COMPUTER SYSTEMS&MOD MSGT/ET SA AC PKG
3rd Edition
ISBN: 9780134671123
Author: Bryant
Publisher: PEARSON
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Question
Chapter 4, Problem 4.45HW
A.
Program Plan Intro
Given Assembly code:
subq $8, %rsp
movq REG, (%rsp)
Data movement instructions:
- The different instructions are been grouped as “instruction classes”.
- The instructions in a class performs same operation but with different sizes of operand.
- The “Mov” class denotes data movement instructions that copy data from a source location to a destination.
- The class has 4 instructions that includes:
- movb:
- It copies data from a source location to a destination.
- It denotes an instruction that operates on 1 byte data size.
- movw:
- It copies data from a source location to a destination.
- It denotes an instruction that operates on 2 bytes data size.
- movl:
- It copies data from a source location to a destination.
- It denotes an instruction that operates on 4 bytes data size.
- movq:
- It copies data from a source location to a destination.
- It denotes an instruction that operates on 8 bytes data size.
- movb:
Unary and Binary Operations:
- The details of unary operations includes:
- The single operand functions as both source as well as destination.
- It can either be a memory location or a register.
- The instruction “incq” causes 8 byte element on stack top to be incremented.
- The instruction “decq” causes 8 byte element on stack top to be decremented.
- The details of binary operations includes:
- The first operand denotes the source.
- The second operand works as both source as well as destination.
- The first operand can either be an immediate value, memory location or register.
- The second operand can either be a register or a memory location.
Jump Instruction:
- The “jump” instruction causes execution to switch to an entirely new position in program.
- The “label” indicates jump destinations in assembly code.
- The “je” instruction denotes “jump if equal” or “jump if zero”.
- The comparison operation is performed.
- If result of comparison is either equal or zero, then jump operation takes place.
- The “ja” instruction denotes “jump if above”.
- The comparison operation is performed.
- If result of comparison is greater, then jump operation takes place.
- The “pop” instruction resumes execution of jump instruction.
- The “jmpq” instruction jumps to given address. It denotes a direct jump.
A.
Expert Solution
![Check Mark](/static/check-mark.png)
Explanation of Solution
Behavior of instruction pushq:
- No, the given code sequence is not correctly describes the behavior of given instruction.
- The instruction “subq $8, %rsp” subtracts 8 from value of “%rsp”.
- If “REG” denotes “%rsp” then it computes “%rsp-8”.
- The instruction “movq REG, (%rsp)” moves value of “REG” into location of “(%rsp)”.
- The value “%rsp-8” is been pushed into stack instead of “%rsp”.
- Hence, it does not describe behavior of instruction “pushq %rsp”.
B.
Program Plan Intro
Given Assembly code:
subq $8, %rsp
movq REG, (%rsp)
Processing stages:
- The processing of an instruction has number of operations.
- The operations are organized into particular sequence of stages.
- It attempts to follow a uniform sequence for all instructions.
- The description of stages are shown below:
- Fetch:
- It uses program counter “PC” as memory address to read instruction bytes from memory.
- The 4-bit portions “icode” and “ifun” of specifier byte is extracted from instruction.
- It fetches “valC” that denotes an 8-byte constant.
- It computes “valP” that denotes value of “PC” plus length of fetched instruction.
- Decode:
- The register file is been read with two operands.
- It gives values “valA” and “valB” for operands.
- It reads registers with instruction fields “rA” and “rB”.
- Execute:
- In this stage the ALU either performs required operation or increments and decrements stack pointer.
- The resulting value is termed as “valE”.
- The condition codes are evaluated and destination register is updated based on condition.
- It determines whether branch should be taken or not in a jump instruction.
- Memory:
- The data is been written to memory or read from memory in this stage.
- The value that is read is determined as “valM”.
- Write back:
- The results are been written to register file.
- It can write up to two results.
- PC update:
- The program counter “PC” denotes memory address to read bytes of instruction from memory.
- It is used to set next instruction’s address.
- Fetch:
B.
Expert Solution
![Check Mark](/static/check-mark.png)
Explanation of Solution
Modified code:
movq REG, -8(%rsp)
subq $8, %rsp
Explanation:
- The instruction “movq REG, -8(%rsp)” moves value of “REG” into location of “(%rsp)-8”.
- The instruction “subq $8, %rsp” subtracts 8 from value of “%rsp”.
- If “REG” denotes “%rsp” then it computes “%rsp”.
- The value “%rsp” is now been pushed into stack.
- Hence, it describes behavior of instruction “pushq %rsp”.
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Chapter 4 Solutions
COMPUTER SYSTEMS&MOD MSGT/ET SA AC PKG
Ch. 4.1 - Prob. 4.1PPCh. 4.1 - Prob. 4.2PPCh. 4.1 - Prob. 4.3PPCh. 4.1 - Prob. 4.4PPCh. 4.1 - Prob. 4.5PPCh. 4.1 - Prob. 4.6PPCh. 4.1 - Prob. 4.7PPCh. 4.1 - Prob. 4.8PPCh. 4.2 - Practice Problem 4.9 (solution page 484) Write an...Ch. 4.2 - Prob. 4.10PP
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