syscall: implement syscalls on Darwin using libSystem

There are still some references to the bare Syscall functions
in the stdlib. I will root those out in a following CL.
(This CL is big enough as it is.)
Most are in vendor directories:

cmd/vendor/golang.org/x/sys/unix/
vendor/golang_org/x/net/route/syscall.go
syscall/bpf_bsd.go
syscall/exec_unix.go
syscall/flock.go

Update #17490

Change-Id: I69ab707811530c26b652b291cadee92f5bf5c1a4
Reviewed-on: https://go-review.googlesource.com/c/141639
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Elias Naur <elias.naur@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

src/cmd/internal/obj/x86/asm6.go

@@ -4704,7 +4704,9 @@ func (ab *AsmBuf) doasm(ctxt *obj.Link, cursym *obj.LSym, p *obj.Prog) {
 					r = obj.Addrel(cursym)
 					r.Off = int32(p.Pc + int64(ab.Len()))
 					r.Sym = p.To.Sym
-					r.Type = objabi.R_PCREL
+					// Note: R_CALL instead of R_PCREL. R_CALL is more permissive in that
+					// it can point to a trampoline instead of the destination itself.
+					r.Type = objabi.R_CALL
 					r.Siz = 4
 					ab.PutInt32(0)
 					break

src/internal/poll/fd_fsync_darwin.go

@@ -4,7 +4,10 @@
 
 package poll
 
-import "syscall"
+import (
+	"syscall"
+	_ "unsafe" // for go:linkname
+)
 
 // Fsync invokes SYS_FCNTL with SYS_FULLFSYNC because
 // on OS X, SYS_FSYNC doesn't fully flush contents to disk.
@@ -15,9 +18,10 @@ func (fd *FD) Fsync() error {
 	}
 	defer fd.decref()
 
-	_, _, e1 := syscall.Syscall(syscall.SYS_FCNTL, uintptr(fd.Sysfd), syscall.F_FULLFSYNC, 0)
-	if e1 != 0 {
-		return e1
-	}
-	return nil
+	_, e1 := fcntl(fd.Sysfd, syscall.F_FULLFSYNC, 0)
+	return e1
 }
+
+// Implemented in syscall/syscall_darwin.go.
+//go:linkname fcntl syscall.fcntl
+func fcntl(fd int, cmd int, arg int) (int, error)

src/internal/poll/fd_fsync_posix.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build aix dragonfly freebsd js,wasm linux nacl netbsd openbsd solaris windows
+// +build aix dragonfly freebsd js,wasm linux nacl netbsd openbsd solaris
 
 package poll
 
@@ -16,3 +16,11 @@ func (fd *FD) Fsync() error {
 	defer fd.decref()
 	return syscall.Fsync(fd.Sysfd)
 }
+
+func fcntl(fd int, cmd int, arg int) (int, error) {
+	r, _, e := syscall.Syscall(syscall.SYS_FCNTL, uintptr(fd), uintptr(cmd), uintptr(arg))
+	if e != 0 {
+		return int(r), syscall.Errno(e)
+	}
+	return int(r), nil
+}

src/internal/poll/fd_fsync_windows.go

+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package poll
+
+import "syscall"
+
+// Fsync wraps syscall.Fsync.
+func (fd *FD) Fsync() error {
+	if err := fd.incref(); err != nil {
+		return err
+	}
+	defer fd.decref()
+	return syscall.Fsync(fd.Sysfd)
+}

src/internal/poll/fd_unix.go

@@ -452,10 +452,11 @@ var tryDupCloexec = int32(1)
 // DupCloseOnExec dups fd and marks it close-on-exec.
 func DupCloseOnExec(fd int) (int, string, error) {
 	if atomic.LoadInt32(&tryDupCloexec) == 1 {
-		r0, _, e1 := syscall.Syscall(syscall.SYS_FCNTL, uintptr(fd), syscall.F_DUPFD_CLOEXEC, 0)
-		switch e1 {
-		case 0:
-			return int(r0), "", nil
+		r0, e1 := fcntl(fd, syscall.F_DUPFD_CLOEXEC, 0)
+		if e1 == nil {
+			return r0, "", nil
+		}
+		switch e1.(syscall.Errno) {
 		case syscall.EINVAL, syscall.ENOSYS:
 			// Old kernel, or js/wasm (which returns
 			// ENOSYS). Fall back to the portable way from

src/internal/poll/fd_writev_darwin.go

+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build darwin
+
+package poll
+
+import (
+	"syscall"
+	_ "unsafe" // for go:linkname
+)
+
+// Implemented in syscall/syscall_darwin.go.
+//go:linkname writev syscall.writev
+func writev(fd int, iovecs []syscall.Iovec) (uintptr, error)

src/internal/poll/fd_writev_unix.go

+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build dragonfly freebsd linux netbsd openbsd
+
+package poll
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+func writev(fd int, iovecs []syscall.Iovec) (uintptr, error) {
+	r, _, e := syscall.Syscall(syscall.SYS_WRITEV, uintptr(fd), uintptr(unsafe.Pointer(&iovecs[0])), uintptr(len(iovecs)))
+	if e != 0 {
+		return r, syscall.Errno(e)
+	}
+	return r, nil
+}

src/internal/poll/writev.go

@@ -9,7 +9,6 @@ package poll
 import (
 	"io"
 	"syscall"
-	"unsafe"
 )
 
 // Writev wraps the writev system call.
@@ -54,24 +53,20 @@ func (fd *FD) Writev(v *[][]byte) (int64, error) {
 		}
 		fd.iovecs = &iovecs // cache
 
-		wrote, _, e0 := syscall.Syscall(syscall.SYS_WRITEV,
-			uintptr(fd.Sysfd),
-			uintptr(unsafe.Pointer(&iovecs[0])),
-			uintptr(len(iovecs)))
+		var wrote uintptr
+		wrote, err = writev(fd.Sysfd, iovecs)
 		if wrote == ^uintptr(0) {
 			wrote = 0
 		}
 		TestHookDidWritev(int(wrote))
 		n += int64(wrote)
 		consume(v, int64(wrote))
-		if e0 == syscall.EAGAIN {
-			if err = fd.pd.waitWrite(fd.isFile); err == nil {
-				continue
-			}
-		} else if e0 != 0 {
-			err = syscall.Errno(e0)
-		}
 		if err != nil {
+			if err.(syscall.Errno) == syscall.EAGAIN {
+				if err = fd.pd.waitWrite(fd.isFile); err == nil {
+					continue
+				}
+			}
 			break
 		}
 		if n == 0 {

src/internal/syscall/unix/empty.s

+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// This exists solely so we can linkname in symbols from syscall.

src/internal/syscall/unix/nonblocking.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
+// +build aix dragonfly freebsd linux netbsd openbsd solaris
 
 package unix
 

src/internal/syscall/unix/nonblocking_darwin.go

+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build darwin
+
+package unix
+
+import (
+	"syscall"
+	_ "unsafe" // for go:linkname
+)
+
+func IsNonblock(fd int) (nonblocking bool, err error) {
+	flag, e1 := fcntl(fd, syscall.F_GETFL, 0)
+	if e1 != nil {
+		return false, e1
+	}
+	return flag&syscall.O_NONBLOCK != 0, nil
+}
+
+// Implemented in syscall/syscall_darwin.go.
+//go:linkname fcntl syscall.fcntl
+func fcntl(fd int, cmd int, arg int) (int, error)

src/runtime/sys_darwin.go

@@ -50,6 +50,61 @@ func libcCall(fn, arg unsafe.Pointer) int32 {
 	return res
 }
 
+// The X versions of syscall expect the libc call to return a 64-bit result.
+// Otherwise (the non-X version) expects a 32-bit result.
+// This distinction is required because an error is indicated by returning -1,
+// and we need to know whether to check 32 or 64 bits of the result.
+// (Some libc functions that return 32 bits put junk in the upper 32 bits of AX.)
+
+//go:linkname syscall_syscall syscall.syscall
+//go:nosplit
+//go:cgo_unsafe_args
+func syscall_syscall(fn, a1, a2, a3 uintptr) (r1, r2, err uintptr) {
+	entersyscallblock()
+	libcCall(unsafe.Pointer(funcPC(syscall)), unsafe.Pointer(&fn))
+	exitsyscall()
+	return
+}
+func syscall()
+
+//go:linkname syscall_syscall6 syscall.syscall6
+//go:nosplit
+//go:cgo_unsafe_args
+func syscall_syscall6(fn, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr) {
+	entersyscallblock()
+	libcCall(unsafe.Pointer(funcPC(syscall6)), unsafe.Pointer(&fn))
+	exitsyscall()
+	return
+}
+func syscall6()
+
+//go:linkname syscall_syscall6X syscall.syscall6X
+//go:nosplit
+//go:cgo_unsafe_args
+func syscall_syscall6X(fn, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr) {
+	entersyscallblock()
+	libcCall(unsafe.Pointer(funcPC(syscall6X)), unsafe.Pointer(&fn))
+	exitsyscall()
+	return
+}
+func syscall6X()
+
+//go:linkname syscall_rawSyscall syscall.rawSyscall
+//go:nosplit
+//go:cgo_unsafe_args
+func syscall_rawSyscall(fn, a1, a2, a3 uintptr) (r1, r2, err uintptr) {
+	libcCall(unsafe.Pointer(funcPC(syscall)), unsafe.Pointer(&fn))
+	return
+}
+
+//go:linkname syscall_rawSyscall6 syscall.rawSyscall6
+//go:nosplit
+//go:cgo_unsafe_args
+func syscall_rawSyscall6(fn, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr) {
+	libcCall(unsafe.Pointer(funcPC(syscall6)), unsafe.Pointer(&fn))
+	return
+}
+
 // The *_trampoline functions convert from the Go calling convention to the C calling convention
 // and then call the underlying libc function.  They are defined in sys_darwin_$ARCH.s.
 

src/runtime/sys_darwin_32.go

+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build darwin
+// +build 386 arm
+
+package runtime
+
+import "unsafe"
+
+//go:linkname syscall_syscall9 syscall.syscall9
+//go:nosplit
+//go:cgo_unsafe_args
+func syscall_syscall9(fn, a1, a2, a3, a4, a5, a6, a7, a8, a9 uintptr) (r1, r2, err uintptr) {
+	entersyscallblock()
+	libcCall(unsafe.Pointer(funcPC(syscall9)), unsafe.Pointer(&fn))
+	exitsyscall()
+	return
+}
+func syscall9()

