all: nacl import round 2

These previously reviewed CLs are present in this CL.

---
changeset:   18445:436bb084caed
user:        Russ Cox <rsc@golang.org>
date:        Mon Nov 11 09:50:34 2013 -0500
description:
runtime: assembly and system calls for Native Client x86-64

See golang.org/s/go13nacl for design overview.

This CL is publicly visible but not CC'ed to golang-dev,
to avoid distracting from the preparation of the Go 1.2
release.

This CL and the others will be checked into my rsc-go13nacl
clone repo for now, and I will send CLs against the main
repo early in the Go 1.3 development.

R≡adg
https://golang.org/cl/15760044

---
changeset:   18448:90bd871b5994
user:        Russ Cox <rsc@golang.org>
date:        Mon Nov 11 09:51:36 2013 -0500
description:
runtime: amd64p32 and Native Client assembly bootstrap

See golang.org/s/go13nacl for design overview.

This CL is publicly visible but not CC'ed to golang-dev,
to avoid distracting from the preparation of the Go 1.2
release.

This CL and the others will be checked into my rsc-go13nacl
clone repo for now, and I will send CLs against the main
repo early in the Go 1.3 development.

R≡khr
https://golang.org/cl/15820043

---
changeset:   18449:b011c3dc687e
user:        Russ Cox <rsc@golang.org>
date:        Mon Nov 11 09:51:58 2013 -0500
description:
math: amd64p32 assembly routines

These routines only manipulate float64 values,
so the amd64 and amd64p32 can share assembly.

The large number of files is symptomatic of a problem
with package path: it is a Go package structured like a C library.
But that will need to wait for another day.

See golang.org/s/go13nacl for design overview.

This CL is publicly visible but not CC'ed to golang-dev,
to avoid distracting from the preparation of the Go 1.2
release.

This CL and the others will be checked into my rsc-go13nacl
clone repo for now, and I will send CLs against the main
repo early in the Go 1.3 development.

R≡bradfitz
https://golang.org/cl/15870043

---
changeset:   18450:43234f082eec
user:        Russ Cox <rsc@golang.org>
date:        Mon Nov 11 10:03:19 2013 -0500
description:
syscall: networking for Native Client

See golang.org/s/go13nacl for design overview.

This CL is publicly visible but not CC'ed to golang-dev,
to avoid distracting from the preparation of the Go 1.2
release.

This CL and the others will be checked into my rsc-go13nacl
clone repo for now, and I will send CLs against the main
repo early in the Go 1.3 development.

R≡rsc
https://golang.org/cl/15780043

---
changeset:   18451:9c8d1d890aaa
user:        Russ Cox <rsc@golang.org>
date:        Mon Nov 11 10:03:34 2013 -0500
description:
runtime: assembly and system calls for Native Client x86-32

See golang.org/s/go13nacl for design overview.

This CL is publicly visible but not CC'ed to golang-dev,
to avoid distracting from the preparation of the Go 1.2
release.

This CL and the others will be checked into my rsc-go13nacl
clone repo for now, and I will send CLs against the main
repo early in the Go 1.3 development.

R≡rsc
https://golang.org/cl/15800043

---
changeset:   18452:f90b1dd9228f
user:        Russ Cox <rsc@golang.org>
date:        Mon Nov 11 11:04:09 2013 -0500
description:
runtime: fix frame size for linux/amd64 runtime.raise

R≡rsc
https://golang.org/cl/24480043

---
changeset:   18445:436bb084caed
user:        Russ Cox <rsc@golang.org>
date:        Mon Nov 11 09:50:34 2013 -0500
description:
runtime: assembly and system calls for Native Client x86-64

See golang.org/s/go13nacl for design overview.

This CL is publicly visible but not CC'ed to golang-dev,
to avoid distracting from the preparation of the Go 1.2
release.

This CL and the others will be checked into my rsc-go13nacl
clone repo for now, and I will send CLs against the main
repo early in the Go 1.3 development.

R≡adg
https://golang.org/cl/15760044

---
changeset:   18455:53b06799a938
user:        Russ Cox <rsc@golang.org>
date:        Mon Nov 11 23:29:52 2013 -0500
description:
cmd/gc: add -nolocalimports flag

R≡dsymonds
https://golang.org/cl/24990043

---
changeset:   18456:24f64e1eaa8a
user:        Russ Cox <rsc@golang.org>
date:        Tue Nov 12 22:06:29 2013 -0500
description:
runtime: add comments for playback write

R≡adg
https://golang.org/cl/25190043

---
changeset:   18457:d1f615bbb6e4
user:        Russ Cox <rsc@golang.org>
date:        Wed Nov 13 17:03:52 2013 -0500
description:
runtime: write only to NaCl stdout, never to NaCl stderr

NaCl writes some other messages on standard error
that we would like to be able to squelch.

