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.

13_toolchain/pragmas.md

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+[← Home](../README.md) · [Toolchain](README.md)
+
+# Compiler Pragmas and Inline Stubs
+
+## Overview
+
+AmigaOS library calls use **register-based** calling conventions (arguments in D0–D7/A0–A6). C compilers need pragmas or inline stubs to generate the correct register assignments instead of stack-based calls.
+
+---
+
+## Three Mechanisms
+
+| Method | Compiler | How it works |
+|---|---|---|
+| **Pragmas** | SAS/C | `#pragma libcall` directive |
+| **Inline headers** | GCC | Inline asm functions in `<inline/lib.h>` |
+| **Proto headers** | All | `<proto/lib.h>` — auto-selects pragma or inline |
+
+---
+
+## Pragma Example (SAS/C)
+
+```c
+#pragma libcall DOSBase Open 1e 2102
+/* Translates to: LVO = -0x1E = -30
+   Args: D1 = arg1 (name), D2 = arg2 (mode)
+   Result: D0 */
+```
+
+---
+
+## Inline Example (GCC)
+
+```c
+/* inline/exec.h */
+static __inline APTR
+AllocMem(ULONG byteSize, ULONG requirements)
+{
+    register APTR _res __asm("d0");
+    register ULONG _byteSize __asm("d0") = byteSize;
+    register ULONG _requirements __asm("d1") = requirements;
+    register struct ExecBase *_SysBase __asm("a6") = SysBase;
+    __asm volatile (
+        "jsr -198(%%a6)"
+        : "=r"(_res)
+        : "r"(_byteSize), "r"(_requirements), "r"(_SysBase)
+        : "d1","a0","a1","cc","memory"
+    );
+    return _res;
+}
+```
+
+---
+
+## Generating Pragmas/Inlines from FD Files
+
+```bash
+# fd2pragma (Aminet: dev/misc/fd2pragma.lha):
+fd2pragma exec_lib.fd exec_lib.sfd TO pragmas/exec_pragmas.h SPECIAL 6
+fd2pragma exec_lib.fd exec_lib.sfd TO inline/exec.h SPECIAL 70
+```
+
+---
+
+## Proto Headers
+
+```c
+/* proto/exec.h — portable wrapper: */
+#ifdef __SASC
+#include <pragmas/exec_pragmas.h>
+#elif defined(__GNUC__)
+#include <inline/exec.h>
+#endif
+
+extern struct ExecBase *SysBase;
+```
+
+---
+
+## References
+
+- NDK39: `pragmas/`, `inline/`, `proto/` directories
+- `13_toolchain/fd_files.md` — FD file format