this is an exercies i set out to do in order to familiarise my self with
linux and AT&T
assembly syntax.
i worked a lot and read a lot before figureing out how each operator
gets its paramaters and such...
the code doesn't compile with the following errors:
# as -gstabs sieve.s -o sieve.o
# gcc sieve.o -o sieve
sieve.o(.text+0x1):sieve.s:20: relocation truncated to fit: R_386_8 .data
sieve.o(.text+0xc):sieve.s:24: relocation truncated to fit: R_386_16 .data
sieve.o(.text+0x19):sieve.s:32: relocation truncated to fit: R_386_8 .data
sieve.o(.text+0x1b):sieve.s:33: relocation truncated to fit: R_386_8 .data
sieve.o(.text+0x2d):sieve.s:43: relocation truncated to fit: R_386_8 .data
sieve.o(.text+0x39):sieve.s:50: relocation truncated to fit: R_386_8 .data
collect2: ld returned 1 exit status
the source code is:
# assembly code for the calculation of the primes numbers in the range of
[2-100]
# the code brute forces the numbers out, no formulas are taken in consideration
*.include* "defines.h" #system call numbers are stored here (i.e.
__NR_<oper> = number)
*.global* main
*.data*
sieve:
*.byte* 4
test:
*.byte* 1
*.text*
main:
loop:
movb $test, %dl
incb %dl #increase test
movb %dl, (test)
movw $sieve, %ax #prepare for divb: move sieve in ax
divb %dl #div ax by dl
xor %cx, %cx #clear cx
movb %ah, %cl #move rest in cx
jcxz next #test if rest is 0 and increase if so
movb $sieve, %al
movb $test, %bl
cmpb %al, %bl #else test if "test" has reached sieve
jnz loop #if not go back and div by new test value
print: movl $__NR_write, %eax #else print the prime
movl $1, %ebx #STDOUT is $1
xor %ecx, %ecx
movb $sieve, %cl
addb $30, %cl #make ascii out of int
movl $16,%edx #buffer size
int $0x80
next:
movb $sieve, %cl
incb %cl #increase sieve
movb %cl, (sieve)
movb $100, %al
cmpb %al, %cl #test if limit is reached
jz exit
movb $1, %al #if not start again with a new sieve and test =
1
movb %al, (test)
jmp loop
exit: movl $0, %eax
ret
please send me any critique and advices you can, i really want to make
the complete switch from MASM to GAS as soon as possible....
cheers!
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