[Ltrace-devel] r50 - ltrace/trunk
Petr Machata
pmachata-guest at costa.debian.org
Tue Jul 18 10:58:12 UTC 2006
Author: pmachata-guest
Date: 2006-07-18 10:58:12 +0000 (Tue, 18 Jul 2006)
New Revision: 50
Modified:
ltrace/trunk/ChangeLog
ltrace/trunk/elf.c
ltrace/trunk/elf.h
Log:
.gnu.hash ELF support
Modified: ltrace/trunk/ChangeLog
===================================================================
--- ltrace/trunk/ChangeLog 2006-07-18 10:53:20 UTC (rev 49)
+++ ltrace/trunk/ChangeLog 2006-07-18 10:58:12 UTC (rev 50)
@@ -1,3 +1,8 @@
+2006-07-18 Petr Machata <pmachata at redhat.com>
+
+ * elf.c: support .gnu.hash ELF entry
+ * elf.h: likewise
+
2006-07-18 Petr Machata <pmachata at redhat.com>
* options.c: don't hardcode version number
Modified: ltrace/trunk/elf.c
===================================================================
--- ltrace/trunk/elf.c 2006-07-18 10:53:20 UTC (rev 49)
+++ ltrace/trunk/elf.c 2006-07-18 10:58:12 UTC (rev 50)
@@ -169,6 +169,8 @@
Elf_Data *data;
size_t j;
+ lte->hash_type = SHT_HASH;
+
data = elf_getdata(scn, NULL);
if (data == NULL || elf_getdata(scn, data) != NULL
|| data->d_off || data->d_size != shdr.sh_size)
@@ -209,6 +211,30 @@
error(EXIT_FAILURE, 0,
"Unknown .hash sh_entsize in \"%s\"",
filename);
+#ifdef SHT_GNU_HASH
+ } else if (shdr.sh_type == SHT_GNU_HASH
+ && lte->hash == NULL) {
+ Elf_Data *data;
+ size_t j;
+
+ lte->hash_type = SHT_GNU_HASH;
+
+ if (shdr.sh_entsize != 0
+ && shdr.sh_entsize != 4) {
+ error(EXIT_FAILURE, 0,
+ ".gnu.hash sh_entsize in \"%s\" should be 4, but is %d",
+ filename, shdr.sh_entsize);
+ }
+
+ data = elf_getdata(scn, NULL);
+ if (data == NULL || elf_getdata(scn, data) != NULL
+ || data->d_off || data->d_size != shdr.sh_size)
+ error(EXIT_FAILURE, 0,
+ "Couldn't get .gnu.hash data from \"%s\"",
+ filename);
+
+ lte->hash = (Elf32_Word *) data->d_buf;
+#endif
} else if (shdr.sh_type == SHT_PROGBITS
|| shdr.sh_type == SHT_NOBITS) {
if (strcmp(name, ".plt") == 0) {
@@ -301,33 +327,79 @@
{
size_t i;
unsigned long hash;
+#ifdef SHT_GNU_HASH
+ unsigned long gnu_hash;
+#endif
if (!library_num)
return 1;
hash = elf_hash((const unsigned char *)name);
+#ifdef SHT_GNU_HASH
+ gnu_hash = elf_gnu_hash((const unsigned char *)name);
+#endif
for (i = 1; i <= library_num; ++i) {
- Elf32_Word nbuckets, symndx;
- Elf32_Word *buckets, *chain;
-
if (lte[i].hash == NULL)
continue;
- nbuckets = lte[i].hash[0];
- buckets = <e[i].hash[2];
- chain = <e[i].hash[2 + nbuckets];
- for (symndx = buckets[hash % nbuckets];
- symndx != STN_UNDEF; symndx = chain[symndx]) {
- GElf_Sym sym;
+#ifdef SHT_GNU_HASH
+ if (lte[i].hash_type == SHT_GNU_HASH) {
+ Elf32_Word * hashbase = lte[i].hash;
+ Elf32_Word nbuckets = *hashbase++;
+ Elf32_Word symbias = *hashbase++;
+ Elf32_Word bitmask_nwords = *hashbase++;
+ Elf32_Word bitmask_idxbits = bitmask_nwords - 1;
+ Elf32_Word shift = *hashbase++;
+ Elf32_Word * buckets;
+ Elf32_Word * chain_zero;
+ Elf32_Word bucket;
- if (gelf_getsym(lte[i].dynsym, symndx, &sym) == NULL)
- error(EXIT_FAILURE, 0,
- "Couldn't get symbol from .dynsym");
+ hashbase += lte[i].ehdr.e_ident[EI_CLASS] * bitmask_nwords;
+ buckets = hashbase;
+ hashbase += nbuckets;
+ chain_zero = hashbase - symbias;
+ bucket = buckets[gnu_hash % nbuckets];
- if (sym.st_value != 0
- && sym.st_shndx != SHN_UNDEF
- && strcmp(name, lte[i].dynstr + sym.st_name) == 0)
- return 1;
+ if (bucket != 0) {
+ const Elf32_Word *hasharr = &chain_zero[bucket];
+ do
+ if ((*hasharr & ~1u) == (gnu_hash & ~1u)) {
+ int symidx = hasharr - chain_zero;
+ GElf_Sym sym;
+
+ if (gelf_getsym(lte[i].dynsym, symidx, &sym) == NULL)
+ error(EXIT_FAILURE, 0,
+ "Couldn't get symbol from .dynsym");
+
+ if (sym.st_value != 0
+ && sym.st_shndx != SHN_UNDEF
+ && strcmp(name, lte[i].dynstr + sym.st_name) == 0)
+ return 1;
+ }
+ while ((*hasharr++ & 1u) == 0);
+ }
+ } else
+#endif
+ {
+ Elf32_Word nbuckets, symndx;
+ Elf32_Word *buckets, *chain;
+ nbuckets = lte[i].hash[0];
+ buckets = <e[i].hash[2];
+ chain = <e[i].hash[2 + nbuckets];
+
+ for (symndx = buckets[hash % nbuckets];
+ symndx != STN_UNDEF; symndx = chain[symndx]) {
+ GElf_Sym sym;
+
+ if (gelf_getsym(lte[i].dynsym, symndx, &sym) == NULL)
+ error(EXIT_FAILURE, 0,
+ "Couldn't get symbol from .dynsym");
+
+ if (sym.st_value != 0
+ && sym.st_shndx != SHN_UNDEF
+ && strcmp(name, lte[i].dynstr + sym.st_name) == 0)
+ return 1;
+ }
}
}
return 0;
Modified: ltrace/trunk/elf.h
===================================================================
--- ltrace/trunk/elf.h 2006-07-18 10:53:20 UTC (rev 49)
+++ ltrace/trunk/elf.h 2006-07-18 10:58:12 UTC (rev 50)
@@ -24,6 +24,7 @@
GElf_Addr *opd_addr;
size_t opd_size;
Elf32_Word *hash;
+ int hash_type;
int lte_flags;
};
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