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x86 64 - Why is the %rax register used in the assembly for this . . . @RossRidge given %rax is the go-to register for storing return values, seeing it used in another way is surprising to me It means that reading the disassembled code requires us to mentally map %rax not to the return value, but to just another scratch reg
What is the difference between mov (%rax),%eax and mov %rax,%eax? In AT T syntax, the instruction: mov (%rax), %eax # AT T syntax or, equivalently in Intel syntax: mov eax, DWORD PTR [rax] ; Intel syntax dereferences the memory address stored in rax, reads a 32-bit value from that memory address, and stores it in the eax register Because the memory address being dereferenced is stored in rax, it can be a 64-bit address, which is necessary when running on a
assembly - How is rax different from eax? - Stack Overflow The registers starting with r as in rax, rbx, etc, are the 64-bit registers introduced with the AMD64 extension to the existing 32-bit x86 ISA That ISA extension was subsequently adopted by Intel and is often known by the more neutral name x86-64 Essentially all x86 chips released in the last decade from AMD and Intel support this ISA Registers like eax, ebx, etc are the 32-bit registers
What does the R stand for in RAX, RBX, RCX, RDX, RSI, RDI, RBP, RSP? • RDX:RAX register pair representing a 128-bit operand See the question and answer for x86_64 registers rax eax ax al overwriting full register contents as well as Why do most x64 instructions zero the upper part of a 32 bit register which provide some explanation about how the 64 bit register operation differ from the 32 bit register operation
x86 - What do these assembly lines mean? - Stack Overflow 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 [rax] mov dword ptr [rb
x86_64 registers rax eax ax al overwriting full register contents As it is widely advertised, modern x86_64 processors have 64-bit registers that can be used in backward-compatible fashion as 32-bit registers, 16-bit registers and even 8-bit registers, for exampl
assembly - How do AX, AH, AL map onto EAX? - Stack Overflow RAX is the full 64-bit value, with EAX and its sub-components mapped to the lower 32 bits The upper half of 64-bit registers is only accessible in 64-bit mode, unlike 32-bit registers which can be used in any mode on CPUs that support them
What are the names of the new X86_64 processors registers? The old 32-bit registers have been extended to 64 bits, the r registers (rax, rbx, rsp and so on) In addition, there's some extra general purpose registers r8 through r15 which can also be accessed as (for example) r8d, r8w and r8b (the lower 32-bit double-word, 16-bit word and 8-bit byte respectively)