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Implement TLSDESC for AArch64

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This commit is contained in:
Rui Ueyama 2021-08-22 11:34:22 +00:00
parent a82bc71088
commit 3c79d672dc
3 changed files with 31 additions and 2 deletions
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20
arch-aarch64.cc
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@ -107,6 +107,9 @@ void EhFrameSection<AARCH64>::apply_reloc(Context<AARCH64> &ctx,
u8 *base = ctx.buf + this->shdr.sh_offset;
switch (rel.r_type) {
case R_AARCH64_ABS64:
*(u64 *)(base + loc) = val;
return;
case R_AARCH64_PREL32:
*(u32 *)(base + loc) = val;
return;
@ -215,6 +218,17 @@ void InputSection<AARCH64>::apply_reloc_alloc(Context<AARCH64> &ctx, u8 *base) {
case R_AARCH64_TLSLE_ADD_TPREL_LO12_NC:
*(u32 *)loc |= extract(S + A - ctx.tls_begin + 16, 11, 0) << 10;
continue;
case R_AARCH64_TLSDESC_ADR_PAGE21:
write_addr(loc, (page(sym.get_tlsdesc_addr(ctx) + A) - page(P)) >> 12);
continue;
case R_AARCH64_TLSDESC_LD64_LO12:
*(u32 *)loc |= extract(sym.get_tlsdesc_addr(ctx) + A, 11, 3) << 10;
continue;
case R_AARCH64_TLSDESC_ADD_LO12:
*(u32 *)loc |= extract(sym.get_tlsdesc_addr(ctx) + A, 11, 0) << 10;
continue;
case R_AARCH64_TLSDESC_CALL:
continue;
default:
unreachable(ctx);
}
@ -338,6 +352,11 @@ void InputSection<AARCH64>::scan_relocations(Context<AARCH64> &ctx) {
dispatch(ctx, table, i);
break;
}
case R_AARCH64_TLSDESC_ADR_PAGE21:
case R_AARCH64_TLSDESC_LD64_LO12:
case R_AARCH64_TLSDESC_ADD_LO12:
sym.flags |= NEEDS_TLSDESC;
break;
case R_AARCH64_ADD_ABS_LO12_NC:
case R_AARCH64_LDST64_ABS_LO12_NC:
case R_AARCH64_LDST32_ABS_LO12_NC:
@ -349,6 +368,7 @@ void InputSection<AARCH64>::scan_relocations(Context<AARCH64> &ctx) {
case R_AARCH64_PREL32:
case R_AARCH64_TLSLE_ADD_TPREL_HI12:
case R_AARCH64_TLSLE_ADD_TPREL_LO12_NC:
case R_AARCH64_TLSDESC_CALL:
break;
default:
Error(ctx) << *this << ": unknown relocation: "

2
mold.h
View File

@ -1856,7 +1856,7 @@ public:
// ARM object files contain "$d" local symbol at the beginning
// of data sections. Their values are not significant for .eh_frame,
// so we just treat them as offset 0.
if (name() == "$d")
if (name() == "$d" || name().starts_with("$d."))
return ctx.eh_frame->shdr.sh_addr;
Fatal(ctx) << "symbol referring .eh_frame is not supported: "

11
test/tlsdesc.sh
View File

@ -6,7 +6,16 @@ echo -n "Testing $(basename -s .sh $0) ... "
t=$(pwd)/tmp/$(basename -s .sh $0)
mkdir -p $t
cat <<EOF | gcc -fPIC -mtls-dialect=gnu2 -c -o $t/a.o -xc -
if [ $(uname -m) = x86_64 ]; then
dialect=gnu2
elif [ $(uname -m) = aarch64 ]; then
dialect=desc
else
echo skipped
exit 0
fi
cat <<EOF | gcc -fPIC -mtls-dialect=$dialect -c -o $t/a.o -xc -
extern _Thread_local int foo;
int get_foo() {