From bb7d94910088e463a1c4ebe257526bb570b55838 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Alex=20R=C3=B8nne=20Petersen?= <alex@alexrp.com>
Date: Mon, 1 Dec 2025 00:21:12 +0100
Subject: [PATCH] libc: add openbsd libc startup code for 7.8

---
 lib/libc/openbsd/lib/csu/aarch64/md_init.h   |  83 ++++++++++++
 lib/libc/openbsd/lib/csu/amd64/md_init.h     |  80 ++++++++++++
 lib/libc/openbsd/lib/csu/arm/md_init.h       | 112 ++++++++++++++++
 lib/libc/openbsd/lib/csu/crt0.c              |  76 +++++++++++
 lib/libc/openbsd/lib/csu/crtbegin.c          |  61 +++++++++
 lib/libc/openbsd/lib/csu/extern.h            |  54 ++++++++
 lib/libc/openbsd/lib/csu/i386/md_init.h      |  83 ++++++++++++
 lib/libc/openbsd/lib/csu/mips64/md_init.h    | 127 +++++++++++++++++++
 lib/libc/openbsd/lib/csu/os-note-elf.h       |  19 +++
 lib/libc/openbsd/lib/csu/powerpc/md_init.h   |  80 ++++++++++++
 lib/libc/openbsd/lib/csu/powerpc64/md_init.h |  75 +++++++++++
 lib/libc/openbsd/lib/csu/riscv64/md_init.h   |  74 +++++++++++
 lib/libc/openbsd/lib/csu/sparc64/md_init.h   |  85 +++++++++++++
 13 files changed, 1009 insertions(+)
 create mode 100644 lib/libc/openbsd/lib/csu/aarch64/md_init.h
 create mode 100644 lib/libc/openbsd/lib/csu/amd64/md_init.h
 create mode 100644 lib/libc/openbsd/lib/csu/arm/md_init.h
 create mode 100644 lib/libc/openbsd/lib/csu/crt0.c
 create mode 100644 lib/libc/openbsd/lib/csu/crtbegin.c
 create mode 100644 lib/libc/openbsd/lib/csu/extern.h
 create mode 100644 lib/libc/openbsd/lib/csu/i386/md_init.h
 create mode 100644 lib/libc/openbsd/lib/csu/mips64/md_init.h
 create mode 100644 lib/libc/openbsd/lib/csu/os-note-elf.h
 create mode 100644 lib/libc/openbsd/lib/csu/powerpc/md_init.h
 create mode 100644 lib/libc/openbsd/lib/csu/powerpc64/md_init.h
 create mode 100644 lib/libc/openbsd/lib/csu/riscv64/md_init.h
 create mode 100644 lib/libc/openbsd/lib/csu/sparc64/md_init.h

diff --git a/lib/libc/openbsd/lib/csu/aarch64/md_init.h b/lib/libc/openbsd/lib/csu/aarch64/md_init.h
new file mode 100644
index 0000000000..70a4d9103d
--- /dev/null
+++ b/lib/libc/openbsd/lib/csu/aarch64/md_init.h
@@ -0,0 +1,83 @@
+/* $OpenBSD: md_init.h,v 1.12 2023/11/18 16:26:16 deraadt Exp $ */
+
+/*-
+ * Copyright (c) 2001 Ross Harvey
+ * All rights reserved.
+ * 
+ * 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.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *      This product includes software developed by the NetBSD
+ *      Foundation, Inc. and its contributors.
