Author: Compynerd255
Posted: 12 Dec 2012 07:22:01 pm (GMT -5)
* bump *
Hi, I edited my last post with my issues. Do you see anything that could be the cause of my calc crashing when I try this?
EDIT: Eureka! I found it! (But I have no idea what to do about it...)
This is the important part of the assembly source (what it should be):
Code:
And here's how that code ends up getting compiled - and compiled very wrongly:
Code:
For some reason, SDCC is writing the wrong address for the jump instruction, causing the >$C000 check to trigger and the calculator to reset. Is there a way I can fix this, or is this a bug in SDCC?
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Posted: 12 Dec 2012 07:22:01 pm (GMT -5)
* bump *
Hi, I edited my last post with my issues. Do you see anything that could be the cause of my calc crashing when I try this?
EDIT: Eureka! I found it! (But I have no idea what to do about it...)
This is the important part of the assembly source (what it should be):
Code:
init:
ld (saved_sp), sp ; save stack pointer
di
;; Initialise global variables
call gsinit
call _main
jp _exit
_exit::
ld sp, (saved_sp) ;restore stack pointer
ld iy, #0x89F0
ei
ret
saved_sp:
.ds 2
gsinit::
retAnd here's how that code ends up getting compiled - and compiled very wrongly:
Code:
9DA1: ld ($9DB9), sp
9DA5: di
9DA6: call $9DF3 ; call gsinit
9DA9: call $9DBB ; call main
9DAC: jp $C9AF ; jp _exit, SHOULD be jp $9DAF
9DAF: ld sp,($9DB9) ; exit code...
9DB3: ld iy,$89F0
9DB7: ei
9DB8: ret
9DB9: .dw $FFC3 ; (saved_sp)
...
9DBB: ret ; main
...
9DF3: ret ; gsinitFor some reason, SDCC is writing the wrong address for the jump instruction, causing the >$C000 check to trigger and the calculator to reset. Is there a way I can fix this, or is this a bug in SDCC?
_________________
Visit Betafreak Games: http://www.betafreak.com
Help Me Pay for College:
- Sign up for Fastweb through my referal link!