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| author |   Peter Zijlstra <peterz@infradead.org> | 2019-03-01 11:15:49 +0100 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2019-04-03 11:02:24 +0200 |
| commit | 7697eee3ddd768a1fd78c1e687afaa6c5aa5072d (patch) | |
| tree | 2aa9fcbbf6b43a95793edcbc02dfbc5dd8bb9e3f /tools/objtool/builtin-check.c | |
| parent | objtool: Rewrite add_ignores() (diff) | |
| download | linux-dev-7697eee3ddd768a1fd78c1e687afaa6c5aa5072d.tar.xz linux-dev-7697eee3ddd768a1fd78c1e687afaa6c5aa5072d.zip | |
objtool: Add --backtrace support
For when you want to know the path that reached your fail state:
$ ./objtool check --no-fp --backtrace arch/x86/lib/usercopy_64.o
arch/x86/lib/usercopy_64.o: warning: objtool: .altinstr_replacement+0x3: UACCESS disable without MEMOPs: __clear_user()
arch/x86/lib/usercopy_64.o: warning: objtool: __clear_user()+0x3a: (alt)
arch/x86/lib/usercopy_64.o: warning: objtool: __clear_user()+0x2e: (branch)
arch/x86/lib/usercopy_64.o: warning: objtool: __clear_user()+0x18: (branch)
arch/x86/lib/usercopy_64.o: warning: objtool: .altinstr_replacement+0xffffffffffffffff: (branch)
arch/x86/lib/usercopy_64.o: warning: objtool: __clear_user()+0x5: (alt)
arch/x86/lib/usercopy_64.o: warning: objtool: __clear_user()+0x0: <=== (func)
0000000000000000 <__clear_user>:
0: e8 00 00 00 00 callq 5 <__clear_user+0x5>
1: R_X86_64_PLT32 __fentry__-0x4
5: 90 nop
6: 90 nop
7: 90 nop
8: 48 89 f0 mov %rsi,%rax
b: 48 c1 ee 03 shr $0x3,%rsi
f: 83 e0 07 and $0x7,%eax
12: 48 89 f1 mov %rsi,%rcx
15: 48 85 c9 test %rcx,%rcx
18: 74 0f je 29 <__clear_user+0x29>
1a: 48 c7 07 00 00 00 00 movq $0x0,(%rdi)
21: 48 83 c7 08 add $0x8,%rdi
25: ff c9 dec %ecx
27: 75 f1 jne 1a <__clear_user+0x1a>
29: 48 89 c1 mov %rax,%rcx
2c: 85 c9 test %ecx,%ecx
2e: 74 0a je 3a <__clear_user+0x3a>
30: c6 07 00 movb $0x0,(%rdi)
33: 48 ff c7 inc %rdi
36: ff c9 dec %ecx
38: 75 f6 jne 30 <__clear_user+0x30>
3a: 90 nop
3b: 90 nop
3c: 90 nop
3d: 48 89 c8 mov %rcx,%rax
40: c3 retq
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'tools/objtool/builtin-check.c')
| -rw-r--r-- | tools/objtool/builtin-check.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/tools/objtool/builtin-check.c b/tools/objtool/builtin-check.c index 694abc628e9b..99f10c585cbe 100644 --- a/tools/objtool/builtin-check.c +++ b/tools/objtool/builtin-check.c @@ -29,7 +29,7 @@ #include "builtin.h" #include "check.h" -bool no_fp, no_unreachable, retpoline, module; +bool no_fp, no_unreachable, retpoline, module, backtrace; static const char * const check_usage[] = { "objtool check [<options>] file.o", @@ -41,6 +41,7 @@ const struct option check_options[] = { OPT_BOOLEAN('u', "no-unreachable", &no_unreachable, "Skip 'unreachable instruction' warnings"), OPT_BOOLEAN('r', "retpoline", &retpoline, "Validate retpoline assumptions"), OPT_BOOLEAN('m', "module", &module, "Indicates the object will be part of a kernel module"), + OPT_BOOLEAN('b', "backtrace", &backtrace, "unwind on error"), OPT_END(), }; |