R≡adg
https://golang.org/cl/26240044

---
changeset:   18458:1f01be1a1dc2
tag:         tip
user:        Russ Cox <rsc@golang.org>
date:        Wed Nov 13 19:45:16 2013 -0500
description:
runtime: remove apparent debugging dreg

Setting timens to 0 turns off fake time.

TBR≡adg
https://golang.org/cl/26400043

LGTM=bradfitz
R=dave, bradfitz
CC=golang-codereviews
https://golang.org/cl/68730043

src/cmd/gc/go.h

@@ -861,6 +861,7 @@ EXTERN	int	nerrors;
 EXTERN	int	nsavederrors;
 EXTERN	int	nsyntaxerrors;
 EXTERN	int	safemode;
+EXTERN	int	nolocalimports;
 EXTERN	char	namebuf[NSYMB];
 EXTERN	char	lexbuf[NSYMB];
 EXTERN	char	litbuf[NSYMB];

src/cmd/gc/lex.c

@@ -301,6 +301,7 @@ main(int argc, char *argv[])
 	flagcount("l", "disable inlining", &debug['l']);
 	flagcount("live", "debug liveness analysis", &debuglive);
 	flagcount("m", "print optimization decisions", &debug['m']);
+	flagcount("nolocalimports", "reject local (relative) imports", &nolocalimports);
 	flagstr("o", "obj: set output file", &outfile);
 	flagstr("p", "path: set expected package import path", &myimportpath);
 	flagcount("pack", "write package file instead of object file", &writearchive);
@@ -610,7 +611,7 @@ findpkg(Strlit *name)
 	char *q, *suffix, *suffixsep;
 
 	if(islocalname(name)) {
-		if(safemode)
+		if(safemode || nolocalimports)
 			return 0;
 		// try .a before .6.  important for building libraries:
 		// if there is an array.6 in the array.a library,

src/pkg/math/abs_amd64p32.s

+// Copyright 2013 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 "abs_amd64.s"

src/pkg/math/asin_amd64p32.s

+// Copyright 2013 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 "asin_amd64.s"

src/pkg/math/atan2_amd64p32.s

+// Copyright 2013 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 "atan2_amd64.s"

src/pkg/math/atan_amd64p32.s

+// Copyright 2013 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 "atan_amd64.s"

src/pkg/math/big/arith_amd64p32.s

+// Copyright 2013 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 "../../../cmd/ld/textflag.h"
+
+TEXT ·mulWW(SB),NOSPLIT,$0
+	JMP ·mulWW_g(SB)
+
+TEXT ·divWW(SB),NOSPLIT,$0
+	JMP ·divWW_g(SB)
+
+TEXT ·addVV(SB),NOSPLIT,$0
+	JMP ·addVV_g(SB)
+
+TEXT ·subVV(SB),NOSPLIT,$0
+	JMP ·subVV_g(SB)
+
+TEXT ·addVW(SB),NOSPLIT,$0
+	JMP ·addVW_g(SB)
+
+TEXT ·subVW(SB),NOSPLIT,$0
+	JMP ·subVW_g(SB)
+
+TEXT ·shlVU(SB),NOSPLIT,$0
+	JMP ·shlVU_g(SB)
+
+TEXT ·shrVU(SB),NOSPLIT,$0
+	JMP ·shrVU_g(SB)
+
+TEXT ·mulAddVWW(SB),NOSPLIT,$0
+	JMP ·mulAddVWW_g(SB)
+
+TEXT ·addMulVVW(SB),NOSPLIT,$0
+	JMP ·addMulVVW_g(SB)
+
+TEXT ·divWVW(SB),NOSPLIT,$0
+	JMP ·divWVW_g(SB)
+
+TEXT ·bitLen(SB),NOSPLIT,$0
+	JMP ·bitLen_g(SB)

src/pkg/math/dim_amd64p32.s

+// Copyright 2013 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 "dim_amd64.s"

src/pkg/math/exp2_amd64p32.s

+// Copyright 2013 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 "exp2_amd64.s"

src/pkg/math/exp_amd64p32.s

+// Copyright 2013 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 "exp_amd64.s"

src/pkg/math/expm1_amd64p32.s

+// Copyright 2013 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 "expm1_amd64.s"

src/pkg/math/floor_amd64p32.s

+// Copyright 2013 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 "floor_amd64.s"

src/pkg/math/frexp_amd64p32.s

+// Copyright 2013 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 "frexp_amd64.s"

src/pkg/math/hypot_amd64p32.s

+// Copyright 2013 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 "hypot_amd64.s"

src/pkg/math/ldexp_amd64p32.s

+// Copyright 2013 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 "ldexp_amd64.s"

