LXR linux/arch/csky/include/asm/ptrace.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
   3
   4#ifndef __ASM_CSKY_PTRACE_H
   5#define __ASM_CSKY_PTRACE_H
   6
   7#include <uapi/asm/ptrace.h>
   8#include <asm/traps.h>
   9#include <linux/types.h>
  10#include <linux/compiler.h>
  11
  12#ifndef __ASSEMBLY__
  13
  14#define PS_S    0x80000000 /* Supervisor Mode */
  15
  16#define USR_BKPT        0x1464
  17
  18#define arch_has_single_step() (1)
  19#define current_pt_regs() \
  20({ (struct pt_regs *)((char *)current_thread_info() + THREAD_SIZE) - 1; })
  21
  22#define user_stack_pointer(regs) ((regs)->usp)
  23
  24#define user_mode(regs) (!((regs)->sr & PS_S))
  25#define instruction_pointer(regs) ((regs)->pc)
  26#define profile_pc(regs) instruction_pointer(regs)
  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
  55/* Valid only for Kernel mode traps. */
  56static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
  57{
  58        return regs->usp;
  59}
  60
  61static inline unsigned long frame_pointer(struct pt_regs *regs)
  62{
  63        return regs->regs[4];
  64}
  65static inline void frame_pointer_set(struct pt_regs *regs,
  66                                     unsigned long val)
  67{
  68        regs->regs[4] = val;
  69}
  70
  71extern int regs_query_register_offset(const char *name);
  72extern unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
  73                                                unsigned int n);
  74
  75/*
  76 * regs_get_register() - get register value from its offset
  77 * @regs:      pt_regs from which register value is gotten
  78 * @offset:    offset of the register.
  79 *
  80 * regs_get_register returns the value of a register whose offset from @regs.
  81 * The @offset is the offset of the register in struct pt_regs.
  82 * If @offset is bigger than MAX_REG_OFFSET, this returns 0.
  83 */
  84static inline unsigned long regs_get_register(struct pt_regs *regs,
  85                                                unsigned int offset)
  86{
  87        if (unlikely(offset > MAX_REG_OFFSET))
  88                return 0;
  89
  90        return *(unsigned long *)((unsigned long)regs + offset);
  91}
  92
  93#endif /* __ASSEMBLY__ */
  94#endif /* __ASM_CSKY_PTRACE_H */
  95