Import arm bits for rtld-elf.

Obtained from:	NetBSD

6 files changed, 684 insertions, 2 deletions

diff --git a/libexec/rtld-elf/Makefile b/libexec/rtld-elf/Makefile
index 6168374..8418ca1 100644
--- a/libexec/rtld-elf/Makefile
+++ b/libexec/rtld-elf/Makefile
@@ -1,8 +1,8 @@
 # $FreeBSD$
 
 PROG?=		ld-elf.so.1
-SRCS=		rtld_start.S rtld.c rtld_lock.c map_object.c malloc.c \
-		xmalloc.c debug.c reloc.c libmap.c
+SRCS=		reloc.c rtld.c rtld_start.S rtld_lock.c map_object.c \
+		malloc.c xmalloc.c debug.c libmap.c
 MAN=		rtld.1
 CSTD?=		gnu99
 CFLAGS+=	-Wall -DFREEBSD_ELF -DIN_RTLD
diff --git a/libexec/rtld-elf/arm/Makefile.inc b/libexec/rtld-elf/arm/Makefile.inc
new file mode 100644
index 0000000..e8c0da7
--- /dev/null
+++ b/libexec/rtld-elf/arm/Makefile.inc
@@ -0,0 +1 @@
+# $FreeBSD$
diff --git a/libexec/rtld-elf/arm/lockdflt.c b/libexec/rtld-elf/arm/lockdflt.c
new file mode 100644
index 0000000..a4e148a
--- /dev/null
+++ b/libexec/rtld-elf/arm/lockdflt.c
@@ -0,0 +1,171 @@
+/*-
+ * Copyright 1999, 2000 John D. Polstra.
+ * 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.
+ *
+ * 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.
+ *
+ *	from: FreeBSD: src/libexec/rtld-elf/alpha/lockdflt.c,v 1.6 2000/07/17
+ * $FreeBSD$
+ */
+
+/*
+ * Thread locking implementation for the dynamic linker.
+ *
+ * We use the "simple, non-scalable reader-preference lock" from:
+ *
+ *   J. M. Mellor-Crummey and M. L. Scott. "Scalable Reader-Writer
+ *   Synchronization for Shared-Memory Multiprocessors." 3rd ACM Symp. on
+ *   Principles and Practice of Parallel Programming, April 1991.
+ *
+ * In this algorithm the lock is a single word.  Its low-order bit is
+ * set when a writer holds the lock.  The remaining high-order bits
+ * contain a count of readers desiring the lock.  The algorithm requires
+ * atomic "compare_and_store" and "add" operations, which we implement
+ * using assembly language sequences in "rtld_start.S".
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+#include <signal.h>
+#include <stdlib.h>
+#include <time.h>
+
+#include <machine/atomic.h>
+
+#include "debug.h"
+#include "rtld.h"
+#include "rtld_machdep.h"
+
+#define WAFLAG		0x1	/* A writer holds the lock */
+#define RC_INCR		0x2	/* Adjusts count of readers desiring lock */
+
+typedef struct Struct_Lock {
+	volatile int lock;
+	void *base;
+} Lock;
+
+static sigset_t fullsigmask, oldsigmask;
+
+static void *
+lock_create(void *context)
+{
+    void *base;
+    char *p;
+    uintptr_t r;
+    Lock *l;
+
+    /*
+     * Arrange for the lock to occupy its own cache line.  First, we
+     * optimistically allocate just a cache line, hoping that malloc
+     * will give us a well-aligned block of memory.  If that doesn't
+     * work, we allocate a larger block and take a well-aligned cache
+     * line from it.