src/pkg/math/log10_amd64p32.s

+// Copyright 2013 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 "log10_amd64.s"

src/pkg/math/log1p_amd64p32.s

+// Copyright 2013 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 "log1p_amd64.s"

src/pkg/math/log_amd64p32.s

+// Copyright 2013 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 "log_amd64.s"

src/pkg/math/mod_amd64p32.s

+// Copyright 2013 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 "mod_amd64.s"

src/pkg/math/modf_amd64p32.s

+// Copyright 2013 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 "modf_amd64.s"

src/pkg/math/remainder_amd64p32.s

+// Copyright 2013 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 "remainder_amd64.s"

src/pkg/math/sin_amd64p32.s

+// Copyright 2013 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 "sin_amd64.s"

src/pkg/math/sincos_amd64p32.s

+// Copyright 2013 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 "sincos_amd64.s"

src/pkg/math/sqrt_amd64p32.s

+// Copyright 2013 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 "sqrt_amd64.s"

src/pkg/math/tan_amd64p32.s

+// Copyright 2013 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 "tan_amd64.s"

src/pkg/runtime/asm_386.s

@@ -340,7 +340,7 @@ TEXT reflect·call(SB), NOSPLIT, $0-12
 	JMP	AX
 
 #define CALLFN(NAME,MAXSIZE)			\
-TEXT runtime·NAME(SB), WRAPPER, $MAXSIZE-12;		\
+TEXT runtime·NAME(SB), WRAPPER, $MAXSIZE-12;	\
 	/* copy arguments to stack */		\
 	MOVL	argptr+4(FP), SI;		\
 	MOVL	argsize+8(FP), CX;		\
@@ -348,7 +348,8 @@ TEXT runtime·NAME(SB), WRAPPER, $MAXSIZE-12;		\
 	REP;MOVSB;				\
 	/* call function */			\
 	MOVL	f+0(FP), DX;			\
-	CALL	(DX);				\
+	MOVL	(DX), AX; 			\
+	CALL	AX;				\
 	/* copy return values back */		\
 	MOVL	argptr+4(FP), DI;		\
 	MOVL	argsize+8(FP), CX;		\

src/pkg/runtime/atomic_amd64.c → src/pkg/runtime/atomic_amd64x.c

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build amd64 amd64p32
+
 #include "runtime.h"
 #include "../../cmd/ld/textflag.h"
 

src/pkg/runtime/cgo/asm_nacl_amd64p32.s

+// Copyright 2013 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 "../../../cmd/ld/textflag.h"
+
+/*
+ * void crosscall2(void (*fn)(void*, int32), void*, int32)
+ * Save registers and call fn with two arguments.
+ */
+TEXT crosscall2(SB),NOSPLIT,$0
+	INT $3
+	RET

src/pkg/runtime/defs_nacl_386.h

+// Copyright 2013 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.
+
+// Created by hand, not machine generated.
+
+enum
+{
+	// These values are referred to in the source code
+	// but really don't matter. Even so, use the standard numbers.
+	SIGSEGV = 11,
+	SIGPROF = 27,
+};
+
+typedef struct Siginfo Siginfo;
+
+// native_client/src/trusted/service_runtime/include/machine/_types.h
+typedef struct Timespec Timespec;
+
+struct Timespec
+{
+	int64 tv_sec;
+	int32 tv_nsec;
+};
+
+// native_client/src/trusted/service_runtime/nacl_exception.h
+// native_client/src/include/nacl/nacl_exception.h
+
+typedef struct ExcContext ExcContext;
+typedef struct ExcPortable ExcPortable;
+typedef struct ExcRegs386 ExcRegs386;
+
+struct ExcRegs386
+{
+	uint32	eax;
+	uint32	ecx;
+	uint32	edx;
+	uint32	ebx;
+	uint32	esp;
+	uint32	ebp;
+	uint32	esi;
+	uint32	edi;
+	uint32	eip;
+	uint32	eflags;
+};
+
+struct ExcContext
+{
+	uint32	size;
+	uint32	portable_context_offset;
+	uint32	portable_context_size;
+	uint32	arch;
+	uint32	regs_size;
+	uint32	reserved[11];
+	ExcRegs386	regs;
+};
+
+struct ExcPortableContext
+{
+	uint32	pc;
+	uint32	sp;
+	uint32	fp;
+};

