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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