syscall_32.h

 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 */