================
@@ -983,6 +1001,66 @@ llvm::Error
ProcessElfCore::ParseThreadContextsFromNoteSegment(
}
}
+bool ProcessElfCore::IsElf(lldb::addr_t address) {
+ uint8_t buf[4];
+ Status error;
+ size_t byte_read = ReadMemory(address, buf, 4, error);
+ if (byte_read != 4)
+ return false;
+ return elf::ELFHeader::MagicBytesMatch(buf);
+}
+
+std::optional<UUID> ProcessElfCore::FindNoteInCoreMemory(lldb::addr_t address,
+ uint32_t type) {
+ if (!IsElf(address))
+ return std::nullopt;
+ const uint32_t addr_size = GetAddressByteSize();
+ const size_t elf_header_size = addr_size == 4 ? sizeof(llvm::ELF::Elf32_Ehdr)
+ :
sizeof(llvm::ELF::Elf64_Ehdr);
+
+ unsigned char buf[4096];
+ Status error;
+ size_t byte_read = ReadMemory(address, buf, elf_header_size, error);
+ if (byte_read != elf_header_size)
+ return std::nullopt;
+ DataExtractor data(buf, 4096, GetByteOrder(), addr_size);
+ lldb::offset_t offset = 0;
+
+ elf::ELFHeader elf_header;
+ elf_header.Parse(data, &offset);
+
+ const lldb::addr_t ph_addr = address + elf_header.e_phoff;
+
+ for (unsigned int i = 0; i < elf_header.e_phnum; ++i) {
+ byte_read = ReadMemory(ph_addr + i * elf_header.e_phentsize, buf,
+ elf_header.e_phentsize, error);
+ if (byte_read != elf_header.e_phentsize)
+ break;
+ offset = 0;
+ elf::ELFProgramHeader program_header;
+ program_header.Parse(data, &offset);
+ if (program_header.p_type != llvm::ELF::PT_NOTE)
+ continue;
+
+ byte_read =
+ ReadMemory(program_header.p_vaddr, buf, program_header.p_memsz, error);
+ if (byte_read != program_header.p_memsz)
+ continue;
+
+ auto notes_or_error = parseSegment(data, program_header.p_memsz);
----------------
clayborg wrote:
Create a DataBuffer for only the note data, and then we won't need to pass the
`program_header.p_memsz` to `parseSegment(...)`:
```
DataExtractor note_data(note_bytes.data(), note_bytes.size(), GetByteOrder(),
addr_size);
auto notes_or_error = parseSegment(note_data);
```
https://github.com/llvm/llvm-project/pull/92492
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