1/*
  2 * arch/score/kernel/syscall.c
  3 *
  4 * Score Processor version.
  5 *
  6 * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
  7 *  Chen Liqin <liqin.chen@sunplusct.com>
  8 *  Lennox Wu <lennox.wu@sunplusct.com>
  9 *
 10 * This program is free software; you can redistribute it and/or modify
 11 * it under the terms of the GNU General Public License as published by
 12 * the Free Software Foundation; either version 2 of the License, or
 13 * (at your option) any later version.
 14 *
 15 * This program is distributed in the hope that it will be useful,
 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 18 * GNU General Public License for more details.
 19 *
 20 * You should have received a copy of the GNU General Public License
 21 * along with this program; if not, see the file COPYING, or write
 22 * to the Free Software Foundation, Inc.,
 23 * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 24 */
 25
 26#include <linux/file.h>
 27#include <linux/fs.h>
 28#include <linux/mm.h>
 29#include <linux/mman.h>
 30#include <linux/module.h>
 31#include <linux/slab.h>
 32#include <linux/unistd.h>
 33#include <linux/syscalls.h>
 34#include <asm/syscalls.h>
 35
 36asmlinkage long 
 37sys_mmap2(unsigned long addr, unsigned long len, unsigned long prot,
 38	  unsigned long flags, unsigned long fd, unsigned long pgoff)
 39{
 40	return sys_mmap_pgoff(addr, len, prot, flags, fd, pgoff);
 41}
 42
 43asmlinkage long
 44sys_mmap(unsigned long addr, unsigned long len, unsigned long prot,
 45	unsigned long flags, unsigned long fd, off_t offset)
 46{
 47	if (unlikely(offset & ~PAGE_MASK))
 48		return -EINVAL;
 49	return sys_mmap_pgoff(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
 50}
 51
 52asmlinkage long
 53score_fork(struct pt_regs *regs)
 54{
 55	return do_fork(SIGCHLD, regs->regs[0], regs, 0, NULL, NULL);
 56}
 57
 58/*
 59 * Clone a task - this clones the calling program thread.
 60 * This is called indirectly via a small wrapper
 61 */
 62asmlinkage long
 63score_clone(struct pt_regs *regs)
 64{
 65	unsigned long clone_flags;
 66	unsigned long newsp;
 67	int __user *parent_tidptr, *child_tidptr;
 68
 69	clone_flags = regs->regs[4];
 70	newsp = regs->regs[5];
 71	if (!newsp)
 72		newsp = regs->regs[0];
 73	parent_tidptr = (int __user *)regs->regs[6];
 74	child_tidptr = (int __user *)regs->regs[8];
 75
 76	return do_fork(clone_flags, newsp, regs, 0,
 77			parent_tidptr, child_tidptr);
 78}
 79
 80asmlinkage long
 81score_vfork(struct pt_regs *regs)
 82{
 83	return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD,
 84			regs->regs[0], regs, 0, NULL, NULL);
 85}
 86
 87/*
 88 * sys_execve() executes a new program.
 89 * This is called indirectly via a small wrapper
 90 */
 91asmlinkage long
 92score_execve(struct pt_regs *regs)
 93{
 94	int error;
 95	char *filename;
 96
 97	filename = getname((char __user*)regs->regs[4]);
 98	error = PTR_ERR(filename);
 99	if (IS_ERR(filename))
100		return error;
101
102	error = do_execve(filename,
103			  (const char __user *const __user *)regs->regs[5],
104			  (const char __user *const __user *)regs->regs[6],
105			  regs);
106
107	putname(filename);
108	return error;
109}
110
111/*
112 * Do a system call from kernel instead of calling sys_execve so we
113 * end up with proper pt_regs.
114 */
115int kernel_execve(const char *filename,
116		  const char *const argv[],
117		  const char *const envp[])
118{
119	register unsigned long __r4 asm("r4") = (unsigned long) filename;
120	register unsigned long __r5 asm("r5") = (unsigned long) argv;
121	register unsigned long __r6 asm("r6") = (unsigned long) envp;
122	register unsigned long __r7 asm("r7");
123
124	__asm__ __volatile__ ("	\n"
125		"ldi	r27, %5		\n"
126		"syscall		\n"
127		"mv	%0, r4		\n"
128		"mv	%1, r7		\n"
129		: "=&r" (__r4), "=r" (__r7)
130		: "r" (__r4), "r" (__r5), "r" (__r6), "i" (__NR_execve)
131		: "r8", "r9", "r10", "r11", "r22", "r23", "r24", "r25",
132		  "r26", "r27", "memory");
133
134	if (__r7 == 0)
135		return __r4;
136
137	return -__r4;
138}