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--- binutils.orig/gas/write.c 2018-05-14 12:22:27.893671804 +0100
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+++ binutils-2.30/gas/write.c 2018-05-14 15:39:03.900509629 +0100
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@@ -1901,6 +1901,7 @@ maybe_generate_build_notes (void)
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segT sec;
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char * note;
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offsetT note_size;
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+ offsetT total_size;
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offsetT desc_size;
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offsetT desc2_offset;
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int desc_reloc;
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@@ -1918,7 +1919,8 @@ maybe_generate_build_notes (void)
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SEC_READONLY | SEC_HAS_CONTENTS | SEC_DATA);
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bfd_set_section_alignment (stdoutput, sec, 2);
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- /* Create a version note. */
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+ /* Work out the size of the notes that we will create,
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+ and the relocation we should use. */
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if (bfd_arch_bits_per_address (stdoutput) <= 32)
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{
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note_size = 28;
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@@ -1952,65 +1954,59 @@ maybe_generate_build_notes (void)
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desc_reloc = BFD_RELOC_64;
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}
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- frag_now_fix ();
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- note = frag_more (note_size);
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- memset (note, 0, note_size);
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+ /* We have to create a note for *each* code section.
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+ Linker garbage collection might discard some. */
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+ total_size = 0;
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+ note = NULL;
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- if (target_big_endian)
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- {
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- note[3] = 8; /* strlen (name) + 1. */
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- note[7] = desc_size; /* Two 8-byte offsets. */
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- note[10] = NT_GNU_BUILD_ATTRIBUTE_OPEN >> 8;
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- note[11] = NT_GNU_BUILD_ATTRIBUTE_OPEN & 0xff;
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- }
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- else
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- {
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- note[0] = 8; /* strlen (name) + 1. */
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- note[4] = desc_size; /* Two 8-byte offsets. */
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- note[8] = NT_GNU_BUILD_ATTRIBUTE_OPEN & 0xff;
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- note[9] = NT_GNU_BUILD_ATTRIBUTE_OPEN >> 8;
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- }
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-
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- /* The a1 version number indicates that this note was
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- generated by the assembler and not the gcc annobin plugin. */
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- memcpy (note + 12, "GA$3a1", 8);
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-
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- /* Find the first code section symbol. */
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for (sym = symbol_rootP; sym != NULL; sym = sym->sy_next)
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if (sym->bsym != NULL
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&& sym->bsym->flags & BSF_SECTION_SYM
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&& sym->bsym->section != NULL
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- && sym->bsym->section->flags & SEC_CODE)
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+ /* Skip linkonce sections - we cannot these section symbols as they may disappear. */
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+ && (sym->bsym->section->flags & (SEC_CODE | SEC_LINK_ONCE)) == SEC_CODE
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+ /* Not all linkonce sections are flagged... */
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+ && strncmp (S_GET_NAME (sym), ".gnu.linkonce", sizeof ".gnu.linkonce" - 1) != 0)
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{
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- /* Found one - now create a relocation against this symbol. */
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- create_note_reloc (sec, sym, 20, desc_reloc, 0, note);
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- break;
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- }
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+ /* Create a version note. */
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+ frag_now_fix ();
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+ note = frag_more (note_size);
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+ memset (note, 0, note_size);
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- /* Find the last code section symbol. */
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- if (sym)
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- {
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- for (sym = symbol_lastP; sym != NULL; sym = sym->sy_previous)
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- if (sym->bsym != NULL
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- && sym->bsym->flags & BSF_SECTION_SYM
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- && sym->bsym->section != NULL
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- && sym->bsym->section->flags & SEC_CODE)
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+ if (target_big_endian)
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{
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- /* Create a relocation against the end of this symbol. */
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- create_note_reloc (sec, sym, desc2_offset, desc_reloc,
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- bfd_get_section_size (sym->bsym->section),
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- note);
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- break;
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+ note[3] = 8; /* strlen (name) + 1. */
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+ note[7] = desc_size; /* Two 8-byte offsets. */
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+ note[10] = NT_GNU_BUILD_ATTRIBUTE_OPEN >> 8;
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+ note[11] = NT_GNU_BUILD_ATTRIBUTE_OPEN & 0xff;
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}
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- }
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- /* else - if we were unable to find any code section symbols then
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- probably there is no code in the output. So leaving the start
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- and end values as zero in the note is OK. */
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+ else
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+ {
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+ note[0] = 8; /* strlen (name) + 1. */
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+ note[4] = desc_size; /* Two 8-byte offsets. */
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+ note[8] = NT_GNU_BUILD_ATTRIBUTE_OPEN & 0xff;
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+ note[9] = NT_GNU_BUILD_ATTRIBUTE_OPEN >> 8;
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+ }
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+
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+ /* The a1 version number indicates that this note was
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+ generated by the assembler and not the gcc annobin plugin. */
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+ memcpy (note + 12, "GA$3a1", 8);
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- /* FIXME: Maybe add a note recording the assembler command line and version ? */
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+ /* Create a relocation to install the start address of the note... */
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+ create_note_reloc (sec, sym, 20, desc_reloc, 0, note);
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+
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+ /* ...and another one to install the end address. */
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+ create_note_reloc (sec, sym, desc2_offset, desc_reloc,
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+ bfd_get_section_size (sym->bsym->section),
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+ note);
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+
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+ total_size += note_size;
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+ /* FIXME: Maybe add a note recording the assembler command line and version ? */
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+ }
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/* Install the note(s) into the section. */
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- bfd_set_section_contents (stdoutput, sec, (bfd_byte *) note, 0, note_size);
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+ if (total_size)
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+ bfd_set_section_contents (stdoutput, sec, (bfd_byte *) note, 0, total_size);
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subsegs_finish_section (sec);
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relax_segment (seg_info (sec)->frchainP->frch_root, sec, 0);
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size_seg (stdoutput, sec, NULL);
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