Are there 64-bit registers?
Registers. x64 extends x86’s 8 general-purpose registers to be 64-bit, and adds 8 new 64-bit registers. The 64-bit registers have names beginning with “r”, so for example the 64-bit extension of eax is called rax. The new registers are named r8 through r15.
What does Pushq %RBP mean?
LC0 in memory, to register $eax pushq %rbp — push the quad-word data in register %rbp onto the stack movq %rsp, %rbp — move (copy) the quad-word from register %rsp to register %rbp jmp . But it means: take the address in memory referred to by register %rbp (and so %rbp is being used as a pointer here).
What is the RSP register?
The first lines of the function main refers to rbp and rsp ; these are special purpose registers. rbp is the base pointer, which points to the base of the current stack frame, and rsp is the stack pointer, which points to the top of the current stack frame.
What does (% RBP mean?
mov %rdi, -8(%rbp) The mov instruction moves the 1st argument (passed in %rdi) to its place on the stack. The argument occupies the first stack position (stack entries are 8 bytes) after the base pointer (%rbp). 0(%rbp) stores the previous frame’s base pointer.
Is AMD x86-64?
AMD64 is a 64-bit processor architecture that was developed by Advanced Micro Devices (AMD) to add 64-bit computing capabilities to the x86 architecture. It is sometimes referred to as x86-64, x64, and Intel 64.
What is RBP x64?
rbp is the frame pointer on x86_64.
What is x64 assembly language?
x64 is a generic name for the 64-bit extensions to Intel‟s and AMD‟s 32-bit x86 instruction set architecture (ISA). AMD introduced the first version of x64, initially called x86-64 and later renamed AMD64. Intel named their implementation IA-32e and then EMT64.
What is sub RSP?
It’s a very common way for you or the compiler to allocate a few bytes of temporary space in a function, like for local variables. So to claim 8 bytes of stack space, you just “sub rsp,8”. You can then write data to your new space with “mov QWORD[rsp],”, and read it back at any later point in your function.
What is x86 RDX?
rdx – register d extended. rbp – register base pointer (start of stack) rsp – register stack pointer (current location in stack, growing downwards) rsi – register source index (source for data copies) rdi – register destination index (destination for data copies)
What is 0x4 (% RBP?
Here, %rbp is called the base register, and -0x4 is the displacement.
What is RBP GDB?
Registers in gdb can be referred with the prefix ‘$’ p *(int *)($rbp – 8) RBP and RSP most likely refer to memory locations, specifically to stack. Other registers are more or less generic purpose registers and can point to memory too.