2 * Copyright (c) 2007 Matthew T. Emmerton <matt@gsicomp.on.ca>
4 * Copyright (c) 2007 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
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Neither the name of the author nor the names of its contributors
13 * may be used to endorse or promote products derived from this software
14 * without specific prior written permission.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * $DragonFly: src/lib/libc/amd64/gen/mcontext.S,v 1.2 2008/08/28 23:36:31 dillon Exp $
31 #include <machine/asm.h>
32 #include <asmcontext.h>
35 * int get_mcontext(mcontext_t *mcp : rdi)
37 * Copy the caller's context into the mcontext, %eax excepted.
40 .set get_mcontext,_get_mcontext
42 /* MC_ONSTACK(%rdi) */
43 movq %rdi,MC_RDI(%rdi)
44 movq %rsi,MC_RSI(%rdi)
45 movq %rdx,MC_RDX(%rdi)
48 /* movq %rax,MC_RAX(%rdi) - not needed, replaced below */
49 movq %rbx,MC_RBX(%rdi)
50 movq %rbp,MC_RBP(%rdi)
51 movq %r10,MC_R10(%rdi)
52 movq %r11,MC_R11(%rdi)
53 movq %r12,MC_R12(%rdi)
54 movq %r13,MC_R13(%rdi)
55 movq %r14,MC_R14(%rdi)
56 movq %r15,MC_R15(%rdi)
61 /* MC_RIP(%rdi) - see below */
64 /* MC_RSP(%rdi) - see below */
68 * Saved stack pointer as if we had returned from this
71 movq %rsp,MC_RSP(%eax)
80 * Saved instruction pointer as if we had returned from
84 movq %rdx,MC_RIP(%rdi)
87 * On restore as if procedure returned the value 1
94 movl $SIZEOF_MCONTEXT_T,MC_LEN(%eax)
104 * int set_mcontext(mcontext_t *mcp)
106 * Load the register context, effectively switching to the
110 .set set_mcontext,_set_mcontext
112 /* MC_ONSTACK(%rdi) */
113 /* MC_RDI(%rdi) - see below */
114 movq MC_RSI(%rdi),%rsi
115 movq MC_RDX(%rdi),%rdx
118 /* MC_RAX(%rdi) - see below */
119 movq MC_RBX(%rdi),%rbx
120 movq MC_RBP(%rdi),%rbp
121 movq MC_R10(%rdi),%r10
122 movq MC_R11(%rdi),%r11
123 movq MC_R12(%rdi),%r12
124 movq MC_R13(%rdi),%r13
125 movq MC_R14(%rdi),%r14
126 movq MC_R15(%rdi),%r15
127 /* MC_TRAPNO(%rdi) */
131 /* MC_RIP(%rdi) - see below */
133 /* MC_RFLAGS(%rdi) */
134 /* MC_RSP(%rdi) - see below */
138 * Load the new stack pointer
140 movq MC_RSP(%rdi),%rsp
148 * Push the return pc so we can 'ret' to it.
153 * Finally rax and rdi
155 movq MC_RAX(%rdi),%rax
156 movq MC_RDI(%rdi),%rdi