2 * Copyright (C) 2012 ARM Ltd.
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.
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.
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/>.
16 #ifndef __ASM_SYSCALL_H
17 #define __ASM_SYSCALL_H
19 #include <linux/err.h>
21 extern const void *sys_call_table[];
23 static inline int syscall_get_nr(struct task_struct *task,
26 return regs->syscallno;
29 static inline void syscall_rollback(struct task_struct *task,
32 regs->regs[0] = regs->orig_x0;
36 static inline long syscall_get_error(struct task_struct *task,
39 unsigned long error = regs->regs[0];
40 return IS_ERR_VALUE(error) ? error : 0;
43 static inline long syscall_get_return_value(struct task_struct *task,
49 static inline void syscall_set_return_value(struct task_struct *task,
53 regs->regs[0] = (long) error ? error : val;
56 #define SYSCALL_MAX_ARGS 6
58 static inline void syscall_get_arguments(struct task_struct *task,
60 unsigned int i, unsigned int n,
66 if (i + n > SYSCALL_MAX_ARGS) {
67 unsigned long *args_bad = args + SYSCALL_MAX_ARGS - i;
68 unsigned int n_bad = n + i - SYSCALL_MAX_ARGS;
69 pr_warning("%s called with max args %d, handling only %d\n",
70 __func__, i + n, SYSCALL_MAX_ARGS);
71 memset(args_bad, 0, n_bad * sizeof(args[0]));
75 args[0] = regs->orig_x0;
81 memcpy(args, ®s->regs[i], n * sizeof(args[0]));
84 static inline void syscall_set_arguments(struct task_struct *task,
86 unsigned int i, unsigned int n,
87 const unsigned long *args)
92 if (i + n > SYSCALL_MAX_ARGS) {
93 pr_warning("%s called with max args %d, handling only %d\n",
94 __func__, i + n, SYSCALL_MAX_ARGS);
95 n = SYSCALL_MAX_ARGS - i;
99 regs->orig_x0 = args[0];
105 memcpy(®s->regs[i], args, n * sizeof(args[0]));
108 #endif /* __ASM_SYSCALL_H */