diff options
Diffstat (limited to 'bfd/mach-o.c')
| -rw-r--r-- | bfd/mach-o.c | 175 |
1 files changed, 99 insertions, 76 deletions
diff --git a/bfd/mach-o.c b/bfd/mach-o.c index b1bac05..bbd8d1e 100644 --- a/bfd/mach-o.c +++ b/bfd/mach-o.c @@ -1299,7 +1299,7 @@ bfd_mach_o_get_reloc_upper_bound (bfd *abfd ATTRIBUTE_UNUSED, /* In addition to the need to byte-swap the symbol number, the bit positions of the fields in the relocation information vary per target endian-ness. */ -static void +void bfd_mach_o_swap_in_non_scattered_reloc (bfd *abfd, bfd_mach_o_reloc_info *rel, unsigned char *fields) { @@ -1325,17 +1325,87 @@ bfd_mach_o_swap_in_non_scattered_reloc (bfd *abfd, bfd_mach_o_reloc_info *rel, } } -static int -bfd_mach_o_canonicalize_one_reloc (bfd *abfd, - struct mach_o_reloc_info_external *raw, - arelent *res, asymbol **syms) +/* Set syms_ptr_ptr and addend of RES. */ + +bfd_boolean +bfd_mach_o_canonicalize_non_scattered_reloc (bfd *abfd, + bfd_mach_o_reloc_info *reloc, + arelent *res, asymbol **syms) { bfd_mach_o_data_struct *mdata = bfd_mach_o_get_data (abfd); - bfd_mach_o_backend_data *bed = bfd_mach_o_get_backend_data (abfd); - bfd_mach_o_reloc_info reloc; - bfd_vma addr; + unsigned int num; asymbol **sym; + /* Non-scattered relocation. */ + reloc->r_scattered = 0; + res->addend = 0; + + num = reloc->r_value; + + if (reloc->r_extern) + { + /* PR 17512: file: 8396-1185-0.004. */ + if (num >= (unsigned) bfd_mach_o_count_symbols (abfd)) + sym = bfd_und_section_ptr->symbol_ptr_ptr; + else if (syms == NULL) + sym = bfd_und_section_ptr->symbol_ptr_ptr; + else + /* An external symbol number. */ + sym = syms + num; + } + else if (num == 0x00ffffff || num == 0) + { + /* The 'symnum' in a non-scattered PAIR is 0x00ffffff. But as this + is generic code, we don't know wether this is really a PAIR. + This value is almost certainly not a valid section number, hence + this specific case to avoid an assertion failure. + Target specific swap_reloc_in routine should adjust that. */ + sym = bfd_abs_section_ptr->symbol_ptr_ptr; + } + else + { + /* PR 17512: file: 006-2964-0.004. */ + if (num > mdata->nsects) + return FALSE; + + /* A section number. */ + sym = mdata->sections[num - 1]->bfdsection->symbol_ptr_ptr; + /* For a symbol defined in section S, the addend (stored in the + binary) contains the address of the section. To comply with + bfd convention, subtract the section address. + Use the address from the header, so that the user can modify + the vma of the section. */ + res->addend = -mdata->sections[num - 1]->addr; + } + + /* Note: Pairs for PPC LO/HI/HA are not scattered, but contain the offset + in the lower 16bits of the address value. So we have to find the + 'symbol' from the preceding reloc. We do this even though the + section symbol is probably not needed here, because NULL symbol + values cause an assert in generic BFD code. This must be done in + the PPC swap_reloc_in routine. */ + res->sym_ptr_ptr = sym; + + return TRUE; +} + +/* Do most of the work for canonicalize_relocs on RAW: create internal + representation RELOC and set most fields of RES using symbol table SYMS. + Each target still has to set the howto of RES and possibly adjust other + fields. + Previously the Mach-O hook point was simply swap_in, but some targets + (like arm64) don't follow the generic rules (symnum is a value for the + non-scattered relocation ADDEND). */ + +bfd_boolean +bfd_mach_o_pre_canonicalize_one_reloc (bfd *abfd, + struct mach_o_reloc_info_external *raw, + bfd_mach_o_reloc_info *reloc, + arelent *res, asymbol **syms) +{ + bfd_mach_o_data_struct *mdata = bfd_mach_o_get_data (abfd); + bfd_vma addr; + addr = bfd_get_32 (abfd, raw->r_address); res->sym_ptr_ptr = NULL; res->addend = 0; @@ -1346,11 +1416,11 @@ bfd_mach_o_canonicalize_one_reloc (bfd *abfd, bfd_vma symnum = bfd_get_32 (abfd, raw->r_symbolnum); /* Scattered relocation, can't be extern. */ - reloc.r_scattered = 1; - reloc.r_extern = 0; + reloc->r_scattered = 1; + reloc->r_extern = 0; /* Extract section and offset from r_value (symnum). */ - reloc.r_value = symnum; + reloc->r_value = symnum; /* FIXME: This breaks when a symbol in a reloc exactly follows the end of the data for the section (e.g. in a calculation of section data length). At present, the symbol will end up associated with @@ -1368,81 +1438,33 @@ bfd_mach_o_canonicalize_one_reloc (bfd *abfd, } /* Extract the info and address fields from r_address. */ - reloc.r_type = BFD_MACH_O_GET_SR_TYPE (addr); - reloc.r_length = BFD_MACH_O_GET_SR_LENGTH (addr); - reloc.r_pcrel = addr & BFD_MACH_O_SR_PCREL; - reloc.r_address = BFD_MACH_O_GET_SR_TYPE (addr); + reloc->r_type = BFD_MACH_O_GET_SR_TYPE (addr); + reloc->r_length = BFD_MACH_O_GET_SR_LENGTH (addr); + reloc->r_pcrel = addr & BFD_MACH_O_SR_PCREL; + reloc->r_address = BFD_MACH_O_GET_SR_TYPE (addr); res->address = BFD_MACH_O_GET_SR_ADDRESS (addr); } else { - unsigned int num; - /* Non-scattered relocation. */ - reloc.r_scattered = 0; + reloc->r_scattered = 0; + reloc->r_address = addr; + res->address = addr; /* The value and info fields have to be extracted dependent on target endian-ness. */ - bfd_mach_o_swap_in_non_scattered_reloc (abfd, &reloc, raw->r_symbolnum); - num = reloc.r_value; + bfd_mach_o_swap_in_non_scattered_reloc (abfd, reloc, raw->r_symbolnum); - if (reloc.r_extern) - { - /* PR 17512: file: 8396-1185-0.004. */ - if (num >= (unsigned) bfd_mach_o_count_symbols (abfd)) - sym = bfd_und_section_ptr->symbol_ptr_ptr; - else if (syms == NULL) - sym = bfd_und_section_ptr->symbol_ptr_ptr; - else - /* An external symbol number. */ - sym = syms + num; - } - else if (num == 0x00ffffff || num == 0) - { - /* The 'symnum' in a non-scattered PAIR is 0x00ffffff. But as this - is generic code, we don't know wether this is really a PAIR. - This value is almost certainly not a valid section number, hence - this specific case to avoid an assertion failure. - Target specific swap_reloc_in routine should adjust that. */ - sym = bfd_abs_section_ptr->symbol_ptr_ptr; - } - else - { - /* PR 17512: file: 006-2964-0.004. */ - if (num > mdata->nsects) - return -1; - - /* A section number. */ - sym = mdata->sections[num - 1]->bfdsection->symbol_ptr_ptr; - /* For a symbol defined in section S, the addend (stored in the - binary) contains the address of the section. To comply with - bfd convention, subtract the section address. - Use the address from the header, so that the user can modify - the vma of the section. */ - res->addend = -mdata->sections[num - 1]->addr; - } - /* Note: Pairs for PPC LO/HI/HA are not scattered, but contain the offset - in the lower 16bits of the address value. So we have to find the - 'symbol' from the preceding reloc. We do this even though the - section symbol is probably not needed here, because NULL symbol - values cause an assert in generic BFD code. This must be done in - the PPC swap_reloc_in routine. */ - res->sym_ptr_ptr = sym; - - /* The 'address' is just r_address. - ??? maybe this should be masked with 0xffffff for safety. */ - res->address = addr; - reloc.r_address = addr; + if (!bfd_mach_o_canonicalize_non_scattered_reloc (abfd, reloc, + res, syms)) + return FALSE; } /* We have set up a reloc with all the information present, so the swapper can modify address, value and addend fields, if necessary, to convey information in the generic BFD reloc that is mach-o specific. */ - if (!(*bed->_bfd_mach_o_swap_reloc_in)(res, &reloc)) - return -1; - - return 0; + return TRUE; } static int @@ -1450,6 +1472,7 @@ bfd_mach_o_canonicalize_relocs (bfd *abfd, unsigned long filepos, unsigned long count, arelent *res, asymbol **syms) { + bfd_mach_o_backend_data *bed = bfd_mach_o_get_backend_data (abfd); unsigned long i; struct mach_o_reloc_info_external *native_relocs; bfd_size_type native_size; @@ -1472,8 +1495,8 @@ bfd_mach_o_canonicalize_relocs (bfd *abfd, unsigned long filepos, for (i = 0; i < count; i++) { - if (bfd_mach_o_canonicalize_one_reloc (abfd, &native_relocs[i], - &res[i], syms) < 0) + if (!(*bed->_bfd_mach_o_canonicalize_one_reloc)(abfd, &native_relocs[i], + &res[i], syms)) goto err; } free (native_relocs); @@ -1495,7 +1518,7 @@ bfd_mach_o_canonicalize_reloc (bfd *abfd, asection *asect, return 0; /* No need to go further if we don't know how to read relocs. */ - if (bed->_bfd_mach_o_swap_reloc_in == NULL) + if (bed->_bfd_mach_o_canonicalize_one_reloc == NULL) return 0; if (asect->relocation == NULL) @@ -1550,7 +1573,7 @@ bfd_mach_o_canonicalize_dynamic_reloc (bfd *abfd, arelent **rels, return 0; /* No need to go further if we don't know how to read relocs. */ - if (bed->_bfd_mach_o_swap_reloc_in == NULL) + if (bed->_bfd_mach_o_canonicalize_one_reloc == NULL) return 0; if (mdata->dyn_reloc_cache == NULL) @@ -5807,7 +5830,7 @@ bfd_boolean bfd_mach_o_free_cached_info (bfd *abfd) #define bfd_mach_o_bfd_reloc_type_lookup _bfd_norelocs_bfd_reloc_type_lookup #define bfd_mach_o_bfd_reloc_name_lookup _bfd_norelocs_bfd_reloc_name_lookup -#define bfd_mach_o_swap_reloc_in NULL +#define bfd_mach_o_canonicalize_one_reloc NULL #define bfd_mach_o_swap_reloc_out NULL #define bfd_mach_o_print_thread NULL #define bfd_mach_o_tgt_seg_table NULL |