1; RUN: opt -safe-stack -S -mtriple=i386-pc-linux-gnu < %s -o - | FileCheck %s 2; RUN: opt -safe-stack -safe-stack-usp-storage=single-thread -S -mtriple=i386-pc-linux-gnu < %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; RUN: opt -safe-stack -safe-stack-usp-storage=single-thread -S -mtriple=x86_64-pc-linux-gnu < %s -o - | FileCheck -check-prefix=SINGLE-THREAD %s 5 6; array [4 x i8] 7; Requires protector. 8 9; CHECK: @__safestack_unsafe_stack_ptr = external thread_local(initialexec) global i8* 10; SINGLE-THREAD: @__safestack_unsafe_stack_ptr = external global i8* 11 12define void @foo(i8* %a) nounwind uwtable safestack { 13entry: 14 ; CHECK: %[[USP:.*]] = load i8*, i8** @__safestack_unsafe_stack_ptr 15 16 ; CHECK: %[[USST:.*]] = getelementptr i8, i8* %[[USP]], i32 -16 17 18 ; CHECK: store i8* %[[USST]], i8** @__safestack_unsafe_stack_ptr 19 20 ; CHECK: %[[AADDR:.*]] = alloca i8*, align 8 21 %a.addr = alloca i8*, align 8 22 23 ; CHECK: %[[BUFPTR:.*]] = getelementptr i8, i8* %[[USP]], i32 -4 24 ; CHECK: %[[BUFPTR2:.*]] = bitcast i8* %[[BUFPTR]] to [4 x i8]* 25 %buf = alloca [4 x i8], align 1 26 27 ; CHECK: store i8* {{.*}}, i8** %[[AADDR]], align 8 28 store i8* %a, i8** %a.addr, align 8 29 30 ; CHECK: %[[GEP:.*]] = getelementptr inbounds [4 x i8], [4 x i8]* %[[BUFPTR2]], i32 0, i32 0 31 %gep = getelementptr inbounds [4 x i8], [4 x i8]* %buf, i32 0, i32 0 32 33 ; CHECK: %[[A2:.*]] = load i8*, i8** %[[AADDR]], align 8 34 %a2 = load i8*, i8** %a.addr, align 8 35 36 ; CHECK: call i8* @strcpy(i8* %[[GEP]], i8* %[[A2]]) 37 %call = call i8* @strcpy(i8* %gep, i8* %a2) 38 39 ; CHECK: store i8* %[[USP]], i8** @__safestack_unsafe_stack_ptr 40 ret void 41} 42 43; Load from an array at a fixed offset, no overflow. 44define i8 @StaticArrayFixedSafe() nounwind uwtable safestack { 45entry: 46 ; CHECK-LABEL: define i8 @StaticArrayFixedSafe( 47 ; CHECK-NOT: __safestack_unsafe_stack_ptr 48 ; CHECK: ret i8 49 %buf = alloca i8, i32 4, align 1 50 %gep = getelementptr inbounds i8, i8* %buf, i32 2 51 %x = load i8, i8* %gep, align 1 52 ret i8 %x 53} 54 55; Load from an array at a fixed offset with overflow. 56define i8 @StaticArrayFixedUnsafe() nounwind uwtable safestack { 57entry: 58 ; CHECK-LABEL: define i8 @StaticArrayFixedUnsafe( 59 ; CHECK: __safestack_unsafe_stack_ptr 60 ; CHECK: ret i8 61 %buf = alloca i8, i32 4, align 1 62 %gep = getelementptr inbounds i8, i8* %buf, i32 5 63 %x = load i8, i8* %gep, align 1 64 ret i8 %x 65} 66 67; Load from an array at an unknown offset. 68define i8 @StaticArrayVariableUnsafe(i32 %ofs) nounwind uwtable safestack { 69entry: 70 ; CHECK-LABEL: define i8 @StaticArrayVariableUnsafe( 71 ; CHECK: __safestack_unsafe_stack_ptr 72 ; CHECK: ret i8 73 %buf = alloca i8, i32 4, align 1 74 %gep = getelementptr inbounds i8, i8* %buf, i32 %ofs 75 %x = load i8, i8* %gep, align 1 76 ret i8 %x 77} 78 79; Load from an array of an unknown size. 80define i8 @DynamicArrayUnsafe(i32 %sz) nounwind uwtable safestack { 81entry: 82 ; CHECK-LABEL: define i8 @DynamicArrayUnsafe( 83 ; CHECK: __safestack_unsafe_stack_ptr 84 ; CHECK: ret i8 85 %buf = alloca i8, i32 %sz, align 1 86 %gep = getelementptr inbounds i8, i8* %buf, i32 2 87 %x = load i8, i8* %gep, align 1 88 ret i8 %x 89} 90 91declare i8* @strcpy(i8*, i8*) 92