| ; RUN: llc < %s -mtriple=aarch64-pc-windows-msvc | FileCheck %s |
| ; Control Flow Guard is currently only available on Windows |
| |
| ; Test that Control Flow Guard checks are correctly added when required. |
| |
| |
| declare i32 @target_func() |
| |
| |
| ; Test that Control Flow Guard checks are not added on calls with the "guard_nocf" attribute. |
| define i32 @func_guard_nocf() { |
| entry: |
| %func_ptr = alloca i32 ()*, align 8 |
| store i32 ()* @target_func, i32 ()** %func_ptr, align 8 |
| %0 = load i32 ()*, i32 ()** %func_ptr, align 8 |
| %1 = call i32 %0() #0 |
| ret i32 %1 |
| |
| ; CHECK-LABEL: func_guard_nocf |
| ; CHECK: adrp x8, target_func |
| ; CHECK: add x8, x8, :lo12:target_func |
| ; CHECK-NOT: __guard_check_icall_fptr |
| ; CHECK: blr x8 |
| } |
| attributes #0 = { "guard_nocf" } |
| |
| |
| ; Test that Control Flow Guard checks are added even at -O0. |
| define i32 @func_optnone_cf() #1 { |
| entry: |
| %func_ptr = alloca i32 ()*, align 8 |
| store i32 ()* @target_func, i32 ()** %func_ptr, align 8 |
| %0 = load i32 ()*, i32 ()** %func_ptr, align 8 |
| %1 = call i32 %0() |
| ret i32 %1 |
| |
| ; The call to __guard_check_icall_fptr should come immediately before the call to the target function. |
| ; CHECK-LABEL: func_optnone_cf |
| ; CHECK: adrp x8, target_func |
| ; CHECK: add x8, x8, :lo12:target_func |
| ; CHECK: adrp x9, __guard_check_icall_fptr |
| ; CHECK: add x9, x9, :lo12:__guard_check_icall_fptr |
| ; CHECK: ldr x9, [x9] |
| ; CHECK: mov x15, x8 |
| ; CHECK: blr x9 |
| ; CHECK-NEXT: blr x8 |
| } |
| attributes #1 = { noinline optnone } |
| |
| |
| ; Test that Control Flow Guard checks are correctly added in optimized code (common case). |
| define i32 @func_cf() { |
| entry: |
| %func_ptr = alloca i32 ()*, align 8 |
| store i32 ()* @target_func, i32 ()** %func_ptr, align 8 |
| %0 = load i32 ()*, i32 ()** %func_ptr, align 8 |
| %1 = call i32 %0() |
| ret i32 %1 |
| |
| ; The call to __guard_check_icall_fptr should come immediately before the call to the target function. |
| ; CHECK-LABEL: func_cf |
| ; CHECK: adrp x8, __guard_check_icall_fptr |
| ; CHECK: ldr x9, [x8, :lo12:__guard_check_icall_fptr] |
| ; CHECK: adrp x8, target_func |
| ; CHECK: add x8, x8, :lo12:target_func |
| ; CHECK: mov x15, x8 |
| ; CHECK: blr x9 |
| ; CHECK-NEXT: blr x8 |
| } |
| |
| |
| ; Test that Control Flow Guard checks are correctly added on invoke instructions. |
| define i32 @func_cf_invoke() personality i8* bitcast (void ()* @h to i8*) { |
| entry: |
| %0 = alloca i32, align 4 |
| %func_ptr = alloca i32 ()*, align 8 |
| store i32 ()* @target_func, i32 ()** %func_ptr, align 8 |
| %1 = load i32 ()*, i32 ()** %func_ptr, align 8 |
| %2 = invoke i32 %1() |
| to label %invoke.cont unwind label %lpad |
| invoke.cont: ; preds = %entry |
| ret i32 %2 |
| |
| lpad: ; preds = %entry |
| %tmp = landingpad { i8*, i32 } |
| catch i8* null |
| ret i32 -1 |
| |
| ; The call to __guard_check_icall_fptr should come immediately before the call to the target function. |
| ; CHECK-LABEL: func_cf_invoke |
| ; CHECK: adrp x8, __guard_check_icall_fptr |
| ; CHECK: ldr x9, [x8, :lo12:__guard_check_icall_fptr] |
| ; CHECK: adrp x8, target_func |
| ; CHECK: add x8, x8, :lo12:target_func |
| ; CHECK: mov x15, x8 |
| ; CHECK: blr x9 |
| ; CHECK-NEXT: .Ltmp0: |
| ; CHECK-NEXT: blr x8 |
| ; CHECK: // %invoke.cont |
| ; CHECK: // %lpad |
| } |
| |
| declare void @h() |
| |
| |
| ; Test that longjmp targets have public labels and are included in the .gljmp section. |
| %struct._SETJMP_FLOAT128 = type { [2 x i64] } |
| @buf1 = internal global [16 x %struct._SETJMP_FLOAT128] zeroinitializer, align 16 |
| |
| define i32 @func_cf_setjmp() { |
| %1 = alloca i32, align 4 |
| %2 = alloca i32, align 4 |
| store i32 0, i32* %1, align 4 |
| store i32 -1, i32* %2, align 4 |
| %3 = call i8* @llvm.frameaddress(i32 0) |
| %4 = call i32 @_setjmp(i8* bitcast ([16 x %struct._SETJMP_FLOAT128]* @buf1 to i8*), i8* %3) #2 |
| |
| ; CHECK-LABEL: func_cf_setjmp |
| ; CHECK: bl _setjmp |
| ; CHECK-NEXT: $cfgsj_func_cf_setjmp0: |
| |
| %5 = call i8* @llvm.frameaddress(i32 0) |
| %6 = call i32 @_setjmp(i8* bitcast ([16 x %struct._SETJMP_FLOAT128]* @buf1 to i8*), i8* %5) #3 |
| |
| ; CHECK: bl _setjmp |
| ; CHECK-NEXT: $cfgsj_func_cf_setjmp1: |
| |
| store i32 1, i32* %2, align 4 |
| %7 = load i32, i32* %2, align 4 |
| ret i32 %7 |
| |
| ; CHECK: .section .gljmp$y,"dr" |
| ; CHECK-NEXT: .symidx $cfgsj_func_cf_setjmp0 |
| ; CHECK-NEXT: .symidx $cfgsj_func_cf_setjmp1 |
| } |
| |
| declare i8* @llvm.frameaddress(i32) |
| |
| ; Function Attrs: returns_twice |
| declare dso_local i32 @_setjmp(i8*, i8*) #2 |
| |
| attributes #2 = { returns_twice } |
| attributes #3 = { returns_twice } |
| |
| |
| !llvm.module.flags = !{!0} |
| !0 = !{i32 2, !"cfguard", i32 2} |