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/*
* 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 <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <elf.h>
#include <asm/page.h>
#include "pthread_internal.h"
#include "atexit.h"
#include "libc_init_common.h"
#include <bionic_tls.h>
#include <errno.h>
extern unsigned __get_sp(void);
extern pid_t gettid(void);
char* __progname;
char **environ;
/* from asm/page.h */
unsigned int __page_size = PAGE_SIZE;
unsigned int __page_shift = PAGE_SHIFT;
int __system_properties_init(void);
/* Init TLS for the initial thread. Called by the linker _before_ libc is mapped
* in memory. Beware: all writes to libc globals from this function will
* apply to linker-private copies and will not be visible from libc later on.
*
* Note: this function creates a pthread_internal_t for the initial thread and
* stores the pointer in TLS, but does not add it to pthread's gThreadList. This
* has to be done later from libc itself (see __libc_init_common).
*
* This function also stores elfdata argument in a specific TLS slot to be later
* picked up by the libc constructor.
*/
void __libc_init_tls(unsigned** elfdata)
{
pthread_attr_t thread_attr;
static pthread_internal_t thread;
static void* tls_area[BIONIC_TLS_SLOTS];
/* setup pthread runtime and main thread descriptor */
unsigned stacktop = (__get_sp() & ~(PAGE_SIZE - 1)) + PAGE_SIZE;
unsigned stacksize = 128 * 1024;
unsigned stackbottom = stacktop - stacksize;
pthread_attr_init(&thread_attr);
pthread_attr_setstack(&thread_attr, (void*)stackbottom, stacksize);
_init_thread(&thread, gettid(), &thread_attr, (void*)stackbottom);
__init_tls(tls_area, &thread);
tls_area[TLS_SLOT_BIONIC_PREINIT] = elfdata;
}
void __libc_init_common(uintptr_t *elfdata)
{
int argc = *elfdata;
char** argv = (char**)(elfdata + 1);
char** envp = argv + argc + 1;
/* get the initial thread from TLS and add it to gThreadList */
_pthread_internal_add(__get_thread());
/* clear errno */
errno = 0;
/* set program name */
__progname = argv[0] ? argv[0] : "<unknown>";
/* setup environment pointer */
environ = envp;
/* setup system properties - requires environment */
__system_properties_init();
}
/* This function will be called during normal program termination
* to run the destructors that are listed in the .fini_array section
* of the executable, if any.
*
* 'fini_array' points to a list of function addresses. The first
* entry in the list has value -1, the last one has value 0.
*/
void __libc_fini(void* array)
{
int count;
void** fini_array = array;
const size_t minus1 = ~(size_t)0; /* ensure proper sign extension */
/* Sanity check - first entry must be -1 */
if (array == NULL || (size_t)fini_array[0] != minus1) {
return;
}
/* skip over it */
fini_array += 1;
/* Count the number of destructors. */
for (count = 0; fini_array[count] != NULL; count++);
/* Now call each destructor in reverse order. */
while (count > 0) {
void (*func)() = (void (*)) fini_array[--count];
/* Sanity check, any -1 in the list is ignored */
if ((size_t)func == minus1)
continue;
func();
}
}
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