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authorAtsushi Nemoto <anemo@mba.ocn.ne.jp>2006-09-26 10:44:01 -0400
committerRalf Baechle <ralf@linux-mips.org>2006-10-01 18:16:57 -0400
commit1df0f0ff7e56f6dcb1351b9490d55ebf91ff4bd8 (patch)
treef309b9cf0293c973683b4fa3fab5bbb74e415d47 /include/asm-mips
parenteae6c0da9df81300895949897c0451423340ac40 (diff)
[MIPS] lockdep: Add STACKTRACE_SUPPORT and enable LOCKDEP_SUPPORT
Implement stacktrace interface by using unwind_stack() and enable lockdep support in Kconfig. Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'include/asm-mips')
-rw-r--r--include/asm-mips/stacktrace.h44
1 files changed, 44 insertions, 0 deletions
diff --git a/include/asm-mips/stacktrace.h b/include/asm-mips/stacktrace.h
new file mode 100644
index 000000000000..231f6f897a61
--- /dev/null
+++ b/include/asm-mips/stacktrace.h
@@ -0,0 +1,44 @@
1#ifndef _ASM_STACKTRACE_H
2#define _ASM_STACKTRACE_H
3
4#include <asm/ptrace.h>
5
6#ifdef CONFIG_KALLSYMS
7extern int raw_show_trace;
8extern unsigned long unwind_stack(struct task_struct *task, unsigned long *sp,
9 unsigned long pc, unsigned long ra);
10#else
11#define raw_show_trace 1
12#define unwind_stack(task, sp, pc, ra) 0
13#endif
14
15static __always_inline void prepare_frametrace(struct pt_regs *regs)
16{
17#ifndef CONFIG_KALLSYMS
18 /*
19 * Remove any garbage that may be in regs (specially func
20 * addresses) to avoid show_raw_backtrace() to report them
21 */
22 memset(regs, 0, sizeof(*regs));
23#endif
24 __asm__ __volatile__(
25 ".set push\n\t"
26 ".set noat\n\t"
27#ifdef CONFIG_64BIT
28 "1: dla $1, 1b\n\t"
29 "sd $1, %0\n\t"
30 "sd $29, %1\n\t"
31 "sd $31, %2\n\t"
32#else
33 "1: la $1, 1b\n\t"
34 "sw $1, %0\n\t"
35 "sw $29, %1\n\t"
36 "sw $31, %2\n\t"
37#endif
38 ".set pop\n\t"
39 : "=m" (regs->cp0_epc),
40 "=m" (regs->regs[29]), "=m" (regs->regs[31])
41 : : "memory");
42}
43
44#endif /* _ASM_STACKTRACE_H */