8f9635dc99
The Linux exports __kernel_sigreturn and __kernel_rt_sigreturn from the vdso. Modern glibc's sigaction sets the sa_restorer field of sigaction to the corresponding vdso __sigreturn, and sets the SA_RESTORER. Our signal trampolines uses the FreeBSD-way to call a signal handler, so does not use the sigaction's sa_restorer. However, as glibc's runtime linker depends on the existment of the vdso __sigreturn symbols, for all Linuxulators was added separate trampolines named __sigcode with DWARF anotations and left separate __sigreturn methods, which are exported. MFC after: 2 weeks
92 lines
2.7 KiB
NASM
92 lines
2.7 KiB
NASM
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2015-2022 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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#include "linux_assym.h" /* system definitions */
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#include <machine/asmacros.h> /* miscellaneous asm macros */
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#include <amd64/linux/linux_syscall.h> /* system call numbers */
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.data
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.globl linux_platform
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linux_platform:
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.asciz "x86_64"
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.text
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ENTRY(linux_rt_sigcode)
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.cfi_startproc
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.cfi_signal_frame
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.cfi_def_cfa %rsp, LINUX_RT_SIGF_SC
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.cfi_offset %r8, L_SC_R8
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.cfi_offset %r9, L_SC_R9
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.cfi_offset %r10, L_SC_R10
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.cfi_offset %r11, L_SC_R11
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.cfi_offset %r12, L_SC_R12
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.cfi_offset %r13, L_SC_R13
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.cfi_offset %r14, L_SC_R14
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.cfi_offset %r15, L_SC_R15
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.cfi_offset %rdi, L_SC_RDI
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.cfi_offset %rsi, L_SC_RSI
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.cfi_offset %rbp, L_SC_RBP
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.cfi_offset %rbx, L_SC_RBX
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.cfi_offset %rdx, L_SC_RDX
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.cfi_offset %rax, L_SC_RAX
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.cfi_offset %rcx, L_SC_RCX
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.cfi_offset %rip, L_SC_RIP
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.cfi_offset 49, L_SC_RFLAGS
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.cfi_offset %cs, L_SC_CS
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.cfi_offset %rsp, L_SC_RSP
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movq %rsp, %rbx /* rt_sigframe for rt_sigreturn */
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call *%rcx /* call signal handler */
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movq $LINUX_SYS_linux_rt_sigreturn, %rax
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syscall
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0: hlt
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jmp 0b
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.cfi_endproc
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END(linux_rt_sigcode)
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#if 0
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.section .note.Linux, "a",@note
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.long 2f - 1f /* namesz */
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.balign 4
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.long 4f - 3f /* descsz */
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.long 0
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1:
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.asciz "Linux"
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2:
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.balign 4
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3:
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.long LINUX_VERSION_CODE
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4:
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.balign 4
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.previous
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#endif
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