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authorThe Android Open Source Project <initial-contribution@android.com>2010-03-22 15:55:09 -0700
committerThe Android Open Source Project <initial-contribution@android.com>2010-03-22 15:55:09 -0700
commit377d4c979dee3dcb5929e8f7a68a53c2407259ab (patch)
tree1783fe0272f1437faabfe8365e615696eb8d374c /linker
parent709a898de82128c065381e258e8e71f0a55df976 (diff)
parent1825fb5d5f214849e39d95660795a0d3633f8eeb (diff)
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merge from open-source master
Change-Id: I70266ee8c520b216773f267e46c8273d2334c31d
Diffstat (limited to 'linker')
-rw-r--r--linker/dlfcn.c64
-rw-r--r--linker/linker.c34
-rw-r--r--linker/linker.h2
3 files changed, 86 insertions, 14 deletions
diff --git a/linker/dlfcn.c b/linker/dlfcn.c
index bc6b95a..10ecb13 100644
--- a/linker/dlfcn.c
+++ b/linker/dlfcn.c
@@ -118,6 +118,37 @@ err:
return 0;
}
+int dladdr(void *addr, Dl_info *info)
+{
+ int ret = 0;
+
+ pthread_mutex_lock(&dl_lock);
+
+ /* Determine if this address can be found in any library currently mapped */
+ soinfo *si = find_containing_library(addr);
+
+ if(si) {
+ memset(info, 0, sizeof(Dl_info));
+
+ info->dli_fname = si->name;
+ info->dli_fbase = (void*)si->base;
+
+ /* Determine if any symbol in the library contains the specified address */
+ Elf32_Sym *sym = find_containing_symbol(addr, si);
+
+ if(sym != NULL) {
+ info->dli_sname = si->strtab + sym->st_name;
+ info->dli_saddr = (void*)(si->base + sym->st_value);
+ }
+
+ ret = 1;
+ }
+
+ pthread_mutex_unlock(&dl_lock);
+
+ return ret;
+}
+
int dlclose(void *handle)
{
pthread_mutex_lock(&dl_lock);
@@ -127,22 +158,22 @@ int dlclose(void *handle)
}
#if defined(ANDROID_ARM_LINKER)
-// 0000000 00011111 111112 22222222 233333333334444444444
-// 0123456 78901234 567890 12345678 901234567890123456789
+// 0000000 00011111 111112 22222222 2333333 333344444444445555555
+// 0123456 78901234 567890 12345678 9012345 678901234567890123456
#define ANDROID_LIBDL_STRTAB \
- "dlopen\0dlclose\0dlsym\0dlerror\0dl_unwind_find_exidx\0"
+ "dlopen\0dlclose\0dlsym\0dlerror\0dladdr\0dl_unwind_find_exidx\0"
#elif defined(ANDROID_X86_LINKER)
-// 0000000 00011111 111112 22222222 2333333333344444
-// 0123456 78901234 567890 12345678 9012345678901234
+// 0000000 00011111 111112 22222222 2333333 3333444444444455
+// 0123456 78901234 567890 12345678 9012345 6789012345678901
#define ANDROID_LIBDL_STRTAB \
- "dlopen\0dlclose\0dlsym\0dlerror\0dl_iterate_phdr\0"
+ "dlopen\0dlclose\0dlsym\0dlerror\0dladdr\0dl_iterate_phdr\0"
#elif defined(ANDROID_SH_LINKER)
-// 0000000 00011111 111112 22222222 2333333333344444
-// 0123456 78901234 567890 12345678 9012345678901234
+// 0000000 00011111 111112 22222222 2333333 3333444444444455
+// 0123456 78901234 567890 12345678 9012345 6789012345678901
#define ANDROID_LIBDL_STRTAB \
- "dlopen\0dlclose\0dlsym\0dlerror\0dl_iterate_phdr\0"
+ "dlopen\0dlclose\0dlsym\0dlerror\0dladdr\0dl_iterate_phdr\0"
#else /* !defined(ANDROID_ARM_LINKER) && !defined(ANDROID_X86_LINKER) */
#error Unsupported architecture. Only ARM and x86 are presently supported.
