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 * $FreeBSD$ 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 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 andl $~PCB_FULL_IRET,PCB_FLAGS(%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