passing command line parameters mips

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passing command line parameters mips

 
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  #1
Oct 28th, 2009
I have written a program that multiplies 2 decimals. My multiplication output is fine.

However I would like to do multiplication by passing in two parameters via command line. So far e.g. lets say if I just put '3 4' in the command line without the quotes.. nothing happens...

however if I put the numbers like this 'mult 3 4' -- of course without quote.. its works.. I see 12 on the console... is there anyway where I dont have to type in mult and just type '3 '4' ???

ideas???
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  #2
Oct 28th, 2009
code?

Are you trapping for a keyword mult?

How about trapping for operators

3 * 4
12
1 + 2
3
etc.

Or even
* 3 4
12
Last edited by wildgoose; Oct 28th, 2009 at 11:14 pm.
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  #3
Oct 28th, 2009
examples always help. thanks
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  #4
Oct 28th, 2009
meaning i can use an example..
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  #5
Oct 28th, 2009
Can't do that, you don't have code!
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  #6
Oct 29th, 2009
here is the code...

Assembly Syntax (Toggle Plain Text) 
  1. .data
  2.  
  3. errmsg:
  4. 	.asciiz "Two command line arguments required.\n"
  5. newline:
  6. 	.asciiz "\n"
  7. result:
  8. 	.space 11
  9.  
  10. .text
  11. .globl main
  12.  
  13. main:
  14. 	move $s0, $a0
  15. 	move $s1, $a1
  16. 	move $s2, $zero
  17. 	move $s3, $zero
  18. 	move $s4, $zero
  19.  
  20. 	# check if two arguments are given
  21. 	li $t0, 2
  22. 	ble $a0, $t0, error
  23.  
  24. 	# parse the first number
  25. 	lw $a0, 4($s1)
  26. 	jal atoi
  27. 	move $s2, $v0
  28.  
  29. 	# parse the second number
  30. 	lw $a0, 8($s1)
  31. 	jal atoi
  32. 	move $s3, $v0
  33.  
  34. 	# multiply the numbers
  35. 	mult $s2, $s3
  36. 	mflo $s4
  37.  
  38. 	# format the result
  39. 	la $a0, result
  40. 	move $a1, $s4
  41. 	jal itoa
  42.  
  43. 	# print the result
  44. 	li $v0, 4
  45. 	la $a0, result
  46. 	syscall
  47. 	li $v0, 4
  48. 	la $a0, newline
  49. 	syscall
  50.  
  51. 	b exit
  52. error:
  53. 	# print error message
  54. 	li $v0, 4
  55. 	la $a0, errmsg
  56. 	syscall
  57. exit:
  58. 	li $v0, 10
  59. 	li $a0, 0
  60. 	syscall
  61.  
  62. atoi:
  63. 	move $v0, $zero
  64.  
  65. 	# detect sign
  66. 	li $t0, 1
  67. 	lbu $t1, 0($a0)
  68. 	bne $t1, 45, digit
  69. 	li $t0, -1
  70. 	addu $a0, $a0, 1
  71. digit:
  72. 	# read character
  73. 	lbu $t1, 0($a0)
  74.  
  75. 	# finish when non-digit encountered
  76. 	bltu $t1, 48, finish
  77. 	bgtu $t1, 57, finish
  78.  
  79. 	# translate character into digit
  80. 	subu $t1, $t1, 48
  81.  
  82. 	# multiply the accumulator by ten
  83. 	li $t2, 10
  84. 	mult $v0, $t2
  85. 	mflo $v0
  86.  
  87. 	# add digit to the accumulator
  88. 	add $v0, $v0, $t1
  89.  
  90. 	# next character
  91. 	addu $a0, $a0, 1
  92. 	b digit
  93. finish:
  94. 	mult $v0, $t0
  95. 	mflo $v0
  96. 	jr $ra
  97.  
  98. itoa:
  99. 	subu $sp, $sp, 40
  100. 	sd $s0, 0($sp)
  101. 	sd $s2, 8($sp)
  102. 	sd $s4, 16($sp)
  103. 	sd $s6, 24($sp)
  104. 	sw $ra, 32($sp)
  105.  
  106. 	move $s0, $a0
  107. 	move $s1, $a1
  108.  
  109. 	# print minus if the number is negative
  110. 	bgez $s1, char
  111. 	li $t0, 45
  112. 	sb $t0, 0($s0)
  113. 	addu $s0, $s0, 1
  114. 	addu $a0, $a0, 1
  115.  
  116. 	# make the number positive
  117. 	li $t0, -1
  118. 	mult $s1, $t0
  119. 	mflo $s1
  120. char:
  121. 	# divide number by ten
  122. 	li $t0, 10
  123. 	divu $s1, $t0
  124. 	mflo $s1
  125. 	mfhi $t0
  126.  
  127. 	# translate digit to character
  128. 	addu $t0, $t0, 48
  129.  
  130. 	# write character
  131. 	sb $t0, 0($a0)
  132.  
  133. 	# finish if quotient is zero
  134. 	beqz $s1, return
  135.  
  136. 	# move to the next position
  137. 	addu $a0, $a0, 1
  138. 	b char
  139. return:
  140. 	# put null character to the end of the string
  141. 	move $t0, $zero
  142. 	sb $t0, 1($a0)
  143.  
  144. 	# reverse the string with the digits 
  145. 	move $a0, $s0
  146. 	jal reverse
  147.  
  148. 	ld $s0, 0($sp)
  149. 	ld $s2, 8($sp)
  150. 	ld $s4, 16($sp)
  151. 	ld $s6, 24($sp)
  152. 	lw $ra, 32($sp)
  153. 	addu $sp, $sp, 40
  154. 	jr $ra
  155.  
  156. reverse:
  157. 	# find the last character in the string
  158. 	move $t0, $a0
  159. next:
  160. 	lbu $t1, 0($t0)
  161. 	beqz $t1, last
  162. 	addu $t0, $t0, 1
  163. 	b next
  164. last:
  165. 	# move to the last character
  166. 	subu $t0, $t0, 1
  167. swap:
  168. 	# done when pointers meet
  169. 	bgeu $a0, $t0, done
  170.  
  171. 	# exchange characters
  172. 	lbu $t2, 0($a0)
  173. 	lbu $t3, 0($t0)
  174. 	sb $t2, 0($t0)
  175. 	sb $t3, 0($a0)
  176.  
  177. 	# step to the next pair
  178. 	addu $a0, $a0, 1
  179. 	subu $t0, $t0, 1
  180. 	b swap
  181. done:
  182. 	jr $ra
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  #7
Oct 29th, 2009
here is the code...