@@ -176,20 +207,25 @@ static Elf32_Sym libdl_symtab[] = {
st_info: STB_GLOBAL << 4,
st_shndx: 1,
},
-#ifdef ANDROID_ARM_LINKER
{ st_name: 29,
+ st_value: (Elf32_Addr) &dladdr,
+ st_info: STB_GLOBAL << 4,
+ st_shndx: 1,
+ },
+#ifdef ANDROID_ARM_LINKER
+ { st_name: 36,
st_value: (Elf32_Addr) &dl_unwind_find_exidx,
st_info: STB_GLOBAL << 4,
st_shndx: 1,
},
#elif defined(ANDROID_X86_LINKER)
- { st_name: 29,
+ { st_name: 36,
st_value: (Elf32_Addr) &dl_iterate_phdr,
st_info: STB_GLOBAL << 4,
st_shndx: 1,
},
#elif defined(ANDROID_SH_LINKER)
- { st_name: 29,
+ { st_name: 36,
st_value: (Elf32_Addr) &dl_iterate_phdr,
st_info: STB_GLOBAL << 4,
st_shndx: 1,
@@ -217,7 +253,7 @@ static Elf32_Sym libdl_symtab[] = {
* stubbing them out in libdl.
*/
static unsigned libdl_buckets[1] = { 1 };
-static unsigned libdl_chains[6] = { 0, 2, 3, 4, 5, 0 };
+static unsigned libdl_chains[7] = { 0, 2, 3, 4, 5, 6, 0 };
soinfo libdl_info = {
name: "libdl.so",
@@ -227,7 +263,7 @@ soinfo libdl_info = {
symtab: libdl_symtab,
nbucket: 1,
- nchain: 6,
+ nchain: 7,
bucket: libdl_buckets,
chain: libdl_chains,
};
diff --git a/linker/linker.c b/linker/linker.c
index 7eb1ef9..5cc05e2 100644
--- a/linker/linker.c
+++ b/linker/linker.c
@@ -535,6 +535,40 @@ Elf32_Sym *lookup(const char *name, soinfo **found)
return NULL;
}
+soinfo *find_containing_library(void *addr)
+{
+ soinfo *si;
+
+ for(si = solist; si != NULL; si = si->next)
+ {
+ if((unsigned)addr >= si->base && (unsigned)addr - si->base < si->size) {
+ return si;
+ }
+ }
+
+ return NULL;
+}
+
+Elf32_Sym *find_containing_symbol(void *addr, soinfo *si)
+{
+ unsigned int i;
+ unsigned soaddr = (unsigned)addr - si->base;
+
+ /* Search the library's symbol table for any defined symbol which
+ * contains this address */
+ for(i=0; i<si->nchain; i++) {
+ Elf32_Sym *sym = &si->symtab[i];
+
+ if(sym->st_shndx != SHN_UNDEF &&
+ soaddr >= sym->st_value &&
+ soaddr < sym->st_value + sym->st_size) {
+ return sym;
+ }
+ }
+
+ return NULL;
+}
+
#if 0
static void dump(soinfo *si)
{
diff --git a/linker/linker.h b/linker/linker.h
index ec01489..8cd56b0 100644
--- a/linker/linker.h
+++ b/linker/linker.h
@@ -225,6 +225,8 @@ soinfo *find_library(const char *name);
unsigned unload_library(soinfo *si);
Elf32_Sym *lookup_in_library(soinfo *si, const char *name);
Elf32_Sym *lookup(const char *name, soinfo **found);
+soinfo *find_containing_library(void *addr);
+Elf32_Sym *find_containing_symbol(void *addr, soinfo *si);
const char *linker_get_error(void);
#ifdef ANDROID_ARM_LINKER