external_relocs; - ext_rel_end = ext_rel + sec->reloc_count; - for (i = 0; ext_rel < ext_rel_end; ext_rel++, i++) - { - struct internal_reloc int_rel; - struct ecoff_link_hash_entry *h; - asection *hsec; - bfd_signed_vma relocation; - struct external_reloc *adj_ext_rel; - unsigned int adj_i; - unsigned long ext_count; - struct ecoff_link_hash_entry **adj_h_ptr; - struct ecoff_link_hash_entry **adj_h_ptr_end; - struct ecoff_value_adjust *adjust; - bfd_size_type amt; - - /* If we have already expanded this reloc, we certainly don't - need to do it again. */ - if (offsets != (long *) NULL && offsets[i] == 1) - continue; - - /* Quickly check that this reloc is external PCREL16. */ - if (bfd_header_big_endian (abfd)) - { - if ((ext_rel->r_bits[3] & RELOC_BITS3_EXTERN_BIG) == 0 - || (((ext_rel->r_bits[3] & RELOC_BITS3_TYPE_BIG) - >> RELOC_BITS3_TYPE_SH_BIG) - != MIPS_R_PCREL16)) - continue; - } - else - { - if ((ext_rel->r_bits[3] & RELOC_BITS3_EXTERN_LITTLE) == 0 - || (((ext_rel->r_bits[3] & RELOC_BITS3_TYPE_LITTLE) - >> RELOC_BITS3_TYPE_SH_LITTLE) - != MIPS_R_PCREL16)) - continue; - } - - mips_ecoff_swap_reloc_in (abfd, (PTR) ext_rel, &int_rel); - - h = ecoff_data (abfd)->sym_hashes[int_rel.r_symndx]; - if (h == (struct ecoff_link_hash_entry *) NULL) - abort (); - - if (h->root.type != bfd_link_hash_defined - && h->root.type != bfd_link_hash_defweak) - { - /* Just ignore undefined symbols. These will presumably - generate an error later in the link. */ - continue; - } - - /* Get the value of the symbol. */ - hsec = h->root.u.def.section; - relocation = (h->root.u.def.value - + hsec->output_section->vma - + hsec->output_offset); - - /* Subtract out the current address. */ - relocation -= (sec->output_section->vma - + sec->output_offset - + (int_rel.r_vaddr - sec->vma)); - - /* The addend is stored in the object file. In the normal case - of ``bal symbol'', the addend will be -4. It will only be - different in the case of ``bal symbol+constant''. To avoid - always reading in the section contents, we don't check the - addend in the object file (we could easily check the contents - if we happen to have already read them in, but I fear that - this could be confusing). This means we will screw up if - there is a branch to a symbol that is in range, but added to - a constant which puts it out of range; in such a case the - link will fail with a reloc overflow error. Since the - compiler will never generate such code, it should be easy - enough to work around it by changing the assembly code in the - source file. */ - relocation -= 4; - - /* Now RELOCATION is the number we want to put in the object - file. See whether it fits. */ - if (relocation >= -0x20000 && relocation < 0x20000) - continue; - - /* Now that we know this reloc needs work, which will rarely - happen, go ahead and grab the section contents. */ - if (contents == (bfd_byte *) NULL) - { - if (info->keep_memory) - contents = (bfd_byte *) bfd_alloc (abfd, sec->_raw_size); - else - contents = (bfd_byte *) bfd_malloc (sec->_raw_size); - if (contents == (bfd_byte *) NULL) - goto error_return; - if (! bfd_get_section_contents (abfd, sec, (PTR) contents, - (file_ptr) 0, sec->_raw_size)) - goto error_return; - if (info->keep_memory) - section_tdata->contents = contents; - } - - /* We only support changing the bal instruction. It would be - possible to handle other PC relative branches, but some of - them (the conditional branches) would require a different - length instruction sequence which would complicate both this - routine and mips_relax_pcrel16. It could be written if - somebody felt it were important. Ignoring this reloc will - presumably cause a reloc overflow error later on. */ - if (bfd_get_32 (abfd, contents + int_rel.r_vaddr - sec->vma) - != 0x0411ffff) /* bgezal $0,. == bal . */ - continue; - - /* Bother. We need to expand this reloc, and we will need to - make another relaxation pass since this change may put other - relocs out of range. We need to examine the local branches - and we need to allocate memory to hold the offsets we must - add to them. We also need to adjust the values of all - symbols in the object file following this location. */ - - sec->_cooked_size += PCREL16_EXPANSION_ADJUSTMENT; - *again = TRUE; - - if (offsets == (long *) NULL) - { - bfd_size_type size; - - size = (bfd_size_type) sec->reloc_count * sizeof (long); - offsets = (long *) bfd_zalloc (abfd, size); - if (offsets == (long *) NULL) - goto error_return; - section_tdata->offsets = offsets; - } - - offsets[i] = 1; - - /* Now look for all PC relative references that cross this reloc - and adjust their offsets. */ - adj_ext_rel = (struct external_reloc *) section_tdata->external_relocs; - for (adj_i = 0; adj_ext_rel < ext_rel_end; adj_ext_rel++, adj_i++) - { - struct internal_reloc adj_int_rel; - bfd_vma start, stop; - int change; - - mips_ecoff_swap_reloc_in (abfd, (PTR) adj_ext_rel, &adj_int_rel); - - if (adj_int_rel.r_type == MIPS_R_PCREL16) - { - unsigned long insn; - - /* We only care about local references. External ones - will be relocated correctly anyhow. */ - if (adj_int_rel.r_extern) - continue; - - /* We are only interested in a PC relative reloc within - this section. FIXME: Cross section PC relative - relocs may not be handled correctly; does anybody - care? */ - if (adj_int_rel.r_symndx != RELOC_SECTION_TEXT) - continue; - - start = adj_int_rel.r_vaddr; - - insn = bfd_get_32 (abfd, - contents + adj_int_rel.r_vaddr - sec->vma); - - stop = (insn & 0xffff) << 2; - if ((stop & 0x20000) != 0) - stop -= 0x40000; - stop += adj_int_rel.r_vaddr + 4; - } - else if (adj_int_rel.r_type == MIPS_R_RELHI) - { - struct internal_reloc rello; - long addhi, addlo; - - /* The next reloc must be MIPS_R_RELLO, and we handle - them together. */ - BFD_ASSERT (adj_ext_rel + 1 < ext_rel_end); - - mips_ecoff_swap_reloc_in (abfd, (PTR) (adj_ext_rel + 1), &rello); - - BFD_ASSERT (rello.r_type == MIPS_R_RELLO); - - addhi = bfd_get_32 (abfd, - contents + adj_int_rel.r_vaddr - sec->vma); - addhi &= 0xffff; - if (addhi & 0x8000) - addhi -= 0x10000; - addhi <<= 16; - - addlo = bfd_get_32 (abfd, contents + rello.r_vaddr - sec->vma); - addlo &= 0xffff; - if (addlo & 0x8000) - addlo -= 0x10000; - - if (adj_int_rel.r_extern) - { - /* The value we want here is - sym - RELLOaddr + addend - which we can express as - sym - (RELLOaddr - addend) - Therefore if we are expanding the area between - RELLOaddr and RELLOaddr - addend we must adjust - the addend. This is admittedly ambiguous, since - we might mean (sym + addend) - RELLOaddr, but in - practice we don't, and there is no way to handle - that case correctly since at this point we have - no idea whether any reloc is being expanded - between sym and sym + addend. */ - start = rello.r_vaddr - (addhi + addlo); - stop = rello.r_vaddr; - } - else - { - /* An internal RELHI/RELLO pair represents the - difference between two addresses, $LC0 - foo. - The symndx value is actually the difference - between the reloc address and $LC0. This lets us - compute $LC0, and, by considering the addend, - foo. If the reloc we are expanding falls between - those two relocs, we must adjust the addend. At - this point, the symndx value is actually in the - r_offset field, where it was put by - mips_ecoff_swap_reloc_in. */ - start = rello.r_vaddr - adj_int_rel.r_offset; - stop = start + addhi + addlo; - } - } - else if (adj_int_rel.r_type == MIPS_R_SWITCH) - { - /* A MIPS_R_SWITCH reloc represents a word of the form - .word $L3-$LS12 - The value in the object file is correct, assuming the - original value of $L3. The symndx value is actually - the difference between the reloc address and $LS12. - This lets us compute the original value of $LS12 as - vaddr - symndx - and the original value of $L3 as - vaddr - symndx + addend - where addend is the value from the object file. At - this point, the symndx value is actually found in the - r_offset field, since it was moved by - mips_ecoff_swap_reloc_in. */ - start = adj_int_rel.r_vaddr - adj_int_rel.r_offset; - stop = start + bfd_get_32 (abfd, - (contents - + adj_int_rel.r_vaddr - - sec->vma)); - } - else - continue; - - /* If the range expressed by this reloc, which is the - distance between START and STOP crosses the reloc we are - expanding, we must adjust the offset. The sign of the - adjustment depends upon