Assembly Syntax (Toggle Plain Text) 
  1. .data
  2.  
  3. errmsg:
  4. 	.asciiz "Two command line arguments required.\n"
  5. newline:
  6. 	.asciiz "\n"
  7. result:
  8. 	.space 11
  9.  
  10. .text
  11. .globl main
  12.  
  13. main:
  14. 	move $s0, $a0
  15. 	move $s1, $a1
  16. 	move $s2, $zero
  17. 	move $s3, $zero
  18. 	move $s4, $zero
  19.  
  20. 	# check if two arguments are given
  21. 	li $t0, 2
  22. 	ble $a0, $t0, error
  23.  
  24. 	# parse the first number
  25. 	lw $a0, 4($s1)
  26. 	jal atoi
  27. 	move $s2, $v0
  28.  
  29. 	# parse the second number
  30. 	lw $a0, 8($s1)
  31. 	jal atoi
  32. 	move $s3, $v0
  33.  
  34. 	# multiply the numbers
  35. 	mult $s2, $s3
  36. 	mflo $s4
  37.  
  38. 	# format the result
  39. 	la $a0, result
  40. 	move $a1, $s4
  41. 	jal itoa
  42.  
  43. 	# print the result
  44. 	li $v0, 4
  45. 	la $a0, result
  46. 	syscall
  47. 	li $v0, 4
  48. 	la $a0, newline
  49. 	syscall
  50.  
  51. 	b exit
  52. error:
  53. 	# print error message
  54. 	li $v0, 4
  55. 	la $a0, errmsg
  56. 	syscall
  57. exit:
  58. 	li $v0, 10
  59. 	li $a0, 0
  60. 	syscall
  61.  
  62. atoi:
  63. 	move $v0, $zero
  64.  
  65. 	# detect sign
  66. 	li $t0, 1
  67. 	lbu $t1, 0($a0)
  68. 	bne $t1, 45, digit
  69. 	li $t0, -1
  70. 	addu $a0, $a0, 1
  71. digit:
  72. 	# read character
  73. 	lbu $t1, 0($a0)
  74.  
  75. 	# finish when non-digit encountered
  76. 	bltu $t1, 48, finish
  77. 	bgtu $t1, 57, finish
  78.  
  79. 	# translate character into digit
  80. 	subu $t1, $t1, 48
  81.  
  82. 	# multiply the accumulator by ten
  83. 	li $t2, 10
  84. 	mult $v0, $t2
  85. 	mflo $v0
  86.  
  87. 	# add digit to the accumulator
  88. 	add $v0, $v0, $t1
  89.  
  90. 	# next character
  91. 	addu $a0, $a0, 1
  92. 	b digit
  93. finish:
  94. 	mult $v0, $t0
  95. 	mflo $v0
  96. 	jr $ra
  97.  
  98. itoa:
  99. 	subu $sp, $sp, 40
  100. 	sd $s0, 0($sp)
  101. 	sd $s2, 8($sp)
  102. 	sd $s4, 16($sp)
  103. 	sd $s6, 24($sp)
  104. 	sw $ra, 32($sp)
  105.  
  106. 	move $s0, $a0
  107. 	move $s1, $a1
  108.  
  109. 	# print minus if the number is negative
  110. 	bgez $s1, char
  111. 	li $t0, 45
  112. 	sb $t0, 0($s0)
  113. 	addu $s0, $s0, 1
  114. 	addu $a0, $a0, 1
  115.  
  116. 	# make the number positive
  117. 	li $t0, -1
  118. 	mult $s1, $t0
  119. 	mflo $s1
  120. char:
  121. 	# divide number by ten
  122. 	li $t0, 10
  123. 	divu $s1, $t0
  124. 	mflo $s1
  125. 	mfhi $t0
  126.  
  127. 	# translate digit to character
  128. 	addu $t0, $t0, 48
  129.  
  130. 	# write character
  131. 	sb $t0, 0($a0)
  132.  
  133. 	# finish if quotient is zero
  134. 	beqz $s1, return
  135.  
  136. 	# move to the next position
  137. 	addu $a0, $a0, 1
  138. 	b char
  139. return:
  140. 	# put null character to the end of the string
  141. 	move $t0, $zero
  142. 	sb $t0, 1($a0)
  143.  
  144. 	# reverse the string with the digits 
  145. 	move $a0, $s0
  146. 	jal reverse
  147.  
  148. 	ld $s0, 0($sp)
  149. 	ld $s2, 8($sp)
  150. 	ld $s4, 16($sp)
  151. 	ld $s6, 24($sp)
  152. 	lw $ra, 32($sp)
  153. 	addu $sp, $sp, 40
  154. 	jr $ra
  155.  
  156. reverse:
  157. 	# find the last character in the string
  158. 	move $t0, $a0
  159. next:
  160. 	lbu $t1, 0($t0)
  161. 	beqz $t1, last
  162. 	addu $t0, $t0, 1
  163. 	b next
  164. last:
  165. 	# move to the last character
  166. 	subu $t0, $t0, 1
  167. swap:
  168. 	# done when pointers meet
  169. 	bgeu $a0, $t0, done
  170.  
  171. 	# exchange characters
  172. 	lbu $t2, 0($a0)
  173. 	lbu $t3, 0($t0)
  174. 	sb $t2, 0($t0)
  175. 	sb $t3, 0($a0)
  176.  
  177. 	# step to the next pair
  178. 	addu $a0, $a0, 1
  179. 	subu $t0, $t0, 1
  180. 	b swap
  181. done:
  182. 	jr $ra
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  #8
Oct 29th, 2009
Command line Arguments are typically passed in one of two ways to a program at startup.

