mirror of
https://github.com/ZDoom/qzdoom.git
synced 2024-11-24 21:11:39 +00:00
- hook up unix unwind info (still not working)
This commit is contained in:
Magnus Norddahl
parent
b1bb82fe01
commit
6e598274f7
1 changed files with 133 additions and 74 deletions
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@ -289,35 +289,32 @@ extern "C"
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void __deregister_frame(const void*);
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}
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static void WriteLength(TArray<uint8_t> &stream, unsigned int pos, unsigned int v)
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static void WriteLength64(TArray<uint8_t> &stream, unsigned int pos, unsigned int v)
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{
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*(uint64_t*)(&stream[pos]) = v;
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}
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static void WriteLength(TArray<uint8_t> &stream, unsigned int pos, unsigned int v)
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{
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*(uint32_t*)(&stream[pos]) = v;
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}
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static void WriteUInt64(TArray<uint8_t> &stream, uint64_t v)
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{
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stream.Push(v & 0xff);
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stream.Push((v >> 8) & 0xff);
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stream.Push((v >> 16) & 0xff);
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stream.Push((v >> 24) & 0xff);
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stream.Push((v >> 32) & 0xff);
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stream.Push((v >> 40) & 0xff);
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stream.Push((v >> 48) & 0xff);
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stream.Push(v >> 56);
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for (int i = 0; i < 8; i++)
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stream.Push((v >> (i * 8)) & 0xff);
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}
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static void WriteUInt32(TArray<uint8_t> &stream, uint32_t v)
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{
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stream.Push(v & 0xff);
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stream.Push((v >> 8) & 0xff);
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stream.Push((v >> 16) & 0xff);
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stream.Push(v >> 24);
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for (int i = 0; i < 4; i++)
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stream.Push((v >> (i * 8)) & 0xff);
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}
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static void WriteUInt16(TArray<uint8_t> &stream, uint16_t v)
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{
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stream.Push(v & 0xff);
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stream.Push((v >> 8) & 0xff);
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for (int i = 0; i < 2; i++)
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stream.Push((v >> (i * 8)) & 0xff);
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}
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static void WriteUInt8(TArray<uint8_t> &stream, uint8_t v)
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@ -366,22 +363,18 @@ static void WriteSLEB128(TArray<uint8_t> &stream, int32_t v)
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}
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}
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static void WriteCIE(TArray<uint8_t> &stream, const TArray<uint8_t> &cieInstructions, uint8_t returnAddressReg, int minInstAlignment, int dataAlignmentFactor)
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static void WritePadding(TArray<uint8_t> &stream)
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{
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WriteUInt32(stream, 0xffffffff); // this is a 64-bit entry
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unsigned int lengthPos = stream.Size();
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WriteUInt64(stream, 0); // Length
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int padding = stream.Size() % 8;
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if (padding != 0)
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{
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padding = 8 - padding;
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for (int i = 0; i <= padding; i++) WriteUInt8(stream, 0);
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}
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}
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WriteUInt32(stream, 0); // CIE ID
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WriteUInt8(stream, 1); // CIE Version
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WriteUInt8(stream, 'z');
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//WriteUInt8(stream, 'R'); // fde encoding
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WriteUInt8(stream, 0);
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WriteULEB128(stream, minInstAlignment);
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WriteSLEB128(stream, dataAlignmentFactor);
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WriteUInt8(stream, returnAddressReg);
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// augmentation length and data (empty but aligned)
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static void WriteEmptyAugmentation(TArray<uint8_t> &stream)
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{
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int padding = (stream.Size() + 1) % 8;
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if (padding == 0)
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{
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@ -393,38 +386,72 @@ static void WriteCIE(TArray<uint8_t> &stream, const TArray<uint8_t> &cieInstruct
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WriteULEB128(stream, padding);
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for (int i = 0; i <= padding; i++) WriteUInt8(stream, 0);
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}
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}
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static void WriteCIE(TArray<uint8_t> &stream, const TArray<uint8_t> &cieInstructions, uint8_t returnAddressReg)
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{
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#ifdef USE_DWARF64
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WriteUInt32(stream, 0xffffffff); // this is a 64-bit entry
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unsigned int lengthPos = stream.Size();
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WriteUInt64(stream, 0); // Length
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WriteUInt64(stream, 0); // CIE ID
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#else
