| David 'Digit' Turner | 03eabfe | 2009-05-28 15:54:03 +0200 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2009 The Android Open Source Project |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * * Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * * Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in |
| 12 | * the documentation and/or other materials provided with the |
| 13 | * distribution. |
| 14 | * |
| 15 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 16 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 17 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| 18 | * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| 19 | * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 20 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
| 21 | * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS |
| 22 | * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
| 23 | * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| 24 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| 25 | * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 26 | * SUCH DAMAGE. |
| 27 | */ |
| 28 | |
| 29 | #ifndef _BIONIC_PREINIT_H |
| 30 | #define _BIONIC_PREINIT_H |
| 31 | |
| 32 | #include "pthread_internal.h" |
| 33 | #include "bionic_tls.h" |
| 34 | #include <asm/page.h> |
| 35 | |
| 36 | /* this function is used to perform a minimal initialization of the |
| 37 | * the C library. This must be performed before any other call to |
| 38 | * other functions, in either the dynamic linker's startup code |
| 39 | * or libc_init_static.c |
| 40 | * |
| 41 | * 'main_thread' and 'tls_area' must be persistent variables, |
| 42 | * which means they must be either global, or allocated in the |
| 43 | * main thread's stack frame and never, ever, freed before |
| 44 | * program exit. |
| 45 | * |
| 46 | * VERY IMPORTANT NOTE: |
| 47 | * |
| 48 | * THIS IMPLEMENTATION SHOULD NOT USE GLOBAL VARIABLES. |
| 49 | * |
| 50 | * The reason is the dynamic linker's tricky usage of C library |
| 51 | * functions and later renaming of their symbols. See the |
| 52 | * "C Library Usage Restriction" section in bionic/linker/README.TXT |
| 53 | * for details. |
| 54 | */ |
| 55 | |
| 56 | extern unsigned __get_sp(void); |
| 57 | extern pid_t gettid(void); |
| 58 | |
| 59 | static __inline__ void |
| 60 | __libc_preinit( pthread_internal_t* main_thread, |
| 61 | void* tls_area[BIONIC_TLS_SLOTS] ) |
| 62 | { |
| 63 | pthread_attr_t thread_attr; |
| 64 | |
| 65 | /* Setup the main thread's information */ |
| 66 | unsigned stacktop = (__get_sp() & ~(PAGE_SIZE - 1)) + PAGE_SIZE; |
| 67 | unsigned stacksize = 128 * 1024; |
| 68 | unsigned stackbottom = stacktop - stacksize; |
| 69 | |
| 70 | pthread_attr_init(&thread_attr); |
| 71 | pthread_attr_setstack(&thread_attr, (void*)stackbottom, stacksize); |
| 72 | _init_thread(main_thread, gettid(), &thread_attr, (void*)stackbottom); |
| 73 | __init_tls(tls_area, main_thread); |
| 74 | } |
| 75 | |
| 76 | #endif /* _BIONIC_INIT_H */ |