diff --git a/src/support/END.h b/src/support/END.h
new file mode 100644
index 0000000000000..84e0dc6ceb9ad
--- /dev/null
+++ b/src/support/END.h
@@ -0,0 +1,55 @@
+/*-
+ * 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/i386/include/asm.h,v 1.14 2007/08/22 04:26:07 jkoshy Exp $
+ */
+
+#if defined(__linux__) || defined(__FreeBSD__) || defined(__ELF__)
+.size CNAME, . - CNAME
+#else
+#ifndef _MSC_VER
+.end
+#else
+CNAME endp
+end
+#endif
+#endif
+
+#undef CNAME
+#undef HIDENAME
+#undef STR
+#undef XSTR
+#undef _START_ENTRY
+#ifndef __APPLE__
+#undef EXT_
+#undef EXT
+#endif
diff --git a/src/support/ENTRY.amd64.h b/src/support/ENTRY.amd64.h
new file mode 100644
index 0000000000000..a3419e8e8c286
--- /dev/null
+++ b/src/support/ENTRY.amd64.h
@@ -0,0 +1,74 @@
+/*-
+ * 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 $
+ */
+
+#define _START_ENTRY .p2align 4,0x90
+#define STR(csym)           #csym
+#define XSTR(csym)          STR(csym)
+#if defined(__linux__) || defined(__FreeBSD__) || defined(__ELF__)
+#ifndef __APPLE__
+#define EXT_(csym)          csym
+#define EXT(csym)           EXT_(csym)
+#endif
+#define HIDENAME(asmsym)    .asmsym
+.text
+_START_ENTRY
+.globl EXT(CNAME)
+.type EXT(CNAME),@function
+EXT(CNAME):
+
+#elif defined(_WIN32)
+#define EXT_(csym)          csym
+#define EXT(csym)           EXT_(csym)
+#define HIDENAME(asmsym)    .asmsym
+
+#ifndef _MSC_VER
+.intel_syntax noprefix
+.text
+_START_ENTRY
+.globl EXT(CNAME)
+.section .drectve
+.ascii " -export:" XSTR(CNAME)
+.section .text
+.def EXT(CNAME)
+.scl 2
+.type 32
+.endef
+EXT(CNAME):
+#else
+.code
+CNAME proc
+#endif
+
+#endif
diff --git a/src/support/ENTRY.i387.h b/src/support/ENTRY.i387.h
new file mode 100644
index 0000000000000..6a808f728a1c1
--- /dev/null
+++ b/src/support/ENTRY.i387.h
@@ -0,0 +1,76 @@
+/*-
+ * 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/i386/include/asm.h,v 1.14 2007/08/22 04:26:07 jkoshy Exp $
+ */
+
+#define _START_ENTRY .p2align 2,0x90
+#define STR(csym)           #csym
+#define XSTR(csym)          STR(csym)
+#if defined(__linux__) || defined(__FreeBSD__) || defined(__ELF__)
+#ifndef __APPLE__
+#define EXT_(csym)          csym
+#define EXT(csym)           EXT_(csym)
+#endif
+#define HIDENAME(asmsym)    .asmsym
+.text
+_START_ENTRY
+.globl EXT(CNAME)
+.type EXT(CNAME),@function
+EXT(CNAME):
+
+#elif defined(_WIN32)
+#define EXT_(csym)          _##csym
+#define EXT(csym)           EXT_(csym)
+#define HIDENAME(asmsym)    .asmsym
+
+#ifndef _MSC_VER
+.intel_syntax
+.text
+_START_ENTRY
+.globl EXT(CNAME)
+.section .drectve
+.ascii " -export:" XSTR(CNAME)
+.section .text
+.def EXT(CNAME)
+.scl 2
+.type 32
+.endef
+EXT(CNAME):
+#else
+.586
+.model small,C
+.code
+CNAME proc
+#endif
+
+#endif
diff --git a/src/support/_longjmp.win32.S b/src/support/_longjmp.win32.S
index b96306fcdfe28..422a743422a7b 100644
--- a/src/support/_longjmp.win32.S
+++ b/src/support/_longjmp.win32.S
@@ -39,7 +39,6 @@
     RCSID("$NetBSD: _setjmp.S,v 1.8 2005/10/05 20:18:12 christos Exp $")
 #endif
 */
-#include "../../deps/openlibm/i387/bsd_asm.h"
 
