| David Howells | a9df42e | 2010-12-03 15:59:50 +0000 | [diff] [blame] | 1 | /* Access to user system call parameters and results |
| 2 | * |
| 3 | * See asm-generic/syscall.h for function descriptions. |
| 4 | * |
| 5 | * Copyright (C) 2010 Red Hat, Inc. All Rights Reserved. |
| 6 | * Written by David Howells (dhowells@redhat.com) |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU General Public Licence |
| 10 | * as published by the Free Software Foundation; either version |
| 11 | * 2 of the Licence, or (at your option) any later version. |
| 12 | */ |
| 13 | |
| 14 | #ifndef _ASM_SYSCALL_H |
| 15 | #define _ASM_SYSCALL_H |
| 16 | |
| 17 | #include <linux/sched.h> |
| 18 | #include <linux/err.h> |
| 19 | |
| 20 | extern const unsigned long sys_call_table[]; |
| 21 | |
| 22 | static inline int syscall_get_nr(struct task_struct *task, struct pt_regs *regs) |
| 23 | { |
| 24 | return regs->orig_d0; |
| 25 | } |
| 26 | |
| 27 | static inline void syscall_rollback(struct task_struct *task, |
| 28 | struct pt_regs *regs) |
| 29 | { |
| 30 | regs->d0 = regs->orig_d0; |
| 31 | } |
| 32 | |
| 33 | static inline long syscall_get_error(struct task_struct *task, |
| 34 | struct pt_regs *regs) |
| 35 | { |
| 36 | unsigned long error = regs->d0; |
| 37 | return IS_ERR_VALUE(error) ? error : 0; |
| 38 | } |
| 39 | |
| 40 | static inline long syscall_get_return_value(struct task_struct *task, |
| 41 | struct pt_regs *regs) |
| 42 | { |
| 43 | return regs->d0; |
| 44 | } |
| 45 | |
| 46 | static inline void syscall_set_return_value(struct task_struct *task, |
| 47 | struct pt_regs *regs, |
| 48 | int error, long val) |
| 49 | { |
| 50 | regs->d0 = (long) error ?: val; |
| 51 | } |
| 52 | |
| 53 | static inline void syscall_get_arguments(struct task_struct *task, |
| 54 | struct pt_regs *regs, |
| 55 | unsigned int i, unsigned int n, |
| 56 | unsigned long *args) |
| 57 | { |
| 58 | switch (i) { |
| 59 | case 0: |
| 60 | if (!n--) break; |
| 61 | *args++ = regs->a0; |
| 62 | case 1: |
| 63 | if (!n--) break; |
| 64 | *args++ = regs->d1; |
| 65 | case 2: |
| 66 | if (!n--) break; |
| 67 | *args++ = regs->a3; |
| 68 | case 3: |
| 69 | if (!n--) break; |
| 70 | *args++ = regs->a2; |
| 71 | case 4: |
| 72 | if (!n--) break; |
| 73 | *args++ = regs->d3; |
| 74 | case 5: |
| 75 | if (!n--) break; |
| 76 | *args++ = regs->d2; |
| 77 | case 6: |
| 78 | if (!n--) break; |
| 79 | default: |
| 80 | BUG(); |
| 81 | break; |
| 82 | } |
| 83 | } |
| 84 | |
| 85 | static inline void syscall_set_arguments(struct task_struct *task, |
| 86 | struct pt_regs *regs, |
| 87 | unsigned int i, unsigned int n, |
| 88 | const unsigned long *args) |
| 89 | { |
| 90 | switch (i) { |
| 91 | case 0: |
| 92 | if (!n--) break; |
| 93 | regs->a0 = *args++; |
| 94 | case 1: |
| 95 | if (!n--) break; |
| 96 | regs->d1 = *args++; |
| 97 | case 2: |
| 98 | if (!n--) break; |
| 99 | regs->a3 = *args++; |
| 100 | case 3: |
| 101 | if (!n--) break; |
| 102 | regs->a2 = *args++; |
| 103 | case 4: |
| 104 | if (!n--) break; |
| 105 | regs->d3 = *args++; |
| 106 | case 5: |
| 107 | if (!n--) break; |
| 108 | regs->d2 = *args++; |
| 109 | case 6: |
| 110 | if (!n--) break; |
| 111 | default: |
| 112 | BUG(); |
| 113 | break; |
| 114 | } |
| 115 | } |
| 116 | |
| 117 | #endif /* _ASM_SYSCALL_H */ |