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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
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