arch/um/kernel/exec.c

   1 /*
   2  * Copyright (C) 2000, 2001 Jeff Dike (jdike@karaya.com)
   3  * Licensed under the GPL
   4  */
   5
   6 #include "linux/slab.h"
   7 #include "linux/smp_lock.h"
   8 #include "linux/ptrace.h"
   9 #include "asm/ptrace.h"
  10 #include "asm/pgtable.h"
  11 #include "asm/tlbflush.h"
  12 #include "asm/uaccess.h"
  13 #include "kern_util.h"
  14 #include "as-layout.h"
  15 #include "mem_user.h"
  16 #include "kern.h"
  17 #include "irq_user.h"
  18 #include "tlb.h"
  19 #include "os.h"
  20 #include "choose-mode.h"
  21 #include "mode_kern.h"
  22
  23 void flush_thread(void)
  24 {
  25         arch_flush_thread(&current->thread.arch);
  26         CHOOSE_MODE(flush_thread_tt(), flush_thread_skas());
  27 }
  28
  29 void start_thread(struct pt_regs *regs, unsigned long eip, unsigned long esp)
  30 {
  31         CHOOSE_MODE_PROC(start_thread_tt, start_thread_skas, regs, eip, esp);
  32 }
  33
  34 #ifdef CONFIG_TTY_LOG
  35 extern void log_exec(char **argv, void *tty);
  36 #endif
  37
  38 static long execve1(char *file, char __user * __user *argv,
  39                     char __user *__user *env)
  40 {
  41         long error;
  42 #ifdef CONFIG_TTY_LOG
  43         struct tty_struct *tty;
  44
  45         mutex_lock(&tty_mutex);
  46         tty = get_current_tty();
  47         if (tty)
  48                 log_exec(argv, tty);
  49         mutex_unlock(&tty_mutex);
  50 #endif
  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                 set_cmdline(current_cmd());
  60         }
  61         return(error);
  62 }
  63
  64 long um_execve(char *file, char __user *__user *argv, char __user *__user *env)
  65 {
  66         long err;
  67
  68         err = execve1(file, argv, env);
  69         if(!err)
  70                 do_longjmp(current->thread.exec_buf, 1);
  71         return(err);
  72 }
  73
  74 long sys_execve(char __user *file, char __user *__user *argv,
  75                 char __user *__user *env)
  76 {
  77         long error;
  78         char *filename;
  79
  80         lock_kernel();
  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         unlock_kernel();
  88         return(error);
  89 }