+     */
+    base = xmalloc(CACHE_LINE_SIZE);
+    p = (char *)base;
+    if ((uintptr_t)p % CACHE_LINE_SIZE != 0) {
+	free(base);
+	base = xmalloc(2 * CACHE_LINE_SIZE);
+	p = (char *)base;
+	if ((r = (uintptr_t)p % CACHE_LINE_SIZE) != 0)
+	    p += CACHE_LINE_SIZE - r;
+    }
+    l = (Lock *)p;
+    l->base = base;
+    l->lock = 0;
+    return l;
+}
+
+static void
+lock_destroy(void *lock)
+{
+    Lock *l = (Lock *)lock;
+
+    free(l->base);
+}
+
+static void
+rlock_acquire(void *lock)
+{
+    Lock *l = (Lock *)lock;
+
+    atomic_add_acq_int(&l->lock, RC_INCR);
+    while (l->lock & WAFLAG)
+	    ;	/* Spin */
+}
+
+static void
+wlock_acquire(void *lock)
+{
+    Lock *l = (Lock *)lock;
+    sigset_t tmp_oldsigmask;
+
+    for ( ; ; ) {
+	sigprocmask(SIG_BLOCK, &fullsigmask, &tmp_oldsigmask);
+	if (atomic_cmpset_acq_int(&l->lock, 0, WAFLAG))
+	    break;
+	sigprocmask(SIG_SETMASK, &tmp_oldsigmask, NULL);
+    }
+    oldsigmask = tmp_oldsigmask;
+}
+
+static void
+rlock_release(void *lock)
+{
+    Lock *l = (Lock *)lock;
+
+    atomic_add_rel_int(&l->lock, -RC_INCR);
+}
+
+static void
+wlock_release(void *lock)
+{
+    Lock *l = (Lock *)lock;
+
+    atomic_add_rel_int(&l->lock, -WAFLAG);
+    sigprocmask(SIG_SETMASK, &oldsigmask, NULL);
+}
+
+void
+lockdflt_init(LockInfo *li)
+{
+    li->context = NULL;
+    li->lock_create = lock_create;
+    li->rlock_acquire = rlock_acquire;
+    li->wlock_acquire = wlock_acquire;
+    li->rlock_release = rlock_release;
+    li->wlock_release = wlock_release;
+    li->lock_destroy = lock_destroy;
+    li->context_destroy = NULL;
+    /*
+     * Construct a mask to block all signals except traps which might
+     * conceivably be generated within the dynamic linker itself.
+     */
+    sigfillset(&fullsigmask);
+    sigdelset(&fullsigmask, SIGILL);
+    sigdelset(&fullsigmask, SIGTRAP);
+    sigdelset(&fullsigmask, SIGABRT);
+    sigdelset(&fullsigmask, SIGEMT);
+    sigdelset(&fullsigmask, SIGFPE);
+    sigdelset(&fullsigmask, SIGBUS);
+    sigdelset(&fullsigmask, SIGSEGV);
+    sigdelset(&fullsigmask, SIGSYS);
+}
diff --git a/libexec/rtld-elf/arm/reloc.c b/libexec/rtld-elf/arm/reloc.c
new file mode 100644
index 0000000..e4157b6
--- /dev/null
+++ b/libexec/rtld-elf/arm/reloc.c
@@ -0,0 +1,341 @@
+/*	$NetBSD: mdreloc.c,v 1.23 2003/07/26 15:04:38 mrg Exp $	*/
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+#include <sys/param.h>
+#include <sys/mman.h>
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include "debug.h"
+#include "rtld.h"
+
+void
+init_pltgot(Obj_Entry *obj)
+{       
+	if (obj->pltgot != NULL) {
+		obj->pltgot[1] = (Elf_Addr) obj;
+		obj->pltgot[2] = (Elf_Addr) &_rtld_bind_start;
+	}
+}
+
+int             
+do_copy_relocations(Obj_Entry *dstobj)
+{
+	const Elf_Rel *rellim;
+	const Elf_Rel *rel;
+
+	assert(dstobj->mainprog);	/* COPY relocations are invalid elsewhere */
+
