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Compute hash for .gnu.version_r entries

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David Gonzalez Martin 2024-09-28 20:02:37 -06:00 committed by David
parent f460d8455d
commit 26944f4e53
1 changed files with 49 additions and 17 deletions
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66
bootstrap/main.c
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@ -7576,6 +7576,39 @@ fn u32 st_get_string(SymbolTable* restrict section, String string)
return elf_get_string(&section->string_table, string);
}
STRUCT(StringOffsetAndHash)
{
u32 hash;
u32 offset;
};
fn u32 string_sysv_hash(String string)
{
u32 hash = 0;
for (u32 i = 0; i < string.length; i += 1)
{
hash *= 16;
auto ch = string.pointer[i];
hash += ch;
hash ^= (hash >> 24) & 0xf0;
}
hash &= 0x0fffffff;
return hash;
}
fn StringOffsetAndHash st_get_string_and_hash(SymbolTable* restrict section, String string)
{
auto offset = st_get_string(section, string);
auto hash = string_sysv_hash(string);
return (StringOffsetAndHash){
.offset = offset,
.hash = hash,
};
}
fn u32 elf_get_section_name(ELFBuilder* builder, String name)
{
return elf_get_string(&builder->section_string_table, name);
@ -8037,7 +8070,6 @@ may_be_unused fn void write_elf(Thread* thread, const ObjectOptions* const restr
auto size = content.length + 1;
memcpy(vb_add(&builder->file, size), content.pointer, size);
*section_header = (ELFSectionHeader)
{
.name_offset = interp_section_name,
@ -8074,6 +8106,7 @@ may_be_unused fn void write_elf(Thread* thread, const ObjectOptions* const restr
{
// .note.gnu.property
// Section #2
// This note tells the dynamic linker to use baseline CPU features
auto* gnu_property_section_header = vb_add(&builder->section_headers, 1);
u64 alignment = 8;
gnu_property_alignment = alignment;
@ -8243,7 +8276,6 @@ may_be_unused fn void write_elf(Thread* thread, const ObjectOptions* const restr
auto size = builder->file.length - offset;
*section_header = (ELFSectionHeader) {
.name_offset = name,
.type = ELF_SECTION_GNU_HASH,
@ -8263,8 +8295,8 @@ may_be_unused fn void write_elf(Thread* thread, const ObjectOptions* const restr
auto libc_start_main = st_get_string(&builder->dynamic_st, strlit("__libc_start_main"));
auto cxa_finalize = st_get_string(&builder->dynamic_st, strlit("__cxa_finalize"));
auto libcso6 = st_get_string(&builder->dynamic_st, strlit("libc.so.6"));
auto glibc_225 = st_get_string(&builder->dynamic_st, strlit("GLIBC_2.2.5"));
auto glibc_234 = st_get_string(&builder->dynamic_st, strlit("GLIBC_2.34"));
auto glibc_225 = st_get_string_and_hash(&builder->dynamic_st, strlit("GLIBC_2.2.5"));
auto glibc_234 = st_get_string_and_hash(&builder->dynamic_st, strlit("GLIBC_2.34"));
auto itm_deregister = st_get_string(&builder->dynamic_st, strlit("_ITM_deregisterTMCloneTable"));
auto gmon_start = st_get_string(&builder->dynamic_st, strlit("__gmon_start__"));
auto itm_register = st_get_string(&builder->dynamic_st, strlit("_ITM_registerTMCloneTable"));
@ -8450,32 +8482,32 @@ may_be_unused fn void write_elf(Thread* thread, const ObjectOptions* const restr
auto name = elf_get_section_name(builder, strlit(".gnu.version_r"));
ELFVersionRequirement first_requirement = {
.version = 1,
.count = 2,
.name_offset = libcso6,
.aux_offset = sizeof(ELFVersionRequirement),
.next = 0,
};
*vb_add_struct(&builder->file, ELFVersionRequirement) = first_requirement;
ELFVersionRequirementEntry entries[] = {
{
.hash = 0x9691a75,
.hash = glibc_225.hash,
.flags = 0,
.index = 3,
.name_offset = glibc_225,
.name_offset = glibc_225.offset,
.next = sizeof(ELFVersionRequirementEntry),
},
{
.hash = 0x69691b4,
.hash = glibc_234.hash,
.flags = 0,
.index = 2,
.name_offset = glibc_234,
.name_offset = glibc_234.offset,
.next = 0,
},
};
ELFVersionRequirement first_requirement = {
.version = 1,
.count = array_length(entries),
.name_offset = libcso6,
.aux_offset = sizeof(ELFVersionRequirement),
.next = 0,
};
*vb_add_struct(&builder->file, ELFVersionRequirement) = first_requirement;
memcpy(vb_add(&builder->file, sizeof(entries)), entries, sizeof(entries));
auto size = builder->file.length - offset;