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Erin 2023-11-15 18:11:29 +01:00
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c-abi.md
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# C ABI (proposal)
## C datatypes
| C Type | Description | Size (B) |
|:------------|:-------------------------|-------------:|
| char | Character / byte | 8 |
| short | Short integer | 16 |
| int | Integer | 32 |
| long | Long integer | 64 |
| long long | Long long integer | 64 |
| T* | Pointer | 64 |
| float | Single-precision float | 32 |
| double | Double-precision float | 64 |
| long double | Extended-precision float | **Bikeshed** |
## Registers
| Register | ABI Name | Description | Saver |
|:---------|:---------|:---------------|:-------|
| `r0` | — | Zero register | N/A |
| `r1` | `ra` | Return address | Caller |
| `r2` | `sp` | Stack pointer | Callee |
| `r3` | `tp` | Thread pointer | N/A |
**TODO:** Parameters
**TODO:** Saved
**TODO:** Temp