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/*
* 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
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