Data Types used in .DATA section

The following are the data types which are used in the .DATA section
All these spaces are reserved at the Compile Time

.byte = 1 byte
.ascii = string
.asciz = Null terminated string
.int = 32 bit integer
.short = 16 bit integer
.float = Single precision floating point number
.double = Double precision floating point number

The following are the data types which are used in the .BSS section
All these spaces are allocated at the Run Time
.comm - declares common memory area
.lcomm - declares a local common memory area

The program starts here.

bala@bala-laptop:~/ASM$ cat variable.s
#This program shows how to use Data types.
.data
    HelloEarth:
        .ascii "HelloEarth"
    ByteLocation:
        .byte 50
    Int32:
        .int 5
    Int16:
        .short 5
    Float:
        .float 50.55
    IntegerArray:
        .int 50,55,60,65,70
.bss
    .comm LargeBuff, 1000
.text
   
    .globl _start
    _start:
        nop
        #Exit Systemcall to exit the program
        movl $1, %eax
        movl $0, %ebx
        int $0x80
bala@bala-laptop:~/ASM$ as -gstabs -o variable.o variable.s
bala@bala-laptop:~/ASM$ ld -o variable variable.o
bala@bala-laptop:~/ASM$ gdb ./variable
Let us set a break point
(gdb) break *_start+1
Breakpoint 1 at 0x4000b1: file variable.s, line 23.
(gdb) run
Starting program: /home/bala/ASM/variable
Breakpoint 1, _start () at variable.s:23
23            movl $1, %eax
(gdb) info variables
All defined variables:
Non-debugging symbols:
0x00000000006000c0  HelloEarth
0x00000000006000ca  ByteLocation
0x00000000006000cb  Int32
0x00000000006000cf  Int16
0x00000000006000d1  Float
0x00000000006000d5  IntegerArray
0x00000000006000f0  LargeBuff
(gdb) x/11cb 0x00000000006000c0
0x6000c0 :    72 'H'    101 'e'    108 'l'    108 'l'    111 'o'    69 'E'    97 'a'    114 'r'
0x6000c8 :    116 't'    104 'h'    50 '2'
(gdb) x/1db 0x00000000006000ca
0x6000ca :    50
(gdb) x/1dw 0x00000000006000cb
0x6000cb :    5
(gdb) x/1dh 0x00000000006000cf
0x6000cf :    5
(gdb) x/1fw 0x00000000006000d1
0x6000d1 :    50.5499992
(gdb) x/5dw 0x00000000006000d5
0x6000d5 :    50    55    60    65
0x6000e5 :    70
(gdb) x/100db 0x00000000006000f0
0x6000f0 :    0    0    0    0    0    0    0    0
0x6000f8 :    0    0    0    0    0    0    0    0
0x600100 :    0    0    0    0    0    0    0    0
0x600108 :    0    0    0    0    0    0    0    0
0x600110 :    0    0    0    0    0    0    0    0
0x600118 :    0    0    0    0    0    0    0    0
0x600120 :    0    0    0    0    0    0    0    0
0x600128 :    0    0    0    0    0    0    0    0
0x600130 :    0    0    0    0    0    0    0    0
0x600138 :    0    0    0    0    0    0    0    0
0x600140 :    0    0    0    0    0    0    0    0
0x600148 :    0    0    0    0    0    0    0    0
---Type to continue, or q to quit---