4ec1e58aa6
We have an optimization for this specific pattern, but it's really just a hack. With the addition of unsafe.Add in Go 1.17 we can directly specify the intent instead and eventually remove this special case. The code is also easier to read.
54 строки
988 Б
Go
54 строки
988 Б
Go
//go:build cortexm
|
|
|
|
package runtime
|
|
|
|
import (
|
|
"unsafe"
|
|
)
|
|
|
|
//go:extern _sbss
|
|
var _sbss [0]byte
|
|
|
|
//go:extern _ebss
|
|
var _ebss [0]byte
|
|
|
|
//go:extern _sdata
|
|
var _sdata [0]byte
|
|
|
|
//go:extern _sidata
|
|
var _sidata [0]byte
|
|
|
|
//go:extern _edata
|
|
var _edata [0]byte
|
|
|
|
func preinit() {
|
|
// Initialize .bss: zero-initialized global variables.
|
|
ptr := unsafe.Pointer(&_sbss)
|
|
for ptr != unsafe.Pointer(&_ebss) {
|
|
*(*uint32)(ptr) = 0
|
|
ptr = unsafe.Add(ptr, 4)
|
|
}
|
|
|
|
// Initialize .data: global variables initialized from flash.
|
|
src := unsafe.Pointer(&_sidata)
|
|
dst := unsafe.Pointer(&_sdata)
|
|
for dst != unsafe.Pointer(&_edata) {
|
|
*(*uint32)(dst) = *(*uint32)(src)
|
|
dst = unsafe.Add(dst, 4)
|
|
src = unsafe.Add(src, 4)
|
|
}
|
|
}
|
|
|
|
// The stack layout at the moment an interrupt occurs.
|
|
// Registers can be accessed if the stack pointer is cast to a pointer to this
|
|
// struct.
|
|
type interruptStack struct {
|
|
R0 uintptr
|
|
R1 uintptr
|
|
R2 uintptr
|
|
R3 uintptr
|
|
R12 uintptr
|
|
LR uintptr
|
|
PC uintptr
|
|
PSR uintptr
|
|
}
|