我可以在内联汇编中使用中断吗

Question

I want to use interrupts in inline asm but it is not letting me I think my app is this

__asm__("movb %ah,9;" 
"movb %al,0x41;" 
"movb %bh,0x0;" 
"movw %cx,0x1; "
"movb %bl,0x0F ;" 
"int $10; ");

I am getting nothing after running this just a blank space what should I do?

Answer 1

Can i use interrupts in inline assembly?

Yes, as long as the interrupt exists and you inform the compiler of how to deal with it correctly (eg "clobber list" to tell the compiler which registers changed, etc). See the GCC manual and https://stackoverflow.com/tags/inline-assembly/info

And as long as you use the correct number, likely you wanted int $0x10 instead of int $10 . And you'll want to mov immediates into registers, not mov registers to absolute memory addresses.

If that doesn't work, I'd be tempted to suspect that you're trying to use BIOS "video services" to print a character on the screen; but you're not in real mode (and doing it in 32-bit code or 64-bit code); and the BIOS might not exist at all (eg a UEFI system); and an OS may have taken over control of the hardware (and broken all the assumptions that BIOS expects, like disabling obsolete "legacy junk emuation" in certain devices, reconfiguring memory, and timers and interrupt controllers; so that even if BIOS exists and you're in real mode you still can't use it safely).