| #ifndef _ASM_STACKTRACE_H |
| #define _ASM_STACKTRACE_H |
| |
| #include <asm/ptrace.h> |
| |
| #ifdef CONFIG_KALLSYMS |
| extern int raw_show_trace; |
| extern unsigned long unwind_stack(struct task_struct *task, unsigned long *sp, |
| unsigned long pc, unsigned long *ra); |
| #else |
| #define raw_show_trace 1 |
| static inline unsigned long unwind_stack(struct task_struct *task, |
| unsigned long *sp, unsigned long pc, unsigned long *ra) |
| { |
| return 0; |
| } |
| #endif |
| |
| static __always_inline void prepare_frametrace(struct pt_regs *regs) |
| { |
| #ifndef CONFIG_KALLSYMS |
| /* |
| * Remove any garbage that may be in regs (specially func |
| * addresses) to avoid show_raw_backtrace() to report them |
| */ |
| memset(regs, 0, sizeof(*regs)); |
| #endif |
| __asm__ __volatile__( |
| ".set push\n\t" |
| ".set noat\n\t" |
| #ifdef CONFIG_64BIT |
| "1: dla $1, 1b\n\t" |
| "sd $1, %0\n\t" |
| "sd $29, %1\n\t" |
| "sd $31, %2\n\t" |
| #else |
| "1: la $1, 1b\n\t" |
| "sw $1, %0\n\t" |
| "sw $29, %1\n\t" |
| "sw $31, %2\n\t" |
| #endif |
| ".set pop\n\t" |
| : "=m" (regs->cp0_epc), |
| "=m" (regs->regs[29]), "=m" (regs->regs[31]) |
| : : "memory"); |
| } |
| |
| #endif /* _ASM_STACKTRACE_H */ |