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Language ASM-x86
(AT&T-Syntax)
| Date: | 07/11/09 |
| Author: | Joel Stein |
| URL: | n/a |
| Comments: | 0 |
| Info: | http://en.wikibooks.org/wiki/X86_Assembly/GAS_Syntax |
| Score: |  (3.37 in 16 votes) |
/************************************************************************** * AT&T-x86-Assembly version of the song "99 bottles of beer on the wall" * No macros, no external functions * Tested with GNU assembler (GNU Binutils for Debian) 2.19.1 * Compile with: as -o bottles.o bottles.s; ld -o bottles.x bottles.o * Author: Joel Stein **************************************************************************/ .text int_to_ascii: # convert int to ascii and print .global int_to_ascii pushl %ebp # save ebp movl %esp,%ebp # esp --> ebp subl $12,%esp # space for string pushal # save regs movl 8(%ebp),%eax # get value from stack movl $10,%esi # divisor movl %ebp,%ecx # reg for indirect addressing NON_ZERO: decl %ecx # ecx -1 --> ecx movl $0,%edx # for division divl %esi # eax / 10 addb $'0,%dl # rest --> ascii movb %dl,(%ecx) # save digit cmpl $0,%eax # quotient = 0? jne NON_ZERO movl %ebp,%edx # calculate lenght subl %ecx,%edx pushl %ecx # push string address to stack pushl %edx # push char count to stack call print # print string addl $8,%esp # clear stack popal # restore regs movl %ebp,%esp # free local memory popl %ebp # restore ebp ret print: # print to stdout .global print pushl %ebp # save ebp movl %esp,%ebp # esp --> ebp pushal # save regs movl 8(%ebp),%edx # get value from stack movl 12(%ebp),%ecx # get value from stack movl $4,%eax # prepare syscall movl $1,%ebx # stdout int $0x80 # syscall popal # restore regs movl %ebp,%esp # free local memory popl %ebp # restore ebp ret DEFAULT: # default case (99-2) pushl %ecx call int_to_ascii pushl $_line_1_1 pushl _line_1_1_l call print addl $8, %esp call int_to_ascii pushl $_line_1_2 pushl _line_1_2_l call print addl $8, %esp pushl $_line_2_1 pushl _line_2_1_l call print addl $8, %esp popl %eax decl %eax pushl %eax call int_to_ascii cmpl $1, %eax # if next = 1 goto ONE je ONE pushl $_line_2_2 pushl _line_2_2_l jmp DEFAULT2 ONE: # prepare for printing one-lines pushl $_line_2_2_one pushl _line_2_2_one_l DEFAULT2: # print given lines call print addl $12, %esp # clean stack loop LOOP _start: .global _start movl $99, %ecx LOOP: # Main Loop cmpl $1, %ecx # if !=1 goto default case jne DEFAULT # else print ending pushl $_ending pushl _ending_l call print addl $8,%esp jmp DONE DONE: # exit programm movl $1, %eax movl $0, %ebx int $0x80 .data _line_1_1: .ascii " bottles of beer on the wall, " _line_1_1_l: .long .-_line_1_1 _line_1_2: .ascii " bottles of beer.\n" _line_1_2_l: .long .-_line_1_2 _line_2_1: .ascii "Take one down and pass it around, " _line_2_1_l: .long .-_line_2_1 _line_2_2: .ascii " bottles of beer on the wall.\n\n" _line_2_2_l: .long .-_line_2_2 _line_2_2_one: .ascii " bottle of beer on the wall.\n\n" _line_2_2_one_l:.long .-_line_2_2_one _ending: .ascii "1 bottle of beer on the wall, 1 bottle of beer.\n" .ascii "Take one down and pass it around, no more bottles of beer on the wall.\n\n" .ascii "No more bottles of beer on the wall, no more bottles of beer.\n" .ascii "Go to the store and buy some more, 99 bottles of beer on the wall.\n" _ending_l: .long .-_ending
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