Fwd: Get backtrace at PLT and stepi into PLT

Thinker Li thinker@branda.to
Fri Jul 17 08:47:00 GMT 2009 

Daniel Jacobowitz writes:

 > On Thu, Jul 16, 2009 at 06:18:22PM +0800, User Thinker wrote:
 > > Hi all,
 > >
 > > I have a patch that makes GDB can properly stepi into PLT for ARM
Thumb
 > > instruction.  The patch also allow GDB to perform backtrace at
PLT.
 >
 > What version of GDB are these patches against?  Have you tried the
 > version from CVS?  This should work perfectly.
I tried it with GDB 6.8.  I had just tried the version from CVS this
morning.
It can stepi into PLT, but backtrace is still not work.

I did some tests for GDB.
I configured GDB with command
        configure --build=x86_64-unknown-linux-gnu \
                --host=x86_64-unknown-linux-gnu \
                --target=arm-eabi-linux --disable-werror
for 6.8, CVS, 6.8 with the patch version, and CVS with the patch
version.
I did a test for each version.  All these tests are following the
same commands, basically.
 1. I set a breakpoint at 0xa78c5424
 2. issue 3 stepi commands after inferior being stopped for the
breakpoint.
 3. I also issue backtrace commands if it steps into PLT,
successfully.
Logs for tests are at end of the email.

 >
 > > It means GDB should put a invalid instruction of Thumb version at
 > > base address of the trampoline.  But, it actually puts
 > > ARM version one.  I have checked GDB source code for this issue.
 > > GDB check flags in symbol that contain memory space that
breakpoint
 > > was setted at.  If the symbol is flaged as Thumb, it uses
 > > Thumb version invalid instruction code, or it would use
 > > ARM version.  It is reasonable.  But, the trampoline in PLT
contains
 > > both types of instructions.  And, the result of checking is
 > > the block where the trampoline is in is not Thumb.
 >
 > The CVS version of GDB checks ABI-defined mapping symbols ($a, $t).
 > These also allow disassembly to work correctly.
Cool! It works for me.

 >
 > > If you try to backtrace stack when GDB stop at PLT, you would
 > > get nothing.  It is because no any unwinder can handle code in
PLT.
 >
 > arm_stub_unwinder_sniffer is supposed to handle this case.  It's
been
 > there since 2005, and I've used it successfully.  What's going
wrong
 > with that?
I can not even found arm_stub_unwinder_sniffer in the source tree of
GDB.  So, where is arm_stub_unwinder_sniffer?
Is it part of GDB, officially?

 >
 > > begin 644 arm-plt.diff.gz
 > > M'XL(`#OJ7DH``YU7;4_;2!#^C'_%E)-Z`3O43D*20JDH$"A5"%62ZGKWQ?++
 >
 > Please include patches as text.  See the list archives for
examples.
 > Thanks.

-------------------- patch for 6.8 --------------------
diff -r 3a752b09834a gdb/arm-linux-tdep.c
--- a/gdb/arm-linux-tdep.c      Mon Jul 06 14:17:22 2009 +0800
+++ b/gdb/arm-linux-tdep.c      Fri Jul 17 10:32:20 2009 +0800
@@ -316,6 +316,21 @@ arm_linux_rt_sigreturn_init (const struc
                              + ARM_SIGCONTEXT_R0);
 }

+static void
+arm_linux_plt_init (const struct tramp_frame *self,
+                   struct frame_info *next_frame,
+                   struct trad_frame_cache *this_cache,
+                   CORE_ADDR func)
+{
+  CORE_ADDR sp = frame_unwind_register_unsigned (next_frame,
ARM_SP_REGNUM);
+  CORE_ADDR fake_sp = sp - 4;
+  CORE_ADDR lr = frame_unwind_register_unsigned(next_frame,
ARM_LR_REGNUM);
+  
+  write_memory_unsigned_integer(fake_sp, 4, lr);
+  trad_frame_set_reg_addr(this_cache, ARM_PC_REGNUM, fake_sp);
+  trad_frame_set_id (this_cache, frame_id_build (sp, func));
+}
+
 static struct tramp_frame arm_linux_sigreturn_tramp_frame = {
   SIGTRAMP_FRAME,
   4,
@@ -358,6 +373,23 @@ static struct tramp_frame arm_eabi_linux
   arm_linux_rt_sigreturn_init
 };

