GAS LISTING ac.s 			page 1


   1              		.file	"add2.s"
   2              		.version	"01.01"
   3              	gcc2_compiled.:
   4              	.globl buff
   5              	.data
   6              	        .align 32
   7              	        .type    buff,@object
   8              	        .size    buff,80
   9              	buff:
  10 0000 35       	        .ascii "5"
  11 0001 20706C75 	        .ascii " plus "
  11      7320
  12              	buff1:
  13 0007 35       	        .ascii "5"
  14 0008 20706C75 	        .ascii " plus "
  14      7320
  15              	buff2:
  16 000e 34       	        .ascii "4"
  17 000f 20657175 	        .ascii " equals "
  17      616C7320 
  18              	buff3:
  19 0017 39       	        .ascii "9"
  20 0018 0A00     	        .string "\n"
  21 001a 00000000 	        .zero 62
  21      00000000 
  21      00000000 
  21      00000000 
  21      00000000 
  22              	.section        .rodata
  23              	.text
  24              		.align 4
  25              	.globl main
  26              		.type	 main,@function
  27              	main:
  28 0000 55       		pushl %ebp		# Save the old frame pointer
  29 0001 89E5     		movl %esp, %ebp		# Start a new fram here
  30 0003 6A19     		pushl $25               # Setup buffer size
  31 0005 68000000 		pushl $buff             #  buffer start address and 
  31      00
  32 000a 6A01     		pushl $1                #  file descriptor for standard out
  33 000c E8FCFFFF 		call write              #  and use low-level write service
  33      FF
  34 0011 83C40C   		addl $12, %esp          # Reset stack pointer
  35 0014 8B450C   	        movl 12(%ebp),%eax      # Get the pointer to the start of argv
  36 0017 8B5004   	        movl 4(%eax),%edx       # Get the ptr to the second argument
  37 001a 8B12     	        movl (%edx), %edx       # Get the 1st ASCII number (and three other bytes)
  38              	#	movsbl (%edx), %edx     # Get the 1st ASCII number 
  39 001c 88150000 	        movb %dl, buff          # Put an ASCII 1 in the buffer
  39      0000
  40 0022 832D0000 	        sub $'0', buff          #  and make it binary
  40      000030
  41 0029 C6050700 	        movb $'4', buff1        # Put an ASCII 1 in the buffer
  41      000034
  42 0030 832D0700 	        sub $'0', buff1         #  and make it binary
  42      000030
  43 0037 C6050E00 	        movb $50, buff2         # Put an ASCII 2 in the buffer
  43      000032
  44 003e 80050E00 	        addb $-48, buff2        #  and make it binary
  44      0000D0
  45 0045 31C0     	        xor %eax, %eax          # Clear all 32 bits of the acumulator
  46 0047 02050000 	        addb buff, %eax         # Add the first binary number
  46      0000
  47 004d 02050700 	        addb buff1, %eax        # Add the first binary number
  47      0000
  48 0053 02050E00 	        addb buff2, %eax        # Add the second binary number
  48      0000
  49 0059 80050000 	        addb $'0', buff         # Make first number ASCII
  49      000030
  50 0060 80050700 	        addb $'0', buff1        # Make first number ASCII
  50      000030
  51 0067 80050E00 	        addb $'0', buff2        # Make second number ASCII
  51      000030
  52 006e 0430     	        addb $'0', %eax         # Make the result ASCII
  53 0070 88051700 	        movb %eax, buff3        # Save result in the buffer
  53      0000
  54 0076 6A1A     	        pushl $26               # Do
  55 0078 68000000 	        pushl $buff             #  write
  55      00
  56 007d 6A01     	        pushl $1                #   system
  57 007f E8FCFFFF 	        call write              #    service
  57      FF
  58 0084 83C40C   	        addl $12,%esp           #  and reset stack pointer
  59              	.L1:
  60 0087 C9       		leave
  61 0088 C3       		ret
  62              	.Lfe1:
  63              		.size	 main,.Lfe1-main
  64              		.ident	"GCC: (GNU) egcs-2.91.66 19990314/Linux (egcs-1.1.2 release)"
GAS LISTING ac.s 			page 3


DEFINED SYMBOLS
                            *ABS*:00000000 add2.s
                ac.s:3      .text:00000000 gcc2_compiled.
                ac.s:9      .data:00000000 buff
                ac.s:12     .data:00000007 buff1
                ac.s:15     .data:0000000e buff2
                ac.s:18     .data:00000017 buff3
                ac.s:27     .text:00000000 main

UNDEFINED SYMBOLS
write