33 lines
515 B
ArmAsm
33 lines
515 B
ArmAsm
.include "t-macros.i"
|
|
|
|
start
|
|
|
|
PSW_BITS = PSW_DM
|
|
|
|
;;; Blat our DMAP registers so that they point at on-chip imem
|
|
|
|
ldi r2, MAP_INSN | 0xf
|
|
st r2, @(DMAP_REG,r0)
|
|
ldi r2, MAP_INSN
|
|
st r2, @(IMAP1_REG,r0)
|
|
|
|
;;; Patch the interrupt vector's dbt entry with a jmp to success
|
|
|
|
ldi r4, #trap
|
|
ldi r5, (VEC_DBT & DMAP_MASK) + DMAP_BASE
|
|
ld2w r2, @(0,r4)
|
|
st2w r2, @(0,r5)
|
|
ld2w r2, @(4,r4)
|
|
st2w r2, @(4,r5)
|
|
|
|
test_dbt:
|
|
dbt -> nop
|
|
exit47
|
|
|
|
success:
|
|
checkpsw2 1 PSW_BITS
|
|
exit0
|
|
|
|
.data
|
|
trap: ldi r1, success@word
|
|
jmp r1
|