We can allocate string literals and global variables in the .data section of an

Question

We can allocate string literals and global variables in the .data section of an assembly language program. Write MARS

directives which would allocate the following C-like variables in the .data section.

char ch1 = ' ', ch2 = '$'; // Assume char variables/values are 1-byte
int x = 0, y = -1, z; // Assume int variables/values are 4-bytes
char *name = "Marge Simpson"; // name is a label assoc'd with the address of the first char int iarray[250] = { 0 }; // iarray is an array of 250 ints, all initialized to 0
char carray[250] = { 0 }; // carray is an array of 250 chars, all initialized to 0

Explanation / Answer

Data declaration and initiallized .data segment in the assembly program

The following are declareation of varibales and literals using MARS directives

.data

ch1: .byte 32          # Allocates 1 byte initialized to space, ' ' since 32 is ascii of space

ch2: .byte 36          # Allocates 1 byte initialized to space, '$' since 36 is ascii of dollar

name : .string "Marge Simpson" # Declare 13 bytes starting at the address str initialized to

           the ASCII character values for hello followed by a nul (0) byte.

x: .long 0          # Allocates 1 byte initialized to 0

y: .long -1         # Allocates 1 byte initialized to -1

z: .long            # Allocates 1 byte

array1: .byte 0 : 250 # Allocates 250 bytes, all initiailizedd to 0

carray: .byte 0 : 250 # Allocates 250 bytes, all initiailizedd to 0

Related Questions

Navigate

• Browse (All)
• Browse W
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.