+   	rellim = (const Elf_Rel *) ((caddr_t) dstobj->rel + dstobj->relsize);
+	for (rel = dstobj->rel;  rel < rellim;  rel++) {
+		if (ELF_R_TYPE(rel->r_info) == R_ARM_COPY) {
+	    		void *dstaddr;
+			const Elf_Sym *dstsym;
+			const char *name;
+			unsigned long hash;
+			size_t size;
+			const void *srcaddr;
+			const Elf_Sym *srcsym;
+			Obj_Entry *srcobj;
+			
+			dstaddr = (void *) (dstobj->relocbase + rel->r_offset);
+			dstsym = dstobj->symtab + ELF_R_SYM(rel->r_info);
+			name = dstobj->strtab + dstsym->st_name;
+			hash = elf_hash(name);
+			size = dstsym->st_size;
+			
+			for (srcobj = dstobj->next;  srcobj != NULL;  srcobj = srcobj->next)
+				if ((srcsym = symlook_obj(name, hash, srcobj, false)) != NULL)
+					break;
+			
+			if (srcobj == NULL) {
+				_rtld_error("Undefined symbol \"%s\" referenced from COPY"
+				    " relocation in %s", name, dstobj->path);
+				return -1;
+			}
+			
+			srcaddr = (const void *) (srcobj->relocbase + srcsym->st_value);
+			memcpy(dstaddr, srcaddr, size);
+		}
+	}
+	return 0;			     
+}
+
+void _rtld_bind_start(void);
+void _rtld_relocate_nonplt_self(Elf_Dyn *, Elf_Addr);
+
+int open();
+int _open();
+void
+_rtld_relocate_nonplt_self(Elf_Dyn *dynp, Elf_Addr relocbase)
+{
+	const Elf_Rel *rel = 0, *rellim;
+	Elf_Addr relsz = 0;
+	Elf_Addr *where;
+	uint32_t size;
+
+	for (; dynp->d_tag != DT_NULL; dynp++) {
+		switch (dynp->d_tag) {
+		case DT_REL:
+			rel = (const Elf_Rel *)(relocbase + dynp->d_un.d_ptr);
+			break;
+		case DT_RELSZ:
+			relsz = dynp->d_un.d_val;
+			break;
+		}
+	}
+	rellim = (const Elf_Rel *)((caddr_t)rel + relsz);
+	size = (rellim - 1)->r_offset - rel->r_offset;
+	mprotect((void*)relocbase, size, PROT_READ|PROT_WRITE|PROT_EXEC); 
+	for (; rel < rellim; rel++) {
+		where = (Elf_Addr *)(relocbase + rel->r_offset);
+		
+		*where += (Elf_Addr)relocbase;
+	}
+	mprotect((void*)relocbase, size, PROT_READ|PROT_EXEC);
+}
+/*
+ * It is possible for the compiler to emit relocations for unaligned data.
+ * We handle this situation with these inlines.
+ */
+#define	RELOC_ALIGNED_P(x) \
+	(((uintptr_t)(x) & (sizeof(void *) - 1)) == 0)
+
+static __inline Elf_Addr
+load_ptr(void *where)
+{
+	Elf_Addr res;
+
+	memcpy(&res, where, sizeof(res));
+
+	return (res);
+}
+
+static __inline void
+store_ptr(void *where, Elf_Addr val)
+{
+
+	memcpy(where, &val, sizeof(val));
+}
+
+static int
+reloc_nonplt_object(Obj_Entry *obj, const Elf_Rel *rel, SymCache *cache)
+{
+	Elf_Addr        *where;
+	const Elf_Sym   *def;
+	const Obj_Entry *defobj;
+	Elf_Addr         tmp;
+	unsigned long	 symnum;
+
+	where = (Elf_Addr *)(obj->relocbase + rel->r_offset);
+	symnum = ELF_R_SYM(rel->r_info);
+
+	switch (ELF_R_TYPE(rel->r_info)) {
+	case R_ARM_NONE:
+		break;
+		
+#if 1 /* XXX should not occur */
+	case R_ARM_PC24: {	/* word32 S - P + A */
+		Elf32_Sword addend;
+		
+		/*
+		 * Extract addend and sign-extend if needed.
