projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blame
| Commit | Line | Data |
|---|---|---|
| f27bb139 MZ |
1 | /* |
| 2 | * Copyright (C) 2012 ARM Ltd. | |
| 3 | * | |
| 4 | * This program is free software; you can redistribute it and/or modify | |
| 5 | * it under the terms of the GNU General Public License version 2 as | |
| 6 | * published by the Free Software Foundation. | |
| 7 | * | |
| 8 | * This program is distributed in the hope that it will be useful, | |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 11 | * GNU General Public License for more details. | |
| 12 | * | |
| 13 | * You should have received a copy of the GNU General Public License | |
| 14 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
| 15 | */ | |
| 16 | #ifndef __ASM_SYSCALL_H | |
| 17 | #define __ASM_SYSCALL_H | |
| 18 | ||
| 19 | #include <linux/err.h> | |
| 20 | ||
| 21 | ||
| 22 | static inline int syscall_get_nr(struct task_struct *task, | |
| 23 | struct pt_regs *regs) | |
| 24 | { | |
| 25 | return regs->syscallno; | |
| 26 | } | |
| 27 | ||
| 28 | static inline void syscall_rollback(struct task_struct *task, | |
| 29 | struct pt_regs *regs) | |
| 30 | { | |
| 31 | regs->regs[0] = regs->orig_x0; | |
| 32 | } | |
| 33 | ||
| 34 | ||
| 35 | static inline long syscall_get_error(struct task_struct *task, | |
| 36 | struct pt_regs *regs) | |
| 37 | { | |
| 38 | unsigned long error = regs->regs[0]; | |
| 39 | return IS_ERR_VALUE(error) ? error : 0; | |
| 40 | } | |
| 41 | ||
| 42 | static inline long syscall_get_return_value(struct task_struct *task, | |
| 43 | struct pt_regs *regs) | |
| 44 | { | |
| 45 | return regs->regs[0]; | |
| 46 | } | |
| 47 | ||
| 48 | static inline void syscall_set_return_value(struct task_struct *task, | |
| 49 | struct pt_regs *regs, | |
| 50 | int error, long val) | |
| 51 | { | |
| 52 | regs->regs[0] = (long) error ? error : val; | |
| 53 | } | |
| 54 | ||
| 55 | #define SYSCALL_MAX_ARGS 6 | |
| 56 | ||
| 57 | static inline void syscall_get_arguments(struct task_struct *task, | |
| 58 | struct pt_regs *regs, | |
| 59 | unsigned int i, unsigned int n, | |
| 60 | unsigned long *args) | |
| 61 | { | |
| 62 | if (i + n > SYSCALL_MAX_ARGS) { | |
| 63 | unsigned long *args_bad = args + SYSCALL_MAX_ARGS - i; | |
| 64 | unsigned int n_bad = n + i - SYSCALL_MAX_ARGS; | |
| 65 | pr_warning("%s called with max args %d, handling only %d\n", | |
| 66 | __func__, i + n, SYSCALL_MAX_ARGS); | |
| 67 | memset(args_bad, 0, n_bad * sizeof(args[0])); | |
| 68 | } | |
| 69 | ||
| 70 | if (i == 0) { | |
| 71 | args[0] = regs->orig_x0; | |
| 72 | args++; | |
| 73 | i++; | |
| 74 | n--; | |
| 75 | } | |
| 76 | ||
| 77 | memcpy(args, ®s->regs[i], n * sizeof(args[0])); | |
| 78 | } | |
| 79 | ||
| 80 | static inline void syscall_set_arguments(struct task_struct *task, | |
| 81 | struct pt_regs *regs, | |
| 82 | unsigned int i, unsigned int n, | |
| 83 | const unsigned long *args) | |
| 84 | { | |
| 85 | if (i + n > SYSCALL_MAX_ARGS) { | |
| 86 | pr_warning("%s called with max args %d, handling only %d\n", | |
| 87 | __func__, i + n, SYSCALL_MAX_ARGS); | |
| 88 | n = SYSCALL_MAX_ARGS - i; | |
| 89 | } | |
| 90 | ||
| 91 | if (i == 0) { | |
| 92 | regs->orig_x0 = args[0]; | |
| 93 | args++; | |
| 94 | i++; | |
| 95 | n--; | |
| 96 | } | |
| 97 | ||
| 98 | memcpy(®s->regs[i], args, n * sizeof(args[0])); | |
| 99 | } | |
| 100 | ||
| 101 | #endif /* __ASM_SYSCALL_H */ |