272 lines
3.4 KiB
Plaintext
272 lines
3.4 KiB
Plaintext
|
opt at-,c+
|
||
|
|
|
||
|
|
xref exc_c
|
||
|
|
|
||
|
|
xdef install_exc
|
||
|
|
xdef uninstall_exc
|
||
|
|
xdef reg_lst
|
||
|
|
xdef dev_kit
|
||
|
|
|
||
|
|
rsreset
|
||
|
|
|
||
|
|
OFS_AT rw 1
|
||
|
|
OFS_V0 rw 1
|
||
|
|
OFS_V1 rw 1
|
||
|
|
OFS_A0 rw 1
|
||
|
|
OFS_A1 rw 1
|
||
|
|
OFS_A2 rw 1
|
||
|
|
OFS_A3 rw 1
|
||
|
|
OFS_T0 rw 1
|
||
|
|
OFS_T1 rw 1
|
||
|
|
OFS_T2 rw 1
|
||
|
|
OFS_T3 rw 1
|
||
|
|
OFS_T4 rw 1
|
||
|
|
OFS_T5 rw 1
|
||
|
|
OFS_T6 rw 1
|
||
|
|
OFS_T7 rw 1
|
||
|
|
OFS_S0 rw 1
|
||
|
|
OFS_S1 rw 1
|
||
|
|
OFS_S2 rw 1
|
||
|
|
OFS_S3 rw 1
|
||
|
|
OFS_S4 rw 1
|
||
|
|
OFS_S5 rw 1
|
||
|
|
OFS_S6 rw 1
|
||
|
|
OFS_S7 rw 1
|
||
|
|
OFS_T8 rw 1
|
||
|
|
OFS_T9 rw 1
|
||
|
|
OFS_GP rw 1
|
||
|
|
OFS_SP rw 1
|
||
|
|
OFS_FP rw 1
|
||
|
|
OFS_RA rw 1
|
||
|
|
OFS_HI rw 1
|
||
|
|
OFS_LO rw 1
|
||
|
|
OFS_SR rw 1
|
||
|
|
OFS_CA rw 1
|
||
|
|
OFS_EPC rw 1
|
||
|
|
|
||
|
|
section .text
|
||
|
|
|
||
|
|
;-------------------------------- install_exc ----------------------------
|
||
|
|
install_exc
|
||
|
|
|
||
|
|
la t0,exc_onoff
|
||
|
|
lw t1,0(t0)
|
||
|
|
nop
|
||
|
|
beqz t1,exc_off
|
||
|
|
nop
|
||
|
|
jr ra
|
||
|
|
nop
|
||
|
|
exc_off li t1,1
|
||
|
|
sw t1,0(t0)
|
||
|
|
|
||
|
|
;detect dev_kit
|
||
|
|
la t0,dev_kit
|
||
|
|
lw t1,0(t0)
|
||
|
|
nop
|
||
|
|
bgez t1,dev_2 ;just chk once
|
||
|
|
nop
|
||
|
|
lw t1,$80(zero)
|
||
|
|
move t2,zero
|
||
|
|
lui t3,$3c1a
|
||
|
|
or t3,t3,$1fa0
|
||
|
|
beq t1,t3,dev_0 ;DTL-H2000
|
||
|
|
lui t3,$3c1a
|
||
|
|
or t3,t3,$1fc2
|
||
|
|
beq t1,t3,dev_0 ;DTL-H2500
|
||
|
|
nop
|
||
|
|
b dev_1
|
||
|
|
nop
|
||
|
|
dev_0 li t2,1
|
||
|
|
dev_1 sw t2,0(t0)
|
||
|
|
dev_2
|
||
|
|
|
||
|
|
;install new exception-handler
|
||
|
|
|
||
|
|
; mfc0 v0,SR
|
||
|
|
dw $40026000
|
||
|
|
lui at,$ffff
|
||
|
|
or at,at,$00fc ;mask off IM,KUc,IEc
