[linux-2.6-block.git] / arch / mips / include / asm / stacktrace.h

/* 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 */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
1df0f0ff AN	2	#ifndef _ASM_STACKTRACE_H
	3	#define _ASM_STACKTRACE_H
	4
	5	#include <asm/ptrace.h>
5b6b0847 CM	6	#include <asm/asm.h>
5b6b0847 CM	7	#include <linux/stringify.h>
1df0f0ff AN	8
	9	#ifdef CONFIG_KALLSYMS
	10	extern int raw_show_trace;
	11	extern unsigned long unwind_stack(struct task_struct task, unsigned long sp,
1924600c	12	unsigned long pc, unsigned long *ra);
94ea09c6 DK	13	extern unsigned long unwind_stack_by_address(unsigned long stack_page,
	14	unsigned long *sp,
	15	unsigned long pc,
	16	unsigned long *ra);
1df0f0ff AN	17	#else
1df0f0ff AN	18	#define raw_show_trace 1
de4b2147 RB	19	static inline unsigned long unwind_stack(struct task_struct *task,
	20	unsigned long sp, unsigned long pc, unsigned long ra)
	21	{
a204458a	22	return 0;
de4b2147	23	}
1df0f0ff AN	24	#endif
1df0f0ff AN	25
5b6b0847 CM	26	#define STR_PTR_LA __stringify(PTR_LA)
	27	#define STR_LONG_S __stringify(LONG_S)
	28	#define STR_LONG_L __stringify(LONG_L)
	29	#define STR_LONGSIZE __stringify(LONGSIZE)
	30
	31	#define STORE_ONE_REG(r) \
	32	STR_LONG_S " $" __stringify(r)",("STR_LONGSIZE"*"__stringify(r)")(%1)\n\t"
	33
1df0f0ff AN	34	static __always_inline void prepare_frametrace(struct pt_regs *regs)
	35	{
	36	#ifndef CONFIG_KALLSYMS
	37	/*
	38	* Remove any garbage that may be in regs (specially func
	39	* addresses) to avoid show_raw_backtrace() to report them
	40	*/
	41	memset(regs, 0, sizeof(*regs));
	42	#endif
	43	__asm__ __volatile__(
	44	".set push\n\t"
	45	".set noat\n\t"
5b6b0847 CM	46	/* Store $1 so we can use it */
	47	STR_LONG_S " $1,"STR_LONGSIZE"(%1)\n\t"
	48	/* Store the PC */
	49	"1: " STR_PTR_LA " $1, 1b\n\t"
	50	STR_LONG_S " $1,%0\n\t"
	51	STORE_ONE_REG(2)
	52	STORE_ONE_REG(3)
	53	STORE_ONE_REG(4)
	54	STORE_ONE_REG(5)
	55	STORE_ONE_REG(6)
	56	STORE_ONE_REG(7)
	57	STORE_ONE_REG(8)
	58	STORE_ONE_REG(9)
	59	STORE_ONE_REG(10)
	60	STORE_ONE_REG(11)
	61	STORE_ONE_REG(12)
	62	STORE_ONE_REG(13)
	63	STORE_ONE_REG(14)
	64	STORE_ONE_REG(15)
	65	STORE_ONE_REG(16)
	66	STORE_ONE_REG(17)
	67	STORE_ONE_REG(18)
	68	STORE_ONE_REG(19)
	69	STORE_ONE_REG(20)
	70	STORE_ONE_REG(21)
	71	STORE_ONE_REG(22)
	72	STORE_ONE_REG(23)
	73	STORE_ONE_REG(24)
	74	STORE_ONE_REG(25)
	75	STORE_ONE_REG(26)
	76	STORE_ONE_REG(27)
	77	STORE_ONE_REG(28)
	78	STORE_ONE_REG(29)
	79	STORE_ONE_REG(30)
	80	STORE_ONE_REG(31)
	81	/* Restore $1 */
	82	STR_LONG_L " $1,"STR_LONGSIZE"(%1)\n\t"
1df0f0ff	83	".set pop\n\t"
5b6b0847 CM	84	: "=m" (regs->cp0_epc)
	85	: "r" (regs->regs)
	86	: "memory");
1df0f0ff AN	87	}
	88
	89	#endif /* _ASM_STACKTRACE_H */