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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! · 壊れてねぇのに直すぞ!日本語でもOK! · He/him.

Tokyo, Japan
marcan.st
Joined May 2009

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    Hector Martin‏ @marcan42 Mar 5

    Color me impressed with Ghidra. Just stuff like this alone is worth it over IDA. No more fumbling over getting function prototype syntax just right to IDA's liking.pic.twitter.com/MQfprAfOuK

    10:51 PM - 5 Mar 2019
    • 50 Retweets
    • 192 Likes
    • cm109 Paulson mathew Edu Garcia Chris Douglas Midbus you are not safe Isaac Whitfield Panther Modern
    6 replies 50 retweets 192 likes
      1. New conversation
      2. Hector Martin‏ @marcan42 Mar 5

        I like that the decompiler calls x86 INT 'swi(x)'. You can tell what architecture they were thinking about when they did that...pic.twitter.com/Nq3hdD5Dce

        1 reply 3 retweets 25 likes
        Show this thread
      3. Hector Martin‏ @marcan42 Mar 5

        Okay, this *desperately* needs IDA's 'highlight everything that matches whatever the cursor is over' thing though. If this isn't implemented (and I just haven't found it yet), this is the very first feature I'd add.pic.twitter.com/dWi6Lsr3Hz

        3 replies 3 retweets 22 likes
        Show this thread
      4. Hector Martin‏ @marcan42 Mar 5

        Ah, you can *manually* trigger it to do backwards or forwards data flow analysis, which is really cool. But I still kind of would rather it do a dumb text match by default without any additional clicks.pic.twitter.com/XbRdgX3NaW

        2 replies 3 retweets 13 likes
        Show this thread
      5. Hector Martin‏ @marcan42 Mar 5

        You can map them to hotkeys though. I could get used to this workflow, but it's too strict (e.g. doesn't work for globals). I just want a dumb "highlight all the same symbol/text" thing...

        2 replies 1 retweet 5 likes
        Show this thread
      6. Hector Martin‏ @marcan42 Mar 5

        Very cool that it has this "project" concept with a bunch of associated files, and you can link them together (e.g. follow refs from one DLL to another).pic.twitter.com/4H9itAtJ8V

        1 reply 0 retweets 10 likes
        Show this thread
      7. Hector Martin‏ @marcan42 Mar 5

        And it's not just an ugly hack that loads another file; the history is seamless, you can go back to where you came from. Cool.

        1 reply 0 retweets 6 likes
        Show this thread
      8. Hector Martin‏ @marcan42 Mar 5

        All the keybindings are configurable, and some of the defaults are just dumb (this used to be Ctrl-Shift-F), so let's fix that.pic.twitter.com/BAAoSaWDVc

        2 replies 1 retweet 10 likes
        Show this thread
      9. Hector Martin‏ @marcan42 Mar 5

        Hector Martin Retweeted Ekho

        Hah, figures it had to be in there somewhere. Honestly it should just do this by default, but I'm cool with middle mouse.https://twitter.com/0Ekho/status/1103191269029736448 …

        Hector Martin added,

        Ekho @0Ekho
        Replying to @marcan42
        I've seen the same complaint a few other places, apparently you just have to click middle mouse?
        2 replies 0 retweets 11 likes
        Show this thread
      10. Hector Martin‏ @marcan42 Mar 5

        The dark theme is... questionable, mostly because Java. It makes the menu bar unreadable. Oh well, I guess I can live with a light theme for now. Someone will probably get annoyed enough to fix this at some point.

        2 replies 0 retweets 12 likes
        Show this thread
      11. Hector Martin‏ @marcan42 Mar 6

        Ah, this is a bit sad. It doesn't know that __chkesp() does not touch ST0, which breaks dataflow analysis of float return values. I can't find a sane way to override it that doesn't involve declaring it as taking a float and returning a float, which would affect *every* call.pic.twitter.com/3IQPnlWFKE

        1 reply 1 retweet 7 likes
        Show this thread
      12. Hector Martin‏ @marcan42 Mar 6

        I wonder if there's a way of customizing clobbers... if it knew __chkesp() does not clobber ST0 it would work. I can make it take an arg at ST0 and return in ST0 and at least get the dataflow, but then that gunks up every function that *doesn't* return a float...

        3 replies 0 retweets 8 likes
        Show this thread
      13. Hector Martin‏ @marcan42 Mar 6

        Fixed it. You can define your own calling conventions easily enough by editing Ghidra/Processors/x86/data/languages/x86win.cspec. I just defined a __fastcall_nofloat that doesn't kill float regs, and it works now.pic.twitter.com/FbwgyQ4dqC

        3 replies 5 retweets 40 likes
        Show this thread
      14. End of conversation
      1. New conversation
      2. Stella Polaris‏ @PolarBernd Mar 6
        Replying to @marcan42

        They really released it... 🤔 I wonder if we can trust the NSA... (especially because it looks like no source code has been released yet)

        2 replies 0 retweets 1 like
      3. Hector Martin‏ @marcan42 Mar 6
        Replying to @PolarBernd

        It seems most, if not all, of the Ghidra components come with a *-src.zip file containing the source.

        2 replies 0 retweets 6 likes
      4. Hector Martin‏ @marcan42 Mar 6
        Replying to @marcan42 @PolarBernd

        Seems the Java bits are largely open source already, but the decompiler is a binary blob written in C++. They're supposed to open source that later.

        1 reply 0 retweets 4 likes
      5. 1 more reply
      1. New conversation
      2. aldelaro5‏ @aldelaro5 Mar 8
        Replying to @marcan42

        So I never really used ida, but what happens in it? curious because when I used it, it seemed pretty standard and nice to me in ghidra.

        1 reply 0 retweets 0 likes
      3. Hector Martin‏ @marcan42 Mar 8
        Replying to @aldelaro5

        IDA just has you type the prototype in pseudo-C syntax with its own weirdness, and if it doesn't like it it just shouts at you. Getting a function prototype into IDA is always a stupid trial and error process.

        1 reply 0 retweets 0 likes
      4. aldelaro5‏ @aldelaro5 Mar 8
        Replying to @marcan42

        oh god..... that sounds very very bad lol

        0 replies 0 retweets 0 likes
      5. End of conversation
      1. Bjoern Kerler‏ @viperbjk Mar 6
        Replying to @marcan42

        try the data type manager. right click on type like int, then "find uses of". lists then all uses of int. with asm and deconpiled line. wow. just wow.

        0 replies 0 retweets 1 like
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