![Ley Foon Tan](/assets/img/avatar_default.png)
This patch adds support for system calls from userspaces. It uses the asm-generic/unistd.h definitions with architecture spcific syscall. The sys_call_table is just an array defined in a C file and it contains pointers to the syscall functions. Signed-off-by: Ley Foon Tan <lftan@altera.com>
139 lines
2.6 KiB
C
139 lines
2.6 KiB
C
/*
|
|
* Copyright Altera Corporation (C) <2014>. All rights reserved
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms and conditions of the GNU General Public License,
|
|
* version 2, as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope 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_NIOS2_SYSCALL_H__
|
|
#define __ASM_NIOS2_SYSCALL_H__
|
|
|
|
#include <linux/err.h>
|
|
#include <linux/sched.h>
|
|
|
|
static inline int syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
|
|
{
|
|
return regs->r2;
|
|
}
|
|
|
|
static inline void syscall_rollback(struct task_struct *task,
|
|
struct pt_regs *regs)
|
|
{
|
|
regs->r2 = regs->orig_r2;
|
|
regs->r7 = regs->orig_r7;
|
|
}
|
|
|
|
static inline long syscall_get_error(struct task_struct *task,
|
|
struct pt_regs *regs)
|
|
{
|
|
return regs->r7 ? regs->r2 : 0;
|
|
}
|
|
|
|
static inline long syscall_get_return_value(struct task_struct *task,
|
|
struct pt_regs *regs)
|
|
{
|
|
return regs->r2;
|
|
}
|
|
|
|
static inline void syscall_set_return_value(struct task_struct *task,
|
|
struct pt_regs *regs, int error, long val)
|
|
{
|
|
if (error) {
|
|
/* error < 0, but nios2 uses > 0 return value */
|
|
regs->r2 = -error;
|
|
regs->r7 = 1;
|
|
} else {
|
|
regs->r2 = val;
|
|
regs->r7 = 0;
|
|
}
|
|
}
|
|
|
|
static inline void syscall_get_arguments(struct task_struct *task,
|
|
struct pt_regs *regs, unsigned int i, unsigned int n,
|
|
unsigned long *args)
|
|
{
|
|
BUG_ON(i + n > 6);
|
|
|
|
switch (i) {
|
|
case 0:
|
|
if (!n--)
|
|
break;
|
|
*args++ = regs->r4;
|
|
case 1:
|
|
if (!n--)
|
|
break;
|
|
*args++ = regs->r5;
|
|
case 2:
|
|
if (!n--)
|
|
break;
|
|
*args++ = regs->r6;
|
|
case 3:
|
|
if (!n--)
|
|
break;
|
|
*args++ = regs->r7;
|
|
case 4:
|
|
if (!n--)
|
|
break;
|
|
*args++ = regs->r8;
|
|
case 5:
|
|
if (!n--)
|
|
break;
|
|
*args++ = regs->r9;
|
|
case 6:
|
|
if (!n--)
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
}
|
|
|
|
static inline void syscall_set_arguments(struct task_struct *task,
|
|
struct pt_regs *regs, unsigned int i, unsigned int n,
|
|
const unsigned long *args)
|
|
{
|
|
BUG_ON(i + n > 6);
|
|
|
|
switch (i) {
|
|
case 0:
|
|
if (!n--)
|
|
break;
|
|
regs->r4 = *args++;
|
|
case 1:
|
|
if (!n--)
|
|
break;
|
|
regs->r5 = *args++;
|
|
case 2:
|
|
if (!n--)
|
|
break;
|
|
regs->r6 = *args++;
|
|
case 3:
|
|
if (!n--)
|
|
break;
|
|
regs->r7 = *args++;
|
|
case 4:
|
|
if (!n--)
|
|
break;
|
|
regs->r8 = *args++;
|
|
case 5:
|
|
if (!n--)
|
|
break;
|
|
regs->r9 = *args++;
|
|
case 6:
|
|
if (!n)
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
}
|
|
|
|
#endif
|