From: Melzzzzz@nospicedham.zzzzz.com   
      
   On 2017-11-28, vince@nospicedham.pianoman.cluster.toy  wrote:   
   > On 2017-11-28, Richmond  wrote:   
   >> I am trying to read a key from the keyboard. I have switched off   
   >> canonical mode so it doesn't wait for the return key. But it does not   
   >> seem to pick up the key in AX.   
   >   
   > is this on Linux?  x86_64?   
   >   
   > Is there any reason you're not using the "syscall" instruction?   
   > int 0x80 is deprecated on x86_64.   
   >   
   > ALso on x86_64 the system call numbers are different, I think sys_read   
   > is syscall #0   
   >   
   > A great tool for debugging things like this is the "strace" program which   
   > will show all system calls and arguments from your program.   
      
   Yeah, I just noticed he uses 32 bit calling convention for syscalls ;)   
   params go   
   rdi   
   rsi   
   rdx   
   r10   
   r8   
   r9   
   rax=syscall number   
   and syscall instruction instead of int 080h   
   but his problem is wrong number for stdin if all else works ;p   
      
   >   
   > Vince   
   >   
   >>   
   >> GCHAR:  push rax   
   >>         push rbx   
   >>         push rcx   
   >>         push rdx   
   >>         mov rsi, charbuffer    ; buffer = address to store the bytes read   
   >>         mov rcx,rsi   
   >>         mov rdx, 0x4        ; number of bytes to read   
   >>                            (setting this to 1 makes no difference)   
   >>         mov rax, 0x3        ; number for sys_read   
   >>         mov rbx, 0x2        ; From stdin   
   >>         int 0x80   
   >>         MSPRINT "Byte read is "   
   >>         MOV AX,[charbuffer]   
   >>         CALL PWORD   
   >>         pop rdx   
   >>         pop rcx   
   >>         pop rbx   
   >>         pop rax   
   >>         RET   
      
      
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