Hello Sebastian,
here is a patch for RSB that improves sis debugging in gdb and on SMP systems:
* Correct break-point handling in gdb
* Detect and break on NULL pointer derefence (call/jump)
* Single stepping (stepi) in gdb/sis keeps focus on debugged cpu
* 'sim cpu' command shows active cpu in gdb, 'sim cpu x' switches gdb focus to
cpu x (needs stepi afterwards)
* Trace buffer works in gdb
I still have more fixes in the pipeline (symbol handling, tab expansion,
documentation) but I thought I provide a patch of what I have now to help you
in your debugging. I will also be away skiing next week so there will not be
much progress in near term.
Below is a debug session of your failing SMP program as an example:
$ ~/src/gdb/sparc/gdb/gdb
./sparc-rtems5/c/leon3/testsuites/smptests/smpswitchextension01.exe
Reading symbols from
./sparc-rtems5/c/leon3/testsuites/smptests/smpswitchextension01.exe...
(gdb) tar sim -leon3 -m 4
Connected to the simulator.
(gdb) load
(gdb) sim hi 5
trace history length = 5
(gdb) run
Starting program:
/home/jiri/src/rtems/leon3mp2/sparc-rtems5/c/leon3/testsuites/smptests/smpswitchextension01.exe
Waking CPU 1
*** BEGIN OF TEST SMPSWITCHEXTENSION 1 ***
*** TEST VERSION: 5.0.0.03fcbb15d24e2eec41bac9f5dee30bbf7dc888b8-modified
*** 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 SIGSEGV, Segmentation fault.
0x4000a2e4 in _User_extensions_Thread_switch (heir=0x4
0027aa8 <_RTEMS_tasks_Objects+3936>, executing
=<optimized out>) at /home/jiri/ibm/src/rtems/rtems/cpukit
/include/rtems/score/userextimpl.h:280
280 (*extension->thread_switch)( executing, heir );
(gdb) list
275
276 while ( node != tail ) {
277 const User_extensions_Switch_control *extension =
278 (const User_extensions_Switch_control *) node;
279
280 (*extension->thread_switch)( executing, heir );
281
282 node = _Chain_Immutable_next( node );
283 }
284
(gdb) sim cpu
active cpu: 1
(gdb) sim hi
243329 4000a2f0 80a74016 cmp %i5, %l6
243331 4000a2f4 32bffffb bne,a 0x000000004000a2e0
243332 4000a2f8 c2076008 ld [ %i5 + 8 ], %g1
243334 4000a2e0 9210001c mov %i4, %o1
243335 4000a2e4 9fc04000 call %g1
(gdb) sim reg
INS LOCALS OUTS GLOBALS
0: 40029740 F3000FC7 40027FC8 00000000
1: F34000E6 40029850 40027AA8 00000000
2: F30000E6 40006F04 40028238 00000013
3: 40029740 40027FC8 0000000B 40029854
4: 40027AA8 4002985C 80000000 80000000
5: 00000000 40029858 40029010 00000000
6: 40031240 400264B8 400311A8 40029740
7: 40006FC8 40026400 4000A2E4 00000000
psr: F3900FE7 wim: 00000004 tbr: 40000890 y: 00000A6A
pc: 4000A2E4 = 9FC04000 call %g1
npc: 4000A2E8 = 90100013 mov %l3, %o0
IU in error mode
Run again
(gdb) load
(gdb) bre switcher
Breakpoint 1 at 0x40001794: file
/home/jiri/ibm/src/rtems/rtems/c/src/../../testsuites/smptests/smpswitchextension01/init.c,
line 109.
(gdb) run
Starting program:
/home/jiri/src/rtems/leon3mp2/sparc-rtems5/c/leon3/testsuites/smptests/smpswitchextension01.exe
Waking CPU 1
*** BEGIN OF TEST SMPSWITCHEXTENSION 1 ***
*** TEST VERSION: 5.0.0.03fcbb15d24e2eec41bac9f5dee30bbf7dc888b8-modified
*** 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)
Breakpoint 1, switcher (self=0) at /home/jiri/ibm/src/rtems/rt
ems/c/src/../../testsuites/smptests/smpswitchextension01/init.c:109
109 {
(gdb) sim cpu
active cpu: 0
(gdb) sim hi
180980 40001794 9de3bfa0 save %sp, -96, %sp
180972 4000bb18 9de3bfa0 save %sp, -96, %sp
180973 4000bb1c c206216c ld [ %i0 + 0x16c ], %g1
180975 4000bb20 9fc04000 call %g1
180978 4000bb24 d0062170 ld [ %i0 + 0x170 ], %o0
(gdb) sim cpu 1
active cpu: 1
(gdb) sim hi
180992 400139fc 9207bff8 add %fp, -8, %o1
180993 40013a00 40001c79 call 0x000000004001abe4
180994 40013a04 9010001b mov %i3, %o0
180995 4001abe4 d0226004 st %o0, [ %o1 + 4 ]
180998 4001abe8 c2020000 ld [ %o0 ], %g1
(gdb) stepi
0x4001abf0 274 return atomic_fetch_add_explicit( obj, arg, order );
(gdb)
diff --git a/rtems/config/tools/rtems-gdb-8.2.1-1.cfg b/rtems/config/tools/rtems-gdb-8.2.1-1.cfg
index 974577e..b12f43d 100644
--- a/rtems/config/tools/rtems-gdb-8.2.1-1.cfg
+++ b/rtems/config/tools/rtems-gdb-8.2.1-1.cfg
@@ -15,4 +15,7 @@
%patch add gdb https://devel.rtems.org/raw-attachment/ticket/3460/gdb-8.2.1-riscv-config.patch
%hash sha512 gdb-8.2.1-riscv-config.patch 193eb9ddfc79c494eb8b1e971cc230f5f01b1653ba3f85b8541b973dfcd23ead65dea7a638a6ccdb7f6fc0201f9a764bfdf3f89b2d9afba5c13a5ca97e52ce9d
+%patch add gdb https://gaisler.se/gdb/gdb-8.2.1-sis-2.12.patch
+%hash sha512 gdb-8.2.1-sis-2.12.patch ee321be58c4788580eb16f2e9c7329fddd6d9c22922f22f93a33aaa7ff97804cdf3539de835756109b99b4c975ec68880d438debebe22923c303b565fe2188da
+
%include %{_configdir}/gdb-8-1.cfg
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