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llvm-project/libunwind/src/UnwindCursor.hpp
Martin Storsjo a2646444d2 Fix existing code for SEH on ARM to compile correctly 
Even though SEH for ARM is incomplete, make what code already exists
at least compile correctly.

The _LIBUNWIND_CURSOR_SIZE wasn't correct.

ARM (and AArch64) have a DISPATCHER_CONTEXT field named TargetPc
instead of TargetIp.

For the libunwind.h UNW_* constants, there is no UNW_ARM_PC, only
UNW_ARM_IP.

Don't use 'r' as loop variable when 'r' already is a Registers_arm
member.

Differential Revision: https://reviews.llvm.org/D51530

llvm-svn: 341217
2018-08-31 14:56:55 +00:00

2015 lines
68 KiB
C++
Raw Blame History

//===------------------------- UnwindCursor.hpp ---------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//
// C++ interface to lower levels of libunwind
//===----------------------------------------------------------------------===//
#ifndef __UNWINDCURSOR_HPP__
#define __UNWINDCURSOR_HPP__
#include <algorithm>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <unwind.h>
#ifdef _WIN32
#include <windows.h>
#include <ntverp.h>
#endif
#ifdef __APPLE__
#include <mach-o/dyld.h>
#endif
#if defined(_LIBUNWIND_SUPPORT_SEH_UNWIND)
// Provide a definition for the DISPATCHER_CONTEXT struct for old (Win7 and
// earlier) SDKs.
// MinGW-w64 has always provided this struct.
#if defined(_WIN32) && defined(_LIBUNWIND_TARGET_X86_64) && \
!defined(__MINGW32__) && VER_PRODUCTBUILD < 8000
struct _DISPATCHER_CONTEXT {
ULONG64 ControlPc;
ULONG64 ImageBase;
PRUNTIME_FUNCTION FunctionEntry;
ULONG64 EstablisherFrame;
ULONG64 TargetIp;
PCONTEXT ContextRecord;
PEXCEPTION_ROUTINE LanguageHandler;
PVOID HandlerData;
PUNWIND_HISTORY_TABLE HistoryTable;
ULONG ScopeIndex;
ULONG Fill0;
};
#endif
struct UNWIND_INFO {
uint8_t Version : 3;
uint8_t Flags : 5;
uint8_t SizeOfProlog;
uint8_t CountOfCodes;
uint8_t FrameRegister : 4;
uint8_t FrameOffset : 4;
uint16_t UnwindCodes[2];
};
extern "C" _Unwind_Reason_Code __libunwind_seh_personality(
int, _Unwind_Action, uint64_t, _Unwind_Exception *,
struct _Unwind_Context *);
#endif
#include "config.h"
#include "AddressSpace.hpp"
#include "CompactUnwinder.hpp"
#include "config.h"
#include "DwarfInstructions.hpp"
#include "EHHeaderParser.hpp"
#include "libunwind.h"
#include "Registers.hpp"
#include "RWMutex.hpp"
#include "Unwind-EHABI.h"
namespace libunwind {
#if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
/// Cache of recently found FDEs.
template <typename A>
class _LIBUNWIND_HIDDEN DwarfFDECache {
typedef typename A::pint_t pint_t;
public:
static pint_t findFDE(pint_t mh, pint_t pc);
static void add(pint_t mh, pint_t ip_start, pint_t ip_end, pint_t fde);
static void removeAllIn(pint_t mh);
static void iterateCacheEntries(void (*func)(unw_word_t ip_start,
unw_word_t ip_end,
unw_word_t fde, unw_word_t mh));
private:
struct entry {
pint_t mh;
pint_t ip_start;
pint_t ip_end;
pint_t fde;
};
// These fields are all static to avoid needing an initializer.
// There is only one instance of this class per process.
static RWMutex _lock;
#ifdef __APPLE__
static void dyldUnloadHook(const struct mach_header *mh, intptr_t slide);
static bool _registeredForDyldUnloads;
#endif
// Can't use std::vector<> here because this code is below libc++.
static entry *_buffer;
static entry *_bufferUsed;
static entry *_bufferEnd;
static entry _initialBuffer[64];
};
template <typename A>
typename DwarfFDECache<A>::entry *
DwarfFDECache<A>::_buffer = _initialBuffer;
template <typename A>
typename DwarfFDECache<A>::entry *
DwarfFDECache<A>::_bufferUsed = _initialBuffer;
template <typename A>
typename DwarfFDECache<A>::entry *
DwarfFDECache<A>::_bufferEnd = &_initialBuffer[64];
template <typename A>
typename DwarfFDECache<A>::entry DwarfFDECache<A>::_initialBuffer[64];
template <typename A>
RWMutex DwarfFDECache<A>::_lock;
#ifdef __APPLE__
template <typename A>
bool DwarfFDECache<A>::_registeredForDyldUnloads = false;
#endif
template <typename A>
typename A::pint_t DwarfFDECache<A>::findFDE(pint_t mh, pint_t pc) {
pint_t result = 0;
_LIBUNWIND_LOG_IF_FALSE(_lock.lock_shared());
for (entry *p = _buffer; p < _bufferUsed; ++p) {
if ((mh == p->mh) || (mh == 0)) {
if ((p->ip_start <= pc) && (pc < p->ip_end)) {
result = p->fde;
break;
}
}
}
_LIBUNWIND_LOG_IF_FALSE(_lock.unlock_shared());
return result;
}
template <typename A>
void DwarfFDECache<A>::add(pint_t mh, pint_t ip_start, pint_t ip_end,
pint_t fde) {
#if !defined(_LIBUNWIND_NO_HEAP)
_LIBUNWIND_LOG_IF_FALSE(_lock.lock());
if (_bufferUsed >= _bufferEnd) {
size_t oldSize = (size_t)(_bufferEnd - _buffer);
size_t newSize = oldSize * 4;
// Can't use operator new (we are below it).
entry *newBuffer = (entry *)malloc(newSize * sizeof(entry));
memcpy(newBuffer, _buffer, oldSize * sizeof(entry));
if (_buffer != _initialBuffer)
free(_buffer);
_buffer = newBuffer;
_bufferUsed = &newBuffer[oldSize];
_bufferEnd = &newBuffer[newSize];
}
_bufferUsed->mh = mh;
_bufferUsed->ip_start = ip_start;
_bufferUsed->ip_end = ip_end;
_bufferUsed->fde = fde;
++_bufferUsed;
#ifdef __APPLE__
if (!_registeredForDyldUnloads) {
_dyld_register_func_for_remove_image(&dyldUnloadHook);
_registeredForDyldUnloads = true;
}
#endif
_LIBUNWIND_LOG_IF_FALSE(_lock.unlock());
#endif
}
template <typename A>
void DwarfFDECache<A>::removeAllIn(pint_t mh) {
_LIBUNWIND_LOG_IF_FALSE(_lock.lock());
entry *d = _buffer;
for (const entry *s = _buffer; s < _bufferUsed; ++s) {
if (s->mh != mh) {
if (d != s)
*d = *s;
++d;
}
}
_bufferUsed = d;
_LIBUNWIND_LOG_IF_FALSE(_lock.unlock());
}
#ifdef __APPLE__
template <typename A>
void DwarfFDECache<A>::dyldUnloadHook(const struct mach_header *mh, intptr_t ) {
removeAllIn((pint_t) mh);
}
#endif
template <typename A>
void DwarfFDECache<A>::iterateCacheEntries(void (*func)(
unw_word_t ip_start, unw_word_t ip_end, unw_word_t fde, unw_word_t mh)) {
_LIBUNWIND_LOG_IF_FALSE(_lock.lock());
for (entry *p = _buffer; p < _bufferUsed; ++p) {
(*func)(p->ip_start, p->ip_end, p->fde, p->mh);
}
_LIBUNWIND_LOG_IF_FALSE(_lock.unlock());
}
#endif // defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
#define arrayoffsetof(type, index, field) ((size_t)(&((type *)0)[index].field))
#if defined(_LIBUNWIND_SUPPORT_COMPACT_UNWIND)
template <typename A> class UnwindSectionHeader {
public:
UnwindSectionHeader(A &addressSpace, typename A::pint_t addr)
: _addressSpace(addressSpace), _addr(addr) {}
uint32_t version() const {
return _addressSpace.get32(_addr +
offsetof(unwind_info_section_header, version));
}
uint32_t commonEncodingsArraySectionOffset() const {
return _addressSpace.get32(_addr +
offsetof(unwind_info_section_header,
commonEncodingsArraySectionOffset));
}
uint32_t commonEncodingsArrayCount() const {
return _addressSpace.get32(_addr + offsetof(unwind_info_section_header,
commonEncodingsArrayCount));
}
uint32_t personalityArraySectionOffset() const {
return _addressSpace.get32(_addr + offsetof(unwind_info_section_header,
personalityArraySectionOffset));
}
uint32_t personalityArrayCount() const {
return _addressSpace.get32(
_addr + offsetof(unwind_info_section_header, personalityArrayCount));
}
uint32_t indexSectionOffset() const {
return _addressSpace.get32(
_addr + offsetof(unwind_info_section_header, indexSectionOffset));
}
uint32_t indexCount() const {
return _addressSpace.get32(
_addr + offsetof(unwind_info_section_header, indexCount));
}
private:
A &_addressSpace;
typename A::pint_t _addr;
};
template <typename A> class UnwindSectionIndexArray {
public:
UnwindSectionIndexArray(A &addressSpace, typename A::pint_t addr)
: _addressSpace(addressSpace), _addr(addr) {}
uint32_t functionOffset(uint32_t index) const {
return _addressSpace.get32(
_addr + arrayoffsetof(unwind_info_section_header_index_entry, index,
functionOffset));
}
uint32_t secondLevelPagesSectionOffset(uint32_t index) const {
return _addressSpace.get32(
_addr + arrayoffsetof(unwind_info_section_header_index_entry, index,
