From: Alan Modra Date: Thu, 24 Apr 2014 12:29:56 +0000 (+0930) Subject: PR16867, linking object with separate debug file X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=93ee1e3683a12f4774b8beb4f821910982e21ce2;p=binutils-gdb.git PR16867, linking object with separate debug file This teaches the DWARF2 find_line functions how to deal with separate debug relocatable object files. Also fixes a major bug: When _bfd_dwarf2_slurp_debug_info was split out, place_sections ran after .debug_info was relocated. This defeated the whole purpose of place_sections. See the comment I added before place_sections. Fixes some minor bugs too: - place_sections didn't set VMA for alloc but non-load sections (bss). - zero size sections can have symbols, so they need their VMA set too. - last_vma was incorrectly adjusted. - my last change to place_sections left VMA unchanged for .debug_info when the linker has mapped input to output sections, but this is wrong since bfd_simple_get_relocated_section_contents unmaps debug sections. PR 16867 * dwarf2.c: Formatting. (struct dwarf2_debug): Make adjusted_section_count signed. (unset_sections): Make i signed. (set_debug_vma): New function. (place_sections): Handle separate debug object file. Set VMA on debug sections, even if they have an output section. Also set VMA on zero size sections, and non-load but alloc sections. Set adjusted_section_count to -1 when no section adjustment. Malloc adjusted_sections. Don't double last_vma. Transfer alloc section VMAs to separate debug file. (_bfd_dwarf2_cleanup_debug_info): Free adjusted_sections. (_bfd_dwarf2_slurp_debug_info): Add do_place parameter. Drop test on symbols being the same before using old stash. Read and use separate debug file symbols. Call place_sections. (find_line): Don't call place_sections here. * libbfd-in.h (_bfd_dwarf2_slurp_debug_info): Update proto. * libbfd.h: Regenerate. * mach-o.c (bfd_mach_o_find_nearest_line): Adjust _bfd_dwarf2_slurp_debug_info call. * simple.c (simple_save_output_info): Clarify comment. --- diff --git a/bfd/ChangeLog b/bfd/ChangeLog index cd439b1691d..be151d02a4a 100644 --- a/bfd/ChangeLog +++ b/bfd/ChangeLog @@ -1,3 +1,27 @@ +2014-04-24 Alan Modra + + PR 16867 + * dwarf2.c: Formatting. + (struct dwarf2_debug): Make adjusted_section_count signed. + (unset_sections): Make i signed. + (set_debug_vma): New function. + (place_sections): Handle separate debug object file. Set VMA + on debug sections, even if they have an output section. Also + set VMA on zero size sections, and non-load but alloc sections. + Set adjusted_section_count to -1 when no section adjustment. + Malloc adjusted_sections. Don't double last_vma. Transfer + alloc section VMAs to separate debug file. + (_bfd_dwarf2_cleanup_debug_info): Free adjusted_sections. + (_bfd_dwarf2_slurp_debug_info): Add do_place parameter. Drop + test on symbols being the same before using old stash. Read + and use separate debug file symbols. Call place_sections. + (find_line): Don't call place_sections here. + * libbfd-in.h (_bfd_dwarf2_slurp_debug_info): Update proto. + * libbfd.h: Regenerate. + * mach-o.c (bfd_mach_o_find_nearest_line): Adjust + _bfd_dwarf2_slurp_debug_info call. + * simple.c (simple_save_output_info): Clarify comment. + 2014-04-24 Nick Clifton PR ld/16807 diff --git a/bfd/dwarf2.c