Home » Language IDEs » C / C++ IDE (CDT) » Problem cross-debugging multithreaded MIPS program
| Problem cross-debugging multithreaded MIPS program [message #126690] |
Wed, 10 November 2004 13:34 |
 Yoni Rabinovitch
Messages: 3
Registered: July 2009 |
Junior Member |
|
|
Hi,
I am trying to cross-debug a multithreaded program running on an embedded
MIPS 5Kc using Eclipse GDB/MI (running on a Red Hat 9.0 PC) and gdbserver.
My environment is as follows:
Eclipse: 3.0.1
CDT: 2.0.2
gdb : 6.2.1, configured for cross-debug of mips target
Now, regular (command line) gdb works OK in my environment, with one small
problem. When I try
to examine the stack (e.g. "backtrace"), I get something like the
following:
(gdb) bt
#0 0x2ad00b84 in nanosleep () from /pub/mips-gnu/lib/libc.so.6
#1 0x2ab4e638 in nanosleep () from /pub/mips-gnu/lib/libpthread.so.0
Cannot access memory at address 0x2c
This is OK (I guess), apart from the "Cannot access memory at address
0x2c".
I have been told that GDB sometimes gets confused by glibc's syscall
stubs, and that I don't need to worry about errors at the end of
backtraces.
HOWEVER, it seems that this error causes the GDB/MI -stack-info-depth
command to fail, as can
be seen from the following trace (from Eclipse):
[1,100,086,148,682] (gdb)
[1,100,086,148,683] 440-stack-info-depth
[1,100,086,148,990] &"Cannot access memory at address 0x2c\n"
[1,100,086,148,990] 440^error,msg="Cannot access memory at address 0x2c"
[1,100,086,148,991] (gdb)
This in turn prevents the Eclipse CDT debug session from working properly.
After -stack-info-depth fails, no -stack-list-frames gets issued, and the
Eclipse debug session more or less hangs (e.g. impossible to single-step).
So, my question is, is there any way I can work around this problem ?
I have attached below more detailed traces of gdb "backtrace" and gdb/mi
"-stack-info-depth" after enabling the gdb debug frame flag.
Thanks in advance for any help !!
Yoni
Output from regular gdb "backtrace" command, after "set debug frame 1"
============================================================ ==========
(gdb) set debug frame 1
(gdb) bt
#0 0x2ad00b84 in nanosleep () from /pub/mips-gnu/lib/libc.so.6
{ get_prev_frame_1 (this_frame=0) ->
{level=1,type=NORMAL_FRAME,unwind=0x81e46f4,pc=0x2ab4e638,id ={stack=0x30,code=0x2ab4e5d8,!special},func=0x2ab4e5d8}
// cached
#1 0x2ab4e638 in nanosleep () from /pub/mips-gnu/lib/libpthread.so.0
{ get_prev_frame_1 (this_frame=1) ->
{level=2,type=UNKNOWN_FRAME,unwind=<unknown>,pc=<unknown>,id= <unknown>,func=<unknown>}
// cached
{ frame_register_unwind (frame=1,regnum=127(pc),...) Cannot access memory
at address 0x2c
(gdb)
Trace of Eclipse GDB/MI -stack-info-depth command, after "set debug frame
1"
============================================================ ================
[1,100,086,402,555] 444 set debug frame 1
[1,100,086,402,559] &"set debug frame 1\n"
[1,100,086,402,560] 444^done
[1,100,086,402,560] (gdb)
[1,100,086,405,243] 445-thread-select 4
[1,100,086,405,251] &"{ flush_cached_frames () }\n"
[1,100,086,405,373] &"{ create_sentinel_frame (...) ->
{level=-1,type=<unknown type>,unwind=0x822dd9\
4,pc=<unknown>,id={!stack,!code,!special},func=<unknown>} }\n"
[1,100,086,405,374] &"{ get_prev_frame_1 (this_frame=-1) ->
{level=0,type=UNKNOWN_FRAME,unwind=<unkn\
own>,pc=<unknown>,id=<unknown>,func=<unknown>} }\n"
[1,100,086,405,375] &"{ frame_register_unwind
(frame=-1,regnum=127(pc),...) -> *optimizedp=0 *lvalp=\
2 *addrp=0x1fc *bufferp=[2ad00b84] }\n"
[1,100,086,405,376] &"{ frame_pc_unwind (this_frame=-1) -> 0x2ad00b84 }\n"
[1,100,086,405,376]
445^done,new-thread-id="4",frame={level="0",addr="0x2ad00b84 ",func="nanosleep",a\
rgs=[],from="/pub/mips-gnu/lib/libc.so.6"}
[1,100,086,405,377] (gdb)
[1,100,086,405,379] 446-stack-info-depth
[1,100,086,405,390] &"{ get_prev_frame_1 (this_frame=0) { get_frame_id
(fi=0) {
frame_register_unwin\
d (frame=-1,regnum=90(zero),...) -> *optimizedp=0 *lvalp=2 *addrp=0x168
*bufferp=[00000000] }\n"
[1,100,086,405,434] &"{ frame_func_unwind (fi=-1) -> 0x2ad00b70 }\n"
[1,100,086,405,435] &"-> {stack=0x0,code=0x2ad00b70,!special} }\n"
[1,100,086,405,435] &"{ frame_id_p
(l={stack=0x0,code=0x2ad00b70,!special}) -> 1 }\n"
[1,100,086,405,436] &"->
{level=1,type=UNKNOWN_FRAME,unwind=<unknown>,pc=<unknown>,id= <unknown>,func\
=<unknown>} }\n"
[1,100,086,405,437] &"{ frame_register_unwind (frame=0,regnum=127(pc),...)
