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; RUN: opt -safe-stack -S -mtriple=i386-pc-linux-gnu < %s -o - | FileCheck %s
; RUN: opt -safe-stack -S -mtriple=i386-pc-contiki-unknown < %s -o - | FileCheck -check-prefix=SINGLE-THREAD %s
; RUN: opt -safe-stack -S -mtriple=x86_64-pc-linux-gnu < %s -o - | FileCheck %s
; array [4 x i8]
; Requires protector.
; CHECK: @__safestack_unsafe_stack_ptr = external thread_local(initialexec) global ptr
; SINGLE-THREAD: @__safestack_unsafe_stack_ptr = external global ptr
define void @foo(ptr %a) nounwind uwtable safestack {
entry:
; CHECK: %[[USP:.*]] = load ptr, ptr @__safestack_unsafe_stack_ptr
; CHECK: %[[USST:.*]] = getelementptr i8, ptr %[[USP]], i32 -16
; CHECK: store ptr %[[USST]], ptr @__safestack_unsafe_stack_ptr
%a.addr = alloca ptr, align 8
%buf = alloca [4 x i8], align 1
; CHECK: %[[AADDR:.*]] = alloca ptr, align 8
; CHECK: store ptr {{.*}}, ptr %[[AADDR]], align 8
store ptr %a, ptr %a.addr, align 8
; CHECK: %[[A2:.*]] = load ptr, ptr %[[AADDR]], align 8
; CHECK: %[[BUFPTR:.*]] = getelementptr i8, ptr %[[USP]], i32 -4
%a2 = load ptr, ptr %a.addr, align 8
; CHECK: call ptr @strcpy(ptr %[[BUFPTR]], ptr %[[A2]])
%call = call ptr @strcpy(ptr %buf, ptr %a2)
; CHECK: store ptr %[[USP]], ptr @__safestack_unsafe_stack_ptr
ret void
}
; Load from an array at a fixed offset, no overflow.
define i8 @StaticArrayFixedSafe() nounwind uwtable safestack {
entry:
; CHECK-LABEL: define i8 @StaticArrayFixedSafe(
; CHECK-NOT: __safestack_unsafe_stack_ptr
; CHECK: ret i8
%buf = alloca i8, i32 4, align 1
%gep = getelementptr inbounds i8, ptr %buf, i32 2
%x = load i8, ptr %gep, align 1
ret i8 %x
}
; Load from an array at a fixed offset with overflow.
define i8 @StaticArrayFixedUnsafe() nounwind uwtable safestack {
entry:
; CHECK-LABEL: define i8 @StaticArrayFixedUnsafe(
; CHECK: __safestack_unsafe_stack_ptr
; CHECK: ret i8
%buf = alloca i8, i32 4, align 1
%gep = getelementptr inbounds i8, ptr %buf, i32 5
%x = load i8, ptr %gep, align 1
ret i8 %x
}
; Load from an array at an unknown offset.
define i8 @StaticArrayVariableUnsafe(i32 %ofs) nounwind uwtable safestack {
entry:
; CHECK-LABEL: define i8 @StaticArrayVariableUnsafe(
; CHECK: __safestack_unsafe_stack_ptr
; CHECK: ret i8
%buf = alloca i8, i32 4, align 1
%gep = getelementptr inbounds i8, ptr %buf, i32 %ofs
%x = load i8, ptr %gep, align 1
ret i8 %x
}
; Load from an array of an unknown size.
define i8 @DynamicArrayUnsafe(i32 %sz) nounwind uwtable safestack {
entry:
; CHECK-LABEL: define i8 @DynamicArrayUnsafe(
; CHECK: __safestack_unsafe_stack_ptr
; CHECK: ret i8
%buf = alloca i8, i32 %sz, align 1
%gep = getelementptr inbounds i8, ptr %buf, i32 2
%x = load i8, ptr %gep, align 1
ret i8 %x
}
declare ptr @strcpy(ptr, ptr)
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