secondLevelPagesSectionOffset));
}
uint32_t lsdaIndexArraySectionOffset(uint32_t index) const {
return _addressSpace.get32(
_addr + arrayoffsetof(unwind_info_section_header_index_entry, index,
lsdaIndexArraySectionOffset));
}
private:
A &_addressSpace;
typename A::pint_t _addr;
};
template <typename A> class UnwindSectionRegularPageHeader {
public:
UnwindSectionRegularPageHeader(A &addressSpace, typename A::pint_t addr)
: _addressSpace(addressSpace), _addr(addr) {}
uint32_t kind() const {
return _addressSpace.get32(
_addr + offsetof(unwind_info_regular_second_level_page_header, kind));
}
uint16_t entryPageOffset() const {
return _addressSpace.get16(
_addr + offsetof(unwind_info_regular_second_level_page_header,
entryPageOffset));
}
uint16_t entryCount() const {
return _addressSpace.get16(
_addr +
offsetof(unwind_info_regular_second_level_page_header, entryCount));
}
private:
A &_addressSpace;
typename A::pint_t _addr;
};
template <typename A> class UnwindSectionRegularArray {
public:
UnwindSectionRegularArray(A &addressSpace, typename A::pint_t addr)
: _addressSpace(addressSpace), _addr(addr) {}
uint32_t functionOffset(uint32_t index) const {
return _addressSpace.get32(
_addr + arrayoffsetof(unwind_info_regular_second_level_entry, index,
functionOffset));
}
uint32_t encoding(uint32_t index) const {
return _addressSpace.get32(
_addr +
arrayoffsetof(unwind_info_regular_second_level_entry, index, encoding));
}
private:
A &_addressSpace;
typename A::pint_t _addr;
};
template <typename A> class UnwindSectionCompressedPageHeader {
public:
UnwindSectionCompressedPageHeader(A &addressSpace, typename A::pint_t addr)
: _addressSpace(addressSpace), _addr(addr) {}
uint32_t kind() const {
return _addressSpace.get32(
_addr +
offsetof(unwind_info_compressed_second_level_page_header, kind));
}
uint16_t entryPageOffset() const {
return _addressSpace.get16(
_addr + offsetof(unwind_info_compressed_second_level_page_header,
entryPageOffset));
}
uint16_t entryCount() const {
return _addressSpace.get16(
_addr +
offsetof(unwind_info_compressed_second_level_page_header, entryCount));
}
uint16_t encodingsPageOffset() const {
return _addressSpace.get16(
_addr + offsetof(unwind_info_compressed_second_level_page_header,
encodingsPageOffset));
}
uint16_t encodingsCount() const {
return _addressSpace.get16(
_addr + offsetof(unwind_info_compressed_second_level_page_header,
encodingsCount));
}
private:
A &_addressSpace;
typename A::pint_t _addr;
};
template <typename A> class UnwindSectionCompressedArray {
public:
UnwindSectionCompressedArray(A &addressSpace, typename A::pint_t addr)
: _addressSpace(addressSpace), _addr(addr) {}
uint32_t functionOffset(uint32_t index) const {
return UNWIND_INFO_COMPRESSED_ENTRY_FUNC_OFFSET(
_addressSpace.get32(_addr + index * sizeof(uint32_t)));
}
uint16_t encodingIndex(uint32_t index) const {
return UNWIND_INFO_COMPRESSED_ENTRY_ENCODING_INDEX(
_addressSpace.get32(_addr + index * sizeof(uint32_t)));
}
private:
A &_addressSpace;
typename A::pint_t _addr;
};
template <typename A> class UnwindSectionLsdaArray {
public:
UnwindSectionLsdaArray(A &addressSpace, typename A::pint_t addr)
: _addressSpace(addressSpace), _addr(addr) {}
uint32_t functionOffset(uint32_t index) const {
return _addressSpace.get32(
_addr + arrayoffsetof(unwind_info_section_header_lsda_index_entry,
index, functionOffset));
}
uint32_t lsdaOffset(uint32_t index) const {
return _addressSpace.get32(
_addr + arrayoffsetof(unwind_info_section_header_lsda_index_entry,
index, lsdaOffset));
}
private:
A &_addressSpace;
typename A::pint_t _addr;
};
#endif // defined(_LIBUNWIND_SUPPORT_COMPACT_UNWIND)
class _LIBUNWIND_HIDDEN AbstractUnwindCursor {
public:
// NOTE: provide a class specific placement deallocation function (S5.3.4 p20)
// This avoids an unnecessary dependency to libc++abi.
void operator delete(void *, size_t) {}
virtual ~AbstractUnwindCursor() {}
virtual bool validReg(int) { _LIBUNWIND_ABORT("validReg not implemented"); }
virtual unw_word_t getReg(int) { _LIBUNWIND_ABORT("getReg not implemented"); }
virtual void setReg(int, unw_word_t) {
_LIBUNWIND_ABORT("setReg not implemented");
}
virtual bool validFloatReg(int) {
_LIBUNWIND_ABORT("validFloatReg not implemented");
}
virtual unw_fpreg_t getFloatReg(int) {
_LIBUNWIND_ABORT("getFloatReg not implemented");
}
virtual void setFloatReg(int, unw_fpreg_t) {
_LIBUNWIND_ABORT("setFloatReg not implemented");
}
virtual int step() { _LIBUNWIND_ABORT("step not implemented"); }
virtual void getInfo(unw_proc_info_t *) {
_LIBUNWIND_ABORT("getInfo not implemented");
}
virtual void jumpto() { _LIBUNWIND_ABORT("jumpto not implemented"); }
virtual bool isSignalFrame() {
_LIBUNWIND_ABORT("isSignalFrame not implemented");
}
virtual bool getFunctionName(char *, size_t, unw_word_t *) {
_LIBUNWIND_ABORT("getFunctionName not implemented");
}
virtual void setInfoBasedOnIPRegister(bool = false) {
_LIBUNWIND_ABORT("setInfoBasedOnIPRegister not implemented");
}
virtual const char *getRegisterName(int) {
_LIBUNWIND_ABORT("getRegisterName not implemented");
}
#ifdef __arm__
virtual void saveVFPAsX() { _LIBUNWIND_ABORT("saveVFPAsX not implemented"); }
#endif
};
#if defined(_LIBUNWIND_SUPPORT_SEH_UNWIND) && defined(_WIN32)
/// \c UnwindCursor contains all state (including all register values) during
/// an unwind. This is normally stack-allocated inside a unw_cursor_t.
template <typename A, typename R>
class UnwindCursor : public AbstractUnwindCursor {
typedef typename A::pint_t pint_t;
public:
UnwindCursor(unw_context_t *context, A &as);
UnwindCursor(CONTEXT *context, A &as);
UnwindCursor(A &as, void *threadArg);
virtual ~UnwindCursor() {}
virtual bool validReg(int);
virtual unw_word_t getReg(int);
virtual void setReg(int, unw_word_t);
virtual bool validFloatReg(int);
virtual unw_fpreg_t getFloatReg(int);
virtual void setFloatReg(int, unw_fpreg_t);
virtual int step();
virtual void getInfo(unw_proc_info_t *);
virtual void jumpto();
virtual bool isSignalFrame();
virtual bool getFunctionName(char *buf, size_t len, unw_word_t *off);
virtual void setInfoBasedOnIPRegister(bool isReturnAddress = false);
virtual const char *getRegisterName(int num);
#ifdef __arm__
virtual void saveVFPAsX();
#endif
DISPATCHER_CONTEXT *getDispatcherContext() { return &_dispContext; }
void setDispatcherContext(DISPATCHER_CONTEXT *disp) { _dispContext = *disp; }
private:
pint_t getLastPC() const { return _dispContext.ControlPc; }
void setLastPC(pint_t pc) { _dispContext.ControlPc = pc; }
RUNTIME_FUNCTION *lookUpSEHUnwindInfo(pint_t pc, pint_t *base) {
_dispContext.FunctionEntry = RtlLookupFunctionEntry(pc,
&_dispContext.ImageBase,
_dispContext.HistoryTable);
*base = _dispContext.ImageBase;
return _dispContext.FunctionEntry;
}
bool getInfoFromSEH(pint_t pc);
int stepWithSEHData() {
_dispContext.LanguageHandler = RtlVirtualUnwind(UNW_FLAG_UHANDLER,
_dispContext.ImageBase,
_dispContext.ControlPc,
_dispContext.FunctionEntry,
_dispContext.ContextRecord,
&_dispContext.HandlerData,
&_dispContext.EstablisherFrame,
NULL);
// Update some fields of the unwind info now, since we have them.
_info.lsda = reinterpret_cast<unw_word_t>(_dispContext.HandlerData);
if (_dispContext.LanguageHandler) {
_info.handler = reinterpret_cast<unw_word_t>(__libunwind_seh_personality);
} else
_info.handler = 0;
return UNW_STEP_SUCCESS;
}
A &_addressSpace;
unw_proc_info_t _info;
DISPATCHER_CONTEXT _dispContext;
CONTEXT _msContext;
UNWIND_HISTORY_TABLE _histTable;
bool _unwindInfoMissing;
};
template <typename A, typename R>
UnwindCursor<A, R>::UnwindCursor(unw_context_t *context, A &as)
: _addressSpace(as), _unwindInfoMissing(false) {
static_assert((check_fit<UnwindCursor<A, R>, unw_cursor_t>::does_fit),
"UnwindCursor<> does not fit in unw_cursor_t");
memset(&_info, 0, sizeof(_info));
memset(&_histTable, 0, sizeof(_histTable));
_dispContext.ContextRecord = &_msContext;
_dispContext.HistoryTable = &_histTable;
// Initialize MS context from ours.