src/runtime/sys_darwin_386.s

@@ -625,3 +625,237 @@ TEXT runtime·pthread_cond_signal_trampoline(SB),NOSPLIT,$0
 	MOVL	BP, SP
 	POPL	BP
 	RET
+
+// syscall calls a function in libc on behalf of the syscall package.
+// syscall takes a pointer to a struct like:
+// struct {
+//	fn    uintptr
+//	a1    uintptr
+//	a2    uintptr
+//	a3    uintptr
+//	r1    uintptr
+//	r2    uintptr
+//	err   uintptr
+// }
+// syscall must be called on the g0 stack with the
+// C calling convention (use libcCall).
+TEXT runtime·syscall(SB),NOSPLIT,$0
+	PUSHL	BP
+	MOVL	SP, BP
+	SUBL	$24, SP
+	MOVL	32(SP), CX
+	MOVL	(0*4)(CX), AX // fn
+	MOVL	(1*4)(CX), DX // a1
+	MOVL	DX, 0(SP)
+	MOVL	(2*4)(CX), DX // a2
+	MOVL	DX, 4(SP)
+	MOVL	(3*4)(CX), DX // a3
+	MOVL	DX, 8(SP)
+
+	CALL	AX
+
+	MOVL	32(SP), CX
+	MOVL	AX, (4*4)(CX) // r1
+	MOVL	DX, (5*4)(CX) // r2
+
+	// Standard libc functions return -1 on error
+	// and set errno.
+	CMPL	AX, $-1
+	JNE	ok
+
+	// Get error code from libc.
+	CALL	libc_error(SB)
+	MOVL	(AX), AX
+	MOVL	32(SP), CX
+	MOVL	AX, (6*4)(CX) // err
+
+ok:
+	XORL	AX, AX        // no error (it's ignored anyway)
+	MOVL	BP, SP
+	POPL	BP
+	RET
+
+// syscall6 calls a function in libc on behalf of the syscall package.
+// syscall6 takes a pointer to a struct like:
+// struct {
+//	fn    uintptr
+//	a1    uintptr
+//	a2    uintptr
+//	a3    uintptr
+//	a4    uintptr
+//	a5    uintptr
+//	a6    uintptr
+//	r1    uintptr
+//	r2    uintptr
+//	err   uintptr
+// }
+// syscall6 must be called on the g0 stack with the
+// C calling convention (use libcCall).
+TEXT runtime·syscall6(SB),NOSPLIT,$0
+	PUSHL	BP
+	MOVL	SP, BP
+	SUBL	$24, SP
+	MOVL	32(SP), CX
+	MOVL	(0*4)(CX), AX // fn
+	MOVL	(1*4)(CX), DX // a1
+	MOVL	DX, 0(SP)
+	MOVL	(2*4)(CX), DX // a2
+	MOVL	DX, 4(SP)
+	MOVL	(3*4)(CX), DX // a3
+	MOVL	DX, 8(SP)
+	MOVL	(4*4)(CX), DX // a4
+	MOVL	DX, 12(SP)
+	MOVL	(5*4)(CX), DX // a5
+	MOVL	DX, 16(SP)
+	MOVL	(6*4)(CX), DX // a6
+	MOVL	DX, 20(SP)
+
+	CALL	AX
+
+	MOVL	32(SP), CX
+	MOVL	AX, (7*4)(CX) // r1
+	MOVL	DX, (8*4)(CX) // r2
+
+	// Standard libc functions return -1 on error
+	// and set errno.
+	CMPL	AX, $-1
+	JNE	ok
+
+	// Get error code from libc.
+	CALL	libc_error(SB)
+	MOVL	(AX), AX
+	MOVL	32(SP), CX
+	MOVL	AX, (9*4)(CX) // err
+
+ok:
+	XORL	AX, AX        // no error (it's ignored anyway)
+	MOVL	BP, SP
+	POPL	BP
+	RET
+
+// syscall6X calls a function in libc on behalf of the syscall package.
+// syscall6X takes a pointer to a struct like:
+// struct {
+//	fn    uintptr
+//	a1    uintptr
+//	a2    uintptr
+//	a3    uintptr
+//	a4    uintptr
+//	a5    uintptr
+//	a6    uintptr
+//	r1    uintptr
+//	r2    uintptr
+//	err   uintptr
+// }
+// syscall6X must be called on the g0 stack with the
+// C calling convention (use libcCall).
+TEXT runtime·syscall6X(SB),NOSPLIT,$0
+	PUSHL	BP
+	MOVL	SP, BP
+	SUBL	$24, SP
+	MOVL	32(SP), CX
+	MOVL	(0*4)(CX), AX // fn
+	MOVL	(1*4)(CX), DX // a1
+	MOVL	DX, 0(SP)
+	MOVL	(2*4)(CX), DX // a2
+	MOVL	DX, 4(SP)
+	MOVL	(3*4)(CX), DX // a3
+	MOVL	DX, 8(SP)
+	MOVL	(4*4)(CX), DX // a4
+	MOVL	DX, 12(SP)
+	MOVL	(5*4)(CX), DX // a5
+	MOVL	DX, 16(SP)
+	MOVL	(6*4)(CX), DX // a6
+	MOVL	DX, 20(SP)
+
+	CALL	AX
+
+	MOVL	32(SP), CX
+	MOVL	AX, (7*4)(CX) // r1
+	MOVL	DX, (8*4)(CX) // r2
+
+	// Standard libc functions return -1 on error
+	// and set errno.
+	CMPL	AX, $-1
+	JNE	ok
+	CMPL	DX, $-1
+	JNE	ok
+
+	// Get error code from libc.
+	CALL	libc_error(SB)
+	MOVL	(AX), AX
+	MOVL	32(SP), CX
+	MOVL	AX, (9*4)(CX) // err
+
+ok:
+	XORL	AX, AX        // no error (it's ignored anyway)
+	MOVL	BP, SP
+	POPL	BP
+	RET
+
+// syscall9 calls a function in libc on behalf of the syscall package.
+// syscall9 takes a pointer to a struct like:
+// struct {
+//	fn    uintptr
+//	a1    uintptr
+//	a2    uintptr
+//	a3    uintptr
+//	a4    uintptr
+//	a5    uintptr
+//	a6    uintptr
+//	a7    uintptr
+//	a8    uintptr
+//	a9    uintptr
+//	r1    uintptr
+//	r2    uintptr
+//	err   uintptr
+// }
+// syscall9 must be called on the g0 stack with the
+// C calling convention (use libcCall).
+TEXT runtime·syscall9(SB),NOSPLIT,$0
+	PUSHL	BP
+	MOVL	SP, BP
+	SUBL	$40, SP
+	MOVL	48(SP), CX
+	MOVL	(0*4)(CX), AX // fn
+	MOVL	(1*4)(CX), DX // a1
+	MOVL	DX, 0(SP)
+	MOVL	(2*4)(CX), DX // a2
+	MOVL	DX, 4(SP)
+	MOVL	(3*4)(CX), DX // a3
+	MOVL	DX, 8(SP)
+	MOVL	(4*4)(CX), DX // a4
+	MOVL	DX, 12(SP)
+	MOVL	(5*4)(CX), DX // a5
+	MOVL	DX, 16(SP)
+	MOVL	(6*4)(CX), DX // a6
+	MOVL	DX, 20(SP)
+	MOVL	(7*4)(CX), DX // a7
+	MOVL	DX, 24(SP)
+	MOVL	(8*4)(CX), DX // a8
+	MOVL	DX, 28(SP)
+	MOVL	(9*4)(CX), DX // a9
+	MOVL	DX, 32(SP)
+
+	CALL	AX
+
+	MOVL	48(SP), CX
+	MOVL	AX, (10*4)(CX) // r1
+	MOVL	DX, (11*4)(CX) // r2
+
+	// Standard libc functions return -1 on error
+	// and set errno.
+	CMPL	AX, $-1
+	JNE	ok
+
+	// Get error code from libc.
+	CALL	libc_error(SB)
+	MOVL	(AX), AX
+	MOVL	48(SP), CX
+	MOVL	AX, (12*4)(CX) // err
+
+ok:
+	XORL	AX, AX        // no error (it's ignored anyway)
+	MOVL	BP, SP
+	POPL	BP
+	RET

src/runtime/sys_darwin_64.go

+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build darwin
+// +build amd64 arm64
+
+package runtime
+
+import "unsafe"
+
+//go:linkname syscall_syscallX syscall.syscallX
+//go:nosplit
+//go:cgo_unsafe_args
+func syscall_syscallX(fn, a1, a2, a3 uintptr) (r1, r2, err uintptr) {
+	entersyscallblock()
+	libcCall(unsafe.Pointer(funcPC(syscallX)), unsafe.Pointer(&fn))
+	exitsyscall()
+	return
+}
+func syscallX()

src/runtime/sys_darwin_amd64.s

@@ -26,6 +26,7 @@ TEXT runtime·open_trampoline(SB),NOSPLIT,$0
 	MOVL	8(DI), SI		// arg 2 flags
 	MOVL	12(DI), DX		// arg 3 mode
 	MOVQ	0(DI), DI		// arg 1 pathname
+	XORL	AX, AX			// vararg: say "no float args"
 	CALL	libc_open(SB)
 	POPQ	BP
 	RET
@@ -383,6 +384,7 @@ TEXT runtime·fcntl_trampoline(SB),NOSPLIT,$0
 	MOVL	4(DI), SI		// arg 2 cmd
 	MOVL	8(DI), DX		// arg 3 arg
 	MOVL	0(DI), DI		// arg 1 fd
+	XORL	AX, AX			// vararg: say "no float args"
 	CALL	libc_fcntl(SB)
 	POPQ	BP
 	RET
@@ -540,3 +542,197 @@ TEXT runtime·pthread_cond_signal_trampoline(SB),NOSPLIT,$0
 	CALL	libc_pthread_cond_signal(SB)
 	POPQ	BP
 	RET
+
+// syscall calls a function in libc on behalf of the syscall package.
+// syscall takes a pointer to a struct like:
+// struct {
+//	fn    uintptr
+//	a1    uintptr
+//	a2    uintptr
+//	a3    uintptr
+//	r1    uintptr
+//	r2    uintptr
+//	err   uintptr
+// }
+// syscall must be called on the g0 stack with the
+// C calling convention (use libcCall).
+TEXT runtime·syscall(SB),NOSPLIT,$0
+	PUSHQ	BP
+	MOVQ	SP, BP
+	SUBQ	$16, SP
+	MOVQ	(0*8)(DI), CX // fn
+	MOVQ	(2*8)(DI), SI // a2
+	MOVQ	(3*8)(DI), DX // a3
+	MOVQ	DI, (SP)
+	MOVQ	(1*8)(DI), DI // a1
+	XORL	AX, AX	      // vararg: say "no float args"
+
+	CALL	CX
+
+	MOVQ	(SP), DI
+	MOVQ	AX, (4*8)(DI) // r1
+	MOVQ	DX, (5*8)(DI) // r2
+
+	// Standard libc functions return -1 on error
+	// and set errno.
+	CMPL	AX, $-1	      // Note: high 32 bits are junk
+	JNE	ok
+
+	// Get error code from libc.
+	CALL	libc_error(SB)
+	MOVLQSX	(AX), AX
+	MOVQ	(SP), DI
+	MOVQ	AX, (6*8)(DI) // err
+
+ok:
+	XORL	AX, AX        // no error (it's ignored anyway)
+	MOVQ	BP, SP
+	POPQ	BP
+	RET
+
+// syscallX calls a function in libc on behalf of the syscall package.
+// syscallX takes a pointer to a struct like:
+// struct {
+//	fn    uintptr
+//	a1    uintptr
+//	a2    uintptr
+//	a3    uintptr
+//	r1    uintptr
+//	r2    uintptr
+//	err   uintptr
+// }
+// syscallX must be called on the g0 stack with the
+// C calling convention (use libcCall).
+TEXT runtime·syscallX(SB),NOSPLIT,$0
+	PUSHQ	BP
+	MOVQ	SP, BP
+	SUBQ	$16, SP
+	MOVQ	(0*8)(DI), CX // fn
+	MOVQ	(2*8)(DI), SI // a2
+	MOVQ	(3*8)(DI), DX // a3
+	MOVQ	DI, (SP)
+	MOVQ	(1*8)(DI), DI // a1
+	XORL	AX, AX	      // vararg: say "no float args"
+
+	CALL	CX
+
+	MOVQ	(SP), DI
+	MOVQ	AX, (4*8)(DI) // r1
+	MOVQ	DX, (5*8)(DI) // r2
+
+	// Standard libc functions return -1 on error
+	// and set errno.
+	CMPQ	AX, $-1
+	JNE	ok
+
+	// Get error code from libc.
+	CALL	libc_error(SB)
+	MOVLQSX	(AX), AX
+	MOVQ	(SP), DI
+	MOVQ	AX, (6*8)(DI) // err
+
+ok:
+	XORL	AX, AX        // no error (it's ignored anyway)
+	MOVQ	BP, SP
+	POPQ	BP
+	RET
+
+// syscall6 calls a function in libc on behalf of the syscall package.
+// syscall6 takes a pointer to a struct like:
+// struct {
+//	fn    uintptr
+//	a1    uintptr
+//	a2    uintptr
+//	a3    uintptr
+//	a4    uintptr
+//	a5    uintptr
+//	a6    uintptr
+//	r1    uintptr
+//	r2    uintptr
+//	err   uintptr
+// }
+// syscall6 must be called on the g0 stack with the
+// C calling convention (use libcCall).
+TEXT runtime·syscall6(SB),NOSPLIT,$0
+	PUSHQ	BP
+	MOVQ	SP, BP
+	SUBQ	$16, SP
+	MOVQ	(0*8)(DI), R11// fn
+	MOVQ	(2*8)(DI), SI // a2
+	MOVQ	(3*8)(DI), DX // a3
+	MOVQ	(4*8)(DI), CX // a4
+	MOVQ	(5*8)(DI), R8 // a5
+	MOVQ	(6*8)(DI), R9 // a6
+	MOVQ	DI, (SP)
+	MOVQ	(1*8)(DI), DI // a1
+	XORL	AX, AX	      // vararg: say "no float args"
+
+	CALL	R11
+
+	MOVQ	(SP), DI
+	MOVQ	AX, (7*8)(DI) // r1
+	MOVQ	DX, (8*8)(DI) // r2
+
+	CMPL	AX, $-1
+	JNE	ok
+
+	CALL	libc_error(SB)
+	MOVLQSX	(AX), AX
+	MOVQ	(SP), DI
+	MOVQ	AX, (9*8)(DI) // err
+
+ok:
+	XORL	AX, AX        // no error (it's ignored anyway)
+	MOVQ	BP, SP
+	POPQ	BP
+	RET
+
+// syscall6X calls a function in libc on behalf of the syscall package.
+// syscall6X takes a pointer to a struct like:
+// struct {
+//	fn    uintptr
+//	a1    uintptr
+//	a2    uintptr
+//	a3    uintptr
+//	a4    uintptr
+//	a5    uintptr
+//	a6    uintptr
+//	r1    uintptr
+//	r2    uintptr
+//	err   uintptr
+// }
+// syscall6X must be called on the g0 stack with the
+// C calling convention (use libcCall).
+TEXT runtime·syscall6X(SB),NOSPLIT,$0
+	PUSHQ	BP
+	MOVQ	SP, BP
+	SUBQ	$16, SP
+	MOVQ	(0*8)(DI), R11// fn
+	MOVQ	(2*8)(DI), SI // a2
+	MOVQ	(3*8)(DI), DX // a3
+	MOVQ	(4*8)(DI), CX // a4
+	MOVQ	(5*8)(DI), R8 // a5
+	MOVQ	(6*8)(DI), R9 // a6
+	MOVQ	DI, (SP)
+	MOVQ	(1*8)(DI), DI // a1
+	XORL	AX, AX	      // vararg: say "no float args"
+
+	CALL	R11
+
+	MOVQ	(SP), DI
+	MOVQ	AX, (7*8)(DI) // r1
+	MOVQ	DX, (8*8)(DI) // r2
+
+	CMPQ	AX, $-1
+	JNE	ok
+
+	CALL	libc_error(SB)
+	MOVLQSX	(AX), AX
+	MOVQ	(SP), DI
+	MOVQ	AX, (9*8)(DI) // err
+
+ok:
+	XORL	AX, AX        // no error (it's ignored anyway)
+	MOVQ	BP, SP
+	POPQ	BP
+	RET