{ frame_register_unwind (\
frame=-1,regnum=121(ra),...) -> *optimizedp=0 *lvalp=2 *addrp=0x1e4
*bufferp=[2ab4aff8] }\n"
[1,100,086,405,438] &"-> *optimizedp=0 *lvalp=2 *addrp=0x1e4
*bufferp=[2ab4aff8] }\n"
[1,100,086,405,438] &"{ frame_pc_unwind (this_frame=0) -> 0x2ab4aff8 }\n"
[1,100,086,405,439] &"{ get_prev_frame_1 (this_frame=1) { get_frame_id
(fi=1) {
frame_register_unwin\
d (frame=0,regnum=119(sp),...) -> *optimizedp=0 *lvalp=0 *addrp=0x0
*bufferp=[00000000] }\n"
[1,100,086,405,512] &"{ frame_func_unwind (fi=0) -> 0x2ab4adec }\n"
[1,100,086,405,512] &"-> {stack=0x278,code=0x2ab4adec,!special} }\n"
[1,100,086,405,513] &"{ frame_id_p
(l={stack=0x278,code=0x2ab4adec,!special}) -> 1 }\n"
[1,100,086,405,514] &"{ frame_id_inner
(l={stack=0x278,code=0x2ab4adec,!special},r={stack=0x0,code= 0\
x2ad00b70,!special}) -> 0 }\n"
[1,100,086,405,514] &"{ frame_id_eq
(l={stack=0x278,code=0x2ab4adec,!special},r={stack=0x0,code= 0x2a\
d00b70,!special}) -> 0 }\n"
[1,100,086,405,515] &"->
{level=2,type=UNKNOWN_FRAME,unwind=<unknown>,pc=<unknown>,id= <unknown>,func\
=<unknown>} }\n"
[1,100,086,405,813] &"{ frame_register_unwind (frame=1,regnum=127(pc),...)
Cannot access memory at a\
ddress 0x240\n"
[1,100,086,405,813] 446^error,msg="Cannot access memory at address 0x240"
[1,100,086,405,814] (gdb)
[1,100,086,405,817] 446-stack-info-depth
[1,100,086,405,874] &"{ get_prev_frame_1 (this_frame=0) ->
{level=1,type=NORMAL_FRAME,unwind=0x81e46\
f4,pc=0x2ab4aff8,id={stack=0x278,code=0x2ab4adec,!special},f unc=0x2ab4adec}
// cached \n"
[1,100,086,405,875] &"{ get_prev_frame_1 (this_frame=1) ->
{level=2,type=UNKNOWN_FRAME,unwind=<unkno\
wn>,pc=<unknown>,id=<unknown>,func=<unknown>} // cached \n"
[1,100,086,405,890] &"{ frame_register_unwind (frame=1,regnum=127(pc),...)
Cannot access memory at a\
ddress 0x240\n"
[1,100,086,405,891] 446^error,msg="Cannot access memory at address 0x240"
[1,100,086,405,891] (gdb)
|
|
|
Goto Forum:
Current Time: Sat Nov 09 03:04:06 GMT 2024
Powered by FUDForum. Page generated in 0.02480 seconds |
] 
Search
Help
Register
Login
Home
