derek.holloway
7502bf64a4
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216 lines
6.8 KiB
LLVM
216 lines
6.8 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 6
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; RUN: llc -mtriple=thumbv6m-none-eabi < %s | FileCheck %s
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; This test verifies that Thumb1 (ARMv6-M) generates correct code for backend KCFI.
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; Thumb1 uses the backend KCFI implementation with Thumb1-specific instructions.
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; Test function without KCFI annotation
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; CHECK-LABEL: .globl nosan
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; CHECK-NEXT: .p2align 1
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; CHECK-NEXT: .type nosan,%function
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; CHECK-NEXT: .code 16
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; CHECK-NEXT: .thumb_func
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define dso_local void @nosan() nounwind {
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; CHECK-LABEL: nosan:
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; CHECK: @ %bb.0:
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; CHECK-NEXT: bx lr
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ret void
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}
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; Test function with KCFI annotation - verifies type hash emission
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;; The alignment is at least 4 to avoid unaligned type hash loads when this
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;; instrumented function is indirectly called.
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; CHECK-LABEL: .globl target_func
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; CHECK-NEXT: .p2align 2
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; CHECK-NEXT: .type target_func,%function
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; CHECK-NEXT: .long 3170468932
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; CHECK-NEXT: .code 16
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; CHECK-NEXT: .thumb_func
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define void @target_func() !kcfi_type !1 {
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; CHECK-LABEL: target_func:
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; CHECK: @ %bb.0:
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; CHECK-NEXT: bx lr
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ret void
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}
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; Test indirect call with KCFI check using operand bundles
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; CHECK-LABEL: .globl f1
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; CHECK: .p2align 2
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; CHECK-NEXT: .type f1,%function
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; CHECK-NEXT: .long 3170468932
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; CHECK-NEXT: .code 16
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; CHECK-NEXT: .thumb_func
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define void @f1(ptr noundef %x) !kcfi_type !1 {
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; CHECK-LABEL: f1:
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; CHECK: @ %bb.0:
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; CHECK-NEXT: .save {r7, lr}
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; CHECK-NEXT: push {r7, lr}
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; CHECK-NEXT: movs r3, #1
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; CHECK-NEXT: mov r2, r0
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; CHECK-NEXT: bics r2, r3
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; CHECK-NEXT: subs r2, #4
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; CHECK-NEXT: ldr r2, [r2]
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; CHECK-NEXT: movs r3, #188
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; CHECK-NEXT: lsls r3, r3, #8
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; CHECK-NEXT: adds r3, #249
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; CHECK-NEXT: lsls r3, r3, #8
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; CHECK-NEXT: adds r3, #132
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; CHECK-NEXT: lsls r3, r3, #8
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; CHECK-NEXT: adds r3, #68
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; CHECK-NEXT: cmp r2, r3
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; CHECK-NEXT: beq .Ltmp0
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; CHECK-NEXT: bkpt #0
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; CHECK-NEXT: .Ltmp0:
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; CHECK-NEXT: blx r0
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; CHECK-NEXT: pop {r7, pc}
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call void %x() [ "kcfi"(i32 -1124498364) ]
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ret void
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}
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; Test with tail call - backend KCFI supports tail calls
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define void @f2(ptr noundef %x) !kcfi_type !1 {
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; CHECK-LABEL: f2:
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; CHECK: @ %bb.0:
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; CHECK-NEXT: .save {r7, lr}
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; CHECK-NEXT: push {r7, lr}
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; CHECK-NEXT: movs r3, #1
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; CHECK-NEXT: mov r2, r0
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; CHECK-NEXT: bics r2, r3
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; CHECK-NEXT: subs r2, #4
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; CHECK-NEXT: ldr r2, [r2]
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; CHECK-NEXT: movs r3, #188
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; CHECK-NEXT: lsls r3, r3, #8
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; CHECK-NEXT: adds r3, #249
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; CHECK-NEXT: lsls r3, r3, #8
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; CHECK-NEXT: adds r3, #132
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; CHECK-NEXT: lsls r3, r3, #8
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; CHECK-NEXT: adds r3, #68
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; CHECK-NEXT: cmp r2, r3
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; CHECK-NEXT: beq .Ltmp1
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; CHECK-NEXT: bkpt #0
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; CHECK-NEXT: .Ltmp1:
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; CHECK-NEXT: blx r0
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; CHECK-NEXT: pop {r7, pc}
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tail call void %x() [ "kcfi"(i32 -1124498364) ]
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ret void
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}
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; Test with R2 live (3 arguments) - compiler shuffles args, no spilling needed
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define void @f3_r2_live(ptr noundef %x, i32 %a, i32 %b, i32 %c) !kcfi_type !1 {
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; CHECK-LABEL: f3_r2_live:
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; CHECK: @ %bb.0:
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; CHECK-NEXT: .save {r4, lr}
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; CHECK-NEXT: push {r4, lr}
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; CHECK-NEXT: mov r4, r0
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; CHECK-NEXT: mov r0, r1
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; CHECK-NEXT: mov r1, r2
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; CHECK-NEXT: mov r2, r3
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; CHECK-NEXT: push {r2}
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; CHECK-NEXT: movs r3, #1
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; CHECK-NEXT: mov r2, r4
