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/* vim: set expandtab tabstop=4 softtabstop=4 shiftwidth=4: */
/*
* Copyright © 2016 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include <elf.h>
#include <stdio.h>
#include <string.h>
#include "build-id.h"
extern const ElfW(Nhdr) __note_gnu_build_id_start[] __attribute__((weak));
extern const ElfW(Nhdr) __note_gnu_build_id_end[] __attribute__((weak));
void
so_print(void)
{
extern char etext, edata, end;
printf("Shared object:\n");
printf(" program text (etext) %10p\n", &etext);
printf(" initialized data (edata) %10p\n", &edata);
printf(" uninitialized data (end) %10p\n", &end);
printf(" note section start %10p\n", __note_gnu_build_id_start);
printf(" note section end %10p\n", __note_gnu_build_id_end);
}
const ElfW(Nhdr) *
build_id_find_nhdr(void)
{
const ElfW(Nhdr) *nhdr = (void *)__note_gnu_build_id_start;
if (__note_gnu_build_id_start >= __note_gnu_build_id_end) {
fprintf(stderr, "No .note section\n");
return NULL;
}
while (nhdr->n_type != NT_GNU_BUILD_ID)
{
nhdr = (ElfW(Nhdr) *)
((intptr_t)nhdr + sizeof(ElfW(Nhdr)) + nhdr->n_namesz + nhdr->n_descsz);
if (nhdr >= __note_gnu_build_id_end) {
fprintf(stderr, "No .note.gnu.build-id section found\n");
return NULL;
}
}
return nhdr;
}
ElfW(Word)
build_id_length(const ElfW(Nhdr) *nhdr)
{
return nhdr->n_descsz;
}
void
build_id_read(const ElfW(Nhdr) *nhdr, unsigned char *build_id)
{
memcpy(build_id,
(unsigned char *)nhdr + sizeof(ElfW(Nhdr)) + nhdr->n_namesz,
nhdr->n_descsz);
}
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