| /* |
| * C startup code for the Fujitsu SPARClite demo board |
| * |
| * Copyright (c) 1995, 1996 Cygnus Support |
| * |
| * The authors hereby grant permission to use, copy, modify, distribute, |
| * and license this software and its documentation for any purpose, provided |
| * that existing copyright notices are retained in all copies and that this |
| * notice is included verbatim in any distributions. No written agreement, |
| * license, or royalty fee is required for any of the authorized uses. |
| * Modifications to this software may be copyrighted by their authors |
| * and need not follow the licensing terms described here, provided that |
| * the new terms are clearly indicated on the first page of each file where |
| * they apply. |
| */ |
| #include "asm.h" |
| |
| #ifdef TARGET_CPU_SPARC64 |
| #define STACK_BIAS 2047 |
| #define SAVE_SIZE -128 |
| #else |
| #define SAVE_SIZE -64 |
| #endif |
| |
| .data |
| .align 8 |
| SYM(environ): ! this is the first address in the data section |
| .long 0 |
| |
| SYM(argc): |
| .long 0 |
| |
| .text |
| .align 8 |
| |
| .globl SYM(start) |
| .globl start |
| SYM(start): |
| start: |
| /* see if the stack is already setup. if not, then default |
| * to using the value of %sp as set by the ROM monitor |
| */ |
| sethi %hi(__stack), %g1 |
| or %g1,%lo(__stack),%g1 |
| cmp %g0,%g1 |
| be 1f |
| nop |
| #ifdef STACK_BIAS |
| sub %g1, STACK_BIAS, %g1 |
| #endif |
| mov %g1, %sp ! set the stack pointer |
| mov 0, %fp |
| 1: |
| |
| /* zero the bss section */ |
| sethi %hi(__bss_start),%g2 |
| or %g2,%lo(__bss_start),%g2 ! start of bss |
| sethi %hi(_end),%g3 |
| or %g3,%lo(_end),%g3 ! end of bss |
| mov %g0,%g1 ! so std has two zeros |
| zerobss: |
| std %g0,[%g2] |
| add %g2,8,%g2 |
| cmp %g2,%g3 |
| bleu,a zerobss |
| nop |
| |
| /* |
| * initialize target specific stuff. Only execute these |
| * functions it they exist. |
| */ |
| init: |
| sethi %hi(SYM(hardware_init_hook)), %g1 |
| or %g1,%lo(SYM(hardware_init_hook)),%g1 |
| cmp %g0,%g1 |
| be 1f |
| nop |
| call SYM(hardware_init_hook) |
| nop |
| |
| 1: |
| sethi %hi(SYM(software_init_hook)), %g1 |
| or %g1,%lo(SYM(software_init_hook)),%g1 |
| cmp %g0,%g1 |
| be 2f |
| nop |
| call SYM(software_init_hook) |
| nop |
| 2: |
| set SYM(__sigtramp), %o0 |
| call SYM(__install_signal_handler) |
| nop |
| |
| set do_dtors,%o0 |
| call SYM(atexit) |
| nop |
| |
| call do_ctors |
| nop |
| |
| set SYM(argc), %o0 |
| call SYM(__getProgramArgs) |
| nop |
| |
| mov %o0, %o1 |
| set SYM(argc), %o0 |
| ld [%o0], %o0 |
| call SYM(main) |
| nop |
| |
| /* call exit from the C library so atexit gets called, and the |
| * C++ destructors get run. This calls our exit routine below |
| * when it's done. |
| */ |
| call SYM(exit) |
| nop |
| |
| do_ctors: |
| save %sp,SAVE_SIZE,%sp |
| set __CTOR_LIST__,%l0 |
| our_entry: |
| ld [%l0],%l1 |
| add %l0,4,%l0 |
| tst %l1 |
| 1: |
| beq 2f |
| nop |
| ld [%l0],%l2 |
| add %l0,4,%l0 |
| |
| call %l2 |
| nop |
| deccc %l1 |
| b 1b |
| nop |
| 2: |
| ret |
| restore |
| |
| do_dtors: |
| save %sp,SAVE_SIZE,%sp |
| set __DTOR_LIST__,%l0 |
| b our_entry |
| nop |