mips

问题 What is the difference between dynamic and static instruction count? a. Derive an expression to calculate the user CPU time as a function of following parameters: the dynamic instruction count (N), clock cycle per instruction (CPI) and clock frequency (f) b. Explain the reason for choosing ‘dynamic’ instruction count as a parameter in Question 3a instead of ‘static’ instruction count 回答1: The dynamic instruction count is the actual number of instructions executed by the CPU for a specific

问题 I'm implementing a simple single-cycle MIPS processor for a class, and the only operations we implemented are lw , sw , j , addi , or , and , add , sub , beq , slt , jr , andi , jal , bne and sll . I have to write a MIPS file testing a factorial function. Obviously, I can't use instructions that haven't been implemented but since factorial means: result = n * factorial(n-1) , I need a way to multiply two values. Is there a way to do that with the instructions mentioned earlier? EDIT: I got it

问题 I am wondering if there is any difference between the MIPS syscall and trap instructions. I can't find anything involving this, so I am not sure if there is a difference. Traps seem to just be a conditional syscall, but some clarifying can be helpful. 回答1: The SYSCALL and TRAP instructions both trigger exceptions, but the resulting exception is of a different type (SystemCall versus Trap), and the operating system will likely handle them differently. 回答2: A Trap is an exception switches to

问题 I am wondering if there is any difference between the MIPS syscall and trap instructions. I can't find anything involving this, so I am not sure if there is a difference. Traps seem to just be a conditional syscall, but some clarifying can be helpful. 回答1: The SYSCALL and TRAP instructions both trigger exceptions, but the resulting exception is of a different type (SystemCall versus Trap), and the operating system will likely handle them differently. 回答2: A Trap is an exception switches to

问题 I'm having some problems in creating a program to encrypt a message. At this point i'm just trying to input a char and the output should be the char+5 positions in the alphabet. So the program should read the char in ASCII and add 5 to it and then print the letter. Ex.: Input: A Output: F It should only work for Capital letters, so every char should be >=65 and <=90. So, if I write 'Z' it should start the alphabet from the beginning and print 'E'. So far, my code looks like this: li $v0, 8

问题 I'm having some problems in creating a program to encrypt a message. At this point i'm just trying to input a char and the output should be the char+5 positions in the alphabet. So the program should read the char in ASCII and add 5 to it and then print the letter. Ex.: Input: A Output: F It should only work for Capital letters, so every char should be >=65 and <=90. So, if I write 'Z' it should start the alphabet from the beginning and print 'E'. So far, my code looks like this: li $v0, 8

问题 My program is suppose to read an integer and print it back to the user but every time it just prints 268501230 no matter what is entered. Any help would be appreciated. .data prompt2: .asciiz "Please enter value: " array1: .space 40 array2: .space 40 buffer: .space 4 .text main: #Prints the prompt2 string li $v0, 4 la $a0, prompt2 syscall #reads one integer from user and saves in t0 li $v0, 5 la $t0, buffer syscall li $v0, 1 li $t0, 5 # $integer to print syscall exitProgram: li $v0, 10 #

问题 My program is suppose to read an integer and print it back to the user but every time it just prints 268501230 no matter what is entered. Any help would be appreciated. .data prompt2: .asciiz "Please enter value: " array1: .space 40 array2: .space 40 buffer: .space 4 .text main: #Prints the prompt2 string li $v0, 4 la $a0, prompt2 syscall #reads one integer from user and saves in t0 li $v0, 5 la $t0, buffer syscall li $v0, 1 li $t0, 5 # $integer to print syscall exitProgram: li $v0, 10 #

问题 How can I run valgrind on an embedded Linux box to find memory leaks in my main software? In the rcS script, I am running like this: ./main_app How can I associate the ./main_app program with valgrind? The main_app process never terminates. I want to constantly log the data to file. Also, I want to access the log file without terminating the main_app process. I can do telnet and can access the log file. But the problem is until and unless the handler is closed, how can I open the file i.e. I

问题 How can I run valgrind on an embedded Linux box to find memory leaks in my main software? In the rcS script, I am running like this: ./main_app How can I associate the ./main_app program with valgrind? The main_app process never terminates. I want to constantly log the data to file. Also, I want to access the log file without terminating the main_app process. I can do telnet and can access the log file. But the problem is until and unless the handler is closed, how can I open the file i.e. I