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[win][aarch64] Always reserve frame pointers for Arm64 Windows (#146582)
There is no way in Arm64 Windows to indicate that a given function has used the Frame Pointer as a General Purpose Register, as such stack walks will always assume that the frame chain is valid and will follow whatever value has been saved for the Frame Pointer (even if it is pointing to data, etc.). This change makes the Frame Pointer always reserved when building for Arm64 Windows to avoid this issue. We will be updating the official Windows ABI documentation to reflect this requirement, and I will provide a link once it's available.
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10 files changed

+131
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‎clang/lib/Driver/ToolChains/CommonArgs.cpp

Lines changed: 13 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -174,7 +174,13 @@ static bool mustUseNonLeafFramePointerForTarget(const llvm::Triple &Triple) {
174174
// even if new frame records are not created.
175175
static bool mustMaintainValidFrameChain(const llvm::opt::ArgList &Args,
176176
const llvm::Triple &Triple) {
177-
if (Triple.isARM() || Triple.isThumb()) {
177+
switch (Triple.getArch()) {
178+
default:
179+
return false;
180+
case llvm::Triple::arm:
181+
case llvm::Triple::armeb:
182+
case llvm::Triple::thumb:
183+
case llvm::Triple::thumbeb:
178184
// For 32-bit Arm, the -mframe-chain=aapcs and -mframe-chain=aapcs+leaf
179185
// options require the frame pointer register to be reserved (or point to a
180186
// new AAPCS-compilant frame record), even with -fno-omit-frame-pointer.
@@ -183,8 +189,13 @@ static bool mustMaintainValidFrameChain(const llvm::opt::ArgList &Args,
183189
return V != "none";
184190
}
185191
return false;
192+
193+
case llvm::Triple::aarch64:
194+
// Arm64 Windows requires that the frame chain is valid, as there is no
195+
// way to indicate during a stack walk that a frame has used the frame
196+
// pointer as a general purpose register.
197+
return Triple.isOSWindows();
186198
}
187-
return false;
188199
}
189200

190201
// True if a target-specific option causes -fno-omit-frame-pointer to also

‎clang/test/Driver/frame-pointer-elim.c

Lines changed: 6 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -4,6 +4,8 @@
44
// KEEP-NON-LEAF: "-mframe-pointer=non-leaf"
55
// KEEP-NONE-NOT: warning: argument unused
66
// KEEP-NONE: "-mframe-pointer=none"
7+
// KEEP-RESERVED-NOT: warning: argument unused
8+
// KEEP-RESERVED: "-mframe-pointer=reserved"
79

810
// On Linux x86, omit frame pointer when optimization is enabled.
911
// RUN: %clang -### --target=i386-linux -S -fomit-frame-pointer %s 2>&1 | \
@@ -215,5 +217,9 @@
215217
// RUN: %clang -### --target=aarch64-none-elf -S -O1 -fno-omit-frame-pointer %s 2>&1 | \
216218
// RUN: FileCheck --check-prefix=KEEP-NON-LEAF %s
217219

220+
// AArch64 Windows requires that the frame pointer be reserved
221+
// RUN: %clang -### --target=aarch64-pc-windows-msvc -S -fomit-frame-pointer %s 2>&1 | \
222+
// RUN: FileCheck --check-prefix=KEEP-RESERVED %s
223+
218224
void f0() {}
219225
void f1() { f0(); }

‎llvm/lib/Target/AArch64/AArch64FrameLowering.cpp

Lines changed: 21 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -518,6 +518,27 @@ bool AArch64FrameLowering::hasFPImpl(const MachineFunction &MF) const {
518518
return false;
519519
}
520520

521+
/// Should the Frame Pointer be reserved for the current function?
522+
bool AArch64FrameLowering::isFPReserved(const MachineFunction &MF) const {
523+
const TargetMachine &TM = MF.getTarget();
524+
const Triple &TT = TM.getTargetTriple();
525+
526+
// These OSes require the frame chain is valid, even if the current frame does
527+
// not use a frame pointer.
528+
if (TT.isOSDarwin() || TT.isOSWindows())
529+
return true;
530+
531+
// If the function has a frame pointer, it is reserved.
532+
if (hasFP(MF))
533+
return true;
534+
535+
// Frontend has requested to preserve the frame pointer.
536+
if (TM.Options.FramePointerIsReserved(MF))
537+
return true;
538+
539+
return false;
540+
}
541+
521542
/// hasReservedCallFrame - Under normal circumstances, when a frame pointer is
522543
/// not required, we reserve argument space for call sites in the function
523544
/// immediately on entry to the current function. This eliminates the need for

