Ilia Sharin
0aafceb31e
More information. Especially about RE and AREXX automation
2026-04-29 21:42:28 -04:00
Ilia Sharin
8133b3a6cb
More content added
2026-04-26 14:46:18 -04:00
Ilia Sharin
aeaea88d75
03/exe_crunchers: expand architecture with full decrunch lifecycle
...
Replaced the brief 'key insight' paragraph with a comprehensive
two-phase execution model covering:
- Phase 1 (OS): what LoadSeg sees, how wrapper relocations are applied
- Phase 2 (stub): all 6 reconstruction steps with code examples:
1. Metadata block preserving original hunk count/sizes/memflags
2. Chip vs Fast RAM allocation (with IMPORTANT warning about
DMA-invisible Fast RAM for bitmap/audio data)
3. Decompression into separately allocated hunks
4. Relocation regeneration from embedded tables
5. BPTR segment chain construction (with C code)
6. Wrapper cleanup and JMP to original entry
- The segment list handoff problem (double-free hazard) and the
three solutions: pr_SegList patching, chain linking, in-place
2026-04-23 18:50:46 -04:00
Ilia Sharin
4593ff135a
03: new article — exe_crunchers.md (executable packers deep dive)
...
New comprehensive article on Amiga executable crunchers covering:
- Architecture: how crunched files remain valid HUNK executables
- Major crunchers: PowerPacker, Imploder, Shrinkler, ByteKiller,
Titanics, CrunchMania, PackFire, XPK framework
- PP20 format: efficiency table, decrunch info, decrunch colours
- Shrinkler internals: 1536-context adaptive probability model,
range coder, parity context flag, stack-based context table,
actual 68000 decompressor source from GitHub
- LZ77/LZSS vs context-modelling+range-coding algorithms
- Relocation handling: 3 strategies (compressed relocs, delta
table, merged single-hunk)
- Memory layout diagrams: before/during/after decompression
- Detection: magic signatures table, fake header warning,
Python scanner script
- Tools: xfdmaster modular architecture, Ancient C++ library,
debugger-based extraction (last resort)
- FPGA/emulation impact: timing, self-modifying code, cache
Based on web research: verified PP20 format spec, Shrinkler
source (askeksa/Shrinkler), Ancient library (temisu/ancient),
xfdmaster slave module architecture.
Updated indexes: 03/README.md, root README.md
2026-04-23 18:41:07 -04:00
Ilia Sharin
7df1f11f15
03/04: deep enrichment of loader/exec format and linking/libraries
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Sections 03 and 04 augmented to bootcamp quality with targeted
enrichment based on content analysis (not just file size).
03_loader_and_exec_format:
- overlay_system.md: full rewrite — tree architecture diagram,
HUNK_OVERLAY binary format, overlay manager runtime internals,
worked binary example, linker support, modern alternatives
- hunk_relocation.md: full rewrite — visual before/after diagram,
patching algorithm with code, RELOC32SHORT and DREL32 formats,
PC-relative impact comparison table, self-referencing relocs,
error scenarios, Python reloc scanner tool
04_linking_and_libraries:
- library_structure.md: full rewrite — ASCII memory layout diagram,
JMP table encoding (why 6 bytes), MakeLibrary internals with both
function array formats, complete library creation example with
.fd file, checksum verification, lifecycle state diagram
- shared_libraries_runtime.md: full rewrite — OpenLibrary 4-step
resolution path, ramlib disk loader internals, disk search path,
version negotiation table (v33-v47), CloseLibrary/Expunge deep
dive, memory-low sweep, common pitfalls table
- register_conventions.md: full rewrite — FPU register map,
inter-library A6 save/restore pattern, small-data model with
__saveds keyword, varargs/TagItem pattern deep dive,
stack-based wrapper explanation, disassembly identification
Updated indexes:
- 03_loader_and_exec_format/README.md
- 04_linking_and_libraries/README.md
- Root README.md (sections 03 and 04)
2026-04-23 18:30:45 -04:00
Ilia Sharin
fca930d0db
docs(amiga): make cross-references clickable markdown links
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Convert bare .md path references in 29 files to proper [name](relative/path)
markdown links for GitHub navigation.
2026-04-23 12:24:21 -04:00
Ilia Sharin
21751c0025
docs(amiga): complete AmigaOS 3.1/3.2 developer reference — 172 files across 17 sections
...
Comprehensive technical documentation covering:
- Hardware: OCS/ECS/AGA custom chip registers, Copper & Blitter deep dives
- Boot sequence: cold boot through startup-sequence
- Binary format: HUNK executable spec, relocation, debug info
- Linking & ABI: .fd files, LVO tables, register calling conventions
- Exec kernel: tasks, interrupts, memory, signals, semaphores
- AmigaDOS: file I/O, FFS/OFS layout, CLI/Shell scripting
- Graphics: planar bitmaps, Copper programming, HAM/EHB modes
- Intuition: screens, windows, IDCMP, BOOPSI
- Devices: trackdisk, SCSI, serial, timer, audio, keyboard
- Libraries: utility, expansion, IFFParse, locale, ARexx
- Networking: bsdsocket API, SANA-II, TCP/IP stack comparison
- Toolchain: GCC, vasm/vlink, SAS/C, NDK, debugging
- Reverse engineering: IDA/Ghidra setup, compiler fingerprints, case studies
- CPU & MMU: 68040/060 emulation libs, PMMU, cache management
- Driver development: SANA-II, Picasso96/RTG, AHI audio
All files include breadcrumb navigation. No local paths or proprietary content.
2026-04-23 12:17:35 -04:00