+ * 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
+ */
+
+#define MD_SECT_CALL_FUNC(section, func) \
+	__asm (".section "#section", \"ax\"		\n" \
+	"	bl " #func "				\n" \
+	"	.previous")
+
+#define MD_SECTION_PROLOGUE(sect, entry_pt)	\
+	__asm (					\
+	".section "#sect",\"ax\",%progbits	\n" \
+	"	.globl " #entry_pt "		\n" \
+	"	.type " #entry_pt ",%function	\n" \
+	"	.align 4			\n" \
+	#entry_pt":				\n" \
+	"	bti	c			\n" \
+	"	sub	sp, sp, #16		\n" \
+	"	str	lr, [sp]		\n" \
+	"	/* fall thru */			\n" \
+	"	.previous")
+
+
+#define MD_SECTION_EPILOGUE(sect)		\
+	__asm (					\
+	".section "#sect",\"ax\",%progbits	\n" \
+	"	ldr	lr, [sp]		\n" \
+	"	add	sp, sp, #16		\n" \
+	"	ret				\n" \
+	"	.previous")
+
+
+#define	MD_CRT0_START				\
+	__asm(					\
+	".text					\n" \
+	"	.align	0			\n" \
+	"	.globl	_start			\n" \
+	"	.globl	__start			\n" \
+	"_start:				\n" \
+	"__start:				\n" \
+	"	bti	c			\n" \
+	"	mov	x3, x2	/* cleanup */	\n" \
+	"/* Get argc/argv/envp from stack */	\n" \
+	"	ldr	x0, [sp]		\n" \
+	"	add	x1, sp, #0x0008		\n" \
+	"	add	x2, x1, x0, lsl #3	\n" \
+	"	add	x2, x2, #0x0008		\n" \
+	"					\n" \
+	"	b	___start		\n" \
+	".previous");
+
+/* zig patch: no static crt support */
diff --git a/lib/libc/openbsd/lib/csu/amd64/md_init.h b/lib/libc/openbsd/lib/csu/amd64/md_init.h
new file mode 100644
index 0000000000..3b41a93b54
--- /dev/null
+++ b/lib/libc/openbsd/lib/csu/amd64/md_init.h
@@ -0,0 +1,80 @@
+/* $OpenBSD: md_init.h,v 1.11 2023/11/18 16:26:16 deraadt Exp $ */
+
+/*-
+ * Copyright (c) 2001 Ross Harvey
+ * All rights reserved.
+ * 
+ * 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.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *      This product includes software developed by the NetBSD
+ *      Foundation, Inc. and its contributors.
+ * 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
+ */
+
+#define MD_SECT_CALL_FUNC(section, func) \
+	__asm (".section "#section", \"ax\"\n"	\
+	"	call " #func "\n"		\
+	"	.previous")
+
+#define MD_SECTION_PROLOGUE(sect, entry_pt)	\
+	__asm (					\
+	".section "#sect",\"ax\",@progbits	\n" \
+	"	.globl " #entry_pt "		\n" \
+	"	.type " #entry_pt ",@function	\n" \
+	"	.align 16			\n" \
+	#entry_pt":				\n" \
+	"	endbr64				\n" \
+	"	subq	$8,%rsp			\n" \
+	"	.previous")
+
+
+#define MD_SECTION_EPILOGUE(sect)		\
+	__asm (					\
+	".section "#sect",\"ax\",@progbits	\n" \
+	"	addq	$8,%rsp			\n" \
+	"	ret				\n" \
+	"	.previous")
+
+
+#define	MD_CRT0_START				\
+	__asm(					\
+	".text					\n" \
+	"	.align	8			\n" \
+	"	.globl	__start			\n" \
+	"	.globl	_start			\n" \
+	"_start:				\n" \
+	"__start:				\n" \
+	"	endbr64				\n" \
+	"	movq	%rdx,%rcx		\n" \
+	"	movq	(%rsp),%rdi		\n" \
+	"	leaq	16(%rsp,%rdi,8),%rdx	\n" \
+	"	leaq	8(%rsp),%rsi		\n" \
+	"	subq	$8,%rsp			\n" \
+	"	andq	$~15,%rsp		\n" \
+	"	addq	$8,%rsp			\n" \
+	"	jmp	___start		\n" \
+	"	.previous")
+
+/* zig patch: no static crt support */
diff --git a/lib/libc/openbsd/lib/csu/arm/md_init.h b/lib/libc/openbsd/lib/csu/arm/md_init.h
new file mode 100644
index 0000000000..6865105512
--- /dev/null
+++ b/lib/libc/openbsd/lib/csu/arm/md_init.h
@@ -0,0 +1,112 @@
+/* $OpenBSD: md_init.h,v 1.19 2024/08/17 09:48:31 phessler Exp $ */
+
+/*-
+ * Copyright (c) 2001 Ross Harvey
+ * All rights reserved.
+ * 
+ * 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.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *      This product includes software developed by the NetBSD
+ *      Foundation, Inc. and its contributors.
