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author | Warner Losh <imp@FreeBSD.org> | 2017-11-14 23:02:19 +0000 |
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committer | Warner Losh <imp@FreeBSD.org> | 2017-11-14 23:02:19 +0000 |
commit | ca987d4641cdcd7f27e153db17c5bf064934faf5 (patch) | |
tree | 6c3860e3ba8949be9528d644fbb7fa88d8bbbb79 /stand/efi/loader/arch/amd64/exc.S | |
parent | 6eac7115560381ce5c9e2939ab3fce82bb9b6a95 (diff) | |
download | src-ca987d4641cdcd7f27e153db17c5bf064934faf5.tar.gz src-ca987d4641cdcd7f27e153db17c5bf064934faf5.zip |
Move sys/boot to stand. Fix all references to new location
Sponsored by: Netflix
Notes
Notes:
svn path=/head/; revision=325834
Diffstat (limited to 'stand/efi/loader/arch/amd64/exc.S')
-rw-r--r-- | stand/efi/loader/arch/amd64/exc.S | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/stand/efi/loader/arch/amd64/exc.S b/stand/efi/loader/arch/amd64/exc.S new file mode 100644 index 000000000000..0035d4a37e20 --- /dev/null +++ b/stand/efi/loader/arch/amd64/exc.S @@ -0,0 +1,165 @@ +/*- + * 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. + * + * $FreeBSD$ + */ + + .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 |