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 | ||
| f5179287 | 16 | #include <linux/compiler.h> |
| bec9b2b2 RB |
17 | #include <linux/audit.h> |
| 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> | |
| 23 | ||
| 24 | static inline long syscall_get_nr(struct task_struct *task, | |
| 25 | struct pt_regs *regs) | |
| 26 | { | |
| 27 | return regs->regs[2]; | |
| 28 | } | |
| 29 | ||
| 30 | static inline unsigned long mips_get_syscall_arg(unsigned long *arg, | |
| 31 | struct task_struct *task, struct pt_regs *regs, unsigned int n) | |
| 32 | { | |
| 63238f2c | 33 | unsigned long usp __maybe_unused = regs->regs[29]; |
| c0ff3c53 RB |
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: | |
| 86ca57b5 | 43 | return get_user(*arg, (int *)usp + n); |
| c0ff3c53 RB |
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)) | |
| 86ca57b5 | 50 | return get_user(*arg, (int *)usp + n); |
| c0ff3c53 RB |
51 | else |
| 52 | #endif | |
| 53 | *arg = regs->regs[4 + n]; | |
| 54 | ||
| 55 | return 0; | |
| 56 | #endif | |
| 57 | ||
| 58 | default: | |
| 59 | BUG(); | |
| 60 | } | |
| f5179287 RB |
61 | |
| 62 | unreachable(); | |
| c0ff3c53 RB |
63 | } |
| 64 | ||
| 1d7bf993 RB |
65 | static inline long syscall_get_return_value(struct task_struct *task, |
| 66 | struct pt_regs *regs) | |
| 67 | { | |
| 68 | return regs->regs[2]; | |
| 69 | } | |
| 70 | ||
| 71 | static 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 | ||
| c0ff3c53 RB |
84 | static 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 | { | |
| c0ff3c53 RB |
89 | int ret; |
| 90 | ||
| 91 | while (n--) | |
| a8031d2c | 92 | ret |= mips_get_syscall_arg(args++, task, regs, i++); |
| c0ff3c53 RB |
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 | ||
| 19e2e172 RB |
102 | extern const unsigned long sys_call_table[]; |
| 103 | extern const unsigned long sys32_call_table[]; | |
| 104 | extern const unsigned long sysn32_call_table[]; | |
| 105 | ||
| bec9b2b2 RB |
106 | static 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 | ||
| 19e2e172 | 118 | #endif /* __ASM_MIPS_SYSCALL_H */ |