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[Fuchsia] Use %gs for ABI slots under -mcmodel=kernel

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Make x86_64-fuchsia targets under -mcmodel=kernel use %gs rather
than %fs to access ABI slots for stack-protector and safe-stack

Patch by Roland McGrath.

Differential Revision: https://reviews.llvm.org/D30870

llvm-svn: 298302
This commit is contained in:
Evgeniy Stepanov 2017-03-20 20:35:37 +00:00
parent b1578d3612
commit e829eecc05
1 changed files with 2 additions and 2 deletions
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4
llvm/lib/Target/X86/X86ISelLowering.cpp
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@ -2077,7 +2077,7 @@ Value *X86TargetLowering::getIRStackGuard(IRBuilder<> &IRB) const {
if (hasStackGuardSlotTLS(Subtarget.getTargetTriple())) {
if (Subtarget.isTargetFuchsia()) {
// <magenta/tls.h> defines MX_TLS_STACK_GUARD_OFFSET with this value.
return SegmentOffset(IRB, 0x10, 257);
return SegmentOffset(IRB, 0x10, getAddressSpace());
} else {
// %fs:0x28, unless we're using a Kernel code model, in which case
// it's %gs:0x28. gs:0x14 on i386.
@ -2142,7 +2142,7 @@ Value *X86TargetLowering::getSafeStackPointerLocation(IRBuilder<> &IRB) const {
// Fuchsia is similar.
if (Subtarget.isTargetFuchsia()) {
// <magenta/tls.h> defines MX_TLS_UNSAFE_SP_OFFSET with this value.
return SegmentOffset(IRB, 0x18, 257);
return SegmentOffset(IRB, 0x18, getAddressSpace());
}
return TargetLowering::getSafeStackPointerLocation(IRB);