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This commit is contained in:
Rui Ueyama 2020-11-06 12:42:03 +09:00
parent 64e9400fc9
commit 36ac13fad0
2 changed files with 45 additions and 18 deletions
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62
main.cc
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@ -257,11 +257,7 @@ static void scan_rels(ArrayRef<ObjectFile *> files) {
out::relplt->shdr.sh_size = relplt_offset;
}
static void assign_got_offsets(u8 *buf, ArrayRef<ObjectFile *> files) {
u8 *got = buf + out::got->shdr.sh_offset;
u8 *plt = buf + out::plt->shdr.sh_offset;
u8 *relplt = buf + out::relplt->shdr.sh_offset;
static void assign_got_offsets(ArrayRef<ObjectFile *> files) {
for_each(files, [&](ObjectFile *file) {
u32 got_offset = file->got_offset;
u32 gotplt_offset = file->gotplt_offset;
@ -274,13 +270,11 @@ static void assign_got_offsets(u8 *buf, ArrayRef<ObjectFile *> files) {
if (sym->flags & Symbol::NEEDS_GOT) {
sym->got_offset = got_offset;
*(u64 *)(got + got_offset) = sym->addr;
got_offset += 8;
}
if (sym->flags & Symbol::NEEDS_GOTTP) {
sym->gottp_offset = got_offset;
*(u64 *)(got + got_offset) = sym->addr - out::tls_end;
got_offset += 8;
}
@ -291,17 +285,43 @@ static void assign_got_offsets(u8 *buf, ArrayRef<ObjectFile *> files) {
// Write a .plt entry
sym->plt_offset = plt_offset;
u64 S = out::gotplt->shdr.sh_addr + sym->gotplt_offset;
u64 P = out::plt->shdr.sh_addr + sym->plt_offset;
out::plt->write_entry(plt + plt_offset, S - P - 6);
plt_offset += 16;
// Write a .rela.dyn entry
auto *rel = (ELF64LE::Rela *)(relplt + relplt_offset);
sym->relplt_offset = relplt_offset;
relplt_offset += sizeof(ELF64LE::Rela);
}
}
});
}
static void write_got(u8 *buf, ArrayRef<ObjectFile *> files) {
u8 *got = buf + out::got->shdr.sh_offset;
u8 *plt = buf + out::plt->shdr.sh_offset;
u8 *relplt = buf + out::relplt->shdr.sh_offset;
for_each(files, [&](ObjectFile *file) {
for (Symbol *sym : file->symbols) {
if (sym->file != file)
continue;
if (sym->flags & Symbol::NEEDS_GOT)
*(u64 *)(got + sym->got_offset) = sym->addr;
if (sym->flags & Symbol::NEEDS_GOTTP)
*(u64 *)(got + sym->gottp_offset) = sym->addr - out::tls_end;
if (sym->flags & Symbol::NEEDS_PLT) {
// Write a .plt entry
u64 S = out::gotplt->shdr.sh_addr + sym->gotplt_offset;
u64 P = out::plt->shdr.sh_addr + sym->plt_offset;
out::plt->write_entry(plt + sym->plt_offset, S - P - 6);
// Write a .rela.dyn entry
auto *rel = (ELF64LE::Rela *)(relplt + sym->relplt_offset);
rel->r_offset = out::gotplt->shdr.sh_addr + sym->gotplt_offset;
rel->setType(R_X86_64_IRELATIVE, false);
rel->r_addend = sym->addr;
relplt_offset += sizeof(ELF64LE::Rela);
}
}
});
@ -823,6 +843,12 @@ int main(int argc, char **argv) {
filesize = set_osec_offsets(output_chunks);
}
// Assign symbols to GOT offsets
{
MyTimer t("got", before_copy);
assign_got_offsets(files);
}
// Fix linker-synthesized symbol addresses.
fix_synthetic_symbols(output_chunks);
@ -854,12 +880,6 @@ int main(int argc, char **argv) {
u8 *buf = output_buffer->getBufferStart();
// Assign symbols to GOT offsets
{
MyTimer t("got");
assign_got_offsets(buf, files);
}
// Fill .symtab and .strtab
{
MyTimer t("write_symtab");
@ -872,6 +892,12 @@ int main(int argc, char **argv) {
for_each(output_chunks, [&](OutputChunk *chunk) { chunk->copy_to(buf); });
}
// Fill .plt, .got, got.plt and .rela.plt sections
{
MyTimer t("write_got");
write_got(buf, files);
}
out::shdr->copy_to(buf);
{

1
mold.h
View File

@ -171,6 +171,7 @@ public:
u32 gotplt_offset = 0;
u32 gottp_offset = 0;
u32 plt_offset = 0;
u32 relplt_offset = 0;
u32 shndx = 0;