16 files changed, 568 insertions, 0 deletions

diff --git a/lib/libc/csu/Makefile.inc b/lib/libc/csu/Makefile.inc
new file mode 100644
index 000000000000..666744f27c8b
--- /dev/null
+++ b/lib/libc/csu/Makefile.inc
@@ -0,0 +1,10 @@
+#
+
+.PATH: ${LIBC_SRCTOP}/csu
+.include "${LIBC_SRCTOP}/csu/${LIBC_ARCH}/Makefile.inc"
+
+SRCS+= \
+	 libc_start1.c
+
+CFLAGS+= -I${LIBC_SRCTOP}/csu/${LIBC_ARCH}
+SYM_MAPS+=${LIBC_SRCTOP}/csu/Symbol.map
diff --git a/lib/libc/csu/Symbol.map b/lib/libc/csu/Symbol.map
new file mode 100644
index 000000000000..7fc09add5e45
--- /dev/null
+++ b/lib/libc/csu/Symbol.map
@@ -0,0 +1,4 @@
+FBSD_1.7 {
+	__libc_start1;
+	__libc_start1_gcrt;
+};
diff --git a/lib/libc/csu/aarch64/Makefile.inc b/lib/libc/csu/aarch64/Makefile.inc
new file mode 100644
index 000000000000..6c315c5e2624
--- /dev/null
+++ b/lib/libc/csu/aarch64/Makefile.inc
@@ -0,0 +1,3 @@
+#
+
+CFLAGS+=	-DCRT_IRELOC_RELA
diff --git a/lib/libc/csu/aarch64/reloc.c b/lib/libc/csu/aarch64/reloc.c
new file mode 100644
index 000000000000..4ba7920bcb07
--- /dev/null
+++ b/lib/libc/csu/aarch64/reloc.c
@@ -0,0 +1,50 @@
+/*-
+ * Copyright (c) 2019 Leandro Lupori
+ * Copyright (c) 2021 The FreeBSD Foundation
+ *
+ * Portions of this software were developed by Andrew Turner
+ * under sponsorship from the FreeBSD Foundation.
+ *
+ * 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.
+ *
+ * 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 <sys/cdefs.h>
+
+static void
+ifunc_init(const Elf_Auxinfo *aux __unused)
+{
+}
+
+static void
+crt1_handle_rela(const Elf_Rela *r)
+{
+	typedef Elf_Addr (*ifunc_resolver_t)(
+	    uint64_t, uint64_t, uint64_t, uint64_t,
+	    uint64_t, uint64_t, uint64_t, uint64_t);
+	Elf_Addr *ptr, *where, target;
+
+	switch (ELF_R_TYPE(r->r_info)) {
+	case R_AARCH64_IRELATIVE:
+		ptr = (Elf_Addr *)r->r_addend;
+		where = (Elf_Addr *)r->r_offset;
+		target = ((ifunc_resolver_t)ptr)(0, 0, 0, 0, 0, 0, 0, 0);
+		*where = target;
+		break;
+	}
+}
diff --git a/lib/libc/csu/amd64/Makefile.inc b/lib/libc/csu/amd64/Makefile.inc
new file mode 100644
index 000000000000..6c315c5e2624
--- /dev/null
+++ b/lib/libc/csu/amd64/Makefile.inc
@@ -0,0 +1,3 @@
+#
+
+CFLAGS+=	-DCRT_IRELOC_RELA
diff --git a/lib/libc/csu/amd64/reloc.c b/lib/libc/csu/amd64/reloc.c
new file mode 100644
index 000000000000..f1f83db9a391
--- /dev/null
+++ b/lib/libc/csu/amd64/reloc.c
@@ -0,0 +1,68 @@
+/*-
+ * Copyright (c) 2018 The FreeBSD Foundation
+ *
+ * This software was developed by Konstantin Belousov <kib@FreeBSD.org>
+ * under sponsorship from the FreeBSD Foundation.
+ *
+ * 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.
