10.13 Registers

info registers

info all-registers

GDB has four “standard” register names that are available (in expressions) on most machines—whenever they do not conflict with an architecture’s canonical mnemonics(助记符) for registers.

Register name	Register	Reference
$pc	program counter register	wikipedia Program counter
$sp	stack pointer	wikipedia Stack register
$fp	register that contains a pointer to the current stack frame
$ps	register that contains the processor status

NOTE:register的理论知识，重要在工程Hardware中进行的讨论。

For example, you could print the program counter in hex with

p/x $pc

or print the instruction to be executed next with

x/i $pc

or add four to the stack pointer12 with

set $sp += 4