R r(context);
_msContext.ContextFlags = CONTEXT_CONTROL|CONTEXT_INTEGER|CONTEXT_FLOATING_POINT;
#if defined(_LIBUNWIND_TARGET_X86_64)
_msContext.Rax = r.getRegister(UNW_X86_64_RAX);
_msContext.Rcx = r.getRegister(UNW_X86_64_RCX);
_msContext.Rdx = r.getRegister(UNW_X86_64_RDX);
_msContext.Rbx = r.getRegister(UNW_X86_64_RBX);
_msContext.Rsp = r.getRegister(UNW_X86_64_RSP);
_msContext.Rbp = r.getRegister(UNW_X86_64_RBP);
_msContext.Rsi = r.getRegister(UNW_X86_64_RSI);
_msContext.Rdi = r.getRegister(UNW_X86_64_RDI);
_msContext.R8 = r.getRegister(UNW_X86_64_R8);
_msContext.R9 = r.getRegister(UNW_X86_64_R9);
_msContext.R10 = r.getRegister(UNW_X86_64_R10);
_msContext.R11 = r.getRegister(UNW_X86_64_R11);
_msContext.R12 = r.getRegister(UNW_X86_64_R12);
_msContext.R13 = r.getRegister(UNW_X86_64_R13);
_msContext.R14 = r.getRegister(UNW_X86_64_R14);
_msContext.R15 = r.getRegister(UNW_X86_64_R15);
_msContext.Rip = r.getRegister(UNW_REG_IP);
union {
v128 v;
M128A m;
} t;
t.v = r.getVectorRegister(UNW_X86_64_XMM0);
_msContext.Xmm0 = t.m;
t.v = r.getVectorRegister(UNW_X86_64_XMM1);
_msContext.Xmm1 = t.m;
t.v = r.getVectorRegister(UNW_X86_64_XMM2);
_msContext.Xmm2 = t.m;
t.v = r.getVectorRegister(UNW_X86_64_XMM3);
_msContext.Xmm3 = t.m;
t.v = r.getVectorRegister(UNW_X86_64_XMM4);
_msContext.Xmm4 = t.m;
t.v = r.getVectorRegister(UNW_X86_64_XMM5);
_msContext.Xmm5 = t.m;
t.v = r.getVectorRegister(UNW_X86_64_XMM6);
_msContext.Xmm6 = t.m;
t.v = r.getVectorRegister(UNW_X86_64_XMM7);
_msContext.Xmm7 = t.m;
t.v = r.getVectorRegister(UNW_X86_64_XMM8);
_msContext.Xmm8 = t.m;
t.v = r.getVectorRegister(UNW_X86_64_XMM9);
_msContext.Xmm9 = t.m;
t.v = r.getVectorRegister(UNW_X86_64_XMM10);
_msContext.Xmm10 = t.m;
t.v = r.getVectorRegister(UNW_X86_64_XMM11);
_msContext.Xmm11 = t.m;
t.v = r.getVectorRegister(UNW_X86_64_XMM12);
_msContext.Xmm12 = t.m;
t.v = r.getVectorRegister(UNW_X86_64_XMM13);
_msContext.Xmm13 = t.m;
t.v = r.getVectorRegister(UNW_X86_64_XMM14);
_msContext.Xmm14 = t.m;
t.v = r.getVectorRegister(UNW_X86_64_XMM15);
_msContext.Xmm15 = t.m;
#elif defined(_LIBUNWIND_TARGET_ARM)
_msContext.R0 = r.getRegister(UNW_ARM_R0);
_msContext.R1 = r.getRegister(UNW_ARM_R1);
_msContext.R2 = r.getRegister(UNW_ARM_R2);
_msContext.R3 = r.getRegister(UNW_ARM_R3);
_msContext.R4 = r.getRegister(UNW_ARM_R4);
_msContext.R5 = r.getRegister(UNW_ARM_R5);
_msContext.R6 = r.getRegister(UNW_ARM_R6);
_msContext.R7 = r.getRegister(UNW_ARM_R7);
_msContext.R8 = r.getRegister(UNW_ARM_R8);
_msContext.R9 = r.getRegister(UNW_ARM_R9);
_msContext.R10 = r.getRegister(UNW_ARM_R10);
_msContext.R11 = r.getRegister(UNW_ARM_R11);
_msContext.R12 = r.getRegister(UNW_ARM_R12);
_msContext.Sp = r.getRegister(UNW_ARM_SP);
_msContext.Lr = r.getRegister(UNW_ARM_LR);
_msContext.Pc = r.getRegister(UNW_ARM_IP);
for (int i = UNW_ARM_D0; i <= UNW_ARM_D31; ++i) {
union {
uint64_t w;
double d;
} d;
d.d = r.getFloatRegister(i);
_msContext.D[i - UNW_ARM_D0] = d.w;
}
#endif
}
template <typename A, typename R>
UnwindCursor<A, R>::UnwindCursor(CONTEXT *context, A &as)
: _addressSpace(as), _unwindInfoMissing(false) {
static_assert((check_fit<UnwindCursor<A, R>, unw_cursor_t>::does_fit),
"UnwindCursor<> does not fit in unw_cursor_t");
memset(&_info, 0, sizeof(_info));
memset(&_histTable, 0, sizeof(_histTable));
_dispContext.ContextRecord = &_msContext;
_dispContext.HistoryTable = &_histTable;
_msContext = *context;
}
template <typename A, typename R>
bool UnwindCursor<A, R>::validReg(int regNum) {
if (regNum == UNW_REG_IP || regNum == UNW_REG_SP) return true;
#if defined(_LIBUNWIND_TARGET_X86_64)
if (regNum >= UNW_X86_64_RAX && regNum <= UNW_X86_64_R15) return true;
#elif defined(_LIBUNWIND_TARGET_ARM)
if (regNum >= UNW_ARM_R0 && regNum <= UNW_ARM_R15) return true;
#endif
return false;
}
template <typename A, typename R>
unw_word_t UnwindCursor<A, R>::getReg(int regNum) {
switch (regNum) {
#if defined(_LIBUNWIND_TARGET_X86_64)
case UNW_REG_IP: return _msContext.Rip;
case UNW_X86_64_RAX: return _msContext.Rax;
case UNW_X86_64_RDX: return _msContext.Rdx;
case UNW_X86_64_RCX: return _msContext.Rcx;
case UNW_X86_64_RBX: return _msContext.Rbx;
case UNW_REG_SP:
case UNW_X86_64_RSP: return _msContext.Rsp;
case UNW_X86_64_RBP: return _msContext.Rbp;
case UNW_X86_64_RSI: return _msContext.Rsi;
case UNW_X86_64_RDI: return _msContext.Rdi;
case UNW_X86_64_R8: return _msContext.R8;
case UNW_X86_64_R9: return _msContext.R9;
case UNW_X86_64_R10: return _msContext.R10;
case UNW_X86_64_R11: return _msContext.R11;
case UNW_X86_64_R12: return _msContext.R12;
case UNW_X86_64_R13: return _msContext.R13;
case UNW_X86_64_R14: return _msContext.R14;
case UNW_X86_64_R15: return _msContext.R15;
#elif defined(_LIBUNWIND_TARGET_ARM)
case UNW_ARM_R0: return _msContext.R0;
case UNW_ARM_R1: return _msContext.R1;
case UNW_ARM_R2: return _msContext.R2;
case UNW_ARM_R3: return _msContext.R3;
case UNW_ARM_R4: return _msContext.R4;
case UNW_ARM_R5: return _msContext.R5;
case UNW_ARM_R6: return _msContext.R6;
case UNW_ARM_R7: return _msContext.R7;
case UNW_ARM_R8: return _msContext.R8;
case UNW_ARM_R9: return _msContext.R9;
case UNW_ARM_R10: return _msContext.R10;
case UNW_ARM_R11: return _msContext.R11;
case UNW_ARM_R12: return _msContext.R12;
case UNW_REG_SP:
case UNW_ARM_SP: return _msContext.Sp;
case UNW_ARM_LR: return _msContext.Lr;
case UNW_REG_IP:
case UNW_ARM_IP: return _msContext.Pc;
#endif
}
_LIBUNWIND_ABORT("unsupported register");
}
template <typename A, typename R>
void UnwindCursor<A, R>::setReg(int regNum, unw_word_t value) {
switch (regNum) {
#if defined(_LIBUNWIND_TARGET_X86_64)
case UNW_REG_IP: _msContext.Rip = value; break;
case UNW_X86_64_RAX: _msContext.Rax = value; break;
case UNW_X86_64_RDX: _msContext.Rdx = value; break;
case UNW_X86_64_RCX: _msContext.Rcx = value; break;
case UNW_X86_64_RBX: _msContext.Rbx = value; break;
case UNW_REG_SP:
case UNW_X86_64_RSP: _msContext.Rsp = value; break;
case UNW_X86_64_RBP: _msContext.Rbp = value; break;
case UNW_X86_64_RSI: _msContext.Rsi = value; break;
case UNW_X86_64_RDI: _msContext.Rdi = value; break;
case UNW_X86_64_R8: _msContext.R8 = value; break;
case UNW_X86_64_R9: _msContext.R9 = value; break;
case UNW_X86_64_R10: _msContext.R10 = value; break;
case UNW_X86_64_R11: _msContext.R11 = value; break;
case UNW_X86_64_R12: _msContext.R12 = value; break;
case UNW_X86_64_R13: _msContext.R13 = value; break;
case UNW_X86_64_R14: _msContext.R14 = value; break;
case UNW_X86_64_R15: _msContext.R15 = value; break;
#elif defined(_LIBUNWIND_TARGET_ARM)
case UNW_ARM_R0: _msContext.R0 = value; break;
case UNW_ARM_R1: _msContext.R1 = value; break;
case UNW_ARM_R2: _msContext.R2 = value; break;
case UNW_ARM_R3: _msContext.R3 = value; break;
case UNW_ARM_R4: _msContext.R4 = value; break;
case UNW_ARM_R5: _msContext.R5 = value; break;
case UNW_ARM_R6: _msContext.R6 = value; break;
