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Diambro
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Joined: 12 Sep 2023
Posts: 23
Location: Austria
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 Posted: Sun Sep 29, 2024 10:58 am Post subject: Alloc for variables |
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Hey Community!
Im fond of adding my variables in the already allocated memory. However when im doing Pointers, they sometimes overwrite stuff since they do add/sub ect. commands.
| Code: |
alloc(code,$1000)
....
somevar:
dd 0 //say for a check - switches 0 and 1
somepointer:
dd 0 //gets some address
somepointer2:
dd 0 //sometimes gets overwritten by above one
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Is there a way to bypass that, or should i just alloc new memory for the Pointers?
Thanks in advance!
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ParkourPenguin
I post too much
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Joined: 06 Jul 2014
Posts: 4695
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| Posted: Sun Sep 29, 2024 11:25 am Post subject: |
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Pointers are 8 bytes in 64-bit processes. Use `dq 0` instead
Also if those are allocs and not labels, allocate 8 bytes instead of 4
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I don't know where I'm going, but I'll figure it out when I get there. |
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Diambro
Newbie cheater
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Joined: 12 Sep 2023
Posts: 23
Location: Austria
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| Posted: Mon Sep 30, 2024 3:43 am Post subject: |
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Thanks for the reply!
| ParkourPenguin wrote: | | Pointers are 8 bytes in 64-bit processes. Use `dq 0` instead... |
Overwrite probably was the wrong description, cause i use dq when necessary, but maybe i didnt see it or had a brainlag, ill remember that in the future!
| ParkourPenguin wrote: | | ...Also if those are allocs and not labels, allocate 8 bytes instead of 4 |
Thats the thing, i never alloc anything extra for these pointers. I let them use the memory under the normal code. So i shouldnt do that?
Thanks!
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ParkourPenguin
I post too much
Reputation: 152
Joined: 06 Jul 2014
Posts: 4695
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| Posted: Mon Sep 30, 2024 10:16 am Post subject: |
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Using labels is fine, but you have to use `dq` so CE places the labels at the correct addresses
| Code: | alloc(newmem,1024)
label(foo)
label(bar)
newmem: // 07C00000
foo: // 07C00000
dd 0 // 4 bytes
bar: // 07C00004
dd 0 |
Storing an 8-byte value at `foo` will overwrite the value in `bar`. Use `dq 0` instead and the label `bar` would've been assigned the address 8 bytes after `foo`.
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I don't know where I'm going, but I'll figure it out when I get there. |
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Diambro
Newbie cheater
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Joined: 12 Sep 2023
Posts: 23
Location: Austria
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| Posted: Mon Sep 30, 2024 11:38 am Post subject: |
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Thanks for the easy to understand explanation, gonna remember that.
Thanks again ParkourPenguin!
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