Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __ASM_SH_SYSCALL_32_H
3#define __ASM_SH_SYSCALL_32_H
4
5#include <uapi/linux/audit.h>
6#include <linux/kernel.h>
7#include <linux/sched.h>
8#include <linux/err.h>
9#include <asm/ptrace.h>
10
11/* The system call number is given by the user in R3 */
12static inline long syscall_get_nr(struct task_struct *task,
13 struct pt_regs *regs)
14{
15 return (regs->tra >= 0) ? regs->regs[3] : -1L;
16}
17
18static inline void syscall_set_nr(struct task_struct *task,
19 struct pt_regs *regs,
20 int nr)
21{
22 /*
23 * Unlike syscall_get_nr(), syscall_set_nr() can be called only when
24 * the target task is stopped for tracing on entering syscall, so
25 * there is no need to have the same check syscall_get_nr() has.
26 */
27 regs->regs[3] = nr;
28}
29
30static inline void syscall_rollback(struct task_struct *task,
31 struct pt_regs *regs)
32{
33 /*
34 * XXX: This needs some thought. On SH we don't
35 * save away the original r0 value anywhere.
36 */
37}
38
39static inline long syscall_get_error(struct task_struct *task,
40 struct pt_regs *regs)
41{
42 return IS_ERR_VALUE(regs->regs[0]) ? regs->regs[0] : 0;
43}
44
45static inline long syscall_get_return_value(struct task_struct *task,
46 struct pt_regs *regs)
47{
48 return regs->regs[0];
49}
50
51static inline void syscall_set_return_value(struct task_struct *task,
52 struct pt_regs *regs,
53 int error, long val)
54{
55 regs->regs[0] = (long) error ?: val;
56}
57
58static inline void syscall_get_arguments(struct task_struct *task,
59 struct pt_regs *regs,
60 unsigned long *args)
61{
62
63 /* Argument pattern is: R4, R5, R6, R7, R0, R1 */
64 args[5] = regs->regs[1];
65 args[4] = regs->regs[0];
66 args[3] = regs->regs[7];
67 args[2] = regs->regs[6];
68 args[1] = regs->regs[5];
69 args[0] = regs->regs[4];
70}
71
72static inline void syscall_set_arguments(struct task_struct *task,
73 struct pt_regs *regs,
74 const unsigned long *args)
75{
76 regs->regs[1] = args[5];
77 regs->regs[0] = args[4];
78 regs->regs[7] = args[3];
79 regs->regs[6] = args[2];
80 regs->regs[5] = args[1];
81 regs->regs[4] = args[0];
82}
83
84static inline int syscall_get_arch(struct task_struct *task)
85{
86 int arch = AUDIT_ARCH_SH;
87
88#ifdef CONFIG_CPU_LITTLE_ENDIAN
89 arch |= __AUDIT_ARCH_LE;
90#endif
91 return arch;
92}
93#endif /* __ASM_SH_SYSCALL_32_H */