78 lines
2.7 KiB
C
78 lines
2.7 KiB
C
/* $OpenBSD: DEFS.h,v 1.4 2023/12/11 22:24:15 kettenis Exp $ */
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/*
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* Copyright (c) 2015,2018,2021 Philip Guenther <guenther@openbsd.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <machine/asm.h>
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/* ARM just had to be different... */
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#ifndef __arm__
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# define _FUNC_TYPE @function
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# define _PROGBITS @progbits
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#else
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# define _FUNC_TYPE #function
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# define _PROGBITS %progbits
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#endif
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/*
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* We define a hidden alias with the prefix "_libc_" for each global symbol
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* that may be used internally. By referencing _libc_x instead of x, other
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* parts of libc prevent overriding by the application and avoid unnecessary
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* relocations.
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*/
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#define _HIDDEN(x) _libc_##x
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#define _HIDDEN_ALIAS(x,y) \
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STRONG_ALIAS(_HIDDEN(x),y); \
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.hidden _HIDDEN(x)
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#define _HIDDEN_FALIAS(x,y) \
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_HIDDEN_ALIAS(x,y); \
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.type _HIDDEN(x),_FUNC_TYPE
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/*
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* For functions implemented in ASM that aren't syscalls.
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* END_STRONG(x) Like DEF_STRONG() in C; for standard/reserved C names
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* END_WEAK(x) Like DEF_WEAK() in C; for non-ISO C names
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* END_BUILTIN(x) If compiling with clang, then just END() and
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* mark it .protected, else be like END_STRONG();
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* for clang builtins like memcpy
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*
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* If a 'BUILTIN' function needs be referenced by other ASM code, then use
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* _BUILTIN(x) If compiled with clang, then just x, otherwise
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* _HIDDEN(x)
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*
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* _END(x) Set a size on a symbol, like END(), but even for
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* symbols with no matching ENTRY(). (On alpha and
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* mips64, END() generates .end which requires a
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* matching .ent from ENTRY())
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*/
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#define END_STRONG(x) END(x); _HIDDEN_FALIAS(x,x); _END(_HIDDEN(x))
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#define END_WEAK(x) END_STRONG(x); .weak x
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#ifdef __clang__
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#define END_BUILTIN(x) END(x); .protected x
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#define _BUILTIN(x) x
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#else
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#define END_BUILTIN(x) END_STRONG(x)
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#define _BUILTIN(x) _HIDDEN(x)
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#endif
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#define _END(x) .size x, . - x
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#define PINSYSCALL(sysno, label) \
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.pushsection .openbsd.syscalls,"",_PROGBITS; \
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.p2align 2; \
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.long label; \
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.long sysno; \
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.popsection;
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