From 59c5c6c2b24b77371e53e6dbdf035edb50eafe1a Mon Sep 17 00:00:00 2001 From: Kai Nacke Date: Sat, 6 Jul 2013 17:16:50 +0000 Subject: [PATCH] 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 --- lib/MC/MCWin64EH.cpp | 19 +++++---- test/MC/COFF/seh-align1.s | 65 ++++++++++++++++++++++++++++++ test/MC/COFF/seh-align2.s | 78 ++++++++++++++++++++++++++++++++++++ test/MC/COFF/seh-align3.s | 83 +++++++++++++++++++++++++++++++++++++++ 4 files changed, 238 insertions(+), 7 deletions(-) create mode 100644 test/MC/COFF/seh-align1.s create mode 100644 test/MC/COFF/seh-align2.s create mode 100644 test/MC/COFF/seh-align3.s diff --git a/lib/MC/MCWin64EH.cpp b/lib/MC/MCWin64EH.cpp index c3d568b454c..b8b07d3a180 100644 --- a/lib/MC/MCWin64EH.cpp +++ b/lib/MC/MCWin64EH.cpp @@ -159,11 +159,11 @@ static void EmitUnwindInfo(MCStreamer &streamer, MCWin64EHUnwindInfo *info) { MCContext &context = streamer.getContext(); streamer.EmitValueToAlignment(4); - // Upper 3 bits are the version number (currently 1). - uint8_t flags = 0x01; info->Symbol = context.CreateTempSymbol(); streamer.EmitLabel(info->Symbol); + // Upper 3 bits are the version number (currently 1). + uint8_t flags = 0x01; if (info->ChainedParent) flags |= Win64EH::UNW_ChainInfo << 3; else { @@ -199,6 +199,14 @@ static void EmitUnwindInfo(MCStreamer &streamer, MCWin64EHUnwindInfo *info) { EmitUnwindCode(streamer, info->Begin, inst); } + // 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). + if (numCodes & 1) { + streamer.EmitIntValue(0, 2); + } + if (flags & (Win64EH::UNW_ChainInfo << 3)) EmitRuntimeFunction(streamer, info->ChainedParent); else if (flags & @@ -206,14 +214,11 @@ static void EmitUnwindInfo(MCStreamer &streamer, MCWin64EHUnwindInfo *info) { streamer.EmitValue(MCSymbolRefExpr::Create(info->ExceptionHandler, MCSymbolRefExpr::VK_COFF_IMGREL32, context), 4); - else if (numCodes < 2) { + else if (numCodes == 0) { // The minimum size of an UNWIND_INFO struct is 8 bytes. If we're not // a chained unwind info, if there is no handler, and if there are fewer // than 2 slots used in the unwind code array, we have to pad to 8 bytes. - if (numCodes == 1) - streamer.EmitIntValue(0, 2); - else - streamer.EmitIntValue(0, 4); + streamer.EmitIntValue(0, 4); } } diff --git a/test/MC/COFF/seh-align1.s b/test/MC/COFF/seh-align1.s new file mode 100644 index 00000000000..aafc6ede085 --- /dev/null +++ b/test/MC/COFF/seh-align1.s @@ -0,0 +1,65 @@ +// This test checks the alignment and padding of the unwind info. + +// RUN: llvm-mc -triple x86_64-pc-win32 -filetype=obj %s | llvm-readobj -s -sd -sr -u | FileCheck %s + +// CHECK: Sections [ +// CHECK: Section { +// CHECK: Name: .xdata +// CHECK: RawDataSize: 8 +// CHECK: RelocationCount: 0 +// CHECK: Characteristics [ +// CHECK-NEXT: ALIGN_4BYTES +// CHECK-NEXT: CNT_INITIALIZED_DATA +// CHECK-NEXT: MEM_READ +// CHECK-NEXT: ] +// CHECK: Relocations [ +// CHECK-NEXT: ] +// CHECK: SectionData ( +// CHECK-NEXT: 0000: 01000000 00000000 +// CHECK-NEXT: ) +// CHECK-NEXT: } +// CHECK: Section { +// CHECK: Name: .pdata +// CHECK: RawDataSize: 12 +// CHECK: RelocationCount: 3 +// CHECK: Characteristics [ +// CHECK-NEXT: IMAGE_SCN_ALIGN_4BYTES +// CHECK-NEXT: IMAGE_SCN_CNT_INITIALIZED_DATA +// CHECK-NEXT: IMAGE_SCN_MEM_READ +// CHECK-NEXT: ] +// CHECK: Relocations [ +// CHECK-NEXT: [[BeginDisp:0x[A-F0-9]+]] IMAGE_REL_AMD64_ADDR32NB smallFunc +// CHECK-NEXT: [[EndDisp:0x[A-F0-9]+]] IMAGE_REL_AMD64_ADDR32NB smallFunc +// CHECK-NEXT: [[UnwindDisp:0x[A-F0-9]+]] IMAGE_REL_AMD64_ADDR32NB .xdata +// CHECK-NEXT: ] +// CHECK: SectionData ( +// CHECK-NEXT: 0000: 00000000 01000000 00000000 +// CHECK-NEXT: ) +// CHECK-NEXT: } +// CHECK: UnwindInformation [ +// CHECK-NEXT: RuntimeFunction { +// CHECK-NEXT: StartAddress: smallFunc {{(\+0x[A-F0-9]+ )?