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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>
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Ley Foon Tan
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Dec 8, 2014
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/* | ||
* 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/>. | ||
*/ | ||
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#ifndef __ASM_NIOS2_SYSCALL_H__ | ||
#define __ASM_NIOS2_SYSCALL_H__ | ||
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#include <linux/err.h> | ||
#include <linux/sched.h> | ||
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static inline int syscall_get_nr(struct task_struct *task, struct pt_regs *regs) | ||
{ | ||
return regs->r2; | ||
} | ||
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static inline void syscall_rollback(struct task_struct *task, | ||
struct pt_regs *regs) | ||
{ | ||
regs->r2 = regs->orig_r2; | ||
regs->r7 = regs->orig_r7; | ||
} | ||
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static inline long syscall_get_error(struct task_struct *task, | ||
struct pt_regs *regs) | ||
{ | ||
return regs->r7 ? regs->r2 : 0; | ||
} | ||
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static inline long syscall_get_return_value(struct task_struct *task, | ||
struct pt_regs *regs) | ||
{ | ||
return regs->r2; | ||
} | ||
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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; | ||
} | ||
} | ||
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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); | ||
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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(); | ||
} | ||
} | ||
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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); | ||
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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(); | ||
} | ||
} | ||
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#endif |
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/* | ||
* Copyright Altera Corporation (C) 2013. 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_SYSCALLS_H | ||
#define __ASM_NIOS2_SYSCALLS_H | ||
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int sys_cacheflush(unsigned long addr, unsigned long len, | ||
unsigned int op); | ||
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#include <asm-generic/syscalls.h> | ||
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#endif /* __ASM_NIOS2_SYSCALLS_H */ |
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/* | ||
* Copyright (C) 2013 Altera Corporation | ||
* | ||
* 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/>. | ||
* | ||
*/ | ||
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#define sys_mmap2 sys_mmap_pgoff | ||
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/* Use the standard ABI for syscalls */ | ||
#include <asm-generic/unistd.h> | ||
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/* Additional Nios II specific syscalls. */ | ||
#define __NR_cacheflush (__NR_arch_specific_syscall) | ||
__SYSCALL(__NR_cacheflush, sys_cacheflush) |
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/* | ||
* Copyright (C) 2013 Altera Corporation | ||
* Copyright (C) 2011-2012 Tobias Klauser <tklauser@distanz.ch> | ||
* Copyright (C) 2004 Microtronix Datacom Ltd. | ||
* | ||
* This file is subject to the terms and conditions of the GNU General Public | ||
* License. See the file "COPYING" in the main directory of this archive | ||
* for more details. | ||
*/ | ||
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#include <linux/export.h> | ||
#include <linux/file.h> | ||
#include <linux/fs.h> | ||
#include <linux/slab.h> | ||
#include <linux/syscalls.h> | ||
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#include <asm/cacheflush.h> | ||
#include <asm/traps.h> | ||
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/* sys_cacheflush -- flush the processor cache. */ | ||
asmlinkage int sys_cacheflush(unsigned long addr, unsigned long len, | ||
unsigned int op) | ||
{ | ||
struct vm_area_struct *vma; | ||
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if (len == 0) | ||
return 0; | ||
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/* We only support op 0 now, return error if op is non-zero.*/ | ||
if (op) | ||
return -EINVAL; | ||
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/* Check for overflow */ | ||
if (addr + len < addr) | ||
return -EFAULT; | ||
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/* | ||
* Verify that the specified address region actually belongs | ||
* to this process. | ||
*/ | ||
vma = find_vma(current->mm, addr); | ||
if (vma == NULL || addr < vma->vm_start || addr + len > vma->vm_end) | ||
return -EFAULT; | ||
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flush_cache_range(vma, addr, addr + len); | ||
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return 0; | ||
} | ||
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asmlinkage int sys_getpagesize(void) | ||
{ | ||
return PAGE_SIZE; | ||
} |
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@@ -0,0 +1,29 @@ | ||
/* | ||
* Copyright Altera Corporation (C) 2013. 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/>. | ||
* | ||
*/ | ||
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#include <linux/syscalls.h> | ||
#include <linux/signal.h> | ||
#include <linux/unistd.h> | ||
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#include <asm/syscalls.h> | ||
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#undef __SYSCALL | ||
#define __SYSCALL(nr, call) [nr] = (call), | ||
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void *sys_call_table[__NR_syscalls] = { | ||
#include <asm/unistd.h> | ||
}; |