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131 lines
5.8 KiB
Markdown
131 lines
5.8 KiB
Markdown
[< back to index](../index.md)
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## Adding a custom platform
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Every platform is defined in an `.ini` file with an appropriate name.
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#### `[compilation]` section
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* `arch` – CPU architecture. It defines which instructions are available. Available values:
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* `nmos` (original 6502)
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* `strict` (NMOS without illegal instructions)
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* `ricoh` (Ricoh 2A03/2A07, NMOS without decimal mode)
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* `strictricoh` (Ricoh 2A03/2A07 without illegal instructions)
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* `cmos` (WDC 65C02 or 65SC02)
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* `65ce02` (CSG 65CE02; experimental)
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* `huc6280` (Hudson HuC6280; experimental)
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* `65816` (WDC 65816/65802; experimental; currently only programs that use only 16-bit addressing are supported)
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* `z80` (Zilog Z80; experimental and very incomplete)
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* `encoding` – default encoding for console I/O, one of
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`ascii`, `pet`/`petscii`, `petscr`/`cbmscr`, `atascii`, `bbc`, `jis`/`jisx`, `apple2`,
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`iso_de`, `iso_no`/`iso_dk`, `iso_se`/`iso_fi`, `iso_yu`. Default: `ascii`
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* `screen_encoding` – default encoding for screencodes (literals with encoding specified as `scr`).
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Default: the same as `encoding`.
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* `modules` – comma-separated list of modules that will be automatically imported
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* other compilation options (they can be overridden using commandline options):
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* `emit_illegals` – whether the compiler should emit illegal instructions, default `false`
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* `emit_cmos` – whether the compiler should emit CMOS instructions, default is `true` on compatible processors and `false` elsewhere
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* `emit_65816` – which 65816 instructions should the compiler emit, either `no`, `emulation` or `native`
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* `decimal_mode` – whether the compiler should emit decimal instructions, default is `false` on `ricoh` and `strictricoh` and `true` elsewhere
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* `ro_arrays` – whether the compiler should warn upon array writes, default is `false`
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* `prevent_jmp_indirect_bug` – whether the compiler should try to avoid the indirect JMP bug,
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default is `false` on 65C02-compatible or non-6502 processors and `true` elsewhere
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* `compact_dispatch_params` – whether parameter values in return dispatch statements may overlap other objects, default is `true`
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This may cause problems if the parameter table is stored next to a hardware register that has side effects when reading.
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* `lunix` – generate relocatable code for LUnix/LNG, default is `false`
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* `zeropage_register` – reserve 2 bytes of zero page as a pseudoregister to increase language features.
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Default: `true` if targeting a 6502-based architecture, `false` otherwise.
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* `inline` - inline functions automatically by default, default is `false`.
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* `ipo` - enable interprocedural optimization, default is `false`.
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* `lenient_encoding` - allow for automatic substitution of invalid characters in string literals using the default encodings, default is `false`.
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#### `[allocation]` section
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* `zp_pointers` –
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either a list of comma separated zeropage addresses that can be used by the program as zeropage pointers, or `all` for all.
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Each value should be the address of the first of two free bytes in the zeropage.
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Only used for 6502-based targets.
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* `segments` – a comma-separated list of segment names.
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A segment named `default` is always required.
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Default: `default`. In all options below, `NAME` refers to a segment name.
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* `default_code_segment` – the default segment for code and initialized arrays.
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Note that the default segment for uninitialized arrays and variables is always `default`.
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Default: `default`
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* `segment_NAME_start` – the first address used for automatic allocation in the segment.
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Note that the `default` segment shouldn't start before $200, as the $0-$1FF range is reserved for the zeropage and the stack.
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The `main` function will be placed as close to the beginning of its segment as possible, but not necessarily at `segment_NAME_start`
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* `segment_NAME_end` – the last address in the segment
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* `segment_NAME_codeend` – the last address in the segment for code and initialized arrays.
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Only uninitialized variables are allowed between `segment_NAME_codeend` and `segment_NAME_end`.
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Default: the same as `segment_NAME_end`.
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* `segment_NAME_datastart` – the first address used for non-zeropage variables, or `after_code` if the variables should be allocated after the code.
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Default: `after_code`.
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#### `[output]` section
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* `style` – how multi-segment programs should be output:
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* `single` – output a single file, based mostly, but not necessarily only on data in the `default` segment (the default)
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* `lunix` – like `single`, but add data necessary for relocation between code and data (requires `lunix` option in the `compilation` section)
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* `per_segment` – generate a separate file with each segment
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* `format` – output file format; a comma-separated list of tokens:
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* literal byte values
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* `startaddr` – little-endian 16-bit address of the first used byte of the compiled output (not necessarily the segment start)
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* `startpage` – the high byte of `startaddr`
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* `endaddr` – little-endian 16-bit address of the last used byte of the compiled output (usually not the segment end)
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* `allocated` – all used bytes
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* `pagecount` – the number of pages used by all used bytes (including partially filled pages)
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* `<addr>:<addr>` - inclusive range of bytes
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* `<segment>:<addr>:<addr>` - inclusive range of bytes in a given segment
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* `d88` - a D88 floppy disk image for PC-88
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* `tap` - a tape disk image for ZX Spectrum
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* `extension` – target file extension, with or without the dot
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* `bbc_inf` – should the `.inf` file with file metadata for BBC Micro be created
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