‎llvm/lib/Target/AArch64/AArch64FrameLowering.h

Lines changed: 2 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -126,6 +126,8 @@ class AArch64FrameLowering : public TargetFrameLowering {
126126
orderFrameObjects(const MachineFunction &MF,
127127
SmallVectorImpl<int> &ObjectsToAllocate) const override;
128128

129+
bool isFPReserved(const MachineFunction &MF) const;
130+
129131
protected:
130132
bool hasFPImpl(const MachineFunction &MF) const override;
131133

‎llvm/lib/Target/AArch64/AArch64RegisterInfo.cpp

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -441,7 +441,7 @@ AArch64RegisterInfo::getStrictlyReservedRegs(const MachineFunction &MF) const {
441441
markSuperRegs(Reserved, AArch64::WSP);
442442
markSuperRegs(Reserved, AArch64::WZR);
443443

444-
if (TFI->hasFP(MF) || TT.isOSDarwin())
444+
if (TFI->isFPReserved(MF))
445445
markSuperRegs(Reserved, AArch64::W29);
446446

447447
if (MF.getSubtarget<AArch64Subtarget>().isWindowsArm64EC()) {

‎llvm/test/CodeGen/AArch64/regress-w29-reserved-with-fp.ll

Lines changed: 22 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -1,11 +1,26 @@
1-
; RUN: llc -mtriple=aarch64-none-linux-gnu -frame-pointer=all < %s | FileCheck %s
1+
; RUN: llc -mtriple=aarch64-none-linux-gnu -frame-pointer=none < %s | \
2+
; RUN: FileCheck %s --check-prefixes=CHECK,NONE
3+
; RUN: llc -mtriple=aarch64-none-linux-gnu -frame-pointer=reserved < %s | \
4+
; RUN: FileCheck %s --check-prefixes=CHECK,RESERVED
5+
; RUN: llc -mtriple=aarch64-none-linux-gnu -frame-pointer=all < %s | \
6+
; RUN: FileCheck %s --check-prefixes=CHECK,ALL
7+
8+
; By default, Darwin and Windows will reserve x29
9+
; RUN: llc -mtriple=aarch64-darwin -frame-pointer=none < %s | \
10+
; RUN: FileCheck %s --check-prefixes=CHECK,RESERVED
11+
; RUN: llc -mtriple=aarch64-darwin -frame-pointer=none < %s | \
12+
; RUN: FileCheck %s --check-prefixes=CHECK,RESERVED
213
@var = global i32 0
314

415
declare void @bar()
516

617
define void @test_w29_reserved() {
718
; CHECK-LABEL: test_w29_reserved:
8-
; CHECK: mov x29, sp
19+
; ALL: add x29, sp
20+
; NONE-NOT: add x29
21+
; NONE-NOT: mov x29
22+
; RESERVED-NOT: add x29
23+
; RESERVED-NOT: mov x29
924

1025
%val1 = load volatile i32, ptr @var
1126
%val2 = load volatile i32, ptr @var
@@ -16,8 +31,11 @@ define void @test_w29_reserved() {
1631
%val7 = load volatile i32, ptr @var
1732
%val8 = load volatile i32, ptr @var
1833
%val9 = load volatile i32, ptr @var
34+
%val10 = load volatile i32, ptr @var
1935

20-
; CHECK-NOT: ldr w29,
36+
; NONE: ldr w29,
37+
; ALL-NOT: ldr w29,
38+
; RESERVED-NOT: ldr w29,
2139

2240
; Call to prevent fp-elim that occurs regardless in leaf functions.
2341
call void @bar()
@@ -31,6 +49,7 @@ define void @test_w29_reserved() {
3149
store volatile i32 %val7, ptr @var
3250
store volatile i32 %val8, ptr @var
3351
store volatile i32 %val9, ptr @var
52+
store volatile i32 %val10, ptr @var
3453

