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scripts/gdb: fix lx-symbols command for arm64 LLVM 

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@google.com
Signed-off-by: Koudai Iwahori <koudai@google.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Kieran Bingham <kbingham@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Koudai Iwahori 2023-08-01 05:10:52 -07:00 committed by Andrew Morton
parent 29665c1e2a
commit 1677bf7681
1 changed files with 10 additions and 7 deletions
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17
scripts/gdb/linux/symbols.py
View File

@ -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)