+ *
+ * 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 <sys/cdefs.h>
+
+#include <machine/specialreg.h>
+#include <machine/cpufunc.h>
+
+static uint32_t cpu_feature, cpu_feature2;
+static uint32_t cpu_stdext_feature, cpu_stdext_feature2;
+
+static void
+ifunc_init(const Elf_Auxinfo *aux __unused)
+{
+	u_int p[4];
+
+	do_cpuid(1, p);
+	cpu_feature = p[3];
+	cpu_feature2 = p[2];
+	do_cpuid(0, p);
+	if (p[0] >= 7) {
+		cpuid_count(7, 0, p);
+		cpu_stdext_feature = p[1];
+		cpu_stdext_feature2 = p[2];
+	} else {
+		cpu_stdext_feature = 0;
+		cpu_stdext_feature2 = 0;
+	}
+}
+
+static void
+crt1_handle_rela(const Elf_Rela *r)
+{
+	Elf_Addr *ptr, *where, target;
+
+	switch (ELF_R_TYPE(r->r_info)) {
+	case R_X86_64_IRELATIVE:
+		ptr = (Elf_Addr *)r->r_addend;
+		where = (Elf_Addr *)r->r_offset;
+		target = ((Elf_Addr (*)(uint32_t, uint32_t, uint32_t,
+		    uint32_t))ptr)(cpu_feature, cpu_feature2,
+		    cpu_stdext_feature, cpu_stdext_feature2);
+		*where = target;
+		break;
+	}
+}
diff --git a/lib/libc/csu/arm/Makefile.inc b/lib/libc/csu/arm/Makefile.inc
new file mode 100644
index 000000000000..ddead75f874d
--- /dev/null
+++ b/lib/libc/csu/arm/Makefile.inc
@@ -0,0 +1,3 @@
+#
+
+CFLAGS+=	-DCRT_IRELOC_SUPPRESS
diff --git a/lib/libc/csu/i386/Makefile.inc b/lib/libc/csu/i386/Makefile.inc
new file mode 100644
index 000000000000..32018000e1f2
--- /dev/null
+++ b/lib/libc/csu/i386/Makefile.inc
@@ -0,0 +1,3 @@
+#
+
+CFLAGS+=	-DCRT_IRELOC_REL
diff --git a/lib/libc/csu/i386/reloc.c b/lib/libc/csu/i386/reloc.c
new file mode 100644
index 000000000000..7097f58d8f26
--- /dev/null
+++ b/lib/libc/csu/i386/reloc.c
@@ -0,0 +1,90 @@
+/*-
+ * Copyright (c) 2018 The FreeBSD Foundation
+ *
+ * This software was developed by Konstantin Belousov <kib@FreeBSD.org>
+ * under sponsorship from the FreeBSD Foundation.
+ *
+ * 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.
+ *
+ * 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 <sys/cdefs.h>
+
+#include <machine/specialreg.h>
+#include <machine/cpufunc.h>
+
+static uint32_t cpu_feature, cpu_feature2;
+static uint32_t cpu_stdext_feature, cpu_stdext_feature2;
+
+static void
+ifunc_init(const Elf_Auxinfo *aux __unused)
+{
+	u_int cpuid_supported, p[4];
+
+	__asm __volatile(
+	    "	pushfl\n"
+	    "	popl	%%eax\n"
+	    "	movl    %%eax,%%ecx\n"
+	    "	xorl    $0x200000,%%eax\n"
+	    "	pushl	%%eax\n"
+	    "	popfl\n"
+	    "	pushfl\n"
+	    "	popl    %%eax\n"
+	    "	xorl    %%eax,%%ecx\n"
+	    "	je	1f\n"
+	    "	movl	$1,%0\n"
+	    "	jmp	2f\n"
+	    "1:	movl	$0,%0\n"
+	    "2:\n"
+	    : "=r" (cpuid_supported) : : "eax", "ecx", "cc");
+	if (cpuid_supported) {
+		do_cpuid(1, p);
+		cpu_feature = p[3];
+		cpu_feature2 = p[2];
+		do_cpuid(0, p);
+		if (p[0] >= 7) {
+			cpuid_count(7, 0, p);
+			cpu_stdext_feature = p[1];
+			cpu_stdext_feature2 = p[2];
+		} else {
+			cpu_stdext_feature = 0;
+			cpu_stdext_feature2 = 0;
+		}
+	} else {
+		cpu_feature = 0;