b/bfd/dwarf2.c index 6a4f4fd3141..e5579d84f60 100644 --- a/bfd/dwarf2.c +++ b/bfd/dwarf2.c @@ -160,7 +160,7 @@ struct dwarf2_debug bfd_vma *sec_vma; /* Number of sections whose VMA we must adjust. */ - unsigned int adjusted_section_count; + int adjusted_section_count; /* Array of sections with adjusted VMA. */ struct adjusted_section *adjusted_sections; @@ -401,7 +401,7 @@ info_hash_table_newfunc (struct bfd_hash_entry *entry, if (ret == NULL) { ret = (struct info_hash_entry *) bfd_hash_allocate (table, - sizeof (* ret)); + sizeof (* ret)); if (ret == NULL) return NULL; } @@ -461,7 +461,7 @@ insert_info_hash_table (struct info_hash_table *hash_table, return FALSE; node = (struct info_list_node *) bfd_hash_allocate (&hash_table->base, - sizeof (*node)); + sizeof (*node)); if (!node) return FALSE; @@ -509,13 +509,13 @@ read_section (bfd * abfd, if (! msec) { section_name = sec->compressed_name; - if (section_name != NULL) - msec = bfd_get_section_by_name (abfd, section_name); + if (section_name != NULL) + msec = bfd_get_section_by_name (abfd, section_name); } if (! msec) { (*_bfd_error_handler) (_("Dwarf Error: Can't find %s section."), - sec->uncompressed_name); + sec->uncompressed_name); bfd_set_error (bfd_error_bad_value); return FALSE; } @@ -634,7 +634,7 @@ read_indirect_string (struct comp_unit * unit, *bytes_read_ptr = unit->offset_size; if (! read_section (unit->abfd, &stash->debug_sections[debug_str], - stash->syms, offset, + stash->syms, offset, &stash->dwarf_str_buffer, &stash->dwarf_str_size)) return NULL; @@ -645,7 +645,7 @@ read_indirect_string (struct comp_unit * unit, } /* Like read_indirect_string but uses a .debug_str located in - an alternate filepointed to by the .gnu_debuglink section. + an alternate file pointed to by the .gnu_debugaltlink section. Used to impement DW_FORM_GNU_strp_alt. */ static char * @@ -815,7 +815,7 @@ read_abbrevs (bfd *abfd, bfd_uint64_t offset, struct dwarf2_debug *stash) bfd_size_type amt; if (! read_section (abfd, &stash->debug_sections[debug_abbrev], - stash->syms, offset, + stash->syms, offset, &stash->dwarf_abbrev_buffer, &stash->dwarf_abbrev_size)) return NULL; @@ -1313,7 +1313,7 @@ add_line_info (struct line_info_table *table, info->prev_line = table->lcl_head->prev_line; table->lcl_head->prev_line = info; if (address < seq->low_pc) - seq->low_pc = address; + seq->low_pc = address; } return TRUE; } @@ -1504,21 +1504,21 @@ sort_line_sequences (struct line_info_table* table) for (n = 1; n < table->num_sequences; n++) { if (sequences[n].low_pc < last_high_pc) - { + { if (sequences[n].last_line->address <= last_high_pc) /* Skip nested entries. */ continue; /* Trim overlapping entries. */ sequences[n].low_pc = last_high_pc; - } + } last_high_pc = sequences[n].last_line->address; if (n > num_sequences) - { - /* Close up the gap. */ - sequences[num_sequences].low_pc = sequences[n].low_pc; - sequences[num_sequences].last_line = sequences[n].last_line; - } + { + /* Close up the gap. */ + sequences[num_sequences].low_pc = sequences[n].low_pc; + sequences[num_sequences].last_line = sequences[n].last_line; + } num_sequences++; } @@ -1544,7 +1544,7 @@ decode_line_info (struct comp_unit *unit, struct dwarf2_debug *stash) bfd_size_type amt; if (! read_section (abfd, &stash->debug_sections[debug_line], - stash->syms, unit->line_offset, + stash->syms, unit->line_offset, &stash->dwarf_line_buffer, &stash->dwarf_line_size)) return NULL; @@ -1737,7 +1737,7 @@ decode_line_info (struct comp_unit *unit, struct dwarf2_debug *stash) if (!add_line_info (table, address, op_index, filename, line, column, discriminator, 0)) goto line_fail; - discriminator = 0; + discriminator = 0; if (address < low_pc) low_pc = address; if (address > high_pc) @@ -1758,7 +1758,7 @@ decode_line_info (struct comp_unit *unit, struct dwarf2_debug *stash) if (!add_line_info (table, address, op_index, filename, line, column, discriminator, end_sequence)) goto line_fail; - discriminator = 0; + discriminator = 0; if (address < low_pc) low_pc = address; if (address > high_pc) @@ -1799,7 +1799,7 @@ decode_line_info (struct comp_unit *unit, struct dwarf2_debug *stash) break; case DW_LNE_set_discriminator: discriminator = - read_unsigned_leb128 (abfd, line_ptr, &bytes_read); + read_unsigned_leb128 (abfd, line_ptr, &bytes_read); line_ptr += bytes_read; break; case DW_LNE_HP_source_file_correlation: @@ -1819,7 +1819,7 @@ decode_line_info (struct comp_unit *unit, struct dwarf2_debug *stash) if (!add_line_info (table, address, op_index, filename, line, column, discriminator, 0)) goto line_fail; - discriminator = 0; + discriminator = 0; if (address < low_pc) low_pc = address; if (address > high_pc) @@ -1948,20 +1948,20 @@ lookup_address_in_line_info_table (struct line_info_table *table, { /* Note: seq->last_line should be a descendingly sorted list. */ for (each_line = seq->last_line; - each_line; - each_line = each_line->prev_line) - if (addr >= each_line->address) - break; + each_line; + each_line = each_line->prev_line) + if (addr >= each_line->address) + break; if (each_line - && !(each_line->end_sequence || each_line == seq->last_line)) - { - *filename_ptr = each_line->filename; - *linenumber_ptr = each_line->line; - if (discriminator_ptr) - *discriminator_ptr = each_line->discriminator; - return seq->last_line->address - seq->low_pc; - } + && !(each_line->end_sequence || each_line == seq->last_line)) + { + *filename_ptr = each_line->filename; + *linenumber_ptr = each_line->line; + if (discriminator_ptr) + *discriminator_ptr = each_line->discriminator; + return seq->last_line->address - seq->low_pc; + } } *filename_ptr = NULL; @@ -1975,7 +1975,7 @@ read_debug_ranges (struct comp_unit *unit) { struct dwarf2_debug *stash = unit->stash; return read_section (unit->abfd, &stash->debug_sections[debug_ranges], - stash->syms, 0, + stash->syms, 0, &stash->dwarf_ranges_buffer, &stash->dwarf_ranges_size); } @@ -2946,7 +2946,7 @@ comp_unit_hash_info (struct dwarf2_debug *stash, static asection * find_debug_info (bfd *abfd, const struct dwarf_debug_section *debug_sections, - asection *after_sec) + asection *after_sec) { asection *msec; const char *look; @@ -2990,12 +2990,36 @@ find_debug_info (bfd *abfd, const struct dwarf_debug_section *debug_sections, return NULL; } +/* Transfer VMAs from object file to separate debug file. */ + +static void +set_debug_vma (bfd *orig_bfd, bfd *debug_bfd) +{ + asection *s, *d; + + for (s = orig_bfd->sections, d = debug_bfd->sections; + s != NULL && d != NULL; + s = s->next, d = d->next) + { + if ((d->flags & SEC_DEBUGGING) != 0) + break; + /* ??? Assumes 1-1 correspondence between sections in the + two files. */ + if (strcmp (s->name, d->name) == 0) + { + d->output_section = s->output_section; + d->output_offset = s->output_offset; + d->vma = s->vma; + } + } +} + /* Unset vmas for adjusted sections in STASH. */ static void unset_sections (struct dwarf2_debug *stash) { - unsigned int i; + int i; struct adjusted_section *p; i = stash->adjusted_section_count; @@ -3004,14 +3028,23 @@ unset_sections (struct dwarf2_debug *stash) p->section->vma = 0; } -/* Set unique VMAs for loadable and DWARF sections in ABFD and save - VMAs in STASH for unset_sections. */ +/* Set VMAs for allocated and .debug_info sections in ORIG_BFD, a + relocatable object file. VMAs are normally all zero in relocatable + object files, so if we want to distinguish locations in sections by + address we need to set VMAs so the sections do not overlap. We + also set VMA on .debug_info so that when we have multiple + .debug_info sections (or the linkonce variant) they also do not + overlap. The multiple .debug_info sections make up a single + logical section. ??? We should probably do the same for other + debug sections. */ static bfd_boolean -place_sections (bfd *abfd, struct dwarf2_debug *stash) +place_sections (bfd *orig_bfd, struct dwarf2_debug *stash) { + bfd *abfd; struct adjusted_section *p; - unsigned int i; + int i; + const char *debug_info_name; if (stash->adjusted_section_count != 0) { @@ -3019,109 +3052,109 @@ place_sections (bfd *abfd, struct dwarf2_debug *stash) p = stash->adjusted_sections; for (; i > 0; i--, p++) p->section->vma = p->adj_vma; + return TRUE; } - else + + debug_info_name = stash->debug_sections[debug_info].uncompressed_name; + i = 0; + abfd = orig_bfd; + while (1) { asection *sect; - bfd_vma last_vma = 0, last_dwarf = 0; - bfd_size_type amt; - const char *debug_info_name; - debug_info_name = stash->debug_sections[debug_info].uncompressed_name; - i = 0; for (sect = abfd->sections; sect != NULL; sect = sect->next) { - bfd_size_type sz; int is_debug_info; if ((sect->output_section != NULL - && sect->output_section != sect) + && sect->output_section != sect + && (sect->flags & SEC_DEBUGGING) == 0) || sect->vma != 0) continue; - /* We need to adjust the VMAs of any .debug_info sections. - Skip compressed ones, since no relocations could target - them - they should not appear in object files anyway. */ - if (strcmp (sect->name, debug_info_name) == 0) - is_debug_info = 1; - else if (CONST_STRNEQ (sect->name, GNU_LINKONCE_INFO)) - is_debug_info = 1; - else - is_debug_info = 0; - - if (!is_debug_info && (sect->flags & SEC_LOAD) == 0) - continue; + is_debug_info = (strcmp (sect->name, debug_info_name) == 0 + || CONST_STRNEQ (sect->name, GNU_LINKONCE_INFO)); - sz = sect->rawsize ? sect->rawsize : sect->size; - if (sz == 0) + if (!((sect->flags & SEC_ALLOC) != 0 && abfd == orig_bfd) + && !is_debug_info) continue; i++; } - if (i <= 1) - return TRUE; + if (abfd == stash->bfd_ptr) + break; + abfd = stash->bfd_ptr; + } + + if (i <= 1) + stash->adjusted_section_count = -1; + else + { + bfd_vma last_vma = 0, last_dwarf = 0; + bfd_size_type amt = i * sizeof (struct adjusted_section); - amt = i * sizeof (struct adjusted_section); - p = (struct adjusted_section *) bfd_alloc (abfd, amt); - if (! p) + p = (struct adjusted_section *) bfd_malloc (amt); + if (p == NULL) return FALSE; stash->adjusted_sections = p; stash->adjusted_section_count = i; - for (sect = abfd->sections; sect != NULL; sect = sect->next) + abfd = orig_bfd; + while (1) { - bfd_size_type sz; - int is_debug_info; + asection *sect; - if ((sect->output_section != NULL - && sect->output_section != sect) - || sect->vma != 0) - continue; + for (sect = abfd->sections; sect != NULL; sect = sect->next) + { + bfd_size_type sz; + int is_debug_info; - /* We need to adjust the VMAs of any .debug_info sections. - Skip compressed ones, since no relocations could target - them - they should not appear in object files anyway. */ - if (strcmp (sect->name, debug_info_name) == 0) - is_debug_info = 1; - else if (CONST_STRNEQ (sect->name, GNU_LINKONCE_INFO)) - is_debug_info = 1; - else - is_debug_info = 0; + if ((sect->output_section != NULL + && sect->output_section != sect + && (sect->flags & SEC_DEBUGGING) == 0) + || sect->vma != 0) + continue; - if (!is_debug_info && (sect->flags & SEC_LOAD) == 0) - continue; + is_debug_info = (strcmp (sect->name, debug_info_name) == 0 + || CONST_STRNEQ (sect->name, GNU_LINKONCE_INFO)); - sz = sect->rawsize ? sect->rawsize : sect->size; - if (sz == 0) - continue; + if (!((sect->flags & SEC_ALLOC) != 0 && abfd == orig_bfd) + && !is_debug_info) + continue; - p->section = sect; - if (is_debug_info) - { - BFD_ASSERT (sect->alignment_power == 0); - sect->vma = last_dwarf; - last_dwarf += sz; - } - else if (last_vma != 0) - { - /* Align the new address to the current section - alignment. */ - last_vma = ((last_vma - + ~((bfd_vma) -1 << sect->alignment_power)) - & ((bfd_vma) -1 << sect->alignment_power)); - sect->vma = last_vma; - last_vma += sect->vma + sz; - } - else - last_vma += sect->vma + sz; + sz = sect->rawsize ? sect->rawsize : sect->size; - p->adj_vma = sect->vma; + if (is_debug_info) + { + BFD_ASSERT (sect->alignment_power == 0); + sect->vma = last_dwarf; + last_dwarf += sz; + } + else + { + /* Align the new address to the current section + alignment. */ + last_vma = ((last_vma + + ~((bfd_vma) -1 << sect->alignment_power)) + & ((bfd_vma) -1 << sect->alignment_power)); + sect->vma = last_vma; + last_vma += sz; + } - p++; + p->section = sect; + p->adj_vma = sect->vma; + p++; + } + if (abfd == stash->bfd_ptr) + break; + abfd = stash->bfd_ptr; } } + if (orig_bfd != stash->bfd_ptr) + set_debug_vma (orig_bfd, stash->bfd_ptr); + return TRUE; } @@ -3407,9 +3440,10 @@ section_vma_same (const bfd *abfd, const struct dwarf2_debug *stash) bfd_boolean _bfd_dwarf2_slurp_debug_info (bfd *abfd, bfd *debug_bfd, - const struct dwarf_debug_section *debug_sections, - asymbol **symbols, - void **pinfo) + const struct dwarf_debug_section *debug_sections, + asymbol **symbols, + void **pinfo, + bfd_boolean do_place) { bfd_size_type amt = sizeof (struct dwarf2_debug); bfd_size_type total_size; @@ -3418,8 +3452,7 @@ _bfd_dwarf2_slurp_debug_info (bfd *abfd, bfd *debug_bfd, if (stash != NULL) { - if (stash->syms == symbols - && section_vma_same (abfd, stash)) + if (section_vma_same (abfd, stash)) return TRUE; _bfd_dwarf2_cleanup_debug_info (abfd, pinfo); memset (stash, 0, amt); @@ -3455,7 +3488,8 @@ _bfd_dwarf2_slurp_debug_info (bfd *abfd, bfd *debug_bfd, if ((debug_bfd = bfd_openr (debug_filename, NULL)) == NULL || ! bfd_check_format (debug_bfd, bfd_object) || (msec = find_debug_info (debug_bfd, - debug_sections, NULL)) == NULL) + debug_sections, NULL)) == NULL + || !bfd_generic_link_read_symbols (debug_bfd)) { if (debug_bfd) bfd_close (debug_bfd); @@ -3463,10 +3497,17 @@ _bfd_dwarf2_slurp_debug_info (bfd *abfd, bfd *debug_bfd, free (debug_filename); return FALSE; } + + symbols = bfd_get_outsymbols (debug_bfd); + stash->syms = symbols; stash->close_on_cleanup = TRUE; } stash->bfd_ptr = debug_bfd; + if (do_place + && !place_sections (abfd, stash)) + return FALSE; + /* There can be more than one DWARF2 info section in a BFD these days. First handle the easy case when there's only one. If there's more than one, try case two: none of the sections is @@ -3540,7 +3581,7 @@ _bfd_dwarf2_slurp_debug_info (bfd *abfd, bfd *debug_bfd, static bfd_boolean find_line (bfd *abfd, - const struct dwarf_debug_section *debug_sections, + const struct dwarf_debug_section *debug_sections, asection *section, bfd_vma offset, asymbol *symbol, @@ -3574,20 +3615,13 @@ find_line (bfd *abfd, if (discriminator_ptr) *discriminator_ptr = 0; - if (! _bfd_dwarf2_slurp_debug_info (abfd, NULL, - debug_sections, symbols, pinfo)) + if (! _bfd_dwarf2_slurp_debug_info (abfd, NULL, debug_sections, + symbols, pinfo, + (abfd->flags & (EXEC_P | DYNAMIC)) == 0)) return FALSE; stash = (struct dwarf2_debug *) *pinfo; - /* In a relocatable file, 2 functions may have the same address. - We change the section vma so that they won't overlap. */ - if ((abfd->flags & (EXEC_P | DYNAMIC)) == 0) - { - if (! place_sections (abfd, stash)) - return FALSE; - } - do_line = (section == NULL && offset == 0 && functionname_ptr == NULL @@ -3801,7 +3835,7 @@ find_line (bfd *abfd, == stash->sec->size) { stash->sec = find_debug_info (stash->bfd_ptr, debug_sections, - stash->sec); + stash->sec); stash->sec_info_ptr = stash->info_ptr; } @@ -3822,20 +3856,20 @@ find_line (bfd *abfd, bfd_boolean _bfd_dwarf2_find_nearest_line (bfd *abfd, - const struct dwarf_debug_section *debug_sections, + const struct dwarf_debug_section *debug_sections, asection *section, asymbol **symbols, bfd_vma offset, const char **filename_ptr, const char **functionname_ptr, unsigned int *linenumber_ptr, - unsigned int *discriminator_ptr, + unsigned int *discriminator_ptr, unsigned int addr_size, void **pinfo) { return find_line (abfd, debug_sections, section, offset, NULL, symbols, - filename_ptr, functionname_ptr, linenumber_ptr, - discriminator_ptr, addr_size, pinfo); + filename_ptr, functionname_ptr, linenumber_ptr, + discriminator_ptr, addr_size, pinfo); } /* The DWARF2 version of find_line. @@ -3847,13 +3881,13 @@ _bfd_dwarf2_find_line (bfd *abfd, asymbol *symbol, const char **filename_ptr, unsigned int *linenumber_ptr, - unsigned int *discriminator_ptr, + unsigned int *discriminator_ptr, unsigned int addr_size, void **pinfo) { return find_line (abfd, dwarf_debug_sections, NULL, 0, symbol, symbols, - filename_ptr, NULL, linenumber_ptr, discriminator_ptr, - addr_size, pinfo); + filename_ptr, NULL, linenumber_ptr, discriminator_ptr, + addr_size, pinfo); } bfd_boolean @@ -3962,6 +3996,8 @@ _bfd_dwarf2_cleanup_debug_info (bfd *abfd, void **pinfo) free (stash->alt_dwarf_info_buffer); if (stash->sec_vma) free (stash->sec_vma); + if (stash->adjusted_sections) + free (stash->adjusted_sections); if (stash->alt_bfd_ptr) bfd_close (stash->alt_bfd_ptr); } diff --git a/bfd/libbfd-in.h