/* Startup code for ARM & ELF Copyright (C) 1995, 1996, 1997, 1998 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library 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. 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 Library General Public License for more details. You should have received a copy of the GNU Library General Public License along with the GNU C Library; see the file COPYING.LIB. 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. Note that the code in the .init section has already been run. This includes _init and _libc_init At this entry point, most registers' values are unspecified, except: a1 Contains a function pointer to be registered with `atexit'. This is how the dynamic linker arranges to have DT_FINI functions called for shared libraries that have been loaded before this code runs. 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 */ .text .globl _start _start: /* Clear the frame pointer since this is the outermost frame. */ mov fp, #0 /* Pop argc off the stack and save a pointer to argv */ ldmfd sp!, {a2} mov a3, sp /* Push the last arguments to main() onto the stack */ stmfd sp!, {a1} ldr a1, =_fini stmfd sp!, {a1} /* Set up the other arguments for main() that go in registers */ ldr a1, =main ldr a4, =_init /* __libc_start_main (main, argc, argv, init, fini, rtld_fini) */ /* Let the libc call main and exit with its return code. */ bl __libc_start_main /* should never get here....*/ bl 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