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/*
* 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;
struct filename *fn;
fn = getname(filename);
error = PTR_ERR(fn);
if (IS_ERR(fn))
goto out;
error = do_execve(fn->name, 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(®s, 0, sizeof(struct pt_regs));
ret = do_execve(filename,
(const char __user *const __user *)argv,
(const char __user *const __user *)envp, ®s);
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" (®s),
"Ir" (sizeof(regs))
: "r0", "r1", "r2", "r3", "ip", "lr", "memory");
out:
return ret;
}
/* 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>
};
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