rg-asm release notes

The assembler and linker for Atari ST, TT and Falcon. Newest release first.

0.7.0 — 2026-07-29

Adds GenPC dialect support — Ziggy/OVR's PC cross-assembler (Overlanders). Use --dialect=genpc for GenPC and as68 sources.

New features

• --dialect=genpc: brace {/} macros, IF/WHILE/REPEAT, @ octal, Devpac-style text/end.
• Flat binary output with --raw; optional --reloc reloc-table trailer and --strip-bss tail trim.
• LS / LST symbol-file load; .SY2 overlay values when assembling with --reloc.

Improvements

• Default --dialect restored to vasm for FASTBuild and GODLIB Motorola sources.

Bug fixes

• GenPC: SY2 overlay reloc values, WHILE/REPEAT parse depth, and sizing defaults (forward branches word-sized, unsized MOVE defaults to word).

0.6.0 — 2026-07-27

Much broader dialect coverage and byte-level checks against classic Atari assemblers. Devpac, TurboAss, MADMAC, Alcyon and several other tools now have committed goldens; --strict-dialect catches foreign syntax more reliably.

New features

• Full-syntax corpora for TurboAss and DevpacST 1.01 (STANDARD / GenST TOS programs).
• Expanded MADMAC, Alcyon AS68, Lattice, SEKA, GST-ASM and other dialect packs with host oracles.
• Dialects and smoke harnesses for additional vendored assemblers (Sozobon, Josy, Brainstorm, MWC, AssemPro, GFA).
• LLVM-flavoured GAS ingestion path and a gas-llvm corpus.
• Aztec C Mot ingestion with a self-golden DRI pin (native ST AS.TTP still not available).

Improvements

• GenST / TurboAss --prg output matches classic empty-DATA and reloc trailers more closely.
• --strict-dialect promotes foreign-syntax heuristics to hard errors across dialects.
• Rejection checklists and negatives for every dialect coverage matrix.

Bug fixes

• Fixed empty-DATA padding when text length was 2 mod 4 (vlink-style pad) for GenST-family and TurboAss programs.
• GenST 1.01 treats | as a line comment; ENDC handling matches the era.

0.5.6 — 2026-07-24

Added more vasm Mot and Pure C dialect coverage, and fixed a macro expansion crash. Building the macOS release no longer needs CoreFoundation.

New features

• Broader vasm Mot syntax: nested \@! / \@@ stacks, -allmp for args 10–35, include / offset / section, data aliases and conditionals.
• Pure C MACRO name.size sized-macro expansion, plus SET / EQU / MACRO / REPT / CPU coverage.
• Pure C object names and FIX tables closer to PASM.

Bug fixes

• Macro .size and \?0 expansion no longer panics.
• Dropped the chrono dependency so macOS cross-builds do not need CoreFoundation.

0.5.5 — 2026-07-22

Added support for additional dialects and improved the size optimiser. rg-asm now understands far more of RMAC's syntax, produces tighter code at the higher optimisation levels, and lays out Devpac-style object files more faithfully.

New features

• Much broader support for RMAC-style source, including its higher optimisation levels.
• Tighter code from the size optimiser: some absolute memory accesses become shorter PC-relative forms.
• Improved Devpac-compatible object output and listing formatting.

Bug fixes

• Fixed a false error on some forward references in indexed PC-relative addressing.
• More accurate instruction timing for immediate-to-register arithmetic.
• Corrected a few object-file layout details for better interoperability with other tools.

0.5.1 — 2026-07-20

Added a machine-readable JSON mode and an optional per-function size/timing table. Also fixed a pile of linker bugs — cases that used to emit subtly wrong programs now either work correctly or stop with a clear error.

New features

• A --json mode that prints one structured document you can feed to other tools.
• An optional --functions table showing the size and cycle cost of each function.

Bug fixes

• Fixed several linking bugs that could silently produce incorrect programs.
• Out-of-range jumps, bad relocations, and malformed flat images now stop with a clear error instead of emitting wrong bytes.

Breaking changes

• With no -o, the output file is now named after the input (main.s → main.prg) instead of always out.tos. Pass -o out.tos to keep the old name.
• The --summary options were replaced by --functions (the per-function table), -q (quiet), and --json (machine-readable).
• A few command-line flags were renamed for consistency; see the manual for the current names.
• The separate manual and man page were folded into the README that ships with the download.

0.1.0 — 2026-06-01

First public release. One self-contained assembler and linker for Atari ST and Falcon development — runs natively on Linux, macOS and Windows with nothing else to install. Free and open source (MIT or Apache-2.0).

New features

• Assembles Motorola syntax plus seven other classic assembler dialects, detected automatically per file.
• Links directly to ready-to-run Atari .TOS / .PRG programs.
• Supports the full 680x0 line (68000–68060) and ColdFire instruction sets, floating-point targets, and a size optimiser.
• Reads and writes every common Atari object-file format, so it mixes cleanly with other toolchains.

Known issues

• A handful of 68030 memory-management instructions are recognised but not yet assembled; rg-asm reports an error for them rather than risk emitting wrong code.