auto import from //depot/cupcake/@135843

1 files changed, 0 insertions, 212 deletions

diff --git a/linker/dlfcn.c b/linker/dlfcn.c
deleted file mode 100644
index cd73d11..0000000
--- a/linker/dlfcn.c
+++ /dev/null
@@ -1,212 +0,0 @@
-/*
- * Copyright (C) 2007 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-#include <dlfcn.h>
-#include <pthread.h>
-#include "linker.h"
-
-/* This file hijacks the symbols stubbed out in libdl.so. */
-
-#define DL_SUCCESS                    0
-#define DL_ERR_CANNOT_FIND_LIBRARY    1
-#define DL_ERR_INVALID_LIBRARY_HANDLE 2
-#define DL_ERR_BAD_SYMBOL_NAME        3
-#define DL_ERR_SYMBOL_NOT_FOUND       4
-#define DL_ERR_SYMBOL_NOT_GLOBAL      5
-
-static const char *dl_errors[] = {
-    [DL_SUCCESS] = NULL,
-    [DL_ERR_CANNOT_FIND_LIBRARY] = "Cannot find library",
-    [DL_ERR_INVALID_LIBRARY_HANDLE] = "Invalid library handle",
-    [DL_ERR_BAD_SYMBOL_NAME] = "Invalid symbol name",
-    [DL_ERR_SYMBOL_NOT_FOUND] = "Symbol not found",
-    [DL_ERR_SYMBOL_NOT_GLOBAL] = "Symbol is not global",
-};
-
-static int dl_last_err = DL_SUCCESS;
-
-#define likely(expr)   __builtin_expect (expr, 1)
-#define unlikely(expr) __builtin_expect (expr, 0)
-
-static pthread_mutex_t dl_lock = PTHREAD_MUTEX_INITIALIZER;
-
-void *dlopen(const char *filename, int flag) 
-{
-    soinfo *ret;
-
-    pthread_mutex_lock(&dl_lock);
-    ret = find_library(filename);
-    if (unlikely(ret == NULL)) {
-        dl_last_err = DL_ERR_CANNOT_FIND_LIBRARY;
-    } else {
-        ret->refcount++;
-    }
-    pthread_mutex_unlock(&dl_lock);
-    return ret;
-}
-
-const char *dlerror(void)
-{
-    const char *err = dl_errors[dl_last_err];
-    dl_last_err = DL_SUCCESS;
-    return err;
-}
-
-void *dlsym(void *handle, const char *symbol)
-{
-    unsigned base;
-    Elf32_Sym *sym;
-    unsigned bind;
-
-    pthread_mutex_lock(&dl_lock);
-    
-    if(unlikely(handle == 0)) { 
-        dl_last_err = DL_ERR_INVALID_LIBRARY_HANDLE;
-        goto err;
-    }
-    if(unlikely(symbol == 0)) {
-        dl_last_err = DL_ERR_BAD_SYMBOL_NAME;
-        goto err;
-    }
-    
-    if(handle == RTLD_DEFAULT) {
-        sym = lookup(symbol, &base);
-    } else if(handle == RTLD_NEXT) {
-        sym = lookup(symbol, &base);
-    } else {
-        sym = lookup_in_library((soinfo*) handle, symbol);
-        base = ((soinfo*) handle)->base;
-    }
-
-    if(likely(sym != 0)) {
-        bind = ELF32_ST_BIND(sym->st_info);
-    
-        if(likely((bind == STB_GLOBAL) && (sym->st_shndx != 0))) {
-            unsigned ret = sym->st_value + base;
-            pthread_mutex_unlock(&dl_lock);
-            return (void*)ret;
-        }
-
-        dl_last_err = DL_ERR_SYMBOL_NOT_GLOBAL;
-    }
-    else dl_last_err = DL_ERR_SYMBOL_NOT_FOUND;
-
-err:
-    pthread_mutex_unlock(&dl_lock);
-    return 0;
-}
-
-int dlclose(void *handle)
-{
-    pthread_mutex_lock(&dl_lock);
-    (void)unload_library((soinfo*)handle);
-    pthread_mutex_unlock(&dl_lock);
-    return 0;
-}
-
-#if defined(ANDROID_ARM_LINKER)
-//                     0000000 00011111 111112 22222222 233333333334444444444
-//                     0123456 78901234 567890 12345678 901234567890123456789
-#define ANDROID_LIBDL_STRTAB \
-                      "dlopen\0dlclose\0dlsym\0dlerror\0dl_unwind_find_exidx\0"
-
-#elif defined(ANDROID_X86_LINKER)
-//                     0000000 00011111 111112 22222222 2333333333344444
-//                     0123456 78901234 567890 12345678 9012345678901234
-#define ANDROID_LIBDL_STRTAB \
-                      "dlopen\0dlclose\0dlsym\0dlerror\0dl_iterate_phdr\0"
-
-#else /* !defined(ANDROID_ARM_LINKER) && !defined(ANDROID_X86_LINKER) */
-#error Unsupported architecture. Only ARM and x86 are presently supported.
-#endif
-
-
-static Elf32_Sym libdl_symtab[] = {
-      // total length of libdl_info.strtab, including trailing 0
-      // This is actually the the STH_UNDEF entry. Technically, it's
-      // supposed to have st_name == 0, but instead, it points to an index
-      // in the strtab with a \0 to make iterating through the symtab easier.
-    { st_name: sizeof(ANDROID_LIBDL_STRTAB) - 1,
-    },
-    { st_name: 0,   // starting index of the name in libdl_info.strtab
-      st_value: (Elf32_Addr) &dlopen,
-      st_info: STB_GLOBAL << 4,
-      st_shndx: 1,
-    },
-    { st_name: 7,
-      st_value: (Elf32_Addr) &dlclose,
-      st_info: STB_GLOBAL << 4,
-      st_shndx: 1,
-    },
-    { st_name: 15,
-      st_value: (Elf32_Addr) &dlsym,
-      st_info: STB_GLOBAL << 4,
-      st_shndx: 1,
-    },
-    { st_name: 21,
-      st_value: (Elf32_Addr) &dlerror,
-      st_info: STB_GLOBAL << 4,
-      st_shndx: 1,
-    },
-#ifdef ANDROID_ARM_LINKER
-    { st_name: 29,
-      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_value: (Elf32_Addr) &dl_iterate_phdr,
-      st_info: STB_GLOBAL << 4,
-      st_shndx: 1,
-    },
-#endif
-};
-
-/* Fake out a hash table with a single bucket.
- * A search of the hash table will look through
- * libdl_symtab starting with index [1], then
- * use libdl_chains to find the next index to
- * look at.  libdl_chains should be set up to
- * walk through every element in libdl_symtab,
- * and then end with 0 (sentinel value).
- *
- * I.e., libdl_chains should look like
- * { 0, 2, 3, ... N, 0 } where N is the number
- * of actual symbols, or nelems(libdl_symtab)-1
- * (since the first element of libdl_symtab is not
- * a real symbol).
- *
- * (see _elf_lookup())
- *
- * Note that adding any new symbols here requires
- * stubbing them out in libdl.
- */
-static unsigned libdl_buckets[1] = { 1 };
-static unsigned libdl_chains[6] = { 0, 2, 3, 4, 5, 0 };
-
-soinfo libdl_info = {
-    name: "libdl.so",
-    flags: FLAG_LINKED,
-
-    strtab: ANDROID_LIBDL_STRTAB,
-    symtab: libdl_symtab,
-
-    nbucket: 1,
-    nchain: 6,
-    bucket: libdl_buckets,
-    chain: libdl_chains,
-};
-