diff options
| author | The Android Open Source Project <initial-contribution@android.com> | 2009-03-03 18:28:13 -0800 |
|---|---|---|
| committer | The Android Open Source Project <initial-contribution@android.com> | 2009-03-03 18:28:13 -0800 |
| commit | 1767f908af327fa388b1c66883760ad851267013 (patch) | |
| tree | 4b825dc642cb6eb9a060e54bf8d69288fbee4904 /linker | |
| parent | a799b53f10e5a6fd51fef4436cfb7ec99836a516 (diff) | |
| download | bionic-1767f908af327fa388b1c66883760ad851267013.zip bionic-1767f908af327fa388b1c66883760ad851267013.tar.gz bionic-1767f908af327fa388b1c66883760ad851267013.tar.bz2 | |
auto import from //depot/cupcake/@135843
Diffstat (limited to 'linker')
| -rw-r--r-- | linker/Android.mk | 72 | ||||
| -rw-r--r-- | linker/MODULE_LICENSE_APACHE2 | 0 | ||||
| -rw-r--r-- | linker/NOTICE | 190 | ||||
| -rw-r--r-- | linker/arch/arm/begin.S | 45 | ||||
| -rw-r--r-- | linker/arch/x86/begin.S | 52 | ||||
| -rw-r--r-- | linker/debugger.c | 81 | ||||
| -rw-r--r-- | linker/dlfcn.c | 212 | ||||
| -rw-r--r-- | linker/linker.c | 1760 | ||||
| -rw-r--r-- | linker/linker.h | 213 | ||||
| -rw-r--r-- | linker/linker_debug.h | 141 | ||||
| -rw-r--r-- | linker/rt.c | 36 |
11 files changed, 0 insertions, 2802 deletions
diff --git a/linker/Android.mk b/linker/Android.mk deleted file mode 100644 index 98eceda..0000000 --- a/linker/Android.mk +++ /dev/null @@ -1,72 +0,0 @@ -LOCAL_PATH:= $(call my-dir) -include $(CLEAR_VARS) - -LOCAL_SRC_FILES:= \ - arch/$(TARGET_ARCH)/begin.S \ - linker.c \ - rt.c \ - dlfcn.c \ - debugger.c - -LINKER_TEXT_BASE := 0xB0000100 - -# The maximum size set aside for the linker, from -# LINKER_TEXT_BASE rounded down to a megabyte. -LINKER_AREA_SIZE := 0x01000000 - -LOCAL_LDFLAGS := -Wl,-Ttext,$(LINKER_TEXT_BASE) - -LOCAL_CFLAGS += -DPRELINK -DLINKER_TEXT_BASE=$(LINKER_TEXT_BASE) -DLINKER_AREA_SIZE=$(LINKER_AREA_SIZE) - -# we need to access the Bionic private header <bionic_tls.h> -# in the linker -LOCAL_CFLAGS += -I$(LOCAL_PATH)/../libc/private - -ifeq ($(TARGET_ARCH),arm) -LOCAL_CFLAGS += -DANDROID_ARM_LINKER -else - ifeq ($(TARGET_ARCH),x86) - LOCAL_CFLAGS += -DANDROID_X86_LINKER - else - $(error Unsupported TARGET_ARCH $(TARGET_ARCH)) - endif -endif - -LOCAL_MODULE:= linker - -LOCAL_STATIC_LIBRARIES := libcutils libc - -#LOCAL_FORCE_STATIC_EXECUTABLE := true # not necessary when not including BUILD_EXECUTABLE - -# -# include $(BUILD_EXECUTABLE) -# -# Instead of including $(BUILD_EXECUTABLE), we execute the steps to create an executable by -# hand, as we want to insert an extra step that is not supported by the build system, and -# is probably specific the linker only, so there's no need to modify the build system for -# the purpose. - -LOCAL_MODULE_CLASS := EXECUTABLES -LOCAL_MODULE_SUFFIX := $(TARGET_EXECUTABLE_SUFFIX) - -# Executables are not prelinked. -LOCAL_PRELINK_MODULE := false - -include $(BUILD_SYSTEM)/dynamic_binary.mk - -$(linked_module): $(TARGET_CRTBEGIN_STATIC_O) $(all_objects) $(all_libraries) $(TARGET_CRTEND_O) - $(transform-o-to-static-executable) - @echo "target PrefixSymbols: $(PRIVATE_MODULE) ($@)" - $(hide) $(TARGET_OBJCOPY) --prefix-symbols=__dl_ $@ - -# -# end of BUILD_EXECUTABLE hack -# - -# we don't want crtbegin.o (because we have begin.o), so unset it -# just for this module -$(LOCAL_BUILT_MODULE): TARGET_CRTBEGIN_STATIC_O := -# This line is not strictly necessary because the dynamic linker is built -# as a static executable, but it won't hurt if in the future we start -# building the linker as a dynamic one. -$(LOCAL_BUILT_MODULE): TARGET_CRTBEGIN_DYNAMIC_O := diff --git a/linker/MODULE_LICENSE_APACHE2 b/linker/MODULE_LICENSE_APACHE2 deleted file mode 100644 index e69de29..0000000 --- a/linker/MODULE_LICENSE_APACHE2 +++ /dev/null diff --git a/linker/NOTICE b/linker/NOTICE deleted file mode 100644 index c5b1efa..0000000 --- a/linker/NOTICE +++ /dev/null @@ -1,190 +0,0 @@ - - Copyright (c) 2005-2008, 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. - - 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. - - - Apache License - Version 2.0, January 2004 - http://www.apache.org/licenses/ - - TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION - - 1. Definitions. - - "License" shall mean the terms and conditions for use, reproduction, - and distribution as defined by Sections 1 through 9 of this document. - - "Licensor" shall mean the copyright owner or entity authorized by - the copyright owner that is granting the License. - - "Legal Entity" shall mean the union of the acting entity and all - other entities that control, are controlled by, or are under common - control with that entity. For the purposes of this definition, - "control" means (i) the power, direct or indirect, to cause the - direction or management of such entity, whether by contract or - otherwise, or (ii) ownership of fifty percent (50%) or more of the - outstanding shares, or (iii) beneficial ownership of such entity. - - "You" (or "Your") shall mean an individual or Legal Entity - exercising permissions granted by this License. - - "Source" form shall mean the preferred form for making modifications, - including but not limited to software source code, documentation - source, and configuration files. - - "Object" form shall mean any form resulting from mechanical - transformation or translation of a Source form, including but - not limited to compiled object code, generated documentation, - and conversions to other media types. - - "Work" shall mean the work of authorship, whether in Source or - Object form, made available under the License, as indicated by a - copyright notice that is included in or attached to the work - (an example is provided in the Appendix below). - - "Derivative Works" shall mean any work, whether in Source or Object - form, that is based on (or derived from) the Work and for which the - editorial revisions, annotations, elaborations, or other modifications - represent, as a whole, an original work of authorship. For the purposes - of this License, Derivative Works shall not include works that remain - separable from, or merely link (or bind by name) to the interfaces of, - the Work and Derivative Works thereof. - - "Contribution" shall mean any work of authorship, including - the original version of the Work and any modifications or additions - to that Work or Derivative Works thereof, that is intentionally - submitted to Licensor for inclusion in the Work by the copyright owner - or by an individual or Legal Entity authorized to submit on behalf of - the copyright owner. For the purposes of this definition, "submitted" - means any form of electronic, verbal, or written communication sent - to the Licensor or its representatives, including but not limited to - communication on electronic mailing lists, source code control systems, - and issue tracking systems that are managed by, or on behalf of, the - Licensor for the purpose of discussing and improving the Work, but - excluding communication that is conspicuously marked or otherwise - designated in writing by the copyright owner as "Not a Contribution." - - "Contributor" shall mean Licensor and any individual or Legal Entity - on behalf of whom a Contribution has been received by Licensor and - subsequently incorporated within the Work. - - 2. Grant of Copyright License. Subject to the terms and conditions of - this License, each Contributor hereby grants to You a perpetual, - worldwide, non-exclusive, no-charge, royalty-free, irrevocable - copyright license to reproduce, prepare Derivative Works of, - publicly display, publicly perform, sublicense, and distribute the - Work and such Derivative Works in Source or Object form. - - 3. Grant of Patent License. Subject to the terms and conditions of - this License, each Contributor hereby grants to You a perpetual, - worldwide, non-exclusive, no-charge, royalty-free, irrevocable - (except as stated in this section) patent license to make, have made, - use, offer to sell, sell, import, and otherwise transfer the Work, - where such license applies only to those patent claims licensable - by such Contributor that are necessarily infringed by their - Contribution(s) alone or by combination of their Contribution(s) - with the Work to which such Contribution(s) was submitted. If You - institute patent litigation against any entity (including a - cross-claim or counterclaim in a lawsuit) alleging that the Work - or a Contribution incorporated within the Work constitutes direct - or contributory patent infringement, then any patent licenses - granted to You under this License for that Work shall terminate - as of the date such litigation is filed. - - 4. Redistribution. You may reproduce and distribute copies of the - Work or Derivative Works thereof in any medium, with or without - modifications, and in Source or Object form, provided that You - meet the following conditions: - - (a) You must give any other recipients of the Work or - Derivative Works a copy of this License; and - - (b) You must cause any modified files to carry prominent notices - stating that You changed the files; and - - (c) You must retain, in the Source form of any Derivative Works - that You distribute, all copyright, patent, trademark, and - attribution notices from the Source form of the Work, - excluding those notices that do not pertain