memory - Assembly - How to see the value in a particular variable with gdb -

here assembly code

section .data  msg: db "hello"  section .text global _start _start: nop mov rax,23 nop 

can access data located in 'msg' gdb

the command x/5cb &msg should dump 5 bytes @ correct address, in both decimal , character notation.

alternatively, should able use printf "%5.5s\n", &msg well, substituting in whatever format string need other data (a null terminated string, example, need "%s").

this tested under cygwin following program:

section .data  msg:    db    "hello"  section .text global _start  _start: mov   eax, 42         ret 

when compile , run that, expected 42 return code:

pax> nasm -f elf -o prog.o prog.asm pax> ld -o prog.exe prog.o pax> ./prog.exe ; echo $? 42 

starting in debugger, can see commands needed @ msg:

pax> gdb prog.exe gnu gdb (gdb) 7.8 copyright (c) 2014 free software foundation, inc. <blah blah blah> reading symbols prog.exe...(no debugging symbols found)...done.  (gdb) b start breakpoint 1 @ 0x401000  (gdb) r starting program: /cygdrive/c/pax/prog.exe [new thread 7416.0x20c0] breakpoint 1, 0x00401000 in start ()  (gdb) x/5cb &msg 0x402000 <msg>: 104 'h' 101 'e' 108 'l' 108 'l' 111 'o'  (gdb) printf "%5.5s\n", &msg hello