1000197d80
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>
138 lines
2.6 KiB
C
138 lines
2.6 KiB
C
/*
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* Copyright Altera Corporation (C) <2014>. All rights reserved
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __ASM_NIOS2_SYSCALL_H__
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#define __ASM_NIOS2_SYSCALL_H__
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#include <linux/err.h>
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#include <linux/sched.h>
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static inline int syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
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{
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return regs->r2;
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}
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static inline void syscall_rollback(struct task_struct *task,
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struct pt_regs *regs)
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{
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regs->r2 = regs->orig_r2;
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regs->r7 = regs->orig_r7;
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}
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static inline long syscall_get_error(struct task_struct *task,
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struct pt_regs *regs)
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{
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return regs->r7 ? regs->r2 : 0;
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}
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static inline long syscall_get_return_value(struct task_struct *task,
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struct pt_regs *regs)
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{
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return regs->r2;
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}
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static inline void syscall_set_return_value(struct task_struct *task,
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struct pt_regs *regs, int error, long val)
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{
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if (error) {
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/* error < 0, but nios2 uses > 0 return value */
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regs->r2 = -error;
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regs->r7 = 1;
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} else {
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regs->r2 = val;
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regs->r7 = 0;
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}
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}
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static inline void syscall_get_arguments(struct task_struct *task,
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struct pt_regs *regs, unsigned int i, unsigned int n,
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unsigned long *args)
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{
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BUG_ON(i + n > 6);
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switch (i) {
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case 0:
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if (!n--)
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break;
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*args++ = regs->r4;
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case 1:
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if (!n--)
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break;
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*args++ = regs->r5;
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case 2:
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if (!n--)
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break;
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*args++ = regs->r6;
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case 3:
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if (!n--)
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break;
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*args++ = regs->r7;
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case 4:
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if (!n--)
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break;
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*args++ = regs->r8;
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case 5:
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if (!n--)
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break;
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*args++ = regs->r9;
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case 6:
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if (!n--)
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break;
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default:
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BUG();
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}
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}
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static inline void syscall_set_arguments(struct task_struct *task,
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struct pt_regs *regs, unsigned int i, unsigned int n,
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const unsigned long *args)
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{
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BUG_ON(i + n > 6);
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switch (i) {
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case 0:
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if (!n--)
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break;
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regs->r4 = *args++;
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case 1:
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if (!n--)
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break;
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regs->r5 = *args++;
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case 2:
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if (!n--)
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break;
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regs->r6 = *args++;
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case 3:
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if (!n--)
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break;
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regs->r7 = *args++;
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case 4:
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if (!n--)
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break;
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regs->r8 = *args++;
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case 5:
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if (!n--)
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break;
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regs->r9 = *args++;
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case 6:
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if (!n)
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break;
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default:
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BUG();
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}
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}
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#endif
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