to any part of - the Derivative Works; and - - (d) If the Work includes a "NOTICE" text file as part of its - distribution, then any Derivative Works that You distribute must - include a readable copy of the attribution notices contained - within such NOTICE file, excluding those notices that do not - pertain to any part of the Derivative Works, in at least one - of the following places: within a NOTICE text file distributed - as part of the Derivative Works; within the Source form or - documentation, if provided along with the Derivative Works; or, - within a display generated by the Derivative Works, if and - wherever such third-party notices normally appear. The contents - of the NOTICE file are for informational purposes only and - do not modify the License. You may add Your own attribution - notices within Derivative Works that You distribute, alongside - or as an addendum to the NOTICE text from the Work, provided - that such additional attribution notices cannot be construed - as modifying the License. - - You may add Your own copyright statement to Your modifications and - may provide additional or different license terms and conditions - for use, reproduction, or distribution of Your modifications, or - for any such Derivative Works as a whole, provided Your use, - reproduction, and distribution of the Work otherwise complies with - the conditions stated in this License. - - 5. Submission of Contributions. Unless You explicitly state otherwise, - any Contribution intentionally submitted for inclusion in the Work - by You to the Licensor shall be under the terms and conditions of - this License, without any additional terms or conditions. - Notwithstanding the above, nothing herein shall supersede or modify - the terms of any separate license agreement you may have executed - with Licensor regarding such Contributions. - - 6. Trademarks. This License does not grant permission to use the trade - names, trademarks, service marks, or product names of the Licensor, - except as required for reasonable and customary use in describing the - origin of the Work and reproducing the content of the NOTICE file. - - 7. Disclaimer of Warranty. Unless required by applicable law or - agreed to in writing, Licensor provides the Work (and each - Contributor provides its Contributions) on an "AS IS" BASIS, - WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or - implied, including, without limitation, any warranties or conditions - of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A - PARTICULAR PURPOSE. You are solely responsible for determining the - appropriateness of using or redistributing the Work and assume any - risks associated with Your exercise of permissions under this License. - - 8. Limitation of Liability. In no event and under no legal theory, - whether in tort (including negligence), contract, or otherwise, - unless required by applicable law (such as deliberate and grossly - negligent acts) or agreed to in writing, shall any Contributor be - liable to You for damages, including any direct, indirect, special, - incidental, or consequential damages of any character arising as a - result of this License or out of the use or inability to use the - Work (including but not limited to damages for loss of goodwill, - work stoppage, computer failure or malfunction, or any and all - other commercial damages or losses), even if such Contributor - has been advised of the possibility of such damages. - - 9. Accepting Warranty or Additional Liability. While redistributing - the Work or Derivative Works thereof, You may choose to offer, - and charge a fee for, acceptance of support, warranty, indemnity, - or other liability obligations and/or rights consistent with this - License. However, in accepting such obligations, You may act only - on Your own behalf and on Your sole responsibility, not on behalf - of any other Contributor, and only if You agree to indemnify, - defend, and hold each Contributor harmless for any liability - incurred by, or claims asserted against, such Contributor by reason - of your accepting any such warranty or additional liability. - - END OF TERMS AND CONDITIONS - diff --git a/linker/arch/arm/begin.S b/linker/arch/arm/begin.S deleted file mode 100644 index e259902..0000000 --- a/linker/arch/arm/begin.S +++ /dev/null @@ -1,45 +0,0 @@ -/* - * Copyright (C) 2008 The Android Open Source Project - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * * Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * * 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 COPYRIGHT HOLDERS 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 - * COPYRIGHT OWNER 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. - */ - - .text - .align 4 - .type _start,#function - .globl _start - -_start: - mov r0, sp - mov r1, #0 - bl __linker_init - - /* linker init returns the _entry address in the main image */ - mov pc, r0 - - .section .ctors, "wa" - .globl __CTOR_LIST__ -__CTOR_LIST__: - .long -1 diff --git a/linker/arch/x86/begin.S b/linker/arch/x86/begin.S deleted file mode 100644 index d8a39ca..0000000 --- a/linker/arch/x86/begin.S +++ /dev/null @@ -1,52 +0,0 @@ -/* - * Copyright (C) 2008 The Android Open Source Project - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * * Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * * 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 COPYRIGHT HOLDERS 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 - * COPYRIGHT OWNER 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. - */ - -.text -.align 4 -.type _start, @function -.globl _start - -_start: - /* save the elfdata ptr to %eax, AND push it onto the stack */ - mov %esp, %eax - pushl %esp - - pushl %eax - call __linker_init - - /* linker init returns (%eax) the _entry address in the main image */ - /* entry point expects sp to point to elfdata */ - popl %esp - jmp *%eax - -.section .ctors, "wa" -.globl __CTOR_LIST__ - -__CTOR_LIST__: - .long -1 - diff --git a/linker/debugger.c b/linker/debugger.c deleted file mode 100644 index 5bb065c..0000000 --- a/linker/debugger.c +++ /dev/null @@ -1,81 +0,0 @@ -/* - * Copyright (C) 2008 The Android Open Source Project - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * * Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * * 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 COPYRIGHT HOLDERS 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 - * COPYRIGHT OWNER 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 <stdio.h> -#include <stdlib.h> -#include <unistd.h> -#include <ctype.h> -#include <signal.h> -#include <sys/mman.h> - -#include "linker.h" - -#include <sys/socket.h> -#include <cutils/sockets.h> - -void notify_gdb_of_libraries(); - -void debugger_signal_handler(int n) -{ - unsigned tid; - int s; - - /* avoid picking up GC interrupts */ - signal(SIGUSR1, SIG_IGN); - - tid = gettid(); - s = socket_local_client("android:debuggerd", - ANDROID_SOCKET_NAMESPACE_ABSTRACT, SOCK_STREAM); - - if(s >= 0) { - /* debugger knows our pid from the credentials on the - * local socket but we need to tell it our tid. It - * is paranoid and will verify that we are giving a tid - * that's actually in our process - */ - write(s, &tid, sizeof(unsigned)); - - read(s, &tid, 1); - notify_gdb_of_libraries(); - close(s); - } - - /* remove our net so we fault for real when we return */ - signal(n, SIG_IGN); -} - -void debugger_init() -{ - signal(SIGILL, debugger_signal_handler); - signal(SIGABRT, debugger_signal_handler); - signal(SIGBUS, debugger_signal_handler); - signal(SIGFPE, debugger_signal_handler); - signal(SIGSEGV, debugger_signal_handler); - signal(SIGSTKFLT, debugger_signal_handler); - signal(SIGPIPE, debugger_signal_handler); -} 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, -}; - diff --git a/linker/linker.c b/linker/linker.c deleted file mode 100644 index 7b19835..0000000 --- a/linker/linker.c +++ /dev/null @@ -1,1760 +0,0 @@ -/* - * Copyright (C) 2008 The Android Open Source Project - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * * Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * * 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 COPYRIGHT HOLDERS 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 - * COPYRIGHT OWNER 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 <linux/auxvec.h> - -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <unistd.h> -#include <fcntl.h> -#include <errno.h> -#include <dlfcn.h> -#include <sys/stat.h> - -//#include <pthread.h> - -#include <sys/mman.h> - -#include <sys/atomics.h> - -/* special private C library header - see Android.mk */ -#include <bionic_tls.h> - -#include "linker.h" -#include "linker_debug.h" - -#define SO_MAX 64 - -/* >>> IMPORTANT NOTE - READ ME BEFORE MODIFYING <<< - * - * Do NOT use malloc() and friends or pthread_*() code here. - * Don't use printf() either; it's caused mysterious memory - * corruption in the past. - * The linker runs before we bring up libc and it's easiest - * to make sure it does not depend on any complex libc features - * - * open issues / todo: - * - * - should we do anything special for STB_WEAK symbols? - * - are we doing everything we should for ARM_COPY relocations? - * - cleaner error reporting - * - configuration for paths (LD_LIBRARY_PATH?) - * - after linking, set as much stuff as possible to