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

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  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 static inline unsigned long frame_pointer(struct pt_regs *regs)
 62 {
 63         return regs->regs[4];
 64 }
 65 static inline void frame_pointer_set(struct pt_regs *regs,
 66                                      unsigned long val)
 67 {
 68         regs->regs[4] = val;
 69 }
 70 
 71 extern int regs_query_register_offset(const char *name);
 72 extern 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  */
 84 static 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 

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