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 #define trap_no(regs) ((regs->sr >> 16) & 0xff)
28
instruction_pointer_set(struct pt_regs * regs,unsigned long val)29 static inline void instruction_pointer_set(struct pt_regs *regs,
30 unsigned long val)
31 {
32 regs->pc = val;
33 }
34
35 #if defined(__CSKYABIV2__)
36 #define MAX_REG_OFFSET offsetof(struct pt_regs, dcsr)
37 #else
38 #define MAX_REG_OFFSET offsetof(struct pt_regs, regs[9])
39 #endif
40
in_syscall(struct pt_regs const * regs)41 static inline bool in_syscall(struct pt_regs const *regs)
42 {
43 return ((regs->sr >> 16) & 0xff) == VEC_TRAP0;
44 }
45
forget_syscall(struct pt_regs * regs)46 static inline void forget_syscall(struct pt_regs *regs)
47 {
48 regs->sr &= ~(0xff << 16);
49 }
50
regs_return_value(struct pt_regs * regs)51 static inline unsigned long regs_return_value(struct pt_regs *regs)
52 {
53 return regs->a0;
54 }
55
regs_set_return_value(struct pt_regs * regs,unsigned long val)56 static inline void regs_set_return_value(struct pt_regs *regs,
57 unsigned long val)
58 {
59 regs->a0 = val;
60 }
61
62 /* Valid only for Kernel mode traps. */
kernel_stack_pointer(struct pt_regs * regs)63 static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
64 {
65 return regs->usp;
66 }
67
frame_pointer(struct pt_regs * regs)68 static inline unsigned long frame_pointer(struct pt_regs *regs)
69 {
70 return regs->regs[4];
71 }
frame_pointer_set(struct pt_regs * regs,unsigned long val)72 static inline void frame_pointer_set(struct pt_regs *regs,
73 unsigned long val)
74 {
75 regs->regs[4] = val;
76 }
77
78 extern int regs_query_register_offset(const char *name);
79 extern unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
80 unsigned int n);
81
82 /*
83 * regs_get_register() - get register value from its offset
84 * @regs: pt_regs from which register value is gotten
85 * @offset: offset of the register.
86 *
87 * regs_get_register returns the value of a register whose offset from @regs.
88 * The @offset is the offset of the register in struct pt_regs.
89 * If @offset is bigger than MAX_REG_OFFSET, this returns 0.
90 */
regs_get_register(struct pt_regs * regs,unsigned int offset)91 static inline unsigned long regs_get_register(struct pt_regs *regs,
92 unsigned int offset)
93 {
94 if (unlikely(offset > MAX_REG_OFFSET))
95 return 0;
96
97 return *(unsigned long *)((unsigned long)regs + offset);
98 }
99
100 #endif /* __ASSEMBLY__ */
101 #endif /* __ASM_CSKY_PTRACE_H */
102