READONLY - * and NOEXEC - * - linker hardcodes PAGE_SIZE and PAGE_MASK because the kernel - * headers provide versions that are negative... - * - allocate space for soinfo structs dynamically instead of - * having a hard limit (64) - * - * features to add someday: - * - * - dlopen() and friends - * -*/ - - -static int link_image(soinfo *si, unsigned wr_offset); - -static int socount = 0; -static soinfo sopool[SO_MAX]; -static soinfo *freelist = NULL; -static soinfo *solist = &libdl_info; -static soinfo *sonext = &libdl_info; - -int debug_verbosity; -static int pid; - -#if STATS -struct _link_stats linker_stats; -#endif - -#if COUNT_PAGES -unsigned bitmask[4096]; -#endif - -#ifndef PT_ARM_EXIDX -#define PT_ARM_EXIDX 0x70000001 /* .ARM.exidx segment */ -#endif - -/* - * This function is an empty stub where GDB locates a breakpoint to get notified - * about linker activity. - */ -extern void __attribute__((noinline)) rtld_db_dlactivity(void); - -extern void sched_yield(void); - -static struct r_debug _r_debug = {1, NULL, &rtld_db_dlactivity, RT_CONSISTENT, 0}; -static struct link_map *r_debug_tail = 0; - -//static pthread_mutex_t _r_debug_lock = PTHREAD_MUTEX_INITIALIZER; - -static volatile int loader_lock = 0; - -static void insert_soinfo_into_debug_map(soinfo * info) -{ - struct link_map * map; - - /* Copy the necessary fields into the debug structure. - */ - map = &(info->linkmap); - map->l_addr = info->base; - map->l_name = (char*) info->name; - - /* Stick the new library at the end of the list. - * gdb tends to care more about libc than it does - * about leaf libraries, and ordering it this way - * reduces the back-and-forth over the wire. - */ - if (r_debug_tail) { - r_debug_tail->l_next = map; - map->l_prev = r_debug_tail; - map->l_next = 0; - } else { - _r_debug.r_map = map; - map->l_prev = 0; - map->l_next = 0; - } - r_debug_tail = map; -} - -void notify_gdb_of_load(soinfo * info) -{ - if (info->flags & FLAG_EXE) { - // GDB already knows about the main executable - return; - } - - /* yes, this is a little gross, but it does avoid - ** pulling in pthread_*() and at the moment we don't - ** dlopen() anything anyway - */ - while(__atomic_swap(1, &loader_lock) != 0) { - sched_yield(); - usleep(5000); - } - - _r_debug.r_state = RT_ADD; - rtld_db_dlactivity(); - - insert_soinfo_into_debug_map(info); - - _r_debug.r_state = RT_CONSISTENT; - rtld_db_dlactivity(); - - __atomic_swap(0, &loader_lock); -} - -void notify_gdb_of_libraries() -{ - _r_debug.r_state = RT_ADD; - rtld_db_dlactivity(); - _r_debug.r_state = RT_CONSISTENT; - rtld_db_dlactivity(); -} - -static soinfo *alloc_info(const char *name) -{ - soinfo *si; - - if(strlen(name) >= SOINFO_NAME_LEN) { - ERROR("%5d library name %s too long\n", pid, name); - return 0; - } - - /* The freelist is populated when we call free_info(), which in turn is - done only by dlclose(), which is not likely to be used. - */ - if (!freelist) { - if(socount == SO_MAX) { - ERROR("%5d too many libraries when loading %s\n", pid, name); - return NULL; - } - freelist = sopool + socount++; - freelist->next = NULL; - } - - si = freelist; - freelist = freelist->next; - - /* Make sure we get a clean block of soinfo */ - memset(si, 0, sizeof(soinfo)); - strcpy((char*) si->name, name); - sonext->next = si; - si->next = NULL; - si->refcount = 0; - sonext = si; - - TRACE("%5d name %s: allocated soinfo @ %p\n", pid, name, si); - return si; -} - -static void free_info(soinfo *si) -{ - soinfo *prev = NULL, *trav; - - TRACE("%5d name %s: freeing soinfo @ %p\n", pid, si->name, si); - - for(trav = solist; trav != NULL; trav = trav->next){ - if (trav == si) - break; - prev = trav; - } - if (trav == NULL) { - /* si was not ni solist */ - ERROR("%5d name %s is not in solist!\n", pid, si->name); - return; - } - - /* prev will never be NULL, because the first entry in solist is - always the static libdl_info. - */ - prev->next = si->next; - if (si == sonext) sonext = prev; - si->next = freelist; - freelist = si; -} - -#ifndef LINKER_TEXT_BASE -#error "linker's makefile must define LINKER_TEXT_BASE" -#endif -#ifndef LINKER_AREA_SIZE -#error "linker's makefile must define LINKER_AREA_SIZE" -#endif -#define LINKER_BASE ((LINKER_TEXT_BASE) & 0xfff00000) -#define LINKER_TOP (LINKER_BASE + (LINKER_AREA_SIZE)) - -const char *addr_to_name(unsigned addr) -{ - soinfo *si; - - for(si = solist; si != 0; si = si->next){ - if((addr >= si->base) && (addr < (si->base + si->size))) { - return si->name; - } - } - - if((addr >= LINKER_BASE) && (addr < LINKER_TOP)){ - return "linker"; - } - - return ""; -} - -/* For a given PC, find the .so that it belongs to. - * Returns the base address of the .ARM.exidx section - * for that .so, and the number of 8-byte entries - * in that section (via *pcount). - * - * Intended to be called by libc's __gnu_Unwind_Find_exidx(). - * - * This function is exposed via dlfcn.c and libdl.so. - */ -#ifdef ANDROID_ARM_LINKER -_Unwind_Ptr dl_unwind_find_exidx(_Unwind_Ptr pc, int *pcount) -{ - soinfo *si; - unsigned addr = (unsigned)pc; - - if ((addr < LINKER_BASE) || (addr >= LINKER_TOP)) { - for (si = solist; si != 0; si = si->next){ - if ((addr >= si->base) && (addr < (si->base + si->size))) { - *pcount = si->ARM_exidx_count; - return (_Unwind_Ptr)(si->base + (unsigned long)si->ARM_exidx); - } - } - } - *pcount = 0; - return NULL; -} -#elif defined(ANDROID_X86_LINKER) -/* Here, we only have to provide a callback to iterate across all the - * loaded libraries. gcc_eh does the rest. */ -int -dl_iterate_phdr(int (*cb)(struct dl_phdr_info *info, size_t size, void *data), - void *data) -{ - soinfo *si; - struct dl_phdr_info dl_info; - int rv = 0; - - for (si = solist; si != NULL; si = si->next) { - dl_info.dlpi_addr = si->linkmap.l_addr; - dl_info.dlpi_name = si->linkmap.l_name; - dl_info.dlpi_phdr = si->phdr; - dl_info.dlpi_phnum = si->phnum; - rv = cb(&dl_info, sizeof (struct dl_phdr_info), data); - if (rv != 0) - break; - } - return rv; -} -#endif - -static Elf32_Sym *_elf_lookup(soinfo *si, unsigned hash, const char *name) -{ - Elf32_Sym *s; - Elf32_Sym *symtab = si->symtab; - const char *strtab = si->strtab; - unsigned n; - - TRACE_TYPE(LOOKUP, "%5d SEARCH %s in %s@0x%08x %08x %d\n", pid, - name, si->name, si->base, hash, hash % si->nbucket); - n = hash % si->nbucket; - - for(n = si->bucket[hash % si->nbucket]; n != 0; n = si->chain[n]){ - s = symtab + n; - if(strcmp(strtab + s->st_name, name)) continue; - - /* only concern ourselves with global symbols */ - switch(ELF32_ST_BIND(s->st_info)){ - case STB_GLOBAL: - /* no section == undefined */ - if(s->st_shndx == 0) continue; - - case STB_WEAK: - TRACE_TYPE(LOOKUP, "%5d FOUND %s in %s (%08x) %d\n", pid, - name, si->name, s->st_value, s->st_size); - return s; - } - } - - return 0; -} - -static unsigned elfhash(const char *_name) -{ - const unsigned char *name = (const unsigned char *) _name; - unsigned h = 0, g; - - while(*name) { - h = (h << 4) + *name++; - g = h & 0xf0000000; - h ^= g; - h ^= g >> 24; - } - return h; -} - -static Elf32_Sym * -_do_lookup_in_so(soinfo *si, const char *name, unsigned *elf_hash) -{ - if (*elf_hash == 0) - *elf_hash = elfhash(name); - return _elf_lookup (si, *elf_hash, name); -} - -/* This is used by dl_sym() */ -Elf32_Sym *lookup_in_library(soinfo *si, const char *name) -{ - unsigned unused = 0; - return _do_lookup_in_so(si, name, &unused); -} - -static Elf32_Sym * -_do_lookup(soinfo *user_si, const char *name, unsigned *base) -{ - unsigned elf_hash = 0; - Elf32_Sym *s = NULL; - soinfo *si; - - /* Look for symbols in the local scope first (the object who is - * searching). This happens with C++ templates on i386 for some - * reason. */ - if (user_si) { - s = _do_lookup_in_so(user_si, name, &elf_hash); - if (s != NULL) - *base = user_si->base; - } - - for(si = solist; (s == NULL) && (si != NULL); si = si->next) - { - if((si->flags & FLAG_ERROR) || (si == user_si)) - continue; - s = _do_lookup_in_so(si, name, &elf_hash); - if (s != NULL) { - *base = si->base; - break; - } - } - - if (s != NULL) { - TRACE_TYPE(LOOKUP, "%5d %s s->st_value = 0x%08x, " - "si->base = 0x%08x\n", pid, name, s->st_value, si->base); - return s; - } - - return 0; -} - -/* This is used by dl_sym() */ -Elf32_Sym *lookup(const char *name, unsigned *base) -{ - return _do_lookup(NULL, name, base); -} - -#if 0 -static void dump(soinfo *si) -{ - Elf32_Sym *s = si->symtab; - unsigned n; - - for(n = 0; n < si->nchain; n++) { - TRACE("%5d %04d> %08x: %02x %04x %08x %08x %s\n", pid, n, s, - s->st_info, s->st_shndx, s->st_value, s->st_size, - si->strtab + s->st_name); - s++; - } -} -#endif - -static const char *sopaths[] = { - "/system/lib", - "/lib", - 0 -}; - -static int _open_lib(const char *name) -{ - int fd; - struct stat filestat; - - if ((stat(name, &filestat) >= 0) && S_ISREG(filestat.st_mode)) { - if ((fd = open(name, O_RDONLY)) >= 0) - return fd; - } - - return -1; -} - -/* TODO: Need to add support for initializing the so search path with - * LD_LIBRARY_PATH env variable for non-setuid programs. */ -static int open_library(const char *name) -{ - int fd; - char buf[512]; - const char **path; - - TRACE("[ %5d opening %s ]\n", pid, name); - - if(name == 0) return -1; - if(strlen(name) > 256) return -1; - - if ((name[0] == '/') && ((fd = _open_lib(name)) >= 0)) - return fd; - - for (path = sopaths; *path; path++) { - snprintf(buf, sizeof(buf), "%s/%s", *path, name); - if ((fd = _open_lib(buf)) >= 0) - return fd; - } - - return -1; -} - -static unsigned libbase = LIBBASE; - -/* temporary space for holding the first page of the shared lib - * which contains the elf header (with the pht). */ -static unsigned char __header[PAGE_SIZE]; - -typedef struct { - long mmap_addr; - char tag[4]; /* 'P', 'R', 'E', ' ' */ -} prelink_info_t; - -/* Returns the requested base address if the library is prelinked, - * and 0 otherwise. */ -static unsigned long -is_prelinked(int fd, const char *name) -{ - off_t sz; - prelink_info_t info; - - sz = lseek(fd, -sizeof(prelink_info_t), SEEK_END); - if (sz < 0) { - ERROR("lseek() failed!