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/*-
* Copyright (c) 2016 The FreeBSD Foundation
* All rights reserved.
*
* This software was developed by Konstantin Belousov under sponsorship
* from the FreeBSD Foundation.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
.macro EH N, err=1
.align 8
.globl EXC\N\()_handler
EXC\N\()_handler:
.if \err != 1
pushq $0
.endif
pushq %rax
pushq %rdx
pushq %rcx
movl $\N,%ecx
jmp all_handlers
.endm
.text
EH 0,0
EH 1,0
EH 2,0
EH 3,0
EH 4,0
EH 5,0
EH 6,0
EH 7,0
EH 8
EH 9,0
EH 10
EH 11
EH 12
EH 13
EH 14
EH 16,0
EH 17
EH 18,0
EH 19,0
EH 20,0
.globl exc_rsp
all_handlers:
cmpq %rsp,exc_rsp(%rip)
je exception
/*
* Interrupt, not exception.
* First, copy the hardware interrupt frame to the previous stack.
* Our handler always has private IST stack.
*/
movq (6*8)(%rsp),%rax /* saved %rsp value, AKA old stack */
subq (5*8),%rax
movq (3*8)(%rsp),%rdx /* copy %rip to old stack */
movq %rdx,(%rax)
movq (4*8)(%rsp),%rdx /* copy %cs */
movq %rdx,(1*8)(%rax)
movq (5*8)(%rsp),%rdx /* copy %rflags */
movq %rdx,(2*8)(%rax)
movq (6*8)(%rsp),%rdx /* copy %rsp */
movq %rdx,(3*8)(%rax)
movq (7*8)(%rsp),%rdx /* copy %ss */
movq %rdx,(4*8)(%rax)
/*
* Now simulate invocation of the original interrupt handler
* with retq. We switch stacks and execute retq from the old
* stack since there is no free registers at the last moment.
*/
subq $16,%rax
leaq fw_intr_handlers(%rip),%rdx
movq (%rdx,%rcx,8),%rdx /* push intr handler address on old stack */
movq %rdx,8(%rax)
movq (2*8)(%rsp),%rcx /* saved %rax is put on top of old stack */
movq %rcx,(%rax)
movq (%rsp),%rcx
movq 8(%rsp),%rdx
movq 32(%rsp),%rsp /* switch to old stack */
popq %rax
retq
exception:
/*
* Form the struct trapframe on our IST stack.
* Skip three words, which are currently busy with temporal
* saves.
*/
pushq %r15
pushq %r14
pushq %r13
pushq %r12
pushq %r11
pushq %r10
pushq %rbp
pushq %rbx
pushq $0 /* %rax */
pushq %r9
pushq %r8
pushq $0 /* %rcx */
pushq $0 /* %rdx */
pushq %rsi
pushq %rdi
/*
* Move %rax, %rdx, %rcx values into the final location,
* from the three words which were skipped above.
*/
movq 0x88(%rsp),%rax
movq %rax,0x30(%rsp) /* tf_rax */
movq 0x78(%rsp),%rax
movq %rax,0x18(%rsp) /* tf_rcx */
movq 0x80(%rsp),%rax
movq %rax,0x10(%rsp) /* tf_rdx */
/*
* And fill the three words themself.
*/
movq %cr2,%rax
movq %rax,0x80(%rsp) /* tf_addr */
movl %ecx,0x78(%rsp) /* tf_trapno */
movw %ds,0x8e(%rsp)
movw %es,0x8c(%rsp)
movw %fs,0x7c(%rsp)
movw %gs,0x7e(%rsp)
movw $0,0x88(%rsp) /* tf_flags */
/*
* Call dump routine.
*/
movq %rsp,%rdi
callq report_exc
/*
* Hang after reporting. Interrupts are already disabled.
*/
1:
hlt
jmp 1b
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