LXR linux/arch/um/kernel/exec.c

   1/*
   2 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
   3 * Licensed under the GPL
   4 */
   5
   6#include "linux/stddef.h"
   7#include "linux/fs.h"
   8#include "linux/smp_lock.h"
   9#include "linux/ptrace.h"
  10#include "linux/sched.h"
  11#include "asm/current.h"
  12#include "asm/processor.h"
  13#include "asm/uaccess.h"
  14#include "as-layout.h"
  15#include "mem_user.h"
  16#include "skas.h"
  17#include "os.h"
  18#include "internal.h"
  19
  20void flush_thread(void)
  21{
  22        void *data = NULL;
  23        int ret;
  24
  25        arch_flush_thread(&current->thread.arch);
  26
  27        ret = unmap(&current->mm->context.id, 0, STUB_START, 0, &data);
  28        ret = ret || unmap(&current->mm->context.id, STUB_END,
  29                           host_task_size - STUB_END, 1, &data);
  30        if (ret) {
  31                printk(KERN_ERR "flush_thread - clearing address space failed, "
  32                       "err = %d\n", ret);
  33                force_sig(SIGKILL, current);
  34        }
  35
  36        __switch_mm(&current->mm->context.id);
  37}
  38
  39void start_thread(struct pt_regs *regs, unsigned long eip, unsigned long esp)
  40{
  41        set_fs(USER_DS);
  42        PT_REGS_IP(regs) = eip;
  43        PT_REGS_SP(regs) = esp;
  44}
  45
  46static long execve1(char *file, char __user * __user *argv,
  47                    char __user *__user *env)
  48{
  49        long error;
  50
  51        error = do_execve(file, argv, env, &current->thread.regs);
  52        if (error == 0) {
  53                task_lock(current);
  54                current->ptrace &= ~PT_DTRACE;
  55#ifdef SUBARCH_EXECVE1
  56                SUBARCH_EXECVE1(&current->thread.regs.regs);
  57#endif
  58                task_unlock(current);
  59        }
  60        return error;
  61}
  62
  63long um_execve(char *file, char __user *__user *argv, char __user *__user *env)
  64{
  65        long err;
  66
  67        err = execve1(file, argv, env);
  68        if (!err)
  69                UML_LONGJMP(current->thread.exec_buf, 1);
  70        return err;
  71}
  72
  73long sys_execve(char __user *file, char __user *__user *argv,
  74                char __user *__user *env)
  75{
  76        long error;
  77        char *filename;
  78
  79        lock_kernel();
  80        filename = getname(file);
  81        error = PTR_ERR(filename);
  82        if (IS_ERR(filename)) goto out;
  83        error = execve1(filename, argv, env);
  84        putname(filename);
  85 out:
  86        unlock_kernel();
  87        return error;
  88}
  89