What is the purpose of the RBP register in x86_64 assembler?
172 rbp is the frame pointer on x86_64. In your generated code, it gets a snapshot of the stack pointer (rsp) so that when adjustments are made to rsp (i.e. reserving space for local variables or push ing …
Why are RBP and RSP called general-purpose registers?
Apr 10, 2016 · In the article Understanding C by learning assembly, it's written that RBP and RSP are special-purpose registers (RBP points to the base of the current stack frame and RSP points to the …
Why RBP instead of another register as a frame pointer?
Mar 28, 2021 · 4 I understand the usage of push rbp... pop rbp at the start and end of a function to preserve the rbp value of the calling function, since the rbp register is callee-preserved. And then I …
assembly - Are there different ways to set RBP? Why does Windows …
Mar 13, 2023 · Putting RBP closer to the middle of space you might want to access increases the amount of space you can reach with [rbp + disp8], which uses a sign-extended 8-bit displacement in …
x86 - What do these assembly lines mean? - Stack Overflow
May 1, 2021 · I am struggling on a homework because I do not understand what these lines are supposed to mean ? mov rax, qword ptr [rbp - 0x28] mov rax, qword ptr [rax] mov eax, dword ptr …
What does the R stand for in RAX, RBX, RCX, RDX, RSI, RDI, RBP, RSP?
The x86 assembler language has had to change as the x86 processor architecture has changed from 8bit to 16bit to 32bit and now 64bit. I know that in 32bit assembler register names (EAX, EBX, etc.)...
assembly - Is RBP/EBP register really necessary to support Variable ...
Jun 2, 2016 · CSAPP 3rd edition said: To manage a variable-size stack frame, x86-64 code uses register %rbp to server as a frame pointer. However, I'm curious whether this %rbp register is really …
assembly - "mov rbp, rsp" in function prologue - Stack Overflow
May 8, 2021 · 1 push rbp mov rbp, rsp mov DWORD PTR [rbp-0x4],edi In assembly function prologue, isn't push rbp already moves its value to rsp ? Why did mov rbp, rsp instruction move the same rsp …
How to understand "cmpl $0x0, -0x30 (%rbp)" / "je ..."
Oct 8, 2017 · Rest of what -x(%rbp) means in various instructions (pay attention to the lea vs <any other instruction> semantics difference of "memory operand" usage, the lea does only the memory …
What is the "-4" for in assembler: movl $1, -4(%rbp)
Sep 29, 2020 · 2 -4 / -8 / -12 bytes relative to the address held in rbp, which is the pointer to the top of the stack (which grows downward). 4 bytes / 32 bits because that is the size of int on your machine.