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|    comp.lang.asm.x86    |    Ahh, the lost art of x86 assembly    |    4,675 messages    |
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|    Message 4,406 of 4,675    |
|    wolfgang kern to R.Wieser    |
|    Re: FPU (x87) code debugging.    |
|    08 Aug 21 16:35:02    |
      From: nowhere@nospicedham.never.at              On 08.08.2021 16:00, R.Wieser wrote:              >> you seem to work with 32 bit:              > I am. Didn't think it would matter much.              >> 0F AE 07 FXSAVE [edi]              > I just tried that one, and it worked ! (got 288 bytes of data though, not       > 512) As a result I'm now thoroughly confused in regard to the mod, reg, r/m       > encoding. I tried different ones, but only got crashes.              IIRC we got 288 bytes with FSAVE long, 512 bytes may be just the       required buffer size.              >> you used 27, so I were confused and had you look at my AMD docs,       > That value was suggested by Robert (in his code). And as I didn't get       > anywhere ...              > Oh blimy - I don't know how I did it, but I just noticed that I somehow       > mixed up the 16 and 32-bit mod/reg/rm encodings. With the MOD and REG both       > being zero the by R/M targetted registers are rather different between them.       > :-|              > Bottom line: I made a stupid mistake, created non-working code and got       > myself confused as a result. And as I presumptiously forgot to mention the       > basics of what I was busy with (32-bit coding) I did really help you guys       > find the cause of it. My apologies for that.              I was once there as well :) experience can't be bought!       just fine that we could help, no need for apology.       __       wolfgang              --- SoupGate-Win32 v1.05        * Origin: you cannot sedate... all the things you hate (1:229/2)    |
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