|
||
|
|
and at,at,v0
|
||
|
|
; mtc0 at,SR
|
||
|
|
dw $40816000
|
||
|
|
nop
|
||
|
|
|
||
|
|
li t0,$80
|
||
|
|
la t1,old_handler
|
||
|
|
|
||
|
|
lw t2,0(t0)
|
||
|
|
lw t3,4(t0)
|
||
|
|
lw t4,8(t0)
|
||
|
|
lw t5,12(t0)
|
||
|
|
sw t2,0(t1)
|
||
|
|
sw t3,4(t1)
|
||
|
|
sw t4,8(t1)
|
||
|
|
sw t5,12(t1)
|
||
|
|
la t1,new_exc_code
|
||
|
|
lw t2,0(t1)
|
||
|
|
lw t3,4(t1)
|
||
|
|
lw t4,8(t1)
|
||
|
|
lw t5,12(t1)
|
||
|
|
sw t2,0(t0)
|
||
|
|
sw t3,4(t0)
|
||
|
|
sw t4,8(t0)
|
||
|
|
sw t5,12(t0)
|
||
|
|
|
||
|
|
; mtc0 v0,SR ;restore irq
|
||
|
|
dw $40826000
|
||
|
|
nop
|
||
|
|
jr ra
|
||
|
|
nop
|
||
|
|
|
||
|
|
new_exc_code
|
||
|
|
la k0,exc_asm
|
||
|
|
jr k0
|
||
|
|
nop
|
||
|
|
|
||
|
|
;------------------------------- uninstall_exc ----------------------------
|
||
|
|
uninstall_exc
|
||
|
|
|
||
|
|
la t0,exc_onoff
|
||
|
|
lw t1,0(t0)
|
||
|
|
nop
|
||
|
|
bnez t1,exc_on
|
||
|
|
nop
|
||
|
|
jr ra
|
||
|
|
nop
|
||
|
|
exc_on li t1,0
|
||
|
|
sw t1,0(t0)
|
||
|
|
|
||
|
|
; mfc0 v0,SR
|
||
|
|
dw $40026000
|
||
|
|
lui at,$ffff
|
||
|
|
or at,at,$00fc ;mask off IM,KUc,IEc
|
||
|
|
and at,at,v0
|
||
|
|
; mtc0 at,SR
|
||
|
|
dw $40816000
|
||
|
|
nop
|
||
|
|
|
||
|
|
la t0,old_handler
|
||
|
|
li t1,$80
|
||
|
|
|
||
|
|
lw t2,0(t0)
|
||
|
|
lw t3,4(t0)
|
||
|
|
lw t4,8(t0)
|
||
|
|
lw t5,12(t0)
|
||
|
|
sw t2,0(t1)
|
||
|
|
sw t3,4(t1)
|
||
|
|
sw t4,8(t1)
|
||
|
|
sw t5,12(t1)
|
||
|
|
|
||
|
|
; mtc0 v0,SR ;restore irq
|
||
|
|
dw $40826000
|
||
|
|
nop
|
||
|
|
jr ra
|
||
|
|
nop
|
||
|
|
|
||
|
|
;------------------------------- exc_asm ----------------------------
|
||
|
|
exc_asm
|
||
|
|
|
||
|
|
; mfc0 k0,Cause
|
||
|
|
dw $401a6800
|
||
|
|
nop
|
||
|
|
li k1,%1111011111110
|
||
|
|
|
||
|
|
srl k0,k0,2
|
||
|
|
andi k0,k0,$1f
|
||
|
|
srlv k1,k1,k0
|
||
|
|
|
||
|
|
andi k1,k1,1
|
||
|
|
beqz k1,old_handler
|
||
|
|
nop
|
||
|
|
