| //===--------------------------- libunwind.cpp ----------------------------===// |
| // |
| // 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. |
| // |
| // |
| // Implements unw_* functions from <libunwind.h> |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include <libunwind.h> |
| |
| #ifndef NDEBUG |
| #include <cstdlib> // getenv |
| #endif |
| #include <new> |
| #include <algorithm> |
| |
| #include "libunwind_ext.h" |
| #include "config.h" |
| |
| #include <stdlib.h> |
| |
| |
| #if !defined(__USING_SJLJ_EXCEPTIONS__) |
| #include "AddressSpace.hpp" |
| #include "UnwindCursor.hpp" |
| |
| using namespace libunwind; |
| |
| /// internal object to represent this processes address space |
| LocalAddressSpace LocalAddressSpace::sThisAddressSpace; |
| |
| _LIBUNWIND_EXPORT unw_addr_space_t unw_local_addr_space = |
| (unw_addr_space_t)&LocalAddressSpace::sThisAddressSpace; |
| |
| /// record the registers and stack position of the caller |
| extern int unw_getcontext(unw_context_t *); |
| // note: unw_getcontext() implemented in assembly |
| |
| /// Create a cursor of a thread in this process given 'context' recorded by |
| /// unw_getcontext(). |
| _LIBUNWIND_EXPORT int unw_init_local(unw_cursor_t *cursor, |
| unw_context_t *context) { |
| _LIBUNWIND_TRACE_API("unw_init_local(cursor=%p, context=%p)", |
| static_cast<void *>(cursor), |
| static_cast<void *>(context)); |
| #if defined(__i386__) |
| # define REGISTER_KIND Registers_x86 |
| #elif defined(__x86_64__) |
| # define REGISTER_KIND Registers_x86_64 |
| #elif defined(__ppc__) |
| # define REGISTER_KIND Registers_ppc |
| #elif defined(__aarch64__) |
| # define REGISTER_KIND Registers_arm64 |
| #elif defined(__arm__) |
| # define REGISTER_KIND Registers_arm |
| #elif defined(__or1k__) |
| # define REGISTER_KIND Registers_or1k |
| #elif defined(__mips__) && defined(_ABIO32) && defined(__mips_soft_float) |
| # define REGISTER_KIND Registers_mips_o32 |
| #elif defined(__mips__) && defined(_ABI64) && defined(__mips_soft_float) |
| # define REGISTER_KIND Registers_mips_n64 |
| #elif defined(__mips__) |
| # warning The MIPS architecture is not supported with this ABI and environment! |
| #else |
| # error Architecture not supported |
| #endif |
| // Use "placement new" to allocate UnwindCursor in the cursor buffer. |
| new ((void *)cursor) UnwindCursor<LocalAddressSpace, REGISTER_KIND>( |
| context, LocalAddressSpace::sThisAddressSpace); |
| #undef REGISTER_KIND |
| AbstractUnwindCursor *co = (AbstractUnwindCursor *)cursor; |
| co->setInfoBasedOnIPRegister(); |
| |
| return UNW_ESUCCESS; |
| } |
| |
| #ifdef UNW_REMOTE |
| /// Create a cursor into a thread in another process. |
| _LIBUNWIND_EXPORT int unw_init_remote_thread(unw_cursor_t *cursor, |
| unw_addr_space_t as, |
| void *arg) { |
| // special case: unw_init_remote(xx, unw_local_addr_space, xx) |
| if (as == (unw_addr_space_t)&LocalAddressSpace::sThisAddressSpace) |
| return unw_init_local(cursor, NULL); //FIXME |
| |
| // use "placement new" to allocate UnwindCursor in the cursor buffer |
| switch (as->cpuType) { |
| case CPU_TYPE_I386: |
| new ((void *)cursor) |
| UnwindCursor<RemoteAddressSpace<Pointer32<LittleEndian>>, |
| Registers_x86>(((unw_addr_space_i386 *)as)->oas, arg); |
