git: aea1d51e854e - stable/13 - csu: move common code to libc
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Date: Mon, 12 Jun 2023 12:22:26 UTC
The branch stable/13 has been updated by kib:
URL: https://cgit.FreeBSD.org/src/commit/?id=aea1d51e854e06565b609d4fb065787d7d8328b4
commit aea1d51e854e06565b609d4fb065787d7d8328b4
Author: Konstantin Belousov <kib@FreeBSD.org>
AuthorDate: 2022-10-30 23:47:44 +0000
Commit: Konstantin Belousov <kib@FreeBSD.org>
CommitDate: 2023-06-12 12:19:38 +0000
csu: move common code to libc
For MFC purposes, keep lib/csu code intact, only add lib/libc/csu bits.
This allows stable/13 to run simple binaries compiled on 14.
(cherry picked from commit 51015e6d0f570239b0c2088dc6cf2b018928375d)
---
lib/libc/Makefile | 1 +
lib/libc/csu/Makefile.inc | 10 ++
lib/libc/csu/Symbol.map | 4 +
lib/libc/csu/aarch64/Makefile.inc | 4 +
lib/libc/csu/aarch64/reloc.c | 46 +++++++++
lib/libc/csu/amd64/Makefile.inc | 4 +
lib/libc/csu/amd64/reloc.c | 63 ++++++++++++
lib/libc/csu/arm/Makefile.inc | 4 +
lib/libc/csu/i386/Makefile.inc | 4 +
lib/libc/csu/i386/reloc.c | 85 +++++++++++++++++
lib/libc/csu/ignore_init.c | 184 ++++++++++++++++++++++++++++++++++++
lib/libc/csu/mips/Makefile.inc | 4 +
lib/libc/csu/powerpc/Makefile.inc | 4 +
lib/libc/csu/powerpc64/Makefile.inc | 4 +
lib/libc/csu/powerpc64/reloc.c | 69 ++++++++++++++
lib/libc/csu/riscv/Makefile.inc | 4 +
lib/libc/include/libc_private.h | 6 ++
17 files changed, 500 insertions(+)
diff --git a/lib/libc/Makefile b/lib/libc/Makefile
index 6363cef8d48b..43efccba08dd 100644
--- a/lib/libc/Makefile
+++ b/lib/libc/Makefile
@@ -93,6 +93,7 @@ MIASM=
NOASM=
.include "${LIBC_SRCTOP}/${LIBC_ARCH}/Makefile.inc"
+.include "${LIBC_SRCTOP}/csu/Makefile.inc"
.include "${LIBC_SRCTOP}/db/Makefile.inc"
.include "${LIBC_SRCTOP}/compat-43/Makefile.inc"
.include "${LIBC_SRCTOP}/gdtoa/Makefile.inc"
diff --git a/lib/libc/csu/Makefile.inc b/lib/libc/csu/Makefile.inc
new file mode 100644
index 000000000000..453303bea608
--- /dev/null
+++ b/lib/libc/csu/Makefile.inc
@@ -0,0 +1,10 @@
+#
+
+.PATH: ${LIBC_SRCTOP}/csu
+.include "${LIBC_SRCTOP}/csu/${LIBC_ARCH}/Makefile.inc"
+
+SRCS+= \
+ ignore_init.c
+
+CFLAGS+= -I${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..b3420a638164
--- /dev/null
+++ b/lib/libc/csu/aarch64/Makefile.inc
@@ -0,0 +1,4 @@
+#
+
+CFLAGS+= -DCRT_IRELOC_RELA \
+ -DINIT_IRELOCS=""
diff --git a/lib/libc/csu/aarch64/reloc.c b/lib/libc/csu/aarch64/reloc.c
new file mode 100644
index 000000000000..f3dbf3e3b570
--- /dev/null
+++ b/lib/libc/csu/aarch64/reloc.c
@@ -0,0 +1,46 @@
+/*-
+ * 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>
+__FBSDID("$FreeBSD$");
+
+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..b3420a638164
--- /dev/null
+++ b/lib/libc/csu/amd64/Makefile.inc
@@ -0,0 +1,4 @@
+#
+
+CFLAGS+= -DCRT_IRELOC_RELA \
+ -DINIT_IRELOCS=""
diff --git a/lib/libc/csu/amd64/reloc.c b/lib/libc/csu/amd64/reloc.c
new file mode 100644
index 000000000000..adb52e42a32c
--- /dev/null
+++ b/lib/libc/csu/amd64/reloc.c
@@ -0,0 +1,63 @@
+/*-
+ * 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>
+__FBSDID("$FreeBSD$");
+
+#include <machine/specialreg.h>
+#include <machine/cpufunc.h>
+
+static void
+crt1_handle_rela(const Elf_Rela *r)
+{
+ Elf_Addr *ptr, *where, target;
+ u_int p[4];
+ uint32_t cpu_feature, cpu_feature2;
+ uint32_t cpu_stdext_feature, cpu_stdext_feature2;
+
+ 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;
+ }
+
+ 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..2534e6579f38
--- /dev/null
+++ b/lib/libc/csu/arm/Makefile.inc
@@ -0,0 +1,4 @@
+#
+
+CFLAGS+= -DCRT_IRELOC_SUPPRESS \
+ -DINIT_IRELOCS=""
diff --git a/lib/libc/csu/i386/Makefile.inc b/lib/libc/csu/i386/Makefile.inc
new file mode 100644
index 000000000000..ac0984df2349
--- /dev/null
+++ b/lib/libc/csu/i386/Makefile.inc
@@ -0,0 +1,4 @@
