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Halsafar

Homebrew Cafe Forum opened

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Homebrew Cafe Forums

The Homebrew Cafe Forum has just been opened. Hop on and register – moderation will be limited to pretty much three guys at the start, but we’ll see where it goes.

It was becoming necessary to have a forum eventually – as people have been meaning to get into contact with me through some means other than unofficial scene forums. This forum will serve a variety of purposes – there is a PS3 emulators section where users can post questions, suggestions, bug reports, requests and whatnot to do with the PS3 emulators. There is also a PC section dedicated to Themaister’s SSNES (and upcoming PC frontend ports). There are also other boards of a more slightly technical bent where porters/devs can get into contact with me or others – or simply idle tech talk if that’s what people prefer.

Android NDK r6 Released

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This is a day late but none the less important to the mobile efforts.  Google released the sixth major version of its native development kit (NDK).  For those who are unaware this allows you to run C/C++ on Android devices and communicate to the Dalvik via the Java Native Interface (JNI).

This release brings us one very cool change for future tablet owners.  You can now build for x86 architecture!  Truly exciting for the next generation of tablets running on Intel chips. (http://gizmodo.com/5551822/intel-oak-trail-is-official-tablet-processors-with-windows-android-and-meego-support).

For developers this release brings a critical new piece of software for the debugging process.  Currently debugging the Java side of things is 100% solved and very easy to use.  However if you need to debug things in native land you are completely sol unless your phone manufacturer left gdb support available on it (or you can root your phone).  The NDK does come with ndk-gdb which is gdb as we all know it.  However some phones like mine (HTC Incredible S) are locked down in some nasty ways that as a side effect broke gdb.  So really all I have to go on is a stack trace which contains all hex addresses and no symbols, only which library the crash occured in.  There are ways to take the stack trace and a decompiled version of your library start to map things out.  This proved cumbersome at best.  Finally Google has released ndk-stack.  This analyzes the stack trace and spits out some meaningful information.

ndk-stack converts this classic stack dump:

