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| 02:03.37 | raduga | hi |
| 02:03.54 | kergoth | heh |
| 02:04.11 | raduga | so, is pxa little endian or big endian? |
| 02:04.37 | kergoth | little |
| 02:04.48 | raduga | I've been trying to track down some problems, with a number of applications originally targetted for i386, and they seem to break at places where endianness changes. |
| 02:05.07 | kergoth | could be alignment problems. try disabling alignment fixups in /proc |
| 02:05.11 | raduga | kergoth: so, theoretically code that targets i386 endian should work? |
| 02:05.12 | raduga | hmm |
| 02:05.13 | kergoth | or enabling, for that matter |
| 02:05.14 | raduga | ok |
| 02:05.25 | raduga | kergoth: how do I do that? |
| 02:05.38 | kergoth | it can be setup to send a signal (SIGBUS), warn (message in dmesg/console), fixup (fix the alignment problems.. its slow), or some combination of those |
| 02:05.49 | kergoth | there's a link about alignment at www.arm.linux.org.uk in the developer section |
| 02:05.57 | raduga | thanks. |
| 02:06.00 | kergoth | np |
| 02:06.12 | kergoth | dunno if thats it, but thats the first possibility that comes to mind |
| 02:06.13 | raduga | kergoth: is this a kernel compile-time option? |
| 02:06.23 | kergoth | its a file in /proc you can twiddle to change behavior |
| 02:06.25 | raduga | or something I can sock at /proc at runtime |
| 02:06.26 | raduga | aha |
| 02:06.28 | kergoth | compile time would just chagne the default |
| 02:06.47 | kergoth | i tend to prefer signal+warn myself, to kill the app. i'd rather not _hide_ the problems, i'd rather see them and fix them |
| 02:06.51 | kergoth | heh |
| 02:08.10 | raduga | <PROTECTED> |
| 02:08.16 | kergoth | there ya go |
| 02:08.43 | raduga | not sure how to twiddle it though (yet) |
| 02:08.45 | raduga | contents are: |
| 02:08.45 | raduga | User: 1 |
| 02:08.45 | raduga | System: 25 |
| 02:08.45 | raduga | Skipped: 0 |
| 02:08.45 | raduga | Half: 0 |
| 02:08.45 | raduga | Word: 25 |
| 02:08.47 | raduga | Multi: 0 |
| 02:08.49 | raduga | User faults: 0 (ignored) |
| 02:09.23 | kergoth | ignored |
| 02:09.27 | kergoth | its ignoring alignment problems! |
| 02:09.30 | kergoth | bad, very bad |
| 02:10.21 | raduga | echo "bad, very bad" >/proc/pdaXrom/sash |
| 02:10.29 | kergoth | heh, hold up |
| 02:10.57 | raduga | oh, sorry |
| 02:12.44 | kergoth | 3 is fixup+warn |
| 02:12.48 | kergoth | 5 is signal+warn |
| 02:12.52 | raduga | yahoo |
| 02:12.57 | kergoth | just echo that to alignment |
| 02:13.02 | raduga | i'll try fixing :) |
| 02:13.49 | kergoth | arch/arm/mm/alignment.c is the code in question, fyi |
| 02:13.55 | raduga | thanks. |
| 02:13.58 | kergoth | np |
| 02:16.40 | raduga | hrm. no change in app behaviour |
| 02:17.03 | kergoth | heh, was worth a shot |
| 02:17.08 | kergoth | try signal and see if it dies? |
| 02:17.12 | raduga | the application fiddles around with longs, changes to bigendian, dumps to a file |
| 02:17.13 | kergoth | just to be certain |
| 02:17.24 | raduga | and around then segfaults |
| 02:17.58 | kergoth | got a backtrace? |
| 02:18.26 | kergoth | and smack sash next time you see him for leaving it at ignore |
| 02:18.36 | kergoth | it really needs to be either fix or signal. one or the other |
| 02:19.38 | raduga | eh. backtrace? (sorry, my brain is not engaging today) |
| 02:19.45 | kergoth | gdb ./app |
| 02:19.48 | kergoth | (await segfault) |
| 02:19.48 | kergoth | bt |
| 02:20.12 | kergoth | backtrace as in a trace of the calls in the stack at the time the segmentation fault occurs |
| 02:20.12 | kergoth | so you can see wtf it was doing |
| 02:20.16 | raduga | no gdb, yet. |
| 02:20.44 | raduga | (haven't built it for softfloat) |
| 02:20.55 | raduga | willdo |
| 02:21.09 | kergoth | thats what i'd do next, since it clearly isnt something easy :) |
| 02:21.28 | raduga | *nod* |
| 02:22.36 | raduga | if set to signal, should it be giving a SIGBUS before it SIGSEGs out? |
| 02:22.46 | raduga | assuming its an alignment failure |
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| 02:27.02 | raduga | does SEGV suggest alignment failure? or is it really, catchall anything at this point? |
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| 03:02.36 | kergoth | yes, if its signal you should get a sigbus |
| 03:02.57 | kergoth | segmentation fault means you're touching memory that doesnt belong to you. most often a NULL pointer deref or something along those lines |
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| 07:17.38 | kendrick | re |
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| 17:12.24 | zonezeid | Is there are plans to build more software and games to zaurus? |
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| 21:16.38 | raduga | gah. |
| 21:17.09 | raduga | utterly, completely junk: |
| 21:17.10 | raduga | http://www.kuro5hin.org/story/2005/2/1/15359/88712 |
| 21:17.33 | raduga | the premise: " Binary versions of same application does not work on different Linux distributions because they are missing specific version of libs with specific name. Is there a way to solve that?" |
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| 21:18.32 | raduga | but there is no solution. utterly absolutely no way out. I think the author of this article may want to stop trying to build software. |
| 21:19.16 | raduga | oh never mind. its in the mod queue. you probably won't be able to read it. |
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