Starting with GDB 8.1, there’s a special command for this: starti. Example GDB session: $ gdb /bin/true Reading symbols from /bin/true…(no debugging symbols found)…done. (gdb) starti Starting program: /bin/true Program stopped. 0xf7fdd800 in _start () from /lib/ld-linux.so.2 (gdb) x/5i $pc => 0xf7fdd800 <_start>: mov eax,esp 0xf7fdd802 <_start+2>: call 0xf7fe2160 <_dl_start> 0xf7fdd807 <_dl_start_user>: mov edi,eax 0xf7fdd809 … Read more
Specify the full path: gdb> break /Full/path/to/service.cpp:45
You can view the contents of the stack with x/10x $sp This will print the top 10 elements of the stack.
Read section 5.1.6 of the GDB manual. What you have to do is first set a breakpoint, then set an ‘ignore count’ for that breakpoint number, e.g. ignore 23 1000. If you don’t know how many times to ignore the breakpoint, and don’t want to count manually, the following may help: ignore 23 1000000 # … Read more
gdb ./vuln_prog run < filename_with_input
Issue the ‘generate-core-file’ command in gdb. (gdb) help generate-core-file Save a core file with the current state of the debugged process. Argument is optional filename. Default filename is ‘core.<process_id>’. (gdb) break main Breakpoint 1 at 0x400e0b: file utils/udec.c, line 36. (gdb) r Starting program: /home/nos/build/utils/udec Breakpoint 1, main (argc=1, argv=0x7fffffffe9a8) at utils/udec.c:36 36 int fileargc … Read more
gdb -ex run ./a.out If you need to pass arguments to a.out: gdb -ex run –args ./a.out arg1 arg2 … EDIT: Orion says this doesn’t work on Mac OSX. The -ex flag has been available since GDB-6.4 (released in 2005), but OSX uses Apple’s fork of GDB, and the latest XCode for Leopard contains GDB … Read more
It means you compiled with e.g. gcc -O3 and the gcc optimiser found that some of your variables were redundant in some way that allowed them to be optimised away. In this particular case you appear to have three variables a, b, c with the same value and presumably they can all be aliassed to … Read more
Sure it is. Try these: # Hexadecimal p/x variable # Binary p/t variable See output formats.
It’s called the TUI (no kidding). Start for example with gdbtui or gdb -tui … Please also see this answer by Ciro Santilli. It wasn’t available in 2012 to the best of my knowledge, but definitely worth a look.