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# This is the start code for the PSXSDK.
# It sets needed things up, and calls the setup and the main function.
# This has to be linked in as the first object when using ld, so that it
# appears at the start of the .text section.
# If a ldscript is being used, it is sufficient to specify this as the first
# startup object.
# nextvolume (2014-03-17):
# fixed possible stack corruption.
.align 16
.text
.global _start
#.global exit
.extern call_atexit_callbacks
#.global vblank_handler
.extern vblank_handler
.extern vblank_handler_callback
.extern rcnt_handler
.extern rcnt_handler_evfield
.extern rcnt_handler_callback
.extern run_bios
.extern is_load_delay_ok
.extern exit
.extern get_cop0_status
.extern set_cop0_status
.extern get_cop0_epc
#.global run_bios
#.global is_load_delay_ok
_start:
li $29, 0x801fff00 # Load stack pointer
li $k1, 0x1f800000 # set to hardware base
addiu $sp, $sp, -24
jal ResetEntryInt
nop
jal psxsdk_setup
nop
jal main
nop
_real_exit:
la $a0, progtermfmt
move $a1, $v0
jal printf
nop
jal call_atexit_callbacks
nop
inf_loop:
j inf_loop
nop
# VBlank handler
vblank_handler:
addi $sp, -120
.set noat
sw $at, 0($sp)
mfhi $at
sw $at, 112($sp)
mflo $at
sw $at, 116($sp)
.set at
sw $v0, 4($sp)
sw $v1, 8($sp)
sw $a0, 12($sp)
sw $a1, 16($sp)
sw $a2, 20($sp)
sw $a3, 24($sp)
sw $t0, 28($sp)
sw $t1, 32($sp)
sw $t2, 36($sp)
sw $t3, 40($sp)
sw $t4, 44($sp)
sw $t5, 48($sp)
sw $t6, 52($sp)
sw $t7, 56($sp)
sw $s0, 60($sp)
sw $s1, 64($sp)
sw $s2, 68($sp)
sw $s3, 72($sp)
sw $s4, 76($sp)
sw $s5, 80($sp)
sw $s6, 84($sp)
sw $s7, 88($sp)
sw $t8, 92($sp)
sw $t9, 96($sp)
sw $gp, 100($sp)
sw $s8, 104($sp)
sw $ra, 108($sp)
vblank_fire_user_handler:
la $t0, vblank_handler_callback
lw $t1, 0($t0)
addiu $sp, $sp, -24
jalr $t1
nop
addiu $sp, $sp, 24
vblank_acknowledge_irq:
li $t0, 0x1f801070 # IPENDING
lw $t1, 0($t0)
nop
nop
xori $t1, $t1, 1 # Acknowledge VBlank IRQ
sw $t1, 0($t0)
vblank_handler_end:
.set noat
lw $at, 112($sp)
nop
mthi $at
lw $at, 116($sp)
nop
mtlo $at
lw $at, 0($sp)
.set at
lw $v0, 4($sp)
lw $v1, 8($sp)
lw $a0, 12($sp)
lw $a1, 16($sp)
lw $a2, 20($sp)
lw $a3, 24($sp)
lw $t0, 28($sp)
lw $t1, 32($sp)
lw $t2, 36($sp)
lw $t3, 40($sp)
lw $t4, 44($sp)
lw $t5, 48($sp)
lw $t6, 52($sp)
lw $t7, 56($sp)
lw $s0, 60($sp)
lw $s1, 64($sp)
lw $s2, 68($sp)
lw $s3, 72($sp)
lw $s4, 76($sp)
lw $s5, 80($sp)
lw $s6, 84($sp)
lw $s7, 88($sp)
lw $t8, 92($sp)
lw $t9, 96($sp)
lw $gp, 100($sp)
lw $s8, 104($sp)
lw $ra, 108($sp)
addi $sp, 120
jr $ra
nop
# Root counter handler
rcnt_handler:
addi $sp, -120
.set noat
sw $at, 0($sp)
mfhi $at
sw $at, 112($sp)
mflo $at
sw $at, 116($sp)
.set at
sw $v0, 4($sp)
sw $v1, 8($sp)
sw $a0, 12($sp)
sw $a1, 16($sp)
sw $a2, 20($sp)
sw $a3, 24($sp)
sw $t0, 28($sp)
sw $t1, 32($sp)
sw $t2, 36($sp)
sw $t3, 40($sp)
sw $t4, 44($sp)
sw $t5, 48($sp)
sw $t6, 52($sp)
sw $t7, 56($sp)
sw $s0, 60($sp)
sw $s1, 64($sp)
sw $s2, 68($sp)
sw $s3, 72($sp)
sw $s4, 76($sp)
sw $s5, 80($sp)
sw $s6, 84($sp)
sw $s7, 88($sp)
sw $t8, 92($sp)
sw $t9, 96($sp)
sw $gp, 100($sp)
sw $s8, 104($sp)
sw $ra, 108($sp)
rcnt_fire_user_handler:
la $t0, rcnt_handler_callback
lw $t1, 0($t0)
addiu $sp, $sp, -24
jalr $t1
nop
addiu $sp, $sp, 24
rcnt_acknowledge_irq:
li $t0, 0x1f801070 # IPENDING
la $t2, rcnt_handler_evfield
lw $t1, 0($t0)
nop
nop
xor $t1, $t1, $t2 # Acknowledge Root Counter IRQ
sw $t1, 0($t0)
rcnt_handler_end:
.set noat
lw $at, 112($sp)
nop
mthi $at
lw $at, 116($sp)
nop
mtlo $at
lw $at, 0($sp)
.set at
lw $v0, 4($sp)
lw $v1, 8($sp)
lw $a0, 12($sp)
lw $a1, 16($sp)
lw $a2, 20($sp)
lw $a3, 24($sp)
lw $t0, 28($sp)
lw $t1, 32($sp)
lw $t2, 36($sp)
lw $t3, 40($sp)
lw $t4, 44($sp)
lw $t5, 48($sp)
lw $t6, 52($sp)
lw $t7, 56($sp)
lw $s0, 60($sp)
lw $s1, 64($sp)
lw $s2, 68($sp)
lw $s3, 72($sp)
lw $s4, 76($sp)
lw $s5, 80($sp)
lw $s6, 84($sp)
lw $s7, 88($sp)
lw $t8, 92($sp)
lw $t9, 96($sp)
lw $gp, 100($sp)
lw $s8, 104($sp)
lw $ra, 108($sp)
addi $sp, 120
jr $ra
nop
get_cop0_status:
mfc0 $v0, $12
jr $ra
nop
set_cop0_status:
mtc0 $a0, $12
jr $ra
nop
get_cop0_epc:
mfc0 $2, $14
jr $ra
nop
run_bios:
j 0xbfc00000
nop
is_load_delay_ok:
li $t2, 0
li $t0, 0x0adecade
la $t1, isldo_data
.word 0x8d2a0000 #lw t2,0(t1)
beq $t0, $t2, load_delay_not_ok
nop
load_delay_ok:
li $v0, 1
jr $ra
nop
load_delay_not_ok:
li $v0, 0
jr $ra
nop
exit:
move $s0, $a0
la $a0, called_exit
move $a1, $s0
addiu $sp, $sp, -24
jal printf
nop
addiu $sp, $sp, 24
move $v0, $s0
j _real_exit
nop
.align 16
.data
called_exit:
.string "Called exit(%d)\n"
progtermfmt:
.string "Program terminated with return value %d\n"
isldo_data:
.word 0x0adecade
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