Is there any way to create alias/variable for memory-related value in Radare 2?

Question

I wonder if it is possible in r2 to make alias for the value that repeats itself many times.

For instance:

I want to have an alias for rbp + rax - 0x1020 to be named as cwd[i]. Can it be done?

I haven't found any similar question before, would be great if it was possible.

This would be very valuable, and is a surprising omission from radare2. — SRobertJames, Commented Apr 3 at 16:14
@SRobertJames Nice that you revived this question. I posted it on the on the official r2 discord, hopefully someone knows how to do it :) — satk0, Commented Apr 3 at 17:09
Great! If you get an answer, please post it here. I'm wondering if there's a hack to do this via macros and command substitution. — SRobertJames, Commented Apr 3 at 18:00
@SRobertJames After discussing it with Pancake, I suggested such a feature on github, check it out (and bump it, pls XD): github.com/radareorg/radare2/issues/22813 — satk0, Commented Apr 9 at 16:57
@SRobertJames I developed a plugin that resolves this issue, check it in a free time. — satk0, Commented May 20 at 14:38

satk0 · Accepted Answer · 2024-09-02 18:07:41Z

So, it turns out, there is no way to do it in Radare2. However, I created a plugin with a huge help from pancake, that allows just that:

Installation is as simple as running:

r2pm -i r2afen

After installing, you must run radare2 with -e asm.parser=afen -e asm.pseudo=true arguments for the plugin to actually work:

r2 -e asm.parser=afen -e asm.pseudo=true <file>

Then, using this plugin, the command that renames rbp + rax - 0x1020 expression to cwd[i] would be the following:

> afen cmd[i] "rbp + rax - 0x1020"

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