3554
ret void
3655
; CHECK: ret

‎llvm/test/CodeGen/AArch64/win-sve.ll

Lines changed: 32 additions & 16 deletions
Original file line numberDiff line numberDiff line change
@@ -65,14 +65,18 @@ define i32 @f(<vscale x 2 x i64> %x) {
6565
; CHECK-NEXT: .seh_save_zreg z22, 16
6666
; CHECK-NEXT: str z23, [sp, #17, mul vl] // 16-byte Folded Spill
6767
; CHECK-NEXT: .seh_save_zreg z23, 17
68-
; CHECK-NEXT: stp x29, x30, [sp, #-16]! // 16-byte Folded Spill
69-
; CHECK-NEXT: .seh_save_fplr_x 16
68+
; CHECK-NEXT: str x28, [sp, #-16]! // 8-byte Folded Spill
69+
; CHECK-NEXT: .seh_save_reg_x x28, 16
70+
; CHECK-NEXT: str x30, [sp, #8] // 8-byte Folded Spill
71+
; CHECK-NEXT: .seh_save_reg x30, 8
7072
; CHECK-NEXT: .seh_endprologue
7173
; CHECK-NEXT: bl g
7274
; CHECK-NEXT: mov w0, #3 // =0x3
7375
; CHECK-NEXT: .seh_startepilogue
74-
; CHECK-NEXT: ldp x29, x30, [sp] // 16-byte Folded Reload
75-
; CHECK-NEXT: .seh_save_fplr 0
76+
; CHECK-NEXT: ldr x30, [sp, #8] // 8-byte Folded Reload
77+
; CHECK-NEXT: .seh_save_reg x30, 8
78+
; CHECK-NEXT: ldr x28, [sp] // 8-byte Folded Reload
79+
; CHECK-NEXT: .seh_save_reg x28, 0
7680
; CHECK-NEXT: add sp, sp, #16
7781
; CHECK-NEXT: .seh_stackalloc 16
7882
; CHECK-NEXT: ldr z8, [sp, #2, mul vl] // 16-byte Folded Reload
@@ -365,8 +369,10 @@ define void @f3(i64 %n, <vscale x 2 x i64> %x) {
365369
; CHECK-NEXT: .seh_save_zreg z22, 16
366370
; CHECK-NEXT: str z23, [sp, #17, mul vl] // 16-byte Folded Spill
367371
; CHECK-NEXT: .seh_save_zreg z23, 17
368-
; CHECK-NEXT: stp x29, x30, [sp, #-16]! // 16-byte Folded Spill
369-
; CHECK-NEXT: .seh_save_fplr_x 16
372+
; CHECK-NEXT: str x28, [sp, #-16]! // 8-byte Folded Spill
373+
; CHECK-NEXT: .seh_save_reg_x x28, 16
374+
; CHECK-NEXT: str x30, [sp, #8] // 8-byte Folded Spill
375+
; CHECK-NEXT: .seh_save_reg x30, 8
370376
; CHECK-NEXT: sub sp, sp, #16
371377
; CHECK-NEXT: .seh_stackalloc 16
372378
; CHECK-NEXT: .seh_endprologue
@@ -376,8 +382,10 @@ define void @f3(i64 %n, <vscale x 2 x i64> %x) {
376382
; CHECK-NEXT: .seh_startepilogue
377383
; CHECK-NEXT: add sp, sp, #16
378384
; CHECK-NEXT: .seh_stackalloc 16
379-
; CHECK-NEXT: ldp x29, x30, [sp] // 16-byte Folded Reload
380-
; CHECK-NEXT: .seh_save_fplr 0
385+
; CHECK-NEXT: ldr x30, [sp, #8] // 8-byte Folded Reload
386+
; CHECK-NEXT: .seh_save_reg x30, 8
387+
; CHECK-NEXT: ldr x28, [sp] // 8-byte Folded Reload
388+
; CHECK-NEXT: .seh_save_reg x28, 0
381389
; CHECK-NEXT: add sp, sp, #16
382390
; CHECK-NEXT: .seh_stackalloc 16
383391