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unsigned int lengthPos = stream.Size();
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WriteUInt32(stream, 0); // Length
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WriteUInt32(stream, 0); // CIE ID
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#endif
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WriteUInt8(stream, 1); // CIE Version
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WriteUInt8(stream, 'z');
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//WriteUInt8(stream, 'R'); // fde encoding
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WriteUInt8(stream, 0);
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WriteULEB128(stream, 1);
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WriteSLEB128(stream, -4);
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WriteUInt8(stream, returnAddressReg);
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WriteEmptyAugmentation(stream);
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for (unsigned int i = 0; i < cieInstructions.Size(); i++)
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stream.Push(cieInstructions[i]);
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// Padding and update length field
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unsigned int length = stream.Size() - lengthPos - 8;
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padding = stream.Size() % 8;
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for (int i = 0; i <= padding; i++) WriteUInt8(stream, 0);
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WriteLength(stream, lengthPos, length);
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WritePadding(stream);
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#ifdef USE_DWARF64
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WriteLength64(stream, lengthPos, stream.Size() - lengthPos - 8);
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#else
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WriteLength(stream, lengthPos, stream.Size() - lengthPos - 4);
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#endif
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}
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static void WriteFDE(TArray<uint8_t> &stream, const TArray<uint8_t> &fdeInstructions, uint32_t cieLocation, unsigned int &functionStart)
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{
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uint32_t offsetToCIE = stream.Size() - cieLocation;
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#ifdef USE_DWARF64
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WriteUInt32(stream, 0xffffffff); // this is a 64-bit entry
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unsigned int lengthPos = stream.Size();
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WriteUInt64(stream, 0); // Length
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uint32_t offsetToCIE = stream.Size() - cieLocation;
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WriteUInt64(stream, offsetToCIE);
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#else
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unsigned int lengthPos = stream.Size();
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WriteUInt32(stream, 0); // Length
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uint32_t offsetToCIE = stream.Size() - cieLocation;
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WriteUInt32(stream, offsetToCIE);
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#endif
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functionStart = stream.Size();
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WriteUInt64(stream, 0); // func start
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WriteUInt64(stream, 0); // func size
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WriteEmptyAugmentation(stream);
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for (unsigned int i = 0; i < fdeInstructions.Size(); i++)
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stream.Push(fdeInstructions[i]);
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// Padding and update length field
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unsigned int length = stream.Size() - lengthPos - 8;
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int padding = stream.Size() % 8;
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for (int i = 0; i <= padding; i++) WriteUInt8(stream, 0);
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WriteLength(stream, lengthPos, length);
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WritePadding(stream);
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#ifdef USE_DWARF64
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WriteLength64(stream, lengthPos, stream.Size() - lengthPos - 8);
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#else
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WriteLength(stream, lengthPos, stream.Size() - lengthPos - 4);
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#endif
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}
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static void WriteAdvanceLoc(TArray<uint8_t> &fdeInstructions, uint64_t offset, uint64_t &lastOffset)
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@ -452,17 +479,6 @@ static TArray<uint8_t> CreateUnwindInfoUnix(asmjit::CCFunc *func, unsigned int &
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{
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using namespace asmjit;
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FuncFrameLayout layout;
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Error error = layout.init(func->getDetail(), func->getFrameInfo());
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if (error != kErrorOk)
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I_FatalError("FuncFrameLayout.init failed");
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// We need a dummy emitter for instruction size calculations
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CodeHolder code;
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code.init(GetHostCodeInfo());
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X86Assembler assembler(&code);
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X86Emitter *emitter = assembler.asEmitter();
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// Build .eh_frame:
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//
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// The documentation for this can be found in the DWARF standard
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@ -495,12 +511,35 @@ static TArray<uint8_t> CreateUnwindInfoUnix(asmjit::CCFunc *func, unsigned int &
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TArray<uint8_t> fdeInstructions;
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uint64_t lastOffset = 0;
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int minInstAlignment = 1;
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int dataAlignmentFactor = -4;
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uint8_t returnAddressReg = dwarfRegRAId;
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// To do: do we need to write register defaults into the CIE or does the defaults match the x64 calling convention?