\n"); - return 0; - } - - if (read(fd, &info, sizeof(info)) != sizeof(info)) { - WARN("Could not read prelink_info_t structure for `%s`\n", name); - return 0; - } - - if (strncmp(info.tag, "PRE ", 4)) { - WARN("`%s` is not a prelinked library\n", name); - return 0; - } - - return (unsigned long)info.mmap_addr; -} - -/* verify_elf_object - * Verifies if the object @ base is a valid ELF object - * - * Args: - * - * Returns: - * 0 on success - * -1 if no valid ELF object is found @ base. - */ -static int -verify_elf_object(void *base, const char *name) -{ - Elf32_Ehdr *hdr = (Elf32_Ehdr *) base; - - if (hdr->e_ident[EI_MAG0] != ELFMAG0) return -1; - if (hdr->e_ident[EI_MAG1] != ELFMAG1) return -1; - if (hdr->e_ident[EI_MAG2] != ELFMAG2) return -1; - if (hdr->e_ident[EI_MAG3] != ELFMAG3) return -1; - - /* TODO: Should we verify anything else in the header? */ - - return 0; -} - - -/* get_lib_extents - * Retrieves the base (*base) address where the ELF object should be - * mapped and its overall memory size (*total_sz). - * - * Args: - * fd: Opened file descriptor for the library - * name: The name of the library - * _hdr: Pointer to the header page of the library - * total_sz: Total size of the memory that should be allocated for - * this library - * - * Returns: - * -1 if there was an error while trying to get the lib extents. - * The possible reasons are: - * - Could not determine if the library was prelinked. - * - The library provided is not a valid ELF object - * 0 if the library did not request a specific base offset (normal - * for non-prelinked libs) - * > 0 if the library requests a specific address to be mapped to. - * This indicates a pre-linked library. - */ -static unsigned -get_lib_extents(int fd, const char *name, void *__hdr, unsigned *total_sz) -{ - unsigned req_base; - unsigned min_vaddr = 0xffffffff; - unsigned max_vaddr = 0; - unsigned char *_hdr = (unsigned char *)__hdr; - Elf32_Ehdr *ehdr = (Elf32_Ehdr *)_hdr; - Elf32_Phdr *phdr; - int cnt; - - TRACE("[ %5d Computing extents for '%s'. ]\n", pid, name); - if (verify_elf_object(_hdr, name) < 0) { - ERROR("%5d - %s is not a valid ELF object\n", pid, name); - return (unsigned)-1; - } - - req_base = (unsigned) is_prelinked(fd, name); - if (req_base == (unsigned)-1) - return -1; - else if (req_base != 0) { - TRACE("[ %5d - Prelinked library '%s' requesting base @ 0x%08x ]\n", - pid, name, req_base); - } else { - TRACE("[ %5d - Non-prelinked library '%s' found. ]\n", pid, name); - } - - phdr = (Elf32_Phdr *)(_hdr + ehdr->e_phoff); - - /* find the min/max p_vaddrs from all the PT_LOAD segments so we can - * get the range. */ - for (cnt = 0; cnt < ehdr->e_phnum; ++cnt, ++phdr) { - if (phdr->p_type == PT_LOAD) { - if ((phdr->p_vaddr + phdr->p_memsz) > max_vaddr) - max_vaddr = phdr->p_vaddr + phdr->p_memsz; - if (phdr->p_vaddr < min_vaddr) - min_vaddr = phdr->p_vaddr; - } - } - - if ((min_vaddr == 0xffffffff) && (max_vaddr == 0)) { - ERROR("%5d - No loadable segments found in %s.\n", pid, name); - return (unsigned)-1; - } - - /* truncate min_vaddr down to page boundary */ - min_vaddr &= ~PAGE_MASK; - - /* round max_vaddr up to the next page */ - max_vaddr = (max_vaddr + PAGE_SIZE - 1) & ~PAGE_MASK; - - *total_sz = (max_vaddr - min_vaddr); - return (unsigned)req_base; -} - -/* alloc_mem_region - * - * This function reserves a chunk of memory to be used for mapping in - * the shared library. We reserve the entire memory region here, and - * then the rest of the linker will relocate the individual loadable - * segments into the correct locations within this memory range. - * - * Args: - * req_base: The requested base of the allocation. If 0, a sane one will be - * chosen in the range LIBBASE <= base < LIBLAST. - * sz: The size of the allocation. - * - * Returns: - * NULL on failure, and non-NULL pointer to memory region on success. - */ -static void * -alloc_mem_region(const char *name, unsigned req_base, unsigned sz) -{ - void *base; - - if (req_base) { - /* we should probably map it as PROT_NONE, but the init code needs - * to read the phdr, so mark everything as readable. */ - base = mmap((void *)req_base, sz, PROT_READ | PROT_EXEC, - MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); - if (base == MAP_FAILED) { - WARN("%5d can NOT map (prelinked) library '%s' at 0x%08x " - "as requested, will try general pool: %d (%s)\n", - pid, name, req_base, errno, strerror(errno)); - } else if (base != (void *)req_base) { - ERROR("OOPS: %5d prelinked library '%s' mapped at 0x%08x, " - "not at 0x%08x\n", pid, name, (unsigned)base, req_base); - munmap(base, sz); - return NULL; - } - - /* Here we know that we got a valid allocation. Hooray! */ - return base; - } - - /* We either did not request a specific base address to map at - * (i.e. not-prelinked) OR we could not map at the requested address. - * Try to find a memory range in our "reserved" area that can be mapped. - */ - while(libbase < LIBLAST) { - base = mmap((void*) libbase, sz, PROT_READ | PROT_EXEC, - MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); - - if(((unsigned)base) == libbase) { - /* success -- got the address we wanted */ - return base; - } - - /* If we got a different address than requested (rather than - * just a failure), we need to unmap the mismapped library - * before trying again - */ - if(base != MAP_FAILED) - munmap(base, sz); - - libbase += LIBINC; - } - - ERROR("OOPS: %5d cannot map library '%s'. no vspace available.\n", - pid, name); - return NULL; -} - -#define MAYBE_MAP_FLAG(x,from,to) (((x) & (from)) ? (to) : 0) -#define PFLAGS_TO_PROT(x) (MAYBE_MAP_FLAG((x), PF_X, PROT_EXEC) | \ - MAYBE_MAP_FLAG((x), PF_R, PROT_READ) | \ - MAYBE_MAP_FLAG((x), PF_W, PROT_WRITE)) -/* load_segments - * - * This function loads all the loadable (PT_LOAD) segments into memory - * at their appropriate memory offsets off the base address. - * - * Args: - * fd: Open file descriptor to the library to load. - * header: Pointer to a header page that contains the ELF header. - * This is needed since we haven't mapped in the real file yet. - * si: ptr to soinfo struct describing the shared object. - * - * Returns: - * 0 on success, -1 on failure. - */ -static int -load_segments(int fd, void *header, soinfo *si) -{ - Elf32_Ehdr *ehdr = (Elf32_Ehdr *)header; - Elf32_Phdr *phdr = (Elf32_Phdr *)((unsigned char *)header + ehdr->e_phoff); - unsigned char *base = (unsigned char *)si->base; - int cnt; - unsigned len; - unsigned char *tmp; - unsigned char *pbase; - unsigned char *extra_base; - unsigned extra_len; - unsigned total_sz = 0; - - si->wrprotect_start = 0xffffffff; - si->wrprotect_end = 0; - - TRACE("[ %5d - Begin loading segments for '%s' @ 0x%08x ]\n", - pid, si->name, (unsigned)si->base); - /* Now go through all the PT_LOAD segments and map them into memory - * at the appropriate locations. */ - for (cnt = 0; cnt < ehdr->e_phnum; ++cnt, ++phdr) { - if (phdr->p_type == PT_LOAD) { - DEBUG_DUMP_PHDR(phdr, "PT_LOAD", pid); - /* we want to map in the segment on a page boundary */ - tmp = base + (phdr->p_vaddr & (~PAGE_MASK)); - /* add the # of bytes we masked off above to the total length. */ - len = phdr->p_filesz + (phdr->p_vaddr & PAGE_MASK); - - TRACE("[ %d - Trying to load segment from '%s' @ 0x%08x " - "(0x%08x). p_vaddr=0x%08x p_offset=0x%08x ]\n", pid, si->name, - (unsigned)tmp, len, phdr->p_vaddr, phdr->p_offset); - pbase = mmap(tmp, len, PFLAGS_TO_PROT(phdr->p_flags), - MAP_PRIVATE | MAP_FIXED, fd, - phdr->p_offset & (~PAGE_MASK)); - if (pbase == MAP_FAILED) { - ERROR("%d failed to map segment from '%s' @ 0x%08x (0x%08x). " - "p_vaddr=0x%08x p_offset=0x%08x\n", pid, si->name, - (unsigned)tmp, len, phdr->p_vaddr, phdr->p_offset); - goto fail; - } - - /* If 'len' didn't end on page boundary, and it's a writable - * segment, zero-fill the rest. */ - if ((len & PAGE_MASK) && (phdr->p_flags & PF_W)) - memset((void *)(pbase + len), 0, PAGE_SIZE - (len & PAGE_MASK)); - - /* Check to see if we need to extend the map for this segment to - * cover the diff between filesz and memsz (i.e. for bss). - * - * base _+---------------------+ page boundary - * . . - * | | - * . . - * pbase _+---------------------+ page boundary - * | | - * . . - * base + p_vaddr _| | - * . \ \ . - * . | filesz | . - * pbase + len _| / | | - * <0 pad> . . . - * extra_base _+------------|--------+ page boundary - * / . . . - * | . . . - * | +------------|--------+ page boundary - * extra_len-> | | | | - * | . | memsz . - * | . | . - * \ _| / | - * . . - * | | - * _+---------------------+ page boundary - */ - tmp = (unsigned char *)(((unsigned)pbase + len + PAGE_SIZE - 