mirror of
https://github.com/KarolS/millfork.git
synced 2024-08-17 11:29:00 +00:00
* stack variables * large comparisons * pointer optimizations * fixed constant evaluation
249 lines
12 KiB
Markdown
249 lines
12 KiB
Markdown
[< back to index](../doc_index.md)
|
||
|
||
## Adding a custom platform
|
||
|
||
Every platform is defined in an `.ini` file with an appropriate name.
|
||
The file is looked up in the directories on the include path, first directly, then in the `platform` subdirectory.
|
||
|
||
As an extension, multiline entries are supported:
|
||
if a line ends with a backslash character, the value continues to the next line.
|
||
|
||
#### `[compilation]` section
|
||
|
||
* `arch` – CPU architecture. It defines which instructions are available. Available values:
|
||
|
||
* `nmos` (original 6502)
|
||
|
||
* `strict` (NMOS without illegal instructions)
|
||
|
||
* `ricoh` (Ricoh 2A03/2A07, NMOS without decimal mode)
|
||
|
||
* `strictricoh` (Ricoh 2A03/2A07 without illegal instructions)
|
||
|
||
* `cmos` (65SC02, or any 65C02 without bit instructions)
|
||
|
||
* `65sc02` (65SC02)
|
||
|
||
* `65c02` (Rockwell 65C02)
|
||
|
||
* `w65c02` (WDC 65C02)
|
||
|
||
* `65ce02` (CSG 65CE02; experimental)
|
||
|
||
* `huc6280` (Hudson HuC6280)
|
||
|
||
* `65816` (WDC 65816/65802; experimental; currently only programs that use only 16-bit addressing are supported)
|
||
|
||
* `z80` (Zilog Z80)
|
||
|
||
* `strictz80` (Z80 without illegal instructions)
|
||
|
||
* `z80next` (Z80 core from ZX Spectrum Next)
|
||
|
||
* `i8080` (Intel 8080)
|
||
|
||
* `i8085` (Intel 8085)
|
||
|
||
* `strict8085` (Intel 8085 without illegal instructions)
|
||
|
||
* `gameboy` (Sharp LR35902; experimental)
|
||
|
||
* `i8086` (Intel 8086; very experimental, very buggy and very, very incomplete –
|
||
see the [8086 support disclaimer](../lang/x86disclaimer.md))
|
||
|
||
* `6809` (Motorola 6809; very experimental, very buggy and very, very incomplete –
|
||
many language features simply do not work at all for this target)
|
||
|
||
* `encoding` – default encoding for console I/O. Default: `ascii`.
|
||
See [the list of available encodings](../lang/text.md).
|
||
|
||
* `screen_encoding` – default encoding for screencodes (literals with encoding specified as `scr`).
|
||
Default: the same as `encoding`.
|
||
|
||
* `modules` – comma-separated list of modules that will be automatically imported.
|
||
This list cannot contain module template instantiations.
|
||
|
||
* other compilation options (they can be overridden using commandline options):
|
||
|
||
* `emit_illegals` – whether the compiler should emit illegal instructions, default `false`
|
||
|
||
* `emit_cmos` – whether the compiler should emit 65C02 instructions, default is `true` on compatible processors and `false` elsewhere
|
||
|
||
* `emit_65816` – which 65816 instructions should the compiler emit, either `no`, `emulation` or `native`
|
||
|
||
* `decimal_mode` – whether the compiler should emit decimal instructions, default is `false` on `ricoh` and `strictricoh` and `true` elsewhere;
|
||
if disabled, a software decimal mode will be used
|
||
|
||
* `emit_8085` – whether the compiler should emit Intel 8085 instructions, default is `true` on compatible processors and `false` elsewhere
|
||
|
||
* `emit_x80` – whether the compiler should emit instructions present on Sharp LR35902 and Z80, but absent on Intel 8080, default is `true` on compatible processors and `false` elsewhere
|
||
|
||
* `emit_z80` – whether the compiler should emit Zilog Z80 instructions not covered by `emit_x80`, default is `true` on compatible processors and `false` elsewhere
|
||
|
||
* `prevent_jmp_indirect_bug` – whether the compiler should try to avoid the indirect JMP bug,
|
||
default is `false` on 65C02-compatible or non-6502 processors and `true` elsewhere
|
||
|
||
* `compact_dispatch_params` – whether parameter values in return dispatch statements may overlap other objects, default is `true`.