+		cpu_feature2 = 0;
+		cpu_stdext_feature = 0;
+		cpu_stdext_feature2 = 0;
+	}
+}
+
+static void
+crt1_handle_rel(const Elf_Rel *r)
+{
+	Elf_Addr *where, target;
+
+	switch (ELF_R_TYPE(r->r_info)) {
+	case R_386_IRELATIVE:
+		where = (Elf_Addr *)r->r_offset;
+		target = ((Elf_Addr (*)(uint32_t, uint32_t, uint32_t,
+		    uint32_t))*where)(cpu_feature, cpu_feature2,
+		    cpu_stdext_feature, cpu_stdext_feature2);
+		*where = target;
+		break;
+	}
+}
diff --git a/lib/libc/csu/libc_start1.c b/lib/libc/csu/libc_start1.c
new file mode 100644
index 000000000000..5b08ba03ba8c
--- /dev/null
+++ b/lib/libc/csu/libc_start1.c
@@ -0,0 +1,207 @@
+/*-
+ * SPDX-License-Identifier: BSD-1-Clause
+ *
+ * Copyright 2012 Konstantin Belousov <kib@FreeBSD.org>
+ * Copyright (c) 2018, 2023 The FreeBSD Foundation
+ *
+ * Parts of this software was developed by Konstantin Belousov
+ * <kib@FreeBSD.org> under sponsorship from the FreeBSD Foundation.
+ *
+ * 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.
+ *
+ * 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/param.h>
+#include <sys/elf.h>
+#include <sys/elf_common.h>
+#include <errno.h>
+#include <stdlib.h>
+#include "libc_private.h"
+
+extern void (*__preinit_array_start[])(int, char **, char **) __hidden;
+extern void (*__preinit_array_end[])(int, char **, char **) __hidden;
+extern void (*__init_array_start[])(int, char **, char **) __hidden;
+extern void (*__init_array_end[])(int, char **, char **) __hidden;
+extern void (*__fini_array_start[])(void) __hidden;
+extern void (*__fini_array_end[])(void) __hidden;
+extern void _fini(void) __hidden;
+extern void _init(void) __hidden;
+
+extern int _DYNAMIC;
+#pragma weak _DYNAMIC
+
+#if defined(CRT_IRELOC_RELA)
+extern const Elf_Rela __rela_iplt_start[] __weak_symbol __hidden;
+extern const Elf_Rela __rela_iplt_end[] __weak_symbol __hidden;
+
+#include "reloc.c"
+
+static void
+process_irelocs(void)
+{
+	const Elf_Rela *r;
+
+	for (r = &__rela_iplt_start[0]; r < &__rela_iplt_end[0]; r++)
+		crt1_handle_rela(r);
+}
+#elif defined(CRT_IRELOC_REL)
+extern const Elf_Rel __rel_iplt_start[] __weak_symbol __hidden;
+extern const Elf_Rel __rel_iplt_end[] __weak_symbol __hidden;
+
+#include "reloc.c"
+
+static void
+process_irelocs(void)
+{
+	const Elf_Rel *r;
+
+	for (r = &__rel_iplt_start[0]; r < &__rel_iplt_end[0]; r++)
+		crt1_handle_rel(r);
+}
+#elif defined(CRT_IRELOC_SUPPRESS)
+#else
+#error "Define platform reloc type"
+#endif
+
+#ifndef PIC
+static void
+finalizer(void)
+{
+	void (*fn)(void);
+	size_t array_size, n;
+
+	array_size = __fini_array_end - __fini_array_start;
+	for (n = array_size; n > 0; n--) {
+		fn = __fini_array_start[n - 1];
+		if ((uintptr_t)fn != 0 && (uintptr_t)fn != 1)
+			(fn)();
+	}
+	_fini();
+}
+#endif
+
+static void
+handle_static_init(int argc, char **argv, char **env)
+{
+#ifndef PIC
+	void (*fn)(int, char **, char **);
+	size_t array_size, n;
+
