Module Name: src
Committed By: matt
Date: Wed Apr 24 22:32:29 UTC 2013
Added Files:
src/libexec/ld.elf_so/arch/arm: find_exidx.c
Log Message:
Add a ld.elf_so internals version of __gnu_Unwind_Find_exidx for that the
libgcc EHABI can find the exception tables for a supplied PC.
To generate a diff of this commit:
cvs rdiff -u -r0 -r1.1 src/libexec/ld.elf_so/arch/arm/find_exidx.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Added files:
Index: src/libexec/ld.elf_so/arch/arm/find_exidx.c
diff -u /dev/null src/libexec/ld.elf_so/arch/arm/find_exidx.c:1.1
--- /dev/null Wed Apr 24 22:32:30 2013
+++ src/libexec/ld.elf_so/arch/arm/find_exidx.c Wed Apr 24 22:32:29 2013
@@ -0,0 +1,86 @@
+/*-
+ * Copyright (c) 2013 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 <sys/cdefs.h>
+#ifndef lint
+__RCSID("$NetBSD: find_exidx.c,v 1.1 2013/04/24 22:32:29 matt Exp $");
+#endif /* not lint */
+
+#include "debug.h"
+#include "rtld.h"
+
+_Unwind_Ptr
+__gnu_Unwind_Find_exidx(_Unwind_Ptr pc, int * pcount)
+{
+ const Obj_Entry *obj;
+ _Unwind_Ptr start = NULL;
+ int count = 0;
+
+ dbg(("__gnu_Unwind_Find_exidx"));
+
+ _rtld_shared_enter();
+
+ vaddr_t va = (vaddr_t)pc;
+ for (obj = _rtld_objlist; obj != NULL; obj = obj->next) {
+ /*
+ * If the address we are looking for is inside this object,
+ * we've found the object to inspect.
+ */
+ if ((vaddr_t)obj->mapbase <= va
+ && va < (vaddr_t)obj->mapbase + obj->mapsize)
+ break;
+ }
+
+ /*
+ * If we found an object and it has some exception data, we
+ * need to see if the address matches a PT_LOAD section.
+ */
+ if (obj != NULL && obj->exidx_start != NULL) {
+ va -= (vaddr_t)obj->mapbase;
+ const Elf_Phdr *ph = obj->phdr;
+ const Elf_Phdr * const phlimit = ph + obj->phsize / sizeof(*ph);
+ for (; ph < phlimit; ph++) {
+ if (ph->p_type == PT_LOAD
+ && ph->p_vaddr <= va
+ && va < ph->p_vaddr + ph->p_memsz) {
+ count = obj->exidx_sz / 8;
+ start = obj->exidx_start;
+ break;
+ }
+ }
+ }
+
+ _rtld_shared_exit();
+
+ /*
+ * deal with the return values.
+ */
+ *pcount = count;
+ return start;
+}
