Break points with latest SIS

[Sebastian Huber]

Hello,

I get a NULL pointer exception in one of the tests:

sparc-rtems5-sis -leon3 -nouartrx -r -tlim 200 s -m 4 
smpswitchextension01.exe

  SIS - SPARC/RISCV instruction simulator 2.11,  copyright Jiri Gaisler 1995
  Bug-reports to jiri at gaisler.se

  LEON3 emulation enabled, 4 cpus online, delta 50 clocks

Waking CPU 1


*** BEGIN OF TEST SMPSWITCHEXTENSION 1 ***
*** TEST VERSION: 5.0.0.e105ead93f8e7addf1c6bba731a1eb4da99f2e85
*** TEST STATE: EXPECTED-PASS
*** TEST BUILD: RTEMS_DEBUG RTEMS_NETWORKING RTEMS_POSIX_API RTEMS_SMP
*** TEST TOOLS: 7.4.0 20181206 (RTEMS 5, RSB 
c41b9d0df7e5b4a5056ca50c2534380a44e92769, Newlib 3e24fbf6f)
Unexpected trap ( 2) at address 0x00000000
illegal instruction
IU in error mode (0)
  11360600  4001d9e0  12bffffe  bne  0x000000004001d9d8

I tried to debug this issue:

sparc-rtems5-gdb smpswitchextension01.exe
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This GDB was configured as "--host=x86_64-linux-gnu --target=sparc-rtems5".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
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For help, type "help".
Type "apropos word" to search for commands related to "word"...
No symbol table is loaded.  Use the "file" command.
Reading symbols from smpswitchextension01.exe...done.
(gdb) tar sim -leon3 -m 4
Connected to the simulator.
(gdb) load
(gdb) b *0
Breakpoint 1 at 0x0
(gdb) r
Starting program: 
/build/git-build/b-leon3/sparc-rtems5/c/leon3/testsuites/smptests/smpswitchextension01.exe 

Waking CPU 1


*** BEGIN OF TEST SMPSWITCHEXTENSION 1 ***
*** TEST VERSION: 5.0.0.e105ead93f8e7addf1c6bba731a1eb4da99f2e85
*** TEST STATE: EXPECTED-PASS
*** TEST BUILD: RTEMS_DEBUG RTEMS_NETWORKING RTEMS_POSIX_API RTEMS_SMP
*** TEST TOOLS: 7.4.0 20181206 (RTEMS 5, RSB 
c41b9d0df7e5b4a5056ca50c2534380a44e92769, Newlib 3e24fbf6f)

Program received signal SIGTRAP, Trace/breakpoint trap.
0x40007070 in _API_Mutex_Is_owner (the_mutex=0x40026598 
<_RTEMS_Allocator_Mutex>) at 
/home/EB/sebastian_h/git-rtems-5/c/src/../../cpukit/score/src/apimutexisowner.c:25
25        return the_mutex->Mutex._Mutex._Queue._owner == 
_Thread_Get_executing();
(gdb) disas
Dump of assembler code for function _API_Mutex_Is_owner:
    0x4000706c <+0>:     ld  [ %o0 + 0xc ], %g1
=> 0x40007070 <+4>:     ld  [ %g6 + 0x20 ], %g2
    0x40007074 <+8>:     xor  %g1, %g2, %g1
    0x40007078 <+12>:    cmp  %g0, %g1
    0x4000707c <+16>:    retl
    0x40007080 <+20>:    subx  %g0, -1, %o0
End of assembler dump.
(gdb) info registers
g0             0x0                 0
g1             0x40027688          1073903240
g2             0x40029b54          1073912660
g3             0x8e                142
g4             0x40029b54          1073912660
g5             0x0                 0
g6             0x40029640          1073911360
g7             0x0                 0
o0             0x40026598          1073898904
o1             0x4002f300          1073935104
o2             0x0                 0
o3             0x40023800          1073887232
o4             0x0                 0
o5             0x40029640          1073911360
sp             0x4002f2a8          0x4002f2a8
o7             0x40008444          1073775684
l0             0xf3400fc7          -213905465
l1             0x4001add8          1073851864
l2             0x4001addc          1073851868
l3             0xf34000c7          -213909305
l4             0x0                 0
l5             0x0                 0
l6             0x0                 0
l7             0x0                 0
i0             0x400263b4          1073898420
i1             0x400269cc          1073899980
i2             0x0                 0
i3             0x40029c00          1073912832
i4             0x40029b50          1073912656
i5             0x40029b50          1073912656
fp             0x4002f308          0x4002f308
i7             0x4001170c          1073813260
y              0x588               1416
psr            0xf34000e7          [ ET PS S ]
wim            0x8                 8
tbr            0x400008a0          1073744032
pc             0x40007070          0x40007070 <_API_Mutex_Is_owner+4>
npc            0x40007074          0x40007074 <_API_Mutex_Is_owner+8>
fsr            0x0                 [ ]
csr            0x0                 0

It seems the debugger doesn't stop at address 0, but somewhere else.

-- 
Sebastian Huber, embedded brains GmbH

Address : Dornierstr. 4, D-82178 Puchheim, Germany
Phone   : +49 89 189 47 41-16
Fax     : +49 89 189 47 41-09
E-Mail  : sebastian.huber at embedded-brains.de
PGP     : Public key available on request.

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