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What is the difference between mov (%rax),%eax and mov %rax,%eax? 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 64-bit operating system
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
Assembly registers in 64-bit architecture - Stack Overflow Following the answer about assembly registers' sizes: First, what sizes are eax, ax, ah and their counterparts, in the 64-bit architecture? How to access a single register's byte and how to access
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
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)
assembly - Intel 64, rsi and rdi registers - Stack Overflow In Intel x86 64 bit architecture there is the rax rdx registers which are simply A D general purpose registers But there are also registers called rsi and rdi which are the "source index" and "destination index" registers respectively Why do these registers have actual names (compared to just A, etc)? What does "source index" and "destination index" actually mean? And is there some
assembly - The point of test %eax %eax - Stack Overflow Possible Duplicate: x86 Assembly - ‘testl’ eax against eax? I'm very very new to assembly language programming, and I'm currently trying to read the assembly language generated from a binary
assembly - What does callq * (%rax) mean? - Stack Overflow Thus (%rax) means to get the value of the pointer currently stored in %rax What does the star decoration do on that? Does that further dereference that value (thus (%rax) is itself a pointer)? I'm having trouble googling * ( assembly syntax This is x64 assembly generated from GCC 4 8 compiling C++ code