|
||
This may cause problems if the parameter table is stored next to a hardware register that has side effects when reading.
|
||
|
||
* `lunix` – generate relocatable code for LUnix/LNG, default is `false`
|
||
|
||
* `zeropage_register` – reserve a certain amount of bytes of zero page as a pseudoregister to increase language features.
|
||
Default: `4` if targeting a 6502-based architecture, `0` otherwise.
|
||
`true` is a synonym of the current compiler default (currently: 4) and `false` is a synonym for 0.
|
||
|
||
* `inline` - inline functions automatically by default, default is `false`.
|
||
|
||
* `ipo` - enable interprocedural optimization, default is `false`.
|
||
|
||
* `function_fallthrough` – whether should replace a tail call by simply putting one function after another, default is `true`.
|
||
|
||
* `function_deduplication` – whether identical functions should be merged into one function, default is `true`.
|
||
|
||
* `subroutine_extraction` – whether identical fragments of functions should be extracted into subroutines, default is `false`.
|
||
|
||
* `lenient_encoding` - allow for automatic substitution of invalid characters in string literals using the default encodings, default is `false`.
|
||
|
||
* `use_shadow_registers_for_irq` – use Z80 shadow registers in interrupt routines, default is `true` for Z80 and `false` otherwise
|
||
|
||
* `ix_stack` – use the IX register to access stack variables, default is `true` for Z80 and 8086, `false` otherwise
|
||
|
||
* `iy_stack` – use the IY register to access stack variables, default is `false`
|
||
|
||
* `ix_scratch` – allow using the IY register for other purposes, default is `false`
|
||
|
||
* `iy_scratch` – allow using the IY register for other purposes, default is `false`
|
||
|
||
* `u_stack` – use the U register to access stack variables, default is `false`. Applicable only to 6809-based targets.
|
||
|
||
* `y_stack` – use the Y register to access stack variables, default is `false`. Applicable only to 6809-based targets.
|
||
**Warning: Currently, picking either `u_stack` or `y_stack` is required,
|
||
unless you want to always specify this option in the compiler's command line!**
|
||
The compiler doesn't support accessing the stack variables via the S stack pointer register yet.
|
||
|
||
* `software_stack` – use software stack for stack variables, default is `false`. Applicable only to 6502-based targets.
|
||
|
||
* `output_intel_syntax` – use Intel syntax instead of Zilog syntax, default is `true` for Intel 8080/8085 and `false` otherwise
|
||
|
||
|
||
#### `[define]` section
|
||
|
||
This section defines values of features of the target.
|
||
See the [preprocessor documentation](../lang/preprocessor.md) for more info.
|
||
|
||
#### `[allocation]` section
|
||
|
||
* `zp_pointers` –
|
||
either a list of comma separated zeropage addresses that can be used by the program as zeropage pointers, or `all` for all.
|
||
Each value should be the address of the first of two free bytes in the zeropage.
|
||
Only used for 6502-based targets. Cannot be used together with `zp_bytes`.
|
||
|
||
* `zp_bytes` –
|
||
either a list of comma separated zeropage byte addresses or address ranges that can be used by the program in zeropage, or `all` for all.
|
||
Only used for 6502-based targets. Cannot be used together with `zp_pointers`.
|
||
|
||
* `segments` – a comma-separated list of segment names.
|
||
A segment named `default` is always required.
|
||
Default: `default`. In all options below, `NAME` refers to a segment name.
|
||
|
||
* `default_code_segment` – the default segment for code and const arrays.
|
||
Note that the default segment for writable arrays and variables is always `default`.
|
||
Default: `default`
|
||
|
||
* `ram_init_segment` – the segment storing a copy of initial values for preinitialized writable arrays and variables.
|
||
The segment cannot be `default`. See [the ROM vs RAM guide](./rom-vs-ram.md) for more information.
|
||
Default: none.
|
||
|
||
* `segment_NAME_start` – the first address used for automatic allocation in the segment.
|
||
Note that on 6502-like targets, the `default` segment shouldn't start before $200, as the $0-$1FF range is reserved for the zeropage and the stack.
