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freebsd
GitHub Repository: freebsd/freebsd-src
 Path: blob/main/sys/amd64/ia32/ia32_exception.S
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/*-

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 * Copyright (c) 2003 Peter Wemm

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 * All rights reserved.

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 *

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 * Redistribution and use in source and binary forms, with or without

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 * modification, are permitted provided that the following conditions

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 * are met:

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 * 1. Redistributions of source code must retain the above copyright

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 *    notice, this list of conditions and the following disclaimer.

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 * 2. Redistributions in binary form must reproduce the above copyright

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 *    notice, this list of conditions and the following disclaimer in the

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 *    documentation and/or other materials provided with the distribution.

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 *

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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND

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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE

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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

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 * SUCH DAMAGE.

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 */

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#include <machine/asmacros.h>

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#include "assym.inc"

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	.text

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/*

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 * Call gate entry for FreeBSD ELF and Linux/NetBSD syscall (int 0x80)

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 *

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 * This is a SDT_SYSIDT entry point (unlike the i386 port) so that we

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 * can do a swapgs before enabling interrupts.  This is critical because

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 * if we took an interrupt before swapgs, the interrupt code would see

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 * that it originated in supervisor mode and skip the swapgs.

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 */

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	SUPERALIGN_TEXT

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IDTVEC(int0x80_syscall_pti)

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	PTI_UENTRY has_err=0

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	jmp	int0x80_syscall_common

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	SUPERALIGN_TEXT

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IDTVEC(int0x80_syscall)

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	swapgs

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int0x80_syscall_common:

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	pushq	$2			/* sizeof "int 0x80" */

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	subq	$TF_ERR,%rsp		/* skip over tf_trapno */

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	movq	%rdi,TF_RDI(%rsp)

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	movq	PCPU(CURPCB),%rdi

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	andl	$~PCB_FULL_IRET,PCB_FLAGS(%rdi)

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	SAVE_SEGS

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	movq	%rax,TF_RAX(%rsp)

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	movq	%rdx,TF_RDX(%rsp)

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	movq	%rcx,TF_RCX(%rsp)

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	call	handle_ibrs_entry

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	sti

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	movq	%rsi,TF_RSI(%rsp)

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	movq	%r8,TF_R8(%rsp)

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	movq	%r9,TF_R9(%rsp)

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	movq	%rbx,TF_RBX(%rsp)

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	movq	%rbp,TF_RBP(%rsp)

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	movq	%r10,TF_R10(%rsp)

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	movq	%r11,TF_R11(%rsp)

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	movq	%r12,TF_R12(%rsp)

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	movq	%r13,TF_R13(%rsp)

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	movq	%r14,TF_R14(%rsp)

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	movq	%r15,TF_R15(%rsp)

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	movl	$TF_HASSEGS,TF_FLAGS(%rsp)

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	pushfq

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	andq	$~(PSL_D | PSL_AC),(%rsp)

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	popfq

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	movq	%rsp, %rdi

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	call	ia32_syscall

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	jmp	doreti

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