derek.holloway
7502bf64a4
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114 lines
4.6 KiB
LLVM
114 lines
4.6 KiB
LLVM
; RUN: llc -mtriple aarch64 -o - %s \
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; RUN: -aarch64-authenticated-lr-check-method=xpac-hint \
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; RUN: -stop-before=aarch64-ptrauth \
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; RUN: | FileCheck --check-prefix=MIR %s
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; RUN: llc -mtriple aarch64 -o - %s -asm-verbose=0 \
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; RUN: -aarch64-authenticated-lr-check-method=xpac-hint \
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; RUN: | FileCheck --check-prefix=ASM %s
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target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128-Fn32"
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;; Test that expansion of AUTH_TCRETURN does not crash due to unavailability of
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;; neither x16 nor x17 as a scratch register.
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define i32 @test_scratch_reg_nobti(ptr %callee, ptr %addr) #0 {
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entry:
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;; Force spilling of LR
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tail call void asm sideeffect "", "~{lr}"()
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;; Clobber x0-x15 and x18-x29. This is rather fragile but it was observed to
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;; trick regalloc into allocating both x16 and x17 as inputs of AUTH_TCRETURN.
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tail call void asm sideeffect "", "~{x0},~{x1},~{x2},~{x3},~{x4},~{x5},~{x6},~{x7},~{x8},~{x9},~{x10},~{x11},~{x12},~{x13},~{x14},~{x15}"()
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tail call void asm sideeffect "", "~{x18},~{x19},~{x20},~{x21},~{x22},~{x23},~{x24},~{x25},~{x26},~{x27},~{x28},~{fp}"()
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%addr.i = ptrtoint ptr %addr to i64
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%call = tail call i32 %callee() #1 [ "ptrauth"(i32 0, i64 %addr.i) ]
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ret i32 %call
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}
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;; Ensure the specific tail call pseudo instruction is used.
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; MIR-LABEL: name: test_scratch_reg_nobti
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; MIR: AUTH_TCRETURN{{ }}
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;
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; ASM-LABEL: test_scratch_reg_nobti:
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; ASM-NEXT: pacibsp
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; ASM-NEXT: sub sp, sp, #112
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; ASM-NEXT: stp x29, x30, [sp, #16]
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; ASM-NEXT: mov x16, x1
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; ASM-NEXT: stp x28, x27, [sp, #32]
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; ASM-NEXT: stp x26, x25, [sp, #48]
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; ASM-NEXT: stp x24, x23, [sp, #64]
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; ASM-NEXT: stp x22, x21, [sp, #80]
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; ASM-NEXT: stp x20, x19, [sp, #96]
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; ASM-NEXT: str x0, [sp, #8]
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; ASM-NEXT: //APP
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; ASM-NEXT: //NO_APP
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; ASM-NEXT: //APP
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; ASM-NEXT: //NO_APP
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; ASM-NEXT: //APP
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; ASM-NEXT: //NO_APP
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; ASM-NEXT: ldr x0, [sp, #8]
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; ASM-NEXT: ldp x20, x19, [sp, #96]
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; ASM-NEXT: ldp x22, x21, [sp, #80]
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; ASM-NEXT: ldp x24, x23, [sp, #64]
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; ASM-NEXT: ldp x26, x25, [sp, #48]
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; ASM-NEXT: ldp x28, x27, [sp, #32]
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; ASM-NEXT: ldp x29, x30, [sp, #16]
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; ASM-NEXT: add sp, sp, #112
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; ASM-NEXT: autibsp
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; ASM-NEXT: eor x17, x30, x30, lsl #1
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; ASM-NEXT: tbz x17, #62, .Lauth_success_0
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; ASM-NEXT: brk #0xc471
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; ASM-NEXT: .Lauth_success_0:
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; ASM-NEXT: braa x0, x16
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; ASM-NEXT: .Lfunc_end0:
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;; The same for AUTH_TCRETURN_BTI.
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define i32 @test_scratch_reg_bti(ptr %callee, ptr %addr) "branch-target-enforcement" #0 {
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entry:
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;; Force spilling of LR
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tail call void asm sideeffect "", "~{lr}"()
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;; Clobber x0-x15 and x18-x29. This is rather fragile but it was observed to
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;; trick regalloc into allocating both x16 and x17 as inputs of AUTH_TCRETURN_BTI.
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tail call void asm sideeffect "", "~{x0},~{x1},~{x2},~{x3},~{x4},~{x5},~{x6},~{x7},~{x8},~{x9},~{x10},~{x11},~{x12},~{x13},~{x14},~{x15}"()
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tail call void asm sideeffect "", "~{x18},~{x19},~{x20},~{x21},~{x22},~{x23},~{x24},~{x25},~{x26},~{x27},~{x28},~{fp}"()
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%addr.i = ptrtoint ptr %addr to i64
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%call = tail call i32 %callee() #1 [ "ptrauth"(i32 0, i64 %addr.i) ]
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ret i32 %call
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}
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;; Ensure the specific tail call pseudo instruction is used.
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; MIR-LABEL: name: test_scratch_reg_bti
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; MIR: AUTH_TCRETURN_BTI
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;
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; ASM-LABEL: test_scratch_reg_bti:
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; ASM-NEXT: pacibsp
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; ASM-NEXT: sub sp, sp, #112
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; ASM-NEXT: stp x29, x30, [sp, #16]
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; ASM-NEXT: mov x16, x0
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; ASM-NEXT: stp x28, x27, [sp, #32]
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; ASM-NEXT: stp x26, x25, [sp, #48]
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; ASM-NEXT: stp x24, x23, [sp, #64]
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; ASM-NEXT: stp x22, x21, [sp, #80]
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; ASM-NEXT: stp x20, x19, [sp, #96]
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; ASM-NEXT: str x1, [sp, #8]
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; ASM-NEXT: //APP
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; ASM-NEXT: //NO_APP
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; ASM-NEXT: //APP
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; ASM-NEXT: //NO_APP
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; ASM-NEXT: //APP
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; ASM-NEXT: //NO_APP
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; ASM-NEXT: ldr x0, [sp, #8]
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; ASM-NEXT: ldp x20, x19, [sp, #96]
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; ASM-NEXT: ldp x22, x21, [sp, #80]
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; ASM-NEXT: ldp x24, x23, [sp, #64]
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; ASM-NEXT: ldp x26, x25, [sp, #48]
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; ASM-NEXT: ldp x28, x27, [sp, #32]
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; ASM-NEXT: ldp x29, x30, [sp, #16]
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; ASM-NEXT: add sp, sp, #112
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; ASM-NEXT: autibsp
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; ASM-NEXT: eor x17, x30, x30, lsl #1
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; ASM-NEXT: tbz x17, #62, .Lauth_success_1
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; ASM-NEXT: brk #0xc471
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; ASM-NEXT: .Lauth_success_1:
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; ASM-NEXT: braa x16, x0
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; ASM-NEXT: .Lfunc_end1:
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attributes #0 = { nounwind "ptrauth-auth-traps" "ptrauth-calls" "ptrauth-returns" "target-features"="+pauth" }
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