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Fix alignment of unwind data.
For alignment purposes, the instruction array will always have an even number of entries, with the final entry potentially unused (in which case the array will be one longer than indicated by the count of unwind codes field). Reviewed by Charles Davis and Nico Rieck. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185760 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Kai Nacke
parent
eececbc7d3
commit
59c5c6c2b2
@ -159,11 +159,11 @@ static void EmitUnwindInfo(MCStreamer &streamer, MCWin64EHUnwindInfo *info) {
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MCContext &context = streamer.getContext();
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streamer.EmitValueToAlignment(4);
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// Upper 3 bits are the version number (currently 1).
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uint8_t flags = 0x01;
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info->Symbol = context.CreateTempSymbol();
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streamer.EmitLabel(info->Symbol);
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// Upper 3 bits are the version number (currently 1).
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uint8_t flags = 0x01;
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if (info->ChainedParent)
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flags |= Win64EH::UNW_ChainInfo << 3;
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else {
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@ -199,6 +199,14 @@ static void EmitUnwindInfo(MCStreamer &streamer, MCWin64EHUnwindInfo *info) {
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EmitUnwindCode(streamer, info->Begin, inst);
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}
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// For alignment purposes, the instruction array will always have an even
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// number of entries, with the final entry potentially unused (in which case
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// the array will be one longer than indicated by the count of unwind codes
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// field).
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if (numCodes & 1) {
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streamer.EmitIntValue(0, 2);
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}
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if (flags & (Win64EH::UNW_ChainInfo << 3))
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EmitRuntimeFunction(streamer, info->ChainedParent);
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else if (flags &
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@ -206,13 +214,10 @@ static void EmitUnwindInfo(MCStreamer &streamer, MCWin64EHUnwindInfo *info) {
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streamer.EmitValue(MCSymbolRefExpr::Create(info->ExceptionHandler,
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MCSymbolRefExpr::VK_COFF_IMGREL32,
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context), 4);
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else if (numCodes < 2) {
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else if (numCodes == 0) {
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// The minimum size of an UNWIND_INFO struct is 8 bytes. If we're not
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// a chained unwind info, if there is no handler, and if there are fewer
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// than 2 slots used in the unwind code array, we have to pad to 8 bytes.
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if (numCodes == 1)
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streamer.EmitIntValue(0, 2);
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else
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streamer.EmitIntValue(0, 4);
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}
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}
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65
test/MC/COFF/seh-align1.s
Normal file
65
test/MC/COFF/seh-align1.s
Normal file
@ -0,0 +1,65 @@
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// This test checks the alignment and padding of the unwind info.
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// RUN: llvm-mc -triple x86_64-pc-win32 -filetype=obj %s | llvm-readobj -s -sd -sr -u | FileCheck %s
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// CHECK: Sections [
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// CHECK: Section {
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// CHECK: Name: .xdata
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// CHECK: RawDataSize: 8
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// CHECK: RelocationCount: 0
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// CHECK: Characteristics [
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// CHECK-NEXT: ALIGN_4BYTES
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// CHECK-NEXT: CNT_INITIALIZED_DATA
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// CHECK-NEXT: MEM_READ
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// CHECK-NEXT: ]
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// CHECK: Relocations [
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// CHECK-NEXT: ]
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// CHECK: SectionData (
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// CHECK-NEXT: 0000: 01000000 00000000
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// CHECK-NEXT: )
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// CHECK-NEXT: }
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// CHECK: Section {
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// CHECK: Name: .pdata
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// CHECK: RawDataSize: 12
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// CHECK: RelocationCount: 3
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// CHECK: Characteristics [
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// CHECK-NEXT: IMAGE_SCN_ALIGN_4BYTES
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// CHECK-NEXT: IMAGE_SCN_CNT_INITIALIZED_DATA
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// CHECK-NEXT: IMAGE_SCN_MEM_READ
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// CHECK-NEXT: ]
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// CHECK: Relocations [
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// CHECK-NEXT: [[BeginDisp:0x[A-F0-9]+]] IMAGE_REL_AMD64_ADDR32NB smallFunc
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// CHECK-NEXT: [[EndDisp:0x[A-F0-9]+]] IMAGE_REL_AMD64_ADDR32NB smallFunc
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// CHECK-NEXT: [[UnwindDisp:0x[A-F0-9]+]] IMAGE_REL_AMD64_ADDR32NB .xdata
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// CHECK-NEXT: ]
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// CHECK: SectionData (
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// CHECK-NEXT: 0000: 00000000 01000000 00000000
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// CHECK-NEXT: )
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// CHECK-NEXT: }
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// CHECK: UnwindInformation [
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// CHECK-NEXT: RuntimeFunction {
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// CHECK-NEXT: StartAddress: smallFunc {{(\+0x[A-F0-9]+ )?}}([[BeginDisp]])
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// CHECK-NEXT: EndAddress: smallFunc {{(\+0x[A-F0-9]+ )?}}([[EndDisp]])
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// CHECK-NEXT: UnwindInfoAddress: .xdata {{(\+0x[A-F0-9]+ )?}}([[UnwindDisp]])
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// CHECK-NEXT: UnwindInfo {
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// CHECK-NEXT: Version: 1
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// CHECK-NEXT: Flags [
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// CHECK-NEXT: ]
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// CHECK-NEXT: PrologSize: 0
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// CHECK-NEXT: FrameRegister: -
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// CHECK-NEXT: FrameOffset: -
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// CHECK-NEXT: UnwindCodeCount: 0
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// CHECK-NEXT: UnwindCodes [
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// CHECK-NEXT: ]
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// CHECK-NEXT: }
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// CHECK-NEXT: }
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// CHECK-NEXT: ]
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// Generate the minimal unwind info.
