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freebsd
GitHub Repository: freebsd/freebsd-src
 Path: blob/main/lib/libc/amd64/amd64_archlevel.h
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/*-

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 * Copyright (c) 2023 The FreeBSD Foundation

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 *

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 * This software was developed by Robert Clausecker <[email protected]>

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 * under 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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/* must be macros so they can be accessed from assembly */

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#define X86_64_SCALAR    0 /* disable SIMD optimisations */

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#define	X86_64_BASELINE  1 /* CMOV, CX8, FPU, FXSR, MMX, OSFXSR, SSE, SSE2 */

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#define	X86_64_V2        2 /* CMPXCHG16B, LAHF-SAHF, POPCNT, SSE3, SSSE3, SSE4_1, SSE4_2 */

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#define	X86_64_V3        3 /* AVX, AVX2, BMI1, BMI2, F16C, FMA, LZCNT, MOVBE, OSXSAVE */

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#define	X86_64_V4        4 /* AVX512F, AVX512BW, AVX512CD, AVX512DQ, AVX512VL */

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#define	X86_64_MAX       X86_64_V4 /* highest supported architecture level */

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#define	X86_64_UNDEFINED -1 /* architecture level not set yet */

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#ifndef __ASSEMBLER__

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#include <dlfcn.h>

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dlfunc_t	__archlevel_resolve(u_int, u_int, u_int, u_int,

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		    int32_t[X86_64_MAX + 1]) __hidden;

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#else

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#include <machine/asm.h>

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#define ARCHRESOLVE(func) \

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	.globl CNAME(func); \

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	.type CNAME(func), @gnu_indirect_function; \

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	.set CNAME(func), __CONCAT(func,_resolver); \

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	ARCHENTRY(func, resolver); \

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	lea __CONCAT(func,_funcs)(%rip), %r8; \

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	jmp CNAME(__archlevel_resolve); \

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	ARCHEND(func, resolver)

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/*

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 * The func_funcs array stores the location of the implementations

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 * as the distance from the func_funcs array to the function.  Due

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 * to compiling for the medium code model, a 32 bit integer suffices

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 * to hold the distance.

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 *

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 * Doing it this way both saves storage and avoids giving rtld

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 * relocations to process at load time.

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 */

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#define ARCHFUNCS(func) \

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	ARCHRESOLVE(func); \

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	.section .rodata; \

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	.align 4; \

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	__CONCAT(func,_funcs):

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#define NOARCHFUNC \

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	.4byte 0

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#define ARCHFUNC(func, level) \

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	.4byte __CONCAT(__CONCAT(func,_),level) - __CONCAT(func,_funcs)

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#define ENDARCHFUNCS(func) \

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	.zero 4*(X86_64_MAX+1)-(.-__CONCAT(func,_funcs)); \

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	.size __CONCAT(func,_funcs), .-__CONCAT(func,_funcs)

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#define ARCHENTRY(func, level) \

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	_START_ENTRY; \

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	.type __CONCAT(__CONCAT(func,_),level), @function; \

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	__CONCAT(__CONCAT(func,_),level):; \

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	.cfi_startproc

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#define ARCHEND(func, level) \

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	END(__CONCAT(__CONCAT(func,_),level))

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#endif  /* __ASSEMBLER__ */

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