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// Do we need to write register defaults into the CIE or does the defaults match the x64 calling convention?
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// Great! the "System V Application Binary Interface AMD64 Architecture Processor Supplement" doesn't say what the defaults are..
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// This is basically just the x64 calling convention..
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WriteUInt8(cieInstructions, 0x0c); // DW_CFA_def_cfa
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WriteULEB128(cieInstructions, dwarfRegId[X86Gp::kIdSp]);
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WriteULEB128(cieInstructions, 0);
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for (auto regId : { X86Gp::kIdAx, X86Gp::kIdDx, X86Gp::kIdCx, X86Gp::kIdSi, X86Gp::kIdDi, X86Gp::kIdSp, X86Gp::kIdR8, X86Gp::kIdR9, X86Gp::kIdR10, X86Gp::kIdR11 })
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{
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WriteUInt8(cieInstructions, 0x07); // DW_CFA_undefined
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WriteULEB128(cieInstructions, dwarfRegId[regId]);
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}
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for (auto regId : { X86Gp::kIdBx, X86Gp::kIdBp, X86Gp::kIdR12, X86Gp::kIdR13, X86Gp::kIdR14, X86Gp::kIdR15 })
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{
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WriteUInt8(cieInstructions, 0x08); // DW_CFA_same_value
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WriteULEB128(cieInstructions, dwarfRegId[regId]);
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}
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FuncFrameLayout layout;
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Error error = layout.init(func->getDetail(), func->getFrameInfo());
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if (error != kErrorOk)
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I_FatalError("FuncFrameLayout.init failed");
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// We need a dummy emitter for instruction size calculations
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CodeHolder code;
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code.init(GetHostCodeInfo());
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X86Assembler assembler(&code);
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X86Emitter *emitter = assembler.asEmitter();
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// Note: the following code must match exactly what X86Internal::emitProlog does
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@ -511,7 +550,7 @@ static TArray<uint8_t> CreateUnwindInfoUnix(asmjit::CCFunc *func, unsigned int &
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X86Gp saReg = emitter->zsp(); // Stack-arguments base register.
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uint32_t gpSaved = layout.getSavedRegs(X86Reg::kKindGp);
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int saveoffset = 0;
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int stackOffset = 0;
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if (layout.hasPreservedFP())
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{
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@ -521,9 +560,11 @@ static TArray<uint8_t> CreateUnwindInfoUnix(asmjit::CCFunc *func, unsigned int &
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emitter->push(zbp);
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WriteAdvanceLoc(fdeInstructions, assembler.getOffset(), lastOffset);
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stackOffset += 8;
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WriteUInt8(fdeInstructions, 0x0e); // DW_CFA_def_cfa_offset
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WriteULEB128(fdeInstructions, stackOffset);
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WriteUInt8(fdeInstructions, (2 << 6) | dwarfRegId[X86Gp::kIdBp]); // DW_CFA_offset
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WriteULEB128(fdeInstructions, saveoffset);
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saveoffset += 2;
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WriteULEB128(fdeInstructions, stackOffset - 8);
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emitter->mov(zbp, zsp);
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}
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@ -538,9 +579,11 @@ static TArray<uint8_t> CreateUnwindInfoUnix(asmjit::CCFunc *func, unsigned int &
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emitter->push(gpReg);
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WriteAdvanceLoc(fdeInstructions, assembler.getOffset(), lastOffset);
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stackOffset += 8;
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WriteUInt8(fdeInstructions, 0x0e); // DW_CFA_def_cfa_offset
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WriteULEB128(fdeInstructions, stackOffset);
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WriteUInt8(fdeInstructions, (2 << 6) | dwarfRegId[regId]); // DW_CFA_offset
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WriteULEB128(fdeInstructions, saveoffset);
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saveoffset += 2;
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WriteULEB128(fdeInstructions, stackOffset - 8);
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}
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}
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@ -566,12 +609,10 @@ static TArray<uint8_t> CreateUnwindInfoUnix(asmjit::CCFunc *func, unsigned int &
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// Emit: 'sub zsp, StackAdjustment'.
