package runtime

import "unsafe"

// AtomicFields is the set of fields on which we perform 64-bit atomic
// operations (all the *64 operations in internal/runtime/atomic).
var AtomicFields = []uintptr{
	unsafe.Offsetof(m{}.procid),
	unsafe.Offsetof(p{}.gcFractionalMarkTime),
	unsafe.Offsetof(profBuf{}.overflow),
	unsafe.Offsetof(profBuf{}.overflowTime),
	unsafe.Offsetof(heapStatsDelta{}.tinyAllocCount),

	SUBQ	$(64*1024), AX		// stack size
	MOVQ	AX, (g_stack+stack_lo)(DX)
	MOVQ	AX, g_stackguard0(DX)
	MOVQ	AX, g_stackguard1(DX)

	// Initialize procid from TOS struct.
	MOVQ	_tos(SB), AX
	MOVL	64(AX), AX
	MOVQ	AX, m_procid(CX)	// save pid as m->procid

	// Finally, initialize g.
	get_tls(BX)
	MOVQ	DX, g(BX)

	CALL	runtime·stackcheck(SB)	// smashes AX, CX
	CALL	runtime·mstart(SB)

	SUBL	$(64*1024), AX		// stack size
	MOVL	AX, (g_stack+stack_lo)(DX)
	MOVL	AX, g_stackguard0(DX)
	MOVL	AX, g_stackguard1(DX)

	// Initialize procid from TOS struct.
	MOVL	_tos(SB), AX
	MOVL	48(AX), AX
	MOVL	AX, m_procid(CX)	// save pid as m->procid

	// Finally, initialize g.
	get_tls(BX)
	MOVL	DX, g(BX)

	CALL	runtime·stackcheck(SB)	// smashes AX, CX
	CALL	runtime·mstart(SB)

	MOVW	R0, g_stack+stack_hi(g)
	SUB	$(64*1024), R0
	MOVW	R0, (g_stack+stack_lo)(g)
	MOVW	R0, g_stackguard0(g)
	MOVW	R0, g_stackguard1(g)

	// Initialize procid from TOS struct.
	MOVW	_tos(SB), R0
	MOVW	48(R0), R0
	MOVW	R0, m_procid(R1)	// save pid as m->procid

	BL	runtime·mstart(SB)

	// Exit the thread.
	MOVW	$0, R0
	MOVW	R0, 4(R13)
	CALL	runtime·exits(SB)
	JMP	0(PC)

func miniterrno() {
	mp := getg().m
	r, _ := syscall0(&libc__Errno)
	mp.perrno = r

}

func minit() {
	miniterrno()
	minitSignals()
	getg().m.procid = uint64(pthread_self())
}

func unminit() {
	unminitSignals()
	getg().m.procid = 0
}

// Called from exitm, but not from drop, to undo the effect of thread-owned
// resources in minit, semacreate, or elsewhere. Do not take locks after calling this.

// the full requested amount.
// Whatever entropy r already contained is preserved.
func readTimeRandom(r []byte) {
	// Inspired by wyrand.
	// An earlier version of this code used getg().m.procid as well,
	// but note that this is called so early in startup that procid
	// is not initialized yet.
	v := uint64(nanotime())
	for len(r) > 0 {
		v ^= 0xa0761d6478bd642f
		v *= 0xe7037ed1a0b428db
		size := 8
		if len(r) < 8 {
			size = len(r)

var ArgTypes = [...]string{
	"seq",     // sequence number
	"pstatus", // P status
	"gstatus", // G status
	"g",       // trace.GoID
	"m",       // trace.ThreadID
	"p",       // trace.ProcID
	"string",  // string ID
	"stack",   // stack ID
	"value",   // uint64
	"task",    // trace.TaskID
}

// Names is a helper that produces a mapping of event names to event types.

import (
	"internal/runtime/atomic"
	"unsafe"
)

func osinit() {
	// https://webassembly.github.io/spec/core/exec/runtime.html#memory-instances
	physPageSize = 64 * 1024
	initBloc()
	ncpu = 1
	getg().m.procid = 2
}

const _SIGSEGV = 0xb

func sigpanic() {
	gp := getg()
	if !canpanic() {
		throw("unexpected signal during runtime execution")
	}

	// js only invokes the exception handler for memory faults.

	if traceEnabled() {
		throw("traceInitReadCPU called with trace enabled")
	}
	// Create new profBuf for CPU samples that will be emitted as events.
	// Format: after the timestamp, header is [pp.id, gp.goid, mp.procid].
	trace.cpuLogRead[0] = newProfBuf(3, profBufWordCount, profBufTagCount)
	trace.cpuLogRead[1] = newProfBuf(3, profBufWordCount, profBufTagCount)
	// We must not acquire trace.signalLock outside of a signal handler: a

	if gp.lockedm == 0 {
		return nil, plainError("goroutine not locked to thread")
	}

	tid := int(gp.lockedm.ptr().procid)
	if tid == 0 {
		return nil, plainError("missing tid")
	}

	f := efaceOf(&fn)
	if f._type == nil || f._type.Kind_&abi.KindMask != abi.Func {
		return nil, plainError("fn must be a function")
	}