+		 */
+		addend = *where;
+		if (addend & 0x00800000)
+			addend |= 0xff000000;
+		
+		def = find_symdef(symnum, obj, &defobj, false, cache);
+		if (def == NULL)
+				return -1;
+			tmp = (Elf_Addr)obj->relocbase + def->st_value
+			    - (Elf_Addr)where + (addend << 2);
+			if ((tmp & 0xfe000000) != 0xfe000000 &&
+			    (tmp & 0xfe000000) != 0) {
+				_rtld_error(
+				"%s: R_ARM_PC24 relocation @ %p to %s failed "
+				"(displacement %ld (%#lx) out of range)",
+				    obj->path, where,
+				    obj->strtab + obj->symtab[symnum].st_name,
+				    (long) tmp, (long) tmp);
+				return -1;
+			}
+			tmp >>= 2;
+			*where = (*where & 0xff000000) | (tmp & 0x00ffffff);
+			dbg("PC24 %s in %s --> %p @ %p in %s",
+			    obj->strtab + obj->symtab[symnum].st_name,
+			    obj->path, (void *)*where, where, defobj->path);
+			break;
+		}
+#endif
+
+		case R_ARM_ABS32:	/* word32 B + S + A */
+		case R_ARM_GLOB_DAT:	/* word32 B + S */
+			def = find_symdef(symnum, obj, &defobj, false, cache);
+			if (def == NULL)
+				return -1;
+			if (__predict_true(RELOC_ALIGNED_P(where))) {
+				tmp =  *where + (Elf_Addr)defobj->relocbase +
+				    def->st_value;
+				*where = tmp;
+			} else {
+				tmp = load_ptr(where) +
+				    (Elf_Addr)defobj->relocbase +
+				    def->st_value;
+				store_ptr(where, tmp);
+			}
+			dbg("ABS32/GLOB_DAT %s in %s --> %p @ %p in %s",
+			    obj->strtab + obj->symtab[symnum].st_name,
+			    obj->path, (void *)tmp, where, defobj->path);
+			break;
+
+		case R_ARM_RELATIVE:	/* word32 B + A */
+			if (__predict_true(RELOC_ALIGNED_P(where))) {
+				tmp = *where + (Elf_Addr)obj->relocbase;
+				*where = tmp;
+			} else {
+				tmp = load_ptr(where) +
+				    (Elf_Addr)obj->relocbase;
+				store_ptr(where, tmp);
+			}
+			dbg("RELATIVE in %s --> %p", obj->path,
+			    (void *)tmp);
+			break;
+
+		case R_ARM_COPY:
+			/*
+			 * These are deferred until all other relocations have
+			 * been done.  All we do here is make sure that the
+			 * COPY relocation is not in a shared library.  They
+			 * are allowed only in executable files.
+			 */
+			if (!obj->mainprog) {
+				_rtld_error(
+			"%s: Unexpected R_COPY relocation in shared library",
+				    obj->path);
+				return -1;
+			}
+			dbg("COPY (avoid in main)");
+			break;
+
+		default:
+			dbg("sym = %lu, type = %lu, offset = %p, "
+			    "contents = %p, symbol = %s",
+			    symnum, (u_long)ELF_R_TYPE(rel->r_info),
+			    (void *)rel->r_offset, (void *)load_ptr(where),
+			    obj->strtab + obj->symtab[symnum].st_name);
+			_rtld_error("%s: Unsupported relocation type %ld "
+			    "in non-PLT relocations\n",
+			    obj->path, (u_long) ELF_R_TYPE(rel->r_info));
+			return -1;
+	}
+	return 0;
+}
+
+/*
+ *  * Process non-PLT relocations
+ *   */
+int
+reloc_non_plt(Obj_Entry *obj, Obj_Entry *obj_rtld)
+{
+	const Elf_Rel *rellim;
+	const Elf_Rel *rel;
+	SymCache *cache;
+	int bytes = obj->nchains * sizeof(SymCache);
+	int r = -1;
+	
+	/*
+ 	 * The dynamic loader may be called from a thread, we have
+	 * limited amounts of stack available so we cannot use alloca().
