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| -rw-r--r-- | subx/Readme.md | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/subx/Readme.md b/subx/Readme.md index 404f4dc6..f95be08b 100644 --- a/subx/Readme.md +++ b/subx/Readme.md @@ -294,10 +294,14 @@ You can reuse segment names: ``` The code segment now contains the instructions of `A` as well as `C`. `C` -comes _before_ `A`. This order allows me to split SubX programs between -multiple _layers_. A program built with just layer 1 would start executing at -layer 1's first instruction, while one built with layer 1 and layer 2 (in that -order) would start executing at layer 2's first instruction. +comes _before_ `A`. (Why this order? I'd like to organize SubX programs into +sequences of [_layers_](http://akkartik.name/post/wart-layers) that permit +incrementally building a subset of layers into a working program with a subset +of functionality. This organization requires, among other things, letting each +layer control the code that runs when the binary starts up. Letting each layer +override the starting address would require additional syntax. Instead, I +choose to always begin execution at the start of the code segment, but allow +layers to prepend to segments.) Within the code segment, each line contains a comment, label or instruction. Comments start with a `#` and are ignored. Labels should always be the first |