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How to Read XMM0 In Breakpoint Handler

 
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lylcheat
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PostPosted: Wed Apr 01, 2026 4:41 am    Post subject: How to Read XMM0 In Breakpoint Handler Reply with quote
According to some old posts I've found these should give me the content of XMM0 in a breakpoint handler

Code:
 
  :
  debug_getContext(true) ;
  local regXMM0=byteTableToDouble(XMM0);
  print(string.format("..result from xmm0:%f",regXMM0));
 i, v in ipairs(XMM0) do
  print("Byte " .. i .. ": " .. v)
end
:


But instead, float 0.0 is printed, and all the bytes in the XMM0 table are 0x00. Is my understanding incorrect?

Last edited by lylcheat on Wed Apr 01, 2026 9:51 am; edited 2 times in total
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Dark Byte
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PostPosted: Wed Apr 01, 2026 5:20 am    Post subject: Reply with quote
Which debugger interface do you use and which version of CE?

Assuming the breakpoint you're currently halted on contains a value on the xmm register it should show it.
Is the target 32 bit? If so, it may be in tbe fp register instead
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lylcheat
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PostPosted: Wed Apr 01, 2026 9:43 am    Post subject: Reply with quote
64bit cheat engine 7.6 on 64bit target

Setting:

Preferred breakpoint method
- hardware Breakpoints (Max4)

Debugger Method:
- dbvm-level debugger

Debugger interface config:
- checked: Trigger copy-on-write before activating watches
- checked: Kernelmode breaks (when possible)
- unchecked: targeted process only, unchecked
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Dark Byte
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PostPosted: Wed Apr 01, 2026 9:59 am    Post subject: Reply with quote
ah yes. dbvm level may have an issue there


AMD cpu ?
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lylcheat
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PostPosted: Wed Apr 01, 2026 11:44 am    Post subject: Reply with quote
intel (4th gen Razz )
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