; CHECK-NEXT: ldr z8, [sp, #2, mul vl] // 16-byte Folded Reload
@@ -511,8 +519,10 @@ define void @f4(i64 %n, <vscale x 2 x i64> %x) {
511519
; CHECK-NEXT: .seh_save_zreg z22, 16
512520
; CHECK-NEXT: str z23, [sp, #17, mul vl] // 16-byte Folded Spill
513521
; CHECK-NEXT: .seh_save_zreg z23, 17
514-
; CHECK-NEXT: stp x29, x30, [sp, #-16]! // 16-byte Folded Spill
515-
; CHECK-NEXT: .seh_save_fplr_x 16
522+
; CHECK-NEXT: str x28, [sp, #-16]! // 8-byte Folded Spill
523+
; CHECK-NEXT: .seh_save_reg_x x28, 16
524+
; CHECK-NEXT: str x30, [sp, #8] // 8-byte Folded Spill
525+
; CHECK-NEXT: .seh_save_reg x30, 8
516526
; CHECK-NEXT: sub sp, sp, #16
517527
; CHECK-NEXT: .seh_stackalloc 16
518528
; CHECK-NEXT: addvl sp, sp, #-1
@@ -526,8 +536,10 @@ define void @f4(i64 %n, <vscale x 2 x i64> %x) {
526536
; CHECK-NEXT: .seh_allocz 1
527537
; CHECK-NEXT: add sp, sp, #16
528538
; CHECK-NEXT: .seh_stackalloc 16
529-
; CHECK-NEXT: ldp x29, x30, [sp] // 16-byte Folded Reload
530-
; CHECK-NEXT: .seh_save_fplr 0
539+
; CHECK-NEXT: ldr x30, [sp, #8] // 8-byte Folded Reload
540+
; CHECK-NEXT: .seh_save_reg x30, 8
541+
; CHECK-NEXT: ldr x28, [sp] // 8-byte Folded Reload
542+
; CHECK-NEXT: .seh_save_reg x28, 0
531543
; CHECK-NEXT: add sp, sp, #16
532544
; CHECK-NEXT: .seh_stackalloc 16
533545
; CHECK-NEXT: ldr z8, [sp, #2, mul vl] // 16-byte Folded Reload
@@ -1093,8 +1105,10 @@ define void @f7(i64 %n) {
10931105
; CHECK-LABEL: f7:
10941106
; CHECK: .seh_proc f7
10951107
; CHECK-NEXT: // %bb.0:
1096-
; CHECK-NEXT: stp x29, x30, [sp, #-16]! // 16-byte Folded Spill
1097-
; CHECK-NEXT: .seh_save_fplr_x 16
1108+
; CHECK-NEXT: str x28, [sp, #-16]! // 8-byte Folded Spill
1109+
; CHECK-NEXT: .seh_save_reg_x x28, 16
1110+
; CHECK-NEXT: str x30, [sp, #8] // 8-byte Folded Spill
1111+
; CHECK-NEXT: .seh_save_reg x30, 8
10981112
; CHECK-NEXT: addvl sp, sp, #-1
10991113
; CHECK-NEXT: .seh_allocz 1
11001114
; CHECK-NEXT: .seh_endprologue
@@ -1103,8 +1117,10 @@ define void @f7(i64 %n) {
11031117
; CHECK-NEXT: .seh_startepilogue
11041118
; CHECK-NEXT: addvl sp, sp, #1
11051119
; CHECK-NEXT: .seh_allocz 1
1106-
; CHECK-NEXT: ldp x29, x30, [sp], #16 // 16-byte Folded Reload
1107-
; CHECK-NEXT: .seh_save_fplr_x 16
1120+
; CHECK-NEXT: ldr x30, [sp, #8] // 8-byte Folded Reload
1121+
; CHECK-NEXT: .seh_save_reg x30, 8
1122+
; CHECK-NEXT: ldr x28, [sp], #16 // 8-byte Folded Reload
1123+
; CHECK-NEXT: .seh_save_reg_x x28, 16
11081124
; CHECK-NEXT: .seh_endepilogue
11091125
; CHECK-NEXT: ret
11101126
; CHECK-NEXT: .seh_endfunclet

