How to get value stored in a register, using gdb? "p/x $ebx" fails with "No registers." -

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suppose following asm code

 8048deb:       e8 41 05 00 00          call   8049331 <explode_bomb>  8048df0:       03 73 f4                add    -0xc(%ebx),%esi  8048df3:       83 c3 04                add    $0x4,%ebx  8048df6:       8d 45 f8                lea    -0x8(%ebp),%eax  8048df9:       39 c3                   cmp    %eax,%ebx  8048dfb:       75 e7                   jne    8048de4 <phase_2+0x22>

i set breakpoint @ last line, time, expecting both %eax , %ebx have stored in them.

in gdb, do

p/x $ebx

and get:

no registers.

what error mean? how can current content stored in register?

p/x $ebx works fine me. (or rather, p/x $rbx, because i'm testing in 64-bit os, imagine p/x $ebx work in 32-bit.) application must running. if try p/x $rbx when application has not started or has exited, "no registers". sure breakpoint hit?


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