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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
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
29static 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
41static inline bool in_syscall(struct pt_regs const *regs)
42{
43 return ((regs->sr >> 16) & 0xff) == VEC_TRAP0;
44}
45
46static inline void forget_syscall(struct pt_regs *regs)
47{
48 regs->sr &= ~(0xff << 16);
49}
50
51static inline unsigned long regs_return_value(struct pt_regs *regs)
52{
53 return regs->a0;
54}
55
56static 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. */
63static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
64{
65 return regs->usp;
66}
67
68static inline unsigned long frame_pointer(struct pt_regs *regs)
69{
70 return regs->regs[4];
71}
72static inline void frame_pointer_set(struct pt_regs *regs,
73 unsigned long val)
74{
75 regs->regs[4] = val;
76}
77
78extern int regs_query_register_offset(const char *name);
79extern 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 */
91static 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 */