libc: update NetBSD crt0 to 11.0

lib/libc/netbsd/lib/csu/arch/riscv/crt0.S

@@ -0,0 +1,62 @@
+/*	$NetBSD: crt0.S,v 1.3.4.1 2026/03/04 19:27:22 martin Exp $	*/
+
+/*-
+ * Copyright (c) 2014 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Matt Thomas of 3am Software Foundry.
+ *
+ * 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 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.
+ */
+
+#include <machine/asm.h>
+
+RCSID("$NetBSD: crt0.S,v 1.3.4.1 2026/03/04 19:27:22 martin Exp $")
+
+STRONG_ALIAS(_start,__start)
+
+_ENTRY(__start)
+	/*
+	 * void ___start(void (*cleanup)(void), struct ps_strings *ps_strings);
+	 */
+	.option push
+	.option norelax
+	lla	gp, __global_pointer$
+	.option pop
+
+	j	___start
+END(__start)
+
+	.option push
+	.option norelax
+
+_ENTRY(_start_setgp)
+	lla	gp, __global_pointer$
+	.option pop
+	ret
+END(_start_setgp)
+
+	.section	.preinit_array, "aw"
+	.p2align	PTR_SCALESHIFT
+	PTR_WORD	_start_setgp
+

lib/libc/netbsd/lib/csu/common/crt0-common.c

@@ -1,4 +1,4 @@
-/* $NetBSD: crt0-common.c,v 1.27 2022/06/21 06:52:17 skrll Exp $ */
+/* $NetBSD: crt0-common.c,v 1.30 2025/05/02 23:04:06 riastradh Exp $ */
 
 /*
  * Copyright (c) 1998 Christos Zoulas
@@ -36,13 +36,16 @@
  */
 
 #include <sys/cdefs.h>
-__RCSID("$NetBSD: crt0-common.c,v 1.27 2022/06/21 06:52:17 skrll Exp $");
+__RCSID("$NetBSD: crt0-common.c,v 1.30 2025/05/02 23:04:06 riastradh Exp $");
 
 #include <sys/types.h>
 #include <sys/exec.h>
 #include <sys/exec_elf.h>
 #include <sys/syscall.h>
+
 #include <machine/profile.h>
+
+#include <limits.h>
 #include <stdlib.h>
 #include <unistd.h>
 
@@ -55,7 +58,6 @@ typedef void (*fptr_t)(void);
 extern void	_init(void);
 extern void	_fini(void);
 #endif
-extern void	_libc_init(void);
 
 /*
  * Arrange for _DYNAMIC to be weak and undefined (and therefore to show up
@@ -254,11 +256,19 @@ relocate_self(struct ps_strings *ps_strings)
 
 	Elf_Dyn *dynp = (Elf_Dyn *)((uint8_t *)dynphdr->p_vaddr + relocbase);
 
+	const Elf_Relr *relr = 0, *relrlim;
 	const REL_TYPE *relocs = 0, *relocslim;
-	Elf_Addr relocssz = 0;
+	Elf_Addr relrsz = 0, relocssz = 0;
 
 	for (; dynp->d_tag != DT_NULL; dynp++) {
 		switch (dynp->d_tag) {
+		case DT_RELR:
+			relr =
+			    (const Elf_Relr *)(relocbase + dynp->d_un.d_ptr);
+			break;
+		case DT_RELRSZ:
+			relrsz = dynp->d_un.d_val;
+			break;
 		case REL_TAG:
 			relocs =
 			    (const REL_TYPE *)(relocbase + dynp->d_un.d_ptr);
@@ -268,7 +278,22 @@ relocate_self(struct ps_strings *ps_strings)
 			break;
 		}
 	}
+	relrlim = (const Elf_Relr *)((const uint8_t *)relr + relrsz);
 	relocslim = (const REL_TYPE *)((const uint8_t *)relocs + relocssz);
+	while (relr < relrlim) {
+		Elf_Addr *where;
+
+		where = (Elf_Addr *)(relocbase + *relr);
+		*where++ += relocbase;
+		while (++relr < relrlim && *relr & 1) {
+			unsigned i;
+
+			for (i = 1; i < CHAR_BIT*sizeof(*relr); i++, where++) {
+				if (*relr & ((Elf_Relr)1 << i))
+					*where += relocbase;
+			}
+		}
+	}
 	for (; relocs < relocslim; ++relocs) {
 		Elf_Addr *where;
 
@@ -318,9 +343,6 @@ ___start(void (*cleanup)(void),			/* from shared loader */
 		__progname = empty_string;
 	}
 
-	if (cleanup != NULL)
-		atexit(cleanup);
-
 	_libc_init();
 
 	if (&rtld_DYNAMIC == NULL) {
@@ -334,6 +356,9 @@ ___start(void (*cleanup)(void),			/* from shared loader */
 
 	_preinit();
 
+	if (cleanup != NULL)
+		atexit(cleanup);
+
 #ifdef MCRT0
 	atexit(_mcleanup);
 	monstartup((u_long)&__eprol, (u_long)&__etext);

lib/libc/netbsd/lib/csu/common/csu-common.h

@@ -36,3 +36,5 @@
 extern char *__progname __common;
 extern char **environ __common;
 extern struct ps_strings *__ps_strings __common;
+
+void    _libc_init(void) __attribute__((__constructor__, __used__));

src/libs/netbsd.zig

@@ -158,6 +158,12 @@ pub fn buildCrtFile(comp: *Compilation, crt_file: CrtFile, prog_node: std.Progre
                     .condition = target.cpu.arch == .powerpc,
                 },
 
+                .{
+                    .path = "arch" ++ path.sep_str ++ "riscv" ++ path.sep_str ++ "crt0.S",
+                    .flags = acflags.items,
+                    .condition = target.cpu.arch.isRISCV(),
+                },
+
                 .{
                     .path = "arch" ++ path.sep_str ++ "sparc" ++ path.sep_str ++ "crt0.S",
                     .flags = acflags.items,