From: Jakub Jelinek Date: Tue, 21 Nov 2006 11:25:17 +0000 (+0000) Subject: * elf-eh-frame.c (struct cie): New type. X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=bce613b9bfac3b56f4f9742776db11aeec875300;p=binutils-gdb.git * elf-eh-frame.c (struct cie): New type. (cie_compare): Removed. (cie_eq, cie_hash, cie_compute_hash): New functions. (_bfd_elf_discard_section_eh_frame): Rewrite not to rely on FDEs pointing only to last CIE and allow merging of any duplicate CIEs, not just duplicate consecutive CIEs. (_bfd_elf_discard_section_eh_frame_hdr): Delete cies hash table. * elf-bfd.h (struct cie_header, struct cie): Removed. (struct eh_frame_sec_info): Remove alloced field. (struct eh_frame_hdr_info): Remove last_cie, last_cie_sec and last_cie_inf fields. Add cies field. * ld-elf/eh5.d: New test. * ld-elf/eh5.s: New file. * ld-elf/eh5a.s: New file. * ld-elf/eh5b.s: New file. --- diff --git a/bfd/ChangeLog b/bfd/ChangeLog index 382e2173670..c703067cad3 100644 --- a/bfd/ChangeLog +++ b/bfd/ChangeLog @@ -1,3 +1,17 @@ +2006-11-21 Jakub Jelinek + + * elf-eh-frame.c (struct cie): New type. + (cie_compare): Removed. + (cie_eq, cie_hash, cie_compute_hash): New functions. + (_bfd_elf_discard_section_eh_frame): Rewrite not to rely on FDEs + pointing only to last CIE and allow merging of any duplicate CIEs, + not just duplicate consecutive CIEs. + (_bfd_elf_discard_section_eh_frame_hdr): Delete cies hash table. + * elf-bfd.h (struct cie_header, struct cie): Removed. + (struct eh_frame_sec_info): Remove alloced field. + (struct eh_frame_hdr_info): Remove last_cie, last_cie_sec + and last_cie_inf fields. Add cies field. + 2006-11-20 Alan Modra * bfd-in.h (struct stat): Don't typedef. diff --git a/bfd/elf-bfd.h b/bfd/elf-bfd.h index 4a7c0c817bd..80aa23e2f22 100644 --- a/bfd/elf-bfd.h +++ b/bfd/elf-bfd.h @@ -261,31 +261,6 @@ struct elf_link_loaded_list }; /* Structures used by the eh_frame optimization code. */ -struct cie_header -{ - unsigned int length; - unsigned int id; -}; - -struct cie -{ - struct cie_header hdr; - unsigned char version; - char augmentation[20]; - bfd_vma code_align; - bfd_signed_vma data_align; - bfd_vma ra_column; - bfd_vma augmentation_size; - struct elf_link_hash_entry *personality; - unsigned char per_encoding; - unsigned char lsda_encoding; - unsigned char fde_encoding; - unsigned char initial_insn_length; - unsigned char make_relative; - unsigned char make_lsda_relative; - unsigned char initial_instructions[50]; -}; - struct eh_cie_fde { /* For FDEs, this points to the CIE used. */ @@ -310,7 +285,6 @@ struct eh_cie_fde struct eh_frame_sec_info { unsigned int count; - unsigned int alloced; struct eh_cie_fde entry[1]; }; @@ -320,11 +294,11 @@ struct eh_frame_array_ent bfd_vma fde; }; +struct htab; + struct eh_frame_hdr_info { - struct cie last_cie; - asection *last_cie_sec; - struct eh_cie_fde *last_cie_inf; + struct htab *cies; asection *hdr_sec; unsigned int fde_count, array_count; struct eh_frame_array_ent *array; diff --git a/bfd/elf-eh-frame.c b/bfd/elf-eh-frame.c index 859f534b158..2aa61e14e21 100644 --- a/bfd/elf-eh-frame.c +++ b/bfd/elf-eh-frame.c @@ -26,6 +26,30 @@ #define EH_FRAME_HDR_SIZE 8 +struct cie +{ + unsigned int length; + unsigned int hash; + unsigned char version; + char augmentation[20]; + bfd_vma code_align; + bfd_signed_vma data_align; + bfd_vma ra_column; + bfd_vma augmentation_size; + struct elf_link_hash_entry *personality; + asection *output_sec; + struct eh_cie_fde *cie_inf; + unsigned char per_encoding; + unsigned char lsda_encoding; + unsigned char fde_encoding; + unsigned char