+#define ARM_THUMB_BX_PC_INSN 0x00004778
+#define ARM_PLT_ADD_PC_INSN 0xe28fc600
+#define ARM_PLT_ADD_R12_INSN 0xe28cc000
+#define ARM_PLT_LDR_INSN 0xe5bcf000
+static struct tramp_frame arm_eabi_linux_plt_tramp_frame = {
+  GHOST_FRAME,
+  4,
+  {
+    { ARM_THUMB_BX_PC_INSN, 0x0000ffff },
+    { ARM_PLT_ADD_PC_INSN, -1 },
+    { ARM_PLT_ADD_R12_INSN, 0xfffff000 },
+    { ARM_PLT_LDR_INSN, 0xfffff000 },
+    { TRAMP_SENTINEL_INSN }
+  },
+  arm_linux_plt_init
+};
+
 /* Core file and register set support.  */

 #define ARM_LINUX_SIZEOF_GREGSET (18 * INT_REGISTER_SIZE)
@@ -643,6 +675,8 @@ arm_linux_init_abi (struct gdbarch_info
                               
&arm_eabi_linux_sigreturn_tramp_frame);
   tramp_frame_prepend_unwinder (gdbarch,
                               
&arm_eabi_linux_rt_sigreturn_tramp_frame);
+  tramp_frame_prepend_unwinder (gdbarch,
+                               &arm_eabi_linux_plt_tramp_frame);

   /* Core file support.  */
   set_gdbarch_regset_from_core_section (gdbarch,
diff -r 3a752b09834a gdb/arm-tdep.c
--- a/gdb/arm-tdep.c    Mon Jul 06 14:17:22 2009 +0800
+++ b/gdb/arm-tdep.c    Fri Jul 17 10:32:20 2009 +0800
@@ -1677,9 +1677,12 @@ thumb_get_next_pc (struct frame_info *fr
       unsigned short inst2 = read_memory_unsigned_integer (pc + 2,
2);
       offset = (sbits (inst1, 0, 10) << 12) + (bits (inst2, 0, 10) <<
1);
       nextpc = pc_val + offset;
-      /* For BLX make sure to clear the low bits.  */
+      /* For BLX make sure to clear the low bits, but keep LSB
setted.  */
       if (bits (inst2, 11, 12) == 1)
-       nextpc = nextpc & 0xfffffffc;
+       nextpc = (nextpc & 0xfffffffc);
+      else
+       nextpc = nextpc | 1;    /* It would be fail to break on PLT
without
+                                * this.  */
     }
   else if ((inst1 & 0xff00) == 0x4700)     /* bx REG, blx REG */
     {
diff -r 3a752b09834a gdb/frame.c
--- a/gdb/frame.c       Mon Jul 06 14:17:22 2009 +0800
+++ b/gdb/frame.c       Fri Jul 17 10:32:20 2009 +0800
@@ -1458,7 +1458,8 @@ get_prev_frame (struct frame_info *this_
      stop at main, we should at least stop at the entry point of the
      application.  */
   if (!backtrace_past_entry
-      && get_frame_type (this_frame) != DUMMY_FRAME && this_frame-
>level >= 0
+      && get_frame_type (this_frame) != DUMMY_FRAME
+      && get_frame_type (this_frame) != GHOST_FRAME && this_frame-
>level >= 0
       && inside_entry_func (this_frame))
     {
       frame_debug_got_null_frame (gdb_stdlog, this_frame, "inside
entry func");
diff -r 3a752b09834a gdb/frame.h
--- a/gdb/frame.h       Mon Jul 06 14:17:22 2009 +0800
+++ b/gdb/frame.h       Fri Jul 17 10:32:20 2009 +0800
@@ -199,7 +199,10 @@ enum frame_type
   SIGTRAMP_FRAME,
   /* Sentinel or registers frame.  This frame obtains register values
      direct from the inferior's registers.  */
-  SENTINEL_FRAME
+  SENTINEL_FRAME,
+  /* This type of frame is not existed in the stack of inferior.
+     It can be used for frames that similar to sentinel frame.  */
+  GHOST_FRAME
 };

