projects / deliverable / linux.git / blame
| 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 | ||
| bec9b2b2 RB |
16 | #include <linux/audit.h> |
| 17 | #include <linux/elf-em.h> | |
| c0ff3c53 RB |
18 | #include <linux/kernel.h> |
| 19 | #include <linux/sched.h> | |
| 20 | #include <linux/uaccess.h> | |
| 21 | #include <asm/ptrace.h> | |
| 22 | ||
| 23 | static inline long syscall_get_nr(struct task_struct *task, | |
| 24 | struct pt_regs *regs) | |
| 25 | { | |
| 26 | return regs->regs[2]; | |
| 27 | } | |
| 28 | ||
| 29 | static inline unsigned long mips_get_syscall_arg(unsigned long *arg, | |
| 30 | struct task_struct *task, struct pt_regs *regs, unsigned int n) | |
| 31 | { | |
| 63238f2c | 32 | unsigned long usp __maybe_unused = regs->regs[29]; |
| c0ff3c53 RB |
33 | |
| 34 | switch (n) { | |
| 35 | case 0: case 1: case 2: case 3: | |
| 36 | *arg = regs->regs[4 + n]; | |
| 37 | ||
| 38 | return 0; | |
| 39 | ||
| 40 | #ifdef CONFIG_32BIT | |
| 41 | case 4: case 5: case 6: case 7: | |
| 42 | return get_user(*arg, (int *)usp + 4 * n); | |
| 43 | #endif | |
| 44 | ||
| 45 | #ifdef CONFIG_64BIT | |
| 46 | case 4: case 5: case 6: case 7: | |
| 47 | #ifdef CONFIG_MIPS32_O32 | |
| 48 | if (test_thread_flag(TIF_32BIT_REGS)) | |
| 49 | return get_user(*arg, (int *)usp + 4 * n); | |
| 50 | else | |
| 51 | #endif | |
| 52 | *arg = regs->regs[4 + n]; | |
| 53 | ||
| 54 | return 0; | |
| 55 | #endif | |
| 56 | ||
| 57 | default: | |
| 58 | BUG(); | |
| 59 | } | |
| 60 | } | |
| 61 | ||
| 1d7bf993 RB |
62 | static inline long syscall_get_return_value(struct task_struct *task, |
| 63 | struct pt_regs *regs) | |
| 64 | { | |
| 65 | return regs->regs[2]; | |
| 66 | } | |
| 67 | ||
| 22feadbe MC |
68 | static inline void syscall_rollback(struct task_struct *task, |
| 69 | struct pt_regs *regs) | |
| 70 | { | |
| 71 | /* Do nothing */ | |
| 72 | } | |
| 73 | ||
| 1d7bf993 RB |
74 | static inline void syscall_set_return_value(struct task_struct *task, |
| 75 | struct pt_regs *regs, | |
| 76 | int error, long val) | |
| 77 | { | |
| 78 | if (error) { | |
| 79 | regs->regs[2] = -error; | |
| 80 | regs->regs[7] = -1; | |
| 81 | } else { | |
| 82 | regs->regs[2] = val; | |
| 83 | regs->regs[7] = 0; | |
| 84 | } | |
| 85 | } | |
| 86 | ||
| c0ff3c53 RB |
87 | static inline void syscall_get_arguments(struct task_struct *task, |
| 88 | struct pt_regs *regs, | |
| 89 | unsigned int i, unsigned int n, | |
| 90 | unsigned long *args) | |
| 91 | { | |
| 92 | unsigned long arg; | |
| 93 | int ret; | |
| 94 | ||
| 95 | while (n--) | |
| 96 | ret |= mips_get_syscall_arg(&arg, task, regs, i++); | |
| 97 | ||
| 98 | /* | |
| 99 | * No way to communicate an error because this is a void function. | |
| 100 | */ | |
| 101 | #if 0 | |
| 102 | return ret; | |
| 103 | #endif | |
| 104 | } | |
| 105 | ||
| 19e2e172 RB |
106 | extern const unsigned long sys_call_table[]; |
| 107 | extern const unsigned long sys32_call_table[]; | |
| 108 | extern const unsigned long sysn32_call_table[]; | |
| 109 | ||
| bec9b2b2 RB |
110 | static inline int __syscall_get_arch(void) |
| 111 | { | |
| 112 | int arch = EM_MIPS; | |
| 113 | #ifdef CONFIG_64BIT | |
| 114 | arch |= __AUDIT_ARCH_64BIT; | |
| 115 | #endif | |
| 116 | #if defined(__LITTLE_ENDIAN) | |
| 117 | arch |= __AUDIT_ARCH_LE; | |
| 118 | #endif | |
| 119 | return arch; | |
| 120 | } | |
| 121 | ||
| 19e2e172 | 122 | #endif /* __ASM_MIPS_SYSCALL_H */ |