diff options
| -rw-r--r-- | app/perfsymboltable.cpp | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/app/perfsymboltable.cpp b/app/perfsymboltable.cpp index 50e6fbc..6469ce5 100644 --- a/app/perfsymboltable.cpp +++ b/app/perfsymboltable.cpp @@ -559,6 +559,40 @@ PerfElfMap::ElfInfo PerfSymbolTable::findElf(quint64 ip) const return m_elfs.findElf(ip); } +static QByteArray fakeSymbolFromSection(Dwfl_Module *mod, Dwarf_Addr addr) +{ + Dwarf_Addr bias = 0; + auto elf = dwfl_module_getelf(mod, &bias); + const auto moduleAddr = addr - bias; + auto section = dwfl_module_address_section(mod, &addr, &bias); + if (!elf || !section) + return {}; + + size_t textSectionIndex = 0; + if (elf_getshdrstrndx(elf, &textSectionIndex) != 0) + return {}; + + size_t offset = 0; + if (auto shdr = elf64_getshdr(section)) { + offset = shdr->sh_name; + } else if (auto shdr = elf32_getshdr(section)) { + offset = shdr->sh_name; + } + + auto str = elf_strptr(elf, textSectionIndex, offset); + if (!str || str == QLatin1String(".text")) + return {}; + + // mark .plt entries etc. by section name, see also: + // http://www.mail-archive.com/elfutils-devel@sourceware.org/msg00019.html + QByteArray sym = str; + sym.prepend('<'); + sym.append('+'); + sym.append(QByteArray::number(quint64(moduleAddr), 16)); + sym.append('>'); + return sym; +} + int PerfSymbolTable::lookupFrame(Dwarf_Addr ip, bool isKernel, bool *isInterworking) { @@ -626,6 +660,7 @@ int PerfSymbolTable::lookupFrame(Dwarf_Addr ip, bool isKernel, } if (off == addressLocation.address) {// no symbol found + symname = fakeSymbolFromSection(mod, addressLocation.address); functionLocation.address = elfStart; // use the start of the elf as "function" addressLocation.parentLocationId = m_unwind->resolveLocation(functionLocation); } else { |