diff options
Diffstat (limited to 'assembler')
| -rw-r--r-- | assembler/gcd-x86_64-linux.s | 23 |
1 files changed, 11 insertions, 12 deletions
diff --git a/assembler/gcd-x86_64-linux.s b/assembler/gcd-x86_64-linux.s index cc85933..ad92477 100644 --- a/assembler/gcd-x86_64-linux.s +++ b/assembler/gcd-x86_64-linux.s @@ -43,27 +43,26 @@ gcd2_exit: # uses: rax, rbx, rcx, rdx, rdi, buffer print: mov $10, %rcx # set %rcx = 10 (radix) - mov $buf_end, %rdi + mov $buf_end, %rsi next_digit: xor %rdx, %rdx # set %rdx = 0 div %rcx # divide: %rdx:%rax / %rcx, actually: %rax / %rcx # %rdx is a remainder (0-9), it fits into %dl add $48, %dl # get ASCII code: 0 => 48 = '0', 1 => 49 = '1' - dec %rdi # put remainders going from the end of the buffer - mov %dl, (%rdi) + dec %rsi # put remainders going from the end of the buffer + mov %dl, (%rsi) # now rax is a quotient and %rax, %rax # is quotient == 0 ? jnz next_digit # quotient is not 0, go on - + # printing the number: - mov $4, %rax # syscall `write' - mov $1, %rbx # write to stdout - mov %rdi, %rcx # first character to write + mov $1, %rax # syscall `write' + mov $1, %rdi # write to stdout mov $buf_end, %rdx - sub %rdi, %rdx # rdx is a number of characters to write (buf_end - rdi) + sub %rsi, %rdx # rdx is a number of characters to write (buf_end - rsi) inc %rdx # + new line - int $0x80 # do syscall (print the number) + syscall # do syscall (print the number at rsi) ret @@ -121,7 +120,7 @@ gcd_loop: call print # print rax with GCD exit: - mov $1, %rax # exit syscall - xor %rbx, %rbx # exit code = 0 - int $0x80 + mov $60, %rax # exit syscall + xor %rdi, %rdi # exit code = 0 + syscall |