| --- Log opened Sat Apr 15 00:00:54 2017 |
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| 00:21 | < RchrdB> | Cross posting here because it's funny: "things to commit just before leaving your job", https://gist.github.com/aras-p/6224951 |
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| 03:19 | | * Vornicus tries to figure out how the hell jerith managed 3 instructions on solid steel gamer, wtf |
| 03:20 | <~Vornicus> | also, 6 yuan, which is slightly less mystifying but nonetheless impressive. |
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| 03:38 | | * McMartin loads a program into his ARM emulator, detonates the entire emulator process |
| 03:46 | <&McMartin> | ... was LDRH a later addition to the architecture? |
| 04:00 | < RchrdB> | This probably isn't exactly on-topic for #code but https://www.youtube.com/watch?v=GZ99gAb4T0o kind of comprises a love letter to UT99's ctf-face and explains why that map was actually so popular. |
| 04:01 | < RchrdB> | and I'm finding it really interesting to watch right now because it's actually all just about physical properties of the art! |
| 04:15 | <&McMartin> | Aha, no, UXTH was. |
| 04:26 | < RchrdB> | McMartin, towards what end are you looking at ARM instructions? :) |
| 04:34 | <&McMartin> | I'm pretty OK with 6502, and 16- and 32-bit x86 |
| 04:34 | <&McMartin> | For the past year and a half all the software I've been paid to write runs on ARM |
| 04:34 | <&McMartin> | It's time I learned that level there. |
| 04:34 | <&McMartin> | That's what the Pi was ultimately for :) |
| 04:35 | <&McMartin> | However, it turns out my easier-to-deal-with simulator on the Windows machine is ARMv5 |
| 04:35 | <&McMartin> | So, uh, some of the instructions don't exist there. >_> |
| 04:36 | <&McMartin> | It turns out the cunning abuse of intrinsic shifts means I can work around that without costing any bytes, so I'm just doing that for now. |
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| 06:16 | <&McMartin> | Correction >_< |
| 06:17 | <&McMartin> | It seems the simulator is ARMv3 |
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| 06:19 | <&McMartin> | That would explain why these instructions fail. OK, that's kinda dumb, but at least gas knows how to flag it. |
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| 06:36 | <&McMartin> | And my working around that defeats gcc's code generator, which is actually a first for me, because ARM code tends to be real frickin' compact |
| 06:52 | < RchrdB> | You're writing software for⦠ah right, phones, of course. |
| 06:53 | < RchrdB> | Is QEMU pleasant to deal with as a simulator? |
| 06:56 | <&McMartin> | I have never gotten QEMU to actually run right. |
| 06:56 | <&McMartin> | I'm using a RISCPC emulator on Windows, and for everything else I have raw hardware. |
| 06:56 | <&McMartin> | I had not until just now realized that Risc PCs were multiple hardware generations behind the GBA. |
| 06:57 | <&McMartin> | This turns out to be due to the incredibly inconsistent hardware serials on ARM chips; ARM710 is v3, while ARM7TDMI is v4. |
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| 06:58 | <&McMartin> | Turns out halfword operations don't exist until v4 |
| 06:58 | <&McMartin> | as for simulation... it's not a coincidence that both major phone OSes have x86 versions of themselves for testing in simulation. |
| 06:59 | <&McMartin> | I get the distinct impression that to get acceptable results you really have to do recompilation/binary-translation and *also* trap for Ultra-HLE-type stuff. |
| 07:03 | <&McMartin> | This is also fun because I'm using an OS in the RISC PC emulator that's aware of all the way up to ARMv8 |
| 07:03 | <&McMartin> | And this means I can bring the entire simulation crashing down from inside BBC BASIC. |
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| 08:05 | <&jeroud> | Vornicus: With guile and cunning, sir. Guile and cunning. |
| 08:06 | <&jeroud> | That is the solution I was talking about when I mentioned feeling dirty. |
| 08:08 | <&jeroud> | It works for three specific input values, but those are the only ones it actually gets. |
| 08:12 | <@abudhabi> | Does Java support some kind of tree structure? Non-binary tree, even. I want something where every node can have 0+ children. |
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| 08:12 | <@abudhabi> | Or do I have to roll my own? |
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| --- Log closed Sun Apr 16 00:00:55 2017 |