‎llvm/test/CodeGen/AArch64/wincfi-missing-seh-directives.ll

Lines changed: 17 additions & 19 deletions
Original file line numberDiff line numberDiff line change
@@ -5,25 +5,23 @@
55
; prologue has a corresponding seh directive.
66
;
77
; CHECK-NOT: error: Incorrect size for
8-
; CHECK: foo:
9-
; CHECK: .seh_proc foo
10-
; CHECK: sub sp, sp, #288
11-
; CHECK: .seh_stackalloc 288
12-
; CHECK: str x19, [sp] // 8-byte Folded Spill
13-
; CHECK: .seh_save_reg x19, 0
14-
; CHECK: str x21, [sp, #8] // 8-byte Folded Spill
15-
; CHECK: .seh_save_reg x21, 8
16-
; CHECK: stp x23, x24, [sp, #16] // 16-byte Folded Spill
17-
; CHECK: .seh_save_regp x23, 16
18-
; CHECK: stp x25, x26, [sp, #32] // 16-byte Folded Spill
19-
; CHECK: .seh_save_regp x25, 32
20-
; CHECK: stp x27, x28, [sp, #48] // 16-byte Folded Spill
21-
; CHECK: .seh_save_regp x27, 48
22-
; CHECK: stp x29, x30, [sp, #64] // 16-byte Folded Spill
23-
; CHECK: .seh_save_fplr 64
24-
; CHECK: sub sp, sp, #224
25-
; CHECK: .seh_stackalloc 224
26-
; CHECK: .seh_endprologue
8+
; CHECK-LABEL: foo:
9+
; CHECK-NEXT: .seh_proc foo
10+
; CHECK: sub sp, sp, #496
11+
; CHECK-NEXT: .seh_stackalloc 496
12+
; CHECK-NEXT: str x19, [sp, #208] // 8-byte Folded Spill
13+
; CHECK-NEXT: .seh_save_reg x19, 208
14+
; CHECK-NEXT: str x21, [sp, #216] // 8-byte Folded Spill
15+
; CHECK-NEXT: .seh_save_reg x21, 216
16+
; CHECK-NEXT: stp x23, x24, [sp, #224] // 16-byte Folded Spill
17+
; CHECK-NEXT: .seh_save_regp x23, 224
18+
; CHECK-NEXT: stp x25, x26, [sp, #240] // 16-byte Folded Spill
19+
; CHECK-NEXT: .seh_save_regp x25, 240
20+
; CHECK-NEXT: stp x27, x28, [sp, #256] // 16-byte Folded Spill
21+
; CHECK-NEXT: .seh_save_regp x27, 256
22+
; CHECK-NEXT: str x30, [sp, #272] // 8-byte Folded Spill
23+
; CHECK-NEXT: .seh_save_reg x30, 272
24+
; CHECK-NEXT: .seh_endprologue
2725

2826
target datalayout = "e-m:w-p:64:64-i32:32-i64:64-i128:128-n32:64-S128-Fn32"
2927
target triple = "aarch64-unknown-windows-msvc19.42.34436"

