Chris Collins

Tools · retro

Amiga library reference

Every AmigaOS library, device, resource and BOOPSI class function from the 3.2 NDK — its LVO, registers, C prototype, and the Kickstart version that added it — with a decoder that names the jsr -nnn(a6) calls in a disassembly and generators for LVO includes, FD files and SAS/C pragmas.

Added

How to use it

  • Functions — search by name (AllocMem), by words from the description (top of the next video frame), or by offset (-198, $C6, 0xc6). Pick a library to browse it in LVO order, and limit the list to what a given Kickstart has (Up to 1.3 hides every V36+ call). Selecting a function shows which register carries each argument, the C prototype, a ready-to-paste assembler call, the _LVO equate, the SAS/C pragma, and the FD line.

  • Decode calls — paste a disassembly or assembler source. Every jsr -nnn(a6), jsr (-$nn,a6), or jsr $FFxx(a6) (positive word offsets, as some disassemblers print them) gets a comment naming the function. The library in a6 follows move.l 4.w,a6 (exec) and moves from base variables like _DOSBase or GfxBase; otherwise the library you pick is assumed. Unknown offsets list which other libraries have a function there.

  • Include files — the whole library as _LVO equates for an assembler, an FD file, SAS/C #pragma libcall lines, C `#define`s, or JSON. Download or copy.

  • Libraries — all 76 libraries, devices, resources and classes with their function counts, and the table of library versions against Kickstart releases.

Calling convention

The library base goes in a6 and the call is jsr _LVOName(a6): the LVO is a negative offset from the base to a six-byte jump instruction. Arguments go in the registers listed; the result comes back in d0. Calls may change d0, d1, a0 and a1, and preserve everything else. exec’s base is always at address 4 (move.l 4.w,a6); other bases come from OpenLibrary(), which should be given the lowest version you need.

Data

Offsets, registers, prototypes and versions are generated from the SFD files of the AmigaOS 3.2 NDK, and the one-line summaries come from the NAME line of each autodoc. The SAS/C pragmas generated here were checked against all 516 pragmas the NDK ships for exec, dos, graphics and intuition. Private functions (reserved vectors used inside the OS) are hidden unless you tick Private. Functions added after 3.1 (V40) exist only on AmigaOS 3.1.4 and 3.2 — check the Since column before using them on older systems.

Sharing

Share link copies a link to the open tab with its settings. Searches can be written by hand: ?q= (name, words, or offset), ?lib=, ?ver= (highest library version), ?priv=true, and ?sel=library/Function to pick the detail shown — for example /tools/amiga-lvo/?q=OpenLibrary. Decoded listings and include-file settings travel packed in ?s=.

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