+ * 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
+ */
+
+/*
+ * arm overrides these because it uses %progbits instead of @progbits
+ */
+#define MD_DATA_SECTION_FLAGS_SYMBOL(section, flags, type, symbol)	\
+	extern __dso_hidden type symbol[];				\
+	__asm("	.section "section",\""flags"\",%progbits		\n" \
+	"	.balign 4						\n" \
+	#symbol":							\n" \
+	"	.previous")
+#define MD_DATA_SECTION_SYMBOL_VALUE(section, type, symbol, value)	\
+	extern __dso_hidden type symbol[];				\
+	__asm("	.section "section",\"aw\",%progbits			\n" \
+	"	.balign 4						\n" \
+	#symbol":							\n" \
+	"	.int "#value"						\n" \
+	"	.previous")
+#define MD_DATA_SECTION_FLAGS_VALUE(section, flags, value)		\
+	__asm("	.section "section",\""flags"\",%progbits		\n" \
+	"	.balign 4						\n" \
+	"	.int "#value"						\n" \
+	"	.previous")
+
+#define MD_SECT_CALL_FUNC(section, func) \
+	__asm (".section "#section", \"ax\"		\n" \
+	"	movw	r0, #:lower16:" #func "- 1f - 8	\n" \
+	"	movt	r0, #:upper16:" #func "- 1f - 8	\n" \
+	"1:	add	r0, r0, pc			\n" \
+	"	blx	r0				\n" \
+	"	.previous")
+
+#define MD_SECTION_PROLOGUE(sect, entry_pt)	\
+	__asm (					\
+	".section "#sect",\"ax\",%progbits	\n" \
+	"	.globl " #entry_pt "		\n" \
+	"	.type " #entry_pt ",%function	\n" \
+	"	.align 4			\n" \
+	#entry_pt":				\n" \
+	"	push	{r4, lr}		\n" \
+	"	/* fall thru */			\n" \
+	"	.previous")
+
+
+#define MD_SECTION_EPILOGUE(sect)		\
+	__asm (					\
+	".section "#sect",\"ax\",%progbits	\n" \
+	"	pop	{r4, pc}		\n" \
+	"	.previous")
+
+
+/*
+ * The definitions of environ and __progname prevent the creation
+ * of COPY relocations for WEAK symbols.
+ */
+#define	MD_CRT0_START				\
+	__asm(					\
+	".text					\n" \
+	"	.align	0			\n" \
+	"	.globl	_start			\n" \
+	"	.globl	__start			\n" \
+	"_start:				\n" \
+	"__start:				\n" \
+	"	mov	r3, r0	/* cleanup */	\n" \
+	"/* Get argc/argv/envp from stack */	\n" \
+	"	ldr	r0, [sp, #0]		\n" \
+	"	add	r1, sp, #4		\n" \
+	"	add	r2, r1, r0, lsl #2	\n" \
+	"	add	r2, r2, #4		\n" \
+	"					\n" \
+	"/*					\n" \
+	" * Ensure the stack is properly	\n" \
+	" * aligned before calling C code.	\n" \
+	" */					\n" \
+	"	bic	sp, sp, #7" /*__STRING(STACKALIGNBYTES)*/ "	\n" \
+	"	b	___start		\n" \
+	".previous");
+
+/* zig patch: no static crt support */
diff --git a/lib/libc/openbsd/lib/csu/crt0.c b/lib/libc/openbsd/lib/csu/crt0.c
new file mode 100644
index 0000000000..938a707bce
--- /dev/null
+++ b/lib/libc/openbsd/lib/csu/crt0.c
@@ -0,0 +1,76 @@
+/*	$OpenBSD: crt0.c,v 1.19 2025/05/24 06:32:12 deraadt Exp $	*/
+
+/*
+ * Copyright (c) 1995 Christopher G. Demetriou
+ * All rights reserved.
+ *
+ * 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.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *      This product includes software developed by Christopher G. Demetriou
+ *	for the NetBSD Project.
+ * 4. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
+ */
+
+#include <sys/syscall.h>
+#include <stdlib.h>
+#include <limits.h>
+
+#include "md_init.h"
+/* zig patch: no static crt support */
+#include "extern.h"
+
+#define STR(x) __STRING(x)	/* shorter macro name for MD_RCRT0_START */
+
+/* some defaults */
+#ifndef	MD_START_ARGS
+#define	MD_START_ARGS	\
+	int argc, char **argv, char **envp, void (*cleanup)(void)
+#endif
+static void		___start(MD_START_ARGS) __used;
+#ifndef	MD_EPROL_LABEL
+#define	MD_EPROL_LABEL	__asm("  .text\n_eprol:")
+#endif
+
+char	***_csu_finish(char **_argv, char **_envp, void (*_cleanup)(void));
+
+/* zig patch: no profiling support */
+
+#ifdef MD_CRT0_START
+MD_CRT0_START;
+#endif
+
+/* zig patch: no legacy leanup abi support */
+
+static void
+___start(MD_START_ARGS)
+{
+	size_t size, i;
+	char ***environp;
+#ifdef MD_START_SETUP
+	MD_START_SETUP
+#endif
+
+	environp = _csu_finish(argv, envp, cleanup);
+
+	exit(main(argc, argv, *environp));
+}
diff --git a/lib/libc/openbsd/lib/csu/crtbegin.c b/lib/libc/openbsd/lib/csu/crtbegin.c
new file mode 100644
index 0000000000..4ef3062a61
--- /dev/null
+++ b/lib/libc/openbsd/lib/csu/crtbegin.c
@@ -0,0 +1,61 @@
+/*	$OpenBSD: crtbegin.c,v 1.26 2019/01/09 16:42:38 visa Exp $	*/
+/*	$NetBSD: crtbegin.c,v 1.1 1996/09/12 16:59:03 cgd Exp $	*/
+
+/*
+ * Copyright (c) 1993 Paul Kranenburg
+ * All rights reserved.
