47 lines
2.1 KiB
LLVM
47 lines
2.1 KiB
LLVM
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; To test that safestack does not break the musttail call contract.
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;
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; RUN: opt < %s --safe-stack -S | FileCheck %s
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target triple = "x86_64-unknown-linux-gnu"
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declare i32 @foo(i32* %p)
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declare void @alloca_test_use([10 x i8]*)
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define i32 @call_foo(i32* %a) safestack {
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; CHECK-LABEL: @call_foo(
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; CHECK-NEXT: [[UNSAFE_STACK_PTR:%.*]] = load i8*, i8** @__safestack_unsafe_stack_ptr, align 8
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; CHECK-NEXT: [[UNSAFE_STACK_STATIC_TOP:%.*]] = getelementptr i8, i8* [[UNSAFE_STACK_PTR]], i32 -16
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; CHECK-NEXT: store i8* [[UNSAFE_STACK_STATIC_TOP]], i8** @__safestack_unsafe_stack_ptr, align 8
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; CHECK-NEXT: [[TMP1:%.*]] = getelementptr i8, i8* [[UNSAFE_STACK_PTR]], i32 -10
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; CHECK-NEXT: [[X_UNSAFE:%.*]] = bitcast i8* [[TMP1]] to [10 x i8]*
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; CHECK-NEXT: call void @alloca_test_use([10 x i8]* [[X_UNSAFE]])
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; CHECK-NEXT: store i8* [[UNSAFE_STACK_PTR]], i8** @__safestack_unsafe_stack_ptr, align 8
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; CHECK-NEXT: [[R:%.*]] = musttail call i32 @foo(i32* [[A:%.*]])
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; CHECK-NEXT: ret i32 [[R]]
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;
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%x = alloca [10 x i8], align 1
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call void @alloca_test_use([10 x i8]* %x)
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%r = musttail call i32 @foo(i32* %a)
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ret i32 %r
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}
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define i32 @call_foo_cast(i32* %a) safestack {
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; CHECK-LABEL: @call_foo_cast(
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; CHECK-NEXT: [[UNSAFE_STACK_PTR:%.*]] = load i8*, i8** @__safestack_unsafe_stack_ptr, align 8
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; CHECK-NEXT: [[UNSAFE_STACK_STATIC_TOP:%.*]] = getelementptr i8, i8* [[UNSAFE_STACK_PTR]], i32 -16
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; CHECK-NEXT: store i8* [[UNSAFE_STACK_STATIC_TOP]], i8** @__safestack_unsafe_stack_ptr, align 8
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; CHECK-NEXT: [[TMP1:%.*]] = getelementptr i8, i8* [[UNSAFE_STACK_PTR]], i32 -10
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; CHECK-NEXT: [[X_UNSAFE:%.*]] = bitcast i8* [[TMP1]] to [10 x i8]*
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; CHECK-NEXT: call void @alloca_test_use([10 x i8]* [[X_UNSAFE]])
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; CHECK-NEXT: store i8* [[UNSAFE_STACK_PTR]], i8** @__safestack_unsafe_stack_ptr, align 8
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; CHECK-NEXT: [[R:%.*]] = musttail call i32 @foo(i32* [[A:%.*]])
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; CHECK-NEXT: [[T:%.*]] = bitcast i32 [[R]] to i32
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; CHECK-NEXT: ret i32 [[T]]
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;
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%x = alloca [10 x i8], align 1
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call void @alloca_test_use([10 x i8]* %x)
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%r = musttail call i32 @foo(i32* %a)
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%t = bitcast i32 %r to i32
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ret i32 %t
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}
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