ia32_exception.S

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    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.inc"
   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_pti)
   44         PTI_UENTRY has_err=0
   45         jmp     int0x80_syscall_common
   46         SUPERALIGN_TEXT
   47 IDTVEC(int0x80_syscall)
   48         swapgs
   49 int0x80_syscall_common:
   50         pushq   $2                      /* sizeof "int 0x80" */
   51         subq    $TF_ERR,%rsp            /* skip over tf_trapno */
   52         movq    %rdi,TF_RDI(%rsp)
   53         movq    PCPU(CURPCB),%rdi
   54         andl    $~PCB_FULL_IRET,PCB_FLAGS(%rdi)
   55         SAVE_SEGS
   56         movq    %rax,TF_RAX(%rsp)
   57         movq    %rdx,TF_RDX(%rsp)
   58         movq    %rcx,TF_RCX(%rsp)
   59         call    handle_ibrs_entry
   60         sti
   61         movq    %rsi,TF_RSI(%rsp)
   62         movq    %r8,TF_R8(%rsp)
   63         movq    %r9,TF_R9(%rsp)
   64         movq    %rbx,TF_RBX(%rsp)
   65         movq    %rbp,TF_RBP(%rsp)
   66         movq    %r10,TF_R10(%rsp)
   67         movq    %r11,TF_R11(%rsp)
   68         movq    %r12,TF_R12(%rsp)
   69         movq    %r13,TF_R13(%rsp)
   70         movq    %r14,TF_R14(%rsp)
   71         movq    %r15,TF_R15(%rsp)
   72         movl    $TF_HASSEGS,TF_FLAGS(%rsp)
   73         pushfq
   74         andq    $~(PSL_D | PSL_AC),(%rsp)
   75         popfq
   76         movq    %rsp, %rdi
   77         call    ia32_syscall
   78         jmp     doreti

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FreeBSD/Linux Kernel Cross Reference sys/amd64/ia32/ia32_exception.S

FreeBSD/Linux Kernel Cross Reference
sys/amd64/ia32/ia32_exception.S