! crt1.s for sparc & sparcv9 (SunOS 5) ! Copyright (C) 1992 Free Software Foundation, Inc. ! Written By David Vinayak Henkel-Wallace, June 1992 ! ! This file is free software; you can redistribute it and/or modify it ! under the terms of the GNU General Public License as published by the ! Free Software Foundation; either version 2, or (at your option) any ! later version. ! ! In addition to the permissions in the GNU General Public License, the ! Free Software Foundation gives you unlimited permission to link the ! compiled version of this file with other programs, and to distribute ! those programs without any restriction coming from the use of this ! file. (The General Public License restrictions do apply in other ! respects; for example, they cover modification of the file, and ! distribution when not linked into another program.) ! ! This file 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 ! General Public License for more details. ! ! You should have received a copy of the GNU General Public License ! along with this program; see the file COPYING. If not, write to ! the Free Software Foundation, 59 Temple Place - Suite 330, ! Boston, MA 02111-1307, USA. ! ! As a special exception, if you link this library with files ! compiled with GCC to produce an executable, this does not cause ! the resulting executable to be covered by the GNU General Public License. ! This exception does not however invalidate any other reasons why ! the executable file might be covered by the GNU General Public License. ! ! This file takes control of the process from the kernel, as specified ! in section 3 of the SVr4 ABI. ! This file is the first thing linked into any executable. #ifdef __sparcv9 #define CPTRSIZE 8 #define CPTRSHIFT 3 #define STACK_BIAS 2047 #define ldn ldx #define stn stx #define setn(s, scratch, dst) setx s, scratch, dst #else #define CPTRSIZE 4 #define CPTRSHIFT 2 #define STACK_BIAS 0 #define ldn ld #define stn st #define setn(s, scratch, dst) set s, dst #endif .section ".text" .proc 022 .global _start _start: mov 0, %fp ! Mark bottom frame pointer ldn [%sp + (16 * CPTRSIZE) + STACK_BIAS], %l0 ! argc add %sp, (17 * CPTRSIZE) + STACK_BIAS, %l1 ! argv ! Leave some room for a call. Sun leaves 32 octets (to sit on ! a cache line?) so we do too. #ifdef __sparcv9 sub %sp, 48, %sp #else sub %sp, 32, %sp #endif ! %g1 may contain a function to be registered w/atexit orcc %g0, %g1, %g0 #ifdef __sparcv9 be %xcc, .nope #else be .nope #endif mov %g1, %o0 call atexit nop .nope: ! Now make sure constructors and destructors are handled. setn(_fini, %o1, %o0) call atexit, 1 nop call _init, 0 nop ! We ignore the auxiliary vector; there is no defined way to ! access those data anyway. Instead, go straight to main: mov %l0, %o0 ! argc mov %l1, %o1 ! argv ! Skip argc words past argv, to env: sll %l0, CPTRSHIFT, %o2 add %o2, CPTRSIZE, %o2 add %l1, %o2, %o2 ! env setn(_environ, %o4, %o3) stn %o2, [%o3] ! *_environ call main, 4 nop call exit, 0 nop call _exit, 0 nop ! We should never get here. .type _start,#function .size _start,.-_start