I just find out how to get in usefull backtrace with android ndk (unfortantly I am also new to the ndk). Now I get: Program received signal SIGSEGV, Segmentation fault. 0x003f05a8 in stg_returnToStackTop () (gdb) bt #0 0x003f05a8 in stg_returnToStackTop () #1 0x003c2e74 in schedule (initialCapability=0x3f059c, task=0x530350) at rts/Schedule.c:463 #2 0x003c2e74 in schedule (initialCapability=0x530340, task=0x400a42f0) at rts/Schedule.c:463 #3 0x003c4c50 in scheduleWaitThread (tso=0x401033c0, ret=0x0, pcap=0xbe89ab6c) at rts/Schedule.c:2345 #4 0x00408544 in rts_evalLazyIO (cap=0xbe89ab6c, p=0x50a020, ret=0x0) at rts/RtsAPI.c:499 #5 0x003c08c8 in real_main () at rts/RtsMain.c:68 #6 0x003c0a54 in hs_main (argc=1, argv=0xbe89abf4, main_closure=0x50a020, rts_config=...) at rts/RtsMain.c:123 #7 0x0000a23c in main () stg_returnToStackTop is defined in rts/StgStartup.cmm (a c-- file). I would guess that jump %ENTRY_CODE(Sp(0)) []; could be the problem. Since p8 $r13 gives me 0xbef00a74: 0x0 (...) Sp(0) would be 0x0, correct? On 01/11/2013 02:16 PM, Simon Marlow wrote:
On 11/01/13 11:36, Nathan Hüsken wrote:
Hi,
I was succesfull in building ghc (pulled from git) to compile for arm-linux-androideabi!
Now using "inplace/bin/ghc-stage1 -dcore-lint -debug" I compiler this Main.hs:
main = putStrLn "Hello, World"
I get an executable, which I can run on my android device. Unfortantly it segfaults.
Running it with ./Main +RTS -DS gives:
cap 0: initialised
Now I am trying to debug this in gdb. When I try to display the stack (which should be in r13 on arm of I understand correctly, I get);
First establish whether the crash is in C or Haskell: what does 'bt' tell you in gdb?
Cheers, Simon
(gdb) p8 $r13 0xbef00a74: 0x0 0xbef00a70: 0x0 0xbef00a6c: 0x3c2e74 0xbef00a68: 0x530350 0xbef00a64: 0x0 0xbef00a60: 0x0 0xbef00a5c: 0x0 0xbef00a58: 0x0
And now I am clueless. So I tried the good old printf debugging in the rts. Using this, I see that it gets before the call to scheduleWaitThread in the function rts_evalLazyIO (in RtsAPI.c).
But when I put a printf in the beginning of scheduleWaitThread (in Schedule.c) it is not shown.
What else can I do to find out more? Thanks! Nathan
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