It’s AT&T assembly syntax: source comes before destination mnemonic suffixes indicate the size of the operands (q for quad, etc.) registers are prefixed with % and immediate values with $ effective addresses are in the form DISP(BASE, INDEX, SCALE) (DISP + BASE + INDEX * SCALE) Indirect jump/call operands indicated with * (as opposed to … Read more
movq (assuming you’re talking about x86) is a move of a quadword (64-bit value). This particular instruction: movq (%rsp), %rsp looks very much like code that will walk up through stack frames. This particular instruction grabs the quadword pointed to by the current stack pointer, and loads it into the stack pointer, overwriting it. By … Read more
Unless your 64-bit value can be encoded as a 32-bit-sign-extended immediate, you have to move it to a register first and then store. (Or do two separate 32-bit stores, or other worse workaround to get the bytes where you want them.) In NASM / Intel syntax, mov r64, 0x… picks a MOV encoding based on … Read more
Mnemonic cltq is the gas mnemonic for Intel’s cdqe as documented at: https://sourceware.org/binutils/docs/as/i386_002dMnemonics.html The mnemonics are: Convert Long To Quad (cltq): AT&T-style Convert Double to Quad Extend (cdqe): Intel Terminology: quad (aka quad-word) == 8 bytes long (AT&T) == double-word (Intel) == 4 bytes This is one of the few instructions whose GAS name is … Read more
Thats not Intel syntax, its AT&T syntax, also called GAS syntax. the $ prefix is for immediates (constants), and the % prefix is for registers (they are required1). For more about AT&T syntax, see also the [att] tag wiki. 1 Unless the noprefix option is specified, see here & here. But usually noprefix is only … Read more
It’s just call. Use Intel-syntax disassembly if you want to be able to look up instructions in the Intel/AMD manuals. (objdump -drwC -Mintel, GBD set disassembly-flavor intel, GCC -masm=intel) The q operand-size suffix does technically apply (it pushes a 64-bit return address and treats RIP as a 64-bit register), but there’s no way to override … Read more
AT&T syntax splits the movzx Intel instruction mnemonic into different mnemonics for different source sizes (movzb vs. movzw). In Intel syntax, it’s: movzx eax, byte ptr [eax+ecx+1] i.e. load a byte from memory at eax+ecx+1 and zero-extend to full register. BTW, most GNU tools now have a switch or a config option to prefer Intel … Read more
UNIX was for a long time developed on the PDP-11, a 16 bit computer from DEC, which had a fairly simple instruction set. Nearly every instruction has two operands, each of which can have one of the following eight addressing modes, here shown in the MACRO 16 assembly language: 0n Rn register 1n (Rn) deferred … Read more
NASM actually uses its own variation of Intel syntax, different from the MASM syntax used in Intel’s official documentation. The opcode names and operand orders are the same as in Intel so the instructions look the same at first glance, but any significant program will have differences. For example with MASM the instruction used by … Read more
In this case what you can do is : Go in developer options on the device Uncheck “USB Debugging” then check it again A confirmation box should then appear