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d957343f87
To avoid clobbering of any registers by the trampoline code use Linux way to call signal handlers. I.e., we are out from the kernel right into the signal handler, put return address from the signal handler into the link register. The mysterious NOP is required for some unwinders (e.g. libc++) that unconditionally subtract one from the result of _Unwind_GetIP() in order to identify the calling function. MFC after: 1 week
55 lines
1.9 KiB
NASM
55 lines
1.9 KiB
NASM
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (C) 2018 Turing Robotic Industries Inc.
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* Copyright (C) 2020 Andrew Turner <andrew@FreeBSD.org>
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* Copyright (C) 2022 Dmitry Chagin <dchagin@FreeBSD.org>
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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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/*
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* arm64 Linux VDSO signal trampoline.
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*/
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#include <machine/asm.h>
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#include <arm64/linux/linux_syscall.h>
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.data
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.globl linux_platform
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linux_platform:
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.asciz "aarch64"
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.text
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EENTRY(__kernel_rt_sigreturn)
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nop /* This is what Linux calls a "Mysterious NOP". */
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.globl __user_rt_sigreturn
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__user_rt_sigreturn:
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mov x8, #LINUX_SYS_linux_rt_sigreturn
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svc #0
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EEND(__kernel_rt_sigreturn)
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