|
||
The first object defined in `segment_NAME_layout` (usually the `main` function)
|
||
will be placed as close to the beginning of its segment as possible,
|
||
but not necessarily at `segment_NAME_start`
|
||
|
||
* `segment_NAME_end` – the last address in the segment
|
||
|
||
* `segment_NAME_codeend` – the last address in the segment for code and const arrays.
|
||
Only uninitialized variables are allowed between `segment_NAME_codeend` and `segment_NAME_end`.
|
||
Default: the same as `segment_NAME_end`.
|
||
|
||
* `segment_NAME_datastart` – the first address used for non-zeropage variables, or `after_code` if the variables should be allocated after the code.
|
||
Default: `after_code`.
|
||
|
||
* `segment_NAME_bank` – the bank number the segment belongs to. Default: `0`.
|
||
For better debugging on NES, RAM segments should use bank number `$ff`.
|
||
|
||
* `segment_NAME_fill` – the byte value used to fill gaps and other unused space in the bank. Default: `0`.
|
||
|
||
* `segment_NAME_layout` – a comma-separated list of object names that defines in what order the objects are laid out in the segment.
|
||
One item has to be `*`, it means "all the other objects".
|
||
For example, `a,b,*,c,d` means that the output will contain `a` first, then `b`, then everything else except for `c` and `d`,
|
||
then `c` and finally `d`.
|
||
If an object from that list does not exist, it is ignored.
|
||
Default: `main,*`
|
||
|
||
#### `[output]` section
|
||
|
||
* `style` – how multi-segment programs should be output:
|
||
|
||
* `single` – output a single file, based mostly, but not necessarily only on data in the `default` segment (the default)
|
||
|
||
* `lunix` – like `single`, but add data necessary for relocation between code and data (requires `lunix` option in the `compilation` section)
|
||
|
||
* `per_segment` – generate a separate file with each segment
|
||
|
||
* `format` – output file format; a comma-separated list of tokens:
|
||
|
||
* literal byte values
|
||
|
||
* `startaddr` – little-endian 16-bit address of the first used byte of the compiled output (not necessarily the segment start)
|
||
|
||
* `startaddr_be` – the same, but big-endian
|
||
|
||
* `endaddr` – little-endian 16-bit address of the last used byte of the compiled output (usually not the segment end)
|
||
|
||
* `endaddr_be` – the same, but big-endian
|
||
|
||
* `startaddr+123`, `startaddr_be+123`, `endaddr+123`, `endaddr_be+123` – the same, but incremented by the given number
|
||
|
||
* `startaddr-123`, `startaddr_be-123`, `endaddr-123`, `endaddr_be-123` – the same, but decremented by the given number
|
||
|
||
* `startpage` – the high byte of `startaddr`
|
||
|
||
* `length` – little-endian 16-bit length of the compiled output; `endaddr - startaddr + 1`
|
||
|
||
* `length_be` – the same, but big-endian
|
||
|
||
* `length+123`, `length_be+123` – the same, but incremented by the given number
|
||
|
||
* `length-123`, `length_be-123` – the same, but decremented by the given number
|
||
|
||
* `allocated` – all used bytes
|
||
|
||
* `pagecount` – the number of pages used by all used bytes (including partially filled pages)
|
||
|
||
* `<addr>:<addr>` - inclusive range of bytes
|
||
|
||
* `<segment>:<addr>:<addr>` - inclusive range of bytes in a given segment
|
||
|
||
* `d88` - a D88 floppy disk image for PC-88
|
||
|
||
* `tap` - a tape disk image for ZX Spectrum
|
||
|
||
* `format_segment_NAME` – if using the `per_segment` style, overrides the format for the given segment
|
||
|
||
* `extension` – target file extension, with or without the dot
|
||
|
||
* `bbc_inf` – should the `.inf` file with file metadata for BBC Micro be created
|
||
|
||
* `gb_checksum` – should the main output file be patched with Game Boy-compatible checksums
|
||
|
||
* `labels` – format of the label file:
|
||
|
||
* `vice` (the default) – format compatible with the Vice emulator. The extension is `.lbl`.
|
||
|
||
* `nesasm` – format used by the NESASM assembler. The extension is `.fns`.
|
||
|
||
* `sym` – format used by the WLA/DX assembler. The extension is `.sym`.
|
||
|
||
* `fceux` – multi-file format used by the FCEUX emulator. The extension is `.nl`.
|