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| author | Akira Hatanaka <ahatanaka@apple.com> | 2014-08-07 23:08:24 +0000 |
|---|---|---|
| committer | Akira Hatanaka <ahatanaka@apple.com> | 2014-08-07 23:08:24 +0000 |
| commit | 5acc58fcfb403d1638856133088727c4e1a22fce (patch) | |
| tree | 703dbd5fe012afcf1eb68ec66c210732c6c69da8 /llvm/test/CodeGen/AArch64/stack-guard-remat-bitcast.ll | |
| parent | 80c8b2742fc6efa79f31d28359923b366a588277 (diff) | |
| download | bcm5719-llvm-5acc58fcfb403d1638856133088727c4e1a22fce.tar.gz bcm5719-llvm-5acc58fcfb403d1638856133088727c4e1a22fce.zip | |
[stack protector] Look through bitcasts to get global variable
__stack_chk_guard.
Handle the case where the pointer operand of the load instruction that loads the
stack guard is not a global variable but instead a bitcast.
%StackGuard = load i8** bitcast (i64** @__stack_chk_guard to i8**)
call void @llvm.stackprotector(i8* %StackGuard, i8** %StackGuardSlot)
Original test case provided by Ana Pazos.
This fixes PR20558.
llvm-svn: 215167
Diffstat (limited to 'llvm/test/CodeGen/AArch64/stack-guard-remat-bitcast.ll')
| -rw-r--r-- | llvm/test/CodeGen/AArch64/stack-guard-remat-bitcast.ll | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/llvm/test/CodeGen/AArch64/stack-guard-remat-bitcast.ll b/llvm/test/CodeGen/AArch64/stack-guard-remat-bitcast.ll new file mode 100644 index 00000000000..bedbf5facbb --- /dev/null +++ b/llvm/test/CodeGen/AArch64/stack-guard-remat-bitcast.ll @@ -0,0 +1,26 @@ +; RUN: llc < %s -mtriple=arm64-apple-ios -relocation-model=pic | FileCheck %s + +@__stack_chk_guard = external global i64* + +; PR20558 + +; CHECK: adrp [[R0:x[0-9]+]], ___stack_chk_guard@GOTPAGE +; CHECK: ldr [[R1:x[0-9]+]], {{\[}}[[R0]], ___stack_chk_guard@GOTPAGEOFF{{\]}} +; CHECK: ldr [[R2:x[0-9]+]], {{\[}}[[R1]]{{\]}} +; CHECK: stur [[R2]], {{\[}}x29, [[SLOT0:[0-9#\-]+]]{{\]}} +; CHECK: ldur [[R3:x[0-9]+]], {{\[}}x29, [[SLOT0]]{{\]}} +; CHECK: sub [[R4:x[0-9]+]], [[R2]], [[R3]] +; CHECK: cbnz [[R4]], LBB + +define i32 @test_stack_guard_remat2() { +entry: + %StackGuardSlot = alloca i8* + %StackGuard = load i8** bitcast (i64** @__stack_chk_guard to i8**) + call void @llvm.stackprotector(i8* %StackGuard, i8** %StackGuardSlot) + %container = alloca [32 x i8], align 1 + call void @llvm.stackprotectorcheck(i8** bitcast (i64** @__stack_chk_guard to i8**)) + ret i32 -1 +} + +declare void @llvm.stackprotector(i8*, i8**) +declare void @llvm.stackprotectorcheck(i8**) |