 /* For every stopped thread, GDB tracks two frames: current and
--------------------------------------------------

-------------------- patch for CVS --------------------
diff -r 92c4c442a2c6 gdb/arm-linux-tdep.c
--- a/gdb/arm-linux-tdep.c      Fri Jul 17 09:43:11 2009 +0800
+++ b/gdb/arm-linux-tdep.c      Fri Jul 17 14:17:34 2009 +0800
@@ -321,6 +321,23 @@ arm_linux_rt_sigreturn_init (const struc
                              + ARM_SIGCONTEXT_R0);
 }

+static void
+arm_linux_plt_init (const struct tramp_frame *self,
+                   struct frame_info *this_frame,
+                   struct trad_frame_cache *this_cache,
+                   CORE_ADDR func)
+{
+  CORE_ADDR sp = get_frame_register_unsigned (this_frame,
ARM_SP_REGNUM);
+  CORE_ADDR fake_sp = sp - 4;
+  CORE_ADDR lr = get_frame_register_unsigned(this_frame,
ARM_LR_REGNUM);
+  struct gdbarch *gdbarch = get_frame_arch(this_frame);
+  enum bfd_endian byte_order = gdbarch_byte_order(gdbarch);
+  
+  write_memory_unsigned_integer(fake_sp, 4, byte_order, lr);
+  trad_frame_set_reg_addr(this_cache, ARM_PC_REGNUM, fake_sp);
+  trad_frame_set_id (this_cache, frame_id_build (sp, func));
+}
+
 static struct tramp_frame arm_linux_sigreturn_tramp_frame = {
   SIGTRAMP_FRAME,
   4,
@@ -363,6 +380,23 @@ static struct tramp_frame arm_eabi_linux
   arm_linux_rt_sigreturn_init
 };

+#define ARM_THUMB_BX_PC_INSN 0x00004778
+#define ARM_PLT_ADD_PC_INSN 0xe28fc600
+#define ARM_PLT_ADD_R12_INSN 0xe28cc000
+#define ARM_PLT_LDR_INSN 0xe5bcf000
+static struct tramp_frame arm_eabi_linux_plt_tramp_frame = {
+  GHOST_FRAME,
+  4,
+  {
+    { ARM_THUMB_BX_PC_INSN, 0x0000ffff },
+    { ARM_PLT_ADD_PC_INSN, -1 },
+    { ARM_PLT_ADD_R12_INSN, 0xfffff000 },
+    { ARM_PLT_LDR_INSN, 0xfffff000 },
+    { TRAMP_SENTINEL_INSN }
+  },
+  arm_linux_plt_init
+};
+
 /* Core file and register set support.  */

 #define ARM_LINUX_SIZEOF_GREGSET (18 * INT_REGISTER_SIZE)
@@ -651,6 +685,8 @@ arm_linux_init_abi (struct gdbarch_info
                               
&arm_eabi_linux_sigreturn_tramp_frame);
   tramp_frame_prepend_unwinder (gdbarch,
                               
&arm_eabi_linux_rt_sigreturn_tramp_frame);
+  tramp_frame_prepend_unwinder (gdbarch,
+                               &arm_eabi_linux_plt_tramp_frame);