1) & - (~PAGE_MASK)); - if (tmp < (base + phdr->p_vaddr + phdr->p_memsz)) { - extra_len = base + phdr->p_vaddr + phdr->p_memsz - tmp; - TRACE("[ %5d - Need to extend segment from '%s' @ 0x%08x " - "(0x%08x) ]\n", pid, si->name, (unsigned)tmp, extra_len); - /* map in the extra page(s) as anonymous into the range. - * This is probably not necessary as we already mapped in - * the entire region previously, but we just want to be - * sure. This will also set the right flags on the region - * (though we can probably accomplish the same thing with - * mprotect). - */ - extra_base = mmap((void *)tmp, extra_len, - PFLAGS_TO_PROT(phdr->p_flags), - MAP_PRIVATE | MAP_FIXED | MAP_ANONYMOUS, - -1, 0); - if (extra_base == MAP_FAILED) { - ERROR("[ %5d - failed to extend segment from '%s' @ 0x%08x " - "(0x%08x) ]\n", pid, si->name, (unsigned)tmp, - extra_len); - goto fail; - } - /* TODO: Check if we need to memset-0 this region. - * Anonymous mappings are zero-filled copy-on-writes, so we - * shouldn't need to. */ - TRACE("[ %5d - Segment from '%s' extended @ 0x%08x " - "(0x%08x)\n", pid, si->name, (unsigned)extra_base, - extra_len); - } - /* set the len here to show the full extent of the segment we - * just loaded, mostly for debugging */ - len = (((unsigned)base + phdr->p_vaddr + phdr->p_memsz + - PAGE_SIZE - 1) & (~PAGE_MASK)) - (unsigned)pbase; - TRACE("[ %5d - Successfully loaded segment from '%s' @ 0x%08x " - "(0x%08x). p_vaddr=0x%08x p_offset=0x%08x\n", pid, si->name, - (unsigned)pbase, len, phdr->p_vaddr, phdr->p_offset); - total_sz += len; - /* Make the section writable just in case we'll have to write to - * it during relocation (i.e. text segment). However, we will - * remember what range of addresses should be write protected. - * - */ - if (!(phdr->p_flags & PF_W)) { - if ((unsigned)pbase < si->wrprotect_start) - si->wrprotect_start = (unsigned)pbase; - if (((unsigned)pbase + len) > si->wrprotect_end) - si->wrprotect_end = (unsigned)pbase + len; - mprotect(pbase, len, - PFLAGS_TO_PROT(phdr->p_flags) | PROT_WRITE); - } - } else if (phdr->p_type == PT_DYNAMIC) { - DEBUG_DUMP_PHDR(phdr, "PT_DYNAMIC", pid); - /* this segment contains the dynamic linking information */ - si->dynamic = (unsigned *)(base + phdr->p_vaddr); - } else { -#ifdef ANDROID_ARM_LINKER - if (phdr->p_type == PT_ARM_EXIDX) { - DEBUG_DUMP_PHDR(phdr, "PT_ARM_EXIDX", pid); - /* exidx entries (used for stack unwinding) are 8 bytes each. - */ - si->ARM_exidx = (unsigned *)phdr->p_vaddr; - si->ARM_exidx_count = phdr->p_memsz / 8; - } -#endif - } - - } - - /* Sanity check */ - if (total_sz > si->size) { - ERROR("%5d - Total length (0x%08x) of mapped segments from '%s' is " - "greater than what was allocated (0x%08x). THIS IS BAD!\n", - pid, total_sz, si->name, si->size); - goto fail; - } - - TRACE("[ %5d - Finish loading segments for '%s' @ 0x%08x. " - "Total memory footprint: 0x%08x bytes ]\n", pid, si->name, - (unsigned)si->base, si->size); - return 0; - -fail: - /* We can just blindly unmap the entire region even though some things - * were mapped in originally with anonymous and others could have been - * been mapped in from the file before we failed. The kernel will unmap - * all the pages in the range, irrespective of how they got there. - */ - munmap((void *)si->base, si->size); - si->flags |= FLAG_ERROR; - return -1; -} - -/* TODO: Implement this to take care of the fact that Android ARM - * ELF objects shove everything into a single loadable segment that has the - * write bit set. wr_offset is then used to set non-(data|bss) pages to be - * non-writable. - */ -#if 0 -static unsigned -get_wr_offset(int fd, const char *name, Elf32_Ehdr *ehdr) -{ - Elf32_Shdr *shdr_start; - Elf32_Shdr *shdr; - int shdr_sz = ehdr->e_shnum * sizeof(Elf32_Shdr); - int cnt; - unsigned wr_offset = 0xffffffff; - - shdr_start = mmap(0, shdr_sz, PROT_READ, MAP_PRIVATE, fd, - ehdr->e_shoff & (~PAGE_MASK)); - if (shdr_start == MAP_FAILED) { - WARN("%5d - Could not read section header info from '%s'. Will not " - "not be able to determine write-protect offset.\n", pid, name); - return (unsigned)-1; - } - - for(cnt = 0, shdr = shdr_start; cnt < ehdr->e_shnum; ++cnt, ++shdr) { - if ((shdr->sh_type != SHT_NULL) && (shdr->sh_flags & SHF_WRITE) && - (shdr->sh_addr < wr_offset)) { - wr_offset = shdr->sh_addr; - } - } - - munmap(shdr_start, shdr_sz); - return wr_offset; -} -#endif - -static soinfo * -load_library(const char *name) -{ - int fd = open_library(name); - int cnt; - unsigned ext_sz; - unsigned req_base; - void *base; - soinfo *si; - Elf32_Ehdr *hdr; - - if(fd == -1) - return NULL; - - /* We have to read the ELF header to figure out what to do with this image - */ - if (lseek(fd, 0, SEEK_SET) < 0) { - ERROR("lseek() failed!\n"); - goto fail; - } - - if ((cnt = read(fd, &__header[0], PAGE_SIZE)) < 0) { - ERROR("read() failed!\n"); - goto fail; - } - - /* Parse the ELF header and get the size of the memory footprint for - * the library */ - req_base = get_lib_extents(fd, name, &__header[0], &ext_sz); - if (req_base == (unsigned)-1) - goto fail; - TRACE("[ %5d - '%s' (%s) wants base=0x%08x sz=0x%08x ]\n", pid, name, - (req_base ? "prelinked" : "not pre-linked"), req_base, ext_sz); - - /* Carve out a chunk of memory where we will map in the individual - * segments */ - base = alloc_mem_region(name, req_base, ext_sz); - if (base == NULL) - goto fail; - TRACE("[ %5d allocated memory for %s @ %p (0x%08x) ]\n", - pid, name, base, (unsigned) ext_sz); - - /* Now configure the soinfo struct where we'll store all of our data - * for the ELF object. If the loading fails, we waste the entry, but - * same thing would happen if we failed during linking. Configuring the - * soinfo struct here is a lot more convenient. - */ - si = alloc_info(name); - if (si == NULL) - goto fail; - - si->base = (unsigned)base; - si->size = ext_sz; - si->flags = 0; - si->entry = 0; - si->dynamic = (unsigned *)-1; - - /* Now actually load the library's segments into right places in memory */ - if (load_segments(fd, &__header[0], si) < 0) - goto fail; - - /* this might not be right. Technically, we don't even need this info - * once we go through 'load_segments'. */ - hdr = (Elf32_Ehdr *)base; - si->phdr = (Elf32_Phdr *)((unsigned char *)si->base + hdr->e_phoff); - si->phnum = hdr->e_phnum; - /**/ - - close(fd); - return si; - -fail: - close(fd); - return NULL; -} - -static soinfo * -init_library(soinfo *si) -{ - unsigned wr_offset = 0xffffffff; - unsigned libbase_before = 0; - unsigned libbase_after = 0; - - /* At this point we know that whatever is loaded @ base is a valid ELF - * shared library whose segments are properly mapped in. */ - TRACE("[ %5d init_library base=0x%08x sz=0x%08x name='%s') ]\n", - pid, si->base, si->size, si->name); - - if (si->base < LIBBASE || si->base >= LIBLAST) - si->flags |= FLAG_PRELINKED; - - /* Adjust libbase for the size of this library, rounded up to - ** LIBINC alignment. Make note of the previous and current - ** value of libbase to allow us to roll back in the event of - ** a link failure. - */ - if (!(si->flags & FLAG_PRELINKED)) { - libbase_before = libbase; - libbase += (si->size + (LIBINC - 1)) & (~(LIBINC - 1)); - libbase_after = libbase; - } - - if(link_image(si, wr_offset)) { - /* We failed to link. However, we can only restore libbase - ** if no additional libraries have moved it since we updated it. - */ - if(!(si->flags & FLAG_PRELINKED) && (libbase == libbase_after)) { - libbase = libbase_before; - } - munmap((void *)si->base, si->size); - return NULL; - } - - return si; -} - -soinfo *find_library(const char *name) -{ - soinfo *si; - - for(si = solist; si != 0; si = si->next){ - if(!strcmp(name, si->name)) { - if(si->flags & FLAG_ERROR) return 0; - if(si->flags & FLAG_LINKED) return si; - ERROR("OOPS: %5d recursive link to '%s'\n", pid, si->name); - return 0; - } - } - - TRACE("[ %5d '%s' has not been loaded yet. Locating...]\n", pid, name); - si = load_library(name); - if(si == NULL) - return NULL; - return init_library(si); -} - -/* TODO: - * notify gdb of unload - * for non-prelinked libraries, find a way to decrement libbase - */ -static void call_destructors(soinfo *si); -unsigned unload_library(soinfo *si) -{ - unsigned *d; - if (si->refcount == 1) { - TRACE("%5d unloading '%s'\n", pid, si->name); - call_destructors(si); - - for(d = si->dynamic; *d; d += 2) { - if(d[0] == DT_NEEDED){ - TRACE("%5d %s needs to unload %s\n", pid, - si->name, si->strtab + d[1]); - soinfo *lsi = find_library(si->strtab + d[1]); - if(lsi) - unload_library(lsi); - else - ERROR("%5d could not unload '%s'\n", - pid, si->strtab + d[1]); - } - } - - munmap((char *)si->base, si->size); - free_info(si); - si->refcount = 0; - } - else { - si->refcount--; - PRINT("%5d not unloading '%s', decrementing refcount to %d\n", - pid, si->name, si->refcount); - } - return si->refcount; -} - -/* TODO: don't use unsigned for addrs below. It works, but is not - * ideal. They should probably be either uint32_t, Elf32_Addr, or unsigned - * long. - */ -static int reloc_library(soinfo *si, Elf32_Rel *rel, unsigned count) -{ - Elf32_Sym *symtab = si->symtab; - const char *strtab = si->strtab; - Elf32_Sym *s; - unsigned base; - Elf32_Rel *start = rel; - unsigned idx; - - for (idx = 0; idx < count; ++idx) { - unsigned type = ELF32_R_TYPE(rel->r_info); - unsigned sym = ELF32_R_SYM(rel->r_info); - unsigned reloc = (unsigned)(rel->r_offset + si->base); - unsigned sym_addr = 0; - char *sym_name = NULL; - - DEBUG("%5d Processing '%s' relocation at index %d\n", pid, - si->name, idx); - if(sym != 0) { - s = _do_lookup(si, strtab + symtab[sym].st_name, &base); - if(s == 0) { - ERROR("%5d cannot locate '%s'...