diff options
Diffstat (limited to 'sys/amd64/ia32/ia32_exception.S')
| -rw-r--r-- | sys/amd64/ia32/ia32_exception.S | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/sys/amd64/ia32/ia32_exception.S b/sys/amd64/ia32/ia32_exception.S new file mode 100644 index 000000000000..42d0ff6c638b --- /dev/null +++ b/sys/amd64/ia32/ia32_exception.S @@ -0,0 +1,76 @@ +/*- + * Copyright (c) 2003 Peter Wemm + * All rights reserved. + * + * 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. + */ + +#include <machine/asmacros.h> + +#include "assym.inc" + + .text +/* + * Call gate entry for FreeBSD ELF and Linux/NetBSD syscall (int 0x80) + * + * This is a SDT_SYSIDT entry point (unlike the i386 port) so that we + * can do a swapgs before enabling interrupts. This is critical because + * if we took an interrupt before swapgs, the interrupt code would see + * that it originated in supervisor mode and skip the swapgs. + */ + SUPERALIGN_TEXT +IDTVEC(int0x80_syscall_pti) + PTI_UENTRY has_err=0 + jmp int0x80_syscall_common + SUPERALIGN_TEXT +IDTVEC(int0x80_syscall) + swapgs +int0x80_syscall_common: + pushq $2 /* sizeof "int 0x80" */ + subq $TF_ERR,%rsp /* skip over tf_trapno */ + movq %rdi,TF_RDI(%rsp) + movq PCPU(CURPCB),%rdi + andl $~PCB_FULL_IRET,PCB_FLAGS(%rdi) + SAVE_SEGS + movq %rax,TF_RAX(%rsp) + movq %rdx,TF_RDX(%rsp) + movq %rcx,TF_RCX(%rsp) + call handle_ibrs_entry + sti + movq %rsi,TF_RSI(%rsp) + movq %r8,TF_R8(%rsp) + movq %r9,TF_R9(%rsp) + movq %rbx,TF_RBX(%rsp) + movq %rbp,TF_RBP(%rsp) + movq %r10,TF_R10(%rsp) + movq %r11,TF_R11(%rsp) + movq %r12,TF_R12(%rsp) + movq %r13,TF_R13(%rsp) + movq %r14,TF_R14(%rsp) + movq %r15,TF_R15(%rsp) + movl $TF_HASSEGS,TF_FLAGS(%rsp) + pushfq + andq $~(PSL_D | PSL_AC),(%rsp) + popfq + movq %rsp, %rdi + call ia32_syscall + jmp doreti |