b/bfd/libbfd-in.h index 62804af6d99..8a4f439ad0e 100644 --- a/bfd/libbfd-in.h +++ b/bfd/libbfd-in.h @@ -560,7 +560,8 @@ extern bfd_boolean _bfd_dwarf2_find_inliner_info /* Read DWARF 2 debugging information. */ extern bfd_boolean _bfd_dwarf2_slurp_debug_info - (bfd *, bfd *, const struct dwarf_debug_section *, asymbol **, void **); + (bfd *, bfd *, const struct dwarf_debug_section *, asymbol **, void **, + bfd_boolean); /* Clean up the data used to handle DWARF 2 debugging information. */ extern void _bfd_dwarf2_cleanup_debug_info diff --git a/bfd/libbfd.h b/bfd/libbfd.h index c5cfb44d10f..09f307f8a05 100644 --- a/bfd/libbfd.h +++ b/bfd/libbfd.h @@ -565,7 +565,8 @@ extern bfd_boolean _bfd_dwarf2_find_inliner_info /* Read DWARF 2 debugging information. */ extern bfd_boolean _bfd_dwarf2_slurp_debug_info - (bfd *, bfd *, const struct dwarf_debug_section *, asymbol **, void **); + (bfd *, bfd *, const struct dwarf_debug_section *, asymbol **, void **, + bfd_boolean); /* Clean up the data used to handle DWARF 2 debugging information. */ extern void _bfd_dwarf2_cleanup_debug_info diff --git a/bfd/mach-o.c b/bfd/mach-o.c index 80a50a40a9b..344bb3f4a3f 100644 --- a/bfd/mach-o.c +++ b/bfd/mach-o.c @@ -5660,7 +5660,8 @@ bfd_mach_o_find_nearest_line (bfd *abfd, break; if (! _bfd_dwarf2_slurp_debug_info (abfd, mdata->dsym_bfd, dwarf_debug_sections, symbols, - &mdata->dwarf2_find_line_info)) + &mdata->dwarf2_find_line_info, + FALSE)) return FALSE; } break; diff --git a/bfd/simple.c b/bfd/simple.c index 55a5554e4e5..1331f9b61e9 100644 --- a/bfd/simple.c +++ b/bfd/simple.c @@ -106,6 +106,22 @@ struct saved_offsets struct saved_output_info *sections; }; +/* The sections in ABFD may already have output sections and offsets + set if we are here during linking. + + DWARF-2 specifies offsets into debug sections in many cases and + bfd_simple_get_relocated_section_contents is called to relocate + debug info for a single relocatable object file. So we want + offsets relative to that object file's sections, not offsets in the + output file. For that reason, reset a debug section->output_offset + to zero. + + If not called during linking then set section->output_section to + point back to the input section, because output_section must not be + NULL when calling the relocation routines. + + Save the original output offset and section to restore later. */ + static void simple_save_output_info (bfd *abfd ATTRIBUTE_UNUSED, asection *section, @@ -220,15 +236,6 @@ bfd_simple_get_relocated_section_contents (bfd *abfd, outbuf = data; } - /* The sections in ABFD may already have output sections and offsets set. - Because this function is primarily for debug sections, and GCC uses the - knowledge that debug sections will generally have VMA 0 when emitting - relocations between DWARF-2 sections (which are supposed to be - section-relative offsets anyway), we need to reset the output offsets - to zero. We also need to arrange for section->output_section->vma plus - section->output_offset to equal section->vma, which we do by setting - section->output_section to point back to section. Save the original - output offset and output section to restore later. */ saved_offsets.section_count = abfd->section_count; saved_offsets.sections = malloc (sizeof (*saved_offsets.sections) * saved_offsets.section_count);