initial_insn_length; + unsigned char make_relative; + unsigned char make_lsda_relative; + unsigned char initial_instructions[50]; +}; + + + /* If *ITER hasn't reached END yet, read the next byte into *RESULT and move onto the next byte. Return true on success. */ @@ -180,12 +204,16 @@ write_value (bfd *abfd, bfd_byte *buf, bfd_vma value, int width) } } -/* Return zero if C1 and C2 CIEs can be merged. */ +/* Return one if C1 and C2 CIEs can be merged. */ -static -int cie_compare (struct cie *c1, struct cie *c2) +static int +cie_eq (const void *e1, const void *e2) { - if (c1->hdr.length == c2->hdr.length + const struct cie *c1 = e1; + const struct cie *c2 = e2; + + if (c1->hash == c2->hash + && c1->length == c2->length && c1->version == c2->version && strcmp (c1->augmentation, c2->augmentation) == 0 && strcmp (c1->augmentation, "eh") != 0 @@ -194,6 +222,7 @@ int cie_compare (struct cie *c1, struct cie *c2) && c1->ra_column == c2->ra_column && c1->augmentation_size == c2->augmentation_size && c1->personality == c2->personality + && c1->output_sec == c2->output_sec && c1->per_encoding == c2->per_encoding && c1->lsda_encoding == c2->lsda_encoding && c1->fde_encoding == c2->fde_encoding @@ -201,9 +230,38 @@ int cie_compare (struct cie *c1, struct cie *c2) && memcmp (c1->initial_instructions, c2->initial_instructions, c1->initial_insn_length) == 0) - return 0; + return 1; - return 1; + return 0; +} + +static hashval_t +cie_hash (const void *e) +{ + const struct cie *c = e; + return c->hash; +} + +static hashval_t +cie_compute_hash (struct cie *c) +{ + hashval_t h = 0; + h = iterative_hash_object (c->length, h); + h = iterative_hash_object (c->version, h); + h = iterative_hash (c->augmentation, strlen (c->augmentation) + 1, h); + h = iterative_hash_object (c->code_align, h); + h = iterative_hash_object (c->data_align, h); + h = iterative_hash_object (c->ra_column, h); + h = iterative_hash_object (c->augmentation_size, h); + h = iterative_hash_object (c->personality, h); + h = iterative_hash_object (c->output_sec, h); + h = iterative_hash_object (c->per_encoding, h); + h = iterative_hash_object (c->lsda_encoding, h); + h = iterative_hash_object (c->fde_encoding, h); + h = iterative_hash_object (c->initial_insn_length, h); + h = iterative_hash (c->initial_instructions, c->initial_insn_length, h); + c->hash = h; + return h; } /* Return the number of extra bytes that we'll be inserting into @@ -383,15 +441,24 @@ _bfd_elf_discard_section_eh_frame while (0) bfd_byte *ehbuf = NULL, *buf; - bfd_byte *last_cie, *last_fde; - struct eh_cie_fde *ent, *last_cie_inf, *this_inf; - struct cie_header hdr; - struct cie cie; + bfd_byte *last_fde; + struct eh_cie_fde *ent, *this_inf; + unsigned int hdr_length, hdr_id; + struct extended_cie + { + struct cie cie; + unsigned int offset; + unsigned int usage_count; + unsigned int entry; + } *ecies = NULL, *ecie; + unsigned int ecie_count = 0, ecie_alloced = 0; + struct cie *cie; struct elf_link_hash_table *htab; struct eh_frame_hdr_info *hdr_info; struct eh_frame_sec_info *sec_info = NULL; - unsigned int cie_usage_count, offset; + unsigned int offset; unsigned int ptr_size; + unsigned int entry_alloced; if (sec->size == 0) { @@ -409,6 +476,9 @@ _bfd_elf_discard_section_eh_frame htab = elf_hash_table (info); hdr_info = &htab->eh_info; + if (hdr_info->cies == NULL && !info->relocatable) + hdr_info->cies = htab_try_create (1, cie_hash, cie_eq, free); + /* Read the frame unwind information from abfd. */ REQUIRE (bfd_malloc_and_get_section (abfd, sec, &ehbuf)); @@ -431,15 +501,11 @@ _bfd_elf_discard_section_eh_frame REQUIRE (ptr_size != 0); buf = ehbuf; - last_cie = NULL; - last_cie_inf = NULL; - memset (&cie, 0, sizeof (cie)); - cie_usage_count = 0; sec_info = bfd_zmalloc (sizeof (struct eh_frame_sec_info) + 99 * sizeof (struct eh_cie_fde)); REQUIRE (sec_info); - sec_info->alloced = 100; + entry_alloced = 100; #define ENSURE_NO_RELOCS(buf) \ REQUIRE (!