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emitter->sub(zsp, layout.getStackAdjustment());
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uint32_t stackadjust = layout.getStackAdjustment();
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WriteAdvanceLoc(fdeInstructions, assembler.getOffset(), lastOffset);
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stackOffset += layout.getStackAdjustment();
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WriteUInt8(fdeInstructions, 0x0e); // DW_CFA_def_cfa_offset
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WriteULEB128(fdeInstructions, stackadjust);
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saveoffset += layout.getStackAdjustment() / dataAlignmentFactor;
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WriteULEB128(fdeInstructions, stackOffset);
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}
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if (layout.hasDynamicAlignment() && layout.hasDsaSlotUsed())
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@ -584,7 +625,7 @@ static TArray<uint8_t> CreateUnwindInfoUnix(asmjit::CCFunc *func, unsigned int &
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uint32_t xmmSaved = layout.getSavedRegs(X86Reg::kKindVec);
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if (xmmSaved)
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{
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saveoffset += layout.getVecStackOffset() / dataAlignmentFactor;
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stackOffset += layout.getVecStackOffset();
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X86Mem vecBase = x86::ptr(zsp, layout.getVecStackOffset());
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X86Reg vecReg = x86::xmm(0);
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bool avx = layout.isAvxEnabled();
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@ -602,13 +643,13 @@ static TArray<uint8_t> CreateUnwindInfoUnix(asmjit::CCFunc *func, unsigned int &
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WriteAdvanceLoc(fdeInstructions, assembler.getOffset(), lastOffset);
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WriteUInt8(fdeInstructions, (2 << 6) | (dwarfRegXmmId + regId)); // DW_CFA_offset
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WriteULEB128(fdeInstructions, saveoffset);
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saveoffset += 2;
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WriteULEB128(fdeInstructions, stackOffset);
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stackOffset += 8;
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}
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}
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TArray<uint8_t> stream;
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WriteCIE(stream, cieInstructions, returnAddressReg, minInstAlignment, dataAlignmentFactor);
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WriteCIE(stream, cieInstructions, returnAddressReg);
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WriteFDE(stream, fdeInstructions, 0, functionStart);
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WriteUInt32(stream, 0);
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return stream;
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@ -623,7 +664,7 @@ void *AddJitFunction(asmjit::CodeHolder* code, asmjit::CCFunc *func)
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return nullptr;
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unsigned int fdeFunctionStart = 0;
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TArray<uint8_t> unwindInfo;// = CreateUnwindInfoUnix(func, fdeFunctionStart);
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TArray<uint8_t> unwindInfo = CreateUnwindInfoUnix(func, fdeFunctionStart);
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size_t unwindInfoSize = unwindInfo.Size();
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codeSize = (codeSize + 15) / 16 * 16;
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@ -661,11 +702,29 @@ void *AddJitFunction(asmjit::CodeHolder* code, asmjit::CCFunc *func)
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if (length == 0)
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break;
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uint32_t offset = *((uint32_t *)(entry + 4));
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if (offset != 0)
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if (length == 0xffffffff)
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{
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__register_frame(entry);
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JitFrames.Push(entry);
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uint64_t length64 = *((uint64_t *)(entry + 4));
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if (length64 == 0)
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break;
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uint64_t offset = *((uint64_t *)(entry + 12));
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if (offset != 0)
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{
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__register_frame(entry);
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JitFrames.Push(entry);
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}
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entry += length64 + 12;
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}
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else
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{
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uint32_t offset = *((uint32_t *)(entry + 4));
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if (offset != 0)
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{
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__register_frame(entry);
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JitFrames.Push(entry);
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}
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entry += length + 4;
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}
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}
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#else
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