https://github.com/GeorgeHuyubo updated
https://github.com/llvm/llvm-project/pull/120655
>From 72d214dc2e6d9754ae5525a9161924f140d92e3c Mon Sep 17 00:00:00 2001
From: George Hu <hy...@meta.com>
Date: Thu, 19 Dec 2024 15:38:12 -0800
Subject: [PATCH] [lldb] Fix address to read segment data
---
lldb/source/Plugins/Process/elf-core/ProcessElfCore.cpp | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/lldb/source/Plugins/Process/elf-core/ProcessElfCore.cpp
b/lldb/source/Plugins/Process/elf-core/ProcessElfCore.cpp
index b3916cc913f7db..1cf956c7163272 100644
--- a/lldb/source/Plugins/Process/elf-core/ProcessElfCore.cpp
+++ b/lldb/source/Plugins/Process/elf-core/ProcessElfCore.cpp
@@ -1031,6 +1031,7 @@ UUID ProcessElfCore::FindBuidIdInCoreMemory(lldb::addr_t
address) {
std::vector<uint8_t> ph_bytes;
ph_bytes.resize(elf_header.e_phentsize);
+ lldb::offset_t load_bias = 0;
for (unsigned int i = 0; i < elf_header.e_phnum; ++i) {
byte_read = ReadMemory(ph_addr + i * elf_header.e_phentsize,
ph_bytes.data(), elf_header.e_phentsize, error);
@@ -1041,6 +1042,10 @@ UUID ProcessElfCore::FindBuidIdInCoreMemory(lldb::addr_t
address) {
offset = 0;
elf::ELFProgramHeader program_header;
program_header.Parse(program_header_data, &offset);
+ // Find the load bias of the main executable.
+ if (program_header.p_type == llvm::ELF::PT_PHDR) {
+ load_bias = address;
+ }
if (program_header.p_type != llvm::ELF::PT_NOTE)
continue;
@@ -1049,7 +1054,7 @@ UUID ProcessElfCore::FindBuidIdInCoreMemory(lldb::addr_t
address) {
// We need to slide the address of the p_vaddr as these values don't get
// relocated in memory.
- const lldb::addr_t vaddr = program_header.p_vaddr + address;
+ const lldb::addr_t vaddr = program_header.p_vaddr + address - load_bias;
byte_read =
ReadMemory(vaddr, note_bytes.data(), program_header.p_memsz, error);
if (byte_read != program_header.p_memsz)
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