Lab

Lab 1 - GDB

General

gdb: start gdb file [file] load a file r [arg] [arg]: run with argument kill: kill current program

Navigation

b [arg]: set a break point

• function name

• line number

• sourceFile:lineNumber

n: next s: step finish: step out stepi: step single assembly c: continue to next breakpoint advance [function]: continue to this temporary breakpoint jump [i]: jump to breakpoint

Breakpoint Setting

i b: info of all break points disable [num]: disable specific break point delete [num]: delete break point clear [nmae]: delete break point by name of function save breakpoints <filename>: save break point source <filename>: load break point

Variable Manipulation

disp [name]: display content of variable by name info display: show display by number undisplay [num]: undisplay by number print [name]: print by variable name printf "%08X\n", i: printf backtrace: show stack set (i = 20): set variable i to 20 watch [name]: watch change of variable (write) by expression rwatch: detect variable read awatch: detect variable read + write info watch: see all watch point call [expr]: call expression

Byte Code

x/nfu

• n: units of memory

• f(format): either d(decimal), x(hex), s(string)

• u(unit): either b(bytes), w(4 bytes), g(giant64)

x/i $pc: see current line (https://sourceware.org/gdb/current/onlinedocs/gdb/Registers.html)

TODO: valgrind arguments