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filename test/crt0.s
changeset 185:6755a04c447f
author nkeynes
date Sun Aug 06 06:13:51 2006 +0000 (17 years ago)
permissions -rw-r--r--
last change First pass at implementing the tile clip. Reasonably accurate wrt basic
understanding of how its supposed to work, not so accurate wrt actual
hardware behaviour
file annotate diff log raw 
     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000

     1.2 +++ b/test/crt0.s	Sun Aug 06 06:13:51 2006 +0000

     1.3 @@ -0,0 +1,119 @@

     1.4 +	.section .text

     1.5 +	.global	start

     1.6 +	.global ___exit

     1.7 +	.global _atexit

     1.8 +start:

     1.9 +	mov.l	setup_cache_k,r0

    1.10 +	mov.l	p2_mask,r1

    1.11 +	or	r1,r0

    1.12 +	jmp	@r0

    1.13 +	nop

    1.14 +setup_cache:

    1.15 +	mov.l	ccr_addr,r0

    1.16 +	mov.w	ccr_data,r1

    1.17 +	mov.l	r1,@r0

    1.18 +	mov.l	start_2_k,r0	

    1.19 +	nop

    1.20 +	nop

    1.21 +	nop

    1.22 +	nop

    1.23 +	nop

    1.24 +	nop

    1.25 +	nop

    1.26 +	jmp	@r0	

    1.27 +	nop

    1.28 +start_2:		

    1.29 +	mov.l	old_stack_k,r14

    1.30 +	mov.l	r15,@r14

    1.31 +	mov.l	old_pr_k,r14

    1.32 +	sts	pr,r15

    1.33 +	mov.l	r15,@r14

    1.34 +	mov.l	stack_k,r15

    1.35 +

    1.36 +	! zero out bss

    1.37 +	mov.l	edata_k,r0

    1.38 +	mov.l	end_k,r1

    1.39 +	mov	#0,r2

    1.40 +start_l:

    1.41 +	mov.l	r2,@r0

    1.42 +	add	#4,r0

    1.43 +	cmp/ge	r0,r1

    1.44 +	bt	start_l

    1.45 +

    1.46 +#if defined (__SH3E__) || defined(__SH4_SINGLE__) || defined(__SH4__) || defined(__SH4_SINGLE_ONLY)

    1.47 +	mov.l set_fpscr_k, r1

    1.48 +	jsr @r1

    1.49 +	mov #0,r4

    1.50 +	lds r3,fpscr

    1.51 +#endif /*  defined (__SH3E__) || defined(__SH4_SINGLE__) || defined(__SH4__) || defined(__SH4_SINGLE_ONLY__) */

    1.52 +

    1.53 +	! call the mainline	

    1.54 +	mov.l	main_k,r0

    1.55 +	jsr	@r0

    1.56 +	or	r0,r0

    1.57 +

    1.58 +	! call exit

    1.59 +	mov	r0,r4

    1.60 +	mov.l	exit_k,r0

    1.61 +	jsr	@r0

    1.62 +	or	r0,r0

    1.63 +

    1.64 +___exit:

    1.65 +	mov.l	old_pr_k,r14

    1.66 +	mov.l	@r14,r15	

    1.67 +	lds	r15,pr

    1.68 +	mov.l	old_stack_k,r14

    1.69 +	mov.l	@r14,r15	

    1.70 +	rts

    1.71 +	nop

    1.72 +

    1.73 +_atexit:

    1.74 +	rts

    1.75 +	nop

    1.76 +		

    1.77 +	.align 4

    1.78 +#if defined (__SH3E__) || defined(__SH4_SINGLE__) || defined(__SH4__) || defined(__SH4_SINGLE_ONLY__)

    1.79 +set_fpscr_k:

    1.80 +	.long	___set_fpscr

    1.81 +#endif /*  defined (__SH3E__) || defined(__SH4_SINGLE__) || defined(__SH4__) || defined(SH4_SINGLE_ONLY) */

    1.82 +stack_k:

    1.83 +	.long	_stack	

    1.84 +edata_k:

    1.85 +	.long	_edata

    1.86 +end_k:

    1.87 +	.long	_end

    1.88 +main_k:

    1.89 +	.long	_main

    1.90 +exit_k:

    1.91 +	.long	_exit

    1.92 +

    1.93 +old_stack_k:

    1.94 +	.long	_old_stack

    1.95 +old_pr_k:

    1.96 +	.long	_old_pr

    1.97 +

    1.98 +_old_stack:

    1.99 +	.long	0

   1.100 +_old_pr:

   1.101 +	.long	0

   1.102 +

   1.103 +setup_cache_k:

   1.104 +	.long	setup_cache

   1.105 +start_2_k:	

   1.106 +	.long	start_2	

   1.107 +p2_mask:

   1.108 +	.long	0xa0000000

   1.109 +ccr_addr:

   1.110 +	.long	0xff00001c

   1.111 +ccr_data:

   1.112 +	.word	0x090b

   1.113 +

   1.114 +	.align 4

   1.115 +		

   1.116 +#ifdef __ELF__

   1.117 +	.section .stack,"aw"

   1.118 +#else

   1.119 +	.section .stack

   1.120 +#endif

   1.121 +! _stack:	.long	0xdeaddead

   1.122 +
.