mirror of
https://github.com/torvalds/linux
synced 2024-09-21 03:28:37 +00:00
7697eee3dd
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>
79 lines
1.9 KiB
C
79 lines
1.9 KiB
C
/*
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* Copyright (C) 2015 Josh Poimboeuf <jpoimboe@redhat.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _WARN_H
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#define _WARN_H
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include "elf.h"
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extern const char *objname;
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static inline char *offstr(struct section *sec, unsigned long offset)
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{
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struct symbol *func;
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char *name, *str;
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unsigned long name_off;
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func = find_containing_func(sec, offset);
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if (func) {
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name = func->name;
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name_off = offset - func->offset;
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} else {
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name = sec->name;
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name_off = offset;
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}
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str = malloc(strlen(name) + 20);
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if (func)
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sprintf(str, "%s()+0x%lx", name, name_off);
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else
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sprintf(str, "%s+0x%lx", name, name_off);
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return str;
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}
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#define WARN(format, ...) \
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fprintf(stderr, \
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"%s: warning: objtool: " format "\n", \
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objname, ##__VA_ARGS__)
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#define WARN_FUNC(format, sec, offset, ...) \
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({ \
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char *_str = offstr(sec, offset); \
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WARN("%s: " format, _str, ##__VA_ARGS__); \
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free(_str); \
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})
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#define BT_FUNC(format, insn, ...) \
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({ \
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struct instruction *_insn = (insn); \
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char *_str = offstr(_insn->sec, _insn->offset); \
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WARN(" %s: " format, _str, ##__VA_ARGS__); \
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free(_str); \
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})
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#define WARN_ELF(format, ...) \
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WARN(format ": %s", ##__VA_ARGS__, elf_errmsg(-1))
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#endif /* _WARN_H */
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