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/*
* arch/score/kernel/syscall.c
*
* Score Processor version.
*
* Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
* Chen Liqin <liqin.chen@sunplusct.com>
* Lennox Wu <lennox.wu@sunplusct.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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 the file COPYING, or write
* to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <linux/file.h>
#include <linux/fs.h>
#include <linux/mman.h>
#include <linux/module.h>
#include <linux/unistd.h>
#include <linux/syscalls.h>
#include <asm/syscalls.h>
unsigned long shm_align_mask = PAGE_SIZE - 1;
EXPORT_SYMBOL(shm_align_mask);
asmlinkage unsigned long
sys_mmap2(unsigned long addr, unsigned long len, unsigned long prot,
unsigned long flags, unsigned long fd, unsigned long pgoff)
{
int error = -EBADF;
struct file *file = NULL;
if (pgoff & (~PAGE_MASK >> 12))
return -EINVAL;
flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
if (!(flags & MAP_ANONYMOUS)) {
file = fget(fd);
if (!file)
return error;
}
down_write(¤t->mm->mmap_sem);
error = do_mmap_pgoff(file, addr, len, prot, flags,
pgoff >> (PAGE_SHIFT - 12));
up_write(¤t->mm->mmap_sem);
if (file)
fput(file);
return error;
}
/*
* Clone a task - this clones the calling program thread.
* This is called indirectly via a small wrapper
*/
int score_clone(struct pt_regs *regs)
{
unsigned long clone_flags;
unsigned long newsp;
int __user *parent_tidptr, *child_tidptr;
clone_flags = regs->regs[4];
newsp = regs->regs[5];
if (!newsp)
newsp = regs->regs[0];
parent_tidptr = (int __user *)regs->regs[6];
child_tidptr = (int __user *)regs->regs[8];
return do_fork(clone_flags, newsp, regs, 0,
parent_tidptr, child_tidptr);
}
/*
* sys_execve() executes a new program.
* This is called indirectly via a small wrapper
*/
int score_execve(struct pt_regs *regs)
{
int error;
char *filename;
filename = getname((char *) (long) regs->regs[4]);
error = PTR_ERR(filename);
if (IS_ERR(filename))
return error;
error = do_execve(filename, (char **) (long) regs->regs[5],
(char **) (long) regs->regs[6], regs);
putname(filename);
return error;
}
/*
* If we ever come here the user sp is bad. Zap the process right away.
* Due to the bad stack signaling wouldn't work.
*/
void bad_stack(void)
{
do_exit(SIGSEGV);
}
/*
* Do a system call from kernel instead of calling sys_execve so we
* end up with proper pt_regs.
*/
int kernel_execve(const char *filename, char *const argv[], char *const envp[])
{
register unsigned long __r4 asm("r4") = (unsigned long) filename;
register unsigned long __r5 asm("r5") = (unsigned long) argv;
register unsigned long __r6 asm("r6") = (unsigned long) envp;
register unsigned long __r7 asm("r7");
__asm__ __volatile__ (" \n"
"ldi r27, %5 \n"
"syscall \n"
"mv %0, r4 \n"
"mv %1, r7 \n"
: "=&r" (__r4), "=r" (__r7)
: "r" (__r4), "r" (__r5), "r" (__r6), "i" (__NR_execve)
: "r8", "r9", "r10", "r11", "r22", "r23", "r24", "r25",
"r26", "r27", "memory");
if (__r7 == 0)
return __r4;
return -__r4;
}
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