assembly
What’s the size of a QWORD on a 64-bit machine?
In x86 terminology/documentation, a “word” is 16 bits because x86 evolved out of 16-bit 8086. Changing the meaning of the term as extensions were added would have just been confusing, because Intel still had to document 16-bit mode and everything, and instruction mnemonics like cwd (sign-extend word to dword) bake the terminology into the ISA. … Read more
What is the difference between =label (equals sign) and [label] (brackets) in ARMv6 assembly?
ldr r0,=something … something: means load the address of the label something into the register r0. The assembler then adds a word somewhere in reach of the ldr instruction and replaces it with a ldr r0,[pc,#offset] instruction So this shortcut ldr r0,=0x12345678 means load 0x12345678 into r0. being mostly fixed length instructions, you cant load … Read more