+	 * 	 	 	 */
+	cache = mmap(NULL, bytes, PROT_READ|PROT_WRITE, MAP_ANON, -1, 0);
+	if (cache == MAP_FAILED)
+		cache = NULL;
+	
+	rellim = (const Elf_Rel *)((caddr_t)obj->rel + obj->relsize);
+	for (rel = obj->rel; rel < rellim; rel++) {
+		if (reloc_nonplt_object(obj, rel, cache) < 0)
+			goto done;
+	}
+	r = 0;
+done:
+	if (cache) {
+		munmap(cache, bytes);
+	}
+	return (r);
+}
+
+/*
+ *  * Process the PLT relocations.
+ *   */
+int
+reloc_plt(Obj_Entry *obj)
+{
+	const Elf_Rel *rellim;
+	const Elf_Rel *rel;
+		
+	rellim = (const Elf_Rel *)((char *)obj->pltrel +
+	    obj->pltrelsize);
+	for (rel = obj->pltrel;  rel < rellim;  rel++) {
+		Elf_Addr *where;
+
+		assert(ELF_R_TYPE(rel->r_info) == R_ARM_JUMP_SLOT);
+		
+		where = (Elf_Addr *)(obj->relocbase + rel->r_offset);
+		*where += (Elf_Addr )obj->relocbase;
+	}
+	
+	return (0);
+}
+
+/*
+ *  * LD_BIND_NOW was set - force relocation for all jump slots
+ *   */
+int
+reloc_jmpslots(Obj_Entry *obj)
+{
+	const Obj_Entry *defobj;
+	const Elf_Rel *rellim;
+	const Elf_Rel *rel;
+	const Elf_Sym *def;
+	Elf_Addr *where;
+	Elf_Addr target;
+	
+	rellim = (const Elf_Rel *)((char *)obj->pltrel + obj->pltrelsize);
+	for (rel = obj->pltrel; rel < rellim; rel++) {
+		assert(ELF_R_TYPE(rel->r_info) == R_ARM_JUMP_SLOT);
+		where = (Elf_Addr *)(obj->relocbase + rel->r_offset);
+		def = find_symdef(ELF_R_SYM(rel->r_info), obj, &defobj,
+		    true, NULL);
+		if (def == NULL) {
+			dbg("reloc_jmpslots: sym not found");
+			return (-1);
+		}
+		
+		target = (Elf_Addr)(defobj->relocbase + def->st_value);		
+		reloc_jmpslot(where, target, defobj, obj,
+		    (const Elf_Rel *) rel);
+	}
+	
+	obj->jmpslots_done = true;
+	
+	return (0);
+}
+
+Elf_Addr
+reloc_jmpslot(Elf_Addr *where, Elf_Addr target, const Obj_Entry *defobj,
+    		const Obj_Entry *obj, const Elf_Rel *rel)
+{
+
+	assert(ELF_R_TYPE(rel->r_info) == R_ARM_JUMP_SLOT);
+
+	if (*where != target)
+		*where = target;
+
+	return target;
+}
+
diff --git a/libexec/rtld-elf/arm/rtld_machdep.h b/libexec/rtld-elf/arm/rtld_machdep.h
new file mode 100644
index 0000000..02849a9
--- /dev/null
+++ b/libexec/rtld-elf/arm/rtld_machdep.h
@@ -0,0 +1,64 @@
+/*-
+ * Copyright (c) 1999, 2000 John D. Polstra.
+ * 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.
