1/*- 2 * Copyright (c) 2016 The FreeBSD Foundation 3 * 4 * This software was developed by Konstantin Belousov under sponsorship 5 * from the FreeBSD Foundation. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 .macro EH N, err=1 30 .align 8 31 .globl EXC\N\()_handler 32EXC\N\()_handler: 33 .if \err != 1 34 pushq $0 35 .endif 36 pushq %rax 37 pushq %rdx 38 pushq %rcx 39 movl $\N,%ecx 40 jmp all_handlers 41 .endm 42 43 .text 44 EH 0,0 45 EH 1,0 46 EH 2,0 47 EH 3,0 48 EH 4,0 49 EH 5,0 50 EH 6,0 51 EH 7,0 52 EH 8 53 EH 9,0 54 EH 10 55 EH 11 56 EH 12 57 EH 13 58 EH 14 59 EH 16,0 60 EH 17 61 EH 18,0 62 EH 19,0 63 EH 20,0 64 65 .globl exc_rsp 66all_handlers: 67 cmpq %rsp,exc_rsp(%rip) 68 je exception 69 70 /* 71 * Interrupt, not exception. 72 * First, copy the hardware interrupt frame to the previous stack. 73 * Our handler always has private IST stack. 74 */ 75 movq (6*8)(%rsp),%rax /* saved %rsp value, AKA old stack */ 76 subq (5*8),%rax 77 movq (3*8)(%rsp),%rdx /* copy %rip to old stack */ 78 movq %rdx,(%rax) 79 movq (4*8)(%rsp),%rdx /* copy %cs */ 80 movq %rdx,(1*8)(%rax) 81 movq (5*8)(%rsp),%rdx /* copy %rflags */ 82 movq %rdx,(2*8)(%rax) 83 movq (6*8)(%rsp),%rdx /* copy %rsp */ 84 movq %rdx,(3*8)(%rax) 85 movq (7*8)(%rsp),%rdx /* copy %ss */ 86 movq %rdx,(4*8)(%rax) 87 88 /* 89 * Now simulate invocation of the original interrupt handler 90 * with retq. We switch stacks and execute retq from the old 91 * stack since there is no free registers at the last moment. 92 */ 93 subq $16,%rax 94 leaq fw_intr_handlers(%rip),%rdx 95 movq (%rdx,%rcx,8),%rdx /* push intr handler address on old stack */ 96 movq %rdx,8(%rax) 97 movq (2*8)(%rsp),%rcx /* saved %rax is put on top of old stack */ 98 movq %rcx,(%rax) 99 movq (%rsp),%rcx 100 movq 8(%rsp),%rdx 101 102 movq 32(%rsp),%rsp /* switch to old stack */ 103 popq %rax 104 retq 105 106exception: 107 /* 108 * Form the struct trapframe on our IST stack. 109 * Skip three words, which are currently busy with temporal 110 * saves. 111 */ 112 pushq %r15 113 pushq %r14 114 pushq %r13 115 pushq %r12 116 pushq %r11 117 pushq %r10 118 pushq %rbp 119 pushq %rbx 120 pushq $0 /* %rax */ 121 pushq %r9 122 pushq %r8 123 pushq $0 /* %rcx */ 124 pushq $0 /* %rdx */ 125 pushq %rsi 126 pushq %rdi 127 128 /* 129 * Move %rax, %rdx, %rcx values into the final location, 130 * from the three words which were skipped above. 131 */ 132 movq 0x88(%rsp),%rax 133 movq %rax,0x30(%rsp) /* tf_rax */ 134 movq 0x78(%rsp),%rax 135 movq %rax,0x18(%rsp) /* tf_rcx */ 136 movq 0x80(%rsp),%rax 137 movq %rax,0x10(%rsp) /* tf_rdx */ 138 139 /* 140 * And fill the three words themself. 141 */ 142 movq %cr2,%rax 143 movq %rax,0x80(%rsp) /* tf_addr */ 144 movl %ecx,0x78(%rsp) /* tf_trapno */ 145 movw %ds,0x8e(%rsp) 146 movw %es,0x8c(%rsp) 147 movw %fs,0x7c(%rsp) 148 movw %gs,0x7e(%rsp) 149 movw $0,0x88(%rsp) /* tf_flags */ 150 151 /* 152 * Call dump routine. 153 */ 154 movq %rsp,%rdi 155 callq report_exc 156 157 /* 158 * Hang after reporting. Interrupts are already disabled. 159 */ 1601: 161 hlt 162 jmp 1b 163