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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 <uapi/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#include <asm/unistd.h>
24
25#ifndef __NR_syscall /* Only defined if _MIPS_SIM == _MIPS_SIM_ABI32 */
26#define __NR_syscall 4000
27#endif
28
29static inline long syscall_get_nr(struct task_struct *task,
30 struct pt_regs *regs)
31{
32 return current_thread_info()->syscall;
33}
34
35static inline unsigned long mips_get_syscall_arg(unsigned long *arg,
36 struct task_struct *task, struct pt_regs *regs, unsigned int n)
37{
38 unsigned long usp __maybe_unused = regs->regs[29];
39
40 switch (n) {
41 case 0: case 1: case 2: case 3:
42 *arg = regs->regs[4 + n];
43
44 return 0;
45
46#ifdef CONFIG_32BIT
47 case 4: case 5: case 6: case 7:
48 return get_user(*arg, (int *)usp + n);
49#endif
50
51#ifdef CONFIG_64BIT
52 case 4: case 5: case 6: case 7:
53#ifdef CONFIG_MIPS32_O32
54 if (test_thread_flag(TIF_32BIT_REGS))
55 return get_user(*arg, (int *)usp + n);
56 else
57#endif
58 *arg = regs->regs[4 + n];
59
60 return 0;
61#endif
62
63 default:
64 BUG();
65 }
66
67 unreachable();
68}
69
70static inline long syscall_get_return_value(struct task_struct *task,
71 struct pt_regs *regs)
72{
73 return regs->regs[2];
74}
75
76static inline void syscall_rollback(struct task_struct *task,
77 struct pt_regs *regs)
78{
79 /* Do nothing */
80}
81
82static inline void syscall_set_return_value(struct task_struct *task,
83 struct pt_regs *regs,
84 int error, long val)
85{
86 if (error) {
87 regs->regs[2] = -error;
88 regs->regs[7] = -1;
89 } else {
90 regs->regs[2] = val;
91 regs->regs[7] = 0;
92 }
93}
94
95static inline void syscall_get_arguments(struct task_struct *task,
96 struct pt_regs *regs,
97 unsigned int i, unsigned int n,
98 unsigned long *args)
99{
100 int ret;
101 /* O32 ABI syscall() - Either 64-bit with O32 or 32-bit */
102 if ((config_enabled(CONFIG_32BIT) ||
103 test_tsk_thread_flag(task, TIF_32BIT_REGS)) &&
104 (regs->regs[2] == __NR_syscall))
105 i++;
106
107 while (n--)
108 ret |= mips_get_syscall_arg(args++, task, regs, i++);
109
110 /*
111 * No way to communicate an error because this is a void function.
112 */
113#if 0
114 return ret;
115#endif
116}
117
118extern const unsigned long sys_call_table[];
119extern const unsigned long sys32_call_table[];
120extern const unsigned long sysn32_call_table[];
121
122static inline int syscall_get_arch(void)
123{
124 int arch = AUDIT_ARCH_MIPS;
125#ifdef CONFIG_64BIT
126 if (!test_thread_flag(TIF_32BIT_REGS)) {
127 arch |= __AUDIT_ARCH_64BIT;
128 /* N32 sets only TIF_32BIT_ADDR */
129 if (test_thread_flag(TIF_32BIT_ADDR))
130 arch |= __AUDIT_ARCH_CONVENTION_MIPS64_N32;
131 }
132#endif
133#if defined(__LITTLE_ENDIAN)
134 arch |= __AUDIT_ARCH_LE;
135#endif
136 return arch;
137}
138
139#endif /* __ASM_MIPS_SYSCALL_H */
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 <uapi/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#include <asm/unistd.h>
24
25#ifndef __NR_syscall /* Only defined if _MIPS_SIM == _MIPS_SIM_ABI32 */
26#define __NR_syscall 4000
27#endif
28
29static inline bool mips_syscall_is_indirect(struct task_struct *task,
30 struct pt_regs *regs)
31{
32 /* O32 ABI syscall() - Either 64-bit with O32 or 32-bit */
33 return (IS_ENABLED(CONFIG_32BIT) ||
34 test_tsk_thread_flag(task, TIF_32BIT_REGS)) &&
35 (regs->regs[2] == __NR_syscall);
36}
37
38static inline long syscall_get_nr(struct task_struct *task,
39 struct pt_regs *regs)
40{
41 return current_thread_info()->syscall;
42}
43
44static inline void mips_syscall_update_nr(struct task_struct *task,
45 struct pt_regs *regs)
46{
47 /*
48 * v0 is the system call number, except for O32 ABI syscall(), where it
49 * ends up in a0.