| break; |
| case CPU_TYPE_X86_64: |
| new ((void *)cursor) |
| UnwindCursor<RemoteAddressSpace<Pointer64<LittleEndian>>, |
| Registers_x86_64>(((unw_addr_space_x86_64 *)as)->oas, arg); |
| break; |
| case CPU_TYPE_POWERPC: |
| new ((void *)cursor) |
| UnwindCursor<RemoteAddressSpace<Pointer32<BigEndian>>, |
| Registers_ppc>(((unw_addr_space_ppc *)as)->oas, arg); |
| break; |
| default: |
| return UNW_EUNSPEC; |
| } |
| return UNW_ESUCCESS; |
| } |
| |
| |
| static bool is64bit(task_t task) { |
| return false; // FIXME |
| } |
| |
| /// Create an address_space object for use in examining another task. |
| _LIBUNWIND_EXPORT unw_addr_space_t unw_create_addr_space_for_task(task_t task) { |
| #if __i386__ |
| if (is64bit(task)) { |
| unw_addr_space_x86_64 *as = new unw_addr_space_x86_64(task); |
| as->taskPort = task; |
| as->cpuType = CPU_TYPE_X86_64; |
| //as->oas |
| } else { |
| unw_addr_space_i386 *as = new unw_addr_space_i386(task); |
| as->taskPort = task; |
| as->cpuType = CPU_TYPE_I386; |
| //as->oas |
| } |
| #else |
| // FIXME |
| #endif |
| } |
| |
| |
| /// Delete an address_space object. |
| _LIBUNWIND_EXPORT void unw_destroy_addr_space(unw_addr_space_t asp) { |
| switch (asp->cpuType) { |
| #if __i386__ || __x86_64__ |
| case CPU_TYPE_I386: { |
| unw_addr_space_i386 *as = (unw_addr_space_i386 *)asp; |
| delete as; |
| } |
| break; |
| case CPU_TYPE_X86_64: { |
| unw_addr_space_x86_64 *as = (unw_addr_space_x86_64 *)asp; |
| delete as; |
| } |
| break; |
| #endif |
| case CPU_TYPE_POWERPC: { |
| unw_addr_space_ppc *as = (unw_addr_space_ppc *)asp; |
| delete as; |
| } |
| break; |
| } |
| } |
| #endif // UNW_REMOTE |
| |
| |
| /// Get value of specified register at cursor position in stack frame. |
| _LIBUNWIND_EXPORT int unw_get_reg(unw_cursor_t *cursor, unw_regnum_t regNum, |
| unw_word_t *value) { |
| _LIBUNWIND_TRACE_API("unw_get_reg(cursor=%p, regNum=%d, &value=%p)", |
| static_cast<void *>(cursor), regNum, |
| static_cast<void *>(value)); |
| AbstractUnwindCursor *co = (AbstractUnwindCursor *)cursor; |
| if (co->validReg(regNum)) { |
| *value = co->getReg(regNum); |
| return UNW_ESUCCESS; |
| } |
| return UNW_EBADREG; |
| } |
| |
| |
| /// Set value of specified register at cursor position in stack frame. |
| _LIBUNWIND_EXPORT int unw_set_reg(unw_cursor_t *cursor, unw_regnum_t regNum, |
| unw_word_t value) { |
| _LIBUNWIND_TRACE_API("unw_set_reg(cursor=%p, regNum=%d, value=0x%" PRIxPTR ")", |
| static_cast<void *>(cursor), regNum, value); |
| typedef LocalAddressSpace::pint_t pint_t; |
| AbstractUnwindCursor *co = (AbstractUnwindCursor *)cursor; |
| if (co->validReg(regNum)) { |
| co->setReg(regNum, (pint_t)value); |
| // specical case altering IP to re-find info (being called by personality |
| // function) |
| if (regNum == UNW_REG_IP) |
| co->setInfoBasedOnIPRegister(false); |
| return UNW_ESUCCESS; |
| } |
| return UNW_EBADREG; |
| } |
| |
| |
| /// Get value of specified float register at cursor position in stack frame. |
| _LIBUNWIND_EXPORT int unw_get_fpreg(unw_cursor_t *cursor, unw_regnum_t regNum, |
| unw_fpreg_t *value) { |
| _LIBUNWIND_TRACE_API("unw_get_fpreg(cursor=%p, regNum=%d, &value=%p)", |
| static_cast<void *>(cursor), regNum, |
| static_cast<void *>(value)); |