src/runtime/sys_darwin_arm.s

@@ -382,3 +382,177 @@ TEXT runtime·pthread_cond_signal_trampoline(SB),NOSPLIT,$0
 	MOVW	0(R0), R0	// arg 1 cond
 	BL	libc_pthread_cond_signal(SB)
 	RET
+
+// syscall calls a function in libc on behalf of the syscall package.
+// syscall takes a pointer to a struct like:
+// struct {
+//	fn    uintptr
+//	a1    uintptr
+//	a2    uintptr
+//	a3    uintptr
+//	r1    uintptr
+//	r2    uintptr
+//	err   uintptr
+// }
+// syscall must be called on the g0 stack with the
+// C calling convention (use libcCall).
+TEXT runtime·syscall(SB),NOSPLIT,$0
+	MOVW.W	R0, -4(R13)	// push structure pointer
+	MOVW	0(R0), R12	// fn
+	MOVW	8(R0), R1	// a2
+	MOVW	12(R0), R2	// a3
+	MOVW	4(R0), R0	// a1
+	BL	(R12)
+	MOVW.P	4(R13), R2	// pop structure pointer
+	MOVW	R0, 16(R2)	// save r1
+	MOVW	R1, 20(R2)	// save r2
+	MOVW	$-1, R3
+	CMP	R0, R3
+	BNE	ok
+	MOVW.W	R2, -4(R13)	// push structure pointer
+	BL	libc_error(SB)
+	MOVW	(R0), R0
+	MOVW.P	4(R13), R2	// pop structure pointer
+	MOVW	R0, 24(R2)	// save err
+ok:
+	RET
+
+// syscall6 calls a function in libc on behalf of the syscall package.
+// syscall6 takes a pointer to a struct like:
+// struct {
+//	fn    uintptr
+//	a1    uintptr
+//	a2    uintptr
+//	a3    uintptr
+//	a4    uintptr
+//	a5    uintptr
+//	a6    uintptr
+//	r1    uintptr
+//	r2    uintptr
+//	err   uintptr
+// }
+// syscall6 must be called on the g0 stack with the
+// C calling convention (use libcCall).
+TEXT runtime·syscall6(SB),NOSPLIT,$0
+	MOVW.W	R0, -4(R13)	// push structure pointer
+	MOVW	0(R0), R12	// fn
+	MOVW	24(R0), R1	// a6
+	MOVW.W	R1, -4(R13)
+	MOVW	20(R0), R1	// a5
+	MOVW.W	R1, -4(R13)
+	MOVW	8(R0), R1	// a2
+	MOVW	12(R0), R2	// a3
+	MOVW	16(R0), R3	// a4
+	MOVW	4(R0), R0	// a1
+	BL	(R12)
+	ADD	$8, R13
+	MOVW.P	4(R13), R2	// pop structure pointer
+	MOVW	R0, 28(R2)	// save r1
+	MOVW	R1, 32(R2)	// save r2
+	MOVW	$-1, R3
+	CMP	R0, R3
+	BNE	ok
+	MOVW.W	R2, -4(R13)	// push structure pointer
+	BL	libc_error(SB)
+	MOVW	(R0), R0
+	MOVW.P	4(R13), R2	// pop structure pointer
+	MOVW	R0, 36(R2)	// save err
+ok:
+	RET
+
+// syscall6X calls a function in libc on behalf of the syscall package.
+// syscall6X takes a pointer to a struct like:
+// struct {
+//	fn    uintptr
+//	a1    uintptr
+//	a2    uintptr
+//	a3    uintptr
+//	a4    uintptr
+//	a5    uintptr
+//	a6    uintptr
+//	r1    uintptr
+//	r2    uintptr
+//	err   uintptr
+// }
+// syscall6X must be called on the g0 stack with the
+// C calling convention (use libcCall).
+TEXT runtime·syscall6X(SB),NOSPLIT,$0
+	MOVW.W	R0, -4(R13)	// push structure pointer
+	MOVW	0(R0), R12	// fn
+	MOVW	24(R0), R1	// a6
+	MOVW.W	R1, -4(R13)
+	MOVW	20(R0), R1	// a5
+	MOVW.W	R1, -4(R13)
+	MOVW	8(R0), R1	// a2
+	MOVW	12(R0), R2	// a3
+	MOVW	16(R0), R3	// a4
+	MOVW	4(R0), R0	// a1
+	BL	(R12)
+	ADD	$8, R13
+	MOVW.P	4(R13), R2	// pop structure pointer
+	MOVW	R0, 28(R2)	// save r1
+	MOVW	R1, 32(R2)	// save r2
+	MOVW	$-1, R3
+	CMP	R0, R3
+	BNE	ok
+	CMP	R1, R3
+	BNE	ok
+	MOVW.W	R2, -4(R13)	// push structure pointer
+	BL	libc_error(SB)
+	MOVW	(R0), R0
+	MOVW.P	4(R13), R2	// pop structure pointer
+	MOVW	R0, 36(R2)	// save err
+ok:
+	RET
+
+// syscall9 calls a function in libc on behalf of the syscall package.
+// syscall9 takes a pointer to a struct like:
+// struct {
+//	fn    uintptr
+//	a1    uintptr
+//	a2    uintptr
+//	a3    uintptr
+//	a4    uintptr
+//	a5    uintptr
+//	a6    uintptr
+//	a7    uintptr
+//	a8    uintptr
+//	a9    uintptr
+//	r1    uintptr
+//	r2    uintptr
+//	err   uintptr
+// }
+// syscall9 must be called on the g0 stack with the
+// C calling convention (use libcCall).
+TEXT runtime·syscall9(SB),NOSPLIT,$0
+	MOVW.W	R0, -4(R13)	// push structure pointer
+	MOVW	0(R0), R12	// fn
+	MOVW	36(R0), R1	// a9
+	MOVW.W	R1, -4(R13)
+	MOVW	32(R0), R1	// a8
+	MOVW.W	R1, -4(R13)
+	MOVW	28(R0), R1	// a7
+	MOVW.W	R1, -4(R13)
+	MOVW	24(R0), R1	// a6
+	MOVW.W	R1, -4(R13)
+	MOVW	20(R0), R1	// a5
+	MOVW.W	R1, -4(R13)
+	MOVW	8(R0), R1	// a2
+	MOVW	12(R0), R2	// a3
+	MOVW	16(R0), R3	// a4
+	MOVW	4(R0), R0	// a1
+	BL	(R12)
+	ADD	$20, R13
+	MOVW.P	4(R13), R2	// pop structure pointer
+	MOVW	R0, 40(R2)	// save r1
+	MOVW	R1, 44(R2)	// save r2
+	MOVW	$-1, R3
+	CMP	R0, R3
+	BNE	ok
+	MOVW.W	R2, -4(R13)	// push structure pointer
+	BL	libc_error(SB)
+	MOVW	(R0), R0
+	MOVW.P	4(R13), R2	// pop structure pointer
+	MOVW	R0, 48(R2)	// save err
+ok:
+	RET

src/runtime/sys_darwin_arm64.s

@@ -16,10 +16,13 @@ TEXT notok<>(SB),NOSPLIT,$0
 	B	0(PC)
 
 TEXT runtime·open_trampoline(SB),NOSPLIT,$0
+	SUB	$16, RSP
 	MOVW	8(R0), R1	// arg 2 flags
 	MOVW	12(R0), R2	// arg 3 mode
+	MOVW	R2, (RSP)	// arg 3 is variadic, pass on stack
 	MOVD	0(R0), R0	// arg 1 pathname
-	BL libc_open(SB)
+	BL	libc_open(SB)
+	ADD	$16, RSP
 	RET
 
 TEXT runtime·close_trampoline(SB),NOSPLIT,$0
@@ -283,10 +286,13 @@ ok:
 	RET
 
 TEXT runtime·fcntl_trampoline(SB),NOSPLIT,$0
+	SUB	$16, RSP
 	MOVW	4(R0), R1	// arg 2 cmd
 	MOVW	8(R0), R2	// arg 3 arg
+	MOVW	R2, (RSP)	// arg 3 is variadic, pass on stack
 	MOVW	0(R0), R0	// arg 1 fd
 	BL	libc_fcntl(SB)
+	ADD	$16, RSP
 	RET
 
 // sigaltstack on iOS is not supported and will always
@@ -372,3 +378,179 @@ TEXT runtime·pthread_cond_signal_trampoline(SB),NOSPLIT,$0
 	BL	libc_pthread_cond_signal(SB)
 	RET
 
+// syscall calls a function in libc on behalf of the syscall package.
+// syscall takes a pointer to a struct like:
+// struct {
+//	fn    uintptr
+//	a1    uintptr
+//	a2    uintptr
+//	a3    uintptr
+//	r1    uintptr
+//	r2    uintptr
+//	err   uintptr
+// }
+// syscall must be called on the g0 stack with the
+// C calling convention (use libcCall).
+TEXT runtime·syscall(SB),NOSPLIT,$0
+	SUB	$16, RSP	// push structure pointer
+	MOVD	R0, 8(RSP)
+
+	MOVD	0(R0), R12	// fn
+	MOVD	16(R0), R1	// a2
+	MOVD	24(R0), R2	// a3
+	MOVD	8(R0), R0	// a1
+
+	// If fn is declared as vararg, we have to pass the vararg arguments on the stack.
+	// (Because ios decided not to adhere to the standard arm64 calling convention, sigh...)
+	// The only libSystem calls we support that are vararg are open, fcntl, and ioctl,
+	// which are all of the form fn(x, y, ...). So we just need to put the 3rd arg
+	// on the stack as well.
+	// If we ever have other vararg libSystem calls, we might need to handle more cases.
+	MOVD	R2, (RSP)
+
+	BL	(R12)
+
+	MOVD	8(RSP), R2	// pop structure pointer
+	ADD	$16, RSP
+	MOVD	R0, 32(R2)	// save r1
+	MOVD	R1, 40(R2)	// save r2
+	CMPW	$-1, R0
+	BNE	ok
+	SUB	$16, RSP	// push structure pointer
+	MOVD	R2, 8(RSP)
+	BL	libc_error(SB)
+	MOVW	(R0), R0
+	MOVD	8(RSP), R2	// pop structure pointer
+	ADD	$16, RSP
+	MOVD	R0, 48(R2)	// save err
+ok:
+	RET
+
+// syscallX calls a function in libc on behalf of the syscall package.
+// syscallX takes a pointer to a struct like:
+// struct {
+//	fn    uintptr
+//	a1    uintptr
+//	a2    uintptr
+//	a3    uintptr
+//	r1    uintptr
+//	r2    uintptr
+//	err   uintptr
+// }
+// syscallX must be called on the g0 stack with the
+// C calling convention (use libcCall).
+TEXT runtime·syscallX(SB),NOSPLIT,$0
+	SUB	$16, RSP	// push structure pointer
+	MOVD	R0, (RSP)
+
+	MOVD	0(R0), R12	// fn
+	MOVD	16(R0), R1	// a2
+	MOVD	24(R0), R2	// a3
+	MOVD	8(R0), R0	// a1
+	BL	(R12)
+
+	MOVD	(RSP), R2	// pop structure pointer
+	ADD	$16, RSP
+	MOVD	R0, 32(R2)	// save r1
+	MOVD	R1, 40(R2)	// save r2
+	CMP	$-1, R0
+	BNE	ok
+	SUB	$16, RSP	// push structure pointer
+	MOVD	R2, (RSP)
+	BL	libc_error(SB)
+	MOVW	(R0), R0
+	MOVD	(RSP), R2	// pop structure pointer
+	ADD	$16, RSP
+	MOVD	R0, 48(R2)	// save err
+ok:
+	RET
+
+// syscall6 calls a function in libc on behalf of the syscall package.
+// syscall6 takes a pointer to a struct like:
+// struct {
+//	fn    uintptr
+//	a1    uintptr
+//	a2    uintptr
+//	a3    uintptr
+//	a4    uintptr
+//	a5    uintptr
+//	a6    uintptr
+//	r1    uintptr
+//	r2    uintptr
+//	err   uintptr
+// }
+// syscall6 must be called on the g0 stack with the
+// C calling convention (use libcCall).
+TEXT runtime·syscall6(SB),NOSPLIT,$0
+	SUB	$16, RSP	// push structure pointer
+	MOVD	R0, (RSP)
+
+	MOVD	0(R0), R12	// fn
+	MOVD	16(R0), R1	// a2
+	MOVD	24(R0), R2	// a3
+	MOVD	32(R0), R3	// a4
+	MOVD	40(R0), R4	// a5
+	MOVD	48(R0), R5	// a6
+	MOVD	8(R0), R0	// a1
+	BL	(R12)
+
+	MOVD	(RSP), R2	// pop structure pointer
+	ADD	$16, RSP
+	MOVD	R0, 56(R2)	// save r1
+	MOVD	R1, 64(R2)	// save r2
+	CMPW	$-1, R0
+	BNE	ok
+	SUB	$16, RSP	// push structure pointer
+	MOVD	R2, (RSP)
+	BL	libc_error(SB)
+	MOVW	(R0), R0
+	MOVD	(RSP), R2	// pop structure pointer
+	ADD	$16, RSP
+	MOVD	R0, 72(R2)	// save err
+ok:
+	RET
+
+// syscall6X calls a function in libc on behalf of the syscall package.
+// syscall6X takes a pointer to a struct like:
+// struct {
+//	fn    uintptr
+//	a1    uintptr
+//	a2    uintptr
+//	a3    uintptr
+//	a4    uintptr
+//	a5    uintptr
+//	a6    uintptr
+//	r1    uintptr
+//	r2    uintptr
+//	err   uintptr
+// }
+// syscall6X must be called on the g0 stack with the
+// C calling convention (use libcCall).
+TEXT runtime·syscall6X(SB),NOSPLIT,$0
+	SUB	$16, RSP	// push structure pointer
+	MOVD	R0, (RSP)
+
+	MOVD	0(R0), R12	// fn
+	MOVD	16(R0), R1	// a2
+	MOVD	24(R0), R2	// a3
+	MOVD	32(R0), R3	// a4
+	MOVD	40(R0), R4	// a5
+	MOVD	48(R0), R5	// a6
+	MOVD	8(R0), R0	// a1
+	BL	(R12)
+
+	MOVD	(RSP), R2	// pop structure pointer
+	ADD	$16, RSP
+	MOVD	R0, 56(R2)	// save r1
+	MOVD	R1, 64(R2)	// save r2
+	CMP	$-1, R0
+	BNE	ok
+	SUB	$16, RSP	// push structure pointer
+	MOVD	R2, (RSP)
+	BL	libc_error(SB)
+	MOVW	(R0), R0
+	MOVD	(RSP), R2	// pop structure pointer
+	ADD	$16, RSP
+	MOVD	R0, 72(R2)	// save err
+ok:
+	RET

src/syscall/exec_bsd.go

@@ -2,12 +2,11 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd netbsd openbsd
+// +build dragonfly freebsd netbsd openbsd
 
 package syscall
 
 import (
-	"runtime"
 	"unsafe"
 )
 
@@ -43,7 +42,7 @@ func forkAndExecInChild(argv0 *byte, argv, envv []*byte, chroot, dir *byte, attr
 	// Declare all variables at top in case any
 	// declarations require heap allocation (e.g., err1).
 	var (
-		r1, r2 uintptr
+		r1     uintptr
 		err1   Errno
 		nextfd int
 		i      int
@@ -62,25 +61,15 @@ func forkAndExecInChild(argv0 *byte, argv, envv []*byte, chroot, dir *byte, attr
 	}
 	nextfd++
 
