att

来源： https://stackoverflow.com/questions/46629794/how-to-understand-cmpl-0x0-0x30rbp-je

来源： https://stackoverflow.com/questions/15288925/x86-cmpl-and-jne

来源： https://stackoverflow.com/questions/15288925/x86-cmpl-and-jne

来源： https://stackoverflow.com/questions/15288925/x86-cmpl-and-jne

来源： https://stackoverflow.com/questions/63333752/delay-when-running-asm-program-with-named-variables

来源： https://stackoverflow.com/questions/63333752/delay-when-running-asm-program-with-named-variables

问题 The Intel syntax has comments using the semicolon. When I switched to AT&T, it actually tried to interpret the comments. What is the comment syntax for AT&T assembly? 回答1: Comments for at&t assembler are: # this is a comment /* this is a comment */ According to the fourth result Google gave me // and /* */ comments are only supported in .S files because GCC runs the C preprocessor on them before assembling. For .s files, the actual assembler itself ( as ) only handles # as a comment character

问题 The Intel syntax has comments using the semicolon. When I switched to AT&T, it actually tried to interpret the comments. What is the comment syntax for AT&T assembly? 回答1: Comments for at&t assembler are: # this is a comment /* this is a comment */ According to the fourth result Google gave me // and /* */ comments are only supported in .S files because GCC runs the C preprocessor on them before assembling. For .s files, the actual assembler itself ( as ) only handles # as a comment character

问题 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. 回答1: The next. That's a general rule on x86 (see also branches). In Intel's manual volume 2 section 2.2.1.6 RIP-Relative Addressing: A new addressing form, RIP-relative (relative instruction-pointer) addressing, is implemented in 64-bit mode. An effective address is formed by adding displacement to the 64-bit RIP of the next

问题 Here is the code example that I have written using GAS syntax for 64 bit intel assembly. When the code is run the expectation is to print out the string: Inside the _print subroutine. #This example is a an example to call a subroutine .global _start .section .text _start: call _print _exit: #exit call mov $60, %rax xor %rdi, %rdi syscall _print: #set up the stack frame push %rbp mov %rsp, %rbp # write syscall's parameter set up mov std_out_fd, %rdi mov $message, %rsi movq message_size, %rdx