| AbstractUnwindCursor *co = (AbstractUnwindCursor *)cursor; |
| if (co->validFloatReg(regNum)) { |
| *value = co->getFloatReg(regNum); |
| return UNW_ESUCCESS; |
| } |
| return UNW_EBADREG; |
| } |
| |
| |
| /// Set value of specified float register at cursor position in stack frame. |
| _LIBUNWIND_EXPORT int unw_set_fpreg(unw_cursor_t *cursor, unw_regnum_t regNum, |
| unw_fpreg_t value) { |
| #if defined(_LIBUNWIND_ARM_EHABI) |
| _LIBUNWIND_TRACE_API("unw_set_fpreg(cursor=%p, regNum=%d, value=%llX)", |
| static_cast<void *>(cursor), regNum, value); |
| #else |
| _LIBUNWIND_TRACE_API("unw_set_fpreg(cursor=%p, regNum=%d, value=%g)", |
| static_cast<void *>(cursor), regNum, value); |
| #endif |
| AbstractUnwindCursor *co = (AbstractUnwindCursor *)cursor; |
| if (co->validFloatReg(regNum)) { |
| co->setFloatReg(regNum, value); |
| return UNW_ESUCCESS; |
| } |
| return UNW_EBADREG; |
| } |
| |
| |
| /// Move cursor to next frame. |
| _LIBUNWIND_EXPORT int unw_step(unw_cursor_t *cursor) { |
| _LIBUNWIND_TRACE_API("unw_step(cursor=%p)", static_cast<void *>(cursor)); |
| AbstractUnwindCursor *co = (AbstractUnwindCursor *)cursor; |
| return co->step(); |
| } |
| |
| |
| /// Get unwind info at cursor position in stack frame. |
| _LIBUNWIND_EXPORT int unw_get_proc_info(unw_cursor_t *cursor, |
| unw_proc_info_t *info) { |
| _LIBUNWIND_TRACE_API("unw_get_proc_info(cursor=%p, &info=%p)", |
| static_cast<void *>(cursor), static_cast<void *>(info)); |
| AbstractUnwindCursor *co = (AbstractUnwindCursor *)cursor; |
| co->getInfo(info); |
| if (info->end_ip == 0) |
| return UNW_ENOINFO; |
| else |
| return UNW_ESUCCESS; |
| } |
| |
| |
| /// Resume execution at cursor position (aka longjump). |
| _LIBUNWIND_EXPORT int unw_resume(unw_cursor_t *cursor) { |
| _LIBUNWIND_TRACE_API("unw_resume(cursor=%p)", static_cast<void *>(cursor)); |
| AbstractUnwindCursor *co = (AbstractUnwindCursor *)cursor; |
| co->jumpto(); |
| return UNW_EUNSPEC; |
| } |
| |
| |
| /// Get name of function at cursor position in stack frame. |
| _LIBUNWIND_EXPORT int unw_get_proc_name(unw_cursor_t *cursor, char *buf, |
| size_t bufLen, unw_word_t *offset) { |
| _LIBUNWIND_TRACE_API("unw_get_proc_name(cursor=%p, &buf=%p, bufLen=%lu)", |
| static_cast<void *>(cursor), static_cast<void *>(buf), |
| static_cast<unsigned long>(bufLen)); |
| AbstractUnwindCursor *co = (AbstractUnwindCursor *)cursor; |
| if (co->getFunctionName(buf, bufLen, offset)) |
| return UNW_ESUCCESS; |
| else |
| return UNW_EUNSPEC; |
| } |
| |
| |
| /// Checks if a register is a floating-point register. |
| _LIBUNWIND_EXPORT int unw_is_fpreg(unw_cursor_t *cursor, unw_regnum_t regNum) { |
| _LIBUNWIND_TRACE_API("unw_is_fpreg(cursor=%p, regNum=%d)", |
| static_cast<void *>(cursor), regNum); |
| AbstractUnwindCursor *co = (AbstractUnwindCursor *)cursor; |
| return co->validFloatReg(regNum); |
| } |
| |
| |
| /// Checks if a register is a floating-point register. |
| _LIBUNWIND_EXPORT const char *unw_regname(unw_cursor_t *cursor, |
| unw_regnum_t regNum) { |
| _LIBUNWIND_TRACE_API("unw_regname(cursor=%p, regNum=%d)", |
| static_cast<void *>(cursor), regNum); |
| AbstractUnwindCursor *co = (AbstractUnwindCursor *)cursor; |
| return co->getRegisterName(regNum); |
| } |
| |
| |