case UNW_ARM_R7: _msContext.R7 = value; break;
case UNW_ARM_R8: _msContext.R8 = value; break;
case UNW_ARM_R9: _msContext.R9 = value; break;
case UNW_ARM_R10: _msContext.R10 = value; break;
case UNW_ARM_R11: _msContext.R11 = value; break;
case UNW_ARM_R12: _msContext.R12 = value; break;
case UNW_REG_SP:
case UNW_ARM_SP: _msContext.Sp = value; break;
case UNW_ARM_LR: _msContext.Lr = value; break;
case UNW_REG_IP:
case UNW_ARM_IP: _msContext.Pc = value; break;
#endif
default:
_LIBUNWIND_ABORT("unsupported register");
}
}
template <typename A, typename R>
bool UnwindCursor<A, R>::validFloatReg(int regNum) {
#if defined(_LIBUNWIND_TARGET_ARM)
if (regNum >= UNW_ARM_S0 && regNum <= UNW_ARM_S31) return true;
if (regNum >= UNW_ARM_D0 && regNum <= UNW_ARM_D31) return true;
#endif
return false;
}
template <typename A, typename R>
unw_fpreg_t UnwindCursor<A, R>::getFloatReg(int regNum) {
#if defined(_LIBUNWIND_TARGET_ARM)
if (regNum >= UNW_ARM_S0 && regNum <= UNW_ARM_S31) {
union {
uint32_t w;
float f;
} d;
d.w = _msContext.S[regNum - UNW_ARM_S0];
return d.f;
}
if (regNum >= UNW_ARM_D0 && regNum <= UNW_ARM_D31) {
union {
uint64_t w;
double d;
} d;
d.w = _msContext.D[regNum - UNW_ARM_D0];
return d.d;
}
_LIBUNWIND_ABORT("unsupported float register");
#else
_LIBUNWIND_ABORT("float registers unimplemented");
#endif
}
template <typename A, typename R>
void UnwindCursor<A, R>::setFloatReg(int regNum, unw_fpreg_t value) {
#if defined(_LIBUNWIND_TARGET_ARM)
if (regNum >= UNW_ARM_S0 && regNum <= UNW_ARM_S31) {
union {
uint32_t w;
float f;
} d;
d.f = value;
_msContext.S[regNum - UNW_ARM_S0] = d.w;
}
if (regNum >= UNW_ARM_D0 && regNum <= UNW_ARM_D31) {
union {
uint64_t w;
double d;
} d;
d.d = value;
_msContext.D[regNum - UNW_ARM_D0] = d.w;
}
_LIBUNWIND_ABORT("unsupported float register");
#else
_LIBUNWIND_ABORT("float registers unimplemented");
#endif
}
template <typename A, typename R> void UnwindCursor<A, R>::jumpto() {
RtlRestoreContext(&_msContext, nullptr);
}
#ifdef __arm__
template <typename A, typename R> void UnwindCursor<A, R>::saveVFPAsX() {}
#endif
template <typename A, typename R>
const char *UnwindCursor<A, R>::getRegisterName(int regNum) {
switch (regNum) {
#if defined(_LIBUNWIND_TARGET_X86_64)
case UNW_REG_IP: return "rip";
case UNW_X86_64_RAX: return "rax";
case UNW_X86_64_RDX: return "rdx";
case UNW_X86_64_RCX: return "rcx";
case UNW_X86_64_RBX: return "rbx";
case UNW_REG_SP:
case UNW_X86_64_RSP: return "rsp";
case UNW_X86_64_RBP: return "rbp";
case UNW_X86_64_RSI: return "rsi";
case UNW_X86_64_RDI: return "rdi";
case UNW_X86_64_R8: return "r8";
case UNW_X86_64_R9: return "r9";
case UNW_X86_64_R10: return "r10";
case UNW_X86_64_R11: return "r11";
case UNW_X86_64_R12: return "r12";
case UNW_X86_64_R13: return "r13";
case UNW_X86_64_R14: return "r14";
case UNW_X86_64_R15: return "r15";
#elif defined(_LIBUNWIND_TARGET_ARM)
case UNW_ARM_R0: return "r0";
case UNW_ARM_R1: return "r1";
case UNW_ARM_R2: return "r2";
case UNW_ARM_R3: return "r3";
case UNW_ARM_R4: return "r4";
case UNW_ARM_R5: return "r5";
case UNW_ARM_R6: return "r6";
case UNW_ARM_R7: return "r7";
case UNW_ARM_R8: return "r8";
case UNW_ARM_R9: return "r9";
case UNW_ARM_R10: return "r10";
case UNW_ARM_R11: return "r11";
case UNW_ARM_R12: return "r12";
case UNW_REG_SP:
case UNW_ARM_SP: return "sp";
case UNW_ARM_LR: return "lr";
case UNW_REG_IP:
case UNW_ARM_IP: return "pc";
case UNW_ARM_S0: return "s0";
case UNW_ARM_S1: return "s1";
case UNW_ARM_S2: return "s2";
case UNW_ARM_S3: return "s3";
case UNW_ARM_S4: return "s4";
case UNW_ARM_S5: return "s5";
case UNW_ARM_S6: return "s6";
case UNW_ARM_S7: return "s7";
case UNW_ARM_S8: return "s8";
case UNW_ARM_S9: return "s9";
case UNW_ARM_S10: return "s10";
case UNW_ARM_S11: return "s11";
case UNW_ARM_S12: return "s12";
case UNW_ARM_S13: return "s13";
case UNW_ARM_S14: return "s14";
case UNW_ARM_S15: return "s15";
case UNW_ARM_S16: return "s16";
case UNW_ARM_S17: return "s17";
case UNW_ARM_S18: return "s18";
case UNW_ARM_S19: return "s19";
case UNW_ARM_S20: return "s20";
case UNW_ARM_S21: return "s21";
case UNW_ARM_S22: return "s22";
case UNW_ARM_S23: return "s23";
case UNW_ARM_S24: return "s24";
case UNW_ARM_S25: return "s25";
case UNW_ARM_S26: return "s26";
case UNW_ARM_S27: return "s27";
case UNW_ARM_S28: return "s28";
case UNW_ARM_S29: return "s29";
case UNW_ARM_S30: return "s30";
case UNW_ARM_S31: return "s31";
case UNW_ARM_D0: return "d0";
case UNW_ARM_D1: return "d1";
case UNW_ARM_D2: return "d2";
case UNW_ARM_D3: return "d3";
case UNW_ARM_D4: return "d4";
case UNW_ARM_D5: return "d5";
case UNW_ARM_D6: return "d6";
case UNW_ARM_D7: return "d7";
case UNW_ARM_D8: return "d8";
case UNW_ARM_D9: return "d9";
case UNW_ARM_D10: return "d10";
case UNW_ARM_D11: return "d11";
case UNW_ARM_D12: return "d12";
case UNW_ARM_D13: return "d13";
case UNW_ARM_D14: return "d14";
case UNW_ARM_D15: return "d15";
case UNW_ARM_D16: return "d16";
case UNW_ARM_D17: return "d17";
case UNW_ARM_D18: return "d18";
case UNW_ARM_D19: return "d19";
case UNW_ARM_D20: return "d20";
case UNW_ARM_D21: return "d21";
case UNW_ARM_D22: return "d22";
case UNW_ARM_D23: return "d23";
case UNW_ARM_D24: return "d24";
case UNW_ARM_D25: return "d25";
case UNW_ARM_D26: return "d26";
case UNW_ARM_D27: return "d27";
case UNW_ARM_D28: return "d28";
case UNW_ARM_D29: return "d29";
case UNW_ARM_D30: return "d30";
case UNW_ARM_D31: return "d31";
#endif
default:
_LIBUNWIND_ABORT("unsupported register");
}
}
template <typename A, typename R> bool UnwindCursor<A, R>::isSignalFrame() {
return false;
}
#else // !defined(_LIBUNWIND_SUPPORT_SEH_UNWIND) || !defined(_WIN32)
/// UnwindCursor contains all state (including all register values) during
/// an unwind. This is normally stack allocated inside a unw_cursor_t.
template <typename A, typename R>
class UnwindCursor : public AbstractUnwindCursor{
typedef typename A::pint_t pint_t;
public:
UnwindCursor(unw_context_t *context, A &as);
UnwindCursor(A &as, void *threadArg);
virtual ~UnwindCursor() {}
virtual bool validReg(int);
virtual unw_word_t getReg(int);
virtual void setReg(int, unw_word_t);
virtual bool validFloatReg(int);
virtual unw_fpreg_t getFloatReg(int);
virtual void setFloatReg(int, unw_fpreg_t);
virtual int step();
virtual void getInfo(unw_proc_info_t *);
virtual void jumpto();
virtual bool isSignalFrame();
virtual bool getFunctionName(char *buf, size_t len, unw_word_t *off);
virtual void setInfoBasedOnIPRegister(bool isReturnAddress = false);
virtual const char *getRegisterName(int num);
#ifdef __arm__
virtual void saveVFPAsX();
#endif
private:
#if defined(_LIBUNWIND_ARM_EHABI)
bool getInfoFromEHABISection(pint_t pc, const UnwindInfoSections &sects);
int stepWithEHABI() {
size_t len = 0;
size_t off = 0;
// FIXME: Calling decode_eht_entry() here is violating the libunwind
// abstraction layer.