\n", pid, sym_name); - return -1; - } -#if 0 - if((base == 0) && (si->base != 0)){ - /* linking from libraries to main image is bad */ - ERROR("%5d cannot locate '%s'...\n", - pid, strtab + symtab[sym].st_name); - return -1; - } -#endif - if ((s->st_shndx == SHN_UNDEF) && (s->st_value != 0)) { - ERROR("%5d In '%s', shndx=%d && value=0x%08x. We do not " - "handle this yet\n", pid, si->name, s->st_shndx, - s->st_value); - return -1; - } - sym_addr = (unsigned)(s->st_value + base); - sym_name = (char *)(strtab + symtab[sym].st_name); - COUNT_RELOC(RELOC_SYMBOL); - } else { - s = 0; - } - -/* TODO: This is ugly. Split up the relocations by arch into - * different files. - */ - switch(type){ -#if defined(ANDROID_ARM_LINKER) - case R_ARM_JUMP_SLOT: - COUNT_RELOC(RELOC_ABSOLUTE); - MARK(rel->r_offset); - TRACE_TYPE(RELO, "%5d RELO JMP_SLOT %08x <- %08x %s\n", pid, - reloc, sym_addr, sym_name); - *((unsigned*)reloc) = sym_addr; - break; - case R_ARM_GLOB_DAT: - COUNT_RELOC(RELOC_ABSOLUTE); - MARK(rel->r_offset); - TRACE_TYPE(RELO, "%5d RELO GLOB_DAT %08x <- %08x %s\n", pid, - reloc, sym_addr, sym_name); - *((unsigned*)reloc) = sym_addr; - break; - case R_ARM_ABS32: - COUNT_RELOC(RELOC_ABSOLUTE); - MARK(rel->r_offset); - TRACE_TYPE(RELO, "%5d RELO ABS %08x <- %08x %s\n", pid, - reloc, sym_addr, sym_name); - *((unsigned*)reloc) += sym_addr; - break; -#elif defined(ANDROID_X86_LINKER) - case R_386_JUMP_SLOT: - COUNT_RELOC(RELOC_ABSOLUTE); - MARK(rel->r_offset); - TRACE_TYPE(RELO, "%5d RELO JMP_SLOT %08x <- %08x %s\n", pid, - reloc, sym_addr, sym_name); - *((unsigned*)reloc) = sym_addr; - break; - case R_386_GLOB_DAT: - COUNT_RELOC(RELOC_ABSOLUTE); - MARK(rel->r_offset); - TRACE_TYPE(RELO, "%5d RELO GLOB_DAT %08x <- %08x %s\n", pid, - reloc, sym_addr, sym_name); - *((unsigned*)reloc) = sym_addr; - break; -#endif /* ANDROID_*_LINKER */ - -#if defined(ANDROID_ARM_LINKER) - case R_ARM_RELATIVE: -#elif defined(ANDROID_X86_LINKER) - case R_386_RELATIVE: -#endif /* ANDROID_*_LINKER */ - COUNT_RELOC(RELOC_RELATIVE); - MARK(rel->r_offset); - if(sym){ - ERROR("%5d odd RELATIVE form...\n", pid); - return -1; - } - TRACE_TYPE(RELO, "%5d RELO RELATIVE %08x <- +%08x\n", pid, - reloc, si->base); - *((unsigned*)reloc) += si->base; - break; - -#if defined(ANDROID_X86_LINKER) - case R_386_32: - COUNT_RELOC(RELOC_RELATIVE); - MARK(rel->r_offset); - - TRACE_TYPE(RELO, "%5d RELO R_386_32 %08x <- +%08x %s\n", pid, - reloc, sym_addr, sym_name); - *((unsigned *)reloc) += (unsigned)sym_addr; - break; - - case R_386_PC32: - COUNT_RELOC(RELOC_RELATIVE); - MARK(rel->r_offset); - TRACE_TYPE(RELO, "%5d RELO R_386_PC32 %08x <- " - "+%08x (%08x - %08x) %s\n", pid, reloc, - (sym_addr - reloc), sym_addr, reloc, sym_name); - *((unsigned *)reloc) += (unsigned)(sym_addr - reloc); - break; -#endif /* ANDROID_X86_LINKER */ - -#ifdef ANDROID_ARM_LINKER - case R_ARM_COPY: - COUNT_RELOC(RELOC_COPY); - MARK(rel->r_offset); - TRACE_TYPE(RELO, "%5d RELO %08x <- %d @ %08x %s\n", pid, - reloc, s->st_size, sym_addr, sym_name); - memcpy((void*)reloc, (void*)sym_addr, s->st_size); - break; -#endif /* ANDROID_ARM_LINKER */ - - default: - ERROR("%5d unknown reloc type %d @ %p (%d)\n", - pid, type, rel, (int) (rel - start)); - return -1; - } - rel++; - } - return 0; -} - -static void call_array(unsigned *ctor, int count) -{ - int n; - for(n = count; n > 0; n--){ - TRACE("[ %5d Looking at ctor *0x%08x == 0x%08x ]\n", pid, - (unsigned)ctor, (unsigned)*ctor); - void (*func)() = (void (*)()) *ctor++; - if(((int) func == 0) || ((int) func == -1)) continue; - TRACE("[ %5d Calling func @ 0x%08x ]\n", pid, (unsigned)func); - func(); - } -} - -static void call_constructors(soinfo *si) -{ - /* TODO: THE ORIGINAL CODE SEEMED TO CALL THE INIT FUNCS IN THE WRONG ORDER. - * Old order: init, init_array, preinit_array.. - * Correct order: preinit_array, init, init_array. - * Verify WHY. - */ - - if (si->flags & FLAG_EXE) { - TRACE("[ %5d Calling preinit_array @ 0x%08x [%d] for '%s' ]\n", - pid, (unsigned)si->preinit_array, si->preinit_array_count, - si->name); - call_array(si->preinit_array, si->preinit_array_count); - TRACE("[ %5d Done calling preinit_array for '%s' ]\n", pid, si->name); - } else { - if (si->preinit_array) { - ERROR("%5d Shared library '%s' has a preinit_array table @ 0x%08x." - " This is INVALID.\n", pid, si->name, - (unsigned)si->preinit_array); - } - } - - // If we have an init section, then we should call it now, to make sure - // that all the funcs in the .ctors section get run. - // Note: For ARM, we shouldn't have a .ctor section (should be empty) - // when we have an (pre)init_array section, but let's be compatible with - // old (non-eabi) binaries and try the _init (DT_INIT) anyway. - if (si->init_func) { - TRACE("[ %5d Calling init_func @ 0x%08x for '%s' ]\n", pid, - (unsigned)si->init_func, si->name); - si->init_func(); - TRACE("[ %5d Done calling init_func for '%s' ]\n", pid, si->name); - } - - if (si->init_array) { - TRACE("[ %5d Calling init_array @ 0x%08x [%d] for '%s' ]\n", pid, - (unsigned)si->init_array, si->init_array_count, si->name); - call_array(si->init_array, si->init_array_count); - TRACE("[ %5d Done calling init_array for '%s' ]\n", pid, si->name); - } -} - -static void call_destructors(soinfo *si) -{ - if (si->fini_array) { - TRACE("[ %5d Calling fini_array @ 0x%08x [%d] for '%s' ]\n", pid, - (unsigned)si->fini_array, si->fini_array_count, si->name); - call_array(si->fini_array, si->fini_array_count); - TRACE("[ %5d Done calling fini_array for '%s' ]\n", pid, si->name); - } - - // If we have an fini section, then we should call it now, to make sure - // that all the funcs in the .dtors section get run. - // Note: For ARM, we shouldn't have a .dtor section (should be empty) - // when we have an fini_array section, but let's be compatible with - // old (non-eabi) binaries and try the _fini (DT_FINI) anyway. - if (si->fini_func) { - TRACE("[ %5d Calling fini_func @ 0x%08x for '%s' ]\n", pid, - (unsigned)si->fini_func, si->name); - si->fini_func(); - TRACE("[ %5d Done calling fini_func for '%s' ]\n", pid, si->name); - } -} - -/* Force any of the closed stdin, stdout and stderr to be associated with - /dev/null. */ -static int nullify_closed_stdio (void) -{ - int dev_null, i, status; - int return_value = 0; - - dev_null = open("/dev/null", O_RDWR); - if (dev_null < 0) { - ERROR("Cannot open /dev/null.\n"); - return -1; - } - TRACE("[ %5d Opened /dev/null file-descriptor=%d]\n", pid, dev_null); - - /* If any of the stdio file descriptors is valid and not associated - with /dev/null, dup /dev/null to it. */ - for (i = 0; i < 3; i++) { - /* If it is /dev/null already, we are done. */ - if (i == dev_null) - continue; - - TRACE("[ %5d Nullifying stdio file descriptor %d]\n", pid, i); - /* The man page of fcntl does not say that fcntl(..,F_GETFL) - can be interrupted but we do this just to be safe. */ - do { - status = fcntl(i, F_GETFL); - } while (status < 0 && errno == EINTR); - - /* If file is openned, we are good. */ - if (status >= 0) - continue; - - /* The only error we allow is that the file descriptor does not - exist, in which case we dup /dev/null to it. */ - if (errno != EBADF) { - ERROR("nullify_stdio: unhandled error %s\n", strerror(errno)); - return_value = -1; - continue; - } - - /* Try dupping /dev/null to this stdio file descriptor and - repeat if there is a signal. Note that any errors in closing - the stdio descriptor are lost. */ - do { - status = dup2(dev_null, i); - } while (status < 0 && errno == EINTR); - - if (status < 0) { - ERROR("nullify_stdio: dup2 error %s\n", strerror(errno)); - return_value = -1; - continue; - } - } - - /* If /dev/null is not one of the stdio file descriptors, close it. */ - if (dev_null > 2) { - TRACE("[ %5d Closing /dev/null file-descriptor=%d]\n", pid, dev_null); - do { - status = close(dev_null); - } while (status < 0 && errno == EINTR); - - if (status < 0) { - ERROR("nullify_stdio: close error %s\n", strerror(errno)); - return_value = -1; - } - } - - return return_value; -} - -static int link_image(soinfo *si, unsigned wr_offset) -{ - unsigned *d; - Elf32_Phdr *phdr = si->phdr; - int phnum = si->phnum; - - INFO("[ %5d linking %s ]\n", pid, si->name); - DEBUG("%5d si->base = 0x%08x si->flags = 0x%08x\n", pid, - si->base, si->flags); - - if (si->flags & FLAG_EXE) { - /* Locate the needed program segments (DYNAMIC/ARM_EXIDX) for - * linkage info if this is the executable. If this was a - * dynamic lib, that would have been done at load time. - * - * TODO: It's unfortunate that small pieces of this are - * repeated from the load_library routine. Refactor this just - * slightly to reuse these bits. - */ - si->size = 0; - for(; phnum > 0; --phnum, ++phdr) { -#ifdef ANDROID_ARM_LINKER - if(phdr->p_type == PT_ARM_EXIDX) { - /* exidx entries (used for stack unwinding) are 8 bytes each. - */ - si->ARM_exidx = (unsigned *)phdr->p_vaddr; - si->ARM_exidx_count = phdr->p_memsz / 8; - } -#endif - if (phdr->p_type == PT_LOAD) { - /* For the executable, we use the si->size field only in - dl_unwind_find_exidx(), so the meaning of si->size - is not the size of the executable; it is the last - virtual address of the loadable part of the executable; - since si->base == 0 for an executable, we use the - range [0, si->size) to determine whether a PC value - falls within the executable section. Of course, if - a value is below phdr->p_vaddr, it's not in the - executable section, but a) we shouldn't be asking for - such a value anyway, and b) if we have to provide - an EXIDX for such a value, then the executable's - EXIDX is probably the better choice. - */ - DEBUG_DUMP_PHDR(phdr, "PT_LOAD", pid); - if (phdr->p_vaddr + phdr->p_memsz > si->size) - si->size = phdr->p_vaddr + phdr->p_memsz; - /* try to remember what range of addresses should be write - * protected */ - if (!