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 "linux/fs.h"
  10 #include "asm/ptrace.h"
  11 #include "asm/pgtable.h"
  12 #include "asm/tlbflush.h"
  13 #include "asm/uaccess.h"
  14 #include "kern_util.h"
  15 #include "as-layout.h"
  16 #include "mem_user.h"
  17 #include "kern.h"
  18 #include "irq_user.h"
  19 #include "tlb.h"
  20 #include "os.h"
  21 #include "choose-mode.h"
  22 #include "mode_kern.h"
  23
  24 void flush_thread(void)
  25 {
  26         arch_flush_thread(&current->thread.arch);
  27         CHOOSE_MODE(flush_thread_tt(), flush_thread_skas());
  28 }
  29
  30 void start_thread(struct pt_regs *regs, unsigned long eip, unsigned long esp)
  31 {
  32         CHOOSE_MODE_PROC(start_thread_tt, start_thread_skas, regs, eip, esp);
  33 }
  34
  35 #ifdef CONFIG_TTY_LOG
  36 extern void log_exec(char **argv, void *tty);
  37 #endif
  38
  39 static long execve1(char *file, char __user * __user *argv,
  40                     char __user *__user *env)
  41 {
  42         long error;
  43 #ifdef CONFIG_TTY_LOG
  44         struct tty_struct *tty;
  45
  46         mutex_lock(&tty_mutex);
  47         tty = get_current_tty();
  48         if (tty)
  49                 log_exec(argv, tty);
  50         mutex_unlock(&tty_mutex);
  51 #endif
  52         error = do_execve(file, argv, env, &current->thread.regs);
  53         if (error == 0){
  54                 task_lock(current);
  55                 current->ptrace &= ~PT_DTRACE;
  56 #ifdef SUBARCH_EXECVE1
  57                 SUBARCH_EXECVE1(&current->thread.regs.regs);
  58 #endif
  59                 task_unlock(current);
  60                 set_cmdline(current_cmd());
  61         }
  62         return(error);
  63 }
  64
  65 long um_execve(char *file, char __user *__user *argv, char __user *__user *env)
  66 {
  67         long err;
  68
  69         err = execve1(file, argv, env);
  70         if(!err)
  71                 do_longjmp(current->thread.exec_buf, 1);
  72         return(err);
  73 }
  74
  75 long sys_execve(char __user *file, char __user *__user *argv,
  76                 char __user *__user *env)
  77 {
  78         long error;
  79         char *filename;
  80
  81         lock_kernel();
  82         filename = getname(file);
  83         error = PTR_ERR(filename);
  84         if (IS_ERR(filename)) goto out;
  85         error = execve1(filename, argv, env);
  86         putname(filename);
  87  out:
  88         unlock_kernel();
  89         return(error);
  90 }