int count count of arguments
char *argv[] array of arguments

This seems to be the way you're handling it, and your code seems okay.
An alternate method is a single string where arguments have to be parsed but you aren't setup that way. You can be because your AtoI function tracks where the number ended and a non-digit continues.

This is assembly code, I am recommending much more commenting then you are doing!
For example:
Asm Syntax (Toggle Plain Text) 
  1. #	_________________
  2. #	ASCIIz to signed integer
  3. #
  4. #	(int) v0 = atoi( char * a0 )
  5.  
  6. atoi:
  7. 	move $v0, $zero
  8.  
  9. 	 	# detect sign
  10. 	li $t0, 1
  11. 	lbu $t1, 0($a0)
  12. 	bne $t1, 45, digit		# (C <> '-')
  13.  
  14. 		# NEGATIVE 
  15. 	li $t0, -1
  16. 	addu $a0, $a0, 1
  17.  
  18. digit:
  19. 		# read character
  20. 	lbu $t1, 0($a0)
  21.  
  22. 	 	# finish when non-digit encountered
  23. 	bltu $t1, 48, finish	# (C < '0')
  24. 	bgtu $t1, 57, finish	# (C > '9')
  25.  
  26. 	 	# translate character into digit
  27. 	subu $t1, $t1, 48		# C -= '0'
  28.  
  29. 	 	# multiply the accumulator by ten
  30. 	li $t2, 10
  31. 	mult $v0, $t2
  32. 	mflo $v0				# v0 = Lo result
  33.  
  34. 	 	# add digit to the accumulator
  35. 	add $v0, $v0, $t1		# N = (N * 10) + A
  36.  
  37. 	 	# next character
  38. 	addu $a0, $a0, 1		# advance pointer
  39. 	b digit
  40.  
  41. 		# handle sign
  42. finish:
  43. 	mult $v0, $t0			# N *= { 1 : -1 }
  44. 	mflo $v0
  45. 	jr $ra
Last edited by wildgoose; Oct 29th, 2009 at 2:41 pm.
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