(phdr->p_flags & PF_W)) { - unsigned _end; - - if (phdr->p_vaddr < si->wrprotect_start) - si->wrprotect_start = phdr->p_vaddr; - _end = (((phdr->p_vaddr + phdr->p_memsz + PAGE_SIZE - 1) & - (~PAGE_MASK))); - if (_end > si->wrprotect_end) - si->wrprotect_end = _end; - } - } else if (phdr->p_type == PT_DYNAMIC) { - if (si->dynamic != (unsigned *)-1) { - ERROR("%5d multiple PT_DYNAMIC segments found in '%s'. " - "Segment at 0x%08x, previously one found at 0x%08x\n", - pid, si->name, si->base + phdr->p_vaddr, - (unsigned)si->dynamic); - goto fail; - } - DEBUG_DUMP_PHDR(phdr, "PT_DYNAMIC", pid); - si->dynamic = (unsigned *) (si->base + phdr->p_vaddr); - } - } - } - - if (si->dynamic == (unsigned *)-1) { - ERROR("%5d missing PT_DYNAMIC?!\n", pid); - goto fail; - } - - DEBUG("%5d dynamic = %p\n", pid, si->dynamic); - - /* extract useful information from dynamic section */ - for(d = si->dynamic; *d; d++){ - DEBUG("%5d d = %p, d[0] = 0x%08x d[1] = 0x%08x\n", pid, d, d[0], d[1]); - switch(*d++){ - case DT_HASH: - si->nbucket = ((unsigned *) (si->base + *d))[0]; - si->nchain = ((unsigned *) (si->base + *d))[1]; - si->bucket = (unsigned *) (si->base + *d + 8); - si->chain = (unsigned *) (si->base + *d + 8 + si->nbucket * 4); - break; - case DT_STRTAB: - si->strtab = (const char *) (si->base + *d); - break; - case DT_SYMTAB: - si->symtab = (Elf32_Sym *) (si->base + *d); - break; - case DT_PLTREL: - if(*d != DT_REL) { - ERROR("DT_RELA not supported\n"); - goto fail; - } - break; - case DT_JMPREL: - si->plt_rel = (Elf32_Rel*) (si->base + *d); - break; - case DT_PLTRELSZ: - si->plt_rel_count = *d / 8; - break; - case DT_REL: - si->rel = (Elf32_Rel*) (si->base + *d); - break; - case DT_RELSZ: - si->rel_count = *d / 8; - break; - case DT_PLTGOT: - /* Save this in case we decide to do lazy binding. We don't yet. */ - si->plt_got = (unsigned *)(si->base + *d); - break; - case DT_DEBUG: - // Set the DT_DEBUG entry to the addres of _r_debug for GDB - *d = (int) &_r_debug; - break; - case DT_RELA: - ERROR("%5d DT_RELA not supported\n", pid); - goto fail; - case DT_INIT: - si->init_func = (void (*)(void))(si->base + *d); - DEBUG("%5d %s constructors (init func) found at %p\n", - pid, si->name, si->init_func); - break; - case DT_FINI: - si->fini_func = (void (*)(void))(si->base + *d); - DEBUG("%5d %s destructors (fini func) found at %p\n", - pid, si->name, si->fini_func); - break; - case DT_INIT_ARRAY: - si->init_array = (unsigned *)(si->base + *d); - DEBUG("%5d %s constructors (init_array) found at %p\n", - pid, si->name, si->init_array); - break; - case DT_INIT_ARRAYSZ: - si->init_array_count = ((unsigned)*d) / sizeof(Elf32_Addr); - break; - case DT_FINI_ARRAY: - si->fini_array = (unsigned *)(si->base + *d); - DEBUG("%5d %s destructors (fini_array) found at %p\n", - pid, si->name, si->fini_array); - break; - case DT_FINI_ARRAYSZ: - si->fini_array_count = ((unsigned)*d) / sizeof(Elf32_Addr); - break; - case DT_PREINIT_ARRAY: - si->preinit_array = (unsigned *)(si->base + *d); - DEBUG("%5d %s constructors (preinit_array) found at %p\n", - pid, si->name, si->preinit_array); - break; - case DT_PREINIT_ARRAYSZ: - si->preinit_array_count = ((unsigned)*d) / sizeof(Elf32_Addr); - break; - case DT_TEXTREL: - /* TODO: make use of this. */ - /* this means that we might have to write into where the text - * segment was loaded during relocation... Do something with - * it. - */ - DEBUG("%5d Text segment should be writable during relocation.\n", - pid); - break; - } - } - - DEBUG("%5d si->base = 0x%08x, si->strtab = %p, si->symtab = %p\n", - pid, si->base, si->strtab, si->symtab); - - if((si->strtab == 0) || (si->symtab == 0)) { - ERROR("%5d missing essential tables\n", pid); - goto fail; - } - - for(d = si->dynamic; *d; d += 2) { - if(d[0] == DT_NEEDED){ - DEBUG("%5d %s needs %s\n", pid, si->name, si->strtab + d[1]); - soinfo *lsi = find_library(si->strtab + d[1]); - if(lsi == 0) { - ERROR("%5d could not load '%s'\n", pid, si->strtab + d[1]); - goto fail; - } - lsi->refcount++; - } - } - - if(si->plt_rel) { - DEBUG("[ %5d relocating %s plt ]\n", pid, si->name ); - if(reloc_library(si, si->plt_rel, si->plt_rel_count)) - goto fail; - } - if(si->rel) { - DEBUG("[ %5d relocating %s ]\n", pid, si->name ); - if(reloc_library(si, si->rel, si->rel_count)) - goto fail; - } - - si->flags |= FLAG_LINKED; - DEBUG("[ %5d finished linking %s ]\n", pid, si->name); - -#if 0 - /* This is the way that the old dynamic linker did protection of - * non-writable areas. It would scan section headers and find where - * .text ended (rather where .data/.bss began) and assume that this is - * the upper range of the non-writable area. This is too coarse, - * and is kept here for reference until we fully move away from single - * segment elf objects. See the code in get_wr_offset (also #if'd 0) - * that made this possible. - */ - if(wr_offset < 0xffffffff){ - mprotect((void*) si->base, wr_offset, PROT_READ | PROT_EXEC); - } -#else - /* TODO: Verify that this does the right thing in all cases, as it - * presently probably does not. It is possible that an ELF image will - * come with multiple read-only segments. What we ought to do is scan - * the program headers again and mprotect all the read-only segments. - * To prevent re-scanning the program header, we would have to build a - * list of loadable segments in si, and then scan that instead. */ - if (si->wrprotect_start != 0xffffffff && si->wrprotect_end != 0) { - mprotect((void *)si->wrprotect_start, - si->wrprotect_end - si->wrprotect_start, - PROT_READ | PROT_EXEC); - } -#endif - - /* If this is a SET?ID program, dup /dev/null to opened stdin, - stdout and stderr to close a security hole described in: - - ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-02:23.stdio.asc - - */ - if (getuid() != geteuid() || getgid() != getegid()) - nullify_closed_stdio (); - call_constructors(si); - notify_gdb_of_load(si); - return 0; - -fail: - ERROR("failed to link %s\n", si->name); - si->flags |= FLAG_ERROR; - return -1; -} - -int main(int argc, char **argv) -{ - return 0; -} - -#define ANDROID_TLS_SLOTS BIONIC_TLS_SLOTS - -static void * __tls_area[ANDROID_TLS_SLOTS]; - -unsigned __linker_init(unsigned **elfdata) -{ - static soinfo linker_soinfo; - - int argc = (int) *elfdata; - char **argv = (char**) (elfdata + 1); - unsigned *vecs = (unsigned*) (argv + argc + 1); - soinfo *si; - struct link_map * map; - - pid = getpid(); - -#if TIMING - struct timeval t0, t1; - gettimeofday(&t0, 0); -#endif - - __set_tls(__tls_area); - ((unsigned *)__get_tls())[TLS_SLOT_THREAD_ID] = gettid(); - - debugger_init(); - - /* skip past the environment */ - while(vecs[0] != 0) { - if(!strncmp((char*) vecs[0], "DEBUG=", 6)) { - debug_verbosity = atoi(((char*) vecs[0]) + 6); - } - vecs++; - } - vecs++; - - INFO("[ android linker & debugger ]\n"); - DEBUG("%5d elfdata @ 0x%08x\n", pid, (unsigned)elfdata); - - si = alloc_info(argv[0]); - if(si == 0) { - exit(-1); - } - - /* bootstrap the link map, the main exe always needs to be first */ - si->flags |= FLAG_EXE; - map = &(si->linkmap); - - map->l_addr = 0; - map->l_name = argv[0]; - map->l_prev = NULL; - map->l_next = NULL; - - _r_debug.r_map = map; - r_debug_tail = map; - - /* gdb expects the linker to be in the debug shared object list, - * and we need to make sure that the reported load address is zero. - * Without this, gdb gets the wrong idea of where rtld_db_dlactivity() - * is. Don't use alloc_info(), because the linker shouldn't - * be on the soinfo list. - */ - strcpy((char*) linker_soinfo.name, "/system/bin/linker"); - linker_soinfo.flags = 0; - linker_soinfo.base = 0; // This is the important part; must be zero. - insert_soinfo_into_debug_map(&linker_soinfo); - - /* extract information passed from the kernel */ - while(vecs[0] != 0){ - switch(vecs[0]){ - case AT_PHDR: - si->phdr = (Elf32_Phdr*) vecs[1]; - break; - case AT_PHNUM: - si->phnum = (int) vecs[1]; - break; - case AT_ENTRY: - si->entry = vecs[1]; - break; - } - vecs += 2; - } - - si->base = 0; - si->dynamic = (unsigned *)-1; - si->wrprotect_start = 0xffffffff; - si->wrprotect_end = 0; - - if(link_image(si, 0)){ - ERROR("CANNOT LINK EXECUTABLE '%s'\n", argv[0]); - exit(-1); - } - -#if TIMING - gettimeofday(&t1,NULL); - PRINT("LINKER TIME: %s: %d microseconds\n", argv[0], (int) ( - (((long long)t1.tv_sec * 1000000LL) + (long long)t1.tv_usec) - - (((long long)t0.tv_sec * 1000000LL) + (long long)t0.tv_usec) - )); -#endif -#if STATS - PRINT("RELO STATS: %s: %d abs, %d