birth-software/bloat-buster
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Decipher some .debug sections

Browse Source
This commit is contained in:
David Gonzalez Martin 2024-09-19 07:13:02 -06:00 committed by David
parent 271c2614cc
commit 7900290013
1 changed files with 42 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

57
bootstrap/main.c
View File

@ -9662,16 +9662,22 @@ may_be_unused fn void write_elf(Thread* thread, const ObjectOptions* const restr
auto name = elf_get_section_name(builder, strlit(".debug_str")); auto name = elf_get_section_name(builder, strlit(".debug_str"));
u8 data[] = { String strings[] = {
0x63, 0x6C, 0x61, 0x6E, 0x67, 0x20, 0x76, 0x65, 0x72, 0x73, 0x69, 0x6F, 0x6E, 0x20, 0x31, 0x38, strlit("clang version 18.1.8"),
0x2E, 0x31, 0x2E, 0x38, 0x00, 0x6D, 0x61, 0x69, 0x6E, 0x2E, 0x63, 0x00, 0x2F, 0x68, 0x6F, 0x6D, strlit("main.c"),
0x65, 0x2F, 0x64, 0x61, 0x76, 0x69, 0x64, 0x2F, 0x6D, 0x69, 0x6E, 0x69, 0x6D, 0x61, 0x6C, 0x00, strlit("/home/david/minimal"),
0x6D, 0x61, 0x69, 0x6E, 0x00, 0x69, 0x6E, 0x74, 0x00, strlit("main"),
strlit("int"),
}; };
auto size = sizeof(data); for (u32 i = 0; i < array_length(strings); i += 1)
{
String string = strings[i];
auto string_length = string.length + 1;
memcpy(vb_add(&builder->file, string_length), string.pointer, string_length);
}
memcpy(vb_add(&builder->file, size), data, size); auto size = builder->file.length - offset;
*section_header = (ELFSectionHeader) { *section_header = (ELFSectionHeader) {
.name_offset = name, .name_offset = name,
@ -9700,11 +9706,17 @@ may_be_unused fn void write_elf(Thread* thread, const ObjectOptions* const restr
auto name = elf_get_section_name(builder, strlit(".debug_addr")); auto name = elf_get_section_name(builder, strlit(".debug_addr"));
u8 data[] = { 0x0C, 0x00, 0x00, 0x00, 0x05, 0x00, 0x08, 0x00, 0x1C, 0x11, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, }; *vb_add_struct(&builder->file, DwarfAddressTableHeader) = (DwarfAddressTableHeader) {
.unit_length = 0xc,
.version = 5,
.address_size = 8,
.segment_selector_size = 0,
};
auto size = sizeof(data); u64 addresses[] = { 0x111c };
memcpy(vb_add(&builder->file, sizeof(addresses)), addresses, sizeof(addresses));
memcpy(vb_add(&builder->file, size), data, size); auto size = builder->file.length - offset;
*section_header = (ELFSectionHeader) { *section_header = (ELFSectionHeader) {
.name_offset = name, .name_offset = name,
@ -9766,14 +9778,29 @@ may_be_unused fn void write_elf(Thread* thread, const ObjectOptions* const restr
auto name = elf_get_section_name(builder, strlit(".debug_str_offsets")); auto name = elf_get_section_name(builder, strlit(".debug_str_offsets"));
u8 data[] = { STRUCT(DwarfDebugStrOffsetsHeader)
0x18, 0x00, 0x00, 0x00, 0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x15, 0x00, 0x00, 0x00, {
0x1C, 0x00, 0x00, 0x00, 0x30, 0x00, 0x00, 0x00, 0x35, 0x00, 0x00, 0x00, u32 length;
u16 version;
u8 padding[2];
}; };
auto size = sizeof(data); *vb_add_struct(&builder->file, DwarfDebugStrOffsetsHeader) = (DwarfDebugStrOffsetsHeader) {
.length = 0x18,
.version = 5,
};
memcpy(vb_add(&builder->file, size), data, size); u32 offsets[] = {
0,
0x15,
0x1c,
0x30,
0x35,
};
memcpy(vb_add(&builder->file, sizeof(offsets)), offsets, sizeof(offsets));
auto size = builder->file.length - offset;
*section_header = (ELFSectionHeader) { *section_header = (ELFSectionHeader) {
.name_offset = name, .name_offset = name,