1; RUN: opt -safe-stack -S -mtriple=i386-pc-linux-gnu < %s -o - | FileCheck %s 2; RUN: opt -safe-stack -S -mtriple=i386-pc-contiki-unknown < %s -o - | FileCheck -check-prefix=SINGLE-THREAD %s 3; RUN: opt -safe-stack -S -mtriple=x86_64-pc-linux-gnu < %s -o - | FileCheck %s 4 5; array [4 x i8] 6; Requires protector. 7 8; CHECK: @__safestack_unsafe_stack_ptr = external thread_local(initialexec) global i8* 9; SINGLE-THREAD: @__safestack_unsafe_stack_ptr = external global i8* 10 11define void @foo(i8* %a) nounwind uwtable safestack { 12entry: 13 ; CHECK: %[[USP:.*]] = load i8*, i8** @__safestack_unsafe_stack_ptr 14 15 ; CHECK: %[[USST:.*]] = getelementptr i8, i8* %[[USP]], i32 -16 16 17 ; CHECK: store i8* %[[USST]], i8** @__safestack_unsafe_stack_ptr 18 19 %a.addr = alloca i8*, align 8 20 %buf = alloca [4 x i8], align 1 21 22 ; CHECK: %[[AADDR:.*]] = alloca i8*, align 8 23 ; CHECK: store i8* {{.*}}, i8** %[[AADDR]], align 8 24 store i8* %a, i8** %a.addr, align 8 25 26 ; CHECK: %[[BUFPTR:.*]] = getelementptr i8, i8* %[[USP]], i32 -4 27 ; CHECK: %[[BUFPTR2:.*]] = bitcast i8* %[[BUFPTR]] to [4 x i8]* 28 ; CHECK: %[[GEP:.*]] = getelementptr inbounds [4 x i8], [4 x i8]* %[[BUFPTR2]], i32 0, i32 0 29 %gep = getelementptr inbounds [4 x i8], [4 x i8]* %buf, i32 0, i32 0 30 31 ; CHECK: %[[A2:.*]] = load i8*, i8** %[[AADDR]], align 8 32 %a2 = load i8*, i8** %a.addr, align 8 33 34 ; CHECK: call i8* @strcpy(i8* %[[GEP]], i8* %[[A2]]) 35 %call = call i8* @strcpy(i8* %gep, i8* %a2) 36 37 ; CHECK: store i8* %[[USP]], i8** @__safestack_unsafe_stack_ptr 38 ret void 39} 40 41; Load from an array at a fixed offset, no overflow. 42define i8 @StaticArrayFixedSafe() nounwind uwtable safestack { 43entry: 44 ; CHECK-LABEL: define i8 @StaticArrayFixedSafe( 45 ; CHECK-NOT: __safestack_unsafe_stack_ptr 46 ; CHECK: ret i8 47 %buf = alloca i8, i32 4, align 1 48 %gep = getelementptr inbounds i8, i8* %buf, i32 2 49 %x = load i8, i8* %gep, align 1 50 ret i8 %x 51} 52 53; Load from an array at a fixed offset with overflow. 54define i8 @StaticArrayFixedUnsafe() nounwind uwtable safestack { 55entry: 56 ; CHECK-LABEL: define i8 @StaticArrayFixedUnsafe( 57 ; CHECK: __safestack_unsafe_stack_ptr 58 ; CHECK: ret i8 59 %buf = alloca i8, i32 4, align 1 60 %gep = getelementptr inbounds i8, i8* %buf, i32 5 61 %x = load i8, i8* %gep, align 1 62 ret i8 %x 63} 64 65; Load from an array at an unknown offset. 66define i8 @StaticArrayVariableUnsafe(i32 %ofs) nounwind uwtable safestack { 67entry: 68 ; CHECK-LABEL: define i8 @StaticArrayVariableUnsafe( 69 ; CHECK: __safestack_unsafe_stack_ptr 70 ; CHECK: ret i8 71 %buf = alloca i8, i32 4, align 1 72 %gep = getelementptr inbounds i8, i8* %buf, i32 %ofs 73 %x = load i8, i8* %gep, align 1 74 ret i8 %x 75} 76 77; Load from an array of an unknown size. 78define i8 @DynamicArrayUnsafe(i32 %sz) nounwind uwtable safestack { 79entry: 80 ; CHECK-LABEL: define i8 @DynamicArrayUnsafe( 81 ; CHECK: __safestack_unsafe_stack_ptr 82 ; CHECK: ret i8 83 %buf = alloca i8, i32 %sz, align 1 84 %gep = getelementptr inbounds i8, i8* %buf, i32 2 85 %x = load i8, i8* %gep, align 1 86 ret i8 %x 87} 88 89declare i8* @strcpy(i8*, i8*) 90