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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_STACKTRACE_H
#define _ASM_STACKTRACE_H
#include <asm/ptrace.h>
#include <asm/asm.h>
#include <linux/stringify.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
#define STR_PTR_LA __stringify(PTR_LA)
#define STR_LONG_S __stringify(LONG_S)
#define STR_LONG_L __stringify(LONG_L)
#define STR_LONGSIZE __stringify(LONGSIZE)
#define STORE_ONE_REG(r) \
STR_LONG_S " $" __stringify(r)",("STR_LONGSIZE"*"__stringify(r)")(%1)\n\t"
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"
/* Store $1 so we can use it */
STR_LONG_S " $1,"STR_LONGSIZE"(%1)\n\t"
/* Store the PC */
"1: " STR_PTR_LA " $1, 1b\n\t"
STR_LONG_S " $1,%0\n\t"
STORE_ONE_REG(2)
STORE_ONE_REG(3)
STORE_ONE_REG(4)
STORE_ONE_REG(5)
STORE_ONE_REG(6)
STORE_ONE_REG(7)
STORE_ONE_REG(8)
STORE_ONE_REG(9)
STORE_ONE_REG(10)
STORE_ONE_REG(11)
STORE_ONE_REG(12)
STORE_ONE_REG(13)
STORE_ONE_REG(14)
STORE_ONE_REG(15)
STORE_ONE_REG(16)
STORE_ONE_REG(17)
STORE_ONE_REG(18)
STORE_ONE_REG(19)
STORE_ONE_REG(20)
STORE_ONE_REG(21)
STORE_ONE_REG(22)
STORE_ONE_REG(23)
STORE_ONE_REG(24)
STORE_ONE_REG(25)
STORE_ONE_REG(26)
STORE_ONE_REG(27)
STORE_ONE_REG(28)
STORE_ONE_REG(29)
STORE_ONE_REG(30)
STORE_ONE_REG(31)
/* Restore $1 */
STR_LONG_L " $1,"STR_LONGSIZE"(%1)\n\t"
".set pop\n\t"
: "=m" (regs->cp0_epc)
: "r" (regs->regs)
: "memory");
}
#endif /* _ASM_STACKTRACE_H */