/* Startup code for SH & ELF. Copyright (C) 1999 Free Software Foundation, Inc. Copyright (C) 2001 Hewlett-Packard Australia Copyright (C) 2002 Stefan Allius This program is free software; you can redistribute it and/or modify it under the terms of the GNU Library General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program 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 Library General Public License for more details. You should have received a copy of the GNU Library General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ /* This is the canonical entry point, usually the first thing in the text segment. At this entry point, most registers' values are unspecified, except: sp The stack contains the arguments and environment: 0(sp) argc 4(sp) argv[0] ... (4*argc)(sp) NULL (4*(argc+1))(sp) envp[0] ... NULL */ #include <features.h> .file "crt0.S" .text .globl _start .type _start,@function .type main,@function .size _start,_start_end - _start _start: /* Clear the frame pointer since this is the outermost frame. */ mov #0, r14 /* Pop argc off the stack and save a pointer to argv */ mov.l @r15+,r4 mov r15, r5 #if defined L_crt0 || ! defined __UCLIBC_CTOR_DTOR__ /* * Setup the value for the environment pointer: * r6 = (argc + 1) * 4 * r6 += argv (in delay slot) */ mov r4,r6 add #1,r6 shll2 r6 /* jump to __uClibc_main (argc, argv, envp) */ mov.l L_main, r0 jsr @r0 add r5, r6 /* delay slot */ /* We should not get here. */ mov.l L_abort, r0 jmp @r0 nop _start_end: .align 2 L_main: .long __uClibc_main /* in libuClibc.*.so */ #else /* (L_crt1) && __UCLIBC_CTOR_DTOR__ */ /* Push the finip argument to __uClibc_start_main() onto the stack */ mov.l L_fini,r6 mov.l r6,@-r15 /* Setup the value for the initp argument */ mov.l L_init, r7 /* * Setup the value for the environment pointer: * r6 = (argc + 1) * 4 * r6 += argv (in delay slot) */ mov r4,r6 add #1,r6 shll2 r6 /* jump to __uClibc_start_main (argc, argv, envp, app_init, app_fini) */ mov.l L_main, r0 jsr @r0 add r5, r6 /* delay slot */ /* We should not get here. */ mov.l L_abort, r0 jmp @r0 nop _start_end: .align 2 L_main: .long __uClibc_start_main /* in libuClibc.*.so */ .weak _init .type _init,@function _init: rts nop .size _init,.-_init .weak _fini .set _fini,_init L_init: .long _init L_fini: .long _fini #endif L_abort: .long abort /* 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 #if defined __CONFIG_SH4__ .global __fpscr_values __fpscr_values: .long 0 .long 0x80000 #endif