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