+#
+
+CFLAGS+= -DCRT_IRELOC_REL \
+ -DINIT_IRELOCS=""
diff --git a/lib/libc/csu/i386/reloc.c b/lib/libc/csu/i386/reloc.c
new file mode 100644
index 000000000000..13438035841d
--- /dev/null
+++ b/lib/libc/csu/i386/reloc.c
@@ -0,0 +1,85 @@
+/*-
+ * 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>
+__FBSDID("$FreeBSD$");
+
+#include <machine/specialreg.h>
+#include <machine/cpufunc.h>
+
+static void
+crt1_handle_rel(const Elf_Rel *r)
+{
+ Elf_Addr *where, target;
+ u_int cpuid_supported, p[4];
+ uint32_t cpu_feature, cpu_feature2;
+ uint32_t cpu_stdext_feature, cpu_stdext_feature2;
+
+ __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;
+ }
+
+ 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/ignore_init.c b/lib/libc/csu/ignore_init.c
new file mode 100644
index 000000000000..60c45d7e735f
--- /dev/null
+++ b/lib/libc/csu/ignore_init.c
@@ -0,0 +1,184 @@
+/*-
+ * 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 <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
+
+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();
+}
+
+static void
+handle_static_init(int argc, char **argv, char **env)
+{
+ 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);
+ }
+}
+
+extern char **environ;
+
+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;
+ }
+ }
+}
+
+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 {
+#ifndef CRT_IRELOC_SUPPRESS
+ INIT_IRELOCS;
+ process_irelocs();
+#endif
+ _init_tls();
+ }
+
+ handle_static_init(argc, argv, env);
+ 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 {
+#ifndef CRT_IRELOC_SUPPRESS
+ INIT_IRELOCS;
+ process_irelocs();
+#endif
+ _init_tls();
+ }
+
+ atexit(_mcleanup);
+ monstartup(eprolp, etextp);
+
+ handle_static_init(argc, argv, env);
+ exit(mainX(argc, argv, env));
+}
diff --git a/lib/libc/csu/mips/Makefile.inc b/lib/libc/csu/mips/Makefile.inc
new file mode 100644
index 000000000000..2534e6579f38
--- /dev/null
+++ b/lib/libc/csu/mips/Makefile.inc
@@ -0,0 +1,4 @@
+#
+
+CFLAGS+= -DCRT_IRELOC_SUPPRESS \
+ -DINIT_IRELOCS=""
diff --git a/lib/libc/csu/powerpc/Makefile.inc b/lib/libc/csu/powerpc/Makefile.inc
new file mode 100644
index 000000000000..2534e6579f38
--- /dev/null
+++ b/lib/libc/csu/powerpc/Makefile.inc
@@ -0,0 +1,4 @@
+#
+
+CFLAGS+= -DCRT_IRELOC_SUPPRESS \
+ -DINIT_IRELOCS=""
diff --git a/lib/libc/csu/powerpc64/Makefile.inc b/lib/libc/csu/powerpc64/Makefile.inc
new file mode 100644
index 000000000000..5d59d40eb393
--- /dev/null
+++ b/lib/libc/csu/powerpc64/Makefile.inc
@@ -0,0 +1,4 @@
+#
+
+CFLAGS+= -DCRT_IRELOC_RELA \
+ -DINIT_IRELOCS="init_cpu_features(env)"
diff --git a/lib/libc/csu/powerpc64/reloc.c b/lib/libc/csu/powerpc64/reloc.c
new file mode 100644
index 000000000000..5ba191d07cd9
--- /dev/null
+++ b/lib/libc/csu/powerpc64/reloc.c
@@ -0,0 +1,69 @@
+/*-
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+static uint32_t cpu_features;
+static uint32_t cpu_features2;
+
+static void
+init_cpu_features(char **env)
+{
+ 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;
+
+ /* 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/riscv/Makefile.inc b/lib/libc/csu/riscv/Makefile.inc
new file mode 100644
index 000000000000..2534e6579f38
--- /dev/null
+++ b/lib/libc/csu/riscv/Makefile.inc
@@ -0,0 +1,4 @@
+#
+
+CFLAGS+= -DCRT_IRELOC_SUPPRESS \
+ -DINIT_IRELOCS=""
diff --git a/lib/libc/include/libc_private.h b/lib/libc/include/libc_private.h
index 78a75cc6284d..5fa7a6da1198 100644
--- a/lib/libc/include/libc_private.h
+++ b/lib/libc/include/libc_private.h
@@ -255,6 +255,12 @@ enum {
int _yp_check(char **);
#endif
+void __libc_start1(int, char *[], char *[],
+ void (*)(void), int (*)(int, char *[], char *[])) __dead2;
+void __libc_start1_gcrt(int, char *[], char *[],
+ void (*)(void), int (*)(int, char *[], char *[]),
+ int *, int *) __dead2;
+
/*
* Initialise TLS for static programs
*/