diff options
| author | Evgeniy Stepanov <eugeni.stepanov@gmail.com> | 2018-01-23 21:27:07 +0000 |
|---|---|---|
| committer | Evgeniy Stepanov <eugeni.stepanov@gmail.com> | 2018-01-23 21:27:07 +0000 |
| commit | d5a6fdbe95943f63d6b003a4d883437d7645ff46 (patch) | |
| tree | b31b76a6b29d48881fd96999593ba29e852c8e40 /llvm/test/CodeGen/X86 | |
| parent | c1e2290d373b461f71744ad0792e8306a66f0dee (diff) | |
| download | bcm5719-llvm-d5a6fdbe95943f63d6b003a4d883437d7645ff46.tar.gz bcm5719-llvm-d5a6fdbe95943f63d6b003a4d883437d7645ff46.zip | |
[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
Diffstat (limited to 'llvm/test/CodeGen/X86')
| -rw-r--r-- | llvm/test/CodeGen/X86/safestack.ll | 8 | ||||
| -rw-r--r-- | llvm/test/CodeGen/X86/safestack_inline.ll | 30 |
2 files changed, 38 insertions, 0 deletions
diff --git a/llvm/test/CodeGen/X86/safestack.ll b/llvm/test/CodeGen/X86/safestack.ll index bd8f57f5e3c..a9d1b32cfcf 100644 --- a/llvm/test/CodeGen/X86/safestack.ll +++ b/llvm/test/CodeGen/X86/safestack.ll @@ -4,6 +4,8 @@ ; RUN: llc -mtriple=x86_64-linux-android < %s -o - | FileCheck --check-prefix=ANDROID-X64 %s ; RUN: llc -mtriple=x86_64-fuchsia < %s -o - | FileCheck --check-prefix=FUCHSIA-X64 %s +; RUN: llc -mtriple=i386-linux -safestack-use-pointer-address < %s -o - | FileCheck --check-prefix=LINUX-I386-PA %s + define void @_Z1fv() safestack { entry: %x = alloca i32, align 4 @@ -35,3 +37,9 @@ declare void @_Z7CapturePi(i32*) ; FUCHSIA-X64: movq %fs:24, %[[A:.*]] ; FUCHSIA-X64: leaq -16(%[[A]]), %[[B:.*]] ; FUCHSIA-X64: movq %[[B]], %fs:24 + +; LINUX-I386-PA: calll __safestack_pointer_address +; LINUX-I386-PA: movl %eax, %[[A:.*]] +; LINUX-I386-PA: movl (%[[A]]), %[[B:.*]] +; LINUX-I386-PA: leal -16(%[[B]]), %[[C:.*]] +; LINUX-I386-PA: movl %[[C]], (%[[A]]) diff --git a/llvm/test/CodeGen/X86/safestack_inline.ll b/llvm/test/CodeGen/X86/safestack_inline.ll new file mode 100644 index 00000000000..ed93c498564 --- /dev/null +++ b/llvm/test/CodeGen/X86/safestack_inline.ll @@ -0,0 +1,30 @@ +; 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:.*]] +; CALL: movq (%[[A]]), %[[B:.*]] +; CALL: leaq -16(%[[B]]), %[[C:.*]] +; CALL: movq %[[C]], (%[[A]]) |
