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); 10extern unsigned long unwind_stack_by_address(unsigned long stack_page, 11 unsigned long *sp, 12 unsigned long pc, 13 unsigned long *ra); 14#else 15#define raw_show_trace 1 16static inline unsigned long unwind_stack(struct task_struct *task, 17 unsigned long *sp, unsigned long pc, unsigned long *ra) 18{ 19 return 0; 20} 21#endif 22 23static __always_inline void prepare_frametrace(struct pt_regs *regs) 24{ 25#ifndef CONFIG_KALLSYMS 26 /* 27 * Remove any garbage that may be in regs (specially func 28 * addresses) to avoid show_raw_backtrace() to report them 29 */ 30 memset(regs, 0, sizeof(*regs)); 31#endif 32 __asm__ __volatile__( 33 ".set push\n\t" 34 ".set noat\n\t" 35#ifdef CONFIG_64BIT 36 "1: dla $1, 1b\n\t" 37 "sd $1, %0\n\t" 38 "sd $29, %1\n\t" 39 "sd $31, %2\n\t" 40#else 41 "1: la $1, 1b\n\t" 42 "sw $1, %0\n\t" 43 "sw $29, %1\n\t" 44 "sw $31, %2\n\t" 45#endif 46 ".set pop\n\t" 47 : "=m" (regs->cp0_epc), 48 "=m" (regs->regs[29]), "=m" (regs->regs[31]) 49 : : "memory"); 50} 51 52#endif /* _ASM_STACKTRACE_H */ 53