148 lines
4.7 KiB
C++
148 lines
4.7 KiB
C++
/*
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* Copyright (C) 2008 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <unistd.h>
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#include <elf.h>
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#include <asm/page.h>
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#include "pthread_internal.h"
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#include "atexit.h"
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#include "KernelArgumentBlock.h"
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#include "libc_init_common.h"
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#include <bionic_tls.h>
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#include <errno.h>
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#include <private/bionic_auxv.h>
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extern "C" unsigned __get_sp(void);
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extern "C" int __system_properties_init(void);
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// Not public, but well-known in the BSDs.
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const char* __progname;
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// Declared in <unistd.h>.
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char** environ;
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// Declared in <asm/page.h>.
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unsigned int __page_size = PAGE_SIZE;
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unsigned int __page_shift = PAGE_SHIFT;
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/* Init TLS for the initial thread. Called by the linker _before_ libc is mapped
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* in memory. Beware: all writes to libc globals from this function will
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* apply to linker-private copies and will not be visible from libc later on.
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*
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* Note: this function creates a pthread_internal_t for the initial thread and
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* stores the pointer in TLS, but does not add it to pthread's gThreadList. This
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* has to be done later from libc itself (see __libc_init_common).
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*
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* This function also stores a pointer to the kernel argument block in a TLS slot to be
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* picked up by the libc constructor.
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*/
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void __libc_init_tls(KernelArgumentBlock& args) {
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__libc_auxv = args.auxv;
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unsigned stack_top = (__get_sp() & ~(PAGE_SIZE - 1)) + PAGE_SIZE;
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unsigned stack_size = 128 * 1024;
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unsigned stack_bottom = stack_top - stack_size;
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pthread_attr_t thread_attr;
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pthread_attr_init(&thread_attr);
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pthread_attr_setstack(&thread_attr, (void*) stack_bottom, stack_size);
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static pthread_internal_t thread;
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_init_thread(&thread, gettid(), &thread_attr, (void*) stack_bottom, false);
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static void* tls_area[BIONIC_TLS_SLOTS];
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__init_tls(tls_area, &thread);
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tls_area[TLS_SLOT_BIONIC_PREINIT] = &args;
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}
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void __libc_init_common(KernelArgumentBlock& args) {
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// Initialize various globals.
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environ = args.envp;
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errno = 0;
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__libc_auxv = args.auxv;
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__progname = args.argv[0] ? args.argv[0] : "<unknown>";
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// Get the main thread from TLS and add it to the thread list.
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pthread_internal_t* main_thread = __get_thread();
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main_thread->allocated_on_heap = false;
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_pthread_internal_add(main_thread);
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__system_properties_init(); // Requires 'environ'.
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}
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/* This function will be called during normal program termination
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* to run the destructors that are listed in the .fini_array section
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* of the executable, if any.
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*
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* 'fini_array' points to a list of function addresses. The first
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* entry in the list has value -1, the last one has value 0.
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*/
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void __libc_fini(void* array) {
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void** fini_array = reinterpret_cast<void**>(array);
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const size_t minus1 = ~(size_t)0; /* ensure proper sign extension */
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/* Sanity check - first entry must be -1 */
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if (array == NULL || (size_t)fini_array[0] != minus1) {
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return;
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}
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/* skip over it */
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fini_array += 1;
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/* Count the number of destructors. */
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int count = 0;
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while (fini_array[count] != NULL) {
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++count;
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}
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/* Now call each destructor in reverse order. */
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while (count > 0) {
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void (*func)() = (void (*)()) fini_array[--count];
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/* Sanity check, any -1 in the list is ignored */
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if ((size_t)func == minus1) {
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continue;
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}
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func();
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}
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#ifndef LIBC_STATIC
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{
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extern void __libc_postfini(void) __attribute__((weak));
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if (__libc_postfini) {
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__libc_postfini();
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}
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}
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#endif
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}
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