May 2012 - iPhone - Haskell.org

ByteString on GHC-iPhone v5
by Stephen Blackheath [to GHC-iPhone] 24 May '12

24 May '12

All, GHC-iPhone is now at https://github.com/mietek/ghc https://github.com/mietek/packages-base https://github.com/mietek/packages-Cabal https://github.com/mietek/hsc2hs https://github.com/mietek/packages-unix I spent a whole lot of time on it and now I know what's going on with the ByteString issue. Here's what's going on: This code is brought in when you reference Data.ByteString.unpack or Data.ByteString.empty: foreign import ccall unsafe "static stdlib.h &free" c_free_finalizer :: FunPtr (Ptr Word8 -> IO ()) This produces this line of ARM assembly: .long _free Presumably because _free isn't in the executable anywhere (linked when it gets started), it adds a flag to the __TEXT section called S_ATTR_EXT_RELOC. You can see this with otool on the TestApp executable deep inside the $HOME/.Xcode directory - the flag's value is 0x00000200. For some reason this makes the dyld loader try to set the text section to be writeable with vm_protect() and the flag VM_PROT_WRITE. This violates the kernel's policy against self-modifying code on the iPhone, and vm_protect() returns with a failure status of 2. So that's what's going on. Why it's happening and how to fix it is next. Steve On 23/05/12 07:34, Carl Joachim Svenn wrote: > * this is a simpler ByteString example failing: > > BS.pack [] `seq` return () > > * command options for clang to target iOS (corrected from previous mail): > > "-arch armv7 -iphoneos_version_min=5.1.0" > > > best regards, > Carl Joachim

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GHC-iPhone v5 patches - Itimer problem fixed
by Stephen Blackheath [to GHC-iPhone] 15 May '12

15 May '12

All, Note: v5 is ready now. This fixes the problem I was having with setitimer interfering with the Objective-C stuff. I re-implemented Itimer.c using a pthread. http://hip-to-be-square.com/~blackh/ghc-iphone-new/v5/ My next task will be to get this onto github. After that I'll get a real Haskell-based OpenGL skeleton app going. (Thanks Carl Joachim Svenn for your assistance.) Steve

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Re: [Haskell-iPhone] GHC-iPhone v4 patches - Builds but needs a little debugging yet
by Stephen Blackheath [to GHC-iPhone] 15 May '12

15 May '12

Jonathan, Actually you just reminded me. There's some package you have to install called "Command line tools" on the latest Xcode, otherwise they don't work. http://guide.macports.org/chunked/installing.xcode.html "After installing Xcode 4.3, the Command Line Tools must be installed. This is done from the Downloads section of Xcode's preferences." Steve On 15/05/12 20:06, Jan Greve wrote: > Hi Jonathan, did you update Xcode recently? The command line tools may > have changed location. > > Sent from my iPhone > > Am 15.05.2012 um 09:44 schrieb Jonathan Fischoff > <jonathangfischoff(a)gmail.com <mailto:jonathangfischoff@gmail.com>>: > >> I had some trouble getting the config.sh to work on lion. It couldn't >> find anything like gcc, ld, etc. >> >> Is there a workaround? >> >> Best, >> Jonathan >> >> On Mon, May 14, 2012 at 9:06 PM, Stephen Blackheath [to GHC-iPhone] >> <likeliest.complexions.stephen(a)blacksapphire.com >> <mailto:likeliest.complexions.stephen@blacksapphire.com>> wrote: >> >> All, >> >> Here's some progress on the new GHC-iPhone cross-compiler. >> README.txt explains how to install it. >> >> http://hip-to-be-square.com/~__blackh/ghc-iphone-new/v4/ >> <http://hip-to-be-square.com/~blackh/ghc-iphone-new/v4/> >> >> >> Steve >> >> _________________________________________________ >> iPhone mailing list >> iPhone(a)haskell.org <mailto:iPhone@haskell.org> >> http://www.haskell.org/__mailman/listinfo/iphone >> <http://www.haskell.org/mailman/listinfo/iphone> >> >> >> _______________________________________________ >> iPhone mailing list >> iPhone(a)haskell.org <mailto:iPhone@haskell.org> >> http://www.haskell.org/mailman/listinfo/iphone

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GHC-iPhone v4 patches - Builds but needs a little debugging yet
by Stephen Blackheath [to GHC-iPhone] 15 May '12

15 May '12

All, Here's some progress on the new GHC-iPhone cross-compiler. README.txt explains how to install it. http://hip-to-be-square.com/~blackh/ghc-iphone-new/v4/ Steve

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