src/pkg/runtime/defs_nacl_amd64p32.h

+// Copyright 2013 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.
+
+// Created by hand, not machine generated.
+
+enum
+{
+	// These values are referred to in the source code
+	// but really don't matter. Even so, use the standard numbers.
+	SIGSEGV = 11,
+	SIGPROF = 27,
+};
+
+typedef struct Siginfo Siginfo;
+
+
+// native_client/src/trusted/service_runtime/include/machine/_types.h
+typedef struct Timespec Timespec;
+
+struct Timespec
+{
+	int64 tv_sec;
+	int32 tv_nsec;
+};
+
+// native_client/src/trusted/service_runtime/nacl_exception.h
+// native_client/src/include/nacl/nacl_exception.h
+
+typedef struct ExcContext ExcContext;
+typedef struct ExcPortable ExcPortable;
+typedef struct ExcRegs386 ExcRegs386;
+typedef struct ExcRegsAmd64 ExcRegsAmd64;
+
+struct ExcRegs386
+{
+	uint32	eax;
+	uint32	ecx;
+	uint32	edx;
+	uint32	ebx;
+	uint32	esp;
+	uint32	ebp;
+	uint32	esi;
+	uint32	edi;
+	uint32	eip;
+	uint32	eflags;
+};
+
+struct ExcRegsAmd64
+{
+	uint64	rax;
+	uint64	rcx;
+	uint64	rdx;
+	uint64	rbx;
+	uint64	rsp;
+	uint64	rbp;
+	uint64	rsi;
+	uint64	rdi;
+	uint64	r8;
+	uint64	r9;
+	uint64	r10;
+	uint64	r11;
+	uint64	r12;
+	uint64	r13;
+	uint64	r14;
+	uint64	r15;
+	uint64	rip;
+	uint32	rflags;
+};
+
+struct ExcContext
+{
+	uint32	size;
+	uint32	portable_context_offset;
+	uint32	portable_context_size;
+	uint32	arch;
+	uint32	regs_size;
+	uint32	reserved[11];
+	union {
+		ExcRegs386	regs;
+		ExcRegsAmd64	regs64;
+	};
+};
+
+struct ExcPortableContext
+{
+	uint32	pc;
+	uint32	sp;
+	uint32	fp;
+};

src/pkg/runtime/memmove_nacl_amd64p32.s

+// Copyright 2013 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 "../../cmd/ld/textflag.h"
+
+TEXT runtime·memmove(SB), NOSPLIT, $0-12
+	MOVL	to+0(FP), DI
+	MOVL	fr+4(FP), SI
+	MOVL	n+8(FP), BX
+
+	CMPL	SI, DI
+	JLS back
+
+forward:
+	MOVL	BX, CX
+	SHRL	$3, CX
+	ANDL	$7, BX
+	REP; MOVSQ
+	MOVL	BX, CX
+	REP; MOVSB
+	RET
+
+back:
+	MOVL	SI, CX
+	ADDL	BX, CX
+	CMPL	CX, DI
+	JLS forward
+
+	ADDL	BX, DI
+	ADDL	BX, SI
+	STD
+	
+	MOVL	BX, CX
+	SHRL	$3, CX
+	ANDL	$7, BX
+	SUBL	$8, DI
+	SUBL	$8, SI
+	REP; MOVSQ
+	ADDL	$7, DI
+	ADDL	$7, SI
+	MOVL	BX, CX
+	REP; MOVSB
+	CLD
+
+	RET

src/pkg/runtime/rt0_nacl_386.s

+// Copyright 2013 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 "../../cmd/ld/textflag.h"
+
+// NaCl entry has:
+//	0(FP) - arg block == SP+8
+//	4(FP) - cleanup function pointer, always 0
+//	8(FP) - envc
+//	12(FP) - argc
+//	16(FP) - argv, then 0, then envv, then 0, then auxv
+TEXT _rt0_386_nacl(SB),NOSPLIT,$8
+	MOVL	argc+12(FP), AX
+	LEAL	argv+16(FP), BX
+	MOVL	AX, 0(SP)
+	MOVL	BX, 4(SP)
+	CALL	main(SB)
+	INT	$3
+
+TEXT main(SB),NOSPLIT,$0
+	JMP	_rt0_go(SB)

src/pkg/runtime/rt0_nacl_amd64p32.s

+// Copyright 2013 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 "../../cmd/ld/textflag.h"
+
+// NaCl entry on 32-bit x86 has DI pointing at the arg block, which contains:
+//
+//	0(DI) - cleanup function pointer, always 0
+//	4(DI) - envc
+//	8(DI) - argc
+//	12(DI) - argv, then 0, then envv, then 0, then auxv
+// NaCl entry here is almost the same, except that there
+// is no saved caller PC, so 0(FP) is -8(FP) and so on. 
+TEXT _rt0_amd64p32_nacl(SB),NOSPLIT,$16
+	MOVL	DI, 0(SP)
+	CALL	runtime·nacl_sysinfo(SB)
+	MOVL	0(SP), DI
+	MOVL	8(DI), AX
+	LEAL	12(DI), BX
+	MOVL	AX, 0(SP)
+	MOVL	BX, 4(SP)
+	CALL	main(SB)
+	INT	$3
+
+TEXT main(SB),NOSPLIT,$0
+	// Uncomment for fake time like on Go Playground.
+	//MOVQ	$1257894000000000000, AX
+	//MOVQ	AX, runtime·timens(SB)
+	JMP	_rt0_go(SB)