|
||
|
|
;chk break
|
||
|
|
li k1,9
|
||
|
|
bne k0,k1,go_on
|
||
|
|
nop
|
||
|
|
; mfc0 k0,EPC
|
||
|
|
dw $401a7000
|
||
|
|
nop
|
||
|
|
lw k0,0(k0)
|
||
|
|
nop
|
||
|
|
srl k0,k0,16
|
||
|
|
li k1,6
|
||
|
|
beq k0,k1,go_on
|
||
|
|
li k1,7
|
||
|
|
beq k0,k1,go_on
|
||
|
|
nop
|
||
|
|
|
||
|
|
old_handler
|
||
|
|
|
||
|
|
nop
|
||
|
|
nop
|
||
|
|
nop
|
||
|
|
nop
|
||
|
|
|
||
|
|
go_on la k0,reg_save
|
||
|
|
|
||
|
|
sw at,OFS_AT(k0)
|
||
|
|
sw v0,OFS_V0(k0)
|
||
|
|
sw v1,OFS_V1(k0)
|
||
|
|
sw a0,OFS_A0(k0)
|
||
|
|
sw a1,OFS_A1(k0)
|
||
|
|
sw a2,OFS_A2(k0)
|
||
|
|
sw a3,OFS_A3(k0)
|
||
|
|
sw t0,OFS_T0(k0)
|
||
|
|
sw t1,OFS_T1(k0)
|
||
|
|
sw t2,OFS_T2(k0)
|
||
|
|
sw t3,OFS_T3(k0)
|
||
|
|
sw t4,OFS_T4(k0)
|
||
|
|
sw t5,OFS_T5(k0)
|
||
|
|
sw t6,OFS_T6(k0)
|
||
|
|
sw t7,OFS_T7(k0)
|
||
|
|
sw s0,OFS_S0(k0)
|
||
|
|
sw s1,OFS_S1(k0)
|
||
|
|
sw s2,OFS_S2(k0)
|
||
|
|
sw s3,OFS_S3(k0)
|
||
|
|
sw s4,OFS_S4(k0)
|
||
|
|
sw s5,OFS_S5(k0)
|
||
|
|
sw s6,OFS_S6(k0)
|
||
|
|
sw s7,OFS_S7(k0)
|
||
|
|
sw t8,OFS_T8(k0)
|
||
|
|
sw t9,OFS_T9(k0)
|
||
|
|
sw gp,OFS_GP(k0)
|
||
|
|
sw sp,OFS_SP(k0)
|
||
|
|
sw fp,OFS_FP(k0)
|
||
|
|
sw ra,OFS_RA(k0)
|
||
|
|
mfhi k1
|
||
|
|
nop
|
||
|
|
sw k1,OFS_HI(k0)
|
||
|
|
mflo k1
|
||
|
|
nop
|
||
|
|
sw k1,OFS_LO(k0)
|
||
|
|
; mfc0 k1,SR
|
||
|
|
dw $401b6000
|
||
|
|
nop
|
||
|
|
sw k1,OFS_SR(k0)
|
||
|
|
|
||
|
|
; mfc0 k1,Cause
|
||
|
|
dw $401b6800
|
||
|
|
nop
|
||
|
|
sw k1,OFS_CA(k0)
|
||
|
|
|
||
|
|
; mfc0 k1,EPC
|
||
|
|
dw $401b7000
|
||
|
|
nop
|
||
|
|
nop
|
||
|
|
sw k1,OFS_EPC(k0)
|
||
|
|
|
||
|
|
la k0,exc_c
|
||
|
|
jr k0
|
||
|
|
nop
|
||
|
|
|
||
|
|
section .data
|
||
|
|
|
||
|
|
dev_kit dw -1 ;-1=undefined, 0=playstation, 1=devkit
|
||
|
|
exc_onoff dw 0 ;internal exc-handler status onoff-flag
|
||
|
|
reg_lst dw reg_save
|
||
|
|
|
||
|
|
section .bss
|
||
|
|
|
||
|
|
reg_save dsw 34
|
||
|
|
|