| Ley Foon Tan | 1000197 | 2014-11-06 15:19:57 +0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright Altera Corporation (C) <2014>. All rights reserved |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify it |
| 5 | * under the terms and conditions of the GNU General Public License, |
| 6 | * version 2, as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope it will be useful, but WITHOUT |
| 9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 11 | * more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License along with |
| 14 | * this program. If not, see <http://www.gnu.org/licenses/>. |
| 15 | */ |
| 16 | |
| 17 | #ifndef __ASM_NIOS2_SYSCALL_H__ |
| 18 | #define __ASM_NIOS2_SYSCALL_H__ |
| 19 | |
| 20 | #include <linux/err.h> |
| 21 | #include <linux/sched.h> |
| 22 | |
| 23 | static inline int syscall_get_nr(struct task_struct *task, struct pt_regs *regs) |
| 24 | { |
| 25 | return regs->r2; |
| 26 | } |
| 27 | |
| 28 | static inline void syscall_rollback(struct task_struct *task, |
| 29 | struct pt_regs *regs) |
| 30 | { |
| 31 | regs->r2 = regs->orig_r2; |
| 32 | regs->r7 = regs->orig_r7; |
| 33 | } |
| 34 | |
| 35 | static inline long syscall_get_error(struct task_struct *task, |
| 36 | struct pt_regs *regs) |
| 37 | { |
| 38 | return regs->r7 ? regs->r2 : 0; |
| 39 | } |
| 40 | |
| 41 | static inline long syscall_get_return_value(struct task_struct *task, |
| 42 | struct pt_regs *regs) |
| 43 | { |
| 44 | return regs->r2; |
| 45 | } |
| 46 | |
| 47 | static inline void syscall_set_return_value(struct task_struct *task, |
| 48 | struct pt_regs *regs, int error, long val) |
| 49 | { |
| 50 | if (error) { |
| 51 | /* error < 0, but nios2 uses > 0 return value */ |
| 52 | regs->r2 = -error; |
| 53 | regs->r7 = 1; |
| 54 | } else { |
| 55 | regs->r2 = val; |
| 56 | regs->r7 = 0; |
| 57 | } |
| 58 | } |
| 59 | |
| 60 | static inline void syscall_get_arguments(struct task_struct *task, |
| 61 | struct pt_regs *regs, unsigned int i, unsigned int n, |
| 62 | unsigned long *args) |
| 63 | { |
| 64 | BUG_ON(i + n > 6); |
| 65 | |
| 66 | switch (i) { |
| 67 | case 0: |
| 68 | if (!n--) |
| 69 | break; |
| 70 | *args++ = regs->r4; |
| 71 | case 1: |
| 72 | if (!n--) |
| 73 | break; |
| 74 | *args++ = regs->r5; |
| 75 | case 2: |
| 76 | if (!n--) |
| 77 | break; |
| 78 | *args++ = regs->r6; |
| 79 | case 3: |
| 80 | if (!n--) |
| 81 | break; |
| 82 | *args++ = regs->r7; |
| 83 | case 4: |
| 84 | if (!n--) |
| 85 | break; |
| 86 | *args++ = regs->r8; |
| 87 | case 5: |
| 88 | if (!n--) |
| 89 | break; |
| 90 | *args++ = regs->r9; |
| 91 | case 6: |
| 92 | if (!n--) |
| 93 | break; |
| 94 | default: |
| 95 | BUG(); |
| 96 | } |
| 97 | } |
| 98 | |
| 99 | static inline void syscall_set_arguments(struct task_struct *task, |
| 100 | struct pt_regs *regs, unsigned int i, unsigned int n, |
| 101 | const unsigned long *args) |
| 102 | { |
| 103 | BUG_ON(i + n > 6); |
| 104 | |
| 105 | switch (i) { |
| 106 | case 0: |
| 107 | if (!n--) |
| 108 | break; |
| 109 | regs->r4 = *args++; |
| 110 | case 1: |
| 111 | if (!n--) |
| 112 | break; |
| 113 | regs->r5 = *args++; |
| 114 | case 2: |
| 115 | if (!n--) |
| 116 | break; |
| 117 | regs->r6 = *args++; |
| 118 | case 3: |
| 119 | if (!n--) |
| 120 | break; |
| 121 | regs->r7 = *args++; |
| 122 | case 4: |
| 123 | if (!n--) |
| 124 | break; |
| 125 | regs->r8 = *args++; |
| 126 | case 5: |
| 127 | if (!n--) |
| 128 | break; |
| 129 | regs->r9 = *args++; |
| 130 | case 6: |
| 131 | if (!n) |
| 132 | break; |
| 133 | default: |
| 134 | BUG(); |
| 135 | } |
| 136 | } |
| 137 | |
| 138 | #endif |