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/* Startup code for Alpha/ELF.
   Copyright (C) 1993,1995,1996,1997,1998,2000,2001 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Richard Henderson <rth@tamu.edu>

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#define a0      $16     /* argument registers (caller-saved) */
#define a1      $17
#define a2      $18
#define a3      $19
#define a4      $20
#define a5      $21
#define ra      $26     /* return address register */

#define s6      $15
#define fp      s6      /* frame-pointer (s6 in frame-less procedures) */
#define gp      $29     /* global pointer */
#define sp      $30     /* stack pointer */
#define zero    $31     /* reads as zero, writes are noops */

        .text
        .align 3
        .globl _start
        .ent _start, 0
        .type _start,@function
#if defined L_crt0 || ! defined __UCLIBC_CTOR_DTOR__
        .type   __uClibc_main,@function
#else
        .weak   _init
        .weak   _fini
        .type   __uClibc_start_main,@function
#endif
/* Stick in a dummy reference to main(), so that if an application
 * is linking when the main() function is in a static library (.a)
 * we can be sure that main() actually gets linked in */
        .type   main,@function

_start:
        .frame fp, 0, zero
        mov     zero, fp
        br      gp, 1f
1:      ldgp    gp, 0(gp)
        subq    sp, 16, sp
        .prologue 0

        ldl     a0, 16(sp)      /* get argc */
        lda     a1, 24(sp)      /* get argv */
        addq    a0, 1, a2
        s8addq  a2, a1, a2      /* Calculate environ */

  /* Call the user's main function, and exit with its value.
     But let the libc call main.  */
        jsr     ra, __uClibc_main

  /* Die very horribly if exit returns.  Call_pal hlt is callable from
     kernel mode only; this will result in an illegal instruction trap.  */
        call_pal 0
        .end _start

/* For ECOFF backwards compatibility. */
.weak    __start;
        __start    =   _start

/* Define a symbol for the first piece of initialized data.  */
        .data
        .globl __data_start
__data_start:
        .long 0
        .weak data_start
        data_start = __data_start