-	darwin := runtime.GOOS == "darwin"
-
 	// About to call fork.
 	// No more allocation or calls of non-assembly functions.
 	runtime_BeforeFork()
-	r1, r2, err1 = RawSyscall(SYS_FORK, 0, 0, 0)
+	r1, _, err1 = RawSyscall(SYS_FORK, 0, 0, 0)
 	if err1 != 0 {
 		runtime_AfterFork()
 		return 0, err1
 	}
 
-	// On Darwin:
-	//	r1 = child pid in both parent and child.
-	//	r2 = 0 in parent, 1 in child.
-	// Convert to normal Unix r1 = 0 in child.
-	if darwin && r2 == 1 {
-		r1 = 0
-	}
-
 	if r1 != 0 {
 		// parent; return PID
 		runtime_AfterFork()

src/syscall/exec_darwin.go

+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package syscall
+
+import (
+	"unsafe"
+)
+
+type SysProcAttr struct {
+	Chroot     string      // Chroot.
+	Credential *Credential // Credential.
+	Ptrace     bool        // Enable tracing.
+	Setsid     bool        // Create session.
+	Setpgid    bool        // Set process group ID to Pgid, or, if Pgid == 0, to new pid.
+	Setctty    bool        // Set controlling terminal to fd Ctty
+	Noctty     bool        // Detach fd 0 from controlling terminal
+	Ctty       int         // Controlling TTY fd
+	Foreground bool        // Place child's process group in foreground. (Implies Setpgid. Uses Ctty as fd of controlling TTY)
+	Pgid       int         // Child's process group ID if Setpgid.
+}
+
+// Implemented in runtime package.
+func runtime_BeforeFork()
+func runtime_AfterFork()
+func runtime_AfterForkInChild()
+
+// Fork, dup fd onto 0..len(fd), and exec(argv0, argvv, envv) in child.
+// If a dup or exec fails, write the errno error to pipe.
+// (Pipe is close-on-exec so if exec succeeds, it will be closed.)
+// In the child, this function must not acquire any locks, because
+// they might have been locked at the time of the fork. This means
+// no rescheduling, no malloc calls, and no new stack segments.
+// For the same reason compiler does not race instrument it.
+// The calls to rawSyscall are okay because they are assembly
+// functions that do not grow the stack.
+//go:norace
+func forkAndExecInChild(argv0 *byte, argv, envv []*byte, chroot, dir *byte, attr *ProcAttr, sys *SysProcAttr, pipe int) (pid int, err Errno) {
+	// Declare all variables at top in case any
+	// declarations require heap allocation (e.g., err1).
+	var (
+		r1     uintptr
+		err1   Errno
+		nextfd int
+		i      int
+	)
+
+	// guard against side effects of shuffling fds below.
+	// Make sure that nextfd is beyond any currently open files so
+	// that we can't run the risk of overwriting any of them.
+	fd := make([]int, len(attr.Files))
+	nextfd = len(attr.Files)
+	for i, ufd := range attr.Files {
+		if nextfd < int(ufd) {
+			nextfd = int(ufd)
+		}
+		fd[i] = int(ufd)
+	}
+	nextfd++
+
+	// About to call fork.
+	// No more allocation or calls of non-assembly functions.
+	runtime_BeforeFork()
+	r1, _, err1 = rawSyscall(funcPC(libc_fork_trampoline), 0, 0, 0)
+	if err1 != 0 {
+		runtime_AfterFork()
+		return 0, err1
+	}
+
+	if r1 != 0 {
+		// parent; return PID
+		runtime_AfterFork()
+		return int(r1), 0
+	}
+
+	// Fork succeeded, now in child.
+
+	runtime_AfterForkInChild()
+
+	// Enable tracing if requested.
+	if sys.Ptrace {
+		_, _, err1 = rawSyscall(funcPC(libc_ptrace_trampoline), uintptr(PTRACE_TRACEME), 0, 0)
+		if err1 != 0 {
+			goto childerror
+		}
+	}
+
+	// Session ID
+	if sys.Setsid {
+		_, _, err1 = rawSyscall(funcPC(libc_setsid_trampoline), 0, 0, 0)
+		if err1 != 0 {
+			goto childerror
+		}
+	}
+
+	// Set process group
+	if sys.Setpgid || sys.Foreground {
+		// Place child in process group.
+		_, _, err1 = rawSyscall(funcPC(libc_setpgid_trampoline), 0, uintptr(sys.Pgid), 0)
+		if err1 != 0 {
+			goto childerror
+		}
+	}
+
+	if sys.Foreground {
+		pgrp := sys.Pgid
+		if pgrp == 0 {
+			r1, _, err1 = rawSyscall(funcPC(libc_getpid_trampoline), 0, 0, 0)
+			if err1 != 0 {
+				goto childerror
+			}
+
+			pgrp = int(r1)
+		}
+
+		// Place process group in foreground.
+		_, _, err1 = rawSyscall(funcPC(libc_ioctl_trampoline), uintptr(sys.Ctty), uintptr(TIOCSPGRP), uintptr(unsafe.Pointer(&pgrp)))
+		if err1 != 0 {
+			goto childerror
+		}
+	}
+
+	// Chroot
+	if chroot != nil {
+		_, _, err1 = rawSyscall(funcPC(libc_chroot_trampoline), uintptr(unsafe.Pointer(chroot)), 0, 0)
+		if err1 != 0 {
+			goto childerror
+		}
+	}
+
+	// User and groups
+	if cred := sys.Credential; cred != nil {
+		ngroups := uintptr(len(cred.Groups))
+		groups := uintptr(0)
+		if ngroups > 0 {
+			groups = uintptr(unsafe.Pointer(&cred.Groups[0]))
+		}
+		if !cred.NoSetGroups {
+			_, _, err1 = rawSyscall(funcPC(libc_setgroups_trampoline), ngroups, groups, 0)
+			if err1 != 0 {
+				goto childerror
+			}
+		}
+		_, _, err1 = rawSyscall(funcPC(libc_setgid_trampoline), uintptr(cred.Gid), 0, 0)
+		if err1 != 0 {
+			goto childerror
+		}
+		_, _, err1 = rawSyscall(funcPC(libc_setuid_trampoline), uintptr(cred.Uid), 0, 0)
+		if err1 != 0 {
+			goto childerror
+		}
+	}
+
+	// Chdir
+	if dir != nil {
+		_, _, err1 = rawSyscall(funcPC(libc_chdir_trampoline), uintptr(unsafe.Pointer(dir)), 0, 0)
+		if err1 != 0 {
+			goto childerror
+		}
+	}
+
+	// Pass 1: look for fd[i] < i and move those up above len(fd)
+	// so that pass 2 won't stomp on an fd it needs later.
+	if pipe < nextfd {
+		_, _, err1 = rawSyscall(funcPC(libc_dup2_trampoline), uintptr(pipe), uintptr(nextfd), 0)
+		if err1 != 0 {
+			goto childerror
+		}
+		rawSyscall(funcPC(libc_fcntl_trampoline), uintptr(nextfd), F_SETFD, FD_CLOEXEC)
+		pipe = nextfd
+		nextfd++
+	}
+	for i = 0; i < len(fd); i++ {
+		if fd[i] >= 0 && fd[i] < int(i) {
+			if nextfd == pipe { // don't stomp on pipe
+				nextfd++
+			}
+			_, _, err1 = rawSyscall(funcPC(libc_dup2_trampoline), uintptr(fd[i]), uintptr(nextfd), 0)
+			if err1 != 0 {
+				goto childerror
+			}
+			rawSyscall(funcPC(libc_fcntl_trampoline), uintptr(nextfd), F_SETFD, FD_CLOEXEC)
+			fd[i] = nextfd
+			nextfd++
+		}
+	}
+
+	// Pass 2: dup fd[i] down onto i.
+	for i = 0; i < len(fd); i++ {
+		if fd[i] == -1 {
+			rawSyscall(funcPC(libc_close_trampoline), uintptr(i), 0, 0)
+			continue
+		}
+		if fd[i] == int(i) {
+			// dup2(i, i) won't clear close-on-exec flag on Linux,
+			// probably not elsewhere either.
+			_, _, err1 = rawSyscall(funcPC(libc_fcntl_trampoline), uintptr(fd[i]), F_SETFD, 0)
+			if err1 != 0 {
+				goto childerror
+			}
+			continue
+		}
+		// The new fd is created NOT close-on-exec,
+		// which is exactly what we want.
+		_, _, err1 = rawSyscall(funcPC(libc_dup2_trampoline), uintptr(fd[i]), uintptr(i), 0)
+		if err1 != 0 {
+			goto childerror
+		}
+	}
+
+	// By convention, we don't close-on-exec the fds we are
+	// started with, so if len(fd) < 3, close 0, 1, 2 as needed.
+	// Programs that know they inherit fds >= 3 will need
+	// to set them close-on-exec.
+	for i = len(fd); i < 3; i++ {
+		rawSyscall(funcPC(libc_close_trampoline), uintptr(i), 0, 0)
+	}
+
+	// Detach fd 0 from tty
+	if sys.Noctty {
+		_, _, err1 = rawSyscall(funcPC(libc_ioctl_trampoline), 0, uintptr(TIOCNOTTY), 0)
+		if err1 != 0 {
+			goto childerror
+		}
+	}
+
+	// Set the controlling TTY to Ctty
+	if sys.Setctty {
+		_, _, err1 = rawSyscall(funcPC(libc_ioctl_trampoline), uintptr(sys.Ctty), uintptr(TIOCSCTTY), 0)
+		if err1 != 0 {
+			goto childerror
+		}
+	}
+
+	// Time to exec.
+	_, _, err1 = rawSyscall(funcPC(libc_execve_trampoline),
+		uintptr(unsafe.Pointer(argv0)),
+		uintptr(unsafe.Pointer(&argv[0])),
+		uintptr(unsafe.Pointer(&envv[0])))
+
+childerror:
+	// send error code on pipe
+	rawSyscall(funcPC(libc_write_trampoline), uintptr(pipe), uintptr(unsafe.Pointer(&err1)), unsafe.Sizeof(err1))
+	for {
+		rawSyscall(funcPC(libc_exit_trampoline), 253, 0, 0)
+	}
+}

src/syscall/mkall.sh

@@ -83,6 +83,7 @@ mksysctl=""
 zsysctl="zsysctl_$GOOSARCH.go"
 mksysnum=
 mktypes=
+mkasm=
 run="sh"
 
 case "$1" in
@@ -122,19 +123,31 @@ aix_ppc64)
 	;;
 darwin_386)
 	mkerrors="$mkerrors -m32"
-	mksyscall="./mksyscall.pl -l32"
+	mksyscall="./mksyscall.pl -l32 -darwin"
 	mksysnum="./mksysnum_darwin.pl /usr/include/sys/syscall.h"
 	mktypes="GOARCH=$GOARCH go tool cgo -godefs"
+	mkasm="go run mkasm_darwin.go"
 	;;
 darwin_amd64)
 	mkerrors="$mkerrors -m64"
+	mksyscall="./mksyscall.pl -darwin"
 	mksysnum="./mksysnum_darwin.pl /usr/include/sys/syscall.h"
 	mktypes="GOARCH=$GOARCH go tool cgo -godefs"
+	mkasm="go run mkasm_darwin.go"
 	;;
 darwin_arm64)
 	mkerrors="$mkerrors -m64"
+	mksyscall="./mksyscall.pl -darwin"
+	mksysnum="./mksysnum_darwin.pl /usr/include/sys/syscall.h"
+	mktypes="GOARCH=$GOARCH go tool cgo -godefs"
+	mkasm="go run mkasm_darwin.go"
+	;;
+darwin_arm)
+	mkerrors="$mkerrors -m32"
+	mksyscall="./mksyscall.pl -l32 -darwin"
 	mksysnum="./mksysnum_darwin.pl /usr/include/sys/syscall.h"
 	mktypes="GOARCH=$GOARCH go tool cgo -godefs"
+	mkasm="go run mkasm_darwin.go"
 	;;
 dragonfly_amd64)
 	mkerrors="$mkerrors -m64"
@@ -337,4 +350,5 @@ esac
 		# Therefore, "go run" tries to recompile syscall package but ztypes is empty and it fails.
 		echo "$mktypes types_$GOOS.go |go run mkpost.go >ztypes_$GOOSARCH.go.NEW && mv ztypes_$GOOSARCH.go.NEW ztypes_$GOOSARCH.go";
 	fi
+	if [ -n "$mkasm" ]; then echo "$mkasm $GOARCH"; fi
 ) | $run

src/syscall/mkasm_darwin.go

+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build ignore
+
+// mkasm_darwin.go generates assembly trampolines to call libSystem routines from Go.
+//This program must be run after mksyscall.pl.
+package main
+
+import (
+	"bytes"
+	"fmt"
+	"io/ioutil"
+	"log"
+	"os"
+	"strings"
+)
+
+func main() {
+	in1, err := ioutil.ReadFile("syscall_darwin.go")
+	if err != nil {
+		log.Fatalf("can't open syscall_darwin.go: %s", err)
+	}
+	arch := os.Args[1]
+	in2, err := ioutil.ReadFile(fmt.Sprintf("syscall_darwin_%s.go", arch))
+	if err != nil {
+		log.Fatalf("can't open syscall_darwin_%s.go: %s", arch, err)
+	}
+	in3, err := ioutil.ReadFile(fmt.Sprintf("zsyscall_darwin_%s.go", arch))
+	if err != nil {
+		log.Fatalf("can't open zsyscall_darwin_%s.go: %s", arch, err)
+	}
+	in := string(in1) + string(in2) + string(in3)
+
+	var out bytes.Buffer
+
+	fmt.Fprintf(&out, "// go run mkasm_darwin.go %s\n", strings.Join(os.Args[1:], " "))
+	fmt.Fprintf(&out, "// Code generated by the command above; DO NOT EDIT.\n")
+	fmt.Fprintf(&out, "#include \"textflag.h\"\n")
+	for _, line := range strings.Split(in, "\n") {
+		if !strings.HasPrefix(line, "func ") || !strings.HasSuffix(line, "_trampoline()") {
+			continue
+		}
+		fn := line[5 : len(line)-13]
+		fmt.Fprintf(&out, "TEXT ·%s_trampoline(SB),NOSPLIT,$0-0\n", fn)
+		fmt.Fprintf(&out, "\tJMP\t%s(SB)\n", fn)
+	}
+	err = ioutil.WriteFile(fmt.Sprintf("zsyscall_darwin_%s.s", arch), out.Bytes(), 0644)
+	if err != nil {
+		log.Fatalf("can't write zsyscall_darwin_%s.s: %s", arch, err)
+	}
+}

src/syscall/mksyscall.pl

@@ -25,6 +25,7 @@ my $cmdline = "mksyscall.pl " . join(' ', @ARGV);
 my $errors = 0;
 my $_32bit = "";
 my $plan9 = 0;
+my $darwin = 0;
 my $openbsd = 0;
 my $netbsd = 0;
 my $dragonfly = 0;
@@ -43,6 +44,10 @@ if($ARGV[0] eq "-plan9") {
 	$plan9 = 1;
 	shift;
 }
+if($ARGV[0] eq "-darwin") {
+	$darwin = 1;
+	shift;
+}
 if($ARGV[0] eq "-openbsd") {
 	$openbsd = 1;
 	shift;
@@ -211,6 +216,11 @@ while(<>) {
 			$asm = "RawSyscall";
 		}
 	}
+	if ($darwin) {
+		# Call unexported syscall functions (which take
+		# libc functions instead of syscall numbers).
+		$asm = lcfirst($asm);
+	}
 	if(@args <= 3) {
 		while(@args < 3) {
 			push @args, "0";
@@ -229,7 +239,16 @@ while(<>) {
 		print STDERR "$ARGV:$.: too many arguments to system call\n";
 	}
 
