The CALL address can be specified directly or through registers or memory locations. Load CS with new segment address. Load IP with new offset address.
Control transferred to a sub routine in the new segment. The CS does not change. A negative displacement means that the jump is behind in the program. It is also called relative jump.
INTRA segment indirect jump- The new branch address is specified indirectly through a register or a memory location. The value in the IP is replaced with the new value. CALL is an instruction that transfers the program control to a sub routine with the intention of coming back to the main program. At the end of the sub routine, control transfers back to the main program using the return address of the stack.
The new address is calculated by adding the 8 or 16 bit displacement to the IP. A positive displacement means that the jump is ahead in the program. Both CS and IP get new values as this is an inter segment jump. Now study on-the-go. Find useful content for your engineering study here. Questions, answers, tags - All in one app!
Connect and share knowledge within a single location that is structured and easy to search. How does it relate to the higher level concepts such as a GOTO or a procedure call? Am I correct in the comparison?
JUMP or GOTO is a transfer of the control to another location and the control does not automatically return to the point from where it is called. Due to this difference in their nature, languages typically make use of a stack and a stack frame is pushed to "remember" the location to come back for each procedure called. This behaviour applies to recursive procedures too. In case of tail recursion, there is however no need to "push" a stack frame for each call.
The main difference is:. In the sample case of a single function with tail recursion, then the compiler may be able to reuse the existing stack frame. However, it can become more complicated with mutually recursive functions:.
Consider the case where ping and pong are more complex functions that take different numbers of parameters. Mark Probst's paper talks about tail recursion implementation for GCC in great detail. A jump instruction will change the program counter to continue execution at a different part of the program.
Also, for the reason that a call stack is used when making function calls, pushing too many return addresses to the call stack by recursion will cause a stack overflow. When learning assembly, I find it easier when dealing with RISC processors than x86 processors, as it tends to have less instruction and simpler operations. One correction to your thoughts: It is not only with tail recursion , but generally with tail calls , that we don't need the stack frame and hence simply could JMP there provided the arguments have been set up correctly.
According to microprocessor, firstly the condition is checked and then it performs jump operations goes to other code and does not return. Call operation is like a function callig in the c language and when the function is performed it returns back to complete its execution.
Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Asked 12 years, 9 months ago. Active 2 years, 9 months ago. Viewed 35k times. Your answers and comments will be much appreciated. Andronicus 24k 15 15 gold badges 43 43 silver badges 84 84 bronze badges. Add a comment. Active Oldest Votes. The main difference is: JMP performs a jump to a location, without doing anything else CALL pushes the current instruction pointer on the stack rather: one after the current instruction , and then JMPs to the location.
With a RET you can get back to where you were.
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