[N3DS PORT] Segfault when building rockbox with native thread implementation.

[gama]

Hello, I have made some progress on the 3DS hosted port.   I am currently replacing all SDL code with libctru calls, so the app wont depend on SDL.

Rockbox with SDL threads is working fine.  But I wanted to try the native ARM thread implementation.

The app runs but I am getting the following segfault:

Code: [Select]

luma3ds_exception_dump_parser dumps/crash_dump_00000082.dmp
Processor: Arm11 (core 0)
Exception type: data abort
Fault status: Translation - Page
Current process: 3dsx_app (000400000d921e00)

Register dump:

r0             00433854            r1             00000000           
r2             21545624            r3             00000000           
r4             00155838            r5             00433780           
r6             004337bc            r7             004341a0           
r8             00000000            r9             00000000           
r10            00000000            r11            00000000           
r12            00000000            sp             00000000           
lr             0016045c            pc             00155838           

cpsr           200f0010            dfsr           00000807           
ifsr           0000100f            far            fffffff8           
fpexc          40000700            fpinst         eefc7bc6           
fpinst2        eefc7bc6           
FAR            fffffff8            Access type: Write

Code dump:

  1557dc: e59f204c ldr r2, [pc, #76] @ 0x155830
  1557e0: e58d3004 str r3, [sp, #4]
  1557e4: e1a00007 mov r0, r7
  1557e8: eb024c08 bl 0x1e8810
  1557ec: e5943000 ldr r3, [r4]
  1557f0: e1a02005 mov r2, r5
  1557f4: e5933014 ldr r3, [r3, #20]
  1557f8: e1a01005 mov r1, r5
  1557fc: e59f0030 ldr r0, [pc, #48] @ 0x155834
  155800: e5847178 str r7, [r4, #376] @ 0x178
  155804: eb0006e7 bl 0x1573a8
  155808: e594318c ldr r3, [r4, #396] @ 0x18c
  15580c: e0800080 add r0, r0, r0, lsl #1
  155810: e0800006 add r0, r0, r6
  155814: e1530000 cmp r3, r0
  155818: a584518c strge r5, [r4, #396] @ 0x18c
  15581c: aaffffd4 bge 0x155774
  155820: e3a09000 mov r9, #0
  155824: eaffffd3 b 0x155778
  155828: 003ff868 eorseq pc, pc, r8, ror #16
  15582c: 00222a8c eoreq r2, r2, r12, lsl #21
  155830: 00221380 eoreq r1, r2, r0, lsl #7
  155834: 00222aa0 eoreq r2, r2, r0, lsr #21
  155838: e92d4080 push {r7, lr}


Stack dump:

The app crashes at firmware/scroll_engine.c line 183.  Exactly at the beggining of the scroll_thread function.

Does any rockbox dev have an idea of what is causing this?  And would be any advantage from using the native thread implementation rather than the SDL one?

FYI, the only change I made to the native thread code was replacing ldmiane with ldmneia in firmware/asm/arm/thread.c, since it won't compile otherwise.

Best.