   /* Core file support.  */
   set_gdbarch_regset_from_core_section (gdbarch,
diff -r 92c4c442a2c6 gdb/frame.c
--- a/gdb/frame.c       Fri Jul 17 09:43:11 2009 +0800
+++ b/gdb/frame.c       Fri Jul 17 14:17:34 2009 +0800
@@ -1650,6 +1650,7 @@ get_prev_frame (struct frame_info *this_
      application.  */
   if (this_frame->level >= 0
       && get_frame_type (this_frame) == NORMAL_FRAME
+      && get_frame_type (this_frame) == GHOST_FRAME
       && !backtrace_past_entry
       && inside_entry_func (this_frame))
     {
diff -r 92c4c442a2c6 gdb/frame.h
--- a/gdb/frame.h       Fri Jul 17 09:43:11 2009 +0800
+++ b/gdb/frame.h       Fri Jul 17 14:17:34 2009 +0800
@@ -207,7 +207,10 @@ enum frame_type
   ARCH_FRAME,
   /* Sentinel or registers frame.  This frame obtains register values
      direct from the inferior's registers.  */
-  SENTINEL_FRAME
+  SENTINEL_FRAME,
+  /* This type of frame is not existed in the stack of inferior.
+     It can be used for frames that similar to sentinel frame.  */
+  GHOST_FRAME
 };

 /* For every stopped thread, GDB tracks two frames: current and
--------------------------------------------------

------------- log for 6.8 -------------------------
warning: Lowest section in /home/thinker/progm/android/out/target/
product/generic/symbols/system/lib/libicudata.so is .hash at 00000094
__ioctl () at bionic/libc/arch-arm/syscalls/__ioctl.S:15
15          ldmfd   sp!, {r4, r7}
Current language:  auto; currently asm
Breakpoint 1 at 0xa78c5424: file external/opencore/engines/player/src/
pv_player_engine.cpp, line 1150.
[New Thread 766]
[Switching to Thread 766]

Breakpoint 1, 0xa78c5424 in PVPlayerEngine::Construct (this=0x12888,
    aCmdStatusObserver=0xed7c, aErrorEventObserver=0xed84,
    aInfoEventObserver=0xed80)
    at external/opencore/engines/player/src/pv_player_engine.cpp:1150
1150        iOOTSyncCommandSem.Create();
1: x/i $pc
0xa78c5424
<_ZN14PVPlayerEngine9ConstructEP23PVCommandStatusObserverP20PVErrorEventObserverP28PVInformationalEventObserver
+32>:      adds    r0, r5, r3
Current language:  auto; currently c++
0xa78c5426      1150        iOOTSyncCommandSem.Create();
1: x/i $pc
0xa78c5426
<_ZN14PVPlayerEngine9ConstructEP23PVCommandStatusObserverP20PVErrorEventObserverP28PVInformationalEventObserver
+34>:      movs    r1, #0
0xa78c5428      1150        iOOTSyncCommandSem.Create();
1: x/i $pc
0xa78c5428
<_ZN14PVPlayerEngine9ConstructEP23PVCommandStatusObserverP20PVErrorEventObserverP28PVInformationalEventObserver
+36>:      bl      0xa785991c

Program received signal SIGSEGV, Segmentation fault.
OsclRegistryClient::UnRegister (this=0x76be00, aComp=@0x0)
    at external/opencore/oscl/oscl/osclregcli/src/
oscl_registry_client.cpp:90
90          if (iTlsImpl)
1: x/i $pc
0xa7361504 <_ZN18OsclRegistryClient10UnRegisterER11OSCL_String+4>:    
   
    ldr r0, [r0, #8]
The program is running.  Exit anyway? (y or n)
warning: Lowest section in /home/thinker/progm/android/out/target/
product/generic/symbols/system/lib/libicudata.so is .hash at 00000094
__ioctl () at bionic/libc/arch-arm/syscalls/__ioctl.S:15
15          ldmfd   sp!, {r4, r7}
Current language:  auto; currently asm
Breakpoint 1 at 0xa78c5424: file external/opencore/engines/player/src/
pv_player_engine.cpp, line 1150.
[New Thread 766]
[Switching to Thread 766]