+	if ($darwin) {
+		# Use extended versions for calls that generate a 64-bit result.
+		my ($name, $type) = parseparam($out[0]);
+		if ($type eq "int64" || ($type eq "uintptr" && $_32bit eq "")) {
+			$asm .= "X";
+		}
+	}
+
 	# System call number.
+	my $funcname = "";
 	if($sysname eq "") {
 		$sysname = "SYS_$func";
 		$sysname =~ s/([a-z])([A-Z])/${1}_$2/g;	# turn FooBar into Foo_Bar
@@ -237,6 +256,18 @@ while(<>) {
 		if($nacl) {
 			$sysname =~ y/A-Z/a-z/;
 		}
+		if($darwin) {
+			$sysname =~ y/A-Z/a-z/;
+			$sysname = substr $sysname, 4;
+			$funcname = "libc_$sysname";
+		}
+	}
+	if($darwin) {
+		if($funcname eq "") {
+			$sysname = substr $sysname, 4;
+			$funcname = "libc_$sysname";
+		}
+		$sysname = "funcPC(${funcname}_trampoline)";
 	}
 
 	# Actual call.
@@ -306,6 +337,16 @@ while(<>) {
 	}
 	$text .= "\treturn\n";
 	$text .= "}\n\n";
+	if($darwin) {
+		# The assembly trampoline that jumps to the libc routine.
+		$text .= "func ${funcname}_trampoline()\n";
+		# Map syscall.funcname to just plain funcname.
+		# (The jump to this function is in the assembly trampoline, generated by mksyscallasm_darwin.go.)
+		$text .= "//go:linkname $funcname $funcname\n";
+		# Tell the linker that funcname can be found in libSystem using varname without the libc_ prefix.
+		my $basename = substr $funcname, 5;
+		$text .= "//go:cgo_import_dynamic $funcname $basename \"/usr/lib/libSystem.B.dylib\"\n";
+	}
 }
 
 chomp $text;

src/syscall/syscall_bsd.go

@@ -447,8 +447,6 @@ func Kevent(kq int, changes, events []Kevent_t, timeout *Timespec) (n int, err e
 	return kevent(kq, change, len(changes), event, len(events), timeout)
 }
 
-//sys	sysctl(mib []_C_int, old *byte, oldlen *uintptr, new *byte, newlen uintptr) (err error) = SYS___SYSCTL
-
 func Sysctl(name string) (value string, err error) {
 	// Translate name to mib number.
 	mib, err := nametomib(name)

src/syscall/syscall_darwin.go

@@ -120,8 +120,8 @@ func getAttrList(path string, attrList attrList, attrBuf []byte, options uint) (
 		return nil, err
 	}
 
-	_, _, e1 := Syscall6(
-		SYS_GETATTRLIST,
+	_, _, e1 := syscall6(
+		funcPC(libc_getattrlist_trampoline),
 		uintptr(unsafe.Pointer(_p0)),
 		uintptr(unsafe.Pointer(&attrList)),
 		uintptr(unsafe.Pointer(&attrBuf[0])),
@@ -163,13 +163,21 @@ func getAttrList(path string, attrList attrList, attrBuf []byte, options uint) (
 	return
 }
 
-//sysnb pipe() (r int, w int, err error)
+func libc_getattrlist_trampoline()
+
+//go:linkname libc_getattrlist libc_getattrlist
+//go:cgo_import_dynamic libc_getattrlist getattrlist "/usr/lib/libSystem.B.dylib"
+
+//sysnb pipe(p *[2]int32) (err error)
 
 func Pipe(p []int) (err error) {
 	if len(p) != 2 {
 		return EINVAL
 	}
-	p[0], p[1], err = pipe()
+	var q [2]int32
+	err = pipe(&q)
+	p[0] = int(q[0])
+	p[1] = int(q[1])
 	return
 }
 
@@ -180,7 +188,7 @@ func Getfsstat(buf []Statfs_t, flags int) (n int, err error) {
 		_p0 = unsafe.Pointer(&buf[0])
 		bufsize = unsafe.Sizeof(Statfs_t{}) * uintptr(len(buf))
 	}
-	r0, _, e1 := Syscall(SYS_GETFSSTAT64, uintptr(_p0), bufsize, uintptr(flags))
+	r0, _, e1 := syscall(funcPC(libc_getfsstat64_trampoline), uintptr(_p0), bufsize, uintptr(flags))
 	n = int(r0)
 	if e1 != 0 {
 		err = e1
@@ -188,6 +196,11 @@ func Getfsstat(buf []Statfs_t, flags int) (n int, err error) {
 	return
 }
 
+func libc_getfsstat64_trampoline()
+
+//go:linkname libc_getfsstat64 libc_getfsstat64
+//go:cgo_import_dynamic libc_getfsstat64 getfsstat64 "/usr/lib/libSystem.B.dylib"
+
 func setattrlistTimes(path string, times []Timespec) error {
 	_p0, err := BytePtrFromString(path)
 	if err != nil {
@@ -201,8 +214,8 @@ func setattrlistTimes(path string, times []Timespec) error {
 	// order is mtime, atime: the opposite of Chtimes
 	attributes := [2]Timespec{times[1], times[0]}
 	const options = 0
-	_, _, e1 := Syscall6(
-		SYS_SETATTRLIST,
+	_, _, e1 := syscall6(
+		funcPC(libc_setattrlist_trampoline),
 		uintptr(unsafe.Pointer(_p0)),
 		uintptr(unsafe.Pointer(&attrList)),
 		uintptr(unsafe.Pointer(&attributes)),
@@ -216,6 +229,11 @@ func setattrlistTimes(path string, times []Timespec) error {
 	return nil
 }
 
+func libc_setattrlist_trampoline()
+
+//go:linkname libc_setattrlist libc_setattrlist
+//go:cgo_import_dynamic libc_setattrlist setattrlist "/usr/lib/libSystem.B.dylib"
+
 func utimensat(dirfd int, path string, times *[2]Timespec, flag int) error {
 	// Darwin doesn't support SYS_UTIMENSAT
 	return ENOSYS
@@ -249,12 +267,12 @@ func Kill(pid int, signum Signal) (err error) { return kill(pid, int(signum), 1)
 //sys	Fchown(fd int, uid int, gid int) (err error)
 //sys	Flock(fd int, how int) (err error)
 //sys	Fpathconf(fd int, name int) (val int, err error)
-//sys	Fstat(fd int, stat *Stat_t) (err error) = SYS_FSTAT64
-//sys	Fstatfs(fd int, stat *Statfs_t) (err error) = SYS_FSTATFS64
+//sys	Fstat(fd int, stat *Stat_t) (err error) = SYS_fstat64
+//sys	Fstatfs(fd int, stat *Statfs_t) (err error) = SYS_fstatfs64
 //sys	Fsync(fd int) (err error)
 //  Fsync is not called for os.File.Sync(). Please see internal/poll/fd_fsync_darwin.go
 //sys	Ftruncate(fd int, length int64) (err error)
-//sys	Getdirentries(fd int, buf []byte, basep *uintptr) (n int, err error) = SYS_GETDIRENTRIES64
+//sys	Getdirentries(fd int, buf []byte, basep *uintptr) (n int, err error) = SYS___getdirentries64
 //sys	Getdtablesize() (size int)
 //sysnb	Getegid() (egid int)
 //sysnb	Geteuid() (uid int)
@@ -273,7 +291,7 @@ func Kill(pid int, signum Signal) (err error) { return kill(pid, int(signum), 1)
 //sys	Lchown(path string, uid int, gid int) (err error)
 //sys	Link(path string, link string) (err error)
 //sys	Listen(s int, backlog int) (err error)
-//sys	Lstat(path string, stat *Stat_t) (err error) = SYS_LSTAT64
+//sys	Lstat(path string, stat *Stat_t) (err error) = SYS_lstat64
 //sys	Mkdir(path string, mode uint32) (err error)
 //sys	Mkfifo(path string, mode uint32) (err error)
 //sys	Mknod(path string, mode uint32, dev int) (err error)
@@ -291,7 +309,7 @@ func Kill(pid int, signum Signal) (err error) { return kill(pid, int(signum), 1)
 //sys	Rename(from string, to string) (err error)
 //sys	Revoke(path string) (err error)
 //sys	Rmdir(path string) (err error)
-//sys	Seek(fd int, offset int64, whence int) (newoffset int64, err error) = SYS_LSEEK
+//sys	Seek(fd int, offset int64, whence int) (newoffset int64, err error) = SYS_lseek
 //sys	Select(n int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (err error)
 //sys	Setegid(egid int) (err error)
 //sysnb	Seteuid(euid int) (err error)
@@ -306,8 +324,8 @@ func Kill(pid int, signum Signal) (err error) { return kill(pid, int(signum), 1)
 //sysnb	Setsid() (pid int, err error)
 //sysnb	Settimeofday(tp *Timeval) (err error)
 //sysnb	Setuid(uid int) (err error)
-//sys	Stat(path string, stat *Stat_t) (err error) = SYS_STAT64
-//sys	Statfs(path string, stat *Statfs_t) (err error) = SYS_STATFS64
+//sys	Stat(path string, stat *Stat_t) (err error) = SYS_stat64
+//sys	Statfs(path string, stat *Statfs_t) (err error) = SYS_statfs64
 //sys	Symlink(path string, link string) (err error)
 //sys	Sync() (err error)
 //sys	Truncate(path string, length int64) (err error)
@@ -316,7 +334,43 @@ func Kill(pid int, signum Signal) (err error) { return kill(pid, int(signum), 1)
 //sys	Unlink(path string) (err error)
 //sys	Unmount(path string, flags int) (err error)
 //sys	write(fd int, p []byte) (n int, err error)
+//sys	writev(fd int, iovecs []Iovec) (cnt uintptr, err error)
 //sys   mmap(addr uintptr, length uintptr, prot int, flag int, fd int, pos int64) (ret uintptr, err error)
 //sys   munmap(addr uintptr, length uintptr) (err error)
-//sys	readlen(fd int, buf *byte, nbuf int) (n int, err error) = SYS_READ
-//sys	writelen(fd int, buf *byte, nbuf int) (n int, err error) = SYS_WRITE
+//sysnb fork() (pid int, err error)
+//sysnb ioctl(fd int, req int, arg int) (err error)
+//sysnb execve(path *byte, argv *byte, envp *byte) (err error)
+//sysnb exit(res int) (err error)
+//sys	sysctl(mib []_C_int, old *byte, oldlen *uintptr, new *byte, newlen uintptr) (err error)
+
+func readlen(fd int, buf *byte, nbuf int) (n int, err error) {
+	r0, _, e1 := syscall(funcPC(libc_read_trampoline), uintptr(fd), uintptr(unsafe.Pointer(buf)), uintptr(nbuf))
+	n = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+func writelen(fd int, buf *byte, nbuf int) (n int, err error) {
+	r0, _, e1 := syscall(funcPC(libc_write_trampoline), uintptr(fd), uintptr(unsafe.Pointer(buf)), uintptr(nbuf))
+	n = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// Implemented in the runtime package (runtime/sys_darwin.go)
+func syscall(fn, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno)
+func syscall6(fn, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno)
+func syscall6X(fn, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno)
+func rawSyscall(fn, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno)
+func rawSyscall6(fn, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno)
+
+// Find the entry point for f. See comments in runtime/proc.go for the
+// function of the same name.
+//go:nosplit
+func funcPC(f func()) uintptr {
+	return **(**uintptr)(unsafe.Pointer(&f))
+}

src/syscall/syscall_darwin_386.go

@@ -14,23 +14,7 @@ func setTimeval(sec, usec int64) Timeval {
 	return Timeval{Sec: int32(sec), Usec: int32(usec)}
 }
 
-//sysnb	gettimeofday(tp *Timeval) (sec int32, usec int32, err error)
-func Gettimeofday(tv *Timeval) error {
-	// The tv passed to gettimeofday must be non-nil.
-	// Before macOS Sierra (10.12), tv was otherwise unused and
-	// the answers came back in the two registers.
-	// As of Sierra, gettimeofday return zeros and populates
-	// tv itself.
-	sec, usec, err := gettimeofday(tv)
-	if err != nil {
-		return err
-	}
-	if sec != 0 || usec != 0 {
-		tv.Sec = int32(sec)
-		tv.Usec = int32(usec)
-	}
-	return nil
-}
+//sysnb	Gettimeofday(tp *Timeval) (err error)
 
 func SetKevent(k *Kevent_t, fd, mode, flags int) {
 	k.Ident = uint32(fd)
@@ -53,7 +37,7 @@ func (cmsg *Cmsghdr) SetLen(length int) {
 func sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) {
 	var length = uint64(count)
 
