1/* SPDX-License-Identifier: GPL-2.0 */
  2
  3#ifndef __ASM_CSKY_PTRACE_H
  4#define __ASM_CSKY_PTRACE_H
  5
  6#include <uapi/asm/ptrace.h>
  7#include <asm/traps.h>
  8#include <linux/types.h>
  9#include <linux/compiler.h>
 10
 11#ifndef __ASSEMBLY__
 12
 13#define PS_S	0x80000000 /* Supervisor Mode */
 14
 15#define USR_BKPT	0x1464
 16
 17#define arch_has_single_step() (1)
 18#define current_pt_regs() \
 19({ (struct pt_regs *)((char *)current_thread_info() + THREAD_SIZE) - 1; })
 20
 21#define user_stack_pointer(regs) ((regs)->usp)
 22
 23#define user_mode(regs) (!((regs)->sr & PS_S))
 24#define instruction_pointer(regs) ((regs)->pc)
 25#define profile_pc(regs) instruction_pointer(regs)
 26#define trap_no(regs) ((regs->sr >> 16) & 0xff)
 27
 28static inline void instruction_pointer_set(struct pt_regs *regs,
 29					   unsigned long val)
 30{
 31	regs->pc = val;
 32}
 33
 34#if defined(__CSKYABIV2__)
 35#define MAX_REG_OFFSET offsetof(struct pt_regs, dcsr)
 36#else
 37#define MAX_REG_OFFSET offsetof(struct pt_regs, regs[9])
 38#endif
 39
 40static inline bool in_syscall(struct pt_regs const *regs)
 41{
 42	return ((regs->sr >> 16) & 0xff) == VEC_TRAP0;
 43}
 44
 45static inline void forget_syscall(struct pt_regs *regs)
 46{
 47	regs->sr &= ~(0xff << 16);
 48}
 49
 50static inline unsigned long regs_return_value(struct pt_regs *regs)
 51{
 52	return regs->a0;
 53}
 54
 55static inline void regs_set_return_value(struct pt_regs *regs,
 56					 unsigned long val)
 57{
 58	regs->a0 = val;
 59}
 60
 61/* Valid only for Kernel mode traps. */
 62static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
 63{
 64	return regs->usp;
 65}
 66
 67static inline unsigned long frame_pointer(struct pt_regs *regs)
 68{
 69	return regs->regs[4];
 70}
 71static inline void frame_pointer_set(struct pt_regs *regs,
 72				     unsigned long val)
 73{
 74	regs->regs[4] = val;
 75}
 76
 77extern int regs_query_register_offset(const char *name);
 78extern unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
 79						unsigned int n);
 80
 81/*
 82 * regs_get_register() - get register value from its offset
 83 * @regs:      pt_regs from which register value is gotten
 84 * @offset:    offset of the register.
 85 *
 86 * regs_get_register returns the value of a register whose offset from @regs.
 87 * The @offset is the offset of the register in struct pt_regs.
 88 * If @offset is bigger than MAX_REG_OFFSET, this returns 0.
 89 */
 90static inline unsigned long regs_get_register(struct pt_regs *regs,
 91						unsigned int offset)
 92{
 93	if (unlikely(offset > MAX_REG_OFFSET))
 94		return 0;
 95
 96	return *(unsigned long *)((unsigned long)regs + offset);
 97}
 98
 99#endif /* __ASSEMBLY__ */
100#endif /* __ASM_CSKY_PTRACE_H */