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#rockbox log for 2017-09-27

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00:05:26***Saving seen data "./dancer.seen"
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01:22:33Bilgusdoes the YPR0 not have a FM Radio?
01:23:45BilgusI was going through the keymaps and noticed the one johnb2 submitted the other day is missing LAST_ITEM_IN_LIST__NEXTLIST(CONTEXT_STD) http://gerrit.rockbox.org/r/#/c/1633/4/apps/keymaps/keymap-ypr0.c
01:24:41Bilgushttps://github.com/Rockbox/rockbox/blob/03dd4b92be7dcd5c8ab06da3810887060e06abd5/apps/keymaps/keymap-ypr0.c#L250
01:25:45BilgusI'm guessing it gets away with it because every action is mapped perhaps or its just overunning the list till the next 0
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01:31:02__builtingrr.. quakie is being all weird again
01:31:06__builtin*quake
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01:39:22__builtinit seems that all the ints in a struct are being truncated to 8 bits...
01:55:01 Quit krabador (Remote host closed the connection)
01:55:33*__builtin scratches his head
01:55:47__builtinis there anything wrong with an unaligned 32-bit load on ARM?
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02:13:26jhMikeSdepends on the ARM version
02:14:57jhMikeSbtw, the core is compiled with short enums which may make compiling without them binary incompatible
02:16:17 Quit Strife1989 (Quit: No Ping reply in 180 seconds.)
02:16:35__builtinI know, but I don't think that's causing the issue at hand
02:16:57__builtinthough I think I'll make the -fno-short-enums flag global to fix that
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02:20:40__builtinhmm, so it seems that if I have an unaligned char pointer to the bytes {72, 1, 0, 0}, and cast that pointer to int*, dereferencing it gives the value 72
02:21:04__builtinso evidently it's an issue with the unaligned access
02:28:32__builtindo you have any idea how I could work around this?
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02:40:16johnb2Bilgus: yes, yp-R0 does have radio. To my defense I can say that I did not touch that section of code.
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03:01:21Mode"#rockbox +o __builtin" by ChanServ (ChanServ@services.)
03:01:24Mode"#rockbox -b PurlingNayuki!*@*$##fix_your_connection" by __builtin (~xray@rockbox/developer/builtin)
03:01:31Mode"#rockbox -o __builtin" by ChanServ (ChanServ@services.)
03:07:10 Quit dys (Ping timeout: 240 seconds)
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03:22:19__builtinit seems using __attribute__((packed)) on the structs containing the array forces gcc to assume the fields are unaligned
03:42:56Bilgusyeah johnb2 It was already like that so apparently it works but it must be just lucky
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04:00:43jhMikeS__builtin: gonna have to piece it together, at least on targets other than armv6 and m68k
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08:55:17wodz__builtin: That's what __attribute__((packed)) is for. It tells compiler to pack struct fields consecutively not taking natural (or abi or whatever) alignment into account.
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12:34:42wodzpamaury: ping
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13:20:50wodzpamaury: I think I understand why rb crashes on ATJ. But for now I don't know how to fix it. http://paste.debian.net/987980/\
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13:23:25TheLemonManwodz, load the registers in reverse order so s0 is clobbered only when you don't need it anymore :P
13:24:14wodzTheLemonMan: The point is this inline assembly is plain wrong.
13:24:44wodzTheLemonMan: It worked by pure luck
13:25:05TheLemonManbecause you don't tell gcc what registers it clobbers
13:25:35wodzTheLemonMan: Not me :P This is pretty old code.
13:26:39wodzThe funny thing is it works in bootloader because compiler (for whatever reason) choose v0 as register to pass address to load_context
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13:31:31TheLemonManwell you could replace the "r" constraint with 2 (iirc that's v0)
13:37:43robertd1how can i enable in a walkman the usb when in rockbox, I held the home button for two seconds but no usb screen?
13:38:51pamauryrobertd1: it's written on the wiki, hold home button until rockbox shuts down, it will go back to the bootloader menu and start usb
13:38:52wodzTheLemonMan: That will not work
13:39:37wodzpamaury: hey!
13:40:12pamaurywodz: can't you write the function entirely in assembly?
13:40:20wodzfor now I did this: http://paste.debian.net/987982/
13:40:22robertd1pamaury, thanks. yes I am using the instructions but only appeared the three options, rockbox, sony and tools
13:40:42pamauryrobertd1: plug the cable!
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13:41:04wodzpamaury: Probably I can. The point is current code is dead broken and works by pure luck
13:41:27wodzand inlining complicates the things.
13:41:28pamaurywodz: can you force the compiler to use a specific register? Will that be enough together with clobbered registers?
13:41:42wodzpamaury: that what I did currently
13:42:19pamauryand is that not a good solution?
13:42:28TheLemonManspecifying a register /or/ using "r" and adding all the clobbered registers to the list will work
13:42:52wodzpamaury: Don't know. It doesn't crash now but doesn't work either
13:43:11pamaurywodz: and have you tried in pure assembly if it works?
13:43:38wodzpamaury: Not yet. I just discovered why it crashes with weird sp values
13:43:43robertd1pamaury thanks
13:44:06wodzpamaury: I thing moving to assmbly is the only solution since mips doesn't support naked attribute
13:45:25wodz*think
13:45:26pamauryI would not really trust the compiler for such a delicate operation and as you mention naked attribute is not supported unfortunately
13:46:00pamauryI was always of the opinion that mips' load_context written like C is trouble
13:46:39pamauryI didn't realize it may be broken because out of the luck the compiler was using s8 when I compiled it on mips and actually looked at the disassembly once
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13:49:26wodzThis still doesn't move me much forward. Now instead of crash It hangs somewhere.
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14:26:20*wodz grumbles
14:35:20pamaurydo you know where it hangs?
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14:43:43wodzpamaury: No
14:44:39wodzpamaury: It hangs before root_menu displaying splash 'Scanning disk...'. But it is kinda random
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14:55:33wodzHmm with dircache commented out I even reach root_menu(). It hangs there however. Menu is displayed correctly so it loaded all graphics and fonts off card correctly.
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