qtspim

So I've seen a lot of questions on generating random integers in a MIPS program using MARS and syscall 42 and that's ok. The problem is that I need to generate a random integer for a program compiled with QtSpim , which has no syscall for 42 or however for calls greater than 17. I can't figure out getting something like a random value from the system like syscall 30 in MARS which gives the system time. Is there a way to get a random address or hex value to use for a random int generator using xor operations ? Any help would be appreciated. 来源： https://stackoverflow.com/questions/44875451

How can I declare an array at memory location 100(Decimal) in a MIPS program? The spim simulator supports the optional data directive argument as detailed here . .data <addr> The following data items should be stored in the data segment. If the optional argument addr is present, the items are stored beginning at address addr . Therefore, using spim , you can store any data at an exact address as long as it is within the range of the user data segment. In spim , the reserved range is 0x10000000 - 0x10040000 . So, for example, if you wanted to store an array at address 0x10000030 you would write

I'm trying to code this recursive function into MIPS. My problem is I'm not sure how I can do the recursive step. I'm pretty sure I got the rest correct. int recur(int n) { if(n == 1 || n == 2) { return 2; } else { return (n-4)+n*recur(n-2); } } .data promptMessage: .asciiz "Enter a number that is greater than or equal to 0: " resultMessage: .asciiz "\nThe answer is: " input: .word 0 answer: .word 0 .text .globl main main: #Read the number from the user li $v0, 4 la $a0, promptMessage syscall li $v0, 5 syscall sw $v0, input #Call the function lw $a0, input jal recur sw $v0, answer #Display

I'm trying to compute (a * c) - (b / d), and so far my assembly code is: .data A: .word 5 B: .word 6 C: .word 3 D: .word 2 .text lw $t0, A lw $t1, C mul $t0, $t0, $t1 lw $t1, B lw $t2, D div $t1, $t1, $t2 sub $t0, $t0, $t1 li $v0, 1 move $a0, $t0 syscall li $v0, 10 syscall But when I run it, I get the error. I am new to QTSpim and assembly so I would appreciate some help if possible. Thank you! edit: the exact error is: "Instruction references undefined symbol at 0x00400014 [0x00400014] 0x0c000000 jal 0x0000000 [main] ;188: jal main" The default startup code expects your program to have a