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/* SPDX-License-Identifier: GPL-2.0 */
* Copyright (C) 1994, 95, 96, 97, 98, 99, 2000 by Ralf Baechle
* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
#ifndef _ASM_PTRACE_H
#define _ASM_PTRACE_H
#include <linux/compiler.h>
#include <linux/types.h>
#include <asm/isadep.h>
* This struct defines the way the registers are stored on the stack during a
* system call/exception. As usual the registers k0/k1 aren't being saved.
* If you add a register here, also add it to regoffset_table[] in
* arch/mips/kernel/ptrace.c.
struct pt_regs {
#ifdef CONFIG_32BIT
/* Pad bytes for argument save space on the stack. */
unsigned long pad0[8];
/* Saved main processor registers. */
unsigned long regs[32];
/* Saved special registers. */
unsigned long cp0_status;
unsigned long hi;
unsigned long lo;
unsigned long acx;
unsigned long cp0_badvaddr;
unsigned long cp0_cause;
unsigned long cp0_epc;
unsigned long long mpl[6]; /* MTM{0-5} */
unsigned long long mtp[6]; /* MTP{0-5} */
unsigned long __last[0];
} __aligned(8);
static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
return regs->regs[31];
* Don't use asm-generic/ptrace.h it defines FP accessors that don't make
* sense on MIPS. We rather want an error if they get invoked.
static inline void instruction_pointer_set(struct pt_regs *regs,
unsigned long val)
regs->cp0_epc = val;
/* Query offset/name of register from its name/offset */
extern int regs_query_register_offset(const char *name);
#define MAX_REG_OFFSET (offsetof(struct pt_regs, __last))
* regs_get_register() - get register value from its offset
* @regs: pt_regs from which register value is gotten.
* @offset: offset number of the register.
* regs_get_register returns the value of a register. The @offset is the
* offset of the register in struct pt_regs address which specified by @regs.
* If @offset is bigger than MAX_REG_OFFSET, this returns 0.
static inline unsigned long regs_get_register(struct pt_regs *regs,
unsigned int offset)
if (unlikely(offset > MAX_REG_OFFSET))
return 0;
return *(unsigned long *)((unsigned long)regs + offset);
* Does the process account for user or for system time?
#define user_mode(regs) (((regs)->cp0_status & KU_MASK) == KU_USER)
#define instruction_pointer(regs) ((regs)->cp0_epc)
#define profile_pc(regs) instruction_pointer(regs)
/* Helpers for working with the user stack pointer */
static inline unsigned long user_stack_pointer(struct pt_regs *regs)
return regs->regs[29];
static inline void user_stack_pointer_set(struct pt_regs *regs,
unsigned long val)
regs->regs[29] = val;
#endif /* _ASM_PTRACE_H */