the direction in which the range - crosses the reloc being expanded. */ - if (start <= int_rel.r_vaddr && stop > int_rel.r_vaddr) - change = PCREL16_EXPANSION_ADJUSTMENT; - else if (start > int_rel.r_vaddr && stop <= int_rel.r_vaddr) - change = - PCREL16_EXPANSION_ADJUSTMENT; - else - change = 0; - - offsets[adj_i] += change; - - if (adj_int_rel.r_type == MIPS_R_RELHI) - { - adj_ext_rel++; - adj_i++; - offsets[adj_i] += change; - } - } - - /* Find all symbols in this section defined by this object file - and adjust their values. Note that we decide whether to - adjust the value based on the value stored in the ECOFF EXTR - structure, because the value stored in the hash table may - have been changed by an earlier expanded reloc and thus may - no longer correctly indicate whether the symbol is before or - after the expanded reloc. */ - ext_count = ecoff_data (abfd)->debug_info.symbolic_header.iextMax; - adj_h_ptr = ecoff_data (abfd)->sym_hashes; - adj_h_ptr_end = adj_h_ptr + ext_count; - for (; adj_h_ptr < adj_h_ptr_end; adj_h_ptr++) - { - struct ecoff_link_hash_entry *adj_h; - - adj_h = *adj_h_ptr; - if (adj_h != (struct ecoff_link_hash_entry *) NULL - && (adj_h->root.type == bfd_link_hash_defined - || adj_h->root.type == bfd_link_hash_defweak) - && adj_h->root.u.def.section == sec - && adj_h->esym.asym.value > int_rel.r_vaddr) - adj_h->root.u.def.value += PCREL16_EXPANSION_ADJUSTMENT; - } - - /* Add an entry to the symbol value adjust list. This is used - by bfd_ecoff_debug_accumulate to adjust the values of - internal symbols and FDR's. */ - amt = sizeof (struct ecoff_value_adjust); - adjust = (struct ecoff_value_adjust *) bfd_alloc (abfd, amt); - if (adjust == (struct ecoff_value_adjust *) NULL) - goto error_return; - - adjust->start = int_rel.r_vaddr; - adjust->end = sec->vma + sec->_raw_size; - adjust->adjust = PCREL16_EXPANSION_ADJUSTMENT; - - adjust->next = ecoff_data (abfd)->debug_info.adjust; - ecoff_data (abfd)->debug_info.adjust = adjust; - } - - if (contents != (bfd_byte *) NULL && ! info->keep_memory) - free (contents); - - return TRUE; - - error_return: - if (contents != (bfd_byte *) NULL && ! info->keep_memory) - free (contents); - return FALSE; -} - -/* This routine is called from mips_relocate_section when a PC - relative reloc must be expanded into the five instruction sequence. - It handles all the details of the expansion, including resolving - the reloc. */ - -static bfd_boolean -mips_relax_pcrel16 (info, input_bfd, input_section, h, location, address) - struct bfd_link_info *info ATTRIBUTE_UNUSED; - bfd *input_bfd; - asection *input_section ATTRIBUTE_UNUSED; - struct ecoff_link_hash_entry *h; - bfd_byte *location; - bfd_vma address; -{ - bfd_vma relocation; - - /* 0x0411ffff is bgezal $0,. == bal . */ - BFD_ASSERT (bfd_get_32 (input_bfd, location) == 0x0411ffff); - - /* We need to compute the distance between the symbol and the - current address plus eight. */ - relocation = (h->root.u.def.value - + h->root.u.def.section->output_section->vma - + h->root.u.def.section->output_offset); - relocation -= address + 8; - - /* If the lower half is negative, increment the upper 16 half. */ - if ((relocation & 0x8000) != 0) - relocation += 0x10000; - - bfd_put_32 (input_bfd, (bfd_vma) 0x04110001, location); /* bal .+8 */ - bfd_put_32 (input_bfd, - 0x3c010000 | ((relocation >> 16) & 0xffff), /* lui $at,XX */ - location + 4); - bfd_put_32 (input_bfd, - 0x24210000 | (relocation & 0xffff), /* addiu $at,$at,XX */ - location + 8); - bfd_put_32 (input_bfd, - (bfd_vma) 0x003f0821, location + 12); /* addu $at,$at,$ra */ - bfd_put_32 (input_bfd, - (bfd_vma) 0x0020f809, location + 16); /* jalr $at */ - - return TRUE; -} - /* This is the ECOFF backend structure. The backend field of the target vector points to this. */ @@ -2431,7 +1385,7 @@ static const struct ecoff_backend_data mips_ecoff_backend_data = _bfd_generic_get_section_contents_in_window /* Relaxing sections is MIPS specific. */ -#define _bfd_ecoff_bfd_relax_section mips_relax_section +#define _bfd_ecoff_bfd_relax_section bfd_generic_relax_section /* GC of sections is not done. */ #define _bfd_ecoff_bfd_gc_sections bfd_generic_gc_sections |