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#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);
extern unsigned long unwind_stack_by_address(unsigned long stack_page,
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 */