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8366b8731e
* Set up build system for ntsc-1.2 * Set up disassembly for ntsc-1.2 * Add all unnamed functions to functions.txt * Update docs/retail_versions.md for ntsc-1.2 * Format * Update docs/retail_versions.md Co-authored-by: Dragorn421 <Dragorn421@users.noreply.github.com> * Remove mention of US * OOT_N64 -> PLATFORM_N64, OOT_GC -> PLATFORM_GC * Move mtxutil to libultra/gu * Fix libultra/io bss splits * Fix merge --------- Co-authored-by: Dragorn421 <Dragorn421@users.noreply.github.com>
109 lines
3.7 KiB
Markdown
109 lines
3.7 KiB
Markdown
# Decompiling retail versions
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The next decompilation target for OOT is NTSC version 1.2
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(`ntsc-1.2`), because it is the N64 version that is most similar to the GC
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versions. Unfortunately there are still a lot of differences,
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but once this version is done, future
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N64 versions should be much easier, as the changes between N64 versions are
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small in comparison.
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Instead of `cp`ing a matching build into `expected/`, the target ROM is disassembled as `.s` files then
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reassembled as `.o` files directly into `expected/build/ntsc-1.2` for diff tools.
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This allows us to make progress matching code in parallel with solving other
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problems (such as the build system, ROM organization, and BSS ordering). The
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files in `tools/disasm/ntsc-1.2` say how to split the source files and where the
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functions and variables are in the target ROM, and these may need to be updated
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if there are mistakes or if function names change due to documentation work.
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Unfortunately, the disassembly is not perfect, so a "correct" decompilation might
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still show diffs with data symbols. We might improve this later, but these data
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diffs are fine to ignore for now.
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For register and stack allocation differences, often the code can be tweaked so
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that it matches both the retail ROM while continuing to match GC versions and the Debug ROM (for
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example, by reordering assignments or moving a local variable declaration inside
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an `if` block). Since retail MM versions currently target N64, checking MM decomp for similar code can help.
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We can handle code that is different between versions by adding
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`#if PLATFORM_N64 ... #endif` or `#if PLATFORM_GC ... #endif` around these parts of the
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code. In order to keep the code readable, we should try to minimize the amount of
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`#if` noise whenever possible.
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## Setup
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1. Copy your target JP NTSC 1.2 ROM to `baseroms/ntsc-1.2/baserom.z64`
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1. Build the non-matching test ROM by running
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```sh
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make setup -jN VERSION=ntsc-1.2
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make -jN VERSION=ntsc-1.2
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```
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where `N` is the number of cores on your machine. This will build into
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`build/ntsc-1.2` and produce `build/ntsc-1.2/oot-ntsc-1.2.z64`.
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If you later want to delete all output files, run
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```sh
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make clean VERSION=ntsc-1.2
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```
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1. Disassemble the target ROM by running
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```sh
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make disasm VERSION=ntsc-1.2
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```
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The outputs will be written to `expected/build/ntsc-1.2`.
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Note that if you need to copy a matching build for another version, you can use e.g.
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```sh
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mkdir -p expected/build
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cp -r build/gc-eu-mq-dbg expected/build
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```
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to avoid clobbering the disassembly.
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## Diff Tools
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Note that many tools will require activating the Python virtual environment
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in your terminal session. To do this, run:
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```sh
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source .venv/bin/activate
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```
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### retail_progress.py
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Running `./retail_progress.py path/to/file.c` will attempt to figure out which functions
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in a file still need to match for `ntsc-1.2`. To get an overview of diffs for
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all files, run `./retail_progress.py` with no arguments.
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### asm-differ / diff.py
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To diff assembly for a single function in `ntsc-1.2`, run e.g.
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```sh
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./diff.py -mwo3 -v ntsc-1.2 Math3D_CylTriVsIntersect
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```
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The `-v` flag tells `diff.py` to compare between `build/ntsc-1.2` and
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`expected/build/ntsc-1.2`, and to use `make VERSION=ntsc-1.2` when rebuilding.
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You may also want to diff versions `gc-eu-mq` and/or `gc-eu-mq-dbg` in another terminal
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to ensure any changes still match there.
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### Permuter and decomp.me
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Disassembly for individual functions is written to
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`expected/build/ntsc-1.2/functions`, so to get a [decomp.me](https://decomp.me/) scratch you can run
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e.g.
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```sh
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decomp-permuter/import.py \
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src/code/sys_math3d.c \
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expected/build/ntsc-1.2/functions/src/code/sys_math3d/Math3D_CylTriVsIntersect.s \
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VERSION=ntsc-1.2 --decompme
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```
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