diff options
| -rw-r--r-- | assignments/3/max_min.s | 44 |
1 files changed, 30 insertions, 14 deletions
diff --git a/assignments/3/max_min.s b/assignments/3/max_min.s index 7e7895c..1c0e84a 100644 --- a/assignments/3/max_min.s +++ b/assignments/3/max_min.s @@ -1,17 +1,33 @@ - .global _start + .global _start - .text + .text _start: - # write(1, message, 13) - mov $1, %rax # system call 1 is write - mov $1, %rdi # file handle 1 is stdout - mov $message, %rsi # address of string to output - mov $13, %rdx # number of bytes - syscall # invoke operating system to do the write + # write(1, message, 13) + mov $1, %rax # system call 1 is write + mov $1, %rdi # file handle 1 is stdout + mov $message, %rsi # address of string to output + mov $13, %rdx # number of bytes + syscall # invoke operating system to do the write - # exit(0) - mov $60, %rax # system call 60 is exit - xor %rdi, %rdi # we want return code 0 - syscall # invoke operating system to exit -message: - .ascii "Hello, world\n" + # read(0, input, 3) + mov $0, %rax # system call 0 is read + mov $0, %rdi # file handle 0 is stdin + mov $input, %rsi # address of var to input + mov $4, %rdx # number of bytes + syscall # invoke operating system to do the write + + # write(1, input, 4) + mov $1, %rax # system call 1 is write + mov $1, %rdi # file handle 1 is stdout + mov $input, %rsi # address of string to output + mov $4, %rdx # number of bytes + syscall # invoke operating system to do the write + + # exit(0) + mov $60, %rax # system call 60 is exit + xor %rdi, %rdi # we want return code 0 + syscall # invoke operating system to exit + + .data +message: .ascii "Hello, world\n" +input: .word 0 |