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| comp.lang.asm.x86 | Ahh, the lost art of x86 assembly | 4,675 messages |
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| Message 3,544 of 4,675 |
| Robert Prins to Bernhard Schornak |
| Re: Converting MMX to XMM [was: XSAVE ar |
| 18 Sep 18 11:05:31 |
From: robert@nospicedham.prino.org On 2018-09-17 20:53, Bernhard Schornak wrote: > Robert Prins wrote: > > >> Tried x65dbg, and tracing into Windows is OK, XMM's are ok, until I hit a: >> >> 74AF2320 | EA 1E27AF74 3300 | jmp far 33:74AF 71E | >> >> which doesn't want to be traced, and which comes back with XMM0, yes, set to >> zero. > > > If your far jump calls a HLL function, XMM0 is a 'volatile' > register. If you need its content after that function call, > you have to preserve it prior to the call and restore it on > re-entry (or use XMM6 ... XMM15). The far jump jumps into Windows itself, and I would expect an OS not to touch my registers. Robert -- Robert AH Prins robert(a)prino(d)org --- SoupGate-Win32 v1.05 * Origin: you cannot sedate... all the things you hate (1:229/2) |
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