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interrupts!

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nora 2022-06-20 15:18:26 +02:00
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@ -88,6 +88,14 @@ The result is stored in the `place` `A`.
Div divides the `place` `A` by the `value` `B`.
The result is stored in the `place` `A`.
### Int
`int N`
Int performs the interrupt with the number `N`. `N` must be a number literal.
For a list of interrupts, see the list below.
### Cmp
`cmp A, B`
@ -112,4 +120,16 @@ the next instruction executed will be the instruction located at `L`.
`<IDENT>:`
A label is an identifier (regex: `[a-zA-Z]\w+`) followed by a colon (`:`). Jumps (like `jmp` or `je`) will be able
to jump to this label. A label is applied to the *next* instruction in the code.
to jump to this label. A label is applied to the *next* instruction in the code.
## Interrupts
### `int 0`
The interrupt 0 exits the program. The exit code is passed in `r0`.
### `int 1`
The interrupt 0 writes a string to standard output. `r0` contains the address of the string data.
`r1` contains the length of the string. The string is encoded as `UTF-8`. After the interrupt completed,
`r0` will contain a 0 if writing was successful, or a `1` if it failed.