src/pkg/runtime/sys_linux_amd64.s

@@ -76,7 +76,7 @@ TEXT runtime·usleep(SB),NOSPLIT,$16
 	SYSCALL
 	RET
 
-TEXT runtime·raise(SB),NOSPLIT,$12
+TEXT runtime·raise(SB),NOSPLIT,$0
 	MOVL	$186, AX	// syscall - gettid
 	SYSCALL
 	MOVL	AX, DI	// arg 1 tid

src/pkg/runtime/sys_nacl_386.s

+// Copyright 2013 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 "zasm_GOOS_GOARCH.h"
+#include "../../cmd/ld/textflag.h"
+#include "syscall_nacl.h"
+
+#define NACL_SYSCALL(code) \
+	MOVL $(0x10000 + ((code)<<5)), AX; CALL AX
+
+#define NACL_SYSJMP(code) \
+	MOVL $(0x10000 + ((code)<<5)), AX; JMP AX
+
+TEXT runtime·exit(SB),NOSPLIT,$0
+	NACL_SYSJMP(SYS_exit)
+
+TEXT runtime·exit1(SB),NOSPLIT,$0
+	NACL_SYSJMP(SYS_thread_exit)
+
+TEXT runtime·open(SB),NOSPLIT,$0
+	NACL_SYSJMP(SYS_open)
+
+TEXT runtime·close(SB),NOSPLIT,$0
+	NACL_SYSJMP(SYS_close)
+
+TEXT runtime·read(SB),NOSPLIT,$0
+	NACL_SYSJMP(SYS_read)
+
+TEXT runtime·write(SB),NOSPLIT,$0
+	NACL_SYSJMP(SYS_write)
+
+TEXT runtime·nacl_exception_stack(SB),NOSPLIT,$0
+	NACL_SYSJMP(SYS_exception_stack)
+
+TEXT runtime·nacl_exception_handler(SB),NOSPLIT,$0
+	NACL_SYSJMP(SYS_exception_handler)
+
+TEXT runtime·nacl_sem_create(SB),NOSPLIT,$0
+	NACL_SYSJMP(SYS_sem_create)
+
+TEXT runtime·nacl_sem_wait(SB),NOSPLIT,$0
+	NACL_SYSJMP(SYS_sem_wait)
+
+TEXT runtime·nacl_sem_post(SB),NOSPLIT,$0
+	NACL_SYSJMP(SYS_sem_post)
+
+TEXT runtime·nacl_mutex_create(SB),NOSPLIT,$0
+	NACL_SYSJMP(SYS_mutex_create)
+
+TEXT runtime·nacl_mutex_lock(SB),NOSPLIT,$0
+	NACL_SYSJMP(SYS_mutex_lock)
+
+TEXT runtime·nacl_mutex_trylock(SB),NOSPLIT,$0
+	NACL_SYSJMP(SYS_mutex_trylock)
+
+TEXT runtime·nacl_mutex_unlock(SB),NOSPLIT,$0
+	NACL_SYSJMP(SYS_mutex_unlock)
+
+TEXT runtime·nacl_cond_create(SB),NOSPLIT,$0
+	NACL_SYSJMP(SYS_cond_create)
+
+TEXT runtime·nacl_cond_wait(SB),NOSPLIT,$0
+	NACL_SYSJMP(SYS_cond_wait)
+
+TEXT runtime·nacl_cond_signal(SB),NOSPLIT,$0
+	NACL_SYSJMP(SYS_cond_signal)
+
+TEXT runtime·nacl_cond_broadcast(SB),NOSPLIT,$0
+	NACL_SYSJMP(SYS_cond_broadcast)
+
+TEXT runtime·nacl_cond_timed_wait_abs(SB),NOSPLIT,$0
+	NACL_SYSJMP(SYS_cond_timed_wait_abs)
+
+TEXT runtime·nacl_thread_create(SB),NOSPLIT,$0
+	NACL_SYSJMP(SYS_thread_create)
+
+TEXT runtime·mstart_nacl(SB),NOSPLIT,$0
+	JMP runtime·mstart(SB)
+
+TEXT runtime·nacl_nanosleep(SB),NOSPLIT,$0
+	NACL_SYSJMP(SYS_nanosleep)
+
+TEXT runtime·osyield(SB),NOSPLIT,$0
+	NACL_SYSJMP(SYS_sched_yield)
+
+TEXT runtime·mmap(SB),NOSPLIT,$32
+	MOVL	arg1+0(FP), AX
+	MOVL	AX, 0(SP)
+	MOVL	arg2+4(FP), AX
+	MOVL	AX, 4(SP)
+	MOVL	arg3+8(FP), AX
+	MOVL	AX, 8(SP)
+	MOVL	arg4+12(FP), AX
+	MOVL	AX, 12(SP)
+	MOVL	arg5+16(FP), AX
+	MOVL	AX, 16(SP)
+	MOVL	arg6+20(FP), AX
+	MOVL	AX, 24(SP)
+	MOVL	$0, 28(SP)
+	LEAL	24(SP), AX
+	MOVL	AX, 20(SP)
+	NACL_SYSCALL(SYS_mmap)
+	RET
+
+TEXT time·now(SB),NOSPLIT,$20
+	MOVL $0, 0(SP) // real time clock
+	LEAL 8(SP), AX
+	MOVL AX, 4(SP) // timespec
+	NACL_SYSCALL(SYS_clock_gettime)
+	MOVL 8(SP), AX // low 32 sec
+	MOVL 12(SP), CX // high 32 sec
+	MOVL 16(SP), BX // nsec
+
+	// sec is in AX, nsec in BX
+	MOVL	AX, sec+0(FP)
+	MOVL	CX, sec+4(FP)
+	MOVL	BX, nsec+8(FP)
+	RET
+
+TEXT syscall·now(SB),NOSPLIT,$0
+	JMP time·now(SB)
+
+TEXT runtime·nacl_clock_gettime(SB),NOSPLIT,$0
+	NACL_SYSJMP(SYS_clock_gettime)
+	
