123 lines
2.9 KiB
C
123 lines
2.9 KiB
C
|
/*
|
||
|
|
* Copyright (C) 2012 ARM Ltd.
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or modify
|
||
|
|
* it under the terms of the GNU General Public License version 2 as
|
||
|
|
* published by the Free Software Foundation.
|
||
|
|
*
|
||
|
|
* This program is distributed in the hope that it will be useful,
|
||
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
|
|
* GNU General Public License for more details.
|
||
|
|
*
|
||
|
|
* You should have received a copy of the GNU General Public License
|
||
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
||
|
|
*/
|
||
|
|
#ifndef __ASM_SYSCALL_H
|
||
|
|
#define __ASM_SYSCALL_H
|
||
|
|
|
||
|
|
#include <uapi/linux/audit.h>
|
||
|
|
#include <linux/compat.h>
|
||
|
|
#include <linux/err.h>
|
||
|
|
|
||
|
|
extern const void *sys_call_table[];
|
||
|
|
|
||
|
|
static inline int syscall_get_nr(struct task_struct *task,
|
||
|
|
struct pt_regs *regs)
|
||
|
|
{
|
||
|
|
return regs->syscallno;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline void syscall_rollback(struct task_struct *task,
|
||
|
|
struct pt_regs *regs)
|
||
|
|
{
|
||
|
|
regs->regs[0] = regs->orig_x0;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
static inline long syscall_get_error(struct task_struct *task,
|
||
|
|
struct pt_regs *regs)
|
||
|
|
{
|
||
|
|
unsigned long error = regs->regs[0];
|
||
|
|
return IS_ERR_VALUE(error) ? error : 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline long syscall_get_return_value(struct task_struct *task,
|
||
|
|
struct pt_regs *regs)
|
||
|
|
{
|
||
|
|
return regs->regs[0];
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline void syscall_set_return_value(struct task_struct *task,
|
||
|
|
struct pt_regs *regs,
|
||
|
|
int error, long val)
|
||
|
|
{
|
||
|
|
regs->regs[0] = (long) error ? error : val;
|
||
|
|
}
|
||
|
|
|
||
|
|
#define SYSCALL_MAX_ARGS 6
|
||
|
|
|
||
|
|
static inline void syscall_get_arguments(struct task_struct *task,
|
||
|
|
struct pt_regs *regs,
|
||
|
|
unsigned int i, unsigned int n,
|
||
|
|
unsigned long *args)
|
||
|
|
{
|
||
|
|
if (n == 0)
|
||
|
|
return;
|
||
|
|
|
||
|
|
if (i + n > SYSCALL_MAX_ARGS) {
|
||
|
|
unsigned long *args_bad = args + SYSCALL_MAX_ARGS - i;
|
||
|
|
unsigned int n_bad = n + i - SYSCALL_MAX_ARGS;
|
||
|
|
pr_warning("%s called with max args %d, handling only %d\n",
|
||
|
|
__func__, i + n, SYSCALL_MAX_ARGS);
|
||
|
|
memset(args_bad, 0, n_bad * sizeof(args[0]));
|
||
|
|
}
|
||
|
|
|
||
|
|
if (i == 0) {
|
||
|
|
args[0] = regs->orig_x0;
|
||
|
|
args++;
|
||
|
|
i++;
|
||
|
|
n--;
|
||
|
|
}
|
||
|
|
|
||
|
|
memcpy(args, ®s->regs[i], n * sizeof(args[0]));
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline void syscall_set_arguments(struct task_struct *task,
|
||
|
|
struct pt_regs *regs,
|
||
|
|
unsigned int i, unsigned int n,
|
||
|
|
const unsigned long *args)
|
||
|
|
{
|
||
|
|
if (n == 0)
|
||
|
|
return;
|
||
|
|
|
||
|
|
if (i + n > SYSCALL_MAX_ARGS) {
|
||
|
|
pr_warning("%s called with max args %d, handling only %d\n",
|
||
|
|
__func__, i + n, SYSCALL_MAX_ARGS);
|
||
|
|
n = SYSCALL_MAX_ARGS - i;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (i == 0) {
|
||
|
|
regs->orig_x0 = args[0];
|
||
|
|
args++;
|
||
|
|
i++;
|
||
|
|
n--;
|
||
|
|
}
|
||
|
|
|
||
|
|
memcpy(®s->regs[i], args, n * sizeof(args[0]));
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* We don't care about endianness (__AUDIT_ARCH_LE bit) here because
|
||
|
|
* AArch64 has the same system calls both on little- and big- endian.
|
||
|
|
*/
|
||
|
|
static inline int syscall_get_arch(void)
|
||
|
|
{
|
||
|
|
if (is_compat_task())
|
||
|
|
return AUDIT_ARCH_ARM;
|
||
|
|
|
||
|
|
return AUDIT_ARCH_AARCH64;
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif /* __ASM_SYSCALL_H */
|