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
20static 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
28void 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
65void 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 */
85