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helper for extracting GNU debug link info

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This commit is contained in:
Nikita Smith
2025-03-22 20:37:00 -07:00
parent 48f0702e05
commit 0c3a37af44
2 changed files with 60 additions and 0 deletions
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src/elf/elf_parse.c
+53
View File
@@ -88,3 +88,56 @@ elf_shdr64_array_from_bin(Arena *arena, String8 raw_data, ELF_Hdr64 *hdr)
return result;
}
internal String8
elf_name_from_shdr64(String8 raw_data, ELF_Hdr64 *hdr, Rng1U64 sh_name_range, ELF_Shdr64 *shdr)
{
String8 sh_names = str8_substr(raw_data, sh_name_range);
String8 name = {0};
str8_deserial_read_cstr(sh_names, shdr->sh_name, &name);
return name;
}
internal U64
elf_base_addr_from_bin(ELF_Hdr64 *hdr)
{
NotImplemented;
return 0;
}
internal B32
elf_parse_debug_link(String8 raw_data, ELF_BinInfo *elf, ELF_GnuDebugLink *debug_link_out)
{
Temp scratch = scratch_begin(0,0);
B32 is_debug_link_present = 0;
ELF_Shdr64Array sections = elf_shdr64_array_from_bin(scratch.arena, raw_data, &elf->hdr);
for (U64 i = 0; i < sections.count; ++i) {
ELF_Shdr64 *shdr = &sections.v[i];
String8 name = elf_name_from_shdr64(raw_data, &elf->hdr, elf->sh_name_range, shdr);
if (str8_match(name, str8_lit(".gnu_debuglink"), 0)) {
Rng1U64 raw_data_range = rng_1u64(shdr->sh_offset, shdr->sh_offset + shdr->sh_size);
String8 data = str8_substr(raw_data, raw_data_range);
String8 path = {0};
U32 checksum = 0;
{
U64 cursor = 0;
cursor += str8_deserial_read_cstr(data, cursor, &path);
cursor = AlignPow2(cursor, 4);
cursor += str8_deserial_read_struct(data, cursor, &checksum);
}
debug_link_out->path = path;
debug_link_out->checksum = checksum;
is_debug_link_present = 1;
break;
}
}
scratch_end(scratch);
return is_debug_link_present;
}
src/elf/elf_parse.h
+7
View File
@@ -18,6 +18,12 @@ typedef struct ELF_Shdr64Array
ELF_Shdr64 *v;
} ELF_Shdr64Array;
typedef struct ELF_GnuDebugLink
{
String8 path;
U32 checksum;
} ELF_GnuDebugLink;
////////////////////////////////
internal B32 elf_check_magic(String8 data);
@@ -25,5 +31,6 @@ internal ELF_BinInfo elf_bin_from_data(String8 data);
internal ELF_Shdr64Array elf_shdr64_array_from_bin(Arena *arena, String8 raw_data, ELF_Hdr64 *hdr);
internal String8 elf_name_from_shdr64(String8 raw_data, ELF_Hdr64 *hdr, Rng1U64 sh_name_range, ELF_Shdr64 *shdr);
internal U64 elf_base_addr_from_bin(ELF_Hdr64 *hdr);
#endif // ELF_PARSE_H