tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
nios2: System calls handling
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>
+270
+138
arch/nios2/include/asm/syscall.h
+138
arch/nios2/include/asm/syscall.h
···
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/*
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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
+25
arch/nios2/include/asm/syscalls.h
+25
arch/nios2/include/asm/syscalls.h
···
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/*
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* Copyright Altera Corporation (C) 2013. 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
10
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11
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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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*/
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#ifndef __ASM_NIOS2_SYSCALLS_H
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#define __ASM_NIOS2_SYSCALLS_H
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int sys_cacheflush(unsigned long addr, unsigned long len,
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unsigned int op);
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#include <asm-generic/syscalls.h>
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#endif /* __ASM_NIOS2_SYSCALLS_H */
+25
arch/nios2/include/uapi/asm/unistd.h
+25
arch/nios2/include/uapi/asm/unistd.h
···
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/*
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* Copyright (C) 2013 Altera Corporation
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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,
6
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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
9
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10
+
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11
+
* 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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*/
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#define sys_mmap2 sys_mmap_pgoff
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/* Use the standard ABI for syscalls */
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#include <asm-generic/unistd.h>
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/* Additional Nios II specific syscalls. */
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#define __NR_cacheflush (__NR_arch_specific_syscall)
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__SYSCALL(__NR_cacheflush, sys_cacheflush)
+53
arch/nios2/kernel/sys_nios2.c
+53
arch/nios2/kernel/sys_nios2.c
···
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/*
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* Copyright (C) 2013 Altera Corporation
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* Copyright (C) 2011-2012 Tobias Klauser <tklauser@distanz.ch>
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* Copyright (C) 2004 Microtronix Datacom Ltd.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/export.h>
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#include <linux/file.h>
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#include <linux/fs.h>
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#include <linux/slab.h>
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#include <linux/syscalls.h>
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#include <asm/cacheflush.h>
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#include <asm/traps.h>
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/* sys_cacheflush -- flush the processor cache. */
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asmlinkage int sys_cacheflush(unsigned long addr, unsigned long len,
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unsigned int op)
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{
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struct vm_area_struct *vma;
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if (len == 0)
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return 0;
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/* We only support op 0 now, return error if op is non-zero.*/
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if (op)
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return -EINVAL;
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/* Check for overflow */
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if (addr + len < addr)
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return -EFAULT;
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/*
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* Verify that the specified address region actually belongs
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* to this process.
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*/
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vma = find_vma(current->mm, addr);
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if (vma == NULL || addr < vma->vm_start || addr + len > vma->vm_end)
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return -EFAULT;
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flush_cache_range(vma, addr, addr + len);
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return 0;
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}
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asmlinkage int sys_getpagesize(void)
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{
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return PAGE_SIZE;
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}
+29
arch/nios2/kernel/syscall_table.c
+29
arch/nios2/kernel/syscall_table.c
···
1
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/*
2
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* Copyright Altera Corporation (C) 2013. All rights reserved
3
+
*
4
+
* This program is free software; you can redistribute it and/or modify it
5
+
* under the terms and conditions of the GNU General Public License,
6
+
* version 2, as published by the Free Software Foundation.
7
+
*
8
+
* This program is distributed in the hope it will be useful, but WITHOUT
9
+
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10
+
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11
+
* more details.
12
+
*
13
+
* You should have received a copy of the GNU General Public License along with
14
+
* this program. If not, see <http://www.gnu.org/licenses/>.
15
+
*
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+
*/
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#include <linux/syscalls.h>
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#include <linux/signal.h>
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#include <linux/unistd.h>
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#include <asm/syscalls.h>
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#undef __SYSCALL
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#define __SYSCALL(nr, call) [nr] = (call),
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void *sys_call_table[__NR_syscalls] = {
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#include <asm/unistd.h>
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};