/* 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: r4 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 */ #include <features.h> .text .globl _start .type _start,%function .type main,%function _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+,r5 mov r15, r6 /* Push the stack_end, rtld_fini and fini func onto the stack */ mov.l r6,@-r15 mov.l r4,@-r15 #ifdef __PIC__ mova L_got, r0 mov.l L_got, r12 add r0, r12 mov.l L_fini,r0 add r12, r0 mov.l r0,@-r15 /* Set up the main/init funcs that go in registers */ mov.l L_main, r4 add r12, r4 mov.l L_init, r7 add r12, r7 /* __uClibc_main (main, argc, argv, init, fini, rtld_fini, stack_end) */ /* Let the libc call main and exit with its return code. */ mov.l L_uClibc_main,r0 mov.l @(r0,r12),r1 jsr @r1 nop /* We should not get here. */ mov.l L_abort,r0 mov.l @(r0,r12),r1 jsr @r1 nop #else mov.l L_fini,r0 mov.l r0,@-r15 /* Set up the main/init funcs that go in registers */ mov.l L_main,r4 mov.l L_init,r7 /* __uClibc_main (main, argc, argv, init, fini, rtld_fini, stack_end) */ /* Let the libc call main and exit with its return code. */ mov.l L_uClibc_main,r1 jsr @r1 nop /* We should not get here. */ mov.l L_abort,r1 jmp @r1 nop #endif .size _start,.-_start .align 2 #ifdef __PIC__ L_got: .long _GLOBAL_OFFSET_TABLE_ L_main: .long main@GOTOFF L_init: .long _init@GOTOFF L_fini: .long _fini@GOTOFF L_uClibc_main: .long __uClibc_main@GOT L_abort: .long abort@GOT #else L_main: .long main L_init: .long _init L_fini: .long _fini L_uClibc_main: .long __uClibc_main L_abort: .long abort #endif /* 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