1. a. Suppose in a five-bit system. A = 0b10000, B = 0b10000. What are the...

 

  
 

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1. a. Suppose in a five-bit system. A = 0b10000, B = 0b10000. What are the overflow and carry flags when adding A and B. b. (5 points) For Cortex-M4, there is no separate multiplication instruction for signed integers and unsigned integers. Why does the same multiplication instruction work for both signed integers and unsigned integers? 4. (5 points) Complete the assembly implementation of sum2. Assembly Program C Program long sum2 (long long a1, long long a2); int main() { long long t; t=sum2(1, 2); while (1); } long longsum2 (long long al, long long a2){ long long total; total = a1 + a2; return total; } AREA sum, CODE EXPORT___main ALIGN ENTRY __main PROC rt MOV re, #1 MOV r1, #0 MOV r3, #2 MOV r4, #0 BL sum2 stop B stop ENDP sum2 PROC ; ; 1st 64-bit argument ENDP AREA myData, DCQ e END ; 2nd 64-bit argument ; result in r1: re LDR r3, =t STR re, [r3]; STR r1, [r3, 4] ; LR points to stop ; memory address of t save lower 32 bits ; save upper 32 bits. ; re- 3, r10 in ; this example ; name of procedure ; end of procedure DATA ; allocate 8 bytes ; end of program 5. (5 points) What are the advantages of 'Registers' over memory? Please explain different resisters in STM32L Low Registers High Registers 32 bits RO R1 R2 R4 R5 R6 R7 R8 R9 R10 R11 R12 R13 (SP) R14 (LR) R15 (PC) General Purpose Register R13 (MSP) R13 (PSP) 32 bits XPSR BASEPRI PRIMASK FAULTMASK CONTROL Special Purpose Register 1. a. Suppose in a five-bit system. A = 0b10000, B = 0b10000. What are the overflow and carry flags when adding A and B. b. (5 points) For Cortex-M4, there is no separate multiplication instruction for signed integers and unsigned integers. Why does the same multiplication instruction work for both signed integers and unsigned integers? 4. (5 points) Complete the assembly implementation of sum2. Assembly Program C Program long sum2 (long long a1, long long a2); int main() { long long t; t=sum2(1, 2); while (1); } long longsum2 (long long al, long long a2){ long long total; total = a1 + a2; return total; } AREA sum, CODE EXPORT___main ALIGN ENTRY __main PROC rt MOV re, #1 MOV r1, #0 MOV r3, #2 MOV r4, #0 BL sum2 stop B stop ENDP sum2 PROC ; ; 1st 64-bit argument ENDP AREA myData, DCQ e END ; 2nd 64-bit argument ; result in r1: re LDR r3, =t STR re, [r3]; STR r1, [r3, 4] ; LR points to stop ; memory address of t save lower 32 bits ; save upper 32 bits. ; re- 3, r10 in ; this example ; name of procedure ; end of procedure DATA ; allocate 8 bytes ; end of program 5. (5 points) What are the advantages of 'Registers' over memory? Please explain different resisters in STM32L Low Registers High Registers 32 bits RO R1 R2 R4 R5 R6 R7 R8 R9 R10 R11 R12 R13 (SP) R14 (LR) R15 (PC) General Purpose Register R13 (MSP) R13 (PSP) 32 bits XPSR BASEPRI PRIMASK FAULTMASK CONTROL Special Purpose Register

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Advantages of Registers over Memory Registers are faster than memory as they are located in the processor and can be accessed directly This makes them ... View the full answer