const uint32_t *ehtp =
decode_eht_entry(reinterpret_cast<const uint32_t *>(_info.unwind_info),
&off, &len);
if (_Unwind_VRS_Interpret((_Unwind_Context *)this, ehtp, off, len) !=
_URC_CONTINUE_UNWIND)
return UNW_STEP_END;
return UNW_STEP_SUCCESS;
}
#endif
#if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
bool getInfoFromDwarfSection(pint_t pc, const UnwindInfoSections &sects,
uint32_t fdeSectionOffsetHint=0);
int stepWithDwarfFDE() {
return DwarfInstructions<A, R>::stepWithDwarf(_addressSpace,
(pint_t)this->getReg(UNW_REG_IP),
(pint_t)_info.unwind_info,
_registers);
}
#endif
#if defined(_LIBUNWIND_SUPPORT_COMPACT_UNWIND)
bool getInfoFromCompactEncodingSection(pint_t pc,
const UnwindInfoSections &sects);
int stepWithCompactEncoding() {
#if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
if ( compactSaysUseDwarf() )
return stepWithDwarfFDE();
#endif
R dummy;
return stepWithCompactEncoding(dummy);
}
#if defined(_LIBUNWIND_TARGET_X86_64)
int stepWithCompactEncoding(Registers_x86_64 &) {
return CompactUnwinder_x86_64<A>::stepWithCompactEncoding(
_info.format, _info.start_ip, _addressSpace, _registers);
}
#endif
#if defined(_LIBUNWIND_TARGET_I386)
int stepWithCompactEncoding(Registers_x86 &) {
return CompactUnwinder_x86<A>::stepWithCompactEncoding(
_info.format, (uint32_t)_info.start_ip, _addressSpace, _registers);
}
#endif
#if defined(_LIBUNWIND_TARGET_PPC)
int stepWithCompactEncoding(Registers_ppc &) {
return UNW_EINVAL;
}
#endif
#if defined(_LIBUNWIND_TARGET_PPC64)
int stepWithCompactEncoding(Registers_ppc64 &) {
return UNW_EINVAL;
}
#endif
#if defined(_LIBUNWIND_TARGET_AARCH64)
int stepWithCompactEncoding(Registers_arm64 &) {
return CompactUnwinder_arm64<A>::stepWithCompactEncoding(
_info.format, _info.start_ip, _addressSpace, _registers);
}
#endif
#if defined(_LIBUNWIND_TARGET_MIPS_O32)
int stepWithCompactEncoding(Registers_mips_o32 &) {
return UNW_EINVAL;
}
#endif
#if defined(_LIBUNWIND_TARGET_MIPS_NEWABI)
int stepWithCompactEncoding(Registers_mips_newabi &) {
return UNW_EINVAL;
}
#endif
bool compactSaysUseDwarf(uint32_t *offset=NULL) const {
R dummy;
return compactSaysUseDwarf(dummy, offset);
}
#if defined(_LIBUNWIND_TARGET_X86_64)
bool compactSaysUseDwarf(Registers_x86_64 &, uint32_t *offset) const {
if ((_info.format & UNWIND_X86_64_MODE_MASK) == UNWIND_X86_64_MODE_DWARF) {
if (offset)
*offset = (_info.format & UNWIND_X86_64_DWARF_SECTION_OFFSET);
return true;
}
return false;
}
#endif
#if defined(_LIBUNWIND_TARGET_I386)
bool compactSaysUseDwarf(Registers_x86 &, uint32_t *offset) const {
if ((_info.format & UNWIND_X86_MODE_MASK) == UNWIND_X86_MODE_DWARF) {
if (offset)
*offset = (_info.format & UNWIND_X86_DWARF_SECTION_OFFSET);
return true;
}
return false;
}
#endif
#if defined(_LIBUNWIND_TARGET_PPC)
bool compactSaysUseDwarf(Registers_ppc &, uint32_t *) const {
return true;
}
#endif
#if defined(_LIBUNWIND_TARGET_PPC64)
bool compactSaysUseDwarf(Registers_ppc64 &, uint32_t *) const {
return true;
}
#endif
#if defined(_LIBUNWIND_TARGET_AARCH64)
bool compactSaysUseDwarf(Registers_arm64 &, uint32_t *offset) const {
if ((_info.format & UNWIND_ARM64_MODE_MASK) == UNWIND_ARM64_MODE_DWARF) {
if (offset)
*offset = (_info.format & UNWIND_ARM64_DWARF_SECTION_OFFSET);
return true;
}
return false;
}
#endif
#if defined(_LIBUNWIND_TARGET_MIPS_O32)
bool compactSaysUseDwarf(Registers_mips_o32 &, uint32_t *) const {
return true;
}
#endif
#if defined(_LIBUNWIND_TARGET_MIPS_NEWABI)
bool compactSaysUseDwarf(Registers_mips_newabi &, uint32_t *) const {
return true;
}
#endif
#endif // defined(_LIBUNWIND_SUPPORT_COMPACT_UNWIND)
#if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
compact_unwind_encoding_t dwarfEncoding() const {
R dummy;
return dwarfEncoding(dummy);
}
#if defined(_LIBUNWIND_TARGET_X86_64)
compact_unwind_encoding_t dwarfEncoding(Registers_x86_64 &) const {
return UNWIND_X86_64_MODE_DWARF;
}
#endif
#if defined(_LIBUNWIND_TARGET_I386)
compact_unwind_encoding_t dwarfEncoding(Registers_x86 &) const {
return UNWIND_X86_MODE_DWARF;
}
#endif
#if defined(_LIBUNWIND_TARGET_PPC)
compact_unwind_encoding_t dwarfEncoding(Registers_ppc &) const {
return 0;
}
#endif
#if defined(_LIBUNWIND_TARGET_PPC64)
compact_unwind_encoding_t dwarfEncoding(Registers_ppc64 &) const {
return 0;
}
#endif
#if defined(_LIBUNWIND_TARGET_AARCH64)
compact_unwind_encoding_t dwarfEncoding(Registers_arm64 &) const {
return UNWIND_ARM64_MODE_DWARF;
}
#endif
#if defined(_LIBUNWIND_TARGET_ARM)
compact_unwind_encoding_t dwarfEncoding(Registers_arm &) const {
return 0;
}
#endif
#if defined (_LIBUNWIND_TARGET_OR1K)
compact_unwind_encoding_t dwarfEncoding(Registers_or1k &) const {
return 0;
}
#endif
#if defined (_LIBUNWIND_TARGET_MIPS_O32)
compact_unwind_encoding_t dwarfEncoding(Registers_mips_o32 &) const {
return 0;
}
#endif
#if defined (_LIBUNWIND_TARGET_MIPS_NEWABI)
compact_unwind_encoding_t dwarfEncoding(Registers_mips_newabi &) const {
return 0;
}
#endif
#endif // defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
#if defined(_LIBUNWIND_SUPPORT_SEH_UNWIND)
// For runtime environments using SEH unwind data without Windows runtime
// support.
pint_t getLastPC() const { /* FIXME: Implement */ return 0; }
void setLastPC(pint_t pc) { /* FIXME: Implement */ }
RUNTIME_FUNCTION *lookUpSEHUnwindInfo(pint_t pc, pint_t *base) {
/* FIXME: Implement */
*base = 0;
return nullptr;
}
bool getInfoFromSEH(pint_t pc);
int stepWithSEHData() { /* FIXME: Implement */ return 0; }
#endif // defined(_LIBUNWIND_SUPPORT_SEH_UNWIND)
A &_addressSpace;
R _registers;
unw_proc_info_t _info;
bool _unwindInfoMissing;
bool _isSignalFrame;
};
template <typename A, typename R>
UnwindCursor<A, R>::UnwindCursor(unw_context_t *context, A &as)
: _addressSpace(as), _registers(context), _unwindInfoMissing(false),
_isSignalFrame(false) {
static_assert((check_fit<UnwindCursor<A, R>, unw_cursor_t>::does_fit),
"UnwindCursor<> does not fit in unw_cursor_t");
memset(&_info, 0, sizeof(_info));
}
template <typename A, typename R>
UnwindCursor<A, R>::UnwindCursor(A &as, void *)
: _addressSpace(as), _unwindInfoMissing(false), _isSignalFrame(false) {
memset(&_info, 0, sizeof(_info));
// FIXME
// fill in _registers from thread arg
}
template <typename A, typename R>
bool UnwindCursor<A, R>::validReg(int regNum) {
return _registers.validRegister(regNum);
}
template <typename A, typename R>
unw_word_t UnwindCursor<A, R>::getReg(int regNum) {
return _registers.getRegister(regNum);
}
template <typename A, typename R>
void UnwindCursor<A, R>::setReg(int regNum, unw_word_t value) {
_registers.setRegister(regNum, (typename A::pint_t)value);
}
template <typename A, typename R>
bool UnwindCursor<A, R>::validFloatReg(int regNum) {
return _registers.validFloatRegister(regNum);
}
template <typename A, typename R>
unw_fpreg_t UnwindCursor<A, R>::getFloatReg(int regNum) {
return _registers.getFloatRegister(regNum);
}
template <typename A, typename R>
void UnwindCursor<A, R>::setFloatReg(int regNum, unw_fpreg_t value) {
_registers.setFloatRegister(regNum, value);
}
template <typename A, typename R> void UnwindCursor<A, R>::jumpto() {
_registers.jumpto();
}
#ifdef __arm__
template <typename A, typename R> void UnwindCursor<A, R>::saveVFPAsX() {
_registers.saveVFPAsX();
}
#endif
template <typename A, typename R>
const char *UnwindCursor<A, R>::getRegisterName(int regNum) {
return _registers.getRegisterName(regNum);
}
template <typename A, typename R> bool UnwindCursor<A, R>::isSignalFrame() {
return _isSignalFrame;
}
#endif // defined(_LIBUNWIND_SUPPORT_SEH_UNWIND)
#if defined(_LIBUNWIND_ARM_EHABI)
struct EHABIIndexEntry {
uint32_t functionOffset;
uint32_t data;
};
template<typename A>
struct EHABISectionIterator {
typedef EHABISectionIterator _Self;
typedef std::random_access_iterator_tag iterator_category;
typedef typename A::pint_t value_type;
typedef typename A::pint_t* pointer;
typedef typename A::pint_t& reference;
typedef size_t size_type;
typedef size_t difference_type;
static _Self begin(A& addressSpace, const UnwindInfoSections& sects) {
return _Self(addressSpace, sects, 0);
}
static _Self end(A& addressSpace, const UnwindInfoSections& sects) {
return _Self(addressSpace, sects,
sects.arm_section_length / sizeof(EHABIIndexEntry));
}
EHABISectionIterator(A& addressSpace, const UnwindInfoSections& sects, size_t i)
: _i(i), _addressSpace(&addressSpace), _sects(&sects) {}
_Self& operator++() { ++_i; return *this; }
_Self& operator+=(size_t a) { _i += a; return *this; }
_Self& operator--() { assert(_i > 0); --_i; return *this; }
_Self& operator-=(size_t a) { assert(_i >= a); _i -= a; return *this; }
_Self operator+(size_t a) { _Self out = *this; out._i += a; return out; }
_Self operator-(size_t a) { assert(_i >= a); _Self out = *this; out._i -= a; return out; }
size_t operator-(const _Self& other) { return _i - other._i; }
bool operator==(const _Self& other) const {
assert(_addressSpace == other._addressSpace);
assert(_sects == other._sects);
return _i == other._i;
}
typename A::pint_t operator*() const { return functionAddress(); }
typename A::pint_t functionAddress() const {
typename A::pint_t indexAddr = _sects->arm_section + arrayoffsetof(
EHABIIndexEntry, _i, functionOffset);
return indexAddr + signExtendPrel31(_addressSpace->get32(indexAddr));
}
typename A::pint_t dataAddress() {
typename A::pint_t indexAddr = _sects->arm_section + arrayoffsetof(
EHABIIndexEntry, _i, data);
return indexAddr;
}
private:
size_t _i;
A* _addressSpace;
const UnwindInfoSections* _sects;
};
template <typename A, typename R>
bool UnwindCursor<A, R>::getInfoFromEHABISection(
pint_t pc,
const UnwindInfoSections &sects) {
EHABISectionIterator<A> begin =
EHABISectionIterator<A>::begin(_addressSpace, sects);
EHABISectionIterator<A> end =
EHABISectionIterator<A>::end(_addressSpace, sects);
if (begin == end)
return false;
EHABISectionIterator<A> itNextPC = std::upper_bound(begin, end, pc);
if (itNextPC == begin)
return false;
EHABISectionIterator<A> itThisPC = itNextPC - 1;
pint_t thisPC = itThisPC.functionAddress();
// If an exception is thrown from a function, corresponding to the last entry
// in the table, we don't really know the function extent and have to choose a
// value for nextPC. Choosing max() will allow the range check during trace to
// succeed.
