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
  28 static 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
  40 static inline bool in_syscall(struct pt_regs const *regs)
  41 {
  42         return ((regs->sr >> 16) & 0xff) == VEC_TRAP0;
  43 }
  44
  45 static inline void forget_syscall(struct pt_regs *regs)
  46 {
  47         regs->sr &= ~(0xff << 16);
  48 }
  49
  50 static inline unsigned long regs_return_value(struct pt_regs *regs)
  51 {
  52         return regs->a0;
  53 }
  54
  55 /* Valid only for Kernel mode traps. */
  56 static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
  57 {
  58         return regs->usp;
  59 }
  60
  61 extern int regs_query_register_offset(const char *name);
  62 extern unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
  63                                                 unsigned int n);
  64
  65 /*
  66  * regs_get_register() - get register value from its offset
  67  * @regs:      pt_regs from which register value is gotten
  68  * @offset:    offset of the register.
  69  *
  70  * regs_get_register returns the value of a register whose offset from @regs.
  71  * The @offset is the offset of the register in struct pt_regs.
  72  * If @offset is bigger than MAX_REG_OFFSET, this returns 0.
  73  */
  74 static inline unsigned long regs_get_register(struct pt_regs *regs,
  75                                                 unsigned int offset)
  76 {
  77         if (unlikely(offset > MAX_REG_OFFSET))
  78                 return 0;
  79
  80         return *(unsigned long *)((unsigned long)regs + offset);
  81 }
  82
  83 #endif /* __ASSEMBLY__ */
  84 #endif /* __ASM_CSKY_PTRACE_H */