Breakpoint 1, 0xa78c5424 in PVPlayerEngine::Construct (this=0x12888,
    aCmdStatusObserver=0xed7c, aErrorEventObserver=0xed84,
    aInfoEventObserver=0xed80)
    at external/opencore/engines/player/src/pv_player_engine.cpp:1150
1150        iOOTSyncCommandSem.Create();
1: x/i $pc
0xa78c5424
<_ZN14PVPlayerEngine9ConstructEP23PVCommandStatusObserverP20PVErrorEventObserverP28PVInformationalEventObserver
+32>:      adds    r0, r5, r3
Current language:  auto; currently c++
0xa78c5426      1150        iOOTSyncCommandSem.Create();
1: x/i $pc
0xa78c5426
<_ZN14PVPlayerEngine9ConstructEP23PVCommandStatusObserverP20PVErrorEventObserverP28PVInformationalEventObserver
+34>:      movs    r1, #0
0xa78c5428      1150        iOOTSyncCommandSem.Create();
1: x/i $pc
0xa78c5428
<_ZN14PVPlayerEngine9ConstructEP23PVCommandStatusObserverP20PVErrorEventObserverP28PVInformationalEventObserver
+36>:      bl      0xa785991c

Program received signal SIGSEGV, Segmentation fault.
OsclRegistryClient::UnRegister (this=0x76be00, aComp=@0x0)
    at external/opencore/oscl/oscl/osclregcli/src/
oscl_registry_client.cpp:90
90          if (iTlsImpl)
1: x/i $pc
0xa7361504 <_ZN18OsclRegistryClient10UnRegisterER11OSCL_String+4>:    
   
    ldr r0, [r0, #8]
The program is running.  Exit anyway? (y or n)
----------------------------------------

-------------------- log for cvs --------------------
__ioctl () at bionic/libc/arch-arm/syscalls/__ioctl.S:15
15          ldmfd   sp!, {r4, r7}
Current language:  auto; currently asm
Breakpoint 1 at 0xa78c5424: file external/opencore/engines/player/src/
pv_player_engine.cpp, line 1150.
[Switching to Thread 769]

Breakpoint 1, 0xa78c5424 in PVPlayerEngine::Construct (this=0x12888,
    aCmdStatusObserver=0xed7c, aErrorEventObserver=0xed84,
    aInfoEventObserver=0xed80)
    at external/opencore/engines/player/src/pv_player_engine.cpp:1150
1150        iOOTSyncCommandSem.Create();
1: x/i $pc
0xa78c5424
<_ZN14PVPlayerEngine9ConstructEP23PVCommandStatusObserverP20PVErrorEventObserverP28PVInformationalEventObserver
+32>:      adds    r0, r5, r3
Current language:  auto; currently c++
0xa78c5426      1150        iOOTSyncCommandSem.Create();
1: x/i $pc
0xa78c5426
<_ZN14PVPlayerEngine9ConstructEP23PVCommandStatusObserverP20PVErrorEventObserverP28PVInformationalEventObserver
+34>:      movs    r1, #0
0xa78c5428      1150        iOOTSyncCommandSem.Create();
1: x/i $pc
0xa78c5428
<_ZN14PVPlayerEngine9ConstructEP23PVCommandStatusObserverP20PVErrorEventObserverP28PVInformationalEventObserver
+36>:      bl      0xa785991c
0xa785991c in ?? ()
   from /home/thinker/progm/android/out/target/product/generic/symbols/
system/lib/libopencore_player.so
1: x/i $pc
0xa785991c:     bx      pc
#0  0xa785991c in ?? ()
   from /home/thinker/progm/android/out/target/product/generic/symbols/
system/lib/libopencore_player.so
#0  0xa785991c in ?? ()
   from /home/thinker/progm/android/out/target/product/generic/symbols/
system/lib/libopencore_player.so
The program is running.  Quit anyway (and kill it)? (y or n)
----------------------------------------

