runtime: darwin/arm support

Change-Id: I63110daad2d62ae72ab1f33a40464d76e6205627
Reviewed-on: https://go-review.googlesource.com/2121Reviewed-by: David Crawshaw <crawshaw@golang.org>

src/runtime/defs_darwin_arm.go

+// Note: cgo can't handle some Darwin/ARM structures, so this file can't
+// be auto generated by cgo yet.
+// Created based on output of `cgo -cdefs defs_darwin.go` and Darwin/ARM
+// specific header (mainly mcontext and ucontext related stuff)
+
+package runtime
+
+import "unsafe"
+
+const (
+	_EINTR  = 0x4
+	_EFAULT = 0xe
+
+	_PROT_NONE  = 0x0
+	_PROT_READ  = 0x1
+	_PROT_WRITE = 0x2
+	_PROT_EXEC  = 0x4
+
+	_MAP_ANON    = 0x1000
+	_MAP_PRIVATE = 0x2
+	_MAP_FIXED   = 0x10
+
+	_MADV_DONTNEED = 0x4
+	_MADV_FREE     = 0x5
+
+	_MACH_MSG_TYPE_MOVE_RECEIVE   = 0x10
+	_MACH_MSG_TYPE_MOVE_SEND      = 0x11
+	_MACH_MSG_TYPE_MOVE_SEND_ONCE = 0x12
+	_MACH_MSG_TYPE_COPY_SEND      = 0x13
+	_MACH_MSG_TYPE_MAKE_SEND      = 0x14
+	_MACH_MSG_TYPE_MAKE_SEND_ONCE = 0x15
+	_MACH_MSG_TYPE_COPY_RECEIVE   = 0x16
+
+	_MACH_MSG_PORT_DESCRIPTOR         = 0x0
+	_MACH_MSG_OOL_DESCRIPTOR          = 0x1
+	_MACH_MSG_OOL_PORTS_DESCRIPTOR    = 0x2
+	_MACH_MSG_OOL_VOLATILE_DESCRIPTOR = 0x3
+
+	_MACH_MSGH_BITS_COMPLEX = 0x80000000
+
+	_MACH_SEND_MSG  = 0x1
+	_MACH_RCV_MSG   = 0x2
+	_MACH_RCV_LARGE = 0x4
+
+	_MACH_SEND_TIMEOUT   = 0x10
+	_MACH_SEND_INTERRUPT = 0x40
+	_MACH_SEND_ALWAYS    = 0x10000
+	_MACH_SEND_TRAILER   = 0x20000
+	_MACH_RCV_TIMEOUT    = 0x100
+	_MACH_RCV_NOTIFY     = 0x200
+	_MACH_RCV_INTERRUPT  = 0x400
+	_MACH_RCV_OVERWRITE  = 0x1000
+
+	_NDR_PROTOCOL_2_0      = 0x0
+	_NDR_INT_BIG_ENDIAN    = 0x0
+	_NDR_INT_LITTLE_ENDIAN = 0x1
+	_NDR_FLOAT_IEEE        = 0x0
+	_NDR_CHAR_ASCII        = 0x0
+
+	_SA_SIGINFO   = 0x40
+	_SA_RESTART   = 0x2
+	_SA_ONSTACK   = 0x1
+	_SA_USERTRAMP = 0x100
+	_SA_64REGSET  = 0x200
+
+	_SIGHUP    = 0x1
+	_SIGINT    = 0x2
+	_SIGQUIT   = 0x3
+	_SIGILL    = 0x4
+	_SIGTRAP   = 0x5
+	_SIGABRT   = 0x6
+	_SIGEMT    = 0x7
+	_SIGFPE    = 0x8
+	_SIGKILL   = 0x9
+	_SIGBUS    = 0xa
+	_SIGSEGV   = 0xb
+	_SIGSYS    = 0xc
+	_SIGPIPE   = 0xd
+	_SIGALRM   = 0xe
+	_SIGTERM   = 0xf
+	_SIGURG    = 0x10
+	_SIGSTOP   = 0x11
+	_SIGTSTP   = 0x12
+	_SIGCONT   = 0x13
+	_SIGCHLD   = 0x14
+	_SIGTTIN   = 0x15
+	_SIGTTOU   = 0x16
+	_SIGIO     = 0x17
+	_SIGXCPU   = 0x18
+	_SIGXFSZ   = 0x19
+	_SIGVTALRM = 0x1a
+	_SIGPROF   = 0x1b
+	_SIGWINCH  = 0x1c
+	_SIGINFO   = 0x1d
+	_SIGUSR1   = 0x1e
+	_SIGUSR2   = 0x1f
+
+	_FPE_INTDIV = 0x7
+	_FPE_INTOVF = 0x8
