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This commit is contained in:
Rui Ueyama 2020-12-18 13:00:09 +09:00
parent ee53f10272
commit 772cb2cfa0
1 changed files with 21 additions and 26 deletions
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47
input_sections.cc
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@ -52,10 +52,19 @@ void InputSection::copy_buf() {
for (int i = 0; i < rels.size(); i++) {
const ElfRela &rel = rels[i];
StringPieceRef &ref = rel_pieces[i];
Symbol &sym = *file->symbols[rel.r_sym];
u8 *loc = base + rel.r_offset;
auto write = [&](u64 val) {
switch (get_rel_size(rel.r_type)) {
case 1: *loc = val; return;
case 2: *(u16 *)loc = val; return;
case 4: *(u32 *)loc = val; return;
case 8: *(u64 *)loc = val; return;
}
unreachable();
};
#define S (ref.piece ? ref.piece->get_addr() : sym.get_addr())
#define A (ref.piece ? ref.addend : rel.r_addend)
#define P (output_section->shdr.sh_addr + offset + rel.r_offset)
@ -63,19 +72,14 @@ void InputSection::copy_buf() {
#define G (sym.get_got_addr() - out::got->shdr.sh_addr)
#define GOT out::got->shdr.sh_addr
int sz = get_rel_size(rel.r_type);
switch (rel_types[i]) {
case R_NONE:
break;
case R_ABS:
if (sz == 4)
*(u32 *)loc = S + A;
else
*(u64 *)loc = S + A;
write(S + A);
if (sym.needs_relative_rel()) {
assert(sz == 8);
assert(get_rel_size(rel.r_type) == 8);
memset(dynrel, 0, sizeof(*dynrel));
dynrel->r_offset = P;
dynrel->r_type = R_X86_64_RELATIVE;
@ -92,28 +96,22 @@ void InputSection::copy_buf() {
dynrel++;
break;
case R_PC:
if (sz == 4)
*(u32 *)loc = S + A - P;
else
*(u64 *)loc = S + A - P;
write(S + A - P);
break;
case R_GOT:
*(u32 *)loc = G + A;
write(G + A);
break;
case R_GOTPC:
*(u32 *)loc = GOT + A - P;
write(GOT + A - P);
break;
case R_GOTPCREL:
*(u32 *)loc = G + GOT + A - P;
write(G + GOT + A - P);
break;
case R_PLT:
if (sz == 4)
*(u32 *)loc = L + A - P;
else
*(u64 *)loc = L + A - P;
write(L + A - P);
break;
case R_TLSGD:
*(u32 *)loc = sym.get_tlsgd_addr() + A - P;
write(sym.get_tlsgd_addr() + A - P);
break;
case R_TLSGD_RELAX_LE: {
// Relax GD to LE
@ -127,7 +125,7 @@ void InputSection::copy_buf() {
break;
}
case R_TLSLD:
*(u32 *)loc = sym.get_tlsld_addr() + A - P;
write(sym.get_tlsld_addr() + A - P);
break;
case R_TLSLD_RELAX_LE: {
// Relax LD to LE
@ -139,13 +137,10 @@ void InputSection::copy_buf() {
break;
}
case R_TPOFF:
if (sz == 4)
*(u32 *)loc = S + A - out::tls_end;
else
*(u64 *)loc = S + A - out::tls_end;
write(S + A - out::tls_end);
break;
case R_GOTTPOFF:
*(u32 *)loc = sym.get_gottpoff_addr() + A - P;
write(sym.get_gottpoff_addr() + A - P);
break;
default:
unreachable();