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// It contains only the version set to 1. All other bytes are 0.
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.globl smallFunc
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.def smallFunc; .scl 2; .type 32; .endef
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.seh_proc smallFunc
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smallFunc:
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ret
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.seh_endproc
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78
test/MC/COFF/seh-align2.s
Normal file
78
test/MC/COFF/seh-align2.s
Normal file
@ -0,0 +1,78 @@
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// This test checks the alignment and padding of the unwind info.
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// RUN: llvm-mc -triple x86_64-pc-win32 -filetype=obj %s | llvm-readobj -s -sd -sr -u | FileCheck %s
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// CHECK: Sections [
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// CHECK: Section {
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// CHECK: Name: .xdata
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// CHECK: RawDataSize: 16
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// CHECK: RelocationCount: 1
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// CHECK: Characteristics [
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// CHECK-NEXT: ALIGN_4BYTES
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// CHECK-NEXT: CNT_INITIALIZED_DATA
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// CHECK-NEXT: MEM_READ
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// CHECK-NEXT: ]
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// CHECK: Relocations [
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// CHECK-NEXT: [[HandlerDisp:0x[A-F0-9]+]] IMAGE_REL_AMD64_ADDR32NB __C_specific_handler
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// CHECK-NEXT: ]
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// CHECK: SectionData (
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// CHECK-NEXT: 0000: 09000100 04220000 00000000 BEBAFECA
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// CHECK-NEXT: )
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// CHECK-NEXT: }
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// CHECK-NEXT: Section {
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// CHECK: Name: .pdata
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// CHECK: RawDataSize: 12
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// CHECK: RelocationCount: 3
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// CHECK: Characteristics [
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// CHECK-NEXT: IMAGE_SCN_ALIGN_4BYTES
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// CHECK-NEXT: IMAGE_SCN_CNT_INITIALIZED_DATA
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// CHECK-NEXT: IMAGE_SCN_MEM_READ
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// CHECK-NEXT: ]
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// CHECK: Relocations [
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// CHECK-NEXT: [[BeginDisp:0x[A-F0-9]+]] IMAGE_REL_AMD64_ADDR32NB func
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// CHECK-NEXT: [[EndDisp:0x[A-F0-9]+]] IMAGE_REL_AMD64_ADDR32NB func
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// CHECK-NEXT: [[UnwindDisp:0x[A-F0-9]+]] IMAGE_REL_AMD64_ADDR32NB .xdata
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// CHECK-NEXT: ]
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// CHECK: SectionData (
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// CHECK-NEXT: 0000: FCFFFFFF 05000000 00000000
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// CHECK-NEXT: )
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// CHECK-NEXT: }
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// CHECK-NEXT: ]
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// CHECK: UnwindInformation [
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// CHECK-NEXT: RuntimeFunction {
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// CHECK-NEXT: StartAddress: func {{(\+0x[A-F0-9]+ )?}}([[BeginDisp]])
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// CHECK-NEXT: EndAddress: func {{(\+0x[A-F0-9]+ )?}}([[EndDisp]])
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// CHECK-NEXT: UnwindInfoAddress: .xdata {{(\+0x[A-F0-9]+ )?}}([[UnwindDisp]])
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// CHECK-NEXT: UnwindInfo {
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// CHECK-NEXT: Version: 1
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// CHECK-NEXT: Flags [
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// CHECK-NEXT: ExceptionHandler
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// CHECK-NEXT: ]
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// CHECK-NEXT: PrologSize: 0
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// CHECK-NEXT: FrameRegister: -
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// CHECK-NEXT: FrameOffset: -
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// CHECK-NEXT: UnwindCodeCount: 1
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// CHECK-NEXT: UnwindCodes [
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// CHECK-NEXT: 0x04: ALLOC_SMALL size=24
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// CHECK-NEXT: ]
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// CHECK-NEXT: Handler: __C_specific_handler ([[HandlerDisp]])
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// CHECK-NEXT: }
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// CHECK-NEXT: }
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// CHECK-NEXT: ]
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// Generates only one unwind code.
