The patch titled
Subject: scripts/gdb: fix lx-symbols command for arm64 LLVM
has been added to the -mm mm-nonmm-unstable branch. Its filename is
scripts-gdb-fix-lx-symbols-command-for-arm64-llvm.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/scripts-gdb-fix-lx-symbols-command-for-arm64-llvm.patch
This patch will later appear in the mm-nonmm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next via the mm-everything
branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days
------------------------------------------------------
From: Koudai Iwahori <koudai@xxxxxxxxxx>
Subject: scripts/gdb: fix lx-symbols command for arm64 LLVM
Date: Tue, 1 Aug 2023 05:10:52 -0700
lx-symbols assumes that module's .text sections is located at
`module->mem[MOD_TEXT].base` and passes it to add-symbol-file command.
However, .text section follows after .plt section in modules built by LLVM
toolchain for arm64 target. Symbol addresses are skewed in GDB.
Fix this issue by using the address of .text section stored in
`module->sect_attrs`.
Link: https://lkml.kernel.org/r/20230801121052.2475183-1-koudai@xxxxxxxxxx
Signed-off-by: Koudai Iwahori <koudai@xxxxxxxxxx>
Cc: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
Cc: Kieran Bingham <kbingham@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
scripts/gdb/linux/symbols.py | 17 ++++++++++-------
1 file changed, 10 insertions(+), 7 deletions(-)
--- a/scripts/gdb/linux/symbols.py~scripts-gdb-fix-lx-symbols-command-for-arm64-llvm
+++ a/scripts/gdb/linux/symbols.py
@@ -89,23 +89,27 @@ lx-symbols command."""
return name
return None
- def _section_arguments(self, module):
+ def _section_arguments(self, module, module_addr):
try:
sect_attrs = module['sect_attrs'].dereference()
except gdb.error:
- return ""
+ return str(module_addr)
+
attrs = sect_attrs['attrs']
section_name_to_address = {
attrs[n]['battr']['attr']['name'].string(): attrs[n]['address']
for n in range(int(sect_attrs['nsections']))}
+
+ textaddr = section_name_to_address.get(".text", module_addr)
args = []
for section_name in [".data", ".data..read_mostly", ".rodata", ".bss",
- ".text", ".text.hot", ".text.unlikely"]:
+ ".text.hot", ".text.unlikely"]:
address = section_name_to_address.get(section_name)
if address:
args.append(" -s {name} {addr}".format(
name=section_name, addr=str(address)))
- return "".join(args)
+ return "{textaddr} {sections}".format(
+ textaddr=textaddr, sections="".join(args))
def load_module_symbols(self, module):
module_name = module['name'].string()
@@ -125,10 +129,9 @@ lx-symbols command."""
module_addr = hex(int(module_addr, 0) + plt_offset + plt_size)
gdb.write("loading @{addr}: {filename}\n".format(
addr=module_addr, filename=module_file))
- cmdline = "add-symbol-file {filename} {addr}{sections}".format(
+ cmdline = "add-symbol-file {filename} {sections}".format(
filename=module_file,
- addr=module_addr,
- sections=self._section_arguments(module))
+ sections=self._section_arguments(module, module_addr))
gdb.execute(cmdline, to_string=True)
if module_name not in self.loaded_modules:
self.loaded_modules.append(module_name)
_
Patches currently in -mm which might be from koudai@xxxxxxxxxx are
scripts-gdb-fix-lx-symbols-command-for-arm64-llvm.patch
