/*-
 * Copyright 2009 Konstantin Belousov.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 <machine/asm.h>
        .text
        .align  4
        .globl  _start
        .type   _start, @function
_start:
        .cfi_startproc
        .cfi_undefined %eip
        popl    %esi            # Pop argc
        .cfi_def_cfa_offset -4
        movl    %esp,%edi       # argv starts at stack top
        xorl    %ebp,%ebp
        pushl   %ebp
        .cfi_def_cfa_offset 0
        movl    %esp,%ebp
        .cfi_offset %ebp,-4
        .cfi_def_cfa_register %ebp
        andl    $0xfffffff0,%esp # align stack

#ifdef GCRT
        subl    $4,%esp         # Align stack for 7 arguments
        pushl   $etext
        pushl   $eprol
eprol:
#else
        subl    $12,%esp        # Align stack for 5 arguments
#endif /* GCRT */

#ifdef PIC
        calll   1f
1:      popl    %ebx
        addl    $_GLOBAL_OFFSET_TABLE_+[.-1b],%ebx
        leal    main@GOTOFF(%ebx),%eax
        pushl   %eax
#else
        pushl   $main
#endif /* PIC */

        pushl   %edx            # rtld cleanup
        /* env = argv + argc + 1 */
        movl    %edi,%eax       # env = argv
        movl    %esi,%ecx
        shll    $2,%ecx         # argc * 4
        addl    %ecx,%eax       # env += argc
        addl    $4,%eax         # env += 1
        pushl   %eax            # env
        pushl   %edi            # argv
        pushl   %esi            # argc

#ifdef GCRT
        /*
         * __libc_start1_gcrt(argc, argv, env, cleanup, main, &eprol, &etext);
         */
        calll   __libc_start1_gcrt
#else
        /*
         * __libc_start1(argc, argv, env, cleanup, main);
         */
#ifdef PIC
        calll   __libc_start1@PLT
#else
        calll   __libc_start1
#endif
#endif /* GCRT */
        int3
        .cfi_endproc
        .size   _start, . - _start

        .section .note.GNU-stack,"",%progbits