2 * Copyright (c) 2006 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * $DragonFly: src/sys/platform/vkernel/i386/locore.s,v 1.6 2007/01/08 03:33:43 dillon Exp $
37 #include <sys/syscall.h>
38 #include <machine/asmacros.h>
39 #include <machine/psl.h>
43 * The sysinit and sysuninit sections have to be read-write data
44 * sections, not read-only data sections.
46 .section set_sysinit_set, "aw"
47 .section set_sysuninit_set, "aw"
50 ALIGN_DATA
/* just to be sure */
53 * Normally the startup code would begin here, but this is a
54 * virtual kernel so we just have a main() in platform/init.c
58 /**********************************************************************
60 * Signal trampoline, copied to top of user stack
62 * arguments: %rdi, %rsi, %rdx, %rcx
64 NON_GPROF_ENTRY
(sigcode
)
65 call
*SIGF_HANDLER
(%rsp
) /* call signal handler */
66 lea SIGF_UC
(%rsp
),%rdi
/* get ucontext_t */
67 pushq $
0 /* junk to fake return addr. */
68 movq $SYS_sigreturn
,%rax
69 syscall
/* enter kernel with args */
70 0: hlt
/* trap priviliged instruction */
76 /* void reset_dbregs() */
78 movq $
0x200,%rax
/* the manual says that bit 10 must be set to 1 */
79 movq
%rax
,%dr7
/* disable all breapoints first */
91 .long esigcode - sigcode