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llvm/test/CodeGen/ARM/stack_guard_remat.ll

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[stack protector] Fix a potential security bug in stack protector where the address of the stack guard was being spilled to the stack. Previously the address of the stack guard would get spilled to the stack if it was impossible to keep it in a register. This patch introduces a new target independent node and pseudo instruction which gets expanded post-RA to a sequence of instructions that load the stack guard value. Register allocator can now just remat the value when it can't keep it in a register. <rdar://problem/12475629> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@213967 91177308-0d34-0410-b5e6-96231b3b80d8
2014-07-25 19:31:34 +00:00
; RUN: llc < %s -mtriple=arm-apple-ios -relocation-model=pic -no-integrated-as | FileCheck %s -check-prefix=PIC
[ARM] In dynamic-no-pic mode, ARM's post-RA pseudo expansion was incorrectly expanding pseudo LOAD_STATCK_GUARD using instructions that are normally used in pic mode. This patch fixes the bug. <rdar://problem/17886592> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214614 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-02 05:40:40 +00:00
; RUN: llc < %s -mtriple=arm-apple-ios -relocation-model=static -no-integrated-as | FileCheck %s -check-prefix=NO-PIC -check-prefix=STATIC
; RUN: llc < %s -mtriple=arm-apple-ios -relocation-model=dynamic-no-pic -no-integrated-as | FileCheck %s -check-prefix=NO-PIC -check-prefix=DYNAMIC-NO-PIC
[stack protector] Fix a potential security bug in stack protector where the address of the stack guard was being spilled to the stack. Previously the address of the stack guard would get spilled to the stack if it was impossible to keep it in a register. This patch introduces a new target independent node and pseudo instruction which gets expanded post-RA to a sequence of instructions that load the stack guard value. Register allocator can now just remat the value when it can't keep it in a register. <rdar://problem/12475629> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@213967 91177308-0d34-0410-b5e6-96231b3b80d8
2014-07-25 19:31:34 +00:00
;PIC: foo2
;PIC: ldr [[R0:r[0-9]+]], [[LABEL0:LCPI[0-9_]+]]
;PIC: [[LABEL1:LPC0_1]]:
;PIC: ldr [[R1:r[0-9]+]], [pc, [[R0]]]
;PIC: ldr [[R2:r[0-9]+]], {{\[}}[[R1]]{{\]}}
;PIC: ldr {{r[0-9]+}}, {{\[}}[[R2]]{{\]}}
;PIC: [[LABEL0]]:
;PIC-NEXT: .long L___stack_chk_guard$non_lazy_ptr-([[LABEL1]]+8)
[ARM] In dynamic-no-pic mode, ARM's post-RA pseudo expansion was incorrectly expanding pseudo LOAD_STATCK_GUARD using instructions that are normally used in pic mode. This patch fixes the bug. <rdar://problem/17886592> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214614 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-02 05:40:40 +00:00
;NO-PIC: foo2
;NO-PIC: ldr [[R0:r[0-9]+]], [[LABEL0:LCPI[0-9_]+]]
;NO-PIC-NOT: LPC
;NO-PIC: ldr {{r[0-9]+}}, {{\[}}[[R0]]{{\]}}
[stack protector] Fix a potential security bug in stack protector where the address of the stack guard was being spilled to the stack. Previously the address of the stack guard would get spilled to the stack if it was impossible to keep it in a register. This patch introduces a new target independent node and pseudo instruction which gets expanded post-RA to a sequence of instructions that load the stack guard value. Register allocator can now just remat the value when it can't keep it in a register. <rdar://problem/12475629> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@213967 91177308-0d34-0410-b5e6-96231b3b80d8
2014-07-25 19:31:34 +00:00
;STATIC: [[LABEL0]]:
;STATIC-NEXT: .long ___stack_chk_guard
[ARM] In dynamic-no-pic mode, ARM's post-RA pseudo expansion was incorrectly expanding pseudo LOAD_STATCK_GUARD using instructions that are normally used in pic mode. This patch fixes the bug. <rdar://problem/17886592> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214614 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-02 05:40:40 +00:00
;DYNAMIC-NO-PIC: [[LABEL0]]:
;DYNAMIC-NO-PIC-NEXT: .long L___stack_chk_guard$non_lazy_ptr
[stack protector] Fix a potential security bug in stack protector where the address of the stack guard was being spilled to the stack. Previously the address of the stack guard would get spilled to the stack if it was impossible to keep it in a register. This patch introduces a new target independent node and pseudo instruction which gets expanded post-RA to a sequence of instructions that load the stack guard value. Register allocator can now just remat the value when it can't keep it in a register. <rdar://problem/12475629> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@213967 91177308-0d34-0410-b5e6-96231b3b80d8
2014-07-25 19:31:34 +00:00
; Function Attrs: nounwind ssp
define i32 @test_stack_guard_remat() #0 {
%a1 = alloca [256 x i32], align 4
%1 = bitcast [256 x i32]* %a1 to i8*
call void @llvm.lifetime.start(i64 1024, i8* %1)
%2 = getelementptr inbounds [256 x i32]* %a1, i32 0, i32 0
call void @foo3(i32* %2) #3
call void asm sideeffect "foo2", "~{r0},~{r1},~{r2},~{r3},~{r4},~{r5},~{r6},~{r7},~{r8},~{r9},~{r10},~{r11},~{r12},~{sp},~{lr}"()
call void @llvm.lifetime.end(i64 1024, i8* %1)
ret i32 0
}
; Function Attrs: nounwind
declare void @llvm.lifetime.start(i64, i8* nocapture)
declare void @foo3(i32*)
; Function Attrs: nounwind
declare void @llvm.lifetime.end(i64, i8* nocapture)
attributes #0 = { nounwind ssp "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
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