pint_t nextPC = (itNextPC == end) ? std::numeric_limits<pint_t>::max()
: itNextPC.functionAddress();
pint_t indexDataAddr = itThisPC.dataAddress();
if (indexDataAddr == 0)
return false;
uint32_t indexData = _addressSpace.get32(indexDataAddr);
if (indexData == UNW_EXIDX_CANTUNWIND)
return false;
// If the high bit is set, the exception handling table entry is inline inside
// the index table entry on the second word (aka |indexDataAddr|). Otherwise,
// the table points at an offset in the exception handling table (section 5 EHABI).
pint_t exceptionTableAddr;
uint32_t exceptionTableData;
bool isSingleWordEHT;
if (indexData & 0x80000000) {
exceptionTableAddr = indexDataAddr;
// TODO(ajwong): Should this data be 0?
exceptionTableData = indexData;
isSingleWordEHT = true;
} else {
exceptionTableAddr = indexDataAddr + signExtendPrel31(indexData);
exceptionTableData = _addressSpace.get32(exceptionTableAddr);
isSingleWordEHT = false;
}
// Now we know the 3 things:
// exceptionTableAddr -- exception handler table entry.
// exceptionTableData -- the data inside the first word of the eht entry.
// isSingleWordEHT -- whether the entry is in the index.
unw_word_t personalityRoutine = 0xbadf00d;
bool scope32 = false;
uintptr_t lsda;
// If the high bit in the exception handling table entry is set, the entry is
// in compact form (section 6.3 EHABI).
if (exceptionTableData & 0x80000000) {
// Grab the index of the personality routine from the compact form.
uint32_t choice = (exceptionTableData & 0x0f000000) >> 24;
uint32_t extraWords = 0;
switch (choice) {
case 0:
personalityRoutine = (unw_word_t) &__aeabi_unwind_cpp_pr0;
extraWords = 0;
scope32 = false;
lsda = isSingleWordEHT ? 0 : (exceptionTableAddr + 4);
break;
case 1:
personalityRoutine = (unw_word_t) &__aeabi_unwind_cpp_pr1;
extraWords = (exceptionTableData & 0x00ff0000) >> 16;
scope32 = false;
lsda = exceptionTableAddr + (extraWords + 1) * 4;
break;
case 2:
personalityRoutine = (unw_word_t) &__aeabi_unwind_cpp_pr2;
extraWords = (exceptionTableData & 0x00ff0000) >> 16;
scope32 = true;
lsda = exceptionTableAddr + (extraWords + 1) * 4;
break;
default:
_LIBUNWIND_ABORT("unknown personality routine");
return false;
}
if (isSingleWordEHT) {
if (extraWords != 0) {
_LIBUNWIND_ABORT("index inlined table detected but pr function "
"requires extra words");
return false;
}
}
} else {
pint_t personalityAddr =
exceptionTableAddr + signExtendPrel31(exceptionTableData);
personalityRoutine = personalityAddr;
// ARM EHABI # 6.2, # 9.2
//
// +---- ehtp
// v
// +--------------------------------------+
// | +--------+--------+--------+-------+ |
// | |0| prel31 to personalityRoutine | |
// | +--------+--------+--------+-------+ |
// | | N | unwind opcodes | | <-- UnwindData
// | +--------+--------+--------+-------+ |
// | | Word 2 unwind opcodes | |
// | +--------+--------+--------+-------+ |
// | ... |
// | +--------+--------+--------+-------+ |
// | | Word N unwind opcodes | |
// | +--------+--------+--------+-------+ |
// | | LSDA | | <-- lsda
// | | ... | |
// | +--------+--------+--------+-------+ |
// +--------------------------------------+
uint32_t *UnwindData = reinterpret_cast<uint32_t*>(exceptionTableAddr) + 1;
uint32_t FirstDataWord = *UnwindData;
size_t N = ((FirstDataWord >> 24) & 0xff);
size_t NDataWords = N + 1;
lsda = reinterpret_cast<uintptr_t>(UnwindData + NDataWords);
}
_info.start_ip = thisPC;
_info.end_ip = nextPC;
_info.handler = personalityRoutine;
_info.unwind_info = exceptionTableAddr;
_info.lsda = lsda;
// flags is pr_cache.additional. See EHABI #7.2 for definition of bit 0.
_info.flags = isSingleWordEHT ? 1 : 0 | scope32 ? 0x2 : 0; // Use enum?
return true;
}
#endif
#if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
template <typename A, typename R>
bool UnwindCursor<A, R>::getInfoFromDwarfSection(pint_t pc,
const UnwindInfoSections &sects,
uint32_t fdeSectionOffsetHint) {
typename CFI_Parser<A>::FDE_Info fdeInfo;
typename CFI_Parser<A>::CIE_Info cieInfo;
bool foundFDE = false;
bool foundInCache = false;
// If compact encoding table gave offset into dwarf section, go directly there
if (fdeSectionOffsetHint != 0) {
foundFDE = CFI_Parser<A>::findFDE(_addressSpace, pc, sects.dwarf_section,
(uint32_t)sects.dwarf_section_length,
sects.dwarf_section + fdeSectionOffsetHint,
&fdeInfo, &cieInfo);
}
#if defined(_LIBUNWIND_SUPPORT_DWARF_INDEX)
if (!foundFDE && (sects.dwarf_index_section != 0)) {
foundFDE = EHHeaderParser<A>::findFDE(
_addressSpace, pc, sects.dwarf_index_section,
(uint32_t)sects.dwarf_index_section_length, &fdeInfo, &cieInfo);
}
#endif
if (!foundFDE) {
// otherwise, search cache of previously found FDEs.
pint_t cachedFDE = DwarfFDECache<A>::findFDE(sects.dso_base, pc);
if (cachedFDE != 0) {
foundFDE =
CFI_Parser<A>::findFDE(_addressSpace, pc, sects.dwarf_section,
(uint32_t)sects.dwarf_section_length,
cachedFDE, &fdeInfo, &cieInfo);
foundInCache = foundFDE;
}
}
if (!foundFDE) {
// Still not found, do full scan of __eh_frame section.
foundFDE = CFI_Parser<A>::findFDE(_addressSpace, pc, sects.dwarf_section,
(uint32_t)sects.dwarf_section_length, 0,
&fdeInfo, &cieInfo);
}
if (foundFDE) {
typename CFI_Parser<A>::PrologInfo prolog;
if (CFI_Parser<A>::parseFDEInstructions(_addressSpace, fdeInfo, cieInfo, pc,
&prolog)) {
// Save off parsed FDE info
_info.start_ip = fdeInfo.pcStart;
_info.end_ip = fdeInfo.pcEnd;
_info.lsda = fdeInfo.lsda;
_info.handler = cieInfo.personality;
_info.gp = prolog.spExtraArgSize;
_info.flags = 0;
_info.format = dwarfEncoding();
_info.unwind_info = fdeInfo.fdeStart;
_info.unwind_info_size = (uint32_t)fdeInfo.fdeLength;
_info.extra = (unw_word_t) sects.dso_base;
// Add to cache (to make next lookup faster) if we had no hint
// and there was no index.
