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