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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/*
2 * Access to user system call parameters and results
3 *
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file "COPYING" in the main directory of this archive
6 * for more details.
7 *
8 * See asm-generic/syscall.h for descriptions of what we must do here.
9 *
10 * Copyright (C) 2012 Ralf Baechle <ralf@linux-mips.org>
11 */
12
13#ifndef __ASM_MIPS_SYSCALL_H
14#define __ASM_MIPS_SYSCALL_H
15
16#include <linux/compiler.h>
17#include <linux/audit.h>
18#include <linux/elf-em.h>
19#include <linux/kernel.h>
20#include <linux/sched.h>
21#include <linux/uaccess.h>
22#include <asm/ptrace.h>
23
24static inline long syscall_get_nr(struct task_struct *task,
25 struct pt_regs *regs)
26{
27 return regs->regs[2];
28}
29
30static inline unsigned long mips_get_syscall_arg(unsigned long *arg,
31 struct task_struct *task, struct pt_regs *regs, unsigned int n)
32{
33 unsigned long usp __maybe_unused = regs->regs[29];
34
35 switch (n) {
36 case 0: case 1: case 2: case 3:
37 *arg = regs->regs[4 + n];
38
39 return 0;
40
41#ifdef CONFIG_32BIT
42 case 4: case 5: case 6: case 7:
43 return get_user(*arg, (int *)usp + n);
44#endif
45
46#ifdef CONFIG_64BIT
47 case 4: case 5: case 6: case 7:
48#ifdef CONFIG_MIPS32_O32
49 if (test_thread_flag(TIF_32BIT_REGS))
50 return get_user(*arg, (int *)usp + n);
51 else
52#endif
53 *arg = regs->regs[4 + n];
54
55 return 0;
56#endif
57
58 default:
59 BUG();
60 }
61
62 unreachable();
63}
64
65static inline long syscall_get_return_value(struct task_struct *task,
66 struct pt_regs *regs)
67{
68 return regs->regs[2];
69}
70
71static inline void syscall_set_return_value(struct task_struct *task,
72 struct pt_regs *regs,
73 int error, long val)
74{
75 if (error) {
76 regs->regs[2] = -error;
77 regs->regs[7] = -1;
78 } else {
79 regs->regs[2] = val;
80 regs->regs[7] = 0;
81 }
82}
83
84static inline void syscall_get_arguments(struct task_struct *task,
85 struct pt_regs *regs,
86 unsigned int i, unsigned int n,
87 unsigned long *args)
88{
89 int ret;
90
91 while (n--)
92 ret |= mips_get_syscall_arg(args++, task, regs, i++);
93
94 /*
95 * No way to communicate an error because this is a void function.
96 */
97#if 0
98 return ret;
99#endif
100}
101
102extern const unsigned long sys_call_table[];
103extern const unsigned long sys32_call_table[];
104extern const unsigned long sysn32_call_table[];
105
106static inline int __syscall_get_arch(void)
107{
108 int arch = EM_MIPS;
109#ifdef CONFIG_64BIT
110 arch |= __AUDIT_ARCH_64BIT;
111#endif
112#if defined(__LITTLE_ENDIAN)
113 arch |= __AUDIT_ARCH_LE;
114#endif
115 return arch;
116}
117
118#endif /* __ASM_MIPS_SYSCALL_H */