-	_, _, e1 := Syscall9(SYS_SENDFILE, uintptr(infd), uintptr(outfd), uintptr(*offset), uintptr(*offset>>32), uintptr(unsafe.Pointer(&length)), 0, 0, 0, 0)
+	_, _, e1 := Syscall9(funcPC(libc_sendfile_trampoline), uintptr(infd), uintptr(outfd), uintptr(*offset), uintptr(*offset>>32), uintptr(unsafe.Pointer(&length)), 0, 0, 0, 0)
 
 	written = int(length)
 
@@ -63,4 +47,12 @@ func sendfile(outfd int, infd int, offset *int64, count int) (written int, err e
 	return
 }
 
+func libc_sendfile_trampoline()
+
+//go:linkname libc_sendfile libc_sendfile
+//go:cgo_import_dynamic libc_sendfile sendfile "/usr/lib/libSystem.B.dylib"
+
+// Implemented in the runtime package (runtime/sys_darwin_32.go)
+func syscall9(fn, a1, a2, a3, a4, a5, a6, a7, a8, a9 uintptr) (r1, r2 uintptr, err Errno)
+
 func Syscall9(num, a1, a2, a3, a4, a5, a6, a7, a8, a9 uintptr) (r1, r2 uintptr, err Errno) // sic

src/syscall/syscall_darwin_amd64.go

@@ -14,23 +14,7 @@ func setTimeval(sec, usec int64) Timeval {
 	return Timeval{Sec: sec, Usec: int32(usec)}
 }
 
-//sysnb	gettimeofday(tp *Timeval) (sec int64, usec int32, err error)
-func Gettimeofday(tv *Timeval) error {
-	// The tv passed to gettimeofday must be non-nil.
-	// Before macOS Sierra (10.12), tv was otherwise unused and
-	// the answers came back in the two registers.
-	// As of Sierra, gettimeofday return zeros and populates
-	// tv itself.
-	sec, usec, err := gettimeofday(tv)
-	if err != nil {
-		return err
-	}
-	if sec != 0 || usec != 0 {
-		tv.Sec = sec
-		tv.Usec = usec
-	}
-	return nil
-}
+//sysnb	Gettimeofday(tp *Timeval) (err error)
 
 func SetKevent(k *Kevent_t, fd, mode, flags int) {
 	k.Ident = uint64(fd)
@@ -53,7 +37,7 @@ func (cmsg *Cmsghdr) SetLen(length int) {
 func sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) {
 	var length = uint64(count)
 
-	_, _, e1 := Syscall6(SYS_SENDFILE, uintptr(infd), uintptr(outfd), uintptr(*offset), uintptr(unsafe.Pointer(&length)), 0, 0)
+	_, _, e1 := syscall6(funcPC(libc_sendfile_trampoline), uintptr(infd), uintptr(outfd), uintptr(*offset), uintptr(unsafe.Pointer(&length)), 0, 0)
 
 	written = int(length)
 
@@ -63,4 +47,12 @@ func sendfile(outfd int, infd int, offset *int64, count int) (written int, err e
 	return
 }
 
+func libc_sendfile_trampoline()
+
+//go:linkname libc_sendfile libc_sendfile
+//go:cgo_import_dynamic libc_sendfile sendfile "/usr/lib/libSystem.B.dylib"
+
+// Implemented in the runtime package (runtime/sys_darwin_64.go)
+func syscallX(fn, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno)
+
 func Syscall9(trap, a1, a2, a3, a4, a5, a6, a7, a8, a9 uintptr) (r1, r2 uintptr, err Errno)

src/syscall/syscall_darwin_arm.go

@@ -14,21 +14,7 @@ func setTimeval(sec, usec int64) Timeval {
 	return Timeval{Sec: int32(sec), Usec: int32(usec)}
 }
 
-//sysnb	gettimeofday(tp *Timeval) (sec int32, usec int32, err error)
-func Gettimeofday(tv *Timeval) error {
-	// The tv passed to gettimeofday must be non-nil
-	// but is otherwise unused. The answers come back
-	// in the two registers.
-	sec, usec, err := gettimeofday(tv)
-	if err != nil {
-		return err
-	}
-	if sec != 0 || usec != 0 {
-		tv.Sec = int32(sec)
-		tv.Usec = int32(usec)
-	}
-	return nil
-}
+//sysnb	Gettimeofday(tp *Timeval) (err error)
 
 func SetKevent(k *Kevent_t, fd, mode, flags int) {
 	k.Ident = uint32(fd)
@@ -51,7 +37,7 @@ func (cmsg *Cmsghdr) SetLen(length int) {
 func sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) {
 	var length = uint64(count)
 
-	_, _, e1 := Syscall9(SYS_SENDFILE, uintptr(infd), uintptr(outfd), uintptr(*offset), uintptr(*offset>>32), uintptr(unsafe.Pointer(&length)), 0, 0, 0, 0)
+	_, _, e1 := Syscall9(funcPC(libc_sendfile_trampoline), uintptr(infd), uintptr(outfd), uintptr(*offset), uintptr(*offset>>32), uintptr(unsafe.Pointer(&length)), 0, 0, 0, 0)
 
 	written = int(length)
 
@@ -61,4 +47,12 @@ func sendfile(outfd int, infd int, offset *int64, count int) (written int, err e
 	return
 }
 
+func libc_sendfile_trampoline()
+
+//go:linkname libc_sendfile libc_sendfile
+//go:cgo_import_dynamic libc_sendfile sendfile "/usr/lib/libSystem.B.dylib"
+
+// Implemented in the runtime package (runtime/sys_darwin_32.go)
+func syscall9(fn, a1, a2, a3, a4, a5, a6, a7, a8, a9 uintptr) (r1, r2 uintptr, err Errno)
+
 func Syscall9(num, a1, a2, a3, a4, a5, a6, a7, a8, a9 uintptr) (r1, r2 uintptr, err Errno) // sic

src/syscall/syscall_darwin_arm64.go

@@ -14,21 +14,7 @@ func setTimeval(sec, usec int64) Timeval {
 	return Timeval{Sec: int64(sec), Usec: int32(usec)}
 }
 
-//sysnb	gettimeofday(tp *Timeval) (sec int64, usec int32, err error)
-func Gettimeofday(tv *Timeval) error {
-	// The tv passed to gettimeofday must be non-nil
-	// but is otherwise unused. The answers come back
-	// in the two registers.
-	sec, usec, err := gettimeofday(tv)
-	if err != nil {
-		return err
-	}
-	if sec != 0 || usec != 0 {
-		tv.Sec = sec
-		tv.Usec = usec
-	}
-	return nil
-}
+//sysnb	Gettimeofday(tp *Timeval) (err error)
 
 func SetKevent(k *Kevent_t, fd, mode, flags int) {
 	k.Ident = uint64(fd)
@@ -51,7 +37,7 @@ func (cmsg *Cmsghdr) SetLen(length int) {
 func sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) {
 	var length = uint64(count)
 
-	_, _, e1 := Syscall6(SYS_SENDFILE, uintptr(infd), uintptr(outfd), uintptr(*offset), uintptr(unsafe.Pointer(&length)), 0, 0)
+	_, _, e1 := syscall6(funcPC(libc_sendfile_trampoline), uintptr(infd), uintptr(outfd), uintptr(*offset), uintptr(unsafe.Pointer(&length)), 0, 0)
 
 	written = int(length)
 
@@ -61,4 +47,12 @@ func sendfile(outfd int, infd int, offset *int64, count int) (written int, err e
 	return
 }
 
+func libc_sendfile_trampoline()
+
+//go:linkname libc_sendfile libc_sendfile
+//go:cgo_import_dynamic libc_sendfile sendfile "/usr/lib/libSystem.B.dylib"
+
+// Implemented in the runtime package (runtime/sys_darwin_64.go)
+func syscallX(fn, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno)
+
 func Syscall9(num, a1, a2, a3, a4, a5, a6, a7, a8, a9 uintptr) (r1, r2 uintptr, err Errno) // sic

src/syscall/syscall_dragonfly.go

@@ -217,3 +217,4 @@ func setattrlistTimes(path string, times []Timespec) error {
 //sys	accept4(fd int, rsa *RawSockaddrAny, addrlen *_Socklen, flags int) (nfd int, err error)
 //sys	utimensat(dirfd int, path string, times *[2]Timespec, flag int) (err error)
 //sys	getcwd(buf []byte) (n int, err error) = SYS___GETCWD
+//sys	sysctl(mib []_C_int, old *byte, oldlen *uintptr, new *byte, newlen uintptr) (err error) = SYS___SYSCTL

src/syscall/syscall_freebsd.go

@@ -492,3 +492,4 @@ func convertFromDirents11(buf []byte, old []byte) int {
 //sys	accept4(fd int, rsa *RawSockaddrAny, addrlen *_Socklen, flags int) (nfd int, err error)
 //sys	utimensat(dirfd int, path string, times *[2]Timespec, flag int) (err error)
 //sys	getcwd(buf []byte) (n int, err error) = SYS___GETCWD
+//sys	sysctl(mib []_C_int, old *byte, oldlen *uintptr, new *byte, newlen uintptr) (err error) = SYS___SYSCTL

src/syscall/syscall_netbsd.go

@@ -52,7 +52,6 @@ func sysctlNodes(mib []_C_int) (nodes []Sysctlnode, err error) {
 }
 
 func nametomib(name string) (mib []_C_int, err error) {
-
 	// Split name into components.
 	var parts []string
 	last := 0
@@ -234,3 +233,4 @@ func setattrlistTimes(path string, times []Timespec) error {
 //sys	writelen(fd int, buf *byte, nbuf int) (n int, err error) = SYS_WRITE
 //sys	utimensat(dirfd int, path string, times *[2]Timespec, flag int) (err error)
 //sys	getcwd(buf []byte) (n int, err error) = SYS___GETCWD
+//sys	sysctl(mib []_C_int, old *byte, oldlen *uintptr, new *byte, newlen uintptr) (err error) = SYS___SYSCTL

src/syscall/syscall_openbsd.go

@@ -29,7 +29,6 @@ type SockaddrDatalink struct {
 func Syscall9(num, a1, a2, a3, a4, a5, a6, a7, a8, a9 uintptr) (r1, r2 uintptr, err Errno)
 
 func nametomib(name string) (mib []_C_int, err error) {
-
 	// Perform lookup via a binary search
 	left := 0
 	right := len(sysctlMib) - 1
@@ -212,3 +211,4 @@ func setattrlistTimes(path string, times []Timespec) error {
 //sys	writelen(fd int, buf *byte, nbuf int) (n int, err error) = SYS_WRITE
 //sys	utimensat(dirfd int, path string, times *[2]Timespec, flag int) (err error)
 //sys	getcwd(buf []byte) (n int, err error) = SYS___GETCWD
+//sys	sysctl(mib []_C_int, old *byte, oldlen *uintptr, new *byte, newlen uintptr) (err error) = SYS___SYSCTL

src/syscall/syscall_unix_test.go

@@ -315,6 +315,12 @@ func TestRlimit(t *testing.T) {
 	}
 	set := rlimit
 	set.Cur = set.Max - 1
+	if runtime.GOOS == "darwin" && set.Cur > 10240 {
+		// The max file limit is 10240, even though
+		// the max returned by Getrlimit is 1<<63-1.
+		// This is OPEN_MAX in sys/syslimits.h.
+		set.Cur = 10240
+	}
 	err = syscall.Setrlimit(syscall.RLIMIT_NOFILE, &set)
 	if err != nil {
 		t.Fatalf("Setrlimit: set failed: %#v %v", set, err)
@@ -326,15 +332,11 @@ func TestRlimit(t *testing.T) {
 	}
 	set = rlimit
 	set.Cur = set.Max - 1
+	if runtime.GOOS == "darwin" && set.Cur > 10240 {
+		set.Cur = 10240
+	}
 	if set != get {
-		// Seems like Darwin requires some privilege to
-		// increase the soft limit of rlimit sandbox, though
-		// Setrlimit never reports an error.
-		switch runtime.GOOS {
-		case "darwin":
-		default:
-			t.Fatalf("Rlimit: change failed: wanted %#v got %#v", set, get)
-		}
+		t.Fatalf("Rlimit: change failed: wanted %#v got %#v", set, get)
 	}
 	err = syscall.Setrlimit(syscall.RLIMIT_NOFILE, &rlimit)
 	if err != nil {

