In the table below extracted from Intel's docs we have for the opcodes E8 cw and E8 cd that the displacement is relative to the next instruction. Why the next instruction? Why isn't the displaceme...

I have tried to compile c code to assembly code using gcc -S -fasm foo.c. The c code declare global variable and variable in the main function as shown below: int y=6; int main() { int x=4; x=x+...

Consider the following variable reference in x64 Intel assembly, where the variable a is declared in the .data section: mov eax, dword ptr [rip + _a] I have trouble understanding how this variab...

Does rax get offset plus the address of this instruction, or the next? From a microcode point of view it might be easier if the answer was the next instruction.

Concerning the following small code, which was illustrated in another post about the size of structure and all the possibilities to align data correctly : struct { char Data1; short Data2; int ...

I have written a small piece of assembly with AT&T syntax and have currently declared three variables in the .data section. However, when I attempt to move any of those variables to a register,...

According to the ARM IC. In ARM state, the value of the PC is the address of the current instruction plus 8 bytes. In Thumb state: For B, BL, CBNZ, and CBZ instructions, the value of the...

I found the following assembly code in disassembler (floating point logic c++). 842: movss 0x21a(%rip),%xmm0 I understand that when process rip will allways be 842 and this 0x21a(%rip) w...

I am following this tutorial about assembly. According to the tutorial (which I also tried locally, and got similar results), the following source code: int natural_generator() { int a = 1; st...

I was looking at the assembler output of my code and need help with below instructions. 0x00000fe8: e28fc000 .... ADR r12,{pc}+8 ; 0xff0 0x00000fec: e28cca08 .... ADD r12,r12,#8, 20 ; #0x8000 F...

How do I use RIP Relative Addressing in a Linux assembly program for the AMD64 archtitecture? I am looking for a simple example (a Hello world program) that uses the AMD64 RIP relative adressing mo...

Is there a way to have gcc generate %pc relative addresses of constants? Even when the string appears in the text segment, arm-elf-gcc will generate a constant pointer to the data, load the address...