+	_FPE_FLTDIV = 0x1
+	_FPE_FLTOVF = 0x2
+	_FPE_FLTUND = 0x3
+	_FPE_FLTRES = 0x4
+	_FPE_FLTINV = 0x5
+	_FPE_FLTSUB = 0x6
+
+	_BUS_ADRALN = 0x1
+	_BUS_ADRERR = 0x2
+	_BUS_OBJERR = 0x3
+
+	_SEGV_MAPERR = 0x1
+	_SEGV_ACCERR = 0x2
+
+	_ITIMER_REAL    = 0x0
+	_ITIMER_VIRTUAL = 0x1
+	_ITIMER_PROF    = 0x2
+
+	_EV_ADD       = 0x1
+	_EV_DELETE    = 0x2
+	_EV_CLEAR     = 0x20
+	_EV_RECEIPT   = 0x40
+	_EV_ERROR     = 0x4000
+	_EVFILT_READ  = -0x1
+	_EVFILT_WRITE = -0x2
+)
+
+type machbody struct {
+	msgh_descriptor_count uint32
+}
+
+type machheader struct {
+	msgh_bits        uint32
+	msgh_size        uint32
+	msgh_remote_port uint32
+	msgh_local_port  uint32
+	msgh_reserved    uint32
+	msgh_id          int32
+}
+
+type machndr struct {
+	mig_vers     uint8
+	if_vers      uint8
+	reserved1    uint8
+	mig_encoding uint8
+	int_rep      uint8
+	char_rep     uint8
+	float_rep    uint8
+	reserved2    uint8
+}
+
+type machport struct {
+	name        uint32
+	pad1        uint32
+	pad2        uint16
+	disposition uint8
+	_type       uint8
+}
+
+type stackt struct {
+	ss_sp    *byte
+	ss_size  uintptr
+	ss_flags int32
+}
+
+type sigactiont struct {
+	__sigaction_u [4]byte
+	sa_tramp      unsafe.Pointer
+	sa_mask       uint32
+	sa_flags      int32
+}
+
+type siginfo struct {
+	si_signo  int32
+	si_errno  int32
+	si_code   int32
+	si_pid    int32
+	si_uid    uint32
+	si_status int32
+	si_addr   *byte
+	si_value  [4]byte
+	si_band   int32
+	__pad     [7]uint32
+}
+
+type timeval struct {
+	tv_sec  int32
+	tv_usec int32
+}
+
+func (tv *timeval) set_usec(x int32) {
+	tv.tv_usec = x
+}
+
+type itimerval struct {
+	it_interval timeval
+	it_value    timeval
+}
+
+type timespec struct {
+	tv_sec  int32
+	tv_nsec int32
+}
+
+type floatstate32 struct {
+	r     [32]uint32
+	fpscr uint32
+}
+
+type regs32 struct {
+	r    [13]uint32 // r0 to r12
+	sp   uint32     // r13
+	lr   uint32     // r14
+	pc   uint32     // r15
+	cpsr uint32
+}
+
+type exceptionstate32 struct {
+	trapno     uint32 // NOTE: on 386, the trapno field is split into trapno and cpu
+	err        uint32
+	faultvaddr uint32
+}
+
+type mcontext32 struct {
+	es exceptionstate32
+	ss regs32
+	fs floatstate32
+}
+
+type ucontext struct {
+	uc_onstack  int32
+	uc_sigmask  uint32
+	uc_stack    stackt
+	uc_link     *ucontext
+	uc_mcsize   uint32
+	uc_mcontext *mcontext32
+}
+
+type keventt struct {
+	ident  uint32
+	filter int16
+	flags  uint16
+	fflags uint32
+	data   int32
+	udata  *byte
+}

