mirror of
https://git.hardenedbsd.org/hardenedbsd/HardenedBSD.git
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aa3ea612be
Reviewed by: jhb Sponsored by: The FreeBSD Foundation Differential revision: https://reviews.freebsd.org/D29529
79 lines
2.6 KiB
ArmAsm
79 lines
2.6 KiB
ArmAsm
/*-
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* Copyright (c) 2003 Peter Wemm
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <machine/asmacros.h>
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#include "assym.inc"
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.text
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/*
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* Call gate entry for FreeBSD ELF and Linux/NetBSD syscall (int 0x80)
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*
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* This is a SDT_SYSIDT entry point (unlike the i386 port) so that we
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* can do a swapgs before enabling interrupts. This is critical because
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* if we took an interrupt before swapgs, the interrupt code would see
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* that it originated in supervisor mode and skip the swapgs.
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*/
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SUPERALIGN_TEXT
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IDTVEC(int0x80_syscall_pti)
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PTI_UENTRY has_err=0
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jmp int0x80_syscall_common
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SUPERALIGN_TEXT
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IDTVEC(int0x80_syscall)
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swapgs
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int0x80_syscall_common:
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pushq $2 /* sizeof "int 0x80" */
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subq $TF_ERR,%rsp /* skip over tf_trapno */
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movq %rdi,TF_RDI(%rsp)
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movq PCPU(CURPCB),%rdi
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andl $~PCB_FULL_IRET,PCB_FLAGS(%rdi)
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SAVE_SEGS
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movq %rax,TF_RAX(%rsp)
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movq %rdx,TF_RDX(%rsp)
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movq %rcx,TF_RCX(%rsp)
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call handle_ibrs_entry
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sti
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movq %rsi,TF_RSI(%rsp)
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movq %r8,TF_R8(%rsp)
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movq %r9,TF_R9(%rsp)
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movq %rbx,TF_RBX(%rsp)
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movq %rbp,TF_RBP(%rsp)
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movq %r10,TF_R10(%rsp)
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movq %r11,TF_R11(%rsp)
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movq %r12,TF_R12(%rsp)
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movq %r13,TF_R13(%rsp)
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movq %r14,TF_R14(%rsp)
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movq %r15,TF_R15(%rsp)
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movl $TF_HASSEGS,TF_FLAGS(%rsp)
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pushfq
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andq $~(PSL_D | PSL_AC),(%rsp)
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popfq
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movq %rsp, %rdi
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call ia32_syscall
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jmp doreti
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