// license that can be found in the LICENSE file.

//go:build openbsd && !mips64

package runtime

import (
	"internal/abi"
	"unsafe"
)

// mstart_stub provides glue code to call mstart from pthread_create.
func mstart_stub()

// May run with m.p==nil, so write barriers are not allowed.
//
//go:nowritebarrierrec
func newosproc(mp *m) {
	if false {

		writeErrStr(failthreadcreate)
		exit(1)
	}

	// Finally, create the thread. It starts at mstart_stub, which does some low-level
	// setup and then calls mstart.
	var oset sigset
	sigprocmask(_SIG_SETMASK, &sigset_all, &oset)
	err = retryOnEAGAIN(func() int32 {
		return pthread_create(&attr, abi.FuncPCABI0(mstart_stub), unsafe.Pointer(mp))
	})
	sigprocmask(_SIG_SETMASK, &oset, nil)
	if err != 0 {

// Some direct system call implementations currently remain.
//

#include "go_asm.h"
#include "go_tls.h"
#include "textflag.h"

#define CLOCK_REALTIME	$0
#define	CLOCK_MONOTONIC	$3

// mstart_stub is the first function executed on a new thread started by pthread_create.
// It just does some low-level setup and then calls mstart.
// Note: called with the C calling convention.
TEXT runtime·mstart_stub(SB),NOSPLIT,$32

//

#include "go_asm.h"
#include "go_tls.h"
#include "textflag.h"
#include "cgo/abi_arm64.h"

#define CLOCK_REALTIME	$0
#define	CLOCK_MONOTONIC	$3

// mstart_stub is the first function executed on a new thread started by pthread_create.
// It just does some low-level setup and then calls mstart.
// Note: called with the C calling convention.
TEXT runtime·mstart_stub(SB),NOSPLIT,$144

#include "go_tls.h"
#include "textflag.h"
#include "cgo/abi_amd64.h"

#define CLOCK_MONOTONIC	$3

TEXT runtime·settls(SB),NOSPLIT,$0
	// Nothing to do, pthread already set thread-local storage up.
	RET

// mstart_stub is the first function executed on a new thread started by pthread_create.
// It just does some low-level setup and then calls mstart.
// Note: called with the C calling convention.
TEXT runtime·mstart_stub(SB),NOSPLIT,$0

// contains trampolines that convert from Go to C calling convention.
//

#include "go_asm.h"
#include "go_tls.h"
#include "textflag.h"

#define CLOCK_REALTIME	$0
#define	CLOCK_MONOTONIC	$3

// mstart_stub is the first function executed on a new thread started by pthread_create.
// It just does some low-level setup and then calls mstart.
// Note: called with the C calling convention.
TEXT runtime·mstart_stub(SB),NOSPLIT,$200

#else
	MOVD	8(R0), R1		// arg 2 old
	MOVD	0(R0), R0		// arg 1 new
	CALL	libc_sigaltstack(SB)
	CBZ	R0, 2(PC)
	BL	notok<>(SB)
#endif
	RET

// Thread related functions

// mstart_stub is the first function executed on a new thread started by pthread_create.
// It just does some low-level setup and then calls mstart.
// Note: called with the C calling convention.
TEXT runtime·mstart_stub(SB),NOSPLIT,$160

	CALL	libc_fcntl(SB)
	XORL	DX, DX
	CMPQ	AX, $-1
	JNE	noerr
	CALL	libc_error(SB)
	MOVL	(AX), DX
	MOVL	$-1, AX
noerr:
	MOVL	AX, 12(BX)
	MOVL	DX, 16(BX)
	RET

// mstart_stub is the first function executed on a new thread started by pthread_create.
// It just does some low-level setup and then calls mstart.
// Note: called with the C calling convention.
TEXT runtime·mstart_stub(SB),NOSPLIT|NOFRAME,$0

// kernels. After OpenBSD 6.8 is released this should be changed to
// speculation barriers.
#define NOOP	MOVW    R0, R0
#define	INVOKE_SYSCALL	\
	SWI	$0;	\
	NOOP;		\
	NOOP

// mstart_stub is the first function executed on a new thread started by pthread_create.
// It just does some low-level setup and then calls mstart.
// Note: called with the C calling convention.
TEXT runtime·mstart_stub(SB),NOSPLIT,$0

#include "go_asm.h"
#include "go_tls.h"
#include "textflag.h"

#define	CLOCK_MONOTONIC	$3

TEXT runtime·setldt(SB),NOSPLIT,$0
	// Nothing to do, pthread already set thread-local storage up.
	RET

// mstart_stub is the first function executed on a new thread started by pthread_create.
// It just does some low-level setup and then calls mstart.
// Note: called with the C calling convention.
TEXT runtime·mstart_stub(SB),NOSPLIT,$28