}}([[BeginDisp]]) +// CHECK-NEXT: EndAddress: smallFunc {{(\+0x[A-F0-9]+ )?}}([[EndDisp]]) +// CHECK-NEXT: UnwindInfoAddress: .xdata {{(\+0x[A-F0-9]+ )?}}([[UnwindDisp]]) +// CHECK-NEXT: UnwindInfo { +// CHECK-NEXT: Version: 1 +// CHECK-NEXT: Flags [ +// CHECK-NEXT: ] +// CHECK-NEXT: PrologSize: 0 +// CHECK-NEXT: FrameRegister: - +// CHECK-NEXT: FrameOffset: - +// CHECK-NEXT: UnwindCodeCount: 0 +// CHECK-NEXT: UnwindCodes [ +// CHECK-NEXT: ] +// CHECK-NEXT: } +// CHECK-NEXT: } +// CHECK-NEXT: ] + +// Generate the minimal unwind info. +// It contains only the version set to 1. All other bytes are 0. + .globl smallFunc + .def smallFunc; .scl 2; .type 32; .endef + .seh_proc smallFunc +smallFunc: + ret + .seh_endproc diff --git a/test/MC/COFF/seh-align2.s b/test/MC/COFF/seh-align2.s new file mode 100644 index 00000000000..5e6c49a720c --- /dev/null +++ b/test/MC/COFF/seh-align2.s @@ -0,0 +1,78 @@ +// This test checks the alignment and padding of the unwind info. + +// RUN: llvm-mc -triple x86_64-pc-win32 -filetype=obj %s | llvm-readobj -s -sd -sr -u | FileCheck %s + +// CHECK: Sections [ +// CHECK: Section { +// CHECK: Name: .xdata +// CHECK: RawDataSize: 16 +// CHECK: RelocationCount: 1 +// CHECK: Characteristics [ +// CHECK-NEXT: ALIGN_4BYTES +// CHECK-NEXT: CNT_INITIALIZED_DATA +// CHECK-NEXT: MEM_READ +// CHECK-NEXT: ] +// CHECK: Relocations [ +// CHECK-NEXT: [[HandlerDisp:0x[A-F0-9]+]] IMAGE_REL_AMD64_ADDR32NB __C_specific_handler +// CHECK-NEXT: ] +// CHECK: SectionData ( +// CHECK-NEXT: 0000: 09000100 04220000 00000000 BEBAFECA +// CHECK-NEXT: ) +// CHECK-NEXT: } +// CHECK-NEXT: Section { +// CHECK: Name: .pdata +// CHECK: RawDataSize: 12 +// CHECK: RelocationCount: 3 +// CHECK: Characteristics [ +// CHECK-NEXT: IMAGE_SCN_ALIGN_4BYTES +// CHECK-NEXT: IMAGE_SCN_CNT_INITIALIZED_DATA +// CHECK-NEXT: IMAGE_SCN_MEM_READ +// CHECK-NEXT: ] +// CHECK: Relocations [ +// CHECK-NEXT: [[BeginDisp:0x[A-F0-9]+]] IMAGE_REL_AMD64_ADDR32NB func +// CHECK-NEXT: [[EndDisp:0x[A-F0-9]+]] IMAGE_REL_AMD64_ADDR32NB func +// CHECK-NEXT: [[UnwindDisp:0x[A-F0-9]+]] IMAGE_REL_AMD64_ADDR32NB .xdata +// CHECK-NEXT: ] +// CHECK: SectionData ( +// CHECK-NEXT: 0000: FCFFFFFF 05000000 00000000 +// CHECK-NEXT: ) +// CHECK-NEXT: } +// CHECK-NEXT: ] +// CHECK: UnwindInformation [ +// CHECK-NEXT: RuntimeFunction { +// CHECK-NEXT: StartAddress: func {{(\+0x[A-F0-9]+ )?}}([[BeginDisp]]) +// CHECK-NEXT: EndAddress: func {{(\+0x[A-F0-9]+ )?}}([[EndDisp]]) +// CHECK-NEXT: UnwindInfoAddress: .xdata {{(\+0x[A-F0-9]+ )?