ia32_exception.S revision 209483 
150477Speter/*-
25540Sugen * Copyright (c) 2003 Peter Wemm
370711Sobrien * All rights reserved.
470711Sobrien *
540440Speter * Redistribution and use in source and binary forms, with or without
6134346Sru * modification, are permitted provided that the following conditions
7152928Sume * are met:
870711Sobrien * 1. Redistributions of source code must retain the above copyright
945872Speter *    notice, this list of conditions and the following disclaimer.
105540Sugen * 2. Redistributions in binary form must reproduce the above copyright
115544Sugen *    notice, this list of conditions and the following disclaimer in the
125540Sugen *    documentation and/or other materials provided with the distribution.
1316619Sbde *
145540Sugen * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
1529272Speter * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
1629272Speter * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
1729272Speter * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
185540Sugen * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19152928Sume * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20152928Sume * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21152928Sume * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22152928Sume * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23152928Sume * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24152928Sume * SUCH DAMAGE.
25152928Sume *
26152928Sume * $FreeBSD: head/sys/amd64/ia32/ia32_exception.S 209483 2010-06-23 20:44:07Z kib $
27152928Sume */
28152928Sume
29152928Sume#include <machine/asmacros.h>
30152928Sume
31152928Sume#include "assym.s"
3260966Speter
33	.text
34/*
35 * Call gate entry for FreeBSD ELF and Linux/NetBSD syscall (int 0x80)
36 *
37 * This is a SDT_SYSIDT entry point (unlike the i386 port) so that we
38 * can do a swapgs before enabling interrupts.  This is critical because
39 * if we took an interrupt before swapgs, the interrupt code would see
40 * that it originated in supervisor mode and skip the swapgs.
41 */
42	SUPERALIGN_TEXT
43IDTVEC(int0x80_syscall)
44	swapgs
45	pushq	$2			/* sizeof "int 0x80" */
46	subq	$TF_ERR,%rsp		/* skip over tf_trapno */
47	movq	%rdi,TF_RDI(%rsp)
48	movq	PCPU(CURPCB),%rdi
49	movb	$0,PCB_FULL_IRET(%rdi)
50	movw	%fs,TF_FS(%rsp)
51	movw	%gs,TF_GS(%rsp)
52	movw	%es,TF_ES(%rsp)
53	movw	%ds,TF_DS(%rsp)
54	sti
55	movq	%rsi,TF_RSI(%rsp)
56	movq	%rdx,TF_RDX(%rsp)
57	movq	%rcx,TF_RCX(%rsp)
58	movq	%r8,TF_R8(%rsp)
59	movq	%r9,TF_R9(%rsp)
60	movq	%rax,TF_RAX(%rsp)
61	movq	%rbx,TF_RBX(%rsp)
62	movq	%rbp,TF_RBP(%rsp)
63	movq	%r10,TF_R10(%rsp)
64	movq	%r11,TF_R11(%rsp)
65	movq	%r12,TF_R12(%rsp)
66	movq	%r13,TF_R13(%rsp)
67	movq	%r14,TF_R14(%rsp)
68	movq	%r15,TF_R15(%rsp)
69	movl	$TF_HASSEGS,TF_FLAGS(%rsp)
70	cld
71	FAKE_MCOUNT(TF_RIP(%rsp))
72	movq	%rsp, %rdi
73	call	ia32_syscall
74	MEXITCOUNT
75	jmp	doreti
76