uml: remove task_protections
[linux-2.6.git] / arch / um / kernel / tt / exec_kern.c
1 /* 
2  * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
3  * Licensed under the GPL
4  */
5
6 #include "linux/kernel.h"
7 #include "linux/mm.h"
8 #include "asm/signal.h"
9 #include "asm/ptrace.h"
10 #include "asm/uaccess.h"
11 #include "asm/pgalloc.h"
12 #include "asm/tlbflush.h"
13 #include "kern_util.h"
14 #include "irq_user.h"
15 #include "mem_user.h"
16 #include "os.h"
17 #include "tlb.h"
18 #include "mode.h"
19
20 static int exec_tramp(void *sig_stack)
21 {
22         init_new_thread_stack(sig_stack, NULL);
23         init_new_thread_signals();
24         os_stop_process(os_getpid());
25         return(0);
26 }
27
28 void flush_thread_tt(void)
29 {
30         unsigned long stack;
31         int new_pid;
32
33         stack = alloc_stack(0, 0);
34         if(stack == 0){
35                 printk(KERN_ERR 
36                        "flush_thread : failed to allocate temporary stack\n");
37                 do_exit(SIGKILL);
38         }
39                 
40         new_pid = start_fork_tramp(task_stack_page(current), stack, 0, exec_tramp);
41         if(new_pid < 0){
42                 printk(KERN_ERR 
43                        "flush_thread : new thread failed, errno = %d\n",
44                        -new_pid);
45                 do_exit(SIGKILL);
46         }
47
48         if(current_thread->cpu == 0)
49                 forward_interrupts(new_pid);
50         current->thread.request.op = OP_EXEC;
51         current->thread.request.u.exec.pid = new_pid;
52         unprotect_stack((unsigned long) current_thread);
53         os_usr1_process(os_getpid());
54         change_sig(SIGUSR1, 1);
55
56         change_sig(SIGUSR1, 0);
57         enable_timer();
58         free_page(stack);
59         protect_memory(uml_reserved, high_physmem - uml_reserved, 1, 1, 0, 1);
60         stack_protections((unsigned long) current_thread);
61         force_flush_all();
62         unblock_signals();
63 }
64
65 void start_thread_tt(struct pt_regs *regs, unsigned long eip, 
66                      unsigned long esp)
67 {
68         set_fs(USER_DS);
69         flush_tlb_mm(current->mm);
70         PT_REGS_IP(regs) = eip;
71         PT_REGS_SP(regs) = esp;
72         PT_FIX_EXEC_STACK(esp);
73 }
74
75 /*
76  * Overrides for Emacs so that we follow Linus's tabbing style.
77  * Emacs will notice this stuff at the end of the file and automatically
78  * adjust the settings for this buffer only.  This must remain at the end
79  * of the file.
80  * ---------------------------------------------------------------------------
81  * Local variables:
82  * c-file-style: "linux"
83  * End:
84  */