External Data and Text

1
External Data and Text
2
Memory sections

• Operating System
• Text
• Data
• Bss
• Stack
• Location counter for each

0x0000
OS
0x2000
text
data
bss
stack
3
Text section

• Executable text
• Starting from address 0x2000
• Program counter starts at zero

4
Data section

• Initialized data
• .section .data
• V .word
• V .byte
• V .half
• .skip 4n
• .align n

• .section .data
• V1 .word 4
• V2 .byte 5
• .align 2
• V3 .half 4
• V4 .byte 6
• .align 4
• V5 .word 17

5
ASCII data

• Enclose in for ASCII code
• Character
• Ch .byte 150
• Ch .byte h
• String
• .ascii hello
• .asciz hello

6
bss section

• Zero initialized variables
• .section .bss
• .align 4
• Ary .skip 4100
• i_m .skip 4
• .common ary, 4n, 4