+	if (&_DYNAMIC != NULL)
+		return;
+
+	atexit(finalizer);
+
+	array_size = __preinit_array_end - __preinit_array_start;
+	for (n = 0; n < array_size; n++) {
+		fn = __preinit_array_start[n];
+		if ((uintptr_t)fn != 0 && (uintptr_t)fn != 1)
+			fn(argc, argv, env);
+	}
+	_init();
+	array_size = __init_array_end - __init_array_start;
+	for (n = 0; n < array_size; n++) {
+		fn = __init_array_start[n];
+		if ((uintptr_t)fn != 0 && (uintptr_t)fn != 1)
+			fn(argc, argv, env);
+	}
+#endif
+}
+
+static void
+handle_argv(int argc, char *argv[], char **env)
+{
+	const char *s;
+
+	if (environ == NULL)
+		environ = env;
+	if (argc > 0 && argv[0] != NULL) {
+		__progname = argv[0];
+		for (s = __progname; *s != '\0'; s++) {
+			if (*s == '/')
+				__progname = s + 1;
+		}
+	}
+}
+
+static void
+handle_irelocs(char *env[])
+{
+#ifndef CRT_IRELOC_SUPPRESS
+	const Elf_Auxinfo *aux;
+
+	/* Find the auxiliary vector on the stack. */
+	while (*env++ != 0)	/* Skip over environment, and NULL terminator */
+		;
+	aux = (const Elf_Auxinfo *)env;
+
+	ifunc_init(aux);
+	process_irelocs();
+#else
+	(void)env;
+#endif
+}
+
+void
+__libc_start1(int argc, char *argv[], char *env[], void (*cleanup)(void),
+    int (*mainX)(int, char *[], char *[]))
+{
+	handle_argv(argc, argv, env);
+
+	if (&_DYNAMIC != NULL) {
+		atexit(cleanup);
+	} else {
+		handle_irelocs(env);
+		_init_tls();
+	}
+
+	handle_static_init(argc, argv, env);
+
+	/*
+	 * C17 4.3 paragraph 3:
+	 * The value of errno in the initial thread is zero at program
+	 * startup.
+	 */
+	errno = 0;
+	exit(mainX(argc, argv, env));
+}
+
+/* XXXKIB _mcleanup and monstartup defs */
+extern void _mcleanup(void);
+extern void monstartup(void *, void *);
+
+void
+__libc_start1_gcrt(int argc, char *argv[], char *env[],
+    void (*cleanup)(void), int (*mainX)(int, char *[], char *[]),
+    int *eprolp, int *etextp)
+{
+	handle_argv(argc, argv, env);
+
+	if (&_DYNAMIC != NULL) {
+		atexit(cleanup);
+	} else {
+		handle_irelocs(env);
+		_init_tls();
+	}
+
+	atexit(_mcleanup);
+	monstartup(eprolp, etextp);
+
+	handle_static_init(argc, argv, env);
+	errno = 0;
+	exit(mainX(argc, argv, env));
+}
diff --git a/lib/libc/csu/powerpc/Makefile.inc b/lib/libc/csu/powerpc/Makefile.inc
new file mode 100644
index 000000000000..ddead75f874d
--- /dev/null
+++ b/lib/libc/csu/powerpc/Makefile.inc
@@ -0,0 +1,3 @@
+#
+
+CFLAGS+=	-DCRT_IRELOC_SUPPRESS
diff --git a/lib/libc/csu/powerpc64/Makefile.inc b/lib/libc/csu/powerpc64/Makefile.inc
new file mode 100644
index 000000000000..6c315c5e2624
--- /dev/null
+++ b/lib/libc/csu/powerpc64/Makefile.inc
@@ -0,0 +1,3 @@
+#
+
+CFLAGS+=	-DCRT_IRELOC_RELA
diff --git a/lib/libc/csu/powerpc64/reloc.c b/lib/libc/csu/powerpc64/reloc.c
new file mode 100644
index 000000000000..5637e6534197
--- /dev/null
+++ b/lib/libc/csu/powerpc64/reloc.c
@@ -0,0 +1,59 @@
+/*-
+ * Copyright (c) 2019 Leandro Lupori
+ *
+ * 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.
