There are no stack push/pop instructions on the Nios. Write subroutines that conform to both the...
There are no stack push/pop instructions on the Nios. Write subroutines that conform to both the Nios architectural conventions and the course style guideline for pushing a 32-bit value onto the stack as well as popping the top 32-bit value from the stack.
Homework Answers
To store a 32 bit value on to a stack...we should use push mechanism.
to retrieve the 32 bit (4 byte)... we should use pop mechanism.
1 byte= 8 bits => 32 bits = 4 byte
Stack Pointer(SP) = It stores the address of top value of stack.
PUSH mechanism:
Please follow the below rules to push values onto stack
1. Decrement SP
2. copy the contents into the SP memory address location
3. continue 1 and 2 untill the 4 bytes are saved.
POP mechanism:
Please find the below rules for retrieving the values back:
1. copy the contents from SP memory address location.
2. Increment SP
3. continue step 1 and 2 untill the 4 bytes are retrieved.
PFA of the diagrametical view of push and pop.
PUSH B;
PUSH D
POP D
POP B
Hope this helps !!
Thanks :)
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