+ *
+ * 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.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef RTLD_MACHDEP_H
+#define RTLD_MACHDEP_H	1
+
+#include <sys/types.h>
+#include <machine/atomic.h>
+
+#define CACHE_LINE_SIZE	  32
+
+struct Struct_Obj_Entry;
+
+/* Return the address of the .dynamic section in the dynamic linker. */
+#if 0
+#define rtld_dynamic(obj) \
+    ((const Elf_Dyn *)((obj)->relocbase + (Elf_Addr)&_DYNAMIC))
+#endif
+#if 0
+#define rtld_dynamic(obj) (&_DYNAMIC)
+#endif
+#define rtld_dynamic(obj) (const Elf_Dyn *)((obj)->relocbase)
+Elf_Addr reloc_jmpslot(Elf_Addr *where, Elf_Addr target,
+		       const struct Struct_Obj_Entry *defobj,
+		       const struct Struct_Obj_Entry *obj,
+		       const Elf_Rel *rel);
+
+#define make_function_pointer(def, defobj) \
+	((defobj)->relocbase + (def)->st_value)
+
+#define call_initfini_pointer(obj, target) \
+	(((InitFunc)(target))())
+
+/*
+ * Lazy binding entry point, called via PLT.
+ */
+void _rtld_bind_start(void);
+
+#endif
diff --git a/libexec/rtld-elf/arm/rtld_start.S b/libexec/rtld-elf/arm/rtld_start.S
new file mode 100644
index 0000000..5b0619b
--- /dev/null
+++ b/libexec/rtld-elf/arm/rtld_start.S
@@ -0,0 +1,105 @@
+/*	$NetBSD: rtld_start.S,v 1.7 2002/09/12 17:18:38 mycroft Exp $	*/
+
+/*-
+ * Copyright (c) 1998, 2002 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Matt Thomas and by Charles M. Hannum.
+ *
+ * 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.
+ */
+
+#include <machine/asm.h>
+__FBSDID("$FreeBSD$");
+
+	.text
+	.align	0
+	.globl	.rtld_start
+	.type	.rtld_start,%function
+.rtld_start:
+	mov	r6, sp
+	sub	sp, sp, #8		/* make room for obj_main & exit proc */
+	mov	r4, r0			/* save ps_strings */
+	ldr	sl, .L2
+	ldr	r5, .L2+4
+	ldr	r0, .L2+8
+.L1:
+	add	sl, pc, sl
+	ldr	r5, [sl, r5]
+	ldr	r0, [sl, r0]
+
+	sub	r1, sl, r5		/* relocbase */
+	add	r0, r1, r0		/* &_DYNAMIC */
+	bl	_rtld_relocate_nonplt_self
+	mov	r1, sp
+	add	r2, sp, #4
+	mov	r0, r6		/* sp */
+	bl	_rtld			/* call the shared loader */
+	mov	r3, r0			/* save entry point */
+
+	ldr	r1, [sp, #0]		/* r2 = cleanup */
+	ldr	r0, [sp, #4]		/* r1 = obj_main */
+	add	sp, sp, #8		/* restore stack */
+	#if 0
+	mov	r0, r4			/* restore ps_strings */
+	#endif
+	mov	r2, #0
+	mov	pc, r3			/* jump to the entry point */
+.L2:
+	.word	_GLOBAL_OFFSET_TABLE_ - (.L1+8)
+	.word	_GLOBAL_OFFSET_TABLE_(GOT)
+	.word	_DYNAMIC(GOT)
+
+	.align	0
+	.globl	_rtld_bind_start
+	.type	_rtld_bind_start,%function
+/*
+ *	stack[0] = RA
+ *	ip = &GOT[n+3]
+ *	lr = &GOT[2]
+ */
+_rtld_bind_start:
+	stmdb	sp!,{r0-r4,sl,fp}
+
+	sub	r1, ip, lr		/* r1 = 4 * (n + 1) */
+	sub	r1, r1, #4		/* r1 = 4 * n */
+	add	r1, r1, r1		/* r1 = 8 * n */
+
+	ldr	r0, [lr, #-4]		/* get obj ptr from GOT[1] */
+	mov	r4, ip			/* save GOT location */
+
+	bl	_rtld_bind		/* Call the binder */
+
+	str	r0, [r4]		/* save address in GOT */
+	mov	ip, r0			/* save new address */
+
+	ldmia	sp!,{r0-r4,sl,fp,lr}	/* restore the stack */
+	mov	pc, ip			/* jump to the new address */
+