Merge branch 'upstream' of git://ftp.linux-mips.org/pub/scm/upstream-linus
[linux-2.6] / include / asm-mips / stacktrace.h
1 #ifndef _ASM_STACKTRACE_H
2 #define _ASM_STACKTRACE_H
3
4 #include <asm/ptrace.h>
5
6 #ifdef CONFIG_KALLSYMS
7 extern int raw_show_trace;
8 extern 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
15 static __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 */