rel, %d copy, %d symbol\n", argv[0], - linker_stats.reloc[RELOC_ABSOLUTE], - linker_stats.reloc[RELOC_RELATIVE], - linker_stats.reloc[RELOC_COPY], - linker_stats.reloc[RELOC_SYMBOL]); -#endif -#if COUNT_PAGES - { - unsigned n; - unsigned i; - unsigned count = 0; - for(n = 0; n < 4096; n++){ - if(bitmask[n]){ - unsigned x = bitmask[n]; - for(i = 0; i < 8; i++){ - if(x & 1) count++; - x >>= 1; - } - } - } - PRINT("PAGES MODIFIED: %s: %d (%dKB)\n", argv[0], count, count * 4); - } -#endif - -#if TIMING || STATS || COUNT_PAGES - fflush(stdout); -#endif - - TRACE("[ %5d Ready to execute '%s' @ 0x%08x ]\n", pid, si->name, - si->entry); - return si->entry; -} diff --git a/linker/linker.h b/linker/linker.h deleted file mode 100644 index 3ad5104..0000000 --- a/linker/linker.h +++ /dev/null @@ -1,213 +0,0 @@ -/* - * Copyright (C) 2008 The Android Open Source Project - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * * Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * * 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 COPYRIGHT HOLDERS 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 - * COPYRIGHT OWNER 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. - */ - -#ifndef _LINKER_H_ -#define _LINKER_H_ - -#include <unistd.h> -#include <sys/types.h> -#include <linux/elf.h> - -#undef PAGE_MASK -#undef PAGE_SIZE -#define PAGE_SIZE 4096 -#define PAGE_MASK 4095 - -void debugger_init(); -const char *addr_to_name(unsigned addr); - -/* magic shared structures that GDB knows about */ - -struct link_map -{ - uintptr_t l_addr; - char * l_name; - uintptr_t l_ld; - struct link_map * l_next; - struct link_map * l_prev; -}; - -/* needed for dl_iterate_phdr to be passed to the callbacks provided */ -struct dl_phdr_info -{ - Elf32_Addr dlpi_addr; - const char *dlpi_name; - const Elf32_Phdr *dlpi_phdr; - Elf32_Half dlpi_phnum; -}; - - -// Values for r_debug->state -enum { - RT_CONSISTENT, - RT_ADD, - RT_DELETE -}; - -struct r_debug -{ - int32_t r_version; - struct link_map * r_map; - void (*r_brk)(void); - int32_t r_state; - uintptr_t r_ldbase; -}; - -typedef struct soinfo soinfo; - -#define FLAG_LINKED 0x00000001 -#define FLAG_ERROR 0x00000002 -#define FLAG_EXE 0x00000004 // The main executable -#define FLAG_PRELINKED 0x00000008 // This is a pre-linked lib - -#define SOINFO_NAME_LEN 128 - -struct soinfo -{ - const char name[SOINFO_NAME_LEN]; - Elf32_Phdr *phdr; - int phnum; - unsigned entry; - unsigned base; - unsigned size; - - unsigned *dynamic; - - unsigned wrprotect_start; - unsigned wrprotect_end; - - soinfo *next; - unsigned flags; - - const char *strtab; - Elf32_Sym *symtab; - - unsigned nbucket; - unsigned nchain; - unsigned *bucket; - unsigned *chain; - - unsigned *plt_got; - - Elf32_Rel *plt_rel; - unsigned plt_rel_count; - - Elf32_Rel *rel; - unsigned rel_count; - - unsigned *preinit_array; - unsigned preinit_array_count; - - unsigned *init_array; - unsigned init_array_count; - unsigned *fini_array; - unsigned fini_array_count; - - void (*init_func)(void); - void (*fini_func)(void); - -#ifdef ANDROID_ARM_LINKER - /* ARM EABI section used for stack unwinding. */ - unsigned *ARM_exidx; - unsigned ARM_exidx_count; -#endif - - unsigned refcount; - struct link_map linkmap; -}; - - -extern soinfo libdl_info; - -/* these must all be powers of two */ -#define LIBBASE 0x80000000 -#define LIBLAST 0x90000000 -#define LIBINC 0x00100000 - - -#ifdef ANDROID_ARM_LINKER - -#define R_ARM_COPY 20 -#define R_ARM_GLOB_DAT 21 -#define R_ARM_JUMP_SLOT 22 -#define R_ARM_RELATIVE 23 - -#elif defined(ANDROID_X86_LINKER) - -#define R_386_32 1 -#define R_386_PC32 2 -#define R_386_GLOB_DAT 6 -#define R_386_JUMP_SLOT 7 -#define R_386_RELATIVE 8 - -#endif /* ANDROID_*_LINKER */ - - -#ifndef DT_INIT_ARRAY -#define DT_INIT_ARRAY 25 -#endif - -#ifndef DT_FINI_ARRAY -#define DT_FINI_ARRAY 26 -#endif - -#ifndef DT_INIT_ARRAYSZ -#define DT_INIT_ARRAYSZ 27 -#endif - -#ifndef DT_FINI_ARRAYSZ -#define DT_FINI_ARRAYSZ 28 -#endif - -#ifndef DT_PREINIT_ARRAY -#define DT_PREINIT_ARRAY 32 -#endif - -#ifndef DT_PREINIT_ARRAYSZ -#define DT_PREINIT_ARRAYSZ 33 -#endif - -/* in theory we only need the above relative relocations, - but in practice the following one turns up from time - to time. fushigi na. -*/ -#define R_ARM_ABS32 2 - -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, unsigned *base); - -#ifdef ANDROID_ARM_LINKER -typedef long unsigned int *_Unwind_Ptr; -_Unwind_Ptr dl_unwind_find_exidx(_Unwind_Ptr pc, int *pcount); -#elif defined(ANDROID_X86_LINKER) -int dl_iterate_phdr(int (*cb)(struct dl_phdr_info *, size_t, void *), void *); -#endif - -#endif diff --git a/linker/linker_debug.h b/linker/linker_debug.h deleted file mode 100644 index 6e396fd..0000000 --- a/linker/linker_debug.h +++ /dev/null @@ -1,141 +0,0 @@ -/* - * Copyright (C) 2008 The Android Open Source Project - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * * Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * * 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 COPYRIGHT HOLDERS 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 - * COPYRIGHT OWNER 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. - */ - -#ifndef _LINKER_DEBUG_H_ -#define _LINKER_DEBUG_H_ - -#include <stdio.h> - -/* WARNING: For linker debugging only.. Be careful not to leave any of - * this on when submitting back to repository */ -#define LINKER_DEBUG 0 -#define TRACE_DEBUG 0 -#define DO_TRACE_LOOKUP 1 -#define DO_TRACE_RELO 1 -#define TIMING 0 -#define STATS 0 -#define COUNT_PAGES 0 - -/********************************************************************* - * You shouldn't need to modify anything below unless you are adding - * more debugging information. - * - * To enable/disable specific debug options, change the defines above - *********************************************************************/ - - -/*********************************************************************/ -#undef TRUE -#undef FALSE -#define TRUE 1 -#define FALSE 0 - - -#define __PRINTVF(v,f,x...) do { \ - (debug_verbosity > (v)) && (printf(x), ((f) && fflush(stdout))); \ - } while (0) -/* Only use printf() during debugging. We have seen occasional memory - * corruption when the linker uses printf(). - */ -#if LINKER_DEBUG -extern int debug_verbosity; -#warning "*** LINKER IS USING printf(); DO NOT CHECK THIS IN ***" -#define _PRINTVF(v,f,x...) __PRINTVF(v,f,x) -#else /* !LINKER_DEBUG */ -#define _PRINTVF(v,f,x...) do {} while(0) -#endif /* LINKER_DEBUG */ - -#define PRINT(x...) _PRINTVF(-1, FALSE, x) -#define INFO(x...) _PRINTVF(0, TRUE, x) -#define TRACE(x...) _PRINTVF(1, TRUE, x) -#define WARN(fmt,args...) \ - _PRINTVF(-1, TRUE, "%s:%d| WARNING: " fmt, __FILE__, __LINE__, ## args) -#define ERROR(fmt,args...) \ - __PRINTVF(-1, TRUE, "%s:%d| ERROR: " fmt, __FILE__, __LINE__, ## args) - -#if TRACE_DEBUG -#define DEBUG(x...) _PRINTVF(2, TRUE, "DEBUG: " x) -#else /* !TRACE_DEBUG */ -#define DEBUG(x...) do {} while (0) -#endif /* TRACE_DEBUG */ - -#if LINKER_DEBUG -#define TRACE_TYPE(t,x...) do { if (DO_TRACE_##t) { TRACE(x); } } while (0) -#else /* !LINKER_DEBUG */ -#define TRACE_TYPE(t,x...) do {} while (0) -#endif /* LINKER_DEBUG */ - -#if STATS -#define RELOC_ABSOLUTE 0 -#define RELOC_RELATIVE 1 -#define RELOC_COPY 2 -#define RELOC_SYMBOL 3 -#define NUM_RELOC_STATS 4 - -struct _link_stats { - int reloc[NUM_RELOC_STATS]; -}; -extern struct _link_stats linker_stats; - -#define COUNT_RELOC(type) \ - do { if (type >= 0 && type < NUM_RELOC_STATS) { \ - linker_stats.reloc[type] += 1; \ - } else { \ - PRINT("Unknown reloc stat requested\n"); \ - } \ - } while(0) -#else /* !STATS */ -#define COUNT_RELOC(type) do {} while(0) -#endif /* STATS */ - -#if TIMING -#undef WARN -#define WARN(x...) do {} while (0) -#endif /* TIMING */ - -#if COUNT_PAGES -extern unsigned bitmask[]; -#define MARK(offset) do { \ - bitmask[((offset) >> 12) >> 3] |= (1 << (((offset) >> 12) & 7)); \ - } while(0) -#else -#define MARK(x) do {} while (0) -#endif - -#define DEBUG_DUMP_PHDR(phdr, name, pid) do { \ - DEBUG("%5d %s (phdr = 0x%08x)\n", (pid), (name), (unsigned)(phdr)); \ - DEBUG("\t\tphdr->offset = 0x%08x\n", (unsigned)((phdr)->p_offset)); \ - DEBUG("\t\tphdr->p_vaddr = 0x%08x\n", (unsigned)((phdr)->p_vaddr)); \ - DEBUG("\t\tphdr->p_paddr = 0x%08x\n", (unsigned)((phdr)->p_paddr)); \ - DEBUG("\t\tphdr->p_filesz = 0x%08x\n", (unsigned)((phdr)->p_filesz)); \ - DEBUG("\t\tphdr->p_memsz = 0x%08x\n", (unsigned)((phdr)->p_memsz)); \ - DEBUG("\t\tphdr->p_flags = 0x%08x\n", (unsigned)((phdr)->p_flags)); \ - DEBUG("\t\tphdr->p_align = 0x%08x\n", (unsigned)((phdr)->p_align)); \ - } while (0) - -#endif /* _LINKER_DEBUG_H_ */ diff --git a/linker/rt.c b/linker/rt.c deleted file mode 100644 index 30d5a48..0000000 --- a/linker/rt.c +++ /dev/null @@ -1,36 +0,0 @@ -/* - * Copyright (C) 2008 The Android Open Source Project - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * * Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * * 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 COPYRIGHT HOLDERS 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 - * COPYRIGHT OWNER 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. - */ - -/* - * This function is an empty stub where GDB locates a breakpoint to get notified - * about linker activity. - */ -void __attribute__((noinline)) rtld_db_dlactivity(void) -{ -} - |