(cookie->rel < cookie->relend \ @@ -466,116 +532,80 @@ _bfd_elf_discard_section_eh_frame bfd_size_type length; unsigned int set_loc_count; - if (sec_info->count == sec_info->alloced) + if (sec_info->count == entry_alloced) { - struct eh_cie_fde *old_entry = sec_info->entry; sec_info = bfd_realloc (sec_info, sizeof (struct eh_frame_sec_info) - + ((sec_info->alloced + 99) + + ((entry_alloced + 99) * sizeof (struct eh_cie_fde))); REQUIRE (sec_info); - memset (&sec_info->entry[sec_info->alloced], 0, + memset (&sec_info->entry[entry_alloced], 0, 100 * sizeof (struct eh_cie_fde)); - sec_info->alloced += 100; - - /* Now fix any pointers into the array. */ - if (last_cie_inf >= old_entry - && last_cie_inf < old_entry + sec_info->count) - last_cie_inf = sec_info->entry + (last_cie_inf - old_entry); + entry_alloced += 100; } this_inf = sec_info->entry + sec_info->count; last_fde = buf; - /* If we are at the end of the section, we still need to decide - on whether to output or discard last encountered CIE (if any). */ + if ((bfd_size_type) (buf - ehbuf) == sec->size) - { - hdr.length = 0; - hdr.id = (unsigned int) -1; - end = buf; - } - else - { - /* Read the length of the entry. */ - REQUIRE (skip_bytes (&buf, ehbuf + sec->size, 4)); - hdr.length = bfd_get_32 (abfd, buf - 4); + break; - /* 64-bit .eh_frame is not supported. */ - REQUIRE (hdr.length != 0xffffffff); + /* Read the length of the entry. */ + REQUIRE (skip_bytes (&buf, ehbuf + sec->size, 4)); + hdr_length = bfd_get_32 (abfd, buf - 4); - /* The CIE/FDE must be fully contained in this input section. */ - REQUIRE ((bfd_size_type) (buf - ehbuf) + hdr.length <= sec->size); - end = buf + hdr.length; + /* 64-bit .eh_frame is not supported. */ + REQUIRE (hdr_length != 0xffffffff); - this_inf->offset = last_fde - ehbuf; - this_inf->size = 4 + hdr.length; + /* The CIE/FDE must be fully contained in this input section. */ + REQUIRE ((bfd_size_type) (buf - ehbuf) + hdr_length <= sec->size); + end = buf + hdr_length; - if (hdr.length == 0) - { - /* A zero-length CIE should only be found at the end of - the section. */ - REQUIRE ((bfd_size_type) (buf - ehbuf) == sec->size); - ENSURE_NO_RELOCS (buf); - sec_info->count++; - /* Now just finish last encountered CIE processing and break - the loop. */ - hdr.id = (unsigned int) -1; - } - else - { - REQUIRE (skip_bytes (&buf, end, 4)); - hdr.id = bfd_get_32 (abfd, buf - 4); - REQUIRE (hdr.id != (unsigned int) -1); - } + this_inf->offset = last_fde - ehbuf; + this_inf->size = 4 + hdr_length; + + if (hdr_length == 0) + { + /* A zero-length CIE should only be found at the end of + the section. */ + REQUIRE ((bfd_size_type) (buf - ehbuf) == sec->size); + ENSURE_NO_RELOCS (buf); + sec_info->count++; + break; } - if (hdr.id == 0 || hdr.id == (unsigned int) -1) + REQUIRE (skip_bytes (&buf, end, 4)); + hdr_id = bfd_get_32 (abfd, buf - 4); + + if (hdr_id == 0) { unsigned int initial_insn_length; /* CIE */ - if (last_cie != NULL) + this_inf->cie = 1; + + if (ecie_count == ecie_alloced) { - /* Now check if this CIE is identical to the last CIE, - in which case we can remove it provided we adjust - all FDEs. Also, it can be removed if we have removed - all FDEs using it. */ - if ((!info->relocatable - && hdr_info->last_cie_sec - && (sec->output_section - == hdr_info->last_cie_sec->output_section) - && cie_compare (&cie, &hdr_info->last_cie) == 0) - || cie_usage_count == 0) - last_cie_inf->removed = 1; - else - { - hdr_info->last_cie = cie; - hdr_info->last_cie_sec = sec; - last_cie_inf->make_relative = cie.make_relative; - last_cie_inf->make_lsda_relative = cie.make_lsda_relative; - last_cie_inf->per_encoding_relative - = (cie.per_encoding & 0x70) == DW_EH_PE_pcrel; - } + ecies = bfd_realloc (ecies, + (ecie_alloced + 20) * sizeof (*ecies)); + REQUIRE (ecies); + memset (&ecies[ecie_alloced], 0, 20 * sizeof (*ecies)); + ecie_alloced += 20; } - if (hdr.id == (unsigned int) -1) - break; - - last_cie_inf = this_inf; - this_inf->cie = 1; - - cie_usage_count = 0; - memset (&cie, 0, sizeof (cie)); - cie.hdr = hdr; + cie = &ecies[ecie_count].cie; + ecies[ecie_count].offset = this_inf->offset; + ecies[ecie_count++].entry = sec_info->count; + cie->length = hdr_length; start = buf; - REQUIRE (read_byte (&buf, end, &cie.version)); + REQUIRE (read_byte (&buf, end, &cie->version)); /* Cannot handle unknown versions. */ - REQUIRE (cie.version == 1 || cie.version == 3); - REQUIRE (strlen ((char *) buf) < sizeof (cie.augmentation)); + REQUIRE (cie->version == 1 || cie->version == 3); + REQUIRE (strlen ((char *) buf) < sizeof (cie->augmentation)); - strcpy (cie.augmentation, (char *) buf); + strcpy (cie->augmentation, (char *) buf); buf = (bfd_byte *) strchr ((char *) buf, '\0') + 1; ENSURE_NO_RELOCS (buf); if (buf[0] == 'e' && buf[1] == 'h') @@ -587,26 +617,26 @@ _bfd_elf_discard_section_eh_frame REQUIRE (skip_bytes (&buf, end, ptr_size)); SKIP_RELOCS (buf); } - REQUIRE (read_uleb128 (&buf, end, &cie.code_align)); - REQUIRE (read_sleb128 (&buf, end, &cie.data_align)); - if (cie.version == 1) + REQUIRE (read_uleb128 (&buf, end, &cie->code_align)); + REQUIRE (read_sleb128 (&buf, end, &cie->data_align)); + if (cie->version == 1) { REQUIRE (buf < end); - cie.ra_column = *buf++; + cie->ra_column = *buf++; } else - REQUIRE (read_uleb128 (&buf, end, &cie.ra_column)); + REQUIRE (read_uleb128 (&buf, end, &cie->ra_column)); ENSURE_NO_RELOCS (buf); - cie.lsda_encoding = DW_EH_PE_omit; - cie.fde_encoding = DW_EH_PE_omit; - cie.per_encoding = DW_EH_PE_omit; - aug = cie.augmentation; + cie->lsda_encoding = DW_EH_PE_omit; + cie->fde_encoding = DW_EH_PE_omit; + cie->per_encoding = DW_EH_PE_omit; + aug = cie->augmentation; if (aug[0] != 'e' || aug[1] != 'h') { if (*aug == 'z') { aug++; - REQUIRE (read_uleb128 (&buf, end, &cie.augmentation_size)); + REQUIRE (read_uleb128 (&buf, end, &cie->augmentation_size)); ENSURE_NO_RELOCS (buf); } @@ -614,14 +644,14 @@ _bfd_elf_discard_section_eh_frame switch (*aug++) { case 'L': - REQUIRE (read_byte (&buf, end, &cie.lsda_encoding)); + REQUIRE (read_byte (&buf, end, &cie->lsda_encoding)); ENSURE_NO_RELOCS (buf); - REQUIRE (get_DW_EH_PE_width (cie.lsda_encoding, ptr_size)); + REQUIRE (get_DW_EH_PE_width (cie->lsda_encoding, ptr_size)); break; case 'R': - REQUIRE (read_byte (&buf, end, &cie.fde_encoding)); + REQUIRE (read_byte (&buf, end, &cie->fde_encoding)); ENSURE_NO_RELOCS (buf); - REQUIRE (get_DW_EH_PE_width (cie.fde_encoding, ptr_size)); + REQUIRE (get_DW_EH_PE_width (cie->fde_encoding, ptr_size)); break; case 'S': break; @@ -629,11 +659,11 @@ _bfd_elf_discard_section_eh_frame { int per_width; - REQUIRE (read_byte (&buf, end, &cie.per_encoding)); - per_width = get_DW_EH_PE_width (cie.per_encoding, + REQUIRE (read_byte (&buf, end, &cie->per_encoding)); + per_width = get_DW_EH_PE_width (cie->per_encoding, ptr_size); REQUIRE (per_width); - if ((cie.per_encoding & 