Final answer:
To create a procedure in assembly to check the parity of a bit stream, use bitwise operations to iterate through bits and count the number of ones. Set an indicator for the main program to refer to after the procedure completes. The implementation details will vary according to the assembly language and system conventions.
Step-by-step explanation:
Assembly Procedure for Checking Bit Parity
To write an assembly program that calls a procedure to check the parity of a stream of bits, you will need to understand how to manipulate bits and count the number of ones present. Depending on the language you're using (such as x86 assembly), you could use bitwise operations to examine each bit. The procedure would iterate through the bits and use an XOR operation to toggle a flag or could increment a counter for each set bit encountered.
After iterating through all the bits, if the count is even, the parity is even; if the count is odd, the parity is odd. You can then set a register or a flag to indicate the result, which the main program can check after the procedure call.
Here's a basic outline of what the assembly code could look like:
; Assume 'bits' is an array of bytes containing the bit stream
; and 'length' is the number of bytes in the array
check_parity_proc:
xor eax, eax ; Clear register to use as a counter
; More instructions for iterating over bits and checking parity
; ...
ret ; Return from procedure
The procedure must be called from the main program after initializing the data that represents the bit stream. An example call could be:
; Assembly code to initialize data and call 'check_parity_proc'
main_program:
; Instructions to set up 'bits' and 'length'
call check_parity_proc
; Instructions to handle the result (parity) after the call
; ...
The exact implementation will depend on the specific assembly language you are using and the calling conventions of your system.