srcs: ["arch-common/bionic/crtbegin.c"],
arch: {
- arm64: {
- srcs: [
- "arch-arm64/bionic/crtbegin.c",
- ],
- exclude_srcs: [
- "arch-common/bionic/crtbegin.c",
- ],
- },
mips: {
srcs: [
"arch-mips/bionic/crtbegin.c",
srcs: ["arch-common/bionic/crtbegin.c"],
arch: {
- arm64: {
- srcs: [
- "arch-arm64/bionic/crtbegin.c",
- ],
- exclude_srcs: [
- "arch-common/bionic/crtbegin.c",
- ],
- },
mips: {
srcs: [
"arch-mips/bionic/crtbegin.c",
+++ /dev/null
-/*
- * Copyright (C) 2013 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 "../../bionic/libc_init_common.h"
-#include <stddef.h>
-#include <stdint.h>
-
-__attribute__ ((section (".preinit_array")))
-void (*__PREINIT_ARRAY__)(void) = (void (*)(void)) -1;
-
-__attribute__ ((section (".init_array")))
-void (*__INIT_ARRAY__)(void) = (void (*)(void)) -1;
-
-__attribute__ ((section (".fini_array")))
-void (*__FINI_ARRAY__)(void) = (void (*)(void)) -1;
-
-
-__LIBC_HIDDEN__ void do_arm64_start(void* raw_args) {
- structors_array_t array;
- array.preinit_array = &__PREINIT_ARRAY__;
- array.init_array = &__INIT_ARRAY__;
- array.fini_array = &__FINI_ARRAY__;
- __libc_init(raw_args, NULL, &main, &array);
-}
-
-/*
- * Put the value of sp in x0 and call do_arm64_init(). The latter will then
- * then be able to access the stack as prepared by the kernel's execve system
- * call (via the first argument).
- */
-__asm__ (
-" .text \n"
-" .align 2 \n"
-" .global _start \n"
-" .hidden _start \n"
-" .type _start, %function \n"
-"_start: \n"
-" add x0, sp, xzr \n"
-" b do_arm64_start \n"
-" .size _start, .-_start \n"
-);
-
-#include "../../arch-common/bionic/__dso_handle.h"
-#include "../../arch-common/bionic/atexit.h"
-#include "../../arch-common/bionic/pthread_atfork.h"
#include <stddef.h>
#include <stdint.h>
-__attribute__ ((section (".preinit_array")))
+__attribute__((__section__(".preinit_array")))
void (*__PREINIT_ARRAY__)(void) = (void (*)(void)) -1;
-__attribute__ ((section (".init_array")))
+__attribute__((__section__(".init_array")))
void (*__INIT_ARRAY__)(void) = (void (*)(void)) -1;
-__attribute__ ((section (".fini_array")))
+__attribute__((__section__(".fini_array")))
void (*__FINI_ARRAY__)(void) = (void (*)(void)) -1;
-__LIBC_HIDDEN__
-#ifdef __i386__
-__attribute__((force_align_arg_pointer))
-#endif
-void _start() {
+static void _start_main(void* raw_args) {
structors_array_t array;
array.preinit_array = &__PREINIT_ARRAY__;
array.init_array = &__INIT_ARRAY__;
array.fini_array = &__FINI_ARRAY__;
- void* raw_args = (void*) ((uintptr_t) __builtin_frame_address(0) + sizeof(void*));
-#ifdef __x86_64__
- // 16-byte stack alignment is required by x86_64 ABI
- asm("andq $~15, %rsp");
-#endif
__libc_init(raw_args, NULL, &main, &array);
}
+#define PRE ".text; .global _start; .type _start,%function; _start:"
+#define POST "; .size _start, .-_start"
+
+#if defined(__aarch64__)
+__asm__(PRE "mov x0,sp; b _start_main" POST);
+#elif defined(__arm__)
+__asm__(PRE "mov r0,sp; b _start_main" POST);
+#elif defined(__i386__)
+__asm__(PRE "movl %esp,%eax; andl $~0xf,%esp; pushl %eax; calll _start_main" POST);
+#elif defined(__x86_64__)
+__asm__(PRE "movq %rsp,%rdi; andq $~0xf,%rsp; callq _start_main" POST);
+#else
+#error unsupported architecture
+#endif
+
+#undef PRE
+#undef POST
+
#include "__dso_handle.h"
#include "atexit.h"
#include "pthread_atfork.h"