I/DEBUG   ( 1272): *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
I/DEBUG   ( 1272): Build fingerprint: 'sasktel_canada_wwe/htc_vivo/vivo/vivo:2.2.1/FRG83D/339842:user/release-keys'
I/DEBUG   ( 1272): pid: 17249, tid: 17273  >>> ca.halsafar.foo <<<
I/DEBUG   ( 1272): signal 11 (SIGSEGV), fault addr 00000000
I/DEBUG   ( 1272):  r0 00000000  r1 80d93b8c  r2 80d94b8c  r3 00008928
I/DEBUG   ( 1272):  r4 80d7d2b0  r5 000168d8  r6 80d94b8c  r7 80d93ab0
I/DEBUG   ( 1272):  r8 00008928  r9 44224f40  10 80d7d378  fp 49e94ed8
I/DEBUG   ( 1272):  ip 00000000  sp 49e94b28  lr 80d2a488  pc 80d516dc  cpsr a0000010
I/DEBUG   ( 1272):  d0  6843646565707361  d1  2f76654464696f6e
I/DEBUG   ( 1272):  d2  65747461626d6167  d3  2e2e2f2f696e6a65
I/DEBUG   ( 1272):  d4  626d616762696c2f  d5  6372732f65747461
I/DEBUG   ( 1272):  d6  2e79726f6d656d2f  d7  293935343a707063
I/DEBUG   ( 1272):  d8  4397000041f00000  d9  43e0000000000000
I/DEBUG   ( 1272):  d10 41dfffffffc00000  d11 c3e0000000000000
I/DEBUG   ( 1272):  d12 0000000000000000  d13 0000000000000000
I/DEBUG   ( 1272):  d14 0000000000000000  d15 0000000000000000
I/DEBUG   ( 1272):  d16 3fe40fd000000000  d17 3e23b592a81fa000
I/DEBUG   ( 1272):  d18 3fe0000000000000  d19 3fe00000013b592b
I/DEBUG   ( 1272):  d20 003f003f003f003f  d21 003f003f003f003f
I/DEBUG   ( 1272):  d22 0006000300070002  d23 0006000300070002
I/DEBUG   ( 1272):  d24 0101010101010101  d25 0000000000000000
I/DEBUG   ( 1272):  d26 0000000000000000  d27 0000000000000000
I/DEBUG   ( 1272):  d28 0000000000000000  d29 0000000000000000
I/DEBUG   ( 1272):  d30 001f001f001f001f  d31 001f001f001f001f
I/DEBUG   ( 1272):  scr 20000012
I/DEBUG   ( 1272):
I/DEBUG   ( 1272):          #00  pc 000516dc  /data/data/ca.halsafar.foo/lib/libfoo.so
I/DEBUG   ( 1272):          #01  pc 000171f4  /system/lib/libdvm.so
I/DEBUG   ( 1272):          #02  pc 00045a78  /system/lib/libdvm.so
I/DEBUG   ( 1272):          #03  pc 0004b25a  /system/lib/libdvm.so
I/DEBUG   ( 1272):          #04  pc 0001c160  /system/lib/libdvm.so
I/DEBUG   ( 1272):          #05  pc 00022ed4  /system/lib/libdvm.so
I/DEBUG   ( 1272):          #06  pc 00021d70  /system/lib/libdvm.so
I/DEBUG   ( 1272):          #07  pc 0005d860  /system/lib/libdvm.so
I/DEBUG   ( 1272):          #08  pc 0005da90  /system/lib/libdvm.so
I/DEBUG   ( 1272):          #09  pc 000507cc  /system/lib/libdvm.so
I/DEBUG   ( 1272):          #10  pc 00011014  /system/lib/libc.so
I/DEBUG   ( 1272):          #11  pc 00010b00  /system/lib/libc.so
I/DEBUG   ( 1272):
I/DEBUG   ( 1272): code around pc:
I/DEBUG   ( 1272): 80d516bc a0600002 b3a00000 e28550d8 e7840005
I/DEBUG   ( 1272): 80d516cc e28710dc e1a02006 e1a03008 e1a0000c
I/DEBUG   ( 1272): 80d516dc e59cc000 e1a0e00f e59cf00c e59f1054
I/DEBUG   ( 1272): 80d516ec e1a03080 e59f0050 e3a02b5a e282c0c8
I/DEBUG   ( 1272): 80d516fc e784300c e08f2000 e08f1001 e3a00003
I/DEBUG   ( 1272):
I/DEBUG   ( 1272): code around lr:
I/DEBUG   ( 1272): 80d2a468 e1a01082 ebffffb9 e1a06000 e5940000
I/DEBUG   ( 1272): 80d2a478 e3a01a05 e2813030 e7901003 eb0009e3
I/DEBUG   ( 1272): 80d2a488 e3560000 a04060c6 e5850000 e1a00006
I/DEBUG   ( 1272): 80d2a498 e8bd8070 e92d4010 e1a04000 e5900000
I/DEBUG   ( 1272): 80d2a4a8 e3500000 0a000002 eb0020df e5940000
I/DEBUG   ( 1272):
I/DEBUG   ( 1272): stack:
I/DEBUG   ( 1272):     49e94ae8  80d93ab0
I/DEBUG   ( 1272):     49e94aec  80d7d378  /data/data/ca.halsafar.foo/lib/libfoo.so
I/DEBUG   ( 1272):     49e94af0  44224f40
I/DEBUG   ( 1272):     49e94af4  80d7d378  /data/data/ca.halsafar.foo/lib/libfoo.so
I/DEBUG   ( 1272):     49e94af8  49e94ed8
I/DEBUG   ( 1272):     49e94afc  80d33d78  /data/data/ca.halsafar.foo/lib/libfoo.so
I/DEBUG   ( 1272):     49e94b00  0026a148  [heap]
I/DEBUG   ( 1272):     49e94b04  80d93b84
I/DEBUG   ( 1272):     49e94b08  80db9088
I/DEBUG   ( 1272):     49e94b0c  80d93b84
I/DEBUG   ( 1272):     49e94b10  ffffffff
I/DEBUG   ( 1272):     49e94b14  80d93ab0
I/DEBUG   ( 1272):     49e94b18  80d7d2b0  /data/data/ca.halsafar.foo/lib/libfoo.so
I/DEBUG   ( 1272):     49e94b1c  000168d8  [heap]
I/DEBUG   ( 1272):     49e94b20  df002777
I/DEBUG   ( 1272):     49e94b24  e3a070ad
I/DEBUG   ( 1272): #00 49e94b28  80d93b84
I/DEBUG   ( 1272):     49e94b2c  00000000
I/DEBUG   ( 1272):     49e94b30  00300298  [heap]
I/DEBUG   ( 1272):     49e94b34  49e94b70
I/DEBUG   ( 1272):     49e94b38  00000000
I/DEBUG   ( 1272):     49e94b3c  479790a0  /dev/ashmem/mspace/dalvik-heap/2 (deleted)
I/DEBUG   ( 1272):     49e94b40  44224f48
I/DEBUG   ( 1272):     49e94b44  49e94b50
I/DEBUG   ( 1272):     49e94b48  44224f2c
I/DEBUG   ( 1272):     49e94b4c  80a171f8  /system/lib/libdvm.so
I/DEBUG   ( 1272): #01 49e94b50  0027e3f0  [heap]
I/DEBUG   ( 1272):     49e94b54  41aaecec  /dev/ashmem/dalvik-LinearAlloc (deleted)
I/DEBUG   ( 1272):     49e94b58  479790a0  /dev/ashmem/mspace/dalvik-heap/2 (deleted)
I/DEBUG   ( 1272):     49e94b5c  44224f40
I/DEBUG   ( 1272):     49e94b60  80a173c0  /system/lib/libdvm.so
I/DEBUG   ( 1272):     49e94b64  0027e3f0  [heap]
I/DEBUG   ( 1272):     49e94b68  49e94b70
I/DEBUG   ( 1272):     49e94b6c  80a45a7b  /system/lib/libdvm.so

Into this:

Stack frame #00  pc 000516dc  /data/data/ca.halsafar.foo/lib/libfoo.so: Routine step in /home/halsafar/androidDev/foo/jni//Application.cpp:469
Stack frame #01  pc 000171f4  /system/lib/libdvm.so
Stack frame #02  pc 00045a78  /system/lib/libdvm.so
Stack frame #03  pc 0004b25a  /system/lib/libdvm.so
Stack frame #04  pc 0001c160  /system/lib/libdvm.so
Stack frame #05  pc 00022ed4  /system/lib/libdvm.so
Stack frame #06  pc 00021d70  /system/lib/libdvm.so
Stack frame #07  pc 0005d860  /system/lib/libdvm.so
Stack frame #08  pc 0005da90  /system/lib/libdvm.so
Stack frame #09  pc 000507cc  /system/lib/libdvm.so
Stack frame #10  pc 00011014  /system/lib/libc.so
Stack frame #11  pc 00010b00  /system/lib/libc.so

I have not posted any information on the mobile side so far. Consider this a first step into getting into the habit of posting. The plan is to bring all the Android ports inline with the the PS3 ones.

Halsafar