/* *  linux/arch/arm/kernel/sys_arm.c * *  Copyright (C) People who wrote linux/arch/i386/kernel/sys_i386.c *  Copyright (C) 1995, 1996 Russell King. * * 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. * *  This file contains various random system calls that *  have a non-standard calling sequence on the Linux/arm *  platform. */#include <linux/export.h>#include <linux/errno.h>#include <linux/sched.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 <linux/slab.h> /* Fork a new task - this creates a new program thread. * This is called indirectly via a small wrapper */asmlinkage int sys_fork(struct pt_regs *regs){#ifdef CONFIG_MMU	return do_fork(SIGCHLD, regs->ARM_sp, regs, 0, NULL, NULL);#else	/* can not support in nommu mode */	return(-EINVAL);#endif} /* Clone a task - this clones the calling program thread. * This is called indirectly via a small wrapper */asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,			 int __user *parent_tidptr, int tls_val,			 int __user *child_tidptr, struct pt_regs *regs){	if (!newsp)		newsp = regs->ARM_sp; 	return do_fork(clone_flags, newsp, regs, 0, parent_tidptr, child_tidptr);} asmlinkage int sys_vfork(struct pt_regs *regs){	return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->ARM_sp, regs, 0, NULL, NULL);} /* sys_execve() executes a new program. * This is called indirectly via a small wrapper */asmlinkage int sys_execve(const char __user *filenamei,			  const char __user *const __user *argv,			  const char __user *const __user *envp, struct pt_regs *regs){	int error;	char * filename; 	filename = getname(filenamei);	error = PTR_ERR(filename);	if (IS_ERR(filename))		goto out;	error = do_execve(filename, argv, envp, regs);	putname(filename);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.ARM_r0 = 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"		"bl	memmove\n\t"	/* copy regs to top of stack */		"mov	r8, #0\n\t"	/* not a syscall */		"mov	r9, %0\n\t"	/* thread structure */		"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); /* * Since loff_t is a 64 bit type we avoid a lot of ABI hassle * with a different argument ordering. */asmlinkage long sys_arm_fadvise64_64(int fd, int advice,				     loff_t offset, loff_t len){	return sys_fadvise64_64(fd, offset, len, advice);}