+ *
+ * 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.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *      This product includes software developed by Paul Kranenburg.
+ * 4. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
+ */
+
+/*
+ * Run-time module for GNU C++ compiled shared libraries.
+ *
+ * The linker constructs the following arrays of pointers to global
+ * constructors and destructors. The first element contains the
+ * number of pointers in each.
+ * The tables are also null-terminated.
+ */
+#include <stdlib.h>
+
+#include "md_init.h"
+#include "os-note-elf.h"
+#include "extern.h"
+
+/* zig patch: no ctors/dtors and init/fini */
+
+/*
+ * Include support for the __cxa_atexit/__cxa_finalize C++ abi for
+ * gcc > 2.x. __dso_handle is NULL in the main program and a unique
+ * value for each C++ shared library. For more info on this API, see:
+ *
+ *     http://www.codesourcery.com/cxx-abi/abi.html#dso-dtor
+ */
+
+void *__dso_handle = NULL;
+__asm(".hidden  __dso_handle");
+
+long __guard_local __dso_hidden __attribute__((section(".openbsd.randomdata")));
diff --git a/lib/libc/openbsd/lib/csu/extern.h b/lib/libc/openbsd/lib/csu/extern.h
new file mode 100644
index 0000000000..92dc12a043
--- /dev/null
+++ b/lib/libc/openbsd/lib/csu/extern.h
@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) 2004 Marc Espie <espie@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+void	__init(void) __dso_hidden;
+int	main(int argc, char *argv[], char *envp[]);
+
+typedef const void *dl_cb_cb(int);
+typedef void (*initarray_f)(int, char **, char **, dl_cb_cb *);
+typedef void (*init_f)(void);
+
+/*
+ * Provide default implementations of these.  Only archs with weird
+ * ASM stuff (hppa, arm) need to override them
+ */
+#ifndef MD_DATA_SECTION_FLAGS_SYMBOL
+# ifdef __LP64__
+#  define VALUE_ALIGN		".balign 8"
+#  define VALUE_DIRECTIVE	".quad"
+# else
+#  define VALUE_ALIGN		".balign 4"
+#  define VALUE_DIRECTIVE	".int"
+# endif
+# define MD_DATA_SECTION_FLAGS_SYMBOL(section, flags, type, symbol)	\
+	extern __dso_hidden type symbol[];				\
+	__asm("	.section "section",\""flags"\",@progbits		\n" \
+	"	"VALUE_ALIGN"						\n" \
+	#symbol":							\n" \
+	"	.previous")
+# define MD_DATA_SECTION_SYMBOL_VALUE(section, type, symbol, value)	\
+	extern __dso_hidden type symbol[];				\
+	__asm("	.section "section",\"aw\",@progbits			\n" \
+	"	"VALUE_ALIGN"						\n" \
+	#symbol":							\n" \
+	"	"VALUE_DIRECTIVE" "#value"				\n" \
+	"	.previous")
+# define MD_DATA_SECTION_FLAGS_VALUE(section, flags, value)		\
+	__asm("	.section "section",\""flags"\",@progbits		\n" \
+	"	"VALUE_ALIGN"						\n" \
+	"	"VALUE_DIRECTIVE" "#value"				\n" \
+	"	.previous")
+#endif
diff --git a/lib/libc/openbsd/lib/csu/i386/md_init.h b/lib/libc/openbsd/lib/csu/i386/md_init.h
new file mode 100644
index 0000000000..fd6fa64e4d
--- /dev/null
+++ b/lib/libc/openbsd/lib/csu/i386/md_init.h
@@ -0,0 +1,83 @@
+/* $OpenBSD: md_init.h,v 1.13 2023/11/18 16:26:16 deraadt Exp $ */
+
+/*-
+ * Copyright (c) 2001 Ross Harvey
+ * All rights reserved.
+ * 
+ * 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.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *      This product includes software developed by the NetBSD
+ *      Foundation, Inc. and its contributors.
