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