The PUSH register/memory instruction decrements the stack pointer by 2 and copies he contents of the specified 16-bit register or memory location to memory at
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The PUSH register/memory instruction decrements the stack pointer by 2 and copies he contents of the specified 16-bit register or memory location to memory at
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Chapter 6 - Procedures and Macros
Writing and using procedures
ͻ Write it in a separate subprogram and call that subprogram wheneǀer necessary.ͻ For that CALL instruction is used.
The CALL and RET instructions(contd.)
Stores the address of the next instruction to be executed after the CALL instruction to stack. This address is called as the return address. RET at the end of the procedure, it copies this value from stack back to the instruction pointer (IP).The CALL and RET instructions(contd.)
Chart for CALL and
RET instruction AE
The CALL and RET instructions(contd.)
Types of CALL :
WITHIN-SEGMENT NEAR CALL: produce the starting address of the procedure by adding a 16-bit signed displacement to the contents of the instruction pointer.
INTERSEGMENT FAR CALL: used when the called procedure is in different segment.Difference between NEAR and Far
NEARWithin Same CS
Replace old IP with new IP
Value of IP is Pushed on the
stackAlso called as Intrasegment call
FARWithin Different CS
Replace old pair CS:IP with new
pairValue of pair CS:IP is Pushed on
the stackAlso called as Intersegment call
Using PUSH and POP
The PUSH register/memory instruction decrements the stack pointer by 2 and copies he contents of the specified 16-bit register or memory location to memory at the new top-of-stack location. The POP register/memory instruction copies the word on the top-of- stack to the specified 16-bit register or memory location and increments the stack pointer by 2.Passing parameters to and from
procedures Major ways of passing parameters to and from a procedure:In register
In dedicated memory locations accessed by name
With the stack
Reentrant and Recursive procedures
Reentrant procedures: The procedure which can be interrupted, used and ͞reentered" without losing or writing oǀer anything. Recursive procedure: It is the procedure which call itself.Writing and using Assembler Macros
Comparison Macros and Procedures
A big advantage of using procedures is that the machine codes for the group of instruction in the procedures needs to be loaded in to main memory only once.
Disadvantage using the procedures is the need for the stack. A macro is the group of instruction we bracket and give a name to at the start of the program. Using macro avoids the overhead time involved in calling and returning from a procedures.