fps2bios/intro/crt0.s

.set noat
.set noreorder
.global _start

.global FlushCache
.global Exit
.global SignalSema
.global _start
.global _exit

.text
        nop
        nop
FlushCache:
        li      $3,100
        syscall
        jr      $31
        nop
Exit:
        li      $3,4
        syscall
        jr      $31
        nop
SignalSema:
        li      $3,66
        syscall
        jr      $31
        nop

        nop
        nop
_start:
        lui     $2,%hi(_args_ptr)
        addiu   $2,$2, %lo(_args_ptr)
        sw      $4,($2)
# Clear bss
zerobss:
        lui     $2,%hi(_fbss)
        lui     $3,%hi(_end)
        addiu   $2,$2,%lo(_fbss)
        addiu   $3,$3,%lo(_end)
loop:
        nop
        nop
        sq      $0,($2)
        sltu    $1,$2,$3
        bne     $1,$0,loop
        addiu   $2,$2,16

# Thread
        lui     $4,%hi(_gp)
        addiu   $4,$4,%lo(_gp)
        lui     $5,%hi(_stack)
        addiu   $5,$5,%lo(_stack)
        lui     $6,%hi(_stack_size)
        addiu   $6,$6,%lo(_stack_size)
        lui     $7,%hi(_args)
        addiu   $7,$7,%lo(_args)
        lui     $8,%hi(_root)
        addiu   $8,$8,%lo(_root)
        move    $28,$4
        addiu   $3,$0,60
        syscall
        move    $29, $2

# Heap
        addiu   $3,$0,61
        lui     $4,%hi(_end)
        addiu   $4,$4,%lo(_end)
        lui     $5,%hi(_heap_size)
        addiu   $5,$5,%lo(_heap_size)
        syscall
        nop

# Cache
        jal     FlushCache
        move    $4,$0

# Jump main
        ei

        lui     $2,%hi(_args_ptr)
        addiu   $2,$2,%lo(_args_ptr)
        lw      $3,($2)
        lui     $2,%hi(_args)
        addiu   $2,$2,%lo(_args)

        lw      $4, ($2)
        jal     main
        addiu   $5, $2, 4
_root:
_exit:
# ???
#       lui     $2,%hi(_args_ptr)
#       addiu   $2,$2,%lo(_args_ptr)
#       lw      $3,($2)
#       jal     SignalSema
#       lw      $4,($3)
# Exit
#       addiu   $3,$0,35
#       syscall
        jr  $31
        nop

        .bss
        .align  6
_args: .space   256+16*4+4

        .data
_args_ptr:
        .space 4
1	.set noat
2	.set noreorder
3	.global _start
4
5	.global FlushCache
6	.global Exit
7	.global SignalSema
8	.global _start
9	.global _exit
10
11	.text
12	nop
13	nop
14	FlushCache:
15	li $3,100
16	syscall
17	jr $31
18	nop
19	Exit:
20	li $3,4
21	syscall
22	jr $31
23	nop
24	SignalSema:
25	li $3,66
26	syscall
27	jr $31
28	nop
29
30	nop
31	nop
32	_start:
33	lui $2,%hi(_args_ptr)
34	addiu $2,$2, %lo(_args_ptr)
35	sw $4,($2)
36	# Clear bss
37	zerobss:
38	lui $2,%hi(_fbss)
39	lui $3,%hi(_end)
40	addiu $2,$2,%lo(_fbss)
41	addiu $3,$3,%lo(_end)
42	loop:
43	nop
44	nop
45	sq $0,($2)
46	sltu $1,$2,$3
47	bne $1,$0,loop
48	addiu $2,$2,16
49
50	# Thread
51	lui $4,%hi(_gp)
52	addiu $4,$4,%lo(_gp)
53	lui $5,%hi(_stack)
54	addiu $5,$5,%lo(_stack)
55	lui $6,%hi(_stack_size)
56	addiu $6,$6,%lo(_stack_size)
57	lui $7,%hi(_args)
58	addiu $7,$7,%lo(_args)
59	lui $8,%hi(_root)
60	addiu $8,$8,%lo(_root)
61	move $28,$4
62	addiu $3,$0,60
63	syscall
64	move $29, $2
65
66	# Heap
67	addiu $3,$0,61
68	lui $4,%hi(_end)
69	addiu $4,$4,%lo(_end)
70	lui $5,%hi(_heap_size)
71	addiu $5,$5,%lo(_heap_size)
72	syscall
73	nop
74
75	# Cache
76	jal FlushCache
77	move $4,$0
78
79	# Jump main
80	ei
81
82	lui $2,%hi(_args_ptr)
83	addiu $2,$2,%lo(_args_ptr)
84	lw $3,($2)
85	lui $2,%hi(_args)
86	addiu $2,$2,%lo(_args)
87
88	lw $4, ($2)
89	jal main
90	addiu $5, $2, 4
91	_root:
92	_exit:
93	# ???
94	# lui $2,%hi(_args_ptr)
95	# addiu $2,$2,%lo(_args_ptr)
96	# lw $3,($2)
97	# jal SignalSema
98	# lw $4,($3)
99	# Exit
100	# addiu $3,$0,35
101	# syscall
102	jr $31
103	nop
104
105	.bss
106	.align 6
107	_args: .space 256+16*4+4
108
109	.data
110	_args_ptr:
111	.space 4