+ * 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
+ */
+
+#define MD_SECT_CALL_FUNC(section, func) \
+	__asm (".section "#section", \"ax\"\n"	\
+	"	call " #func "\n"		\
+	"	.previous")
+
+#define MD_SECTION_PROLOGUE(sect, entry_pt)	\
+	__asm (					\
+	".section "#sect",\"ax\",@progbits	\n" \
+	"	.globl " #entry_pt "		\n" \
+	"	.type " #entry_pt ",@function	\n" \
+	"	.align 16			\n" \
+	#entry_pt":				\n" \
+	"	pushl	%ebp			\n" \
+	"	movl	%esp,%ebp		\n" \
+	"	andl	$~15,%esp		\n" \
+	"	.previous")
+
+
+#define MD_SECTION_EPILOGUE(sect)		\
+	__asm (					\
+	".section "#sect",\"ax\",@progbits	\n" \
+	"	leave				\n" \
+	"	ret				\n" \
+	"	.previous")
+
+
+#define	MD_CRT0_START				\
+	__asm(					\
+	".text					\n" \
+	"	.align	4			\n" \
+	"	.globl	__start			\n" \
+	"	.globl	_start			\n" \
+	"_start:				\n" \
+	"__start:				\n" \
+	"	movl	%esp,%ebp		\n" \
+	"	andl	$~15,%esp	# align stack\n" \
+	"	pushl	%edx		# cleanup\n" \
+	"	movl	0(%ebp),%eax		\n" \
+	"	leal	8(%ebp,%eax,4),%ecx	\n" \
+	"	leal	4(%ebp),%edx		\n" \
+	"	pushl	%ecx			\n" \
+	"	pushl	%edx			\n" \
+	"	pushl	%eax			\n" \
+	"	xorl	%ebp,%ebp	# mark deepest stack frame\n" \
+	"	call	___start		\n" \
+	"	.previous")
+
+/* zig patch: no static crt support */
diff --git a/lib/libc/openbsd/lib/csu/mips64/md_init.h b/lib/libc/openbsd/lib/csu/mips64/md_init.h
new file mode 100644
index 0000000000..a20c1ad37c
--- /dev/null
+++ b/lib/libc/openbsd/lib/csu/mips64/md_init.h
@@ -0,0 +1,127 @@
+/* $OpenBSD: md_init.h,v 1.22 2023/11/19 00:46:54 deraadt Exp $ */
+
+/*-
+ * Copyright (c) 2001 Ross Harvey
+ * Copyright (c) 2001 Simon Burge
+ * All rights reserved.
+ * 
+ * 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.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *      This product includes software developed by the NetBSD
+ *      Foundation, Inc. and its contributors.
+ * 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
+ */
+
+/*
+ * Allocate 32 bytes for the stack frame.  Store GP at SP+16 (since
+ * this is where code generated by the compiler for fallthru processing
+ * expects it to be), and the RA at SP+24.
+ */
+
+/* this is gross... */
+
+#ifdef __ABICALLS__
+#define MD_FUNCTION_PROLOGUE(entry_pt)			\
+	"	.frame $sp,32,$31		\n"	\
+	"	.set	reorder			\n"	\
+	"	dsubu    $sp,$sp,32		\n"	\
+	"	.cpsetup $25, 16, "#entry_pt"	\n"	\
+	"	sd      $ra ,24($sp)		\n"
+#else
+#define MD_FUNCTION_PROLOGUE(entry_pt)			\
+	"       dsubu	$sp,$sp,32		\n"	\
+	"       sd	$ra ,24($sp)		\n"
+#endif
+
+
+#define MD_SECTION_PROLOGUE(sect, entry_pt)		\
+	__asm (						\
+	".section "#sect",\"ax\",@progbits	\n"	\
+	".align 2				\n"	\
+	".globl "#entry_pt"			\n"	\
+	".type "#entry_pt",@function		\n"	\
+	".ent "#entry_pt"			\n"	\
+	#entry_pt":				\n"	\
+	MD_FUNCTION_PROLOGUE(entry_pt)			\
+	"       /* fall thru */			\n"	\