}}([[UnwindDisp]]) +// CHECK-NEXT: UnwindInfo { +// CHECK-NEXT: Version: 1 +// CHECK-NEXT: Flags [ +// CHECK-NEXT: ExceptionHandler +// CHECK-NEXT: ] +// CHECK-NEXT: PrologSize: 0 +// CHECK-NEXT: FrameRegister: - +// CHECK-NEXT: FrameOffset: - +// CHECK-NEXT: UnwindCodeCount: 1 +// CHECK-NEXT: UnwindCodes [ +// CHECK-NEXT: 0x04: ALLOC_SMALL size=24 +// CHECK-NEXT: ] +// CHECK-NEXT: Handler: __C_specific_handler ([[HandlerDisp]]) +// CHECK-NEXT: } +// CHECK-NEXT: } +// CHECK-NEXT: ] + +// Generates only one unwind code. +// Requires padding of the unwind code array. + .globl func + .def func; .scl 2; .type 32; .endef + .seh_proc func + subq $24, %rsp + .seh_stackalloc 24 + .seh_handler __C_specific_handler, @except + .seh_handlerdata + .long 0xcafebabe + .text + .seh_endprologue +func: + addq $24, %rsp + ret + .seh_endproc diff --git a/test/MC/COFF/seh-align3.s b/test/MC/COFF/seh-align3.s new file mode 100644 index 00000000000..238b5de3564 --- /dev/null +++ b/test/MC/COFF/seh-align3.s @@ -0,0 +1,83 @@ +// This test checks the alignment and padding of the unwind info. + +// RUN: llvm-mc -triple x86_64-pc-win32 -filetype=obj %s | llvm-readobj -s -sd -sr -u | FileCheck %s + +// CHECK: Sections [ +// CHECK: Section { +// CHECK: Name: .xdata +// CHECK: RawDataSize: 16 +// CHECK: RelocationCount: 1 +// CHECK: Characteristics [ +// CHECK-NEXT: ALIGN_4BYTES +// CHECK-NEXT: CNT_INITIALIZED_DATA +// CHECK-NEXT: MEM_READ +// CHECK-NEXT: ] +// CHECK: Relocations [ +// CHECK-NEXT: [[HandlerDisp:0x[A-F0-9]+]] IMAGE_REL_AMD64_ADDR32NB __C_specific_handler +// CHECK-NEXT: ] +// CHECK: SectionData ( +// CHECK-NEXT: 0000: 19000200 04D002C0 00000000 BEBAFECA +// CHECK-NEXT: ) +// CHECK-NEXT: } +// CHECK-NEXT: Section { +// CHECK: Name: .pdata +// CHECK: RawDataSize: 12 +// CHECK: RelocationCount: 3 +// CHECK: Characteristics [ +// CHECK-NEXT: IMAGE_SCN_ALIGN_4BYTES +// CHECK-NEXT: IMAGE_SCN_CNT_INITIALIZED_DATA +// CHECK-NEXT: IMAGE_SCN_MEM_READ +// CHECK-NEXT: ] +// CHECK: Relocations [ +// CHECK-NEXT: [[BeginDisp:0x[A-F0-9]+]] IMAGE_REL_AMD64_ADDR32NB func +// CHECK-NEXT: [[EndDisp:0x[A-F0-9]+]] IMAGE_REL_AMD64_ADDR32NB func +// CHECK-NEXT: [[UnwindDisp:0x[A-F0-9]+]] IMAGE_REL_AMD64_ADDR32NB .xdata +// CHECK-NEXT: ] +// CHECK: SectionData ( +// CHECK-NEXT: 0000: FCFFFFFF 05000000 00000000 +// CHECK-NEXT: ) +// CHECK-NEXT: } +// CHECK-NEXT: ] +// CHECK: UnwindInformation [ +// CHECK-NEXT: RuntimeFunction { +// CHECK-NEXT: StartAddress: func {{(\+0x[A-F0-9]+ )?}}([[BeginDisp]]) +// CHECK-NEXT: EndAddress: func {{(\+0x[A-F0-9]+ )?}}([[EndDisp]]) +// CHECK-NEXT: UnwindInfoAddress: .xdata {{(\+0x[A-F0-9]+ )?}}([[UnwindDisp]]) +// CHECK-NEXT: UnwindInfo { +// CHECK-NEXT: Version: 1 +// CHECK-NEXT: Flags [ +// CHECK-NEXT: ExceptionHandler +// CHECK-NEXT: TerminateHandler +// CHECK-NEXT: ] +// CHECK-NEXT: PrologSize: 0 +// CHECK-NEXT: FrameRegister: - +// CHECK-NEXT: FrameOffset: - +// CHECK-NEXT: UnwindCodeCount: 2 +// CHECK-NEXT: UnwindCodes [ +// CHECK-NEXT: 0x04: PUSH_NONVOL reg=R13 +// CHECK-NEXT: 0x02: PUSH_NONVOL reg=R12 +// CHECK-NEXT: ] +// CHECK-NEXT: Handler: __C_specific_handler ([[HandlerDisp]]) +// CHECK-NEXT: } +// CHECK-NEXT: } +// CHECK-NEXT: ] + +// Generates two unwind codes. +// Requires no padding of the unwind code array. + .globl func + .def func; .scl 2; .type 32; .endef + .seh_proc func + push %r12 + .seh_pushreg 12 + push %r13 + .seh_pushreg 13 + .seh_handler __C_specific_handler, @except, @unwind + .seh_handlerdata + .long 0xcafebabe + .text + .seh_endprologue +func: + pop %r13 + pop %r12 + ret + .seh_endproc