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