src/syscall/zsyscall_darwin_386.s

+// go run mkasm_darwin.go 386
+// Code generated by the command above; DO NOT EDIT.
+#include "textflag.h"
+TEXT ·libc_getattrlist_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getattrlist(SB)
+TEXT ·libc_getfsstat64_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getfsstat64(SB)
+TEXT ·libc_setattrlist_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_setattrlist(SB)
+TEXT ·libc_sendfile_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_sendfile(SB)
+TEXT ·libc_getgroups_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getgroups(SB)
+TEXT ·libc_setgroups_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_setgroups(SB)
+TEXT ·libc_wait4_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_wait4(SB)
+TEXT ·libc_accept_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_accept(SB)
+TEXT ·libc_bind_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_bind(SB)
+TEXT ·libc_connect_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_connect(SB)
+TEXT ·libc_socket_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_socket(SB)
+TEXT ·libc_getsockopt_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getsockopt(SB)
+TEXT ·libc_setsockopt_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_setsockopt(SB)
+TEXT ·libc_getpeername_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getpeername(SB)
+TEXT ·libc_getsockname_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getsockname(SB)
+TEXT ·libc_shutdown_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_shutdown(SB)
+TEXT ·libc_socketpair_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_socketpair(SB)
+TEXT ·libc_recvfrom_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_recvfrom(SB)
+TEXT ·libc_sendto_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_sendto(SB)
+TEXT ·libc_recvmsg_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_recvmsg(SB)
+TEXT ·libc_sendmsg_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_sendmsg(SB)
+TEXT ·libc_kevent_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_kevent(SB)
+TEXT ·libc_utimes_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_utimes(SB)
+TEXT ·libc_futimes_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_futimes(SB)
+TEXT ·libc_fcntl_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_fcntl(SB)
+TEXT ·libc_ptrace_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_ptrace(SB)
+TEXT ·libc_pipe_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_pipe(SB)
+TEXT ·libc_kill_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_kill(SB)
+TEXT ·libc_access_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_access(SB)
+TEXT ·libc_adjtime_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_adjtime(SB)
+TEXT ·libc_chdir_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_chdir(SB)
+TEXT ·libc_chflags_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_chflags(SB)
+TEXT ·libc_chmod_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_chmod(SB)
+TEXT ·libc_chown_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_chown(SB)
+TEXT ·libc_chroot_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_chroot(SB)
+TEXT ·libc_close_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_close(SB)
+TEXT ·libc_dup_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_dup(SB)
+TEXT ·libc_dup2_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_dup2(SB)
+TEXT ·libc_exchangedata_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_exchangedata(SB)
+TEXT ·libc_fchdir_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_fchdir(SB)
+TEXT ·libc_fchflags_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_fchflags(SB)
+TEXT ·libc_fchmod_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_fchmod(SB)
+TEXT ·libc_fchown_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_fchown(SB)
+TEXT ·libc_flock_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_flock(SB)
+TEXT ·libc_fpathconf_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_fpathconf(SB)
+TEXT ·libc_fstat64_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_fstat64(SB)
+TEXT ·libc_fstatfs64_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_fstatfs64(SB)
+TEXT ·libc_fsync_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_fsync(SB)
+TEXT ·libc_ftruncate_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_ftruncate(SB)
+TEXT ·libc___getdirentries64_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc___getdirentries64(SB)
+TEXT ·libc_getdtablesize_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getdtablesize(SB)
+TEXT ·libc_getegid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getegid(SB)
+TEXT ·libc_geteuid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_geteuid(SB)
+TEXT ·libc_getgid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getgid(SB)
+TEXT ·libc_getpgid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getpgid(SB)
+TEXT ·libc_getpgrp_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getpgrp(SB)
+TEXT ·libc_getpid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getpid(SB)
+TEXT ·libc_getppid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getppid(SB)
+TEXT ·libc_getpriority_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getpriority(SB)
+TEXT ·libc_getrlimit_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getrlimit(SB)
+TEXT ·libc_getrusage_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getrusage(SB)
+TEXT ·libc_getsid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getsid(SB)
+TEXT ·libc_getuid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getuid(SB)
+TEXT ·libc_issetugid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_issetugid(SB)
+TEXT ·libc_kqueue_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_kqueue(SB)
+TEXT ·libc_lchown_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_lchown(SB)
+TEXT ·libc_link_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_link(SB)
+TEXT ·libc_listen_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_listen(SB)
+TEXT ·libc_lstat64_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_lstat64(SB)
+TEXT ·libc_mkdir_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_mkdir(SB)
+TEXT ·libc_mkfifo_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_mkfifo(SB)
+TEXT ·libc_mknod_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_mknod(SB)
+TEXT ·libc_mlock_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_mlock(SB)
+TEXT ·libc_mlockall_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_mlockall(SB)
+TEXT ·libc_mprotect_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_mprotect(SB)
+TEXT ·libc_munlock_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_munlock(SB)
+TEXT ·libc_munlockall_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_munlockall(SB)
+TEXT ·libc_open_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_open(SB)
+TEXT ·libc_pathconf_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_pathconf(SB)
+TEXT ·libc_pread_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_pread(SB)
+TEXT ·libc_pwrite_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_pwrite(SB)
+TEXT ·libc_read_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_read(SB)
+TEXT ·libc_readlink_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_readlink(SB)
+TEXT ·libc_rename_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_rename(SB)
+TEXT ·libc_revoke_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_revoke(SB)
+TEXT ·libc_rmdir_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_rmdir(SB)
+TEXT ·libc_lseek_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_lseek(SB)
+TEXT ·libc_select_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_select(SB)
+TEXT ·libc_setegid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_setegid(SB)
+TEXT ·libc_seteuid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_seteuid(SB)
+TEXT ·libc_setgid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_setgid(SB)
+TEXT ·libc_setlogin_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_setlogin(SB)
+TEXT ·libc_setpgid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_setpgid(SB)
+TEXT ·libc_setpriority_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_setpriority(SB)
+TEXT ·libc_setprivexec_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_setprivexec(SB)
+TEXT ·libc_setregid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_setregid(SB)
+TEXT ·libc_setreuid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_setreuid(SB)
+TEXT ·libc_setrlimit_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_setrlimit(SB)
+TEXT ·libc_setsid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_setsid(SB)
+TEXT ·libc_settimeofday_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_settimeofday(SB)
+TEXT ·libc_setuid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_setuid(SB)
+TEXT ·libc_stat64_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_stat64(SB)
+TEXT ·libc_statfs64_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_statfs64(SB)
+TEXT ·libc_symlink_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_symlink(SB)
+TEXT ·libc_sync_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_sync(SB)
+TEXT ·libc_truncate_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_truncate(SB)
+TEXT ·libc_umask_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_umask(SB)
+TEXT ·libc_undelete_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_undelete(SB)
+TEXT ·libc_unlink_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_unlink(SB)
+TEXT ·libc_unmount_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_unmount(SB)
+TEXT ·libc_write_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_write(SB)
+TEXT ·libc_mmap_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_mmap(SB)
+TEXT ·libc_munmap_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_munmap(SB)
+TEXT ·libc_fork_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_fork(SB)
+TEXT ·libc_ioctl_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_ioctl(SB)
+TEXT ·libc_execve_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_execve(SB)
+TEXT ·libc_exit_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_exit(SB)
+TEXT ·libc_sysctl_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_sysctl(SB)
+TEXT ·libc_writev_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_writev(SB)
+TEXT ·libc_gettimeofday_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_gettimeofday(SB)

src/syscall/zsyscall_darwin_amd64.s

+// go run mkasm_darwin.go amd64
+// Code generated by the command above; DO NOT EDIT.
+#include "textflag.h"
+TEXT ·libc_getattrlist_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getattrlist(SB)
+TEXT ·libc_getfsstat64_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getfsstat64(SB)
+TEXT ·libc_setattrlist_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_setattrlist(SB)
+TEXT ·libc_sendfile_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_sendfile(SB)
+TEXT ·libc_getgroups_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getgroups(SB)
+TEXT ·libc_setgroups_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_setgroups(SB)
+TEXT ·libc_wait4_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_wait4(SB)
+TEXT ·libc_accept_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_accept(SB)
+TEXT ·libc_bind_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_bind(SB)
+TEXT ·libc_connect_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_connect(SB)
+TEXT ·libc_socket_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_socket(SB)
+TEXT ·libc_getsockopt_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getsockopt(SB)
+TEXT ·libc_setsockopt_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_setsockopt(SB)
+TEXT ·libc_getpeername_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getpeername(SB)
+TEXT ·libc_getsockname_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getsockname(SB)
+TEXT ·libc_shutdown_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_shutdown(SB)
+TEXT ·libc_socketpair_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_socketpair(SB)
+TEXT ·libc_recvfrom_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_recvfrom(SB)
+TEXT ·libc_sendto_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_sendto(SB)
+TEXT ·libc_recvmsg_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_recvmsg(SB)
+TEXT ·libc_sendmsg_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_sendmsg(SB)
+TEXT ·libc_kevent_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_kevent(SB)
+TEXT ·libc_utimes_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_utimes(SB)
+TEXT ·libc_futimes_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_futimes(SB)
+TEXT ·libc_fcntl_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_fcntl(SB)
+TEXT ·libc_ptrace_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_ptrace(SB)
+TEXT ·libc_pipe_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_pipe(SB)
+TEXT ·libc_kill_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_kill(SB)
+TEXT ·libc_access_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_access(SB)
+TEXT ·libc_adjtime_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_adjtime(SB)
+TEXT ·libc_chdir_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_chdir(SB)
+TEXT ·libc_chflags_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_chflags(SB)
+TEXT ·libc_chmod_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_chmod(SB)
+TEXT ·libc_chown_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_chown(SB)
+TEXT ·libc_chroot_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_chroot(SB)
+TEXT ·libc_close_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_close(SB)
+TEXT ·libc_dup_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_dup(SB)
+TEXT ·libc_dup2_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_dup2(SB)
+TEXT ·libc_exchangedata_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_exchangedata(SB)
+TEXT ·libc_fchdir_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_fchdir(SB)
+TEXT ·libc_fchflags_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_fchflags(SB)
+TEXT ·libc_fchmod_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_fchmod(SB)
+TEXT ·libc_fchown_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_fchown(SB)
+TEXT ·libc_flock_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_flock(SB)
+TEXT ·libc_fpathconf_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_fpathconf(SB)
+TEXT ·libc_fstat64_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_fstat64(SB)
+TEXT ·libc_fstatfs64_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_fstatfs64(SB)
+TEXT ·libc_fsync_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_fsync(SB)
+TEXT ·libc_ftruncate_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_ftruncate(SB)
+TEXT ·libc___getdirentries64_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc___getdirentries64(SB)
+TEXT ·libc_getdtablesize_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getdtablesize(SB)
+TEXT ·libc_getegid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getegid(SB)
+TEXT ·libc_geteuid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_geteuid(SB)
+TEXT ·libc_getgid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getgid(SB)
+TEXT ·libc_getpgid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getpgid(SB)
+TEXT ·libc_getpgrp_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getpgrp(SB)
+TEXT ·libc_getpid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getpid(SB)
+TEXT ·libc_getppid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getppid(SB)
+TEXT ·libc_getpriority_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getpriority(SB)
+TEXT ·libc_getrlimit_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getrlimit(SB)
+TEXT ·libc_getrusage_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getrusage(SB)
+TEXT ·libc_getsid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getsid(SB)
+TEXT ·libc_getuid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getuid(SB)
+TEXT ·libc_issetugid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_issetugid(SB)
+TEXT ·libc_kqueue_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_kqueue(SB)
+TEXT ·libc_lchown_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_lchown(SB)
+TEXT ·libc_link_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_link(SB)
+TEXT ·libc_listen_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_listen(SB)
+TEXT ·libc_lstat64_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_lstat64(SB)
+TEXT ·libc_mkdir_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_mkdir(SB)
+TEXT ·libc_mkfifo_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_mkfifo(SB)
+TEXT ·libc_mknod_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_mknod(SB)
+TEXT ·libc_mlock_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_mlock(SB)
+TEXT ·libc_mlockall_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_mlockall(SB)
+TEXT ·libc_mprotect_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_mprotect(SB)
+TEXT ·libc_munlock_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_munlock(SB)
+TEXT ·libc_munlockall_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_munlockall(SB)
+TEXT ·libc_open_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_open(SB)
+TEXT ·libc_pathconf_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_pathconf(SB)
+TEXT ·libc_pread_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_pread(SB)
+TEXT ·libc_pwrite_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_pwrite(SB)
+TEXT ·libc_read_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_read(SB)
+TEXT ·libc_readlink_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_readlink(SB)
+TEXT ·libc_rename_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_rename(SB)
+TEXT ·libc_revoke_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_revoke(SB)
+TEXT ·libc_rmdir_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_rmdir(SB)
+TEXT ·libc_lseek_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_lseek(SB)
+TEXT ·libc_select_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_select(SB)
+TEXT ·libc_setegid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_setegid(SB)
+TEXT ·libc_seteuid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_seteuid(SB)
+TEXT ·libc_setgid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_setgid(SB)
+TEXT ·libc_setlogin_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_setlogin(SB)
+TEXT ·libc_setpgid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_setpgid(SB)
+TEXT ·libc_setpriority_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_setpriority(SB)
+TEXT ·libc_setprivexec_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_setprivexec(SB)
+TEXT ·libc_setregid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_setregid(SB)
+TEXT ·libc_setreuid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_setreuid(SB)
+TEXT ·libc_setrlimit_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_setrlimit(SB)
+TEXT ·libc_setsid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_setsid(SB)
+TEXT ·libc_settimeofday_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_settimeofday(SB)
+TEXT ·libc_setuid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_setuid(SB)
+TEXT ·libc_stat64_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_stat64(SB)
+TEXT ·libc_statfs64_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_statfs64(SB)
+TEXT ·libc_symlink_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_symlink(SB)
+TEXT ·libc_sync_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_sync(SB)
+TEXT ·libc_truncate_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_truncate(SB)
+TEXT ·libc_umask_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_umask(SB)
+TEXT ·libc_undelete_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_undelete(SB)
+TEXT ·libc_unlink_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_unlink(SB)
+TEXT ·libc_unmount_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_unmount(SB)
+TEXT ·libc_write_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_write(SB)
+TEXT ·libc_mmap_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_mmap(SB)
+TEXT ·libc_munmap_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_munmap(SB)
+TEXT ·libc_fork_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_fork(SB)
+TEXT ·libc_ioctl_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_ioctl(SB)
+TEXT ·libc_execve_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_execve(SB)
+TEXT ·libc_exit_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_exit(SB)
+TEXT ·libc_sysctl_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_sysctl(SB)
+TEXT ·libc_writev_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_writev(SB)
+TEXT ·libc_gettimeofday_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_gettimeofday(SB)

