lapetus-cvs

[Theo B. <cyb...@us...>]

Update of /cvsroot/lapetus/lapetus/tests/shared
In directory sc8-pr-cvs6.sourceforge.net:/tmp/cvs-serv3007

Added Files:
	BART.LNK crt0.s makefile 
Log Message:
-Bunch of dependencies

--- NEW FILE: crt0.s ---
!
! Bart's Custom Sega Saturn Start-Up Code
! Bart Trzynadlowski, 2001
! Public domain
!
! For use with the GNU C Compiler. This code has been tested with gcc version
! cygnus-2.7-96q3.
!
! Make sure this is the first file linked into your project, so that it is at
! the very beginning. Use the BART.LNK linker script. Load the resulting
! binary at 0x6004000 on the Sega Saturn and begin execution there.
!

.section .text

!
! Entry point
!
.global start
start:
    !
    ! Clear BSS
    !
    mov.l   bss_start,r0
    mov.l   bss_end,r1
    mov     #0,r2
lbss:
    cmp/ge  r0,r1
    bt      lbss_end
    add     #1,r0
    mov.b   r2,@r0
    bra     lbss
lbss_end:

    !
    ! Set initial stack pointer. Stack is from 0x6002000-0x6003FFF
    !
    mov.l   stack_ptr,r15

    !
    ! Jump to main()
    !
    mov.l   main_ptr,r0
    jsr @r0
    nop

    !
    ! When main() terminates, jump back to the ARP entry point
    !
    mov.l   arp_ptr,r0
    jmp @r0
    nop
    nop

    !
    ! Following is never reached, it was the from the original
    ! version of crt0.s
    !

    !
    ! Once _main() has terminated, disable interrupts and loop infinitely
    !
    mov     #0xf,r0
    shll2   r0
    shll2   r0
    ldc     r0,sr
end:
    bra     end
    nop

arp_ptr:    .long 0x02000100
main_ptr:   .long _main
stack_ptr:  .long 0x6004000 ! stack is from 0x6002000-0x6003FFF
bss_start:  .long __bss_start
bss_end:    .long __bss_end

! This is to keep libc happy

.global _atexit
   bra end
   nop

--- NEW FILE: makefile ---
CC	=	sh-coff-gcc
AS	=	sh-coff-as
LD	=	sh-coff-ld

ifndef TARGETTYPE
TARGETTYPE =    binary
endif

LDFLAGS =       -nostartfiles --script ../shared/bart.lnk --oformat $(TARGETTYPE)

CRT0    =       obj/crt0.o

LIBS    =       C:/PROGRA~1/KPITCU~1/GNUSHV~1/sh-coff/sh-coff/lib/libc.a \
                C:/PROGRA~1/KPITCU~1/GNUSHV~1/sh-coff/lib/gcc/sh-coff/4.0-GNUSH_v0601/libgcc.a

obj/crt0.o:    ../shared/crt0.s
	$(AS) $< -o $@


--- NEW FILE: BART.LNK ---
/*
 * Bart's Custom Sega Saturn Linker Script
 * Bart Trzynadlowski, 2001
 * Public domain
 *
 * For use with the GNU linker, ld. This script has been tested with ld
 * version 2.6-96q3.
 *
 * This script allows code to be loaded at 0x6004000. Data follows immediately
 * after the code, and BSS (uninitialized data) immediately after that. The
 * output file is a plain binary image. Begin execution at the very beginning
 * of the binary (0x6004000.)
 */

OUTPUT_FORMAT("binary")
SECTIONS
{
    . = 0x6004000;
    .text : { *(.text) }
    .tors : {                
       ___ctors = . ;           
       *(.ctors)                
       ___ctors_end = . ;               
       ___dtors = . ;           
       *(.dtors)                
       ___dtors_end = . ;               
    }                
    .data : { *(.data) }
    __bss_start = .;
    .bss : { *(.bss) }
    __bss_end = .;
    _end = .;
}