diff options
Diffstat (limited to 'libcxxabi/src/Unwind/AddressSpace.hpp')
| -rw-r--r-- | libcxxabi/src/Unwind/AddressSpace.hpp | 80 |
1 files changed, 74 insertions, 6 deletions
diff --git a/libcxxabi/src/Unwind/AddressSpace.hpp b/libcxxabi/src/Unwind/AddressSpace.hpp index 960c8f85bb4..f9e64ae5df4 100644 --- a/libcxxabi/src/Unwind/AddressSpace.hpp +++ b/libcxxabi/src/Unwind/AddressSpace.hpp @@ -56,6 +56,9 @@ extern EHTEntry __exidx_start; extern EHTEntry __exidx_end; #endif // !defined(_LIBUNWIND_IS_BAREMETAL) +#elif _LIBUNWIND_SUPPORT_DWARF_UNWIND +#include <link.h> +#include "EHHeaderParser.hpp" #endif // LIBCXXABI_ARM_EHABI namespace libunwind { @@ -132,7 +135,8 @@ public: static uint64_t getULEB128(pint_t &addr, pint_t end); static int64_t getSLEB128(pint_t &addr, pint_t end); - pint_t getEncodedP(pint_t &addr, pint_t end, uint8_t encoding); + pint_t getEncodedP(pint_t &addr, pint_t end, uint8_t encoding, + pint_t datarelBase = 0); bool findFunctionName(pint_t addr, char *buf, size_t bufLen, unw_word_t *offset); bool findUnwindSections(pint_t targetAddr, UnwindInfoSections &info); @@ -195,9 +199,9 @@ inline int64_t LocalAddressSpace::getSLEB128(pint_t &addr, pint_t end) { return result; } -inline LocalAddressSpace::pint_t LocalAddressSpace::getEncodedP(pint_t &addr, - pint_t end, - uint8_t encoding) { +inline LocalAddressSpace::pint_t +LocalAddressSpace::getEncodedP(pint_t &addr, pint_t end, uint8_t encoding, + pint_t datarelBase) { pint_t startAddr = addr; const uint8_t *p = (uint8_t *)addr; pint_t result; @@ -263,7 +267,12 @@ inline LocalAddressSpace::pint_t LocalAddressSpace::getEncodedP(pint_t &addr, _LIBUNWIND_ABORT("DW_EH_PE_textrel pointer encoding not supported"); break; case DW_EH_PE_datarel: - _LIBUNWIND_ABORT("DW_EH_PE_datarel pointer encoding not supported"); + // DW_EH_PE_datarel is only valid in a few places, so the parameter has a + // default value of 0, and we abort in the event that someone calls this + // function with a datarelBase of 0 and DW_EH_PE_datarel encoding. + if (datarelBase == 0) + _LIBUNWIND_ABORT("DW_EH_PE_datarel is invalid with a datarelBase of 0"); + result += datarelBase; break; case DW_EH_PE_funcrel: _LIBUNWIND_ABORT("DW_EH_PE_funcrel pointer encoding not supported"); @@ -353,6 +362,64 @@ inline bool LocalAddressSpace::findUnwindSections(pint_t targetAddr, info.arm_section, info.arm_section_length); if (info.arm_section && info.arm_section_length) return true; +#elif _LIBUNWIND_SUPPORT_DWARF_UNWIND +#if _LIBUNWIND_SUPPORT_DWARF_INDEX + struct dl_iterate_cb_data { + LocalAddressSpace *addressSpace; + UnwindInfoSections *sects; + uintptr_t targetAddr; + }; + + dl_iterate_cb_data cb_data = {this, &info, targetAddr}; + int found = dl_iterate_phdr( + [](struct dl_phdr_info *pinfo, size_t, void *data) -> int { + auto cbdata = static_cast<dl_iterate_cb_data *>(data); + size_t object_length; + bool found_obj = false; + bool found_hdr = false; + + assert(cbdata); + assert(cbdata->sects); + + if (cbdata->targetAddr < pinfo->dlpi_addr) { + return false; + } + + for (ElfW(Half) i = 0; i < pinfo->dlpi_phnum; i++) { + const ElfW(Phdr) *phdr = &pinfo->dlpi_phdr[i]; + if (phdr->p_type == PT_LOAD) { + uintptr_t begin = pinfo->dlpi_addr + phdr->p_vaddr; + uintptr_t end = begin + phdr->p_memsz; + if (cbdata->targetAddr >= begin && cbdata->targetAddr < end) { + cbdata->sects->dso_base = begin; + object_length = phdr->p_memsz; + found_obj = true; + } + } else if (phdr->p_type == PT_GNU_EH_FRAME) { + EHHeaderParser<LocalAddressSpace>::EHHeaderInfo hdrInfo; + uintptr_t eh_frame_hdr_start = pinfo->dlpi_addr + phdr->p_vaddr; + cbdata->sects->dwarf_index_section = eh_frame_hdr_start; + cbdata->sects->dwarf_index_section_length = phdr->p_memsz; + EHHeaderParser<LocalAddressSpace>::decodeEHHdr( + *cbdata->addressSpace, eh_frame_hdr_start, phdr->p_memsz, + hdrInfo); + cbdata->sects->dwarf_section = hdrInfo.eh_frame_ptr; + found_hdr = true; + } + } + + if (found_obj && found_hdr) { + cbdata->sects->dwarf_section_length = object_length; + return true; + } else { + return false; + } + }, + &cb_data); + return static_cast<bool>(found); +#else +#error "_LIBUNWIND_SUPPORT_DWARF_UNWIND requires _LIBUNWIND_SUPPORT_DWARF_INDEX on this platform." +#endif #endif return false; @@ -408,7 +475,8 @@ public: pint_t getP(pint_t addr); uint64_t getULEB128(pint_t &addr, pint_t end); int64_t getSLEB128(pint_t &addr, pint_t end); - pint_t getEncodedP(pint_t &addr, pint_t end, uint8_t encoding); + pint_t getEncodedP(pint_t &addr, pint_t end, uint8_t encoding, + pint_t datarelBase = 0); bool findFunctionName(pint_t addr, char *buf, size_t bufLen, unw_word_t *offset); bool findUnwindSections(pint_t targetAddr, UnwindInfoSections &info); |
