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exec.c

/*
 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
 * Licensed under the GPL
 */

#include "linux/stddef.h"
#include "linux/fs.h"
#include "linux/smp_lock.h"
#include "linux/ptrace.h"
#include "linux/sched.h"
#include "asm/current.h"
#include "asm/processor.h"
#include "asm/uaccess.h"
#include "as-layout.h"
#include "mem_user.h"
#include "skas.h"
#include "os.h"

void flush_thread(void)
{
      void *data = NULL;
      unsigned long end = proc_mm ? task_size : STUB_START;
      int ret;

      arch_flush_thread(&current->thread.arch);

      ret = unmap(&current->mm->context.id, 0, end, 1, &data);
      if (ret) {
            printk(KERN_ERR "flush_thread - clearing address space failed, "
                   "err = %d\n", ret);
            force_sig(SIGKILL, current);
      }

      __switch_mm(&current->mm->context.id);
}

void start_thread(struct pt_regs *regs, unsigned long eip, unsigned long esp)
{
      set_fs(USER_DS);
      PT_REGS_IP(regs) = eip;
      PT_REGS_SP(regs) = esp;
}

#ifdef CONFIG_TTY_LOG
extern void log_exec(char **argv, void *tty);
#endif

static long execve1(char *file, char __user * __user *argv,
                char __user *__user *env)
{
      long error;
#ifdef CONFIG_TTY_LOG
      struct tty_struct *tty;

      mutex_lock(&tty_mutex);
      tty = get_current_tty();
      if (tty)
            log_exec(argv, tty);
      mutex_unlock(&tty_mutex);
#endif
      error = do_execve(file, argv, env, &current->thread.regs);
      if (error == 0) {
            task_lock(current);
            current->ptrace &= ~PT_DTRACE;
#ifdef SUBARCH_EXECVE1
            SUBARCH_EXECVE1(&current->thread.regs.regs);
#endif
            task_unlock(current);
      }
      return error;
}

long um_execve(char *file, char __user *__user *argv, char __user *__user *env)
{
      long err;

      err = execve1(file, argv, env);
      if (!err)
            UML_LONGJMP(current->thread.exec_buf, 1);
      return err;
}

long sys_execve(char __user *file, char __user *__user *argv,
            char __user *__user *env)
{
      long error;
      char *filename;

      lock_kernel();
      filename = getname(file);
      error = PTR_ERR(filename);
      if (IS_ERR(filename)) goto out;
      error = execve1(filename, argv, env);
      putname(filename);
 out:
      unlock_kernel();
      return error;
}

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