if (!foundInCache && (fdeSectionOffsetHint == 0)) {
#if defined(_LIBUNWIND_SUPPORT_DWARF_INDEX)
if (sects.dwarf_index_section == 0)
#endif
DwarfFDECache<A>::add(sects.dso_base, fdeInfo.pcStart, fdeInfo.pcEnd,
fdeInfo.fdeStart);
}
return true;
}
}
//_LIBUNWIND_DEBUG_LOG("can't find/use FDE for pc=0x%llX", (uint64_t)pc);
return false;
}
#endif // defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
#if defined(_LIBUNWIND_SUPPORT_COMPACT_UNWIND)
template <typename A, typename R>
bool UnwindCursor<A, R>::getInfoFromCompactEncodingSection(pint_t pc,
const UnwindInfoSections &sects) {
const bool log = false;
if (log)
fprintf(stderr, "getInfoFromCompactEncodingSection(pc=0x%llX, mh=0x%llX)\n",
(uint64_t)pc, (uint64_t)sects.dso_base);
const UnwindSectionHeader<A> sectionHeader(_addressSpace,
sects.compact_unwind_section);
if (sectionHeader.version() != UNWIND_SECTION_VERSION)
return false;
// do a binary search of top level index to find page with unwind info
pint_t targetFunctionOffset = pc - sects.dso_base;
const UnwindSectionIndexArray<A> topIndex(_addressSpace,
sects.compact_unwind_section
+ sectionHeader.indexSectionOffset());
uint32_t low = 0;
uint32_t high = sectionHeader.indexCount();
uint32_t last = high - 1;
while (low < high) {
uint32_t mid = (low + high) / 2;
//if ( log ) fprintf(stderr, "\tmid=%d, low=%d, high=%d, *mid=0x%08X\n",
//mid, low, high, topIndex.functionOffset(mid));
if (topIndex.functionOffset(mid) <= targetFunctionOffset) {
if ((mid == last) ||
(topIndex.functionOffset(mid + 1) > targetFunctionOffset)) {
low = mid;
break;
} else {
low = mid + 1;
}
} else {
high = mid;
}
}
const uint32_t firstLevelFunctionOffset = topIndex.functionOffset(low);
const uint32_t firstLevelNextPageFunctionOffset =
topIndex.functionOffset(low + 1);
const pint_t secondLevelAddr =
sects.compact_unwind_section + topIndex.secondLevelPagesSectionOffset(low);
const pint_t lsdaArrayStartAddr =
sects.compact_unwind_section + topIndex.lsdaIndexArraySectionOffset(low);
const pint_t lsdaArrayEndAddr =
sects.compact_unwind_section + topIndex.lsdaIndexArraySectionOffset(low+1);
if (log)
fprintf(stderr, "\tfirst level search for result index=%d "
"to secondLevelAddr=0x%llX\n",
low, (uint64_t) secondLevelAddr);
// do a binary search of second level page index
uint32_t encoding = 0;
pint_t funcStart = 0;
pint_t funcEnd = 0;
pint_t lsda = 0;
pint_t personality = 0;
uint32_t pageKind = _addressSpace.get32(secondLevelAddr);
if (pageKind == UNWIND_SECOND_LEVEL_REGULAR) {
// regular page
UnwindSectionRegularPageHeader<A> pageHeader(_addressSpace,
secondLevelAddr);
UnwindSectionRegularArray<A> pageIndex(
_addressSpace, secondLevelAddr + pageHeader.entryPageOffset());
// binary search looks for entry with e where index[e].offset <= pc <
// index[e+1].offset
if (log)
fprintf(stderr, "\tbinary search for targetFunctionOffset=0x%08llX in "
"regular page starting at secondLevelAddr=0x%llX\n",
(uint64_t) targetFunctionOffset, (uint64_t) secondLevelAddr);
low = 0;
high = pageHeader.entryCount();
while (low < high) {
uint32_t mid = (low + high) / 2;
if (pageIndex.functionOffset(mid) <= targetFunctionOffset) {
if (mid == (uint32_t)(pageHeader.entryCount() - 1)) {
// at end of table
low = mid;
funcEnd = firstLevelNextPageFunctionOffset + sects.dso_base;
break;
} else if (pageIndex.functionOffset(mid + 1) > targetFunctionOffset) {
// next is too big, so we found it
low = mid;
funcEnd = pageIndex.functionOffset(low + 1) + sects.dso_base;
break;
} else {
low = mid + 1;
}
} else {
high = mid;
}
}
encoding = pageIndex.encoding(low);
funcStart = pageIndex.functionOffset(low) + sects.dso_base;
if (pc < funcStart) {
if (log)
fprintf(
stderr,
"\tpc not in table, pc=0x%llX, funcStart=0x%llX, funcEnd=0x%llX\n",
(uint64_t) pc, (uint64_t) funcStart, (uint64_t) funcEnd);
return false;
}
if (pc > funcEnd) {
if (log)
fprintf(
stderr,
"\tpc not in table, pc=0x%llX, funcStart=0x%llX, funcEnd=0x%llX\n",
(uint64_t) pc, (uint64_t) funcStart, (uint64_t) funcEnd);
return false;
}
} else if (pageKind == UNWIND_SECOND_LEVEL_COMPRESSED) {
// compressed page
UnwindSectionCompressedPageHeader<A> pageHeader(_addressSpace,
secondLevelAddr);
UnwindSectionCompressedArray<A> pageIndex(
_addressSpace, secondLevelAddr + pageHeader.entryPageOffset());
const uint32_t targetFunctionPageOffset =
(uint32_t)(targetFunctionOffset - firstLevelFunctionOffset);
// binary search looks for entry with e where index[e].offset <= pc <
// index[e+1].offset
if (log)
fprintf(stderr, "\tbinary search of compressed page starting at "
"secondLevelAddr=0x%llX\n",
(uint64_t) secondLevelAddr);
low = 0;
last = pageHeader.entryCount() - 1;
high = pageHeader.entryCount();
while (low < high) {
uint32_t mid = (low + high) / 2;
if (pageIndex.functionOffset(mid) <= targetFunctionPageOffset) {
if ((mid == last) ||
(pageIndex.functionOffset(mid + 1) > targetFunctionPageOffset)) {
low = mid;
break;
} else {
low = mid + 1;
}
} else {
high = mid;
}
}
funcStart = pageIndex.functionOffset(low) + firstLevelFunctionOffset
+ sects.dso_base;
if (low < last)
funcEnd =
pageIndex.functionOffset(low + 1) + firstLevelFunctionOffset
+ sects.dso_base;
else
funcEnd = firstLevelNextPageFunctionOffset + sects.dso_base;
if (pc < funcStart) {
_LIBUNWIND_DEBUG_LOG("malformed __unwind_info, pc=0x%llX not in second "
"level compressed unwind table. funcStart=0x%llX",
(uint64_t) pc, (uint64_t) funcStart);
return false;
}
if (pc > funcEnd) {
_LIBUNWIND_DEBUG_LOG("malformed __unwind_info, pc=0x%llX not in second "
"level compressed unwind table. funcEnd=0x%llX",
(uint64_t) pc, (uint64_t) funcEnd);
return false;
}
uint16_t encodingIndex = pageIndex.encodingIndex(low);
if (encodingIndex < sectionHeader.commonEncodingsArrayCount()) {
// encoding is in common table in section header
encoding = _addressSpace.get32(
sects.compact_unwind_section +
sectionHeader.commonEncodingsArraySectionOffset() +
encodingIndex * sizeof(uint32_t));
} else {
// encoding is in page specific table
uint16_t pageEncodingIndex =
encodingIndex - (uint16_t)sectionHeader.commonEncodingsArrayCount();
encoding = _addressSpace.get32(secondLevelAddr +
pageHeader.encodingsPageOffset() +
pageEncodingIndex * sizeof(uint32_t));
}
} else {
_LIBUNWIND_DEBUG_LOG("malformed __unwind_info at 0x%0llX bad second "
"level page",
(uint64_t) sects.compact_unwind_section);
return false;
}
// look up LSDA, if encoding says function has one
if (encoding & UNWIND_HAS_LSDA) {
UnwindSectionLsdaArray<A> lsdaIndex(_addressSpace, lsdaArrayStartAddr);
uint32_t funcStartOffset = (uint32_t)(funcStart - sects.dso_base);
low = 0;
high = (uint32_t)(lsdaArrayEndAddr - lsdaArrayStartAddr) /
sizeof(unwind_info_section_header_lsda_index_entry);
// binary search looks for entry with exact match for functionOffset
if (log)
fprintf(stderr,
"\tbinary search of lsda table for targetFunctionOffset=0x%08X\n",
funcStartOffset);
while (low < high) {
uint32_t mid = (low + high) / 2;
if (lsdaIndex.functionOffset(mid) == funcStartOffset) {
lsda = lsdaIndex.lsdaOffset(mid) + sects.dso_base;
break;
} else if (lsdaIndex.functionOffset(mid) < funcStartOffset) {
low = mid + 1;
} else {
high = mid;
}
}
if (lsda == 0) {
_LIBUNWIND_DEBUG_LOG("found encoding 0x%08X with HAS_LSDA bit set for "
"pc=0x%0llX, but lsda table has no entry",
encoding, (uint64_t) pc);
return false;
}
}
// extact personality routine, if encoding says function has one
uint32_t personalityIndex = (encoding & UNWIND_PERSONALITY_MASK) >>
(__builtin_ctz(UNWIND_PERSONALITY_MASK));
if (personalityIndex != 0) {
--personalityIndex; // change 1-based to zero-based index
if (personalityIndex > sectionHeader.personalityArrayCount()) {
_LIBUNWIND_DEBUG_LOG("found encoding 0x%08X with personality index %d, "
"but personality table has only %d entires",
encoding, personalityIndex,
sectionHeader.personalityArrayCount());
return false;
}
int32_t personalityDelta = (int32_t)_addressSpace.get32(
sects.compact_unwind_section +
sectionHeader.personalityArraySectionOffset() +
personalityIndex * sizeof(uint32_t));
pint_t personalityPointer = sects.dso_base + (pint_t)personalityDelta;
personality = _addressSpace.getP(personalityPointer);
if (log)
fprintf(stderr, "getInfoFromCompactEncodingSection(pc=0x%llX), "
"personalityDelta=0x%08X, personality=0x%08llX\n",
(uint64_t) pc, personalityDelta, (uint64_t) personality);
}
if (log)
fprintf(stderr, "getInfoFromCompactEncodingSection(pc=0x%llX), "
"encoding=0x%08X, lsda=0x%08llX for funcStart=0x%llX\n",
(uint64_t) pc, encoding, (uint64_t) lsda, (uint64_t) funcStart);
_info.start_ip = funcStart;
_info.end_ip = funcEnd;
_info.lsda = lsda;
_info.handler = personality;
_info.gp = 0;
_info.flags = 0;
_info.format = encoding;
_info.unwind_info = 0;
_info.unwind_info_size = 0;
_info.extra = sects.dso_base;
return true;
}
#endif // defined(_LIBUNWIND_SUPPORT_COMPACT_UNWIND)
#if defined(_LIBUNWIND_SUPPORT_SEH_UNWIND)
template <typename A, typename R>
bool UnwindCursor<A, R>::getInfoFromSEH(pint_t pc) {
pint_t base;
RUNTIME_FUNCTION *unwindEntry = lookUpSEHUnwindInfo(pc, &base);
if (!unwindEntry) {
_LIBUNWIND_DEBUG_LOG("\tpc not in table, pc=0x%llX", (uint64_t) pc);
return false;
}
_info.gp = 0;
_info.flags = 0;
_info.format = 0;
_info.unwind_info_size = sizeof(RUNTIME_FUNCTION);
_info.unwind_info = reinterpret_cast<unw_word_t>(unwindEntry);
_info.extra = base;
_info.start_ip = base + unwindEntry->BeginAddress;
#ifdef _LIBUNWIND_TARGET_X86_64
_info.end_ip = base + unwindEntry->EndAddress;
// Only fill in the handler and LSDA if they're stale.