‎llvm/test/CodeGen/AArch64/wineh-frame5.mir

Lines changed: 8 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -5,8 +5,10 @@
55
# CHECK-LABEL: bb.0.entry:
66
# CHECK: early-clobber $sp = frame-setup STRXpre killed $x19, $sp, -32
77
# CHECK-NEXT: frame-setup SEH_SaveReg_X 19, -32
8-
# CHECK-NEXT: frame-setup STPXi killed $fp, killed $lr, $sp, 1
9-
# CHECK-NEXT: frame-setup SEH_SaveFPLR 8
8+
# CHECK-NEXT: frame-setup STRXui killed $x28, $sp, 1
9+
# CHECK-NEXT: frame-setup SEH_SaveReg 28, 8
10+
# CHECK-NEXT: frame-setup STRXui killed $lr, $sp, 2
11+
# CHECK-NEXT: frame-setup SEH_SaveReg 30, 16
1012
# CHECK-NEXT: $sp = frame-setup SUBXri $sp, 496, 0
1113
# CHECK-NEXT: frame-setup SEH_StackAlloc 496
1214
# CHECK-NEXT: frame-setup SEH_PrologEnd
@@ -15,8 +17,10 @@
1517
# CHECK: frame-destroy SEH_EpilogStart
1618
# CHECK-NEXT: $sp = frame-destroy ADDXri $sp, 496, 0
1719
# CHECK-NEXT: frame-destroy SEH_StackAlloc 496
18-
# CHECK-NEXT: $fp, $lr = frame-destroy LDPXi $sp, 1
19-
# CHECK-NEXT: frame-destroy SEH_SaveFPLR 8
20+
# CHECK-NEXT: $lr = frame-destroy LDRXui $sp, 2
21+
# CHECK-NEXT: frame-destroy SEH_SaveReg 30, 16
22+
# CHECK-NEXT: $x28 = frame-destroy LDRXui $sp, 1
23+
# CHECK-NEXT: frame-destroy SEH_SaveReg 28, 8
2024
# CHECK-NEXT: early-clobber $sp, $x19 = frame-destroy LDRXpost $sp, 32
2125
# CHECK-NEXT: frame-destroy SEH_SaveReg_X 19, -32
2226
# CHECK-NEXT: frame-destroy SEH_EpilogEnd

‎llvm/test/CodeGen/AArch64/wineh-frame7.mir

Lines changed: 9 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -3,13 +3,15 @@
33
# Test that stack probe results in Nop unwind codes in the prologue. Test
44
# save_fplr, save_reg_x and stack_alloc with multiple updates.
55

6-
# CHECK: early-clobber $sp = frame-setup STPXpre killed $fp, killed $lr, $sp, -2
7-
# CHECK-NEXT: frame-setup SEH_SaveFPLR_X -16
6+
# CHECK: early-clobber $sp = frame-setup STRXpre killed $x28, $sp, -32
7+
# CHECK-NEXT: frame-setup SEH_SaveReg_X 28, -32
8+
# CHECK-NEXT: frame-setup STPXi killed $fp, killed $lr, $sp, 1
9+
# CHECK-NEXT: frame-setup SEH_SaveFPLR 8
810
# CHECK-NEXT: $x15 = frame-setup MOVZXi 56009, 0
911
# CHECK-NEXT: frame-setup SEH_Nop
1012
# CHECK-NEXT: $x15 = frame-setup MOVKXi $x15, 2, 16
1113
# CHECK-NEXT: frame-setup SEH_Nop
12-
# CHECK-NEXT: frame-setup BL &__chkstk, implicit-def $lr, implicit $sp, implicit $x15
14+
# CHECK-NEXT: frame-setup BL &__chkstk, implicit-def $lr, implicit $sp, implicit $x15, implicit-def dead $x16, implicit-def dead $x17, implicit-def dead $nzcv
1315
# CHECK-NEXT: frame-setup SEH_Nop
1416
# CHECK-NEXT: $sp = frame-setup SUBXrx64 killed $sp, killed $x15, 28
1517
# CHECK-NEXT: frame-setup SEH_StackAlloc 2993296
@@ -19,8 +21,10 @@
1921
# CHECK-NEXT: frame-destroy SEH_StackAlloc 2990080
2022
# CHECK-NEXT: $sp = frame-destroy ADDXri $sp, 3216, 0
2123
# CHECK-NEXT: frame-destroy SEH_StackAlloc 3216
22-
# CHECK-NEXT: early-clobber $sp, $fp, $lr = frame-destroy LDPXpost $sp, 2
23-
# CHECK-NEXT: frame-destroy SEH_SaveFPLR_X -16
24+
# CHECK-NEXT: $fp, $lr = frame-destroy LDPXi $sp, 1
25+
# CHECK-NEXT: frame-destroy SEH_SaveFPLR 8
26+
# CHECK-NEXT: early-clobber $sp, $x28 = frame-destroy LDRXpost $sp, 32
27+
# CHECK-NEXT: frame-destroy SEH_SaveReg_X 28, -32
2428
# CHECK-NEXT: frame-destroy SEH_EpilogEnd
2529
# CHECK-NEXT: RET_ReallyLR implicit killed $w0
2630
--- |

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