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Linux/arch/csky/include/asm/ptrace.h

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  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 
 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 static 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. */
 62 static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
 63 {
 64         return regs->usp;
 65 }
 66 
 67 static inline unsigned long frame_pointer(struct pt_regs *regs)
 68 {
 69         return regs->regs[4];
 70 }
 71 static inline void frame_pointer_set(struct pt_regs *regs,
 72                                      unsigned long val)
 73 {
 74         regs->regs[4] = val;
 75 }
 76 
 77 extern int regs_query_register_offset(const char *name);
 78 extern 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  */
 90 static 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 asmlinkage int syscall_trace_enter(struct pt_regs *regs);
100 asmlinkage void syscall_trace_exit(struct pt_regs *regs);
101 #endif /* __ASSEMBLY__ */
102 #endif /* __ASM_CSKY_PTRACE_H */
103 

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