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Support binaries which use DT_GNU_HASH instead of DT_HASH.

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This commit is contained in:
pooka 2012-12-11 21:16:22 +00:00
parent 2db5317f2e
commit 4c7d25c0e6
1 changed files with 49 additions and 2 deletions
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51
lib/librumpuser/rumpuser_dl.c
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@ -1,4 +1,4 @@
/* $NetBSD: rumpuser_dl.c,v 1.10 2012/11/26 17:55:11 pooka Exp $ */
/* $NetBSD: rumpuser_dl.c,v 1.11 2012/12/11 21:16:22 pooka Exp $ */
/*
* Copyright (c) 2009 Antti Kantee. All Rights Reserved.
@ -33,7 +33,7 @@
#include "rumpuser_port.h"
#if !defined(lint)
__RCSID("$NetBSD: rumpuser_dl.c,v 1.10 2012/11/26 17:55:11 pooka Exp $");
__RCSID("$NetBSD: rumpuser_dl.c,v 1.11 2012/12/11 21:16:22 pooka Exp $");
#endif /* !lint */
#include <sys/types.h>
@ -213,6 +213,53 @@ getsymbols(struct link_map *map)
hashtab = (Elf_Symindx *)adjptr(map, edptr);
cursymcount = hashtab[1];
break;
#ifdef DT_GNU_HASH
/*
* DT_GNU_HASH is a bit more complicated than DT_HASH
* in this regard since apparently there is no field
* telling us the total symbol count. Instead, we look
* for the last valid hash bucket and add its chain lenght
* to the bucket's base index.
*/
case DT_GNU_HASH: {
Elf32_Word nbuck, symndx, maskwords, maxchain = 0;
Elf32_Word *gnuhash, *buckets, *ptr;
int bi;
DYNn_GETMEMBER(ed_base, i, d_un.d_ptr, edptr);
gnuhash = (Elf32_Word *)adjptr(map, edptr);
nbuck = gnuhash[0];
symndx = gnuhash[1];
maskwords = gnuhash[2];
/*
* First, find the last valid bucket and grab its index
*/
if (eident == ELFCLASS64)
maskwords *= 2; /* sizeof(*buckets) == 4 */
buckets = gnuhash + 4 + maskwords;
for (bi = nbuck-1; bi >= 0; bi--) {
if (buckets[bi] != 0) {
maxchain = buckets[bi];
break;
}
}
if (maxchain == 0 || maxchain < symndx)
break;
/*
* Then, traverse the last chain and count symbols.
*/
cursymcount = maxchain;
ptr = buckets + nbuck + (maxchain - symndx);
do {
cursymcount++;
} while ((*ptr++ & 1) == 0);
}
break;
#endif
case DT_SYMENT:
DYNn_GETMEMBER(ed_base, i, d_un.d_val, edval);
assert(edval == SYM_GETSIZE());