Don't build the kernel image for cross compiler

common.s

@@ -2,7 +2,7 @@
 # v. 2.0. If a copy of the MPL was not distributed with this file, You can
 # obtain one at https://mozilla.org/MPL/2.0/.
 
-.global write_s, write_c, write_i, _print_i
+.global write_s, write_c
 .global memcmp, memchr, memmem, memcpy
 
 .section .text
@@ -75,85 +75,6 @@ write_s:
 	addi sp, sp, 32
 	ret
 
-# Writes a number to a string buffer.
-#
-# t0 - Local buffer.
-# t1 - Constant 10.
-# t2 - Current character.
-# t3 - Whether the number is negative.
-#
-# Parameters:
-# a0 - Whole number.
-# a1 - Buffer pointer.
-#
-# Sets a0 to the length of the written number.
-.type _print_i, @function
-_print_i:
-    addi sp, sp, -32
-    sw ra, 28(sp)
-    sw s0, 24(sp)
-    addi s0, sp, 32
-
-    li t1, 10
-    addi t0, s0, -9
-
-    li t3, 0
-    bgez a0, .Lprint_i_digit10
-    li t3, 1
-    neg a0, a0
-
-.Lprint_i_digit10:
-    rem t2, a0, t1
-    addi t2, t2, '0'
-    sb t2, 0(t0)
-    div a0, a0, t1
-    addi t0, t0, -1
-    bne zero, a0, .Lprint_i_digit10
-
-    beq zero, t3, .Lprint_i_write_call
-    addi t2, zero, '-'
-    sb t2, 0(t0)
-    addi t0, t0, -1
-
-.Lprint_i_write_call:
-	mv a0, a1
-	addi a1, t0, 1
-    sub a2, s0, t0
-	addi a2, a2, -9
-	sw a2, 0(sp)
-
-	call memcpy
-
-	lw a0, 0(sp)
-
-    lw ra, 28(sp)
-    lw s0, 24(sp)
-    addi sp, sp, 32
-    ret
-
-# Writes a number to the standard output.
-#
-# Parameters:
-# a0 - Whole number.
-.type write_i, @function
-write_i:
-    addi sp, sp, -32
-    sw ra, 28(sp)
-    sw s0, 24(sp)
-    addi s0, sp, 32
-
-	addi a1, sp, 0
-	call _print_i
-
-	mv a1, a0
-	addi a0, sp, 0
-	call write_s
-
-    lw ra, 28(sp)
-    lw s0, 24(sp)
-    addi sp, sp, 32
-    ret
-
 # Prints a character from a0.
 #
 # Arguments: