Messages in this thread | | | Date | Tue, 19 Apr 2022 14:41:25 -0700 | From | Josh Poimboeuf <> | Subject | Re: [PATCH v2] scripts: Create objdump-func helper script |
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On Tue, Apr 19, 2022 at 10:14:35PM +0200, Peter Zijlstra wrote: > On Tue, Apr 19, 2022 at 09:50:01PM +0200, Borislav Petkov wrote: > > On Tue, Apr 19, 2022 at 09:12:23AM -0700, Josh Poimboeuf wrote: > > > Add a simple script which disassembles a single function from an object > > > file. Comes in handy for objtool warnings and kernel stack traces. > > > > > > Originally-by: Peter Zijlstra <peterz@infradead.org> > > > Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> > > > --- > > > v2: > > > - require gawk > > > > > > scripts/objdump-func | 18 ++++++++++++++++++ > > > 1 file changed, 18 insertions(+) > > > create mode 100755 scripts/objdump-func > > > > Was that supposed to be user-friendly too? > > > > $ ./scripts/objdump-func -h > > ./scripts/objdump-func: line 16: $1: unbound variable > > > > :-)
You mean you don't want to read the script to reverse engineer the usage before running it???
> > It works tho: > > > > $ ./scripts/objdump-func vmlinux rewind_stack_and_make_dead > > 0000 ffffffff81001c00 <rewind_stack_and_make_dead>: > > 0000 ffffffff81001c00: 31 ed xor %ebp,%ebp > > 0000 ffffffff81001c02: 65 48 8b 04 25 d0 ec 01 00 mov %gs:0x1ecd0,%rax > > 0000 ffffffff81001c0b: 48 8d a0 58 ff ff ff lea -0xa8(%rax),%rsp > > 0000 ffffffff81001c12: e8 39 24 07 00 call ffffffff81074050 <make_task_dead> > > ^^^^ > > > > I guess those zeros at the beginning are supposed to mean something... > > Use the .o file and it'll work:
Should probably get fixed to work on vmlinux too...
-- Josh
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