Using only 3 ARM instructions without using any LDR or STR instructions, show how to store the current value of the frame pointer in the stack, make the frame pointer to point to the base of this frame, and create an 8-byte stack frame while the stack pointer to point to the top of the stack. Assume that an FD stack is in use, appropriate stack space is already allocated to the stack, and the stack pointer is appropriately initialized. The first instruction is The second instruction is The third instruction is O Mark for Review What's This?

Using only 3 ARM instructions without using any LDR or STR instructions, show how to store the current value of the frame pointer in the stack, make the frame pointer to point to the base of this frame, and create an 8-byte stack frame while the stack pointer to point to the top of the stack. Assume that an FD stack is in use, appropriate stack space is already allocated to the stack, and the stack pointer is appropriately initialized. The first instruction is The second instruction is The third instruction is O Mark for Review What's This?

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Using only 3 ARM instructions without using any LDR or STR instructions, show how to store the current value of the frame pointer in the stack, make the frame pointer to point to the base of this frame,
and create an 8-byte stack frame while the stack pointer to point to the top of the stack. Assume that an FD stack is in use, appropriate stack space is already allocated to the stack, and the stack pointer is
appropriately initialized.
The first instruction is
The second instruction is
The third instruction is
O Mark for Review What's This?

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This question assumes the machine architecture at the right. Note the stack pointer register, SP, is not part of the register file. SEL is a multiplexor used to select one of the inputs to the ALU. Assume memory addresses require only one memory cycle to fetch or store (unlike the 68000). MAR Register File (RO-RI5) MDR Show the machine code control IR constants sequence of an instruction that will set a block of from 1 to 127 memory locations to zero. The size of the block is in RO and the address of the block is in R1. Assume the instruction fetch sequence is the same as in Question 4 and start with the next step. R0 and R1 can change in the execution of the sequence. SEL PC SP ALU TEMP Status
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Using only 3 ARM instructions without using any LDR or STR instructions, show how to store the current value of the frame pointer in the stack, make the frame pointer to point to the base of this frame, and create an 8-byte stack frame while the stack pointer to point to the top of the stack. Assume that an FD stack is in use, appropriate stack space is already allocated to the stack, and the stack pointer is appropriately initialized. The first instruction is The second instruction is The third instruction is
In some instruction sets, call and return instructions make use of a RR register to hold the return address rather than doing so on the stack. Show how the code in the above problem should be changed if call and return instructions used a RR register for return addresses rather than the stack. Don't change the program's function. 500 MOV R1, X 501 MOV R2, Y 502 MOV R3, Z 503 PUSH R1 504 CALL 550 505 POP R3 506 CALL 560 507 HALT · · 550 PUSH R2 551 CALL 560 552 POP R2 553 RET · · 560 PUSH R3 561 PUSH R1 562 POP R2 563 POP R1 564 RET
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Assume that you are writing an ARM assembly program, and this program will call my_fun (int x, int *x) function. Before calling the function, you need to push the parameters onto the stack. You are only allowed to use r0 as a working register to save any temporary value in it during the pushing operation if needed. You are not allowed to use LDM or STM instructions in this question. If you write any constant inside the instructions, you need to use decimal numbers only without any leading (insignificant) zeros. The parameter x that you will use is located at address FP - 8. The stack in this program is an Empty Descending stack, its space is appropriately allocated, and the SP is appropriately initialized. Write 2 ARM assembly instructions to push x onto the stack. The 1st instruction is: The 2nd instruction is: Write 2 ARM assembly instructions to push *x onto the stack. The 1st instruction is: The 2nd instruction is:
3. The table below represents a stack stored in a contiguous block of memory cells (as discussed in the text). If the base of the stack is at address 0x10 and the stack pointer contains the value 0x12, what value is retrieved by a pop instruction? What value is in the stack pointer after the pop operation? Address 0x10 0x11 0x12 0x13 0x14 Contents 'F' 'C' 'A' 'B' 'E'