Running
| command
|
abbreviation
|
action
|
| step
|
s
|
step to next source line, possibly into functions
|
| next
|
n
|
step over any functions to next source line
|
| finish
|
fin
|
step out of the current stack frame/function
|
| stepi
|
|
step to next instruction, stepping into subroutine calls
|
| nexti
|
|
step to next instruction, stepping over subroutine calls
|
Examining state
| command
|
abbreviation
|
action
|
| info registers
|
i r
|
Dump out common registers
|
| info line 0x888
|
i li
|
Show source around the line, file:line or address
|
| x/20i 0x888
|
|
Disassemble instructions at the given address
|
Breakpoints
| command
|
abbreviation
|
action
|
| info breakpoints
|
i b
|
display breakpoints
|
| delete <n>
|
d <n>
|
delete breakpoint numbered <n>
|
| breakpoint <n>
|
b <n>
|
breakpoint at <n>, which may be a symbol, line number or address
|
Dumping output to a file
(gdb) set pagination off
(gdb) set logging file /tmp/ls.malloc.log
(gdb) set logging overwrite
(gdb) set logging redirect on
(gdb) set logging on
Redirecting output to /tmp/ls.malloc.log.
Examples
Dump stack on function call
Dump thread stack each and every time a specific function is called, writing to a log.
ksh$ gdb /bin/ls
GNU gdb (GDB) 7.7.1
...
(gdb) b malloc
Breakpoint 1 at 0x401360
(gdb) commands
Type commands for breakpoint(s) 1, one per line.
End with a line saying just "end".
>bt
>c
>end
(gdb) set pagination off
(gdb) set logging file /tmp/ls.malloc.log
(gdb) set logging overwrite
(gdb) set logging redirect on
(gdb) set logging on
Redirecting output to /tmp/ls.malloc.log.
(gdb) run
...
(gdb) quit
ksh$ head -10 /tmp/ls.malloc.log
Starting program: /bin/ls
Breakpoint 1, 0x00007f7ff70b2b4a in malloc () from /lib/libc.so.12
#0 0x00007f7ff70b2b4a in malloc () from /lib/libc.so.12
#1 0x00007f7ff70f4871 in __setlocale () from /lib/libc.so.12
#2 0x00000000004023fa in ls_main ()
#3 0x0000000000401715 in ___start ()
#4 0x00007f7ff7ffa000 in ?? ()
#5 0x0000000000000001 in ?? ()
#6 0x00007f7ffffffca0 in ?? ()
#7 0x0000000000000000 in ?? ()
See Also
External
