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
36 #include <machine/asm.h>
37 #include <asmcontext.h>
40 * This function is special-cased because the context it saves
41 * includes a stale stack context (because it returns before the
42 * caller presumably makes the call to setcontext()).
45 .set getcontext,_getcontext
48 * Retrieve the current signal mask and save it in &ucp->uc_sigmask.
50 pushq %rdi /* save ucontext_t pointer passed */
52 addq $UC_SIGMASK,%rdx /* pointer to signal mask */
55 call PIC_PLT(CNAME(_sigprocmask))
57 * Save what we need because our stack context is going stale.
61 movq (%rsp),%r8 /* save return PC in %r9 */
62 addq $UC_MCONTEXT,%rdi
63 call PIC_PLT(CNAME(get_mcontext)) /* returns non-zero on resume */
64 cmpl $0,%eax /* return type is int */
67 * On resume, resave the stale return pc and restore the signal
68 * mask (signals are blocked right now from the setcontext call).
70 movq %r8,(%rsp) /* re-save the return PC */
74 movq $SIG_SETMASK,%rdi
75 call PIC_PLT(CNAME(_sigprocmask)) /* retrieve & save signal mask */
77 movl $0,%eax /* return success */
82 movq PIC_GOT(HIDENAME(cerror)),%rdx