3e1d5563b6
The toolchain is new enough that should be able to use the actual instructions now... Test: treehugger Change-Id: I30aafcdc5386268344c40dc6cc9a22caf591915a
94 lines
3.5 KiB
C
94 lines
3.5 KiB
C
/*
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* Copyright (C) 2012 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 "../../bionic/libc_init_common.h"
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#include <stddef.h>
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#include <stdint.h>
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#define SECTION(name) __attribute__((__section__(name)))
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SECTION(".preinit_array") init_func_t* __PREINIT_ARRAY__ = (init_func_t*)-1;
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SECTION(".init_array.0") init_func_t* __INIT_ARRAY__ = (init_func_t*)-1;
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SECTION(".fini_array.0") fini_func_t* __FINI_ARRAY__ = (fini_func_t*)-1;
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#undef SECTION
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__used static void _start_main(void* raw_args) {
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structors_array_t array;
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array.preinit_array = &__PREINIT_ARRAY__;
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array.init_array = &__INIT_ARRAY__;
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array.fini_array = &__FINI_ARRAY__;
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__libc_init(raw_args, NULL, &main, &array);
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}
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#define PRE ".text; .global _start; .type _start,%function; _start:"
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#define POST "; .size _start, .-_start"
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#if defined(__aarch64__)
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__asm__(PRE "bti j; mov x0,sp; b _start_main" POST);
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#elif defined(__arm__)
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__asm__(PRE "mov r0,sp; b _start_main" POST);
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#elif defined(__i386__)
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__asm__(PRE "movl %esp,%eax; andl $~0xf,%esp; subl $12,%esp; pushl %eax; calll _start_main" POST);
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#elif defined(__x86_64__)
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__asm__(PRE "movq %rsp,%rdi; andq $~0xf,%rsp; callq _start_main" POST);
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#else
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#error unsupported architecture
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#endif
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#undef PRE
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#undef POST
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// On arm32 and arm64, when targeting Q and up, overalign the TLS segment to
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// (8 * sizeof(void*)), which reserves enough space between the thread pointer
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// and the executable's TLS segment for Bionic's TLS slots. It has the side
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// effect of placing a 0-sized TLS segment into Android executables that don't
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// use TLS, but this should be harmless.
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//
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// To ensure that the .tdata input section isn't deleted (e.g. by
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// --gc-sections), the .text input section (which contains _start) has a
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// relocation to the .tdata input section.
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#if __ANDROID_API__ >= 29
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#if defined(__arm__)
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asm(" .section .tdata,\"awT\",%progbits\n"
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" .p2align 5\n"
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" .text\n"
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" .reloc 0, R_ARM_NONE, .tdata\n");
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#elif defined(__aarch64__)
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asm(" .section .tdata,\"awT\",@progbits\n"
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" .p2align 6\n"
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" .text\n"
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" .reloc 0, R_AARCH64_NONE, .tdata\n");
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#endif
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#endif
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#include "__dso_handle.h"
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#include "atexit.h"
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#include "pthread_atfork.h"
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#ifdef __i386__
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# include "../../arch-x86/bionic/__stack_chk_fail_local.h"
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#endif
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