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// Requires padding of the unwind code array.
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.globl func
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.def func; .scl 2; .type 32; .endef
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.seh_proc func
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subq $24, %rsp
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.seh_stackalloc 24
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.seh_handler __C_specific_handler, @except
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.seh_handlerdata
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.long 0xcafebabe
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.text
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.seh_endprologue
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func:
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addq $24, %rsp
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ret
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.seh_endproc
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83
test/MC/COFF/seh-align3.s
Normal file
83
test/MC/COFF/seh-align3.s
Normal file
@ -0,0 +1,83 @@
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// This test checks the alignment and padding of the unwind info.
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// RUN: llvm-mc -triple x86_64-pc-win32 -filetype=obj %s | llvm-readobj -s -sd -sr -u | FileCheck %s
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// CHECK: Sections [
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// CHECK: Section {
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// CHECK: Name: .xdata
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// CHECK: RawDataSize: 16
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// CHECK: RelocationCount: 1
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// CHECK: Characteristics [
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// CHECK-NEXT: ALIGN_4BYTES
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// CHECK-NEXT: CNT_INITIALIZED_DATA
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// CHECK-NEXT: MEM_READ
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// CHECK-NEXT: ]
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// CHECK: Relocations [
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// CHECK-NEXT: [[HandlerDisp:0x[A-F0-9]+]] IMAGE_REL_AMD64_ADDR32NB __C_specific_handler
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// CHECK-NEXT: ]
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// CHECK: SectionData (
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// CHECK-NEXT: 0000: 19000200 04D002C0 00000000 BEBAFECA
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// CHECK-NEXT: )
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// CHECK-NEXT: }
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// CHECK-NEXT: Section {
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// CHECK: Name: .pdata
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// CHECK: RawDataSize: 12
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// CHECK: RelocationCount: 3
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// CHECK: Characteristics [
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// CHECK-NEXT: IMAGE_SCN_ALIGN_4BYTES
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// CHECK-NEXT: IMAGE_SCN_CNT_INITIALIZED_DATA
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// CHECK-NEXT: IMAGE_SCN_MEM_READ
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// CHECK-NEXT: ]
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// CHECK: Relocations [
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// CHECK-NEXT: [[BeginDisp:0x[A-F0-9]+]] IMAGE_REL_AMD64_ADDR32NB func
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// CHECK-NEXT: [[EndDisp:0x[A-F0-9]+]] IMAGE_REL_AMD64_ADDR32NB func
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// CHECK-NEXT: [[UnwindDisp:0x[A-F0-9]+]] IMAGE_REL_AMD64_ADDR32NB .xdata
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// CHECK-NEXT: ]
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// CHECK: SectionData (
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// CHECK-NEXT: 0000: FCFFFFFF 05000000 00000000
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// CHECK-NEXT: )
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// CHECK-NEXT: }
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// CHECK-NEXT: ]
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// CHECK: UnwindInformation [
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// CHECK-NEXT: RuntimeFunction {
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// CHECK-NEXT: StartAddress: func {{(\+0x[A-F0-9]+ )?}}([[BeginDisp]])
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// CHECK-NEXT: EndAddress: func {{(\+0x[A-F0-9]+ )?}}([[EndDisp]])
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// CHECK-NEXT: UnwindInfoAddress: .xdata {{(\+0x[A-F0-9]+ )?}}([[UnwindDisp]])
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// CHECK-NEXT: UnwindInfo {
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// CHECK-NEXT: Version: 1
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// CHECK-NEXT: Flags [
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// CHECK-NEXT: ExceptionHandler
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// CHECK-NEXT: TerminateHandler
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// CHECK-NEXT: ]
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// CHECK-NEXT: PrologSize: 0
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// CHECK-NEXT: FrameRegister: -
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// CHECK-NEXT: FrameOffset: -
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// CHECK-NEXT: UnwindCodeCount: 2
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// CHECK-NEXT: UnwindCodes [
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// CHECK-NEXT: 0x04: PUSH_NONVOL reg=R13
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// CHECK-NEXT: 0x02: PUSH_NONVOL reg=R12
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// CHECK-NEXT: ]
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// CHECK-NEXT: Handler: __C_specific_handler ([[HandlerDisp]])
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// CHECK-NEXT: }
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// CHECK-NEXT: }
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// CHECK-NEXT: ]
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// Generates two unwind codes.
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// Requires no padding of the unwind code array.
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.globl func
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.def func; .scl 2; .type 32; .endef
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.seh_proc func
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push %r12
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.seh_pushreg 12
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push %r13
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.seh_pushreg 13
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.seh_handler __C_specific_handler, @except, @unwind
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.seh_handlerdata
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.long 0xcafebabe
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.text
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.seh_endprologue
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func:
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pop %r13
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pop %r12
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ret
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.seh_endproc
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