diff options
Diffstat (limited to 'libc/arch-x86/bionic/crtbegin_dynamic.S')
| -rw-r--r-- | libc/arch-x86/bionic/crtbegin_dynamic.S | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/libc/arch-x86/bionic/crtbegin_dynamic.S b/libc/arch-x86/bionic/crtbegin_dynamic.S new file mode 100644 index 0000000..3b47b18 --- /dev/null +++ b/libc/arch-x86/bionic/crtbegin_dynamic.S @@ -0,0 +1,96 @@ +# bionic/arch-x86/bionic/crtbegin_dynamic.S +# +# Copyright 2006, The Android Open Source Project +# +# 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. +# * Neither the name of Google Inc. nor the names of its contributors may +# be used to endorse or promote products derived from this software +# without specific prior written permission. +# +# THIS SOFTWARE IS PROVIDED BY Google Inc. ``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 Google Inc. 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. + + .text + .align 4 + .type _start, @function + .globl _start + +# this is the small startup code that is first run when +# any executable that is statically-linked with Bionic +# runs. +# +# it's purpose is to call __libc_init with appropriate +# arguments, which are: +# +# - the address of the raw data block setup by the Linux +# kernel ELF loader +# +# - address of an "onexit" function, not used on any +# platform supported by Bionic +# +# - address of the "main" function of the program. We +# can't hard-code it in the adr pseudo instruction +# so we use a tiny trampoline that will get relocated +# by the dynamic linker before this code runs +# +# - address of the constructor list +# +_start: + mov %esp, %eax + mov $1f, %edx + pushl %edx + mov $0f, %edx + pushl %edx + mov $0, %edx + pushl %edx + pushl %eax + call __libc_init + +0: + jmp main + +1: .long __PREINIT_ARRAY__ + .long __INIT_ARRAY__ + .long __FINI_ARRAY__ + .long __CTOR_LIST__ + +# the .ctors section contains a list of pointers to "constructor" +# functions that need to be called in order during C library initialization, +# just before the program is being run. This is a C++ requirement +# +# the last entry shall be 0, and is defined in crtend.S +# + .section .preinit_array, "aw" + .globl __PREINIT_ARRAY__ +__PREINIT_ARRAY__: + .long -1 + + .section .init_array, "aw" + .globl __INIT_ARRAY__ +__INIT_ARRAY__: + .long -1 + + .section .fini_array, "aw" + .globl __FINI_ARRAY__ +__FINI_ARRAY__: + .long -1 + + .section .ctors, "aw" + .globl __CTOR_LIST__ +__CTOR_LIST__: + .long -1 + |