-------------------- log for 6.8 with the patch --------------------
warning: Lowest section in /home/thinker/progm/android/out/target/
product/generic/symbols/system/lib/libicudata.so is .hash at 00000094
__ioctl () at bionic/libc/arch-arm/syscalls/__ioctl.S:15
15          ldmfd   sp!, {r4, r7}
Current language:  auto; currently asm
Breakpoint 1 at 0xa78c5424: file external/opencore/engines/player/src/
pv_player_engine.cpp, line 1150.
[New Thread 768]
[Switching to Thread 768]

Breakpoint 1, 0xa78c5424 in PVPlayerEngine::Construct (this=0x134a8,
    aCmdStatusObserver=0xd434, aErrorEventObserver=0xd43c,
    aInfoEventObserver=0xd438)
    at external/opencore/engines/player/src/pv_player_engine.cpp:1150
1150        iOOTSyncCommandSem.Create();
1: x/i $pc
0xa78c5424
<_ZN14PVPlayerEngine9ConstructEP23PVCommandStatusObserverP20PVErrorEventObserverP28PVInformationalEventObserver
+32>:      adds    r0, r5, r3
Current language:  auto; currently c++
0xa78c5426      1150        iOOTSyncCommandSem.Create();
1: x/i $pc
0xa78c5426
<_ZN14PVPlayerEngine9ConstructEP23PVCommandStatusObserverP20PVErrorEventObserverP28PVInformationalEventObserver
+34>:      movs    r1, #0
0xa78c5428      1150        iOOTSyncCommandSem.Create();
1: x/i $pc
0xa78c5428
<_ZN14PVPlayerEngine9ConstructEP23PVCommandStatusObserverP20PVErrorEventObserverP28PVInformationalEventObserver
+36>:      bl      0xa785991c
0xa785991c in ?? ()
   from /home/thinker/progm/android/out/target/product/generic/symbols/
system/lib/libopencore_player.so
1: x/i $pc
0xa785991c:     undefined
#0  0xa785991c in ?? ()
   from /home/thinker/progm/android/out/target/product/generic/symbols/
system/lib/libopencore_player.so
#1  PVPlayerEngine::Construct (this=0x134a8,
aCmdStatusObserver=0xd434,
    aErrorEventObserver=0xd43c, aInfoEventObserver=0xd438)
    at external/opencore/engines/player/src/pv_player_engine.cpp:1151
#2  0xa78ca06c in PVPlayerEngine::New (aCmdStatusObserver=0xd434,
    aErrorEventObserver=0xd43c, aInfoEventObserver=0xd438)
    at external/opencore/engines/player/src/pv_player_engine.cpp:107
#3  0xa78d4b40 in PVPlayerFactory::CreatePlayer
(aCmdStatusObserver=0x135d4,
    aErrorEventObserver=0x0, aInfoEventObserver=0x0)
    at external/opencore/engines/player/src/pv_player_factory.cpp:49
#4  0xa78d8d0e in PlayerDriver::playerThread (this=0x0)
    at external/opencore/android/playerdriver.cpp:870
#5  0xa78d8e10 in PlayerDriver::startPlayerThread (cookie=0x135d4)
    at external/opencore/android/playerdriver.cpp:847
#6  0xa9d285d6 in thread_data_t::trampoline (t=<value optimized out>)
    at frameworks/base/libs/utils/Threads.cpp:109
#7  0xafe0f884 in __thread_entry (
    func=0xa9d2856d <thread_data_t::trampoline(thread_data_t const*)
+1>,
    arg=0xd5a8, tls=0x40407f00) at bionic/libc/bionic/pthread.c:188
#8  0xafe0f3f8 in pthread_create (thread_out=0x0, attr=0xbea5f7f4,
    start_routine=0xa9d2856d <thread_data_t::trampoline(thread_data_t
const*)+1>, arg=0x0) at bionic/libc/bionic/pthread.c:324
#9  0x00000000 in ?? ()
The program is running.  Exit anyway? (y or n)
----------------------------------------

