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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.
This commit is contained in:
matt 2013-04-24 22:32:29 +00:00
parent 63ebdd4153
commit e3feeaa73b
1 changed files with 86 additions and 0 deletions
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86
libexec/ld.elf_so/arch/arm/find_exidx.c Normal file
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/*-
* 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;
}