/* * linux/arch/unicore32/kernel/sys.c * * Code specific to PKUnity SoC and UniCore ISA * * Copyright (C) 2001-2010 GUAN Xue-tao * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */#include <linux/module.h>#include <linux/errno.h>#include <linux/sched.h>#include <linux/slab.h>#include <linux/mm.h>#include <linux/sem.h>#include <linux/msg.h>#include <linux/shm.h>#include <linux/stat.h>#include <linux/syscalls.h>#include <linux/mman.h>#include <linux/fs.h>#include <linux/file.h>#include <linux/ipc.h>#include <linux/uaccess.h> #include <asm/syscalls.h>#include <asm/cacheflush.h> /* Clone a task - this clones the calling program thread. * This is called indirectly via a small wrapper */asmlinkage long __sys_clone(unsigned long clone_flags, unsigned long newsp,			 void __user *parent_tid, void __user *child_tid,			 struct pt_regs *regs){	if (!newsp)		newsp = regs->UCreg_sp; 	return do_fork(clone_flags, newsp, regs, 0,			parent_tid, child_tid);} /* sys_execve() executes a new program. * This is called indirectly via a small wrapper */asmlinkage long __sys_execve(const char __user *filename,			  const char __user *const __user *argv,			  const char __user *const __user *envp,			  struct pt_regs *regs){	int error;	char *fn; 	fn = getname(filename);	error = PTR_ERR(fn);	if (IS_ERR(fn))		goto out;	error = do_execve(fn, argv, envp, regs);	putname(fn);out:	return error;} int kernel_execve(const char *filename,		  const char *const argv[],		  const char *const envp[]){	struct pt_regs regs;	int ret; 	memset(&regs, 0, sizeof(struct pt_regs));	ret = do_execve(filename,			(const char __user *const __user *)argv,			(const char __user *const __user *)envp, &regs);	if (ret < 0)		goto out; 	/*	 * Save argc to the register structure for userspace.	 */	regs.UCreg_00 = ret; 	/*	 * We were successful.  We won't be returning to our caller, but	 * instead to user space by manipulating the kernel stack.	 */	asm("add	r0, %0, %1\n\t"		"mov	r1, %2\n\t"		"mov	r2, %3\n\t"		"mov	r22, #0\n\t"	/* not a syscall */		"mov	r23, %0\n\t"	/* thread structure */		"b.l	memmove\n\t"	/* copy regs to top of stack */		"mov	sp, r0\n\t"	/* reposition stack pointer */		"b	ret_to_user"		:		: "r" (current_thread_info()),		  "Ir" (THREAD_START_SP - sizeof(regs)),		  "r" (&regs),		  "Ir" (sizeof(regs))		: "r0", "r1", "r2", "r3", "ip", "lr", "memory");  out:	return ret;}EXPORT_SYMBOL(kernel_execve); /* Note: used by the compat code even in 64-bit Linux. */SYSCALL_DEFINE6(mmap2, unsigned long, addr, unsigned long, len,		unsigned long, prot, unsigned long, flags,		unsigned long, fd, unsigned long, off_4k){	return sys_mmap_pgoff(addr, len, prot, flags, fd,			      off_4k);} /* Provide the actual syscall number to call mapping. */#undef __SYSCALL#define __SYSCALL(nr, call)	[nr] = (call), /* Note that we don't include <linux/unistd.h> but <asm/unistd.h> */void *sys_call_table[__NR_syscalls] = {	[0 ... __NR_syscalls-1] = sys_ni_syscall,#include <asm/unistd.h>};