src/runtime/os_darwin_arm.go

+// Copyright 2014 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 runtime
+
+func checkgoarm() {
+	return // TODO(minux)
+}
+
+//go:nosplit
+func cputicks() int64 {
+	// Currently cputicks() is used in blocking profiler and to seed runtime·fastrand1().
+	// runtime·nanotime() is a poor approximation of CPU ticks that is enough for the profiler.
+	// TODO: need more entropy to better seed fastrand1.
+	return nanotime()
+}

src/runtime/rt0_darwin_arm.s

+// Copyright 2014 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.
+
+#include "textflag.h"
+
+TEXT _rt0_arm_darwin(SB),7,$-4
+	// prepare arguments for main (_rt0_go)
+	MOVW	(R13), R0	// argc
+	MOVW	$4(R13), R1		// argv
+	MOVW	$main(SB), R4
+	B		(R4)
+
+TEXT main(SB),NOSPLIT,$-8
+	// save argc and argv onto stack
+	MOVM.DB.W [R0-R1], (R13)
+	MOVW	$runtime·rt0_go(SB), R4
+	B		(R4)

src/runtime/signal_darwin_arm.go

+// Copyright 2014 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 runtime
+
+import "unsafe"
+
+type sigctxt struct {
+	info *siginfo
+	ctxt unsafe.Pointer
+}
+
+func (c *sigctxt) regs() *regs32   { return &(*ucontext)(c.ctxt).uc_mcontext.ss }
+func (c *sigctxt) r0() uint32      { return c.regs().r[0] }
+func (c *sigctxt) r1() uint32      { return c.regs().r[1] }
+func (c *sigctxt) r2() uint32      { return c.regs().r[2] }
+func (c *sigctxt) r3() uint32      { return c.regs().r[3] }
+func (c *sigctxt) r4() uint32      { return c.regs().r[4] }
+func (c *sigctxt) r5() uint32      { return c.regs().r[5] }
+func (c *sigctxt) r6() uint32      { return c.regs().r[6] }
+func (c *sigctxt) r7() uint32      { return c.regs().r[7] }
+func (c *sigctxt) r8() uint32      { return c.regs().r[8] }
+func (c *sigctxt) r9() uint32      { return c.regs().r[9] }
+func (c *sigctxt) r10() uint32     { return c.regs().r[10] }
+func (c *sigctxt) fp() uint32      { return c.regs().r[11] }
+func (c *sigctxt) ip() uint32      { return c.regs().r[12] }
+func (c *sigctxt) sp() uint32      { return c.regs().sp }
+func (c *sigctxt) lr() uint32      { return c.regs().lr }
+func (c *sigctxt) pc() uint32      { return c.regs().pc }
+func (c *sigctxt) cpsr() uint32    { return c.regs().cpsr }
+func (c *sigctxt) fault() uint32   { return uint32(uintptr(unsafe.Pointer(c.info.si_addr))) }
+func (c *sigctxt) sigcode() uint32 { return uint32(c.info.si_code) }
+func (c *sigctxt) trap() uint32    { return 0 }
+func (c *sigctxt) error() uint32   { return 0 }
+func (c *sigctxt) oldmask() uint32 { return 0 }
+
+func (c *sigctxt) set_pc(x uint32)  { c.regs().pc = x }
+func (c *sigctxt) set_sp(x uint32)  { c.regs().sp = x }
+func (c *sigctxt) set_lr(x uint32)  { c.regs().lr = x }
+func (c *sigctxt) set_r10(x uint32) { c.regs().r[10] = x }
+
+func (c *sigctxt) set_sigcode(x uint32) { c.info.si_code = int32(x) }
+func (c *sigctxt) set_sigaddr(x uint32) { c.info.si_addr = (*byte)(unsafe.Pointer(uintptr(x))) }

