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| author | mo khan <mo@mokhan.ca> | 2025-01-23 10:57:09 -0700 |
|---|---|---|
| committer | mo khan <mo@mokhan.ca> | 2025-01-23 10:57:09 -0700 |
| commit | 99c88ec429f73b614ece45b45ee482c8f9f8e059 (patch) | |
| tree | 2d6b3c95e53d0505617070a71d00496f30c7c48b | |
| parent | 7031e53d352b3b8cb7e9e403a48818ff585b6bc2 (diff) | |
learn assembly
| -rw-r--r-- | assignments/3/.gitignore | 2 | ||||
| -rw-r--r-- | assignments/3/Makefile | 5 | ||||
| -rw-r--r-- | assignments/3/max_min.s | 17 |
3 files changed, 24 insertions, 0 deletions
diff --git a/assignments/3/.gitignore b/assignments/3/.gitignore new file mode 100644 index 0000000..25a7384 --- /dev/null +++ b/assignments/3/.gitignore @@ -0,0 +1,2 @@ +*.o +*.exe diff --git a/assignments/3/Makefile b/assignments/3/Makefile index 8c3bc0c..75f6584 100644 --- a/assignments/3/Makefile +++ b/assignments/3/Makefile @@ -11,3 +11,8 @@ numbers.txt: run: main.exe numbers.txt ./main.exe < numbers.txt + +manual: max_min.s + as --64 -o max_min.o max_min.s + ld -o max_min.exe max_min.o + ./max_min.exe diff --git a/assignments/3/max_min.s b/assignments/3/max_min.s new file mode 100644 index 0000000..7e7895c --- /dev/null +++ b/assignments/3/max_min.s @@ -0,0 +1,17 @@ + .global _start + + .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 + + # 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" |