if (pc != getLastPC()) {
UNWIND_INFO *xdata = reinterpret_cast<UNWIND_INFO *>(base + unwindEntry->UnwindData);
if (xdata->Flags & (UNW_FLAG_EHANDLER|UNW_FLAG_UHANDLER)) {
// The personality is given in the UNWIND_INFO itself. The LSDA immediately
// follows the UNWIND_INFO. (This follows how both Clang and MSVC emit
// these structures.)
// N.B. UNWIND_INFO structs are DWORD-aligned.
uint32_t lastcode = (xdata->CountOfCodes + 1) & ~1;
const uint32_t *handler = reinterpret_cast<uint32_t *>(&xdata->UnwindCodes[lastcode]);
_info.lsda = reinterpret_cast<unw_word_t>(handler+1);
if (*handler) {
_info.handler = reinterpret_cast<unw_word_t>(__libunwind_seh_personality);
} else
_info.handler = 0;
} else {
_info.lsda = 0;
_info.handler = 0;
}
}
#elif defined(_LIBUNWIND_TARGET_ARM)
_info.end_ip = _info.start_ip + unwindEntry->FunctionLength;
_info.lsda = 0; // FIXME
_info.handler = 0; // FIXME
#endif
setLastPC(pc);
return true;
}
#endif
template <typename A, typename R>
void UnwindCursor<A, R>::setInfoBasedOnIPRegister(bool isReturnAddress) {
pint_t pc = (pint_t)this->getReg(UNW_REG_IP);
#if defined(_LIBUNWIND_ARM_EHABI)
// Remove the thumb bit so the IP represents the actual instruction address.
// This matches the behaviour of _Unwind_GetIP on arm.
pc &= (pint_t)~0x1;
#endif
// If the last line of a function is a "throw" the compiler sometimes
// emits no instructions after the call to __cxa_throw. This means
// the return address is actually the start of the next function.
// To disambiguate this, back up the pc when we know it is a return
// address.
if (isReturnAddress)
--pc;
// Ask address space object to find unwind sections for this pc.
UnwindInfoSections sects;
if (_addressSpace.findUnwindSections(pc, sects)) {
#if defined(_LIBUNWIND_SUPPORT_COMPACT_UNWIND)
// If there is a compact unwind encoding table, look there first.
if (sects.compact_unwind_section != 0) {
if (this->getInfoFromCompactEncodingSection(pc, sects)) {
#if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
// Found info in table, done unless encoding says to use dwarf.
uint32_t dwarfOffset;
if ((sects.dwarf_section != 0) && compactSaysUseDwarf(&dwarfOffset)) {
if (this->getInfoFromDwarfSection(pc, sects, dwarfOffset)) {
// found info in dwarf, done
return;
}
}
#endif
// If unwind table has entry, but entry says there is no unwind info,
// record that we have no unwind info.
if (_info.format == 0)
_unwindInfoMissing = true;
return;
}
}
#endif // defined(_LIBUNWIND_SUPPORT_COMPACT_UNWIND)
#if defined(_LIBUNWIND_SUPPORT_SEH_UNWIND)
// If there is SEH unwind info, look there next.
if (this->getInfoFromSEH(pc))
return;
#endif
#if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
// If there is dwarf unwind info, look there next.
if (sects.dwarf_section != 0) {
if (this->getInfoFromDwarfSection(pc, sects)) {
// found info in dwarf, done
return;
}
}
#endif
#if defined(_LIBUNWIND_ARM_EHABI)
// If there is ARM EHABI unwind info, look there next.
if (sects.arm_section != 0 && this->getInfoFromEHABISection(pc, sects))
return;
#endif
}
#if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
// There is no static unwind info for this pc. Look to see if an FDE was
// dynamically registered for it.
pint_t cachedFDE = DwarfFDECache<A>::findFDE(0, pc);
if (cachedFDE != 0) {
CFI_Parser<LocalAddressSpace>::FDE_Info fdeInfo;
CFI_Parser<LocalAddressSpace>::CIE_Info cieInfo;
const char *msg = CFI_Parser<A>::decodeFDE(_addressSpace,
cachedFDE, &fdeInfo, &cieInfo);
if (msg == NULL) {
typename CFI_Parser<A>::PrologInfo prolog;
if (CFI_Parser<A>::parseFDEInstructions(_addressSpace, fdeInfo, cieInfo,
pc, &prolog)) {
// save off parsed FDE info
_info.start_ip = fdeInfo.pcStart;
_info.end_ip = fdeInfo.pcEnd;
_info.lsda = fdeInfo.lsda;
_info.handler = cieInfo.personality;
_info.gp = prolog.spExtraArgSize;
// Some frameless functions need SP
// altered when resuming in function.
_info.flags = 0;
_info.format = dwarfEncoding();
_info.unwind_info = fdeInfo.fdeStart;
_info.unwind_info_size = (uint32_t)fdeInfo.fdeLength;
_info.extra = 0;
return;
}
}
}
// Lastly, ask AddressSpace object about platform specific ways to locate
// other FDEs.
pint_t fde;
if (_addressSpace.findOtherFDE(pc, fde)) {
CFI_Parser<LocalAddressSpace>::FDE_Info fdeInfo;
CFI_Parser<LocalAddressSpace>::CIE_Info cieInfo;
if (!CFI_Parser<A>::decodeFDE(_addressSpace, fde, &fdeInfo, &cieInfo)) {
// Double check this FDE is for a function that includes the pc.
if ((fdeInfo.pcStart <= pc) && (pc < fdeInfo.pcEnd)) {
typename CFI_Parser<A>::PrologInfo prolog;
if (CFI_Parser<A>::parseFDEInstructions(_addressSpace, fdeInfo,
cieInfo, pc, &prolog)) {
// save off parsed FDE info
_info.start_ip = fdeInfo.pcStart;
_info.end_ip = fdeInfo.pcEnd;
_info.lsda = fdeInfo.lsda;
_info.handler = cieInfo.personality;
_info.gp = prolog.spExtraArgSize;
_info.flags = 0;
_info.format = dwarfEncoding();
_info.unwind_info = fdeInfo.fdeStart;
_info.unwind_info_size = (uint32_t)fdeInfo.fdeLength;
_info.extra = 0;
return;
}
}
}
}
#endif // #if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
// no unwind info, flag that we can't reliably unwind
_unwindInfoMissing = true;
}
template <typename A, typename R>
int UnwindCursor<A, R>::step() {
// Bottom of stack is defined is when unwind info cannot be found.
if (_unwindInfoMissing)
return UNW_STEP_END;
// Use unwinding info to modify register set as if function returned.
int result;
#if defined(_LIBUNWIND_SUPPORT_COMPACT_UNWIND)
result = this->stepWithCompactEncoding();
#elif defined(_LIBUNWIND_SUPPORT_SEH_UNWIND)
result = this->stepWithSEHData();
#elif defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
result = this->stepWithDwarfFDE();
#elif defined(_LIBUNWIND_ARM_EHABI)
result = this->stepWithEHABI();
#else
#error Need _LIBUNWIND_SUPPORT_COMPACT_UNWIND or \
_LIBUNWIND_SUPPORT_SEH_UNWIND or \
_LIBUNWIND_SUPPORT_DWARF_UNWIND or \
_LIBUNWIND_ARM_EHABI
#endif
// update info based on new PC
if (result == UNW_STEP_SUCCESS) {
this->setInfoBasedOnIPRegister(true);
if (_unwindInfoMissing)
return UNW_STEP_END;
}
return result;
}
template <typename A, typename R>
void UnwindCursor<A, R>::getInfo(unw_proc_info_t *info) {
*info = _info;
}
template <typename A, typename R>
bool UnwindCursor<A, R>::getFunctionName(char *buf, size_t bufLen,
unw_word_t *offset) {
return _addressSpace.findFunctionName((pint_t)this->getReg(UNW_REG_IP),
buf, bufLen, offset);
}
} // namespace libunwind
#endif // __UNWINDCURSOR_HPP__
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