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llvm-project/llvm/test/CodeGen/X86/safestack_inline.ll

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[safestack] Inline safestack pointer access when possible. Summary: This adds an -mllvm flag that forces the use of a runtime function call to get the unsafe stack pointer, the same that is currently used on non-x86, non-aarch64 android. The call may be inlined. Reviewers: pcc Subscribers: aemerson, kristof.beyls, hiraditya, llvm-commits Differential Revision: https://reviews.llvm.org/D37405 llvm-svn: 323259
2018-01-24 05:27:07 +08:00
; RUN: sed -e "s/ATTR//" %s | llc -mtriple=x86_64-linux -safestack-use-pointer-address | FileCheck --check-prefix=INLINE %s
; RUN: sed -e "s/ATTR/noinline/" %s | llc -mtriple=x86_64-linux -safestack-use-pointer-address | FileCheck --check-prefix=CALL %s
@p = external thread_local global i8*, align 8
define nonnull i8** @__safestack_pointer_address() local_unnamed_addr ATTR {
entry:
ret i8** @p
}
define void @_Z1fv() safestack {
entry:
%x = alloca i32, align 4
%0 = bitcast i32* %x to i8*
call void @_Z7CapturePi(i32* nonnull %x)
ret void
}
declare void @_Z7CapturePi(i32*)
; INLINE: movq p@GOTTPOFF(%rip), %[[A:.*]]
; INLINE: movq %fs:(%[[A]]), %[[B:.*]]
; INLINE: leaq -16(%[[B]]), %[[C:.*]]
; INLINE: movq %[[C]], %fs:(%[[A]])
; CALL: callq __safestack_pointer_address
; CALL: movq %rax, %[[A:.*]]
Revert "[MachineCopyPropagation] Extend pass to do COPY source forwarding" This reverts commit r323991. This commit breaks target that don't model all the register constraints in TableGen. So far the workaround was to set the hasExtraXXXRegAllocReq, but it proves that it doesn't cover all the cases. For instance, when mutating an instruction (like in the lowering of COPYs) the isRenamable flag is not properly updated. The same problem will happen when attaching machine operand from one instruction to another. Geoff Berry is working on a fix in https://reviews.llvm.org/D43042. llvm-svn: 325421
2018-02-17 11:05:33 +08:00
; CALL: movq (%[[A]]), %[[B:.*]]
[safestack] Inline safestack pointer access when possible. Summary: This adds an -mllvm flag that forces the use of a runtime function call to get the unsafe stack pointer, the same that is currently used on non-x86, non-aarch64 android. The call may be inlined. Reviewers: pcc Subscribers: aemerson, kristof.beyls, hiraditya, llvm-commits Differential Revision: https://reviews.llvm.org/D37405 llvm-svn: 323259
2018-01-24 05:27:07 +08:00
; CALL: leaq -16(%[[B]]), %[[C:.*]]
; CALL: movq %[[C]], (%[[A]])