Debugging Core Files Using HP WDB (5900-1573; WDB 6.2; January 2011)

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$ aCC -g example2.c -o example2

$ aCC -g example.c -o example

$ strip example

$ ./example

Abort(coredump)

$ gdb example core

HP gdb

...

Core was generated by `example'.

Program terminated with signal 6, Aborted.

warning: The shared libraries were not privately mapped; setting a

breakpoint in a shared library will not work until you rerun the program.

(no debugging symbols found)...(no debugging symbols found)...

(no debugging symbols found)...#0 0xc01082b8 in kill () from /usr/lib/libc.2

(gdb) bt

#0 0xc01082b8 in kill () from /usr/lib/libc.2

#1 0xc00a52e8 in raise () from /usr/lib/libc.2

#2 0xc00e5c8c in abort_C () from /usr/lib/libc.2

#3 0xc00e5ce4 in abort () from /usr/lib/libc.2

#4 0x2428 in function_abort () from /home/u492893/example/temp/./example

#5 0x23d8 in function_b () from /home/u492893/example/temp/./example

#6 0x23a8 in function_a () from /home/u492893/example/temp/./example

#7 0x2378 in main () from /home/u492893/example/temp/./example

(gdb) up

#1 0xc00a52e8 in raise () from /usr/lib/libc.2

(gdb)

#2 0xc00e5c8c in abort_C () from /usr/lib/libc.2

(gdb)

#3 0xc00e5ce4 in abort () from /usr/lib/libc.2

(gdb)

#4 0x2428 in function_abort () from /home/u492893/example/temp/./example

(gdb) x/x $sp

0x7f7e67b0:

0x00000001

The stack is traversed such that the stack pointer reflects the address of the required

function.

The symbol table from example2 is loaded for debugging the core file generated by

example, as follows:

(gdb) symbol example2

Reading symbols from example2...done.

(gdb) x/x $sp

0x7f7e68f0:

0x7f7d27c0

The stack pointer value in $sp is changed when the new symbol table is loaded. Hence,

you must keep track of the earlier values of $sp manually.

When a new symbol table is loaded, the values stored in the gdb convenience variables

are changed. Hence you cannot store the value of $sp in the gdb convenience variables.

After the new symbol table is loaded, you can use the gdb features which were not

previously available for the stripped executable.