152 lines
4.9 KiB
LLVM
152 lines
4.9 KiB
LLVM
; RUN: llc < %s -mtriple=arm-pc-windows-msvc | FileCheck %s
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; Control Flow Guard is currently only available on Windows
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; Test that Control Flow Guard checks are correctly added when required.
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declare i32 @target_func()
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; Test that Control Flow Guard checks are not added on calls with the "guard_nocf" attribute.
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define i32 @func_guard_nocf() #0 {
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entry:
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%func_ptr = alloca i32 ()*, align 8
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store i32 ()* @target_func, i32 ()** %func_ptr, align 8
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%0 = load i32 ()*, i32 ()** %func_ptr, align 8
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%1 = call arm_aapcs_vfpcc i32 %0() #1
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ret i32 %1
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; CHECK-LABEL: func_guard_nocf
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; CHECK: movw r0, :lower16:target_func
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; CHECK: movt r0, :upper16:target_func
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; CHECK-NOT: __guard_check_icall_fptr
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; CHECK: blx r0
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}
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attributes #0 = { "target-cpu"="cortex-a9" "target-features"="+armv7-a,+dsp,+fp16,+neon,+strict-align,+thumb-mode,+vfp3"}
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attributes #1 = { "guard_nocf" }
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; Test that Control Flow Guard checks are added even at -O0.
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define i32 @func_optnone_cf() #2 {
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entry:
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%func_ptr = alloca i32 ()*, align 8
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store i32 ()* @target_func, i32 ()** %func_ptr, align 8
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%0 = load i32 ()*, i32 ()** %func_ptr, align 8
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%1 = call i32 %0()
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ret i32 %1
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; The call to __guard_check_icall_fptr should come immediately before the call to the target function.
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; CHECK-LABEL: func_optnone_cf
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; CHECK: movw r0, :lower16:target_func
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; CHECK: movt r0, :upper16:target_func
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; CHECK: str r0, [sp]
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; CHECK: ldr r4, [sp]
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; CHECK: movw r0, :lower16:__guard_check_icall_fptr
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; CHECK: movt r0, :upper16:__guard_check_icall_fptr
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; CHECK: ldr r1, [r0]
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; CHECK: mov r0, r4
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; CHECK: blx r1
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; CHECK-NEXT: blx r4
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}
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attributes #2 = { noinline optnone "target-cpu"="cortex-a9" "target-features"="+armv7-a,+dsp,+fp16,+neon,+strict-align,+thumb-mode,+vfp3"}
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; Test that Control Flow Guard checks are correctly added in optimized code (common case).
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define i32 @func_cf() #0 {
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entry:
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%func_ptr = alloca i32 ()*, align 8
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store i32 ()* @target_func, i32 ()** %func_ptr, align 8
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%0 = load i32 ()*, i32 ()** %func_ptr, align 8
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%1 = call i32 %0()
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ret i32 %1
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; The call to __guard_check_icall_fptr should come immediately before the call to the target function.
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; CHECK-LABEL: func_cf
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; CHECK: movw r0, :lower16:__guard_check_icall_fptr
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; CHECK: movt r0, :upper16:__guard_check_icall_fptr
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; CHECK: ldr r1, [r0]
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; CHECK: movw r4, :lower16:target_func
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; CHECK: movt r4, :upper16:target_func
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; CHECK: mov r0, r4
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; CHECK: blx r1
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; CHECK-NEXT: blx r4
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}
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; Test that Control Flow Guard checks are correctly added on invoke instructions.
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define i32 @func_cf_invoke() #0 personality i8* bitcast (void ()* @h to i8*) {
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entry:
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%0 = alloca i32, align 4
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%func_ptr = alloca i32 ()*, align 8
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store i32 ()* @target_func, i32 ()** %func_ptr, align 8
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%1 = load i32 ()*, i32 ()** %func_ptr, align 8
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%2 = invoke i32 %1()
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to label %invoke.cont unwind label %lpad
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invoke.cont: ; preds = %entry
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ret i32 %2
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lpad: ; preds = %entry
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%tmp = landingpad { i8*, i32 }
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catch i8* null
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ret i32 -1
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; The call to __guard_check_icall_fptr should come immediately before the call to the target function.
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; CHECK-LABEL: func_cf_invoke
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; CHECK: movw r0, :lower16:__guard_check_icall_fptr
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; CHECK: movt r0, :upper16:__guard_check_icall_fptr
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; CHECK: ldr r1, [r0]
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; CHECK: movw r4, :lower16:target_func
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; CHECK: movt r4, :upper16:target_func
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; CHECK: mov r0, r4
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; CHECK: blx r1
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; CHECK-NEXT: $Mtmp0:
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; CHECK-NEXT: blx r4
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; CHECK: ; %invoke.cont
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; CHECK: ; %lpad
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}
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declare void @h()
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; Test that longjmp targets have public labels and are included in the .gljmp section.
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%struct._SETJMP_FLOAT128 = type { [2 x i64] }
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@buf1 = internal global [16 x %struct._SETJMP_FLOAT128] zeroinitializer, align 16
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define i32 @func_cf_setjmp() #0 {
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%1 = alloca i32, align 4
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%2 = alloca i32, align 4
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store i32 0, i32* %1, align 4
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store i32 -1, i32* %2, align 4
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%3 = call i8* @llvm.frameaddress(i32 0)
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%4 = call i32 @_setjmp(i8* bitcast ([16 x %struct._SETJMP_FLOAT128]* @buf1 to i8*), i8* %3) #3
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; CHECK-LABEL: func_cf_setjmp
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; CHECK: bl _setjmp
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; CHECK-NEXT: $cfgsj_func_cf_setjmp0:
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%5 = call i8* @llvm.frameaddress(i32 0)
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%6 = call i32 @_setjmp(i8* bitcast ([16 x %struct._SETJMP_FLOAT128]* @buf1 to i8*), i8* %5) #3
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; CHECK: bl _setjmp
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; CHECK-NEXT: $cfgsj_func_cf_setjmp1:
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store i32 1, i32* %2, align 4
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%7 = load i32, i32* %2, align 4
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ret i32 %7
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; CHECK: .section .gljmp$y,"dr"
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; CHECK-NEXT: .symidx $cfgsj_func_cf_setjmp0
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; CHECK-NEXT: .symidx $cfgsj_func_cf_setjmp1
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}
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declare i8* @llvm.frameaddress(i32)
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; Function Attrs: returns_twice
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declare dso_local i32 @_setjmp(i8*, i8*) #3
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attributes #3 = { returns_twice }
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!llvm.module.flags = !{!0}
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!0 = !{i32 2, !"cfguard", i32 2}
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