+	".end "#entry_pt"			\n"	\
+	".previous")
+
+#define MD_SECTION_EPILOGUE(sect)                       \
+	__asm (						\
+	".section "#sect",\"ax\",@progbits      \n"	\
+	"	ld	$ra ,24($sp)		\n"	\
+	" # next should have been a .cpreturn 	\n"	\
+	"	ld	$gp,16($sp)		\n"	\
+	"	.set	noreorder		\n"	\
+	"	j	$ra			\n"	\
+	"	daddu	$sp,$sp,32		\n"	\
+	"	.set	reorder			\n"	\
+	".previous")
+
+#define MD_SECT_CALL_FUNC(section, func)		\
+	__asm (".section "#section", \"ax\"	\n"	\
+	"	.local	" #func "		\n"	\
+	"	jal	" #func "		\n"	\
+	".previous")
+
+#define MD_CRT0_START				\
+	__asm(					\
+	".text					\n" \
+	"	.align	3			\n" \
+	"	.globl	__start			\n" \
+	"	.ent	__start			\n" \
+	"	.type	__start, @function	\n" \
+	"__start:				\n" \
+	"	lui	$gp, %hi(%neg(%gp_rel(__start)))	\n" \
+	"	addiu	$gp, $gp, %lo(%neg(%gp_rel(__start)))	\n" \
+	"	daddu	$gp, $gp, $t9		\n" \
+	"	move	$a0, $sp		\n" \
+	"	dsrl	$a1, $sp, 4		\n" /* align stack on a */ \
+	"	dsll	$sp, $a1, 4		\n" /* 16 byte boundary */ \
+	"	move	$a1, $v0		\n" \
+	"	.local	___start		\n" \
+	"	dla	$t9, ___start		\n" \
+	"	jr	$t9			\n" \
+	"	.end	__start			\n" \
+	"	.previous")
+
+/* zig patch: no static crt support */
+
+struct kframe {
+	long	kargc;
+	char	*kargv[1];	/* size depends on kargc */
+	char	kargstr[1];	/* size varies */
+	char	kenvstr[1];	/* size varies */
+};
+
+#define	MD_START_ARGS		struct kframe *kfp, void (*cleanup)(void)
+#define	MD_START_SETUP				\
+	char	**argv, **envp;			\
+	long	argc;				\
+						\
+	argc = kfp->kargc;			\
+	argv = &kfp->kargv[0];			\
+	envp = argv + argc + 1;
diff --git a/lib/libc/openbsd/lib/csu/os-note-elf.h b/lib/libc/openbsd/lib/csu/os-note-elf.h
new file mode 100644
index 0000000000..48e33f22eb
--- /dev/null
+++ b/lib/libc/openbsd/lib/csu/os-note-elf.h
@@ -0,0 +1,19 @@
+/*	$OpenBSD: os-note-elf.h,v 1.5 2009/03/06 23:13:40 kurt Exp $	*/
+/*
+ * Contents:
+ *
+ *  long Name length
+ *  long Description length
+ *  long ELF_NOTE_TYPE_OSVERSION (1) XXX - need a define.
+ *  "OpenBSD\0"
+ *  version? 0 XXX
+ */
+
+__asm("	.section \".note.openbsd.ident\", \"a\"\n"
+"	.p2align 2\n"
+"	.long	8\n"
+"	.long	4\n"
+"	.long	1\n"
+"	.ascii \"OpenBSD\\0\"\n"
+"	.long	0\n"
+"	.previous\n");
diff --git a/lib/libc/openbsd/lib/csu/powerpc/md_init.h b/lib/libc/openbsd/lib/csu/powerpc/md_init.h
new file mode 100644
index 0000000000..933e2ee115
--- /dev/null
+++ b/lib/libc/openbsd/lib/csu/powerpc/md_init.h
@@ -0,0 +1,80 @@
+/* $OpenBSD: md_init.h,v 1.12 2023/11/18 16:26:16 deraadt Exp $ */
+
+/*-
+ * Copyright (c) 2001 Ross Harvey
+ * All rights reserved.
+ * 
+ * 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.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *      This product includes software developed by the NetBSD
+ *      Foundation, Inc. and its contributors.
