SWI Blond Moment

No offence to blonds. ;-)

I should probably be able to figure this out for myself by now; it’s probably something obvious; been staring at this line of code for far too long; blah, blah!

Opening a nested window, this line of code works fine:

_swix(Wimp_OpenWindow, _INR(1,4), &colpanel_open_str, 0x4B534154 /*'TASK'*/, w, 0);

Whereas this line of code causes an immediate data abort:

os_swix4 (Wimp_OpenWindow, &colpanel_open_str, 0x4B534154, w, 0);

I can’t for the life of me spot what’s wrong with it. os_swix4 () expects 5 arguments: the SWI number followed by 4 input values (ints) for R1 to R4, correct?
I made sure bit 0 of my Nesting Flags is zero, so it shouldn’t be trying to read any window flags.

The actual ARM code where the data abort occurs is as follows (PC is at the second line):

dcb “@V”, 0, 0

streq lr,[r0,-r5,lsr #&06]

ldrdcs lr,[r5],-ip,asr r6

R0 = 000859f4

R1 = 4b534154

R2 = 20141e59

R3 = 00000000

R4 = 20190b99

R5 = 20190b99

R6 = 00000000

lr = 000859ec

Hang on, R1 = 4b534154, that should have been in R2! Are all my registers out by one? :-( That’s it, isn’t it?

That was it. As you were.