df888acd5e
- Use compiler-rt and picolibc instead of avr-libc. - Use ld.lld instead of avr-ld (or avr-gcc). This makes it much easier to get started with TinyGo on AVR because installing these extra tools (gcc-avr, avr-libc) can be a hassle. It also opens the door for future improvements such as ThinLTO. There is a code size increase but I think it's worth it in the long run. The code size increase can hopefully be reduced with improvements to the LLVM AVR backend and to compiler-rt.
75 строки
1,6 КиБ
Go
75 строки
1,6 КиБ
Go
//go:build avr
|
|
// +build avr
|
|
|
|
package runtime
|
|
|
|
import "runtime/interrupt"
|
|
|
|
const GOARCH = "arm" // avr pretends to be arm
|
|
|
|
// The bitness of the CPU (e.g. 8, 32, 64).
|
|
const TargetBits = 8
|
|
|
|
const deferExtraRegs = 1 // the frame pointer (Y register) also needs to be stored
|
|
|
|
// Align on a word boundary.
|
|
func align(ptr uintptr) uintptr {
|
|
// No alignment necessary on the AVR.
|
|
return ptr
|
|
}
|
|
|
|
func getCurrentStackPointer() uintptr {
|
|
return uintptr(stacksave())
|
|
}
|
|
|
|
// The safest thing to do here would just be to disable interrupts for
|
|
// procPin/procUnpin. Note that a global variable is safe in this case, as any
|
|
// access to procPinnedMask will happen with interrupts disabled.
|
|
|
|
var procPinnedMask interrupt.State
|
|
|
|
//go:linkname procPin sync/atomic.runtime_procPin
|
|
func procPin() {
|
|
procPinnedMask = interrupt.Disable()
|
|
}
|
|
|
|
//go:linkname procUnpin sync/atomic.runtime_procUnpin
|
|
func procUnpin() {
|
|
interrupt.Restore(procPinnedMask)
|
|
}
|
|
|
|
// The following functions are workarounds for things missing in compiler-rt.
|
|
// They will likely need special assembly implementations.
|
|
|
|
//export __mulsi3
|
|
func __mulsi3(a, b uint32) uint32 {
|
|
var r uint32
|
|
for a != 0 {
|
|
if a&1 != 0 {
|
|
r += b
|
|
}
|
|
a >>= 1
|
|
b <<= 1
|
|
}
|
|
return r
|
|
}
|
|
|
|
//export __divsi3
|
|
func __divsi3(a, b int32) int32
|
|
|
|
//export __udivsi3
|
|
func __udivsi3(a, b uint32) uint32
|
|
|
|
//export __divmodsi4
|
|
func __divmodsi4(a, b int32) uint64 {
|
|
d := __divsi3(a, b)
|
|
rem := a - (d * b)
|
|
return uint64(uint32(d)) | uint64(uint32(rem))<<32
|
|
}
|
|
|
|
//export __udivmodsi4
|
|
func __udivmodsi4(a, b uint32) uint64 {
|
|
d := __udivsi3(a, b)
|
|
rem := a - (d * b)
|
|
return uint64(d) | uint64(rem)<<32
|
|
}
|