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readelf: dump elf note data

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Output format is compatible with GNU readelf's handling of unknown note
types (modulo a GNU char signedness bug); future changes will add type-
specific decoding.

Reviewed by:	kib
MFC after:	1 week
Relnotes:	Yes
Sponsored by:	The FreeBSD Foundation
This commit is contained in:
Ed Maste 2019-01-31 17:04:55 +00:00
parent 97d368d62b
commit 675f752cc5
1 changed files with 9 additions and 3 deletions
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12
contrib/elftoolchain/readelf/readelf.c
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@ -3567,6 +3567,7 @@ dump_notes_content(struct readelf *re, const char *buf, size_t sz, off_t off)
{
Elf_Note *note;
const char *end, *name;
uint32_t i;
printf("\nNotes at offset %#010jx with length %#010jx:\n",
(uintmax_t) off, (uintmax_t) sz);
@ -3578,7 +3579,9 @@ dump_notes_content(struct readelf *re, const char *buf, size_t sz, off_t off)
return;
}
note = (Elf_Note *)(uintptr_t) buf;
name = (char *)(uintptr_t)(note + 1);
buf += sizeof(Elf_Note);
name = buf;
buf += roundup2(note->n_namesz, 4);
/*
* The name field is required to be nul-terminated, and
* n_namesz includes the terminating nul in observed
@ -3596,8 +3599,11 @@ dump_notes_content(struct readelf *re, const char *buf, size_t sz, off_t off)
printf(" %-13s %#010jx", name, (uintmax_t) note->n_descsz);
printf(" %s\n", note_type(name, re->ehdr.e_type,
note->n_type));
buf += sizeof(Elf_Note) + roundup2(note->n_namesz, 4) +
roundup2(note->n_descsz, 4);
printf(" description data:");
for (i = 0; i < note->n_descsz; i++)
printf(" %02x", (unsigned char)buf[i]);
printf("\n");
buf += roundup2(note->n_descsz, 4);
}
}