From: nowhere@nevernet.at   
      
   On 13/02/2022 16:50, James Harris wrote:   
      
   [about stack...]   
   > Not sure what you mean but AIUI the B bit (big bit) of the SS descriptor   
   > selects the size of stack pointer (32-bit ESP or 16-bit SP) used for   
   > implicit stack references.   
      
   > Rather than having all segments 32-bit or all segments 16-bit it is   
   > looking more and more likely that a programmer could use any arbitrary   
   > mix of 16-bit and 32-bit segments - even on current processors - so   
   > having a 'big' code segment would make operands and addresses default to   
   > 32-bit while simultaneously having a 'small' stack segment would make   
   > implicit stack references use SP rather than ESP.   
      
   you mean implicit stack references (all push pop call return)?   
      
   BUT how about   
   PM32:   
   8B 44 24 fc     mov eax.[esp-04]  ;SP or ESP depending on seg-size ?   
   RM:   
   67 8B 44 24 fc  mov ax,[esp-04]   ;could have an UnReal flat big stack   
      
   and I'm not sure yet if my mixed code CALL/RET work on SP only due to   
   my 16 bit stack. OK I use 66 c3 and 66 E8xxxxxxxx here and there and my   
   esp is always in 16 bit range (initially decided to fit BIOS calls).   
   So I never noticed it's using only SP.   
   __   
   wolfgang   
      
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