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cmp with more than 1 offset

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Turkeychopio
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Posted: Sun May 09, 2021 11:23 am Post subject: cmp with more than 1 offset

What's the syntax for cmp's in assembler with more than one offset? Such as RSI offset 0 = 28, offset 1 = 4, offset 2 = 8 I've tried cmp [rsi+28+4+8] and [rsi+28]+4]+8]

TheyCallMeTim13
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Posted: Sun May 09, 2021 12:32 pm Post subject: Re: cmp with more than 1 offset

Turkeychopio wrote:

What's the syntax for cmp's in assembler with more than one offset?

Such as RSI offset 0 = 28, offset 1 = 4, offset 2 = 8

I've tried cmp [rsi+28+4+8] and [rsi+28]+4]+8]

You have to iterate through the pointer.

Code:

push rax
mov rax,[rsi+28]
test rax,rax
jz @f
mov rax,[rax+4]
test rax,rax
jz @f
cmp [rax+8],0
@@:
pop rax

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Turkeychopio
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Posted: Sun May 09, 2021 1:39 pm Post subject: Re: cmp with more than 1 offset

TheyCallMeTim13 wrote:

You have to iterate through the pointer.

Code:

push rax
mov rax,[rsi+28]
test rax,rax
jz @f
mov rax,[rax+4]
test rax,rax
jz @f
cmp [rax+8],0
@@:
pop rax

Is this always the syntax I should always use?

This is my context below, I need to cmp rsi+4C+28+4

Code:

newmem:
cmp [rsi+4C],0
jne code
movss [rsi+14],xmm2
jmp return

code:
mov [rsi+14],(float)1600
jmp return

INJECT:
jmp newmem
return:

So would it be like this?

Code:

newmem:
push rax
mov rax,[rsi+4C]
test rax,rax
jz @f
mov rax, [rax+28]
test rax,rax
jz @f
cmp [rax+4],0
jne code
movss [rsi+14],xmm2
pop rax
jmp return

code:
mov [rsi+14],(float)1600
jmp return

INJECT:
jmp newmem
return:

TheyCallMeTim13
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Posts: 976
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Posted: Sun May 09, 2021 2:29 pm Post subject: Re: cmp with more than 1 offset

Turkeychopio wrote:

...

Move the POP so it's always ran, for any PUSH you want a matching POP, which would be missing if jumping to "code".

Code:

newmem:
push rax
mov rax,[rsi+4C]
test rax,rax
jz @f
mov rax, [rax+28]
test rax,rax
jz @f
cmp [rax+4],0
pop rax
jne code
movss [rsi+14],xmm2
jmp return

code:
mov [rsi+14],(float)1600
jmp return

INJECT:
jmp newmem
return:

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Turkeychopio
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Joined: 06 Aug 2014
Posts: 36

Posted: Sun May 09, 2021 2:42 pm Post subject:

Thanks a lot for help

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