4a72842a5f
The conditional jump can only be performed to targets up to 1MB in either direction and does not work too well when linker places cerror further that that from the caller. In that case linker will complain about relocation overflows. Reviewed by: emaste, andrew Differential Revision: https://reviews.freebsd.org/D10305
72 lines
2.4 KiB
C
72 lines
2.4 KiB
C
/*-
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* Copyright (c) 2014 Andrew Turner
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* Copyright (c) 2015 The FreeBSD Foundation
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* All rights reserved.
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*
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* This software was developed by Andrew Turner under
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* sponsorship from the FreeBSD Foundation.
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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 <sys/syscall.h>
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#include <machine/asm.h>
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#define _SYSCALL(name) \
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mov x8, SYS_ ## name; \
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svc 0
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#define SYSCALL(name) \
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ENTRY(__sys_##name); \
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WEAK_REFERENCE(__sys_##name, name); \
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WEAK_REFERENCE(__sys_##name, _##name); \
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_SYSCALL(name); \
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ret; \
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END(__sys_##name)
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/*
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* Conditional jumps can only go up to one megabyte in either
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* direction, and cerror can be located anywhere, so we have
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* to jump around to use more capable unconditional branch
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* instruction.
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*/
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#define PSEUDO(name) \
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ENTRY(__sys_##name); \
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WEAK_REFERENCE(__sys_##name, _##name); \
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_SYSCALL(name); \
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b.cs 1f; \
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ret; \
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1: b cerror; \
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END(__sys_##name)
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#define RSYSCALL(name) \
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ENTRY(__sys_##name); \
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WEAK_REFERENCE(__sys_##name, name); \
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WEAK_REFERENCE(__sys_##name, _##name); \
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_SYSCALL(name); \
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b.cs 1f; \
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ret; \
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1: b cerror; \
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END(__sys_##name)
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