+ *
+ * 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.
+ */
+
+static uint32_t cpu_features;
+static uint32_t cpu_features2;
+
+static void
+ifunc_init(const Elf_Auxinfo *aux)
+{
+	/* Digest the auxiliary vector. */
+	for (;  aux->a_type != AT_NULL; aux++) {
+		switch (aux->a_type) {
+		case AT_HWCAP:
+			cpu_features = (uint32_t)aux->a_un.a_val;
+			break;
+		case AT_HWCAP2:
+			cpu_features2 = (uint32_t)aux->a_un.a_val;
+			break;
+		}
+	}
+}
+
+static void
+crt1_handle_rela(const Elf_Rela *r)
+{
+	typedef Elf_Addr (*ifunc_resolver_t)(
+	    uint32_t, uint32_t, uint64_t, uint64_t,
+	    uint64_t, uint64_t, uint64_t, uint64_t);
+	Elf_Addr *ptr, *where, target;
+
+	switch (ELF_R_TYPE(r->r_info)) {
+	case R_PPC_IRELATIVE:
+		ptr = (Elf_Addr *)r->r_addend;
+		where = (Elf_Addr *)r->r_offset;
+		target = ((ifunc_resolver_t)ptr)(cpu_features, cpu_features2,
+		    0, 0, 0, 0, 0, 0);
+		*where = target;
+		break;
+	}
+}
diff --git a/lib/libc/csu/powerpcspe/Makefile.inc b/lib/libc/csu/powerpcspe/Makefile.inc
new file mode 100644
index 000000000000..ddead75f874d
--- /dev/null
+++ b/lib/libc/csu/powerpcspe/Makefile.inc
@@ -0,0 +1,3 @@
+#
+
+CFLAGS+=	-DCRT_IRELOC_SUPPRESS
diff --git a/lib/libc/csu/riscv/Makefile.inc b/lib/libc/csu/riscv/Makefile.inc
new file mode 100644
index 000000000000..6c315c5e2624
--- /dev/null
+++ b/lib/libc/csu/riscv/Makefile.inc
@@ -0,0 +1,3 @@
+#
+
+CFLAGS+=	-DCRT_IRELOC_RELA
diff --git a/lib/libc/csu/riscv/reloc.c b/lib/libc/csu/riscv/reloc.c
new file mode 100644
index 000000000000..6ae85085089b
--- /dev/null
+++ b/lib/libc/csu/riscv/reloc.c
@@ -0,0 +1,56 @@
+/*-
+ * Copyright (c) 2019 Leandro Lupori
+ * Copyright (c) 2024 Jessica Clarke <jrtc27@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.
+ *
+ * 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.
+ */
+
+static unsigned long elf_hwcap;
+
+static void
+ifunc_init(const Elf_Auxinfo *aux)
+{
+	/* Digest the auxiliary vector. */
+	for (; aux->a_type != AT_NULL; aux++) {
+		switch (aux->a_type) {
+		case AT_HWCAP:
+			elf_hwcap = (uint32_t)aux->a_un.a_val;
+			break;
+		}
+	}
+}
+
+static void
+crt1_handle_rela(const Elf_Rela *r)
+{
+	typedef Elf_Addr (*ifunc_resolver_t)(
+	    unsigned long, unsigned long, unsigned long, unsigned long,
+	    unsigned long, unsigned long, unsigned long, unsigned long);
+	Elf_Addr *ptr, *where, target;
+
+	switch (ELF_R_TYPE(r->r_info)) {
+	case R_RISCV_IRELATIVE:
+		ptr = (Elf_Addr *)r->r_addend;
+		where = (Elf_Addr *)r->r_offset;
+		target = ((ifunc_resolver_t)ptr)(elf_hwcap,
+		    0, 0, 0, 0, 0, 0, 0);
+		*where = target;
+		break;
+	}
+}