/usr/include/openlibm/bsd_asm.h is in libopenlibm-dev 0.4+dfsg-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* William Jolitz.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* from: @(#)DEFS.h 5.1 (Berkeley) 4/23/90
* $FreeBSD: src/sys/amd64/include/asm.h,v 1.18 2007/08/22 04:26:07 jkoshy Exp $
*/
#ifndef _MACHINE_ASM_H_
#define _MACHINE_ASM_H_
#ifdef __APPLE__
#include "../i387/osx_asm.h"
#define CNAME(x) EXT(x)
#else
#include "bsd_cdefs.h"
#ifdef PIC
#define PIC_PLT(x) x@PLT
#define PIC_GOT(x) x@GOTPCREL(%rip)
#else
#define PIC_PLT(x) x
#define PIC_GOT(x) x
#endif
/*
* CNAME and HIDENAME manage the relationship between symbol names in C
* and the equivalent assembly language names. CNAME is given a name as
* it would be used in a C program. It expands to the equivalent assembly
* language name. HIDENAME is given an assembly-language name, and expands
* to a possibly-modified form that will be invisible to C programs.
*/
#define CNAME(csym) csym
#define HIDENAME(asmsym) .asmsym
#define _START_ENTRY .p2align 4,0x90
#if defined(__linux__) || defined(__FreeBSD__) || defined(__ELF__)
#define _ENTRY(x) .text; _START_ENTRY; \
.globl CNAME(x); .type CNAME(x),@function; CNAME(x):
#define END(x) .size x, . - x
#elif defined(_WIN32)
#ifndef _MSC_VER
#define END(x) .end
#define _START_ENTRY_WIN .text; _START_ENTRY
#else
#define END(x) end
#define _START_ENTRY_WIN .code; _START_ENTRY
#endif
#define _ENTRY(x) _START_ENTRY_WIN; \
.globl CNAME(x); .section .drectve; .ascii " -export:" #x; \
.section .text; .def CNAME(x); .scl 2; .type 32; .endef; CNAME(x):
#endif
#ifdef PROF
#define ALTENTRY(x) _ENTRY(x); \
pushq %rbp; movq %rsp,%rbp; \
call PIC_PLT(HIDENAME(mcount)); \
popq %rbp; \
jmp 9f
#define ENTRY(x) _ENTRY(x); \
pushq %rbp; movq %rsp,%rbp; \
call PIC_PLT(HIDENAME(mcount)); \
popq %rbp; \
9:
#else
#define ALTENTRY(x) _ENTRY(x)
#define ENTRY(x) _ENTRY(x)
#endif
#define RCSID(x) .text; .asciz x
#undef __FBSDID
#if !defined(lint) && !defined(STRIP_FBSDID)
#define __FBSDID(s) .ident s
#else
#define __FBSDID(s) /* nothing */
#endif /* not lint and not STRIP_FBSDID */
#endif
#endif /* !_MACHINE_ASM_H_ */
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