| /// Checks if current frame is signal trampoline. |
| _LIBUNWIND_EXPORT int unw_is_signal_frame(unw_cursor_t *cursor) { |
| _LIBUNWIND_TRACE_API("unw_is_signal_frame(cursor=%p)", |
| static_cast<void *>(cursor)); |
| AbstractUnwindCursor *co = (AbstractUnwindCursor *)cursor; |
| return co->isSignalFrame(); |
| } |
| |
| #ifdef __arm__ |
| // Save VFP registers d0-d15 using FSTMIADX instead of FSTMIADD |
| _LIBUNWIND_EXPORT void unw_save_vfp_as_X(unw_cursor_t *cursor) { |
| _LIBUNWIND_TRACE_API("unw_fpreg_save_vfp_as_X(cursor=%p)", |
| static_cast<void *>(cursor)); |
| AbstractUnwindCursor *co = (AbstractUnwindCursor *)cursor; |
| return co->saveVFPAsX(); |
| } |
| #endif |
| |
| |
| #if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND) |
| /// SPI: walks cached DWARF entries |
| _LIBUNWIND_EXPORT void unw_iterate_dwarf_unwind_cache(void (*func)( |
| unw_word_t ip_start, unw_word_t ip_end, unw_word_t fde, unw_word_t mh)) { |
| _LIBUNWIND_TRACE_API("unw_iterate_dwarf_unwind_cache(func=%p)", |
| reinterpret_cast<void *>(func)); |
| DwarfFDECache<LocalAddressSpace>::iterateCacheEntries(func); |
| } |
| |
| |
| /// IPI: for __register_frame() |
| void _unw_add_dynamic_fde(unw_word_t fde) { |
| CFI_Parser<LocalAddressSpace>::FDE_Info fdeInfo; |
| CFI_Parser<LocalAddressSpace>::CIE_Info cieInfo; |
| const char *message = CFI_Parser<LocalAddressSpace>::decodeFDE( |
| LocalAddressSpace::sThisAddressSpace, |
| (LocalAddressSpace::pint_t) fde, &fdeInfo, &cieInfo); |
| if (message == NULL) { |
| // dynamically registered FDEs don't have a mach_header group they are in. |
| // Use fde as mh_group |
| unw_word_t mh_group = fdeInfo.fdeStart; |
| DwarfFDECache<LocalAddressSpace>::add((LocalAddressSpace::pint_t)mh_group, |
| fdeInfo.pcStart, fdeInfo.pcEnd, |
| fdeInfo.fdeStart); |
| } else { |
| _LIBUNWIND_DEBUG_LOG("_unw_add_dynamic_fde: bad fde: %s", message); |
| } |
| } |
| |
| /// IPI: for __deregister_frame() |
| void _unw_remove_dynamic_fde(unw_word_t fde) { |
| // fde is own mh_group |
| DwarfFDECache<LocalAddressSpace>::removeAllIn((LocalAddressSpace::pint_t)fde); |
| } |
| #endif // defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND) |
| #endif // !defined(__USING_SJLJ_EXCEPTIONS__) |
| |
| |
| |
| // Add logging hooks in Debug builds only |
| #ifndef NDEBUG |
| #include <stdlib.h> |
| |
| _LIBUNWIND_HIDDEN |
| bool logAPIs() { |
| // do manual lock to avoid use of _cxa_guard_acquire or initializers |
| static bool checked = false; |
| static bool log = false; |
| if (!checked) { |
| log = (getenv("LIBUNWIND_PRINT_APIS") != NULL); |
| checked = true; |
| } |
| return log; |
| } |
| |
| _LIBUNWIND_HIDDEN |
| bool logUnwinding() { |
| // do manual lock to avoid use of _cxa_guard_acquire or initializers |
| static bool checked = false; |
| static bool log = false; |
| if (!checked) { |
| log = (getenv("LIBUNWIND_PRINT_UNWINDING") != NULL); |
| checked = true; |
| } |
| return log; |
| } |
| |
| _LIBUNWIND_HIDDEN |
| bool logDWARF() { |
| // do manual lock to avoid use of _cxa_guard_acquire or initializers |
| static bool checked = false; |
| static bool log = false; |
| if (!checked) { |
| log = (getenv("LIBUNWIND_PRINT_DWARF") != NULL); |
| checked = true; |
| } |
| return log; |
| } |
| |
| #endif // NDEBUG |
| |