Commit | Line | Data |
---|---|---|
19e2e172 | 1 | /* |
c0ff3c53 RB |
2 | * Access to user system call parameters and results |
3 | * | |
19e2e172 RB |
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 | * | |
c0ff3c53 RB |
8 | * See asm-generic/syscall.h for descriptions of what we must do here. |
9 | * | |
19e2e172 RB |
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 | ||
f5179287 | 16 | #include <linux/compiler.h> |
579ec9e1 | 17 | #include <uapi/linux/audit.h> |
bec9b2b2 | 18 | #include <linux/elf-em.h> |
c0ff3c53 RB |
19 | #include <linux/kernel.h> |
20 | #include <linux/sched.h> | |
21 | #include <linux/uaccess.h> | |
22 | #include <asm/ptrace.h> | |
4c21b8fd MC |
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 | |
c0ff3c53 RB |
28 | |
29 | static inline long syscall_get_nr(struct task_struct *task, | |
30 | struct pt_regs *regs) | |
31 | { | |
4c21b8fd MC |
32 | /* O32 ABI syscall() - Either 64-bit with O32 or 32-bit */ |
33 | if ((config_enabled(CONFIG_32BIT) || | |
34 | test_tsk_thread_flag(task, TIF_32BIT_REGS)) && | |
35 | (regs->regs[2] == __NR_syscall)) | |
36 | return regs->regs[4]; | |
37 | else | |
38 | return regs->regs[2]; | |
c0ff3c53 RB |
39 | } |
40 | ||
41 | static inline unsigned long mips_get_syscall_arg(unsigned long *arg, | |
42 | struct task_struct *task, struct pt_regs *regs, unsigned int n) | |
43 | { | |
63238f2c | 44 | unsigned long usp __maybe_unused = regs->regs[29]; |
c0ff3c53 RB |
45 | |
46 | switch (n) { | |
47 | case 0: case 1: case 2: case 3: | |
48 | *arg = regs->regs[4 + n]; | |
49 | ||
50 | return 0; | |
51 | ||
52 | #ifdef CONFIG_32BIT | |
53 | case 4: case 5: case 6: case 7: | |
86ca57b5 | 54 | return get_user(*arg, (int *)usp + n); |
c0ff3c53 RB |
55 | #endif |
56 | ||
57 | #ifdef CONFIG_64BIT | |
58 | case 4: case 5: case 6: case 7: | |
59 | #ifdef CONFIG_MIPS32_O32 | |
60 | if (test_thread_flag(TIF_32BIT_REGS)) | |
86ca57b5 | 61 | return get_user(*arg, (int *)usp + n); |
c0ff3c53 RB |
62 | else |
63 | #endif | |
64 | *arg = regs->regs[4 + n]; | |
65 | ||
66 | return 0; | |
67 | #endif | |
68 | ||
69 | default: | |
70 | BUG(); | |
71 | } | |
f5179287 RB |
72 | |
73 | unreachable(); | |
c0ff3c53 RB |
74 | } |
75 | ||
1d7bf993 RB |
76 | static inline long syscall_get_return_value(struct task_struct *task, |
77 | struct pt_regs *regs) | |
78 | { | |
79 | return regs->regs[2]; | |
80 | } | |
81 | ||
22feadbe MC |
82 | static inline void syscall_rollback(struct task_struct *task, |
83 | struct pt_regs *regs) | |
84 | { | |
85 | /* Do nothing */ | |
86 | } | |
87 | ||
1d7bf993 RB |
88 | static inline void syscall_set_return_value(struct task_struct *task, |
89 | struct pt_regs *regs, | |
90 | int error, long val) | |
91 | { | |
92 | if (error) { | |
93 | regs->regs[2] = -error; | |
94 | regs->regs[7] = -1; | |
95 | } else { | |
96 | regs->regs[2] = val; | |
97 | regs->regs[7] = 0; | |
98 | } | |
99 | } | |
100 | ||
c0ff3c53 RB |
101 | static inline void syscall_get_arguments(struct task_struct *task, |
102 | struct pt_regs *regs, | |
103 | unsigned int i, unsigned int n, | |
104 | unsigned long *args) | |
105 | { | |
c0ff3c53 | 106 | int ret; |
4c21b8fd MC |
107 | /* O32 ABI syscall() - Either 64-bit with O32 or 32-bit */ |
108 | if ((config_enabled(CONFIG_32BIT) || | |
109 | test_tsk_thread_flag(task, TIF_32BIT_REGS)) && | |
110 | (regs->regs[2] == __NR_syscall)) { | |
111 | i++; | |
112 | n++; | |
113 | } | |
c0ff3c53 RB |
114 | |
115 | while (n--) | |
a8031d2c | 116 | ret |= mips_get_syscall_arg(args++, task, regs, i++); |
c0ff3c53 RB |
117 | |
118 | /* | |
119 | * No way to communicate an error because this is a void function. | |
120 | */ | |
121 | #if 0 | |
122 | return ret; | |
123 | #endif | |
124 | } | |
125 | ||
19e2e172 RB |
126 | extern const unsigned long sys_call_table[]; |
127 | extern const unsigned long sys32_call_table[]; | |
128 | extern const unsigned long sysn32_call_table[]; | |
129 | ||
5e937a9a | 130 | static inline int syscall_get_arch(void) |
bec9b2b2 | 131 | { |
ce5d1128 | 132 | int arch = AUDIT_ARCH_MIPS; |
bec9b2b2 | 133 | #ifdef CONFIG_64BIT |
40381529 | 134 | if (!test_thread_flag(TIF_32BIT_REGS)) { |
6e345746 | 135 | arch |= __AUDIT_ARCH_64BIT; |
40381529 MC |
136 | /* N32 sets only TIF_32BIT_ADDR */ |
137 | if (test_thread_flag(TIF_32BIT_ADDR)) | |
138 | arch |= __AUDIT_ARCH_CONVENTION_MIPS64_N32; | |
139 | } | |
bec9b2b2 RB |
140 | #endif |
141 | #if defined(__LITTLE_ENDIAN) | |
142 | arch |= __AUDIT_ARCH_LE; | |
143 | #endif | |
144 | return arch; | |
145 | } | |
146 | ||
19e2e172 | 147 | #endif /* __ASM_MIPS_SYSCALL_H */ |