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/*
* libc/sysdeps/linux/v850/crt0.S -- Initial program entry point for linux/v850
*
* Copyright (C) 2001,2002 NEC Corporation
* Copyright (C) 2001,2002 Miles Bader <miles@gnu.org>
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License. See the file COPYING.LIB in the main
* directory of this archive for more details.
*
* Written by Miles Bader <miles@gnu.org>
*/
#include <clinkage.h>
/* Upon entry, the stack contains the following data:
argc, argv[0], ..., argv[argc-1], 0, envp[0], ..., 0
*/
.text
C_ENTRY(start):
ld.w 0[sp], r6 // Arg 0: argc
addi 4, sp, r7 // Arg 1: argv
mov r7, r8 // Arg 2: envp
mov r6, r10 // skip argc elements to get envp start
add 1, r10 // ...plus the NULL at the end of argv
shl 2, r10 // Convert to byte-count to skip
add r10, r8
// Zero bss area, since we can't rely upon any loader to do so
mov hilo(C_SYMBOL_NAME(edata)), ep
mov hilo(C_SYMBOL_NAME(end)), r10
2: cmp ep, r10
be 3f
sst.w r0, 0[ep]
add 4, ep
br 2b
// Load CTBP register
3: mov hilo(C_SYMBOL_NAME(_ctbp)), r19
ldsr r19, ctbp
// Load GP
mov hilo(C_SYMBOL_NAME(_gp)), gp
// call uclibc's startup routine
jarl C_SYMBOL_NAME(__uClibc_main), lp
// should never get here....
jr C_SYMBOL_NAME(abort)
/* 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. */
L_dummy_main_reference:
.long C_SYMBOL_NAME(main)
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