ia32_exception.S revision 114987 
1/*-
2 * Copyright (c) 2003 Peter Wemm
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: head/sys/amd64/ia32/ia32_exception.S 114987 2003-05-14 04:10:49Z peter $
27 */
28
29#include <machine/asmacros.h>
30
31#include "assym.s"
32
33#define	IDTVEC(name)	ALIGN_TEXT; .globl __CONCAT(X,name); \
34			.type __CONCAT(X,name),@function; __CONCAT(X,name):
35
36	.text
37/*
38 * Call gate entry for FreeBSD ELF and Linux/NetBSD syscall (int 0x80)
39 *
40 * This is a SDT_SYSIDT entry point (unlike the i386 port) so that we
41 * can do a swapgs before enabling interrupts.  This is critical because
42 * if we took an interrupt before swapgs, the interrupt code would see
43 * that it originated in supervisor mode and skip the swapgs.
44 */
45	SUPERALIGN_TEXT
46IDTVEC(int0x80_syscall)
47	swapgs
48	sti
49	pushq	$2			/* sizeof "int 0x80" */
50	subq	$TF_ERR,%rsp		/* skip over tf_trapno */
51	movq	%rdi,TF_RDI(%rsp)
52	movq	%rsi,TF_RSI(%rsp)
53	movq	%rdx,TF_RDX(%rsp)
54	movq	%rcx,TF_RCX(%rsp)
55	movq	%r8,TF_R8(%rsp)
56	movq	%r9,TF_R9(%rsp)
57	movq	%rax,TF_RAX(%rsp)
58	movq	%rbx,TF_RBX(%rsp)
59	movq	%rbp,TF_RBP(%rsp)
60	movq	%r10,TF_R10(%rsp)
61	movq	%r11,TF_R11(%rsp)
62	movq	%r12,TF_R12(%rsp)
63	movq	%r13,TF_R13(%rsp)
64	movq	%r14,TF_R14(%rsp)
65	movq	%r15,TF_R15(%rsp)
66	FAKE_MCOUNT(13*4(%rsp))
67	call	ia32_syscall
68	MEXITCOUNT
69	jmp	doreti
70