src/runtime/stack.h

@@ -7,14 +7,22 @@
 
 enum {
 #ifdef GOOS_windows
-#define StackSystem (512*sizeof(uintptr))
-#else
+#define STACKSYSTEM (512 * sizeof(uintptr))
+#endif // GOOS_windows
 #ifdef GOOS_plan9
-#define StackSystem (512)
-#else
-	StackSystem = 0,
-#endif	// Plan 9
-#endif	// Windows
+#define STACKSYSTEM	512
+#endif // GOOS_plan9
+#ifdef GOOS_darwin
+#ifdef GOARCH_arm
+#define STACKSYSTEM 1024
+#endif // GOARCH_arm
+#endif // GOOS_darwin
+
+#ifndef STACKSYSTEM
+#define STACKSYSTEM 0
+#endif
+
+	StackSystem = STACKSYSTEM,
 
 	StackBig = 4096,
 	StackGuard = 640 + StackSystem,

src/runtime/stack2.go

@@ -57,9 +57,9 @@ functions to make sure that this limit cannot be violated.
 const (
 	// StackSystem is a number of additional bytes to add
 	// to each stack below the usual guard area for OS-specific
-	// purposes like signal handling. Used on Windows and on
-	// Plan 9 because they do not use a separate stack.
-	_StackSystem = goos_windows*512*ptrSize + goos_plan9*512
+	// purposes like signal handling. Used on Windows, Plan 9,
+	// and Darwin/ARM because they do not use a separate stack.
+	_StackSystem = goos_windows*512*ptrSize + goos_plan9*512 + goos_darwin*goarch_arm*1024
 
 	// The minimum size of stack used by Go code
 	_StackMin = 2048

src/runtime/tls_arm.s

@@ -15,11 +15,14 @@
 // Note: both functions will clobber R0 and R11 and
 // can be called from 5c ABI code.
 
-// On android, runtime.tlsg is a normal variable.
+// On android and darwin, runtime.tlsg is a normal variable.
 // TLS offset is computed in x_cgo_inittls.
 #ifdef GOOS_android
 #define TLSG_IS_VARIABLE
 #endif
+#ifdef GOOS_darwin
+#define TLSG_IS_VARIABLE
+#endif
 
 // save_g saves the g register into pthread-provided
 // thread-local memory, so that we can call externally compiled
@@ -37,6 +40,7 @@ TEXT runtime·save_g(SB),NOSPLIT,$-4
 	// a call to runtime.read_tls_fallback which jumps to __kuser_get_tls.
 	// The replacement function saves LR in R11 over the call to read_tls_fallback.
 	MRC	15, 0, R0, C13, C0, 3 // fetch TLS base pointer
+	BIC $3, R0 // Darwin/ARM might return unaligned pointer
 	// $runtime.tlsg(SB) is a special linker symbol.
 	// It is the offset from the TLS base pointer to our
 	// thread-local storage for g.
@@ -60,6 +64,7 @@ TEXT runtime·load_g(SB),NOSPLIT,$0
 #endif
 	// See save_g
 	MRC	15, 0, R0, C13, C0, 3 // fetch TLS base pointer
+	BIC $3, R0 // Darwin/ARM might return unaligned pointer
 	// $runtime.tlsg(SB) is a special linker symbol.
 	// It is the offset from the TLS base pointer to our
 	// thread-local storage for g.