CODEWITHSUNDEEP
assemblygccx86gdbstack-pointer
Aaa Bbb
Aaa Bbb

Reputation: 667

Why is value of RSP higher than RBP as displayed in GDB?

I am inspecting a process (which has no bugs actually) with gdb.

However I noticed, when doing info registers, that RSP is higher than RBP, which is not consistent with the fact that the stack grows downwards. Is this perhaps some optimization by the compiler?

rbp            0x7fabaf9ba290      0x7fabaf9ba290
rsp            0x7ffdf1ffa1b0      0x7ffdf1ffa1b0

Upvotes: 1

Views: 423

Answers (1)

Joseph Sible-Reinstate Monica
Joseph Sible-Reinstate Monica

Reputation: 48672

There's no requirement that rbp be used as a frame pointer. When -fomit-frame-pointer is active, as is the default in optimized programs, it's just used the same as any other call-saved register (e.g., rbx).

Upvotes: 3

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