inline-assembly

问题 I am using the following code to set the cr0 bit to disable cache. When I compile this #include <stdio.h> int main() { __asm__("pushl %eax\n\t" "mov %cr0,%eax;\n\t" "orl $(1 << 30),%eax;\n\t" "mov %eax,%cr0;\n\t" "wbinvd\n\t" "popl %eax" ); return 0; } I am getting error saying that the operands are invalid for mov. Can anyone please point me to a good gcc x86-64 guide for doing these kinds of things? Also what exactly is wrong with the above code? 回答1: Ok, so finally I wrote the following

问题 I am using the following code to set the cr0 bit to disable cache. When I compile this #include <stdio.h> int main() { __asm__("pushl %eax\n\t" "mov %cr0,%eax;\n\t" "orl $(1 << 30),%eax;\n\t" "mov %eax,%cr0;\n\t" "wbinvd\n\t" "popl %eax" ); return 0; } I am getting error saying that the operands are invalid for mov. Can anyone please point me to a good gcc x86-64 guide for doing these kinds of things? Also what exactly is wrong with the above code? 回答1: Ok, so finally I wrote the following

问题 I am using the following code to set the cr0 bit to disable cache. When I compile this #include <stdio.h> int main() { __asm__("pushl %eax\n\t" "mov %cr0,%eax;\n\t" "orl $(1 << 30),%eax;\n\t" "mov %eax,%cr0;\n\t" "wbinvd\n\t" "popl %eax" ); return 0; } I am getting error saying that the operands are invalid for mov. Can anyone please point me to a good gcc x86-64 guide for doing these kinds of things? Also what exactly is wrong with the above code? 回答1: Ok, so finally I wrote the following

问题 This question already has answers here : How to access C variable for inline assembly manipulation? (2 answers) How to declare and initialize local variables in gcc inline assembly without extended inline asm? (1 answer) How to access C struct/variables from inline asm? (1 answer) manipulating c variable via inline assembly [duplicate] (1 answer) Why can't local variable be used in GNU C basic inline asm statements? (4 answers) Closed 7 days ago . I was given a task to convert a certain code

来源： https://stackoverflow.com/questions/5513513/cant-subtract-registers-in-an-addressing-mode

来源： https://stackoverflow.com/questions/5513513/cant-subtract-registers-in-an-addressing-mode

来源： https://stackoverflow.com/questions/64532771/why-does-cmov-always-return-t-val

来源： https://stackoverflow.com/questions/64532771/why-does-cmov-always-return-t-val

来源： https://stackoverflow.com/questions/18311242/retq-instruction-where-does-it-return

来源： https://stackoverflow.com/questions/4139892/access-specific-bit-in-embedded-x86-assembly