0xf0) == DW_EH_PE_aligned) + if ((cie->per_encoding & 0xf0) == DW_EH_PE_aligned) { length = -(buf - ehbuf) & (per_width - 1); REQUIRE (skip_bytes (&buf, end, length)); @@ -663,7 +693,7 @@ _bfd_elf_discard_section_eh_frame h = (struct elf_link_hash_entry *) h->root.u.i.link; - cie.personality = h; + cie->personality = h; } /* Cope with MIPS-style composite relocations. */ do @@ -671,6 +701,7 @@ _bfd_elf_discard_section_eh_frame while (GET_RELOC (buf) != NULL); } REQUIRE (skip_bytes (&buf, end, per_width)); + REQUIRE (cie->personality); } break; default: @@ -686,18 +717,18 @@ _bfd_elf_discard_section_eh_frame ->elf_backend_can_make_relative_eh_frame (abfd, info, sec))) { - if ((cie.fde_encoding & 0xf0) == DW_EH_PE_absptr) - cie.make_relative = 1; + if ((cie->fde_encoding & 0xf0) == DW_EH_PE_absptr) + cie->make_relative = 1; /* If the CIE doesn't already have an 'R' entry, it's fairly easy to add one, provided that there's no aligned data after the augmentation string. */ - else if (cie.fde_encoding == DW_EH_PE_omit - && (cie.per_encoding & 0xf0) != DW_EH_PE_aligned) + else if (cie->fde_encoding == DW_EH_PE_omit + && (cie->per_encoding & 0xf0) != DW_EH_PE_aligned) { - if (*cie.augmentation == 0) + if (*cie->augmentation == 0) this_inf->add_augmentation_size = 1; this_inf->add_fde_encoding = 1; - cie.make_relative = 1; + cie->make_relative = 1; } } @@ -705,30 +736,36 @@ _bfd_elf_discard_section_eh_frame && (get_elf_backend_data (abfd) ->elf_backend_can_make_lsda_relative_eh_frame (abfd, info, sec)) - && (cie.lsda_encoding & 0xf0) == DW_EH_PE_absptr) - cie.make_lsda_relative = 1; + && (cie->lsda_encoding & 0xf0) == DW_EH_PE_absptr) + cie->make_lsda_relative = 1; /* If FDE encoding was not specified, it defaults to DW_EH_absptr. */ - if (cie.fde_encoding == DW_EH_PE_omit) - cie.fde_encoding = DW_EH_PE_absptr; + if (cie->fde_encoding == DW_EH_PE_omit) + cie->fde_encoding = DW_EH_PE_absptr; initial_insn_length = end - buf; - if (initial_insn_length <= 50) + if (initial_insn_length <= sizeof (cie->initial_instructions)) { - cie.initial_insn_length = initial_insn_length; - memcpy (cie.initial_instructions, buf, initial_insn_length); + cie->initial_insn_length = initial_insn_length; + memcpy (cie->initial_instructions, buf, initial_insn_length); } insns = buf; buf += initial_insn_length; ENSURE_NO_RELOCS (buf); - last_cie = last_fde; } else { - /* Ensure this FDE uses the last CIE encountered. */ - REQUIRE (last_cie); - REQUIRE (hdr.id == (unsigned int) (buf - 4 - last_cie)); + /* Find the corresponding CIE. */ + unsigned int cie_offset = this_inf->offset + 4 - hdr_id; + for (ecie = ecies; ecie < ecies + ecie_count; ++ecie) + if (cie_offset == ecie->offset) + break; + + /* Ensure this FDE references one of the CIEs in this input + section. */ + REQUIRE (ecie != ecies + ecie_count); + cie = &ecie->cie; ENSURE_NO_RELOCS (buf); REQUIRE (GET_RELOC (buf)); @@ -740,9 +777,9 @@ _bfd_elf_discard_section_eh_frame else { if (info->shared - && (((cie.fde_encoding & 0xf0) == DW_EH_PE_absptr - && cie.make_relative == 0) - || (cie.fde_encoding & 0xf0) == DW_EH_PE_aligned)) + && (((cie->fde_encoding & 0xf0) == DW_EH_PE_absptr + && cie->make_relative == 0) + || (cie->fde_encoding & 0xf0) == DW_EH_PE_aligned)) { /* If a shared library uses absolute pointers which we cannot turn into PC relative, @@ -750,16 +787,18 @@ _bfd_elf_discard_section_eh_frame since it is affected by runtime relocations. */ hdr_info->table = FALSE; } - cie_usage_count++; + ecie->usage_count++; hdr_info->fde_count++; + this_inf->cie_inf = (void *) (ecie - ecies); } + /* Skip the initial location and address