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diff --git a/lib/csu/Makefile.inc b/lib/csu/Makefile.inc
--- a/lib/csu/Makefile.inc
+++ b/lib/csu/Makefile.inc
@@ -20,7 +20,6 @@
ACFLAGS+= -DLOCORE
CFLAGS+= -DSTRIP_FBSDID
-CFLAGS+= -fno-asynchronous-unwind-tables
CFLAGS+= -fno-omit-frame-pointer
CFLAGS+= -I${.CURDIR:H}/common \
-I${SRCTOP}/lib/libc/include
@@ -35,25 +34,28 @@
# These FILES qualify as libraries for the purpose of LIBRARIES_ONLY.
.undef LIBRARIES_ONLY
+CRT1SRC?= crt1_c.c
+CRT1OBJ?=
+
CLEANFILES+= ${OBJS} ${CRT1OBJS} crt1_c.o gcrt1_c.o Scrt1_c.o
-CLEANFILES+= crti_s.o
+CLEANFILES+= crti_s.o ${CRT1SRC:C/.[S|c]$/.o/}
-crt1.o: crt1_c.o ${CRT1OBJS}
+crt1.o: ${CRT1SRC:C/.[S|c]$/.o/} ${CRT1OBJS} ${CRT1OBJ}
${LD} ${_LDFLAGS} -o ${.TARGET} -r ${.ALLSRC:M*.o}
.if ${MACHINE_ARCH} == "i386"
${OBJCOPY} --localize-symbol _start1 ${.TARGET}
.endif
-gcrt1_c.o: crt1_c.c
- ${CC} ${CFLAGS} -DGCRT -c -o ${.TARGET} ${.CURDIR}/crt1_c.c
+gcrt1_c.o: ${CRT1SRC}
+ ${CC} ${CFLAGS} -DGCRT -c -o ${.TARGET} ${.CURDIR}/${CRT1SRC}
-gcrt1.o: gcrt1_c.o ${CRT1OBJS}
+gcrt1.o: gcrt1_c.o ${CRT1OBJS} ${CRT1OBJ}
${LD} ${_LDFLAGS} -o ${.TARGET} -r ${.ALLSRC:M*.o}
-Scrt1_c.o: crt1_c.c
- ${CC} ${CFLAGS} -fPIC -DPIC -c -o ${.TARGET} ${.CURDIR}/crt1_c.c
+Scrt1_c.o: ${CRT1SRC}
+ ${CC} ${CFLAGS} -fPIC -DPIC -c -o ${.TARGET} ${.CURDIR}/${CRT1SRC}
-Scrt1.o: Scrt1_c.o ${CRT1OBJS}
+Scrt1.o: Scrt1_c.o ${CRT1OBJS} ${CRT1OBJ}
${LD} ${_LDFLAGS} -o ${.TARGET} -r ${.ALLSRC:M*.o}
.if ${MACHINE_ARCH} == "i386"
${OBJCOPY} --localize-symbol _start1 ${.TARGET}
diff --git a/lib/csu/amd64/Makefile b/lib/csu/amd64/Makefile
--- a/lib/csu/amd64/Makefile
+++ b/lib/csu/amd64/Makefile
@@ -5,4 +5,7 @@
CFLAGS+= -I${.CURDIR}
CFLAGS+= -fno-omit-frame-pointer
+CRT1SRC= crt1_s.S
+CRT1OBJ= crt1_c.o
+
.include <bsd.lib.mk>
diff --git a/lib/csu/amd64/crt1_c.c b/lib/csu/amd64/crt1_c.c
--- a/lib/csu/amd64/crt1_c.c
+++ b/lib/csu/amd64/crt1_c.c
@@ -29,26 +29,4 @@
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
-#include "libc_private.h"
#include "csu_common.h"
-
-void _start(char **, void (*)(void)) __dead2;
-
-/* The entry function. */
-void
-_start(char **ap, void (*cleanup)(void))
-{
- int argc;
- char **argv;
- char **env;
-
- argc = *(long *)(void *)ap;
- argv = ap + 1;
- env = ap + 2 + argc;
-#ifdef GCRT
- __libc_start1_gcrt(argc, argv, env, cleanup, main, &eprol, &etext);
-__asm__("eprol:");
-#else
- __libc_start1(argc, argv, env, cleanup, main);
-#endif
-}
diff --git a/lib/csu/amd64/crt1_s.S b/lib/csu/amd64/crt1_s.S
new file mode 100644
--- /dev/null
+++ b/lib/csu/amd64/crt1_s.S
@@ -0,0 +1,88 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (C) 2023 Dmitry Chagin <dchagin@FreeBSD.org>
+ *
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
+ */
+
+#include <machine/asm.h>
+
+
+ .text
+ .align 8
+
+ /*
+ * The program entry point
+ * %rdi %rsi
+ * void _start(char **ap, void (*cleanup)(void)) __dead2
+ */
+ .globl _start
+ .type _start, @function
+_start:
+ .cfi_startproc
+ .cfi_undefined %rip /* Terminate call chain. */
+ pushq %rbp /* Align stack, terminate call chain. */
+ .cfi_def_cfa_offset 8
+ movq %rsp, %rbp
+ .cfi_offset %rbp, -16
+ .cfi_def_cfa_register %rbp
+#ifdef GCRT
+ subq $16, %rsp
+#endif
+ movq %rsi, %rcx
+ movq %rdi, %rsi /* argv = ap */
+ addq $8, %rsi /* argv += 1 */
+ movq %rdi, %rdx /* env = ap */
+ addq $16, %rdx /* env += 2 */
+ movslq (%rdi), %rax
+ movl %eax, %edi /* argc = *(long *)(void *)ap */
+ shlq $3, %rax
+ addq %rax, %rdx /* env += argc */
+#ifdef PIC
+ /*
+ * XXX. %rip relative addressing does not intended to use in the
+ * large memory model due to offset from %rip is limited to 32 bits.
+ */
+ leaq main(%rip), %r8
+#else
+ movabsq $main, %r8
+#endif
+#ifdef GCRT
+ movabsq $eprol, %r9
+ movabsq $etext, %rax
+ movq %rax, (%rsp)
+ /*
+ * %edi %rsi %rdx %rcx %r8 %r9 (%rsp)
+ * __libc_start1_gcrt(argc, argv, env, cleanup, main, &eprol, &etext)
+ */
+ callq __libc_start1_gcrt
+eprol:
+#else
+ /* __libc_start1(argc, argv, env, cleanup, main) */
+ callq __libc_start1
+#endif
+ int3
+ .cfi_endproc
+ .size _start, . - _start
+
+ .section .note.GNU-stack,"",%progbits

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