src/syscall/zsyscall_darwin_arm.s

+// go run mkasm_darwin.go arm
+// Code generated by the command above; DO NOT EDIT.
+#include "textflag.h"
+TEXT ·libc_getattrlist_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getattrlist(SB)
+TEXT ·libc_getfsstat64_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getfsstat64(SB)
+TEXT ·libc_setattrlist_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_setattrlist(SB)
+TEXT ·libc_sendfile_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_sendfile(SB)
+TEXT ·libc_getgroups_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getgroups(SB)
+TEXT ·libc_setgroups_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_setgroups(SB)
+TEXT ·libc_wait4_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_wait4(SB)
+TEXT ·libc_accept_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_accept(SB)
+TEXT ·libc_bind_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_bind(SB)
+TEXT ·libc_connect_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_connect(SB)
+TEXT ·libc_socket_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_socket(SB)
+TEXT ·libc_getsockopt_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getsockopt(SB)
+TEXT ·libc_setsockopt_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_setsockopt(SB)
+TEXT ·libc_getpeername_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getpeername(SB)
+TEXT ·libc_getsockname_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getsockname(SB)
+TEXT ·libc_shutdown_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_shutdown(SB)
+TEXT ·libc_socketpair_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_socketpair(SB)
+TEXT ·libc_recvfrom_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_recvfrom(SB)
+TEXT ·libc_sendto_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_sendto(SB)
+TEXT ·libc_recvmsg_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_recvmsg(SB)
+TEXT ·libc_sendmsg_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_sendmsg(SB)
+TEXT ·libc_kevent_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_kevent(SB)
+TEXT ·libc_utimes_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_utimes(SB)
+TEXT ·libc_futimes_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_futimes(SB)
+TEXT ·libc_fcntl_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_fcntl(SB)
+TEXT ·libc_ptrace_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_ptrace(SB)
+TEXT ·libc_pipe_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_pipe(SB)
+TEXT ·libc_kill_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_kill(SB)
+TEXT ·libc_access_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_access(SB)
+TEXT ·libc_adjtime_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_adjtime(SB)
+TEXT ·libc_chdir_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_chdir(SB)
+TEXT ·libc_chflags_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_chflags(SB)
+TEXT ·libc_chmod_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_chmod(SB)
+TEXT ·libc_chown_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_chown(SB)
+TEXT ·libc_chroot_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_chroot(SB)
+TEXT ·libc_close_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_close(SB)
+TEXT ·libc_dup_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_dup(SB)
+TEXT ·libc_dup2_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_dup2(SB)
+TEXT ·libc_exchangedata_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_exchangedata(SB)
+TEXT ·libc_fchdir_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_fchdir(SB)
+TEXT ·libc_fchflags_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_fchflags(SB)
+TEXT ·libc_fchmod_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_fchmod(SB)
+TEXT ·libc_fchown_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_fchown(SB)
+TEXT ·libc_flock_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_flock(SB)
+TEXT ·libc_fpathconf_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_fpathconf(SB)
+TEXT ·libc_fstat64_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_fstat64(SB)
+TEXT ·libc_fstatfs64_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_fstatfs64(SB)
+TEXT ·libc_fsync_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_fsync(SB)
+TEXT ·libc_ftruncate_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_ftruncate(SB)
+TEXT ·libc___getdirentries64_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc___getdirentries64(SB)
+TEXT ·libc_getdtablesize_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getdtablesize(SB)
+TEXT ·libc_getegid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getegid(SB)
+TEXT ·libc_geteuid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_geteuid(SB)
+TEXT ·libc_getgid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getgid(SB)
+TEXT ·libc_getpgid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getpgid(SB)
+TEXT ·libc_getpgrp_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getpgrp(SB)
+TEXT ·libc_getpid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getpid(SB)
+TEXT ·libc_getppid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getppid(SB)
+TEXT ·libc_getpriority_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getpriority(SB)
+TEXT ·libc_getrlimit_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getrlimit(SB)
+TEXT ·libc_getrusage_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getrusage(SB)
+TEXT ·libc_getsid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getsid(SB)
+TEXT ·libc_getuid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getuid(SB)
+TEXT ·libc_issetugid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_issetugid(SB)
+TEXT ·libc_kqueue_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_kqueue(SB)
+TEXT ·libc_lchown_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_lchown(SB)
+TEXT ·libc_link_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_link(SB)
+TEXT ·libc_listen_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_listen(SB)
+TEXT ·libc_lstat64_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_lstat64(SB)
+TEXT ·libc_mkdir_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_mkdir(SB)
+TEXT ·libc_mkfifo_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_mkfifo(SB)
+TEXT ·libc_mknod_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_mknod(SB)
+TEXT ·libc_mlock_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_mlock(SB)
+TEXT ·libc_mlockall_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_mlockall(SB)
+TEXT ·libc_mprotect_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_mprotect(SB)
+TEXT ·libc_munlock_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_munlock(SB)
+TEXT ·libc_munlockall_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_munlockall(SB)
+TEXT ·libc_open_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_open(SB)
+TEXT ·libc_pathconf_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_pathconf(SB)
+TEXT ·libc_pread_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_pread(SB)
+TEXT ·libc_pwrite_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_pwrite(SB)
+TEXT ·libc_read_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_read(SB)
+TEXT ·libc_readlink_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_readlink(SB)
+TEXT ·libc_rename_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_rename(SB)
+TEXT ·libc_revoke_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_revoke(SB)
+TEXT ·libc_rmdir_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_rmdir(SB)
+TEXT ·libc_lseek_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_lseek(SB)
+TEXT ·libc_select_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_select(SB)
+TEXT ·libc_setegid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_setegid(SB)
+TEXT ·libc_seteuid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_seteuid(SB)
+TEXT ·libc_setgid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_setgid(SB)
+TEXT ·libc_setlogin_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_setlogin(SB)
+TEXT ·libc_setpgid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_setpgid(SB)
+TEXT ·libc_setpriority_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_setpriority(SB)
+TEXT ·libc_setprivexec_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_setprivexec(SB)
+TEXT ·libc_setregid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_setregid(SB)
+TEXT ·libc_setreuid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_setreuid(SB)
+TEXT ·libc_setrlimit_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_setrlimit(SB)
+TEXT ·libc_setsid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_setsid(SB)
+TEXT ·libc_settimeofday_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_settimeofday(SB)
+TEXT ·libc_setuid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_setuid(SB)
+TEXT ·libc_stat64_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_stat64(SB)
+TEXT ·libc_statfs64_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_statfs64(SB)
+TEXT ·libc_symlink_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_symlink(SB)
+TEXT ·libc_sync_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_sync(SB)
+TEXT ·libc_truncate_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_truncate(SB)
+TEXT ·libc_umask_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_umask(SB)
+TEXT ·libc_undelete_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_undelete(SB)
+TEXT ·libc_unlink_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_unlink(SB)
+TEXT ·libc_unmount_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_unmount(SB)
+TEXT ·libc_write_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_write(SB)
+TEXT ·libc_mmap_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_mmap(SB)
+TEXT ·libc_munmap_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_munmap(SB)
+TEXT ·libc_fork_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_fork(SB)
+TEXT ·libc_ioctl_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_ioctl(SB)
+TEXT ·libc_execve_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_execve(SB)
+TEXT ·libc_exit_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_exit(SB)
+TEXT ·libc_sysctl_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_sysctl(SB)
+TEXT ·libc_writev_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_writev(SB)
+TEXT ·libc_gettimeofday_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_gettimeofday(SB)

src/syscall/zsyscall_darwin_arm64.s

+// go run mkasm_darwin.go arm64
+// Code generated by the command above; DO NOT EDIT.
+#include "textflag.h"
+TEXT ·libc_getattrlist_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getattrlist(SB)
+TEXT ·libc_getfsstat64_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getfsstat64(SB)
+TEXT ·libc_setattrlist_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_setattrlist(SB)
+TEXT ·libc_sendfile_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_sendfile(SB)
+TEXT ·libc_getgroups_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getgroups(SB)
+TEXT ·libc_setgroups_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_setgroups(SB)
+TEXT ·libc_wait4_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_wait4(SB)
+TEXT ·libc_accept_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_accept(SB)
+TEXT ·libc_bind_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_bind(SB)
+TEXT ·libc_connect_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_connect(SB)
+TEXT ·libc_socket_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_socket(SB)
+TEXT ·libc_getsockopt_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getsockopt(SB)
+TEXT ·libc_setsockopt_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_setsockopt(SB)
+TEXT ·libc_getpeername_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getpeername(SB)
+TEXT ·libc_getsockname_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getsockname(SB)
+TEXT ·libc_shutdown_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_shutdown(SB)
+TEXT ·libc_socketpair_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_socketpair(SB)
+TEXT ·libc_recvfrom_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_recvfrom(SB)
+TEXT ·libc_sendto_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_sendto(SB)
+TEXT ·libc_recvmsg_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_recvmsg(SB)
+TEXT ·libc_sendmsg_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_sendmsg(SB)
+TEXT ·libc_kevent_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_kevent(SB)
+TEXT ·libc_utimes_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_utimes(SB)
+TEXT ·libc_futimes_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_futimes(SB)
+TEXT ·libc_fcntl_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_fcntl(SB)
+TEXT ·libc_ptrace_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_ptrace(SB)
+TEXT ·libc_pipe_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_pipe(SB)
+TEXT ·libc_kill_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_kill(SB)
+TEXT ·libc_access_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_access(SB)
+TEXT ·libc_adjtime_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_adjtime(SB)
+TEXT ·libc_chdir_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_chdir(SB)
+TEXT ·libc_chflags_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_chflags(SB)
+TEXT ·libc_chmod_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_chmod(SB)
+TEXT ·libc_chown_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_chown(SB)
+TEXT ·libc_chroot_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_chroot(SB)
+TEXT ·libc_close_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_close(SB)
+TEXT ·libc_dup_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_dup(SB)
+TEXT ·libc_dup2_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_dup2(SB)
+TEXT ·libc_exchangedata_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_exchangedata(SB)
+TEXT ·libc_fchdir_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_fchdir(SB)
+TEXT ·libc_fchflags_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_fchflags(SB)
+TEXT ·libc_fchmod_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_fchmod(SB)
+TEXT ·libc_fchown_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_fchown(SB)
+TEXT ·libc_flock_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_flock(SB)
+TEXT ·libc_fpathconf_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_fpathconf(SB)
+TEXT ·libc_fstat64_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_fstat64(SB)
+TEXT ·libc_fstatfs64_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_fstatfs64(SB)
+TEXT ·libc_fsync_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_fsync(SB)
+TEXT ·libc_ftruncate_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_ftruncate(SB)
+TEXT ·libc___getdirentries64_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc___getdirentries64(SB)
+TEXT ·libc_getdtablesize_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getdtablesize(SB)
+TEXT ·libc_getegid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getegid(SB)
+TEXT ·libc_geteuid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_geteuid(SB)
+TEXT ·libc_getgid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getgid(SB)
+TEXT ·libc_getpgid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getpgid(SB)
+TEXT ·libc_getpgrp_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getpgrp(SB)
+TEXT ·libc_getpid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getpid(SB)
+TEXT ·libc_getppid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getppid(SB)
+TEXT ·libc_getpriority_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getpriority(SB)
+TEXT ·libc_getrlimit_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getrlimit(SB)
+TEXT ·libc_getrusage_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getrusage(SB)
+TEXT ·libc_getsid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getsid(SB)
+TEXT ·libc_getuid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_getuid(SB)
+TEXT ·libc_issetugid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_issetugid(SB)
+TEXT ·libc_kqueue_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_kqueue(SB)
+TEXT ·libc_lchown_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_lchown(SB)
+TEXT ·libc_link_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_link(SB)
+TEXT ·libc_listen_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_listen(SB)
+TEXT ·libc_lstat64_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_lstat64(SB)
+TEXT ·libc_mkdir_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_mkdir(SB)
+TEXT ·libc_mkfifo_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_mkfifo(SB)
+TEXT ·libc_mknod_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_mknod(SB)
+TEXT ·libc_mlock_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_mlock(SB)
+TEXT ·libc_mlockall_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_mlockall(SB)
+TEXT ·libc_mprotect_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_mprotect(SB)
+TEXT ·libc_munlock_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_munlock(SB)
+TEXT ·libc_munlockall_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_munlockall(SB)
+TEXT ·libc_open_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_open(SB)
+TEXT ·libc_pathconf_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_pathconf(SB)
+TEXT ·libc_pread_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_pread(SB)
+TEXT ·libc_pwrite_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_pwrite(SB)
+TEXT ·libc_read_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_read(SB)
+TEXT ·libc_readlink_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_readlink(SB)
+TEXT ·libc_rename_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_rename(SB)
+TEXT ·libc_revoke_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_revoke(SB)
+TEXT ·libc_rmdir_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_rmdir(SB)
+TEXT ·libc_lseek_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_lseek(SB)
+TEXT ·libc_select_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_select(SB)
+TEXT ·libc_setegid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_setegid(SB)
+TEXT ·libc_seteuid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_seteuid(SB)
+TEXT ·libc_setgid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_setgid(SB)
+TEXT ·libc_setlogin_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_setlogin(SB)
+TEXT ·libc_setpgid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_setpgid(SB)
+TEXT ·libc_setpriority_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_setpriority(SB)
+TEXT ·libc_setprivexec_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_setprivexec(SB)
+TEXT ·libc_setregid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_setregid(SB)
+TEXT ·libc_setreuid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_setreuid(SB)
+TEXT ·libc_setrlimit_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_setrlimit(SB)
+TEXT ·libc_setsid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_setsid(SB)
+TEXT ·libc_settimeofday_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_settimeofday(SB)
+TEXT ·libc_setuid_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_setuid(SB)
+TEXT ·libc_stat64_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_stat64(SB)
+TEXT ·libc_statfs64_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_statfs64(SB)
+TEXT ·libc_symlink_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_symlink(SB)
+TEXT ·libc_sync_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_sync(SB)
+TEXT ·libc_truncate_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_truncate(SB)
+TEXT ·libc_umask_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_umask(SB)
+TEXT ·libc_undelete_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_undelete(SB)
+TEXT ·libc_unlink_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_unlink(SB)
+TEXT ·libc_unmount_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_unmount(SB)
+TEXT ·libc_write_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_write(SB)
+TEXT ·libc_mmap_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_mmap(SB)
+TEXT ·libc_munmap_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_munmap(SB)
+TEXT ·libc_fork_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_fork(SB)
+TEXT ·libc_ioctl_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_ioctl(SB)
+TEXT ·libc_execve_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_execve(SB)
+TEXT ·libc_exit_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_exit(SB)
+TEXT ·libc_sysctl_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_sysctl(SB)
+TEXT ·libc_writev_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_writev(SB)
+TEXT ·libc_gettimeofday_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_gettimeofday(SB)