1! crt1.s for sparc & sparcv9 (SunOS 5) 2 3! Copyright (C) 1992-2021 Free Software Foundation, Inc. 4! Written By David Vinayak Henkel-Wallace, June 1992 5! 6! This file is free software; you can redistribute it and/or modify it 7! under the terms of the GNU General Public License as published by the 8! Free Software Foundation; either version 3, or (at your option) any 9! later version. 10! 11! This file is distributed in the hope that it will be useful, but 12! WITHOUT ANY WARRANTY; without even the implied warranty of 13! MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14! General Public License for more details. 15! 16! Under Section 7 of GPL version 3, you are granted additional 17! permissions described in the GCC Runtime Library Exception, version 18! 3.1, as published by the Free Software Foundation. 19! 20! You should have received a copy of the GNU General Public License and 21! a copy of the GCC Runtime Library Exception along with this program; 22! see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23! <http://www.gnu.org/licenses/>. 24 25! This file takes control of the process from the kernel, as specified 26! in section 3 of the SVr4 ABI. 27! This file is the first thing linked into any executable. 28 29#ifdef __sparcv9 30#define CPTRSIZE 8 31#define CPTRSHIFT 3 32#define STACK_BIAS 2047 33#define ldn ldx 34#define stn stx 35#define setn(s, scratch, dst) setx s, scratch, dst 36#else 37#define CPTRSIZE 4 38#define CPTRSHIFT 2 39#define STACK_BIAS 0 40#define ldn ld 41#define stn st 42#define setn(s, scratch, dst) set s, dst 43#endif 44 45 .section ".text" 46 .proc 022 47 .global _start 48 49_start: 50 mov 0, %fp ! Mark bottom frame pointer 51 ldn [%sp + (16 * CPTRSIZE) + STACK_BIAS], %l0 ! argc 52 add %sp, (17 * CPTRSIZE) + STACK_BIAS, %l1 ! argv 53 54 ! Leave some room for a call. Sun leaves 32 octets (to sit on 55 ! a cache line?) so we do too. 56#ifdef __sparcv9 57 sub %sp, 48, %sp 58#else 59 sub %sp, 32, %sp 60#endif 61 62 ! %g1 may contain a function to be registered w/atexit 63 orcc %g0, %g1, %g0 64#ifdef __sparcv9 65 be %xcc, .nope 66#else 67 be .nope 68#endif 69 mov %g1, %o0 70 call atexit 71 nop 72.nope: 73 ! Now make sure constructors and destructors are handled. 74 setn(_fini, %o1, %o0) 75 call atexit, 1 76 nop 77 call _init, 0 78 nop 79 80 ! We ignore the auxiliary vector; there is no defined way to 81 ! access those data anyway. Instead, go straight to main: 82 mov %l0, %o0 ! argc 83 mov %l1, %o1 ! argv 84#ifdef GCRT1 85 setn(___Argv, %o4, %o3) 86 stn %o1, [%o3] ! *___Argv 87#endif 88 ! Skip argc words past argv, to env: 89 sll %l0, CPTRSHIFT, %o2 90 add %o2, CPTRSIZE, %o2 91 add %l1, %o2, %o2 ! env 92 setn(_environ, %o4, %o3) 93 stn %o2, [%o3] ! *_environ 94 call main, 4 95 nop 96 call exit, 0 97 nop 98 call _exit, 0 99 nop 100 ! We should never get here. 101 102 .type _start,#function 103 .size _start,.-_start 104