50 */
51 if (mips_syscall_is_indirect(task, regs))
52 task_thread_info(task)->syscall = regs->regs[4];
53 else
54 task_thread_info(task)->syscall = regs->regs[2];
55}
56
57static inline void mips_get_syscall_arg(unsigned long *arg,
58 struct task_struct *task, struct pt_regs *regs, unsigned int n)
59{
60 unsigned long usp __maybe_unused = regs->regs[29];
61
62 switch (n) {
63 case 0: case 1: case 2: case 3:
64 *arg = regs->regs[4 + n];
65
66 return;
67
68#ifdef CONFIG_32BIT
69 case 4: case 5: case 6: case 7:
70 get_user(*arg, (int *)usp + n);
71 return;
72#endif
73
74#ifdef CONFIG_64BIT
75 case 4: case 5: case 6: case 7:
76#ifdef CONFIG_MIPS32_O32
77 if (test_tsk_thread_flag(task, TIF_32BIT_REGS))
78 get_user(*arg, (int *)usp + n);
79 else
80#endif
81 *arg = regs->regs[4 + n];
82
83 return;
84#endif
85
86 default:
87 BUG();
88 }
89
90 unreachable();
91}
92
93static inline long syscall_get_error(struct task_struct *task,
94 struct pt_regs *regs)
95{
96 return regs->regs[7] ? -regs->regs[2] : 0;
97}
98
99static inline long syscall_get_return_value(struct task_struct *task,
100 struct pt_regs *regs)
101{
102 return regs->regs[2];
103}
104
105static inline void syscall_rollback(struct task_struct *task,
106 struct pt_regs *regs)
107{
108 /* Do nothing */
109}
110
111static inline void syscall_set_return_value(struct task_struct *task,
112 struct pt_regs *regs,
113 int error, long val)
114{
115 if (error) {
116 regs->regs[2] = -error;
117 regs->regs[7] = 1;
118 } else {
119 regs->regs[2] = val;
120 regs->regs[7] = 0;
121 }
122}
123
124static inline void syscall_get_arguments(struct task_struct *task,
125 struct pt_regs *regs,
126 unsigned long *args)
127{
128 unsigned int i = 0;
129 unsigned int n = 6;
130
131 /* O32 ABI syscall() */
132 if (mips_syscall_is_indirect(task, regs))
133 i++;
134
135 while (n--)
136 mips_get_syscall_arg(args++, task, regs, i++);
137}
138
139extern const unsigned long sys_call_table[];
140extern const unsigned long sys32_call_table[];
141extern const unsigned long sysn32_call_table[];
142
143static inline int syscall_get_arch(struct task_struct *task)
144{
145 int arch = AUDIT_ARCH_MIPS;
146#ifdef CONFIG_64BIT
147 if (!test_tsk_thread_flag(task, TIF_32BIT_REGS)) {
148 arch |= __AUDIT_ARCH_64BIT;
149 /* N32 sets only TIF_32BIT_ADDR */
150 if (test_tsk_thread_flag(task, TIF_32BIT_ADDR))
151 arch |= __AUDIT_ARCH_CONVENTION_MIPS64_N32;
152 }
153#endif
154#if defined(__LITTLE_ENDIAN)
155 arch |= __AUDIT_ARCH_LE;
156#endif
157 return arch;
158}
159
160#endif /* __ASM_MIPS_SYSCALL_H */