-------------------- log for cvs with patch --------------------
__ioctl () at bionic/libc/arch-arm/syscalls/__ioctl.S:15
15          ldmfd   sp!, {r4, r7}
Current language:  auto; currently asm
Breakpoint 1 at 0xa78c5424: file external/opencore/engines/player/src/
pv_player_engine.cpp, line 1150.
[Switching to Thread 771]

Breakpoint 1, 0xa78c5424 in PVPlayerEngine::Construct (this=0x12a50,
    aCmdStatusObserver=0xeee4, aErrorEventObserver=0xeeec,
    aInfoEventObserver=0xeee8)
    at external/opencore/engines/player/src/pv_player_engine.cpp:1150
1150        iOOTSyncCommandSem.Create();
1: x/i $pc
0xa78c5424
<_ZN14PVPlayerEngine9ConstructEP23PVCommandStatusObserverP20PVErrorEventObserverP28PVInformationalEventObserver
+32>:      adds    r0, r5, r3
Current language:  auto; currently c++
0xa78c5426      1150        iOOTSyncCommandSem.Create();
1: x/i $pc
0xa78c5426
<_ZN14PVPlayerEngine9ConstructEP23PVCommandStatusObserverP20PVErrorEventObserverP28PVInformationalEventObserver
+34>:      movs    r1, #0
0xa78c5428      1150        iOOTSyncCommandSem.Create();
1: x/i $pc
0xa78c5428
<_ZN14PVPlayerEngine9ConstructEP23PVCommandStatusObserverP20PVErrorEventObserverP28PVInformationalEventObserver
+36>:      bl      0xa785991c
0xa785991c in ?? ()
   from /home/thinker/progm/android/out/target/product/generic/symbols/
system/lib/libopencore_player.so
1: x/i $pc
0xa785991c:     bx      pc
#0  0xa785991c in ?? ()
   from /home/thinker/progm/android/out/target/product/generic/symbols/
system/lib/libopencore_player.so
#1  PVPlayerEngine::Construct (this=0x12a50,
aCmdStatusObserver=0xeee4,
    aErrorEventObserver=0xeeec, aInfoEventObserver=0xeee8)
    at external/opencore/engines/player/src/pv_player_engine.cpp:1151
#2  0xa78ca06c in PVPlayerEngine::New (aCmdStatusObserver=0xeee4,
    aErrorEventObserver=0xeeec, aInfoEventObserver=0xeee8)
    at external/opencore/engines/player/src/pv_player_engine.cpp:107
#3  0xa78d4b40 in PVPlayerFactory::CreatePlayer
(aCmdStatusObserver=0x12b7c,
    aErrorEventObserver=0x0, aInfoEventObserver=0x0)
    at external/opencore/engines/player/src/pv_player_factory.cpp:49
#4  0xa78d8d0e in PlayerDriver::playerThread (this=0x0)
    at external/opencore/android/playerdriver.cpp:870
#5  0xa78d8e10 in PlayerDriver::startPlayerThread (cookie=0x12b7c)
    at external/opencore/android/playerdriver.cpp:847
#6  0xa9d285d6 in thread_data_t::trampoline (t=<value optimized out>)
    at frameworks/base/libs/utils/Threads.cpp:109
#7  0xafe0f884 in __thread_entry (
    func=0xa9d2856d <thread_data_t::trampoline(thread_data_t const*)
+1>,
    arg=0xf0e8, tls=0x40507f00) at bionic/libc/bionic/pthread.c:188
#8  0xafe0f3f8 in pthread_create (thread_out=0x0, attr=0xbe9037f4,
    start_routine=0xa9d2856d <thread_data_t::trampoline(thread_data_t
const*)+1>, arg=0x0) at bionic/libc/bionic/pthread.c:324
#9  0x00000000 in ?? ()
The program is running.  Quit anyway (and kill it)? (y or n)
--------------------------------------------------

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