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/arch/sh/include/asm/syscall_32.h

http://github.com/mirrors/linux
C Header | 84 lines | 66 code | 11 blank | 7 comment | 1 complexity | 464658c99a9a6fc06fa5638db8d6b224 MD5 | raw file
 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_rollback(struct task_struct *task,
19				    struct pt_regs *regs)
20{
21	/*
22	 * XXX: This needs some thought. On SH we don't
23	 * save away the original r0 value anywhere.
24	 */
25}
26
27static inline long syscall_get_error(struct task_struct *task,
28				     struct pt_regs *regs)
29{
30	return IS_ERR_VALUE(regs->regs[0]) ? regs->regs[0] : 0;
31}
32
33static inline long syscall_get_return_value(struct task_struct *task,
34					    struct pt_regs *regs)
35{
36	return regs->regs[0];
37}
38
39static inline void syscall_set_return_value(struct task_struct *task,
40					    struct pt_regs *regs,
41					    int error, long val)
42{
43	if (error)
44		regs->regs[0] = -error;
45	else
46		regs->regs[0] = val;
47}
48
49static inline void syscall_get_arguments(struct task_struct *task,
50					 struct pt_regs *regs,
51					 unsigned long *args)
52{
53
54	/* Argument pattern is: R4, R5, R6, R7, R0, R1 */
55	args[5] = regs->regs[1];
56	args[4] = regs->regs[0];
57	args[3] = regs->regs[7];
58	args[2] = regs->regs[6];
59	args[1] = regs->regs[5];
60	args[0] = regs->regs[4];
61}
62
63static inline void syscall_set_arguments(struct task_struct *task,
64					 struct pt_regs *regs,
65					 const unsigned long *args)
66{
67	regs->regs[1] = args[5];
68	regs->regs[0] = args[4];
69	regs->regs[7] = args[3];
70	regs->regs[6] = args[2];
71	regs->regs[5] = args[1];
72	regs->regs[4] = args[0];
73}
74
75static inline int syscall_get_arch(struct task_struct *task)
76{
77	int arch = AUDIT_ARCH_SH;
78
79#ifdef CONFIG_CPU_LITTLE_ENDIAN
80	arch |= __AUDIT_ARCH_LE;
81#endif
82	return arch;
83}
84#endif /* __ASM_SH_SYSCALL_32_H */