+TEXT runtime·nanotime(SB),NOSPLIT,$20
+	MOVL $0, 0(SP) // real time clock
+	LEAL 8(SP), AX
+	MOVL AX, 4(SP) // timespec
+	NACL_SYSCALL(SYS_clock_gettime)
+	MOVL 8(SP), AX // low 32 sec
+	MOVL 16(SP), BX // nsec
+
+	// sec is in AX, nsec in BX
+	// convert to DX:AX nsec
+	MOVL	$1000000000, CX
+	MULL	CX
+	ADDL	BX, AX
+	ADCL	$0, DX
+
+	MOVL	ret+0(FP), DI
+	MOVL	AX, 0(DI)
+	MOVL	DX, 4(DI)
+	RET
+
+TEXT runtime·setldt(SB),NOSPLIT,$8
+	MOVL	addr+4(FP), BX // aka base
+	ADDL	$0x8, BX
+	MOVL	BX, 0(SP)
+	NACL_SYSCALL(SYS_tls_init)
+	RET
+
+TEXT runtime·sigtramp(SB),NOSPLIT,$0
+	get_tls(CX)
+
+	// check that m exists
+	MOVL	m(CX), BX
+	CMPL	BX, $0
+	JNE	6(PC)
+	MOVL	$11, BX
+	MOVL	BX, 0(SP)
+	MOVL	$runtime·badsignal(SB), AX
+	CALL	AX
+	JMP 	sigtramp_ret
+
+	// save g
+	MOVL	g(CX), DI
+	MOVL	DI, 20(SP)
+	
+	// g = m->gsignal
+	MOVL	m_gsignal(BX), BX
+	MOVL	BX, g(CX)
+	
+	// copy arguments for sighandler
+	MOVL	$11, 0(SP) // signal
+	MOVL	$0, 4(SP) // siginfo
+	LEAL	ctxt+4(FP), AX
+	MOVL	AX, 8(SP) // context
+	MOVL	DI, 12(SP) // g
+
+	CALL	runtime·sighandler(SB)
+
+	// restore g
+	get_tls(CX)
+	MOVL	20(SP), BX
+	MOVL	BX, g(CX)
+
+sigtramp_ret:
+	// Enable exceptions again.
+	NACL_SYSCALL(SYS_exception_clear_flag)
+
+	// NaCl has abidcated its traditional operating system responsibility
+	// and declined to implement 'sigreturn'. Instead the only way to return
+	// to the execution of our program is to restore the registers ourselves.
+	// Unfortunately, that is impossible to do with strict fidelity, because
+	// there is no way to do the final update of PC that ends the sequence
+	// without either (1) jumping to a register, in which case the register ends
+	// holding the PC value instead of its intended value or (2) storing the PC
+	// on the stack and using RET, which imposes the requirement that SP is
+	// valid and that is okay to smash the word below it. The second would
+	// normally be the lesser of the two evils, except that on NaCl, the linker
+	// must rewrite RET into "POP reg; AND $~31, reg; JMP reg", so either way
+	// we are going to lose a register as a result of the incoming signal.
+	// Similarly, there is no way to restore EFLAGS; the usual way is to use
+	// POPFL, but NaCl rejects that instruction. We could inspect the bits and
+	// execute a sequence of instructions designed to recreate those flag
+	// settings, but that's a lot of work.
+	//
+	// Thankfully, Go's signal handlers never try to return directly to the
+	// executing code, so all the registers and EFLAGS are dead and can be
+	// smashed. The only registers that matter are the ones that are setting
+	// up for the simulated call that the signal handler has created.
+	// Today those registers are just PC and SP, but in case additional registers
+	// are relevant in the future (for example DX is the Go func context register)
+	// we restore as many registers as possible.
+	// 
+	// We smash BP, because that's what the linker smashes during RET.
+	//
+	LEAL	ctxt+4(FP), BP
+	ADDL	$64, BP
+	MOVL	0(BP), AX
+	MOVL	4(BP), CX
+	MOVL	8(BP), DX
+	MOVL	12(BP), BX
+	MOVL	16(BP), SP
+	// 20(BP) is saved BP, never to be seen again
+	MOVL	24(BP), SI
+	MOVL	28(BP), DI
+	// 36(BP) is saved EFLAGS, never to be seen again
+	MOVL	32(BP), BP // saved PC
+	JMP	BP