 /*
  * C library -- _setjmp, _longjmp
@@ -51,15 +50,8 @@
  * The previous signal state is NOT restored.
  */
 
-#ifndef _MSC_VER
-.intel_syntax
-ENTRY(jl_longjmp)
-#else
-.586
-.model small,C
-.code
-jl_longjmp proc
-#endif
+#define CNAME jl_longjmp
+#include "ENTRY.i387.h"
     mov    edx,DWORD PTR [esp+4]
     mov    eax,DWORD PTR [esp+8]
     mov    ebp,DWORD PTR [edx+0]
@@ -73,7 +65,4 @@ jl_longjmp proc
     inc    eax
 a:  mov    DWORD PTR [esp],ecx
     ret
-#ifdef _MSC_VER
-jl_longjmp endp
-#endif
-END(jl_longjmp)
+#include "END.h"
diff --git a/src/support/_longjmp.win64.S b/src/support/_longjmp.win64.S
index e79e3044bac16..5bb17ea190586 100644
--- a/src/support/_longjmp.win64.S
+++ b/src/support/_longjmp.win64.S
@@ -1,12 +1,5 @@
-#include "../../deps/openlibm/amd64/bsd_asm.h"
-
-#ifndef _MSC_VER
-.intel_syntax noprefix
-ENTRY(jl_longjmp)
-#else
-.code
-jl_longjmp proc
-#endif
+#define CNAME jl_longjmp
+#include "ENTRY.amd64.h"
     mov    rbx,QWORD PTR [rcx+8]
     mov    rsp,QWORD PTR [rcx+16]
     mov    rbp,QWORD PTR [rcx+24]
@@ -33,7 +26,4 @@ jl_longjmp proc
     inc    eax
 a:  mov    QWORD PTR [rsp],r8
     ret
-#ifdef _MSC_VER
-jl_longjmp endp
-#endif
-END(jl_longjmp)
+#include "END.h"
diff --git a/src/support/_setjmp.win32.S b/src/support/_setjmp.win32.S
index b9190f77b6333..d3e6bba074733 100644
--- a/src/support/_setjmp.win32.S
+++ b/src/support/_setjmp.win32.S
@@ -39,7 +39,6 @@
     RCSID("$NetBSD: _setjmp.S,v 1.8 2005/10/05 20:18:12 christos Exp $")
 #endif
 */
-#include "../../deps/openlibm/i387/bsd_asm.h"
 
 /*
  * C library -- _setjmp, _longjmp
@@ -51,15 +50,8 @@
  * The previous signal state is NOT restored.
  */
 
-#ifndef _MSC_VER
-.intel_syntax
-ENTRY(jl_setjmp)
-#else
-.586
-.model small,C
-.code
-jl_setjmp proc
-#endif
+#define CNAME jl_setjmp
+#include "ENTRY.i387.h"
     mov    eax,DWORD PTR [esp+4]
     mov    edx,DWORD PTR [esp+0]
     mov    DWORD PTR [eax+0],ebp  /* rta */
@@ -70,7 +62,4 @@ jl_setjmp proc
     mov    DWORD PTR [eax+20],edx
     xor    eax,eax
     ret
-#ifdef _MSC_VER
-jl_setjmp endp
-#endif
-END(jl_setjmp)
+#include "END.h"
diff --git a/src/support/_setjmp.win64.S b/src/support/_setjmp.win64.S
index 547ff5144ef07..d490bae0b6d1f 100644
--- a/src/support/_setjmp.win64.S
+++ b/src/support/_setjmp.win64.S
@@ -1,12 +1,5 @@
-#include "../../deps/openlibm/amd64/bsd_asm.h"
-
-#ifndef _MSC_VER
-.intel_syntax noprefix
-ENTRY(jl_setjmp)
-#else
-.code
-jl_setjmp proc
-#endif
+#define CNAME jl_setjmp
+#include "ENTRY.amd64.h"
     mov    rdx,QWORD PTR [rsp]
     mov    QWORD PTR [rcx],0
     mov    QWORD PTR [rcx+8],rbx
@@ -32,7 +25,4 @@ jl_setjmp proc
     movaps XMMWORD PTR [rcx+240],xmm15
     xor    rax,rax
     ret
-#ifdef _MSC_VER
-jl_setjmp endp
-#endif
-END(jl_setjmp)
+#include "END.h"