+ * 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
+ */
+
+#define MD_SECT_CALL_FUNC(section, func) \
+	__asm (".section "#section", \"ax\"\n"	\
+	"	bl " #func "\n"		\
+	"	.previous")
+
+#define MD_SECTION_PROLOGUE(sect, entry_pt)	\
+	__asm (					\
+	".section "#sect",\"ax\",@progbits	\n" \
+	"	.globl " #entry_pt "		\n" \
+	"	.type " #entry_pt ",@function	\n" \
+	"	.align 4			\n" \
+	#entry_pt":				\n" \
+	"	stwu	%r1,-16(%r1)		\n" \
+	"	mflr	%r0			\n" \
+	"	stw	%r0,12(%r1)		\n" \
+	"	/* fall thru */			\n" \
+	"	.previous")
+
+
+#define MD_SECTION_EPILOGUE(sect)		\
+	__asm (					\
+	".section "#sect",\"ax\",@progbits	\n" \
+	"	lwz	%r0,12(%r1)		\n" \
+	"	mtlr	%r0			\n" \
+	"	addi	%r1,%r1,16		\n" \
+	"	blr				\n" \
+	"	.previous")
+
+#define	MD_CRT0_START							\
+__asm(									\
+"	.text								\n" \
+"	.section	\".text\"					\n" \
+"	.align 2							\n" \
+"	.globl	_start							\n" \
+"	.type	_start, @function					\n" \
+"	.globl	__start							\n" \
+"	.type	__start, @function					\n" \
+"_start:								\n" \
+"__start:								\n" \
+"	# put cleanup in r6 instead of r7				\n" \
+"	mr %r6, %r7							\n" \
+"	b ___start							\n" \
+)
+
+/* zig patch: no static crt support */
diff --git a/lib/libc/openbsd/lib/csu/powerpc64/md_init.h b/lib/libc/openbsd/lib/csu/powerpc64/md_init.h
new file mode 100644
index 0000000000..1ede168fc1
--- /dev/null
+++ b/lib/libc/openbsd/lib/csu/powerpc64/md_init.h
@@ -0,0 +1,75 @@
+/* $OpenBSD: md_init.h,v 1.5 2023/11/18 16:26:16 deraadt Exp $ */
+
+/*
+ * Copyright (c) 2020 Dale Rahn <drahn@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#define MD_SECT_CALL_FUNC(section, func)				\
+	__asm (".section "#section", \"ax\"				\n" \
+	"	bl " #func "						\n" \
+	"	.previous")
+
+#define MD_SECTION_PROLOGUE(sect, entry_pt)				\
+	__asm (								\
+	".section "#sect",\"ax\",@progbits				\n" \
+	"	.globl " #entry_pt "					\n" \
+	"	.type " #entry_pt ",@function				\n" \
+	"	.align 4						\n" \
+	#entry_pt":							\n" \
+	".L_"sect"_gep:							\n" \
+	"	addis %r2, %r12, .TOC.-.L_"sect"_gep@ha			\n" \
+	"	addi %r2, %r2, .TOC.-.L_"sect"_gep@l			\n" \
+	".L_"sect"_lep:							\n" \
+	"	.localentry " #entry_pt", .L_"sect"_lep-.L_"sect"_gep;	\n" \
+	"	mflr	%r0						\n" \
+	"	std	%r0,16(%r1)					\n" \
+	"	stdu	%r1,-64(%r1)					\n" \
+	"	/* fall thru */						\n" \
+	"	.previous")
+
+
+#define MD_SECTION_EPILOGUE(sect)					\
+	__asm (								\
+	".section "#sect",\"ax\",@progbits				\n" \
+	"	addi	%r1,%r1,64					\n" \
+	"	ld	%r0,16(%r1)					\n" \
+	"	mtlr	%r0						\n" \
+	"	blr							\n" \
+	"	.previous")
+
+#define	MD_CRT0_START							\
+__asm(									\
+"	.text								\n" \
+"	.section	\".text\"					\n" \
+"	.align 2							\n" \
+"	.globl	_start							\n" \
+"	.type	_start, @function					\n" \
+"	.globl	__start							\n" \
+"	.type	__start, @function					\n" \
+"_start:								\n" \
+"__start:								\n" \
+"	bl	1f							\n" \
+"1:									\n" \
+"	mflr	%r30							\n" \
+"	addis	%r2, %r30, .TOC.-1b@ha					\n" \
+"	addi	%r2, %r2, .TOC.-1b@l					\n" \
+"	# put cleanup in r6 instead of r7				\n" \
+"	mr	%r6, %r7						\n" \
+"	li	%r7, 0							\n" \
+"	stdu	%r7, -64(%r1)						\n" \
+"	b ___start							\n" \
+)
+
+/* zig patch: no static crt support */
diff --git a/lib/libc/openbsd/lib/csu/riscv64/md_init.h b/lib/libc/openbsd/lib/csu/riscv64/md_init.h
new file mode 100644
index 0000000000..99fd091399
--- /dev/null
+++ b/lib/libc/openbsd/lib/csu/riscv64/md_init.h
@@ -0,0 +1,74 @@
+/* $OpenBSD: md_init.h,v 1.4 2023/11/18 16:26:16 deraadt Exp $ */
