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realrbn
Expert Cheater
 Reputation: 3
Joined: 22 Jan 2016
Posts: 112
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 Posted: Mon Feb 01, 2016 2:40 pm Post subject: Moving Value into xmm Register |
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Hey, just a quick question.
I want to move a "Double" Value into a xmm Register.
How would I do that?
The Original Code is:
code:
movsd [esi+00000088],xmm0
jmp return
How can I change it to where it will set a Value of let's say 100 to "[esi+00000088]"?
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Zanzer
I post too much
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Joined: 09 Jun 2013
Posts: 3278
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| Posted: Mon Feb 01, 2016 3:33 pm Post subject: |
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| Code: | label(myvar)
newmem:
code:
movsd xmm0,[myvar]
movsd [esi+00000088],xmm0
jmp return
myvar:
dq (double)100 |
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Daijobu
Master Cheater
 Reputation: 13
Joined: 05 Feb 2013
Posts: 301
Location: the Netherlands
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| Posted: Mon Feb 01, 2016 3:34 pm Post subject: |
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MOVSD - Move scalar double-precision floating-point value.
Therefore it moves a 32 bits float value from xmm0 into esi+88.
You can directly move a (float) value into esi+88 in Cheat Engine using for example:
| Code: | | mov [esi+88],(float)100.0 |
If you want to modify an SSE register like xmm0 you have to use an intermediary register.
Edit: Zanzer posted as I was typing this. That and I need better glasses. Derp.
Edit 2: My bad, I need glasses and classes.
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Last edited by Daijobu on Wed Feb 03, 2016 2:57 am; edited 1 time in total |
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mgr.inz.Player
I post too much
 Reputation: 222
Joined: 07 Nov 2008
Posts: 4438
Location: W kraju nad Wisla. UTC+01:00
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| Posted: Tue Feb 02, 2016 4:24 am Post subject: |
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If that value "double" doesn't have fractional part you can use this:
| Code: | push eax
mov eax,100
cvtsi2sd xmm0,eax
pop eax |
or this (converts single to double):
| Code: | push eax
mov eax,(float)123.456
movd xmm0,eax
cvtss2sd xmm0,xmm0
pop eax |
mov [esi+88],(double)100.0 - this won't work
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hhhuut
Grandmaster Cheater
 Reputation: 6
Joined: 08 Feb 2015
Posts: 607
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| Posted: Tue Feb 02, 2016 4:53 am Post subject: |
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| mgr.inz.Player wrote: | mov [esi+88],(double)100.0 - this won't work
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Small addition:
This will only work on a 64bit process ...
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Dark Byte
Site Admin
 Reputation: 470
Joined: 09 May 2003
Posts: 25791
Location: The netherlands
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| Posted: Tue Feb 02, 2016 5:47 am Post subject: |
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Not in 64-bit either. Most instructions in 64-bit can still only encode 32-bit values.
what does work:
| Code: |
mov rax,(double)100.0
mov [esi+88],rax
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realrbn
Expert Cheater
Reputation: 3
Joined: 22 Jan 2016
Posts: 112
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| Posted: Tue Feb 02, 2016 6:20 am Post subject: |
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| Zanzer wrote: | | Code: | label(myvar)
newmem:
code:
movsd xmm0,[myvar]
movsd [esi+00000088],xmm0
jmp return
myvar:
dq (double)100 |
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Thanks Man, works!
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hhhuut
Grandmaster Cheater
Reputation: 6
Joined: 08 Feb 2015
Posts: 607
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| Posted: Tue Feb 02, 2016 8:23 am Post subject: |
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| Dark Byte wrote: | | Not in 64-bit either. Most instructions in 64-bit can still only encode 32-bit values. |
Hm, I've already seen something like
| Code: | | mov qword ptr [register+offset],1234567890 |
so I thought that can be said for 64bit in general ... Obviously wrong 
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