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The Android Open Source Project
2008-10-21 07:00:00 -07:00
commit a27d2baa0c
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68
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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=$(LINKER_AREA_SIZE)
ifeq ($(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 :=

0
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190
linker/NOTICE Normal file
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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
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represent, as a whole, an original work of authorship. For the purposes
of this License, Derivative Works shall not include works that remain
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"Contribution" shall mean any work of authorship, including
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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
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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,
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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
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within a display generated by the Derivative Works, if and
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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
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that such additional attribution notices cannot be construed
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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
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of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
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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
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work stoppage, computer failure or malfunction, or any and all
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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
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on Your own behalf and on Your sole responsibility, not on behalf
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incurred by, or claims asserted against, such Contributor by reason
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END OF TERMS AND CONDITIONS

17
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.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

23
linker/arch/x86/begin.S Normal file
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.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

52
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#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);
}

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/*
* 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,
};

1702
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#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

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#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
/* 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...) do { \
(debug_verbosity > (v)) && (printf(x), ((f) && fflush(stdout))); \
} while (0)
#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_ */

8
linker/rt.c Normal file
View File

@@ -0,0 +1,8 @@
/*
* This function is an empty stub where GDB locates a breakpoint to get notified
* about linker activity.
*/
void __attribute__((noinline)) rtld_db_dlactivity(void)
{
}