range. */ start = buf; - length = get_DW_EH_PE_width (cie.fde_encoding, ptr_size); + length = get_DW_EH_PE_width (cie->fde_encoding, ptr_size); REQUIRE (skip_bytes (&buf, end, 2 * length)); /* Skip the augmentation size, if present. */ - if (cie.augmentation[0] == 'z') + if (cie->augmentation[0] == 'z') REQUIRE (read_uleb128 (&buf, end, &length)); else length = 0; @@ -767,12 +806,12 @@ _bfd_elf_discard_section_eh_frame /* Of the supported augmentation characters above, only 'L' adds augmentation data to the FDE. This code would need to be adjusted if any future augmentations do the same thing. */ - if (cie.lsda_encoding != DW_EH_PE_omit) + if (cie->lsda_encoding != DW_EH_PE_omit) { this_inf->lsda_offset = buf - start; /* If there's no 'z' augmentation, we don't know where the CFA insns begin. Assume no padding. */ - if (cie.augmentation[0] != 'z') + if (cie->augmentation[0] != 'z') length = end - buf; } @@ -780,14 +819,14 @@ _bfd_elf_discard_section_eh_frame REQUIRE (skip_bytes (&buf, end, length)); insns = buf; - buf = last_fde + 4 + hdr.length; + buf = last_fde + 4 + hdr_length; SKIP_RELOCS (buf); } /* Try to interpret the CFA instructions and find the first padding nop. Shrink this_inf's size so that it doesn't include the padding. */ - length = get_DW_EH_PE_width (cie.fde_encoding, ptr_size); + length = get_DW_EH_PE_width (cie->fde_encoding, ptr_size); set_loc_count = 0; insns_end = skip_non_nops (insns, end, length, &set_loc_count); /* If we don't understand the CFA instructions, we can't know @@ -798,9 +837,14 @@ _bfd_elf_discard_section_eh_frame || (set_loc_count && this_inf->cie)) goto free_no_table; this_inf->size -= end - insns_end; + if (insns_end != end && this_inf->cie) + { + cie->initial_insn_length -= end - insns_end; + cie->length -= end - insns_end; + } if (set_loc_count - && ((cie.fde_encoding & 0xf0) == DW_EH_PE_pcrel - || cie.make_relative)) + && ((cie->fde_encoding & 0xf0) == DW_EH_PE_pcrel + || cie->make_relative)) { unsigned int cnt; bfd_byte *p; @@ -819,28 +863,66 @@ _bfd_elf_discard_section_eh_frame } } - this_inf->fde_encoding = cie.fde_encoding; - this_inf->lsda_encoding = cie.lsda_encoding; + this_inf->fde_encoding = cie->fde_encoding; + this_inf->lsda_encoding = cie->lsda_encoding; sec_info->count++; } elf_section_data (sec)->sec_info = sec_info; sec->sec_info_type = ELF_INFO_TYPE_EH_FRAME; + /* Look at all CIEs in this section and determine which can be + removed as unused, which can be merged with previous duplicate + CIEs and which need to be kept. */ + for (ecie = ecies; ecie < ecies + ecie_count; ++ecie) + { + if (ecie->usage_count == 0) + { + sec_info->entry[ecie->entry].removed = 1; + continue; + } + ecie->cie.output_sec = sec->output_section; + ecie->cie.cie_inf = sec_info->entry + ecie->entry; + cie_compute_hash (&ecie->cie); + if (hdr_info->cies != NULL) + { + void **loc = htab_find_slot_with_hash (hdr_info->cies, &ecie->cie, + ecie->cie.hash, INSERT); + if (loc != NULL) + { + if (*loc != HTAB_EMPTY_ENTRY) + { + sec_info->entry[ecie->entry].removed = 1; + ecie->cie.cie_inf = ((struct cie *) *loc)->cie_inf; + continue; + } + + *loc = malloc (sizeof (struct cie)); + if (*loc == NULL) + *loc = HTAB_DELETED_ENTRY; + else + memcpy (*loc, &ecie->cie, sizeof (struct cie)); + } + } + ecie->cie.cie_inf->make_relative = ecie->cie.make_relative; + ecie->cie.cie_inf->make_lsda_relative = ecie->cie.make_lsda_relative; + ecie->cie.cie_inf->per_encoding_relative + = (ecie->cie.per_encoding & 0x70) == DW_EH_PE_pcrel; + } + /* Ok, now we can assign new offsets. */ offset = 0; - last_cie_inf = hdr_info->last_cie_inf; for (ent = sec_info->entry; ent < sec_info->entry + sec_info->count; ++ent) if (!ent->removed) { - if (ent->cie) - last_cie_inf = ent; - else - ent->cie_inf = last_cie_inf; + if (!ent->cie) + { + ecie = ecies + (unsigned long) ent->cie_inf; + ent->cie_inf = ecie->cie.cie_inf; + } ent->new_offset = offset; offset += size_of_output_cie_fde (ent, ptr_size); } - hdr_info->last_cie_inf = last_cie_inf; /* Resize the sec as needed. */ sec->rawsize = sec->size; @@ -849,6 +931,8 @@ _bfd_elf_discard_section_eh_frame sec->flags |= SEC_EXCLUDE; free (ehbuf); + if (ecies) + free (ecies); return offset != sec->rawsize; free_no_table: @@ -856,8 +940,9 @@ free_no_table: free (ehbuf); if (sec_info) free (sec_info); + if (ecies) + free (ecies); hdr_info->table = FALSE; - hdr_info->last_cie.hdr.length = 0; return FALSE; #undef REQUIRE @@ -876,6 +961,13 @@ _bfd_elf_discard_section_eh_frame_hdr (bfd *abfd, struct bfd_link_info *info) htab = elf_hash_table (info); hdr_info = &htab->eh_info; + + if (hdr_info->cies != NULL) + { + htab_delete (hdr_info->cies); + hdr_info->cies = NULL; + } + sec = hdr_info->hdr_sec; if (sec == NULL) return FALSE; diff --git a/ld/testsuite/ChangeLog b/ld/testsuite/ChangeLog index ed48677e469..9b0a20fec90 100644 --- a/ld/testsuite/ChangeLog +++ b/ld/testsuite/ChangeLog @@ -1,3 +1,10 @@ +2006-11-21 Jakub Jelinek + + * ld-elf/eh5.d: New test. + * ld-elf/eh5.s: New file. + * ld-elf/eh5a.s: New file. + * ld-elf/eh5b.s: New file. + 2006-11-13 Daniel Jacobowitz * ld-arm/arm-dyn.ld, ld-arm/arm-lib.ld: Remove .stack. diff --git a/ld/testsuite/ld-elf/eh5.d b/ld/testsuite/ld-elf/eh5.d new file mode 100644 index 00000000000..c12562aa3b3 --- /dev/null +++ b/ld/testsuite/ld-elf/eh5.d @@ -0,0 +1,161 @@ +#source: eh5.s +#source: eh5a.s +#source: eh5b.s +#ld: +#readelf: -wf +#target: x86_64-*-* i?86-*-* + +The section .eh_frame contains: + +00000000 0000001[04] 00000000 CIE + Version: 1 + Augmentation: "zR" + Code alignment factor: 1 + Data alignment factor: .* + Return address column: .* + Augmentation data: 1b + + DW_CFA_nop + DW_CFA_nop + DW_CFA_nop +#... +0000001[48] 00000014 0000001[8c] FDE cie=00000000 pc=.* + DW_CFA_advance_loc: 4 to .* + DW_CFA_def_cfa: r0 ofs 16 + DW_CFA_nop + DW_CFA_nop + DW_CFA_nop + +000000(2c|30) 00000014 00000000 CIE + Version: 1 + Augmentation: "zPR" + Code alignment factor: 1 + Data alignment factor: .* + Return address column: .* + Augmentation data: 03 .. .. .. .. 1b + + DW_CFA_nop + +0000004[48] 00000014 0000001c FDE cie=000000(2c|30) pc=.* + DW_CFA_advance_loc: 4 to .* + DW_CFA_def_cfa: r0 ofs 16 + DW_CFA_nop + DW_CFA_nop + DW_CFA_nop + +000000(5c|60) 00000014 0000006[04] FDE cie=00000000 pc=.* + DW_CFA_advance_loc: 4 to .* + DW_CFA_def_cfa: r0 ofs 16 + DW_CFA_nop + DW_CFA_nop + DW_CFA_nop + +0000007[48] 0000001[8c] 00000000 CIE + Version: 1 + Augmentation: "zPLR" + Code alignment factor: 1 + Data alignment factor: .* + Return address column: .* + Augmentation data: 03 .. .. .. .. 0c 1b + + DW_CFA_nop + DW_CFA_nop + DW_CFA_nop +#... +0000009[08] 0000001c 0000002[04] FDE cie=0000007[48] pc=.* + Augmentation data: (ef be ad de 00 00 00 00|00 00 00 00 de ad be ef) + + DW_CFA_advance_loc: 4 to .* + DW_CFA_def_cfa: r0 ofs 16 + DW_CFA_nop + DW_CFA_nop + DW_CFA_nop + +000000b[08] 0000001[04] 00000000 CIE + Version: 1 + Augmentation: "zR" + Code alignment factor: 1 + Data alignment factor: .* + Return address column: .* + Augmentation data: 1b + + DW_CFA_def_cfa: r0 ofs 16 +#... +000000(c4|d0) 0000001[04] 0000001[8c] FDE cie=000000b[08] pc=.