arch/um/kernel/exec_kern.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 "user_util.h"
  14 #include "kern_util.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 "time_user.h"
  21 #include "choose-mode.h"
  22 #include "mode_kern.h"
  23
  24 void flush_thread(void)
  25 {
  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 extern void log_exec(char **argv, void *tty);
  35
  36 static long execve1(char *file, char __user * __user *argv,
  37                     char *__user __user *env)
  38 {
  39         long error;
  40
  41 #ifdef CONFIG_TTY_LOG
  42         log_exec(argv, current->tty);
  43 #endif
  44         error = do_execve(file, argv, env, &current->thread.regs);
  45         if (error == 0){
  46                 task_lock(current);
  47                 current->ptrace &= ~PT_DTRACE;
  48                 task_unlock(current);
  49                 set_cmdline(current_cmd());
  50         }
  51         return(error);
  52 }
  53
  54 long um_execve(char *file, char __user *__user *argv, char __user *__user *env)
  55 {
  56         long err;
  57
  58         err = execve1(file, argv, env);
  59         if(!err)
  60                 do_longjmp(current->thread.exec_buf, 1);
  61         return(err);
  62 }
  63
  64 long sys_execve(char *file, char __user *__user *argv,
  65                 char __user *__user *env)
  66 {
  67         long error;
  68         char *filename;
  69
  70         lock_kernel();
  71         filename = getname((char __user *) file);
  72         error = PTR_ERR(filename);
  73         if (IS_ERR(filename)) goto out;
  74         error = execve1(filename, argv, env);
  75         putname(filename);
  76  out:
  77         unlock_kernel();
  78         return(error);
  79 }
  80
  81 /*
  82  * Overrides for Emacs so that we follow Linus's tabbing style.
  83  * Emacs will notice this stuff at the end of the file and automatically
  84  * adjust the settings for this buffer only.  This must remain at the end
  85  * of the file.
  86  * ---------------------------------------------------------------------------
  87  * Local variables:
  88  * c-file-style: "linux"
  89  * End:
  90  */