Question

In: Computer Science

#include <stdio.h> #include <stdint.h> char sz_1[] = "Upper/LOWER."; char sz_2[] = "mIXeD CaSe.."; /* copies psz_2...

#include <stdio.h>
#include <stdint.h>

char sz_1[] = "Upper/LOWER.";
char sz_2[] = "mIXeD CaSe..";


/* copies psz_2 to psz_1, downcases all letters */
void dostr (char* psz_1,char* psz_2) {
uint8_t u8_c;

while (*psz_2 != 0) {
u8_c = *psz_2;
if (u8_c > 0x2F) {
/* make sure it is not a special char */
*psz_1 = u8_c | 0x20; /* sets this bit */
} else {
/* leave special chars alone */
*psz_1 = u8_c;
}
psz_1++;
psz_2++;
}

}

int main(void) {
// Bug: MPLAB X v1.80 printf bug means strings vis %s don't print correctly.
// So, break printf into two statements.
printf("Before...\n");
printf("sz_1: '"); printf(sz_1); printf("'\n");
printf("sz_2: '"); printf(sz_2); printf("'\n");
dostr(sz_1,sz_2);
printf("After...\n");
printf("sz_1: '"); printf(sz_1); printf("'\n");
printf("sz_2: '"); printf(sz_2); printf("'\n");
return 0;
}
convert it in assembly

Solutions

Expert Solution

Answer.

Step 1

ASSEMBLY LANGUAGE:

  • Assembly language is basically the low level language which is used for various kinds of processors for specific purposes.
  • For every high level language, when it is compiled it generates a low level code which is termed as assembly code.
  • As assembler is required to convert the assembly language code to the machine language code.
  • For different processor architecture, assembly language code is different while it consists of similar kinds of instruction and operations for various architecture.
  • Example of instructions that are used in assembly language are:
    • MOV - This instruction command is used to move the content from one location to other.
    • SUB - This instruction command is used to perform the subtraction operation
    • POP - This instruction command is used to take element from the stack
    • INT - This instruction command is used to interrupt any process

Step 2

CONVERTED ASSEMBLY CODE:

sz_1:   

        .string "Upper/LOWER."

sz_2:

        .string "mIXeD CaSe.."

dostr: // these block of statements defines the method signature

        push    rbp

        mov     rbp, rsp

        mov     QWORD PTR [rbp-24], rdi

        mov     QWORD PTR [rbp-32], rsi

        jmp     .L2 // start the while loop

.L5:

        mov     rax, QWORD PTR [rbp-32] // these statements are for assigning the pointer value

        movzx   eax, BYTE PTR [rax]

        mov     BYTE PTR [rbp-1], al

        cmp     BYTE PTR [rbp-1], 47 // statements for the if condition

        jbe     .L3

        movzx   eax, BYTE PTR [rbp-1] // statements for pointer assignments

        or      eax, 32

        mov     edx, eax

        mov     rax, QWORD PTR [rbp-24]

        mov     BYTE PTR [rax], dl

        jmp     .L4

.L3:

        movzx   edx, BYTE PTR [rbp-1] // again statements for pointer assignments

        mov     rax, QWORD PTR [rbp-24]

        mov     BYTE PTR [rax], dl

.L4:

        add     QWORD PTR [rbp-24], 1 // increment in pointer variable

        add     QWORD PTR [rbp-32], 1 // again increment in the pointer variable

.L2:

        mov     rax, QWORD PTR [rbp-32]

        movzx   eax, BYTE PTR [rax]

        test    al, al

        jne     .L5

        nop

        nop

        pop     rbp

        ret

.LC0:

        .string "Before..."

.LC1:

        .string "sz_1: '"

.LC2:

        .string "'"

.LC3:

        .string "sz_2: '"

.LC4:

        .string "After..."

main: // start the main function definition

        push    rbp

        mov     rbp, rsp

        mov     edi, OFFSET FLAT:.LC0 // printf statement conversion

        call    puts

        mov     edi, OFFSET FLAT:.LC1 // display the value using printf command

        mov     eax, 0

        call    printf

        mov     edi, OFFSET FLAT:sz_1

        mov     eax, 0

        call    printf

        mov     edi, OFFSET FLAT:.LC2

        call    puts

        mov     edi, OFFSET FLAT:.LC3 // command to display the value using printf

        mov     eax, 0

        call    printf

        mov     edi, OFFSET FLAT:sz_2   

        mov     eax, 0

        call    printf

        mov     edi, OFFSET FLAT:.LC2

        call    puts

        mov     esi, OFFSET FLAT:sz_2 // calls the function with the required parameters

        mov     edi, OFFSET FLAT:sz_1

        call    dostr

        mov     edi, OFFSET FLAT:.LC4 // print the space using printf command

        call    puts

        mov     edi, OFFSET FLAT:.LC1 // print the command using printf command

        mov     eax, 0

        call    printf

        mov     edi, OFFSET FLAT:sz_1

        mov     eax, 0

        call    printf

        mov     edi, OFFSET FLAT:.LC2

        call    puts

        mov     edi, OFFSET FLAT:.LC3 // display the values using the printf command

        mov     eax, 0

        call    printf

        mov     edi, OFFSET FLAT:sz_2

        mov     eax, 0

        call    printf

        mov     edi, OFFSET FLAT:.LC2

        call    puts

        mov     eax, 0 // return 0 command

        pop     rbp // closing curly braces

        ret

Kindly upvote please,

Thank you.

venereology answered 2 months ago
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