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Asmtut 6: Live interaction
This was originally posted on Google+, which has now been shut down. It was helpfully converted to Markdown by Robert Jacobson after which I adjusted it for reposting here. I have dated it at its original posting date, but it was posted here on 2019-09-07. Since the last time, the nasm people have been able to fix the bugs I stumbled upon, and pushed them in a release. Anything newer than 2.10.6 is probably also fine. Please note that you have to update if you are following this tutorial on OS … Continue reading
Asmtut 5: More snappy interaction
This was originally posted on Google+, which has now been shut down. It was helpfully converted to Markdown by Robert Jacobson after which I adjusted it for reposting here. I have dated it at its original posting date, but it was posted here on 2019-09-07. At this point, we are tired of the line-buffered interface. Let's make it more responsive! Step 11: Cleanup First, let's just clean up our code a bit by putting our constants on top: ; System defines: SYS_write equ 0x02000004 SYS_read … Continue reading
Asmtut 4: Input
This was originally posted on Google+, which has now been shut down. It was helpfully converted to Markdown by Robert Jacobson after which I adjusted it for reposting here. I have dated it at its original posting date, but it was posted here on 2019-09-07. Let's start drawing and moving around a snake. Before we can ask the user where he wants to move the snake, we need to have a snake: Step 9: Writing into an array Our board is basically a char[] in C lingo, even though it doesn't have a type.… Continue reading
Asmtut 3: Redundancies
This was originally posted on Google+, which has now been shut down. It was helpfully converted to Markdown by Robert Jacobson after which I adjusted it for reposting here. I have dated it at its original posting date, but it was posted here on 2019-09-07. This time we will automate stuff with the assembler. Step 6: String length In our Hello world-implementation, we used a tedious and error prone mechanism to measure the length of the string: counting by brain. Let's offload that to the comput… Continue reading
Asmtut 2: Hello world!
This was originally posted on Google+, which has now been shut down. It was helpfully converted to Markdown by Robert Jacobson after which I adjusted it for reposting here. I have dated it at its original posting date, but it was posted here on 2019-09-07. Aside: For your convenience, please use a Makefile. To assemble and link, simply execute make. # Please be aware that the indentation must be a tab character (no spaces) all: hello true %: %.o ld -macosx_version_min 10.6 -o $@ -e main $<… Continue reading