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; CHECK-NEXT: bics r2, r3
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; CHECK-NEXT: subs r2, #4
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; CHECK-NEXT: ldr r2, [r2]
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; CHECK-NEXT: movs r3, #188
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; CHECK-NEXT: lsls r3, r3, #8
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; CHECK-NEXT: adds r3, #249
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; CHECK-NEXT: lsls r3, r3, #8
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; CHECK-NEXT: adds r3, #132
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; CHECK-NEXT: lsls r3, r3, #8
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; CHECK-NEXT: adds r3, #68
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; CHECK-NEXT: cmp r2, r3
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; CHECK-NEXT: pop {r2}
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; CHECK-NEXT: beq .Ltmp2
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; CHECK-NEXT: bkpt #0
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; CHECK-NEXT: .Ltmp2:
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; CHECK-NEXT: blx r4
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; CHECK-NEXT: pop {r4, pc}
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; Compiler shuffles: target→r4, c→r2, a→r0, b→r1
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; R2 is live (3rd arg), so we push it, then uses R3 as temp, R2 as scratch
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call void %x(i32 %a, i32 %b, i32 %c) [ "kcfi"(i32 -1124498364) ]
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ret void
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}
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; Test with both R2 and R3 live (4 arguments) - compiler moves to r5/r4, uses R3 temp and R12 scratch
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define void @f4_r2_r3_live(ptr noundef %x, i32 %a, i32 %b, i32 %c, i32 %d) !kcfi_type !1 {
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; CHECK-LABEL: f4_r2_r3_live:
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; CHECK: @ %bb.0:
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; CHECK-NEXT: .save {r4, r5, r7, lr}
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; CHECK-NEXT: push {r4, r5, r7, lr}
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; CHECK-NEXT: mov r5, r3
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; CHECK-NEXT: mov r4, r0
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; CHECK-NEXT: ldr r3, [sp, #16]
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; CHECK-NEXT: mov r0, r1
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; CHECK-NEXT: mov r1, r2
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; CHECK-NEXT: mov r2, r5
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; CHECK-NEXT: push {r3}
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; CHECK-NEXT: push {r2}
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; CHECK-NEXT: movs r3, #1
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; CHECK-NEXT: mov r2, r4
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; CHECK-NEXT: bics r2, r3
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; CHECK-NEXT: subs r2, #4
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; CHECK-NEXT: ldr r2, [r2]
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; CHECK-NEXT: movs r3, #188
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; CHECK-NEXT: lsls r3, r3, #8
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; CHECK-NEXT: adds r3, #249
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; CHECK-NEXT: lsls r3, r3, #8
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; CHECK-NEXT: adds r3, #132
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; CHECK-NEXT: lsls r3, r3, #8
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; CHECK-NEXT: adds r3, #68
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; CHECK-NEXT: cmp r2, r3
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; CHECK-NEXT: pop {r2}
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; CHECK-NEXT: pop {r3}
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; CHECK-NEXT: beq .Ltmp3
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; CHECK-NEXT: bkpt #0
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; CHECK-NEXT: .Ltmp3:
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; CHECK-NEXT: blx r4
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; CHECK-NEXT: pop {r4, r5, r7, pc}
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; Compiler shuffles: r3→r5, target→r4, d→r3 (from stack), a→r0, b→r1, c→r2
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; Then pushes r3 (d value), then r2, uses R3 as temp, R2 as scratch
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call void %x(i32 %a, i32 %b, i32 %c, i32 %d) [ "kcfi"(i32 -1124498364) ]
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ret void
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}
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; Test where target ends up in R12, forcing R2 as scratch, with both R2 and R3 live
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; This uses inline asm to force target into R12, with 4 call arguments to make R2/R3 live
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define void @f5_r12_target_r2_r3_live(i32 %a, i32 %b, i32 %c, i32 %d) !kcfi_type !1 {
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; CHECK-LABEL: f5_r12_target_r2_r3_live:
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; CHECK: @ %bb.0:
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; CHECK-NEXT: .save {r7, lr}
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; CHECK-NEXT: push {r7, lr}
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; CHECK-NEXT: @APP
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; CHECK-NEXT: @NO_APP
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; CHECK-NEXT: push {r3}
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; CHECK-NEXT: push {r2}
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; CHECK-NEXT: movs r3, #1
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; CHECK-NEXT: mov r2, r12
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; CHECK-NEXT: bics r2, r3
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; CHECK-NEXT: subs r2, #4
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; CHECK-NEXT: ldr r2, [r2]
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; CHECK-NEXT: movs r3, #188
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; CHECK-NEXT: lsls r3, r3, #8
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; CHECK-NEXT: adds r3, #249
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; CHECK-NEXT: lsls r3, r3, #8
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; CHECK-NEXT: adds r3, #132
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; CHECK-NEXT: lsls r3, r3, #8
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; CHECK-NEXT: adds r3, #68
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; CHECK-NEXT: cmp r2, r3
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; CHECK-NEXT: pop {r2}
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; CHECK-NEXT: pop {r3}
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; CHECK-NEXT: beq .Ltmp4
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; CHECK-NEXT: bkpt #0
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; CHECK-NEXT: .Ltmp4:
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; CHECK-NEXT: blx r12
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; CHECK-NEXT: pop {r7, pc}
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; Use inline asm to get function pointer into R12
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; With 4 arguments (r0-r3), both R2 and R3 are live
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; Target in R12 means R2 is scratch, R3 is temp, and both need spilling
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%target = call ptr asm "", "={r12}"()
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call void %target(i32 %a, i32 %b, i32 %c, i32 %d) [ "kcfi"(i32 -1124498364) ]
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ret void
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}
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!llvm.module.flags = !{!0}
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!0 = !{i32 4, !"kcfi", i32 1}
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!1 = !{i32 -1124498364}
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