src/pkg/runtime/sys_nacl_amd64p32.s

+// Copyright 2013 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 "zasm_GOOS_GOARCH.h"
+#include "../../cmd/ld/textflag.h"
+#include "syscall_nacl.h"
+
+#define NACL_SYSCALL(code) \
+	MOVL $(0x10000 + ((code)<<5)), AX; CALL AX
+
+#define NACL_SYSJMP(code) \
+	MOVL $(0x10000 + ((code)<<5)), AX; JMP AX
+
+TEXT runtime·settls(SB),NOSPLIT,$0
+	MOVL	DI, GS // really BP
+	RET
+
+TEXT runtime·exit(SB),NOSPLIT,$0
+	MOVL arg1+0(FP), DI
+	NACL_SYSJMP(SYS_exit)
+
+TEXT runtime·exit1(SB),NOSPLIT,$0
+	MOVL arg1+0(FP), DI
+	NACL_SYSJMP(SYS_thread_exit)
+
+TEXT runtime·open(SB),NOSPLIT,$0
+	MOVL arg1+0(FP), DI
+	MOVL arg2+4(FP), SI
+	MOVL arg3+8(FP), DX
+	NACL_SYSJMP(SYS_open)
+
+TEXT runtime·close(SB),NOSPLIT,$0
+	MOVL arg1+0(FP), DI
+	NACL_SYSJMP(SYS_close)
+
+TEXT runtime·read(SB),NOSPLIT,$0
+	MOVL arg1+0(FP), DI
+	MOVL arg2+4(FP), SI
+	MOVL arg3+8(FP), DX
+	NACL_SYSJMP(SYS_read)
+
+TEXT syscall·naclWrite(SB), NOSPLIT, $16-20
+	MOVL arg1+0(FP), DI
+	MOVL arg2+4(FP), SI
+	MOVL arg3+8(FP), DX
+	MOVL DI, 0(SP)
+	MOVL SI, 4(SP)
+	MOVL DX, 8(SP)
+	CALL runtime·write(SB)
+	MOVL AX, ret+16(FP)
+	RET
+
+TEXT runtime·write(SB),NOSPLIT,$16-12
+	// If using fake time and writing to stdout or stderr,
+	// emit playback header before actual data.
+	MOVQ runtime·timens(SB), AX
+	CMPQ AX, $0
+	JEQ write
+	MOVL arg1+0(FP), DI
+	CMPL DI, $1
+	JEQ playback
+	CMPL DI, $2
+	JEQ playback
+
+write:
+	// Ordinary write.
+	MOVL arg1+0(FP), DI
+	MOVL arg2+4(FP), SI
+	MOVL arg3+8(FP), DX
+	NACL_SYSCALL(SYS_write)
+	RET
+
+	// Write with playback header.
+	// First, lock to avoid interleaving writes.
+playback:
+	MOVL $1, BX
+	XCHGL	runtime·writelock(SB), BX
+	CMPL BX, $0
+	JNE playback
+
+	// Playback header: 0 0 P B <8-byte time> <4-byte data length>
+	MOVL $(('B'<<24) | ('P'<<16)), 0(SP)
+	BSWAPQ AX
+	MOVQ AX, 4(SP)
+	MOVL arg3+8(FP), DX
+	BSWAPL DX
+	MOVL DX, 12(SP)
+	MOVL $1, DI // standard output
+	MOVL SP, SI
+	MOVL $16, DX
+	NACL_SYSCALL(SYS_write)
+
+	// Write actual data.
+	MOVL $1, DI // standard output
+	MOVL arg2+4(FP), SI
+	MOVL arg3+8(FP), DX
+	NACL_SYSCALL(SYS_write)
+
+	// Unlock.
+	MOVL	$0, runtime·writelock(SB)
+
+	RET
+
+TEXT runtime·nacl_exception_stack(SB),NOSPLIT,$0
+	MOVL arg1+0(FP), DI
+	MOVL arg2+4(FP), SI