+/*
+ * Copyright (c) 2020 Dale Rahn <drahn@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#define MD_SECT_CALL_FUNC(section, func) 				\
+	__asm (".section "#section", \"ax\"				\n" \
+	"call " # func "@plt 						\n" \
+	"	.previous")
+
+#define MD_SECTION_PROLOGUE(sect, entry_pt)				\
+	__asm (								\
+	".section "#sect",\"ax\",%progbits				\n" \
+	"	.globl " #entry_pt "					\n" \
+	"	.type " #entry_pt ",@function				\n" \
+	"	.align 4						\n" \
+	#entry_pt":							\n" \
+	"	addi	sp, sp, -16					\n" \
+	"	sd	ra,8(sp)					\n" \
+	"	sd	s0,0(sp)					\n" \
+	"	addi	s0, sp, 16					\n" \
+	"	/* fall thru */						\n" \
+	"	.previous")
+
+
+#define MD_SECTION_EPILOGUE(sect)					\
+	__asm (								\
+	".section "#sect",\"ax\",%progbits				\n" \
+	"	ld	ra, 8(sp)					\n" \
+	"	ld	s0, 0(sp)					\n" \
+	"	addi	sp, sp, 16					\n" \
+	"	jr	ra						\n" \
+	"	.previous")
+
+
+#define	MD_CRT0_START							\
+	__asm(								\
+	".text								\n" \
+	"	.align	0						\n" \
+	"	.globl	_start						\n" \
+	"	.globl	__start						\n" \
+	"	.type	_start, @function				\n" \
+	"	.type	__start, @function				\n" \
+	"_start:							\n" \
+	"__start:							\n" \
+	"/* Get argc/argv/envp from stack */				\n" \
+	"	ld	a0, (sp)					\n" \
+	"	addi	a1, sp, 0x8					\n" \
+	"	slli	t0, a0, 0x3					\n" \
+	"	add	a2, a1, t0					\n" \
+	"	addi	a2, a2, 0x8					\n" \
+	"								\n" \
+	"	addi	sp, sp, -16					\n" \
+	"	li	t0, 0						\n" \
+	"	sd	t0,(sp)						\n" \
+	"								\n" \
+	"	j	___start					\n" \
+	"	.size	_start, .-_start				\n" \
+	"	.size	__start, .-__start				\n" \
+	".previous");
+
+/* zig patch: no static crt support */
diff --git a/lib/libc/openbsd/lib/csu/sparc64/md_init.h b/lib/libc/openbsd/lib/csu/sparc64/md_init.h
new file mode 100644
index 0000000000..e46806831f
--- /dev/null
+++ b/lib/libc/openbsd/lib/csu/sparc64/md_init.h
@@ -0,0 +1,85 @@
+/* $OpenBSD: md_init.h,v 1.11 2025/01/30 21:41:37 kurt Exp $ */
+
+/*-
+ * Copyright (c) 2001 Ross Harvey
+ * All rights reserved.
+ * 
+ * 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.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *      This product includes software developed by the NetBSD
+ *      Foundation, Inc. and its contributors.
+ * 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
+ */
+
+#define MD_SECT_CALL_FUNC(section, func) \
+	__asm (".section "#section", \"ax\"	\n" \
+	"	call " #func "			\n" \
+	"	 nop				\n" \
+	"	.previous")
+
+#define MD_SECTION_PROLOGUE(sect, entry_pt)	\
+	__asm (					\
+	".section "#sect",\"ax\",@progbits	\n" \
+	"	.globl " #entry_pt "		\n" \
+	"	.type " #entry_pt ",@function	\n" \
+	#entry_pt":				\n" \
+	"	save	%sp, -192, %sp		\n" \
+	"	.align 4			\n" \
+	"	/* fall thru */			\n" \
+	"	.previous")
+
+
+#define MD_SECTION_EPILOGUE(sect)		\
+	__asm (					\
+	".section "#sect",\"ax\",@progbits	\n" \
+	"	ret				\n" \
+	"	 restore			\n" \
+	"	.previous")
+
+
+#define	MD_CRT0_START				\
+	__asm__(				\
+	".text					\n" \
+	"	.align	4			\n" \
+	"	.global	_start			\n" \
+	"	.global	__start			\n" \
+	"_start:				\n" \
+	"__start:				\n" \
+	"	clr	%fp			\n" \
+	"	add	%sp, 2175, %o0	/* stack */\n" \
+	"	ba,pt	%icc, ___start		\n" \
+	"	 mov	%g1, %o1		\n" \
+	"	.previous")
+
+/* zig patch: no static crt support */
+
+#define	MD_START_ARGS		char **sp, void (*cleanup)(void)
+#define	MD_START_SETUP				\
+	char **argv, **envp;			\
+	long argc;				\
+						\
+	argc = *(long *)sp;			\
+	argv = sp + 1;				\
+	envp = sp + 2 + argc;		/* 2: argc + NULL ending argv */