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: src/sys/amd64/ia32/ia32_exception.S,v 1.5 2006/12/17 06:48:39 kmacy Exp $
27 */
28
29 #include <machine/asmacros.h>
30
31 #include "assym.s"
32
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
43 IDTVEC(int0x80_syscall)
44 swapgs
45 sti
46 pushq $2 /* sizeof "int 0x80" */
47 subq $TF_ERR,%rsp /* skip over tf_trapno */
48 movq %rdi,TF_RDI(%rsp)
49 movq %rsi,TF_RSI(%rsp)
50 movq %rdx,TF_RDX(%rsp)
51 movq %rcx,TF_RCX(%rsp)
52 movq %r8,TF_R8(%rsp)
53 movq %r9,TF_R9(%rsp)
54 movq %rax,TF_RAX(%rsp)
55 movq %rbx,TF_RBX(%rsp)
56 movq %rbp,TF_RBP(%rsp)
57 movq %r10,TF_R10(%rsp)
58 movq %r11,TF_R11(%rsp)
59 movq %r12,TF_R12(%rsp)
60 movq %r13,TF_R13(%rsp)
61 movq %r14,TF_R14(%rsp)
62 movq %r15,TF_R15(%rsp)
63 FAKE_MCOUNT(TF_RIP(%rsp))
64 movq %rsp, %rdi
65 call ia32_syscall
66 MEXITCOUNT
67 jmp doreti
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