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DSPSpy: save and restore $sr properly

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This commit is contained in:
Tillmann Karras 2020-06-02 01:50:02 +01:00
parent 3118a68246
commit fb041f75e5
3 changed files with 27 additions and 36 deletions
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38
Source/DSPSpy/gba.txt
View File

@ -33,7 +33,7 @@ m0
clr15
;step 1: context setup
call send_back_40
call send_back
call 0x807e ; loop until DSP->CPU mailbox is empty
si @DMBH, #0xdcd1
@ -342,44 +342,44 @@ call send_back
call send_back
set40
call send_back_40
call send_back
lri $AR2, #0x0015
call send_back_40
call send_back
lr $AC0.M, @0x0006
call send_back_40
call send_back
lr $AX0.H, @0x165b
call send_back_40
call send_back
call 0x88e5
call send_back_40
call send_back
asr $ACC0, #-3
call send_back_40
call send_back
lsl $ACC0, #3
call send_back_40
call send_back
srri @$AR2, $AC0.M
call send_back_40
call send_back
srri @$AR2, $AC0.L
call send_back_40
call send_back
lri $AR2, #0x0016
call send_back_40
call send_back
lr $AC0.M, @0x1723
call send_back_40
call send_back
asr $ACC0, #-12
call send_back_40
call send_back
lr $AX0.H, @0x166b
call send_back_40
call send_back
call 0x88e5
call send_back_40
call send_back
tst $ACC0
call send_back_40
call send_back
jge Unk_012e
call send_back_40
call send_back
clr $ACC0
call send_back_40
call send_back
Unk_012e:
asr $ACC0, #-3
call send_back_40
call send_back
set16
;step 4
call send_back

20
Source/DSPSpy/tests/dsp_base.inc
View File

@ -169,10 +169,9 @@ irq:
; DMA:s the current state of the registers back to the PowerPC. To do this,
; it must write the contents of all regs to DRAM.
; Unfortunately, this loop uses ar0 so it's best to use AR1 and friends for testing
; when messing with indexing.
send_back:
; make state safe.
; first, store $sr so we can modify it
sr @(REGS_BASE + 19), $sr
set16
; store registers to reg table
sr @REGS_BASE, $ar0
@ -195,7 +194,8 @@ send_back:
srri @$ar0, $ac0.h
srri @$ar0, $ac1.h
srri @$ar0, $cr
srri @$ar0, $sr
; skip $sr since we already stored and modified it
iar $ar0
srri @$ar0, $prod.l
srri @$ar0, $prod.m1
srri @$ar0, $prod.h
@ -257,7 +257,8 @@ dma_copy:
lrri $ac0.h, @$ar0
lrri $ac1.h, @$ar0
lrri $cr, @$ar0
lrri $sr, @$ar0
; leave $sr for later
iar $ar0
lrri $prod.l, @$ar0
lrri $prod.m1, @$ar0
lrri $prod.h, @$ar0
@ -271,16 +272,9 @@ dma_copy:
lrri $ac0.m, @$ar0
lrri $ac1.m, @$ar0
lr $ar0, @REGS_BASE
lr $sr, @(REGS_BASE+19)
ret ; from send_back
; If you are in set40 mode, use this instead of send_back if you want to stay
; in set40 mode.
send_back_40:
set16
call send_back
set40
ret
; Obviously this must be included directly before your test code
start_of_test:

3
Source/DSPSpy/tests/dsp_test.ds
View File

@ -6,9 +6,6 @@ include "dsp_base.inc"
; We can call send_back at any time to send data back to the PowerPC.
; Calling set40 here seemed to crash the dsp tester in strange ways
; until I added set16 in send_back. Seems clear that it affects something important.
lri $AC0.M, #0x1000
call send_back