* + DW_CFA_nop + DW_CFA_nop + DW_CFA_nop +#... +000000[de]8 00000014 00000000 CIE + Version: 1 + Augmentation: "zPR" + Code alignment factor: 1 + Data alignment factor: .* + Return address column: .* + Augmentation data: 03 .. .. .. .. 1b + + DW_CFA_nop + +00000(0f|10)0 00000014 0000001c FDE cie=000000[de]8 pc=.* + DW_CFA_advance_loc: 4 to .* + DW_CFA_def_cfa: r0 ofs 16 + DW_CFA_nop + DW_CFA_nop + DW_CFA_nop + +000001[01]8 0000001[04] 000000(5c|64) FDE cie=000000b[08] pc=.* + DW_CFA_nop + DW_CFA_nop + DW_CFA_nop +#... +000001(1c|30) 0000001[8c] 00000000 CIE + Version: 1 + Augmentation: "zPLR" + Code alignment factor: 1 + Data alignment factor: .* + Return address column: .* + Augmentation data: 03 .. .. .. .. 0c 1b + + DW_CFA_nop + DW_CFA_nop + DW_CFA_nop +#... +000001(38|50) 0000001c 0000002[04] FDE cie=000001(1c|30) pc=.* + Augmentation data: (ef be ad de 00 00 00 00|00 00 00 00 de ad be ef) + + DW_CFA_advance_loc: 4 to .* + DW_CFA_def_cfa: r0 ofs 16 + DW_CFA_nop + DW_CFA_nop + DW_CFA_nop + +000001(58|70) 00000014 000001(5c|74) FDE cie=00000000 pc=.* + DW_CFA_advance_loc: 4 to .* + DW_CFA_def_cfa: r0 ofs 16 + DW_CFA_nop + DW_CFA_nop + DW_CFA_nop + +000001(70|88) 00000014 000001(48|5c) FDE cie=000000(2c|30) pc=.* + DW_CFA_advance_loc: 4 to .* + DW_CFA_def_cfa: r0 ofs 16 + DW_CFA_nop + DW_CFA_nop + DW_CFA_nop + +000001(88|a0) 00000014 000001(8c|a4) FDE cie=00000000 pc=.* + DW_CFA_advance_loc: 4 to .* + DW_CFA_def_cfa: r0 ofs 16 + DW_CFA_nop + DW_CFA_nop + DW_CFA_nop + +000001(a0|b8) 0000001c 000001(30|44) FDE cie=0000007[48] pc=.* + Augmentation data: (ef be ad de 00 00 00 00|00 00 00 00 de ad be ef) + + DW_CFA_advance_loc: 4 to .* + DW_CFA_def_cfa: r0 ofs 16 + DW_CFA_nop + DW_CFA_nop + DW_CFA_nop + diff --git a/ld/testsuite/ld-elf/eh5.s b/ld/testsuite/ld-elf/eh5.s new file mode 100644 index 00000000000..6af48c2c1ad --- /dev/null +++ b/ld/testsuite/ld-elf/eh5.s @@ -0,0 +1,29 @@ + .text + .cfi_startproc simple + .long 0 + .cfi_def_cfa 0, 16 + .long 0 + .cfi_endproc + + .cfi_startproc simple + .cfi_personality 3, my_personality_v0 + .long 0 + .cfi_def_cfa 0, 16 + .cfi_endproc + + .cfi_startproc simple + .long 0 + .cfi_def_cfa 0, 16 + .long 0 + .cfi_endproc + + .cfi_startproc simple + .cfi_personality 3, my_personality_v0 + .cfi_lsda 12, 0xdeadbeef + .long 0 + .cfi_def_cfa 0, 16 + .cfi_endproc + + .globl my_personality_v0 +my_personality_v0: + .long 0 diff --git a/ld/testsuite/ld-elf/eh5a.s b/ld/testsuite/ld-elf/eh5a.s new file mode 100644 index 00000000000..a74b2cc8432 --- /dev/null +++ b/ld/testsuite/ld-elf/eh5a.s @@ -0,0 +1,27 @@ + .text + .cfi_startproc simple + .cfi_def_cfa 0, 16 + .long 0 + .cfi_endproc + + .cfi_startproc simple + .cfi_personality 3, my_personality_v1 + .long 0 + .cfi_def_cfa 0, 16 + .cfi_endproc + + .cfi_startproc simple + .cfi_def_cfa 0, 16 + .long 0 + .cfi_endproc + + .cfi_startproc simple + .cfi_personality 3, my_personality_v1 + .cfi_lsda 12, 0xdeadbeef + .long 0 + .cfi_def_cfa 0, 16 + .cfi_endproc + + .globl my_personality_v1 +my_personality_v1: + .long 0 diff --git a/ld/testsuite/ld-elf/eh5b.s b/ld/testsuite/ld-elf/eh5b.s new file mode 100644 index 00000000000..3e5e0108f95 --- /dev/null +++ b/ld/testsuite/ld-elf/eh5b.s @@ -0,0 +1,29 @@ + .text + .cfi_startproc simple + .long 0 + .cfi_def_cfa 0, 16 + .long 0 + .cfi_endproc + + .cfi_startproc simple + .cfi_personality 3, my_personality_v0 + .long 0 + .cfi_def_cfa 0, 16 + .cfi_endproc + + .cfi_startproc simple + .long 0 + .cfi_def_cfa 0, 16 + .long 0 + .cfi_endproc + + .cfi_startproc simple + .cfi_personality 3, my_personality_v0 + .cfi_lsda 12, 0xdeadbeef + .long 0 + .cfi_def_cfa 0, 16 + .cfi_endproc + + .globl _start +_start: + .long 0