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//go:build baremetal
package runtime
import (
"unsafe"
)
//go:extern _heap_start
var heapStartSymbol [0]byte
//go:extern _heap_end
var heapEndSymbol [0]byte
//go:extern _globals_start
var globalsStartSymbol [0]byte
//go:extern _globals_end
var globalsEndSymbol [0]byte
//go:extern _stack_top
var stackTopSymbol [0]byte
var (
heapStart = uintptr(unsafe.Pointer(&heapStartSymbol))
heapEnd = uintptr(unsafe.Pointer(&heapEndSymbol))
globalsStart = uintptr(unsafe.Pointer(&globalsStartSymbol))
globalsEnd = uintptr(unsafe.Pointer(&globalsEndSymbol))
stackTop = uintptr(unsafe.Pointer(&stackTopSymbol))
)
// growHeap tries to grow the heap size. It returns true if it succeeds, false
// otherwise.
func growHeap() bool {
// On baremetal, there is no way the heap can be grown.
return false
}
//export malloc
func libc_malloc(size uintptr) unsafe.Pointer {
return alloc(size, nil)
}
//export calloc
func libc_calloc(nmemb, size uintptr) unsafe.Pointer {
// No difference between calloc and malloc.
return libc_malloc(nmemb * size)
}
//export free
func libc_free(ptr unsafe.Pointer) {
free(ptr)
}
//export runtime_putchar
func runtime_putchar(c byte) {
putchar(c)
}
//go:linkname syscall_Exit syscall.Exit
func syscall_Exit(code int) {
exit(code)
}
const baremetal = true
// timeOffset is how long the monotonic clock started after the Unix epoch. It
// should be a positive integer under normal operation or zero when it has not
// been set.
var timeOffset int64
//go:linkname now time.now
func now() (sec int64, nsec int32, mono int64) {
mono = nanotime()
sec = (mono + timeOffset) / (1000 * 1000 * 1000)
nsec = int32((mono + timeOffset) - sec*(1000*1000*1000))
return
}
// AdjustTimeOffset adds the given offset to the built-in time offset. A
// positive value adds to the time (skipping some time), a negative value moves
// the clock into the past.
func AdjustTimeOffset(offset int64) {
// TODO: do this atomically?
timeOffset += offset
}
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