+	NACL_SYSJMP(SYS_exception_stack)
+
+TEXT runtime·nacl_exception_handler(SB),NOSPLIT,$0
+	MOVL arg1+0(FP), DI
+	MOVL arg2+4(FP), SI
+	NACL_SYSJMP(SYS_exception_handler)
+
+TEXT runtime·nacl_sem_create(SB),NOSPLIT,$0
+	MOVL arg1+0(FP), DI
+	NACL_SYSJMP(SYS_sem_create)
+
+TEXT runtime·nacl_sem_wait(SB),NOSPLIT,$0
+	MOVL arg1+0(FP), DI
+	NACL_SYSJMP(SYS_sem_wait)
+
+TEXT runtime·nacl_sem_post(SB),NOSPLIT,$0
+	MOVL arg1+0(FP), DI
+	NACL_SYSJMP(SYS_sem_post)
+
+TEXT runtime·nacl_mutex_create(SB),NOSPLIT,$0
+	MOVL arg1+0(FP), DI
+	NACL_SYSJMP(SYS_mutex_create)
+
+TEXT runtime·nacl_mutex_lock(SB),NOSPLIT,$0
+	MOVL arg1+0(FP), DI
+	NACL_SYSJMP(SYS_mutex_lock)
+
+TEXT runtime·nacl_mutex_trylock(SB),NOSPLIT,$0
+	MOVL arg1+0(FP), DI
+	NACL_SYSJMP(SYS_mutex_trylock)
+
+TEXT runtime·nacl_mutex_unlock(SB),NOSPLIT,$0
+	MOVL arg1+0(FP), DI
+	NACL_SYSJMP(SYS_mutex_unlock)
+
+TEXT runtime·nacl_cond_create(SB),NOSPLIT,$0
+	MOVL arg1+0(FP), DI
+	NACL_SYSJMP(SYS_cond_create)
+
+TEXT runtime·nacl_cond_wait(SB),NOSPLIT,$0
+	MOVL arg1+0(FP), DI
+	MOVL arg2+4(FP), SI
+	NACL_SYSJMP(SYS_cond_wait)
+
+TEXT runtime·nacl_cond_signal(SB),NOSPLIT,$0
+	MOVL arg1+0(FP), DI
+	NACL_SYSJMP(SYS_cond_signal)
+
+TEXT runtime·nacl_cond_broadcast(SB),NOSPLIT,$0
+	MOVL arg1+0(FP), DI
+	NACL_SYSJMP(SYS_cond_broadcast)
+
+TEXT runtime·nacl_cond_timed_wait_abs(SB),NOSPLIT,$0
+	MOVL arg1+0(FP), DI
+	MOVL arg2+4(FP), SI
+	MOVL arg3+8(FP), DX
+	NACL_SYSJMP(SYS_cond_timed_wait_abs)
+
+TEXT runtime·nacl_thread_create(SB),NOSPLIT,$0
+	MOVL arg1+0(FP), DI
+	MOVL arg2+4(FP), SI
+	MOVL arg3+8(FP), DX
+	MOVL arg4+12(FP), CX
+	NACL_SYSJMP(SYS_thread_create)
+
+TEXT runtime·mstart_nacl(SB),NOSPLIT,$0
+	NACL_SYSCALL(SYS_tls_get)
+	SUBL	$8, AX
+	MOVL	AX, GS
+	JMP runtime·mstart(SB)
+
+TEXT runtime·nacl_nanosleep(SB),NOSPLIT,$0
+	MOVL arg1+0(FP), DI
+	MOVL arg2+4(FP), SI
+	NACL_SYSJMP(SYS_nanosleep)
+
+TEXT runtime·osyield(SB),NOSPLIT,$0
+	NACL_SYSJMP(SYS_sched_yield)
+
+TEXT runtime·mmap(SB),NOSPLIT,$8
+	MOVL arg1+0(FP), DI
+	MOVL arg2+4(FP), SI
+	MOVL arg3+8(FP), DX
+	MOVL arg4+12(FP), CX
+	MOVL arg5+16(FP), R8
+	MOVL arg6+20(FP), AX
+	MOVQ AX, 0(SP)
+	MOVL SP, R9
+	NACL_SYSCALL(SYS_mmap)
+	CMPL AX, $-4095
+	JNA 2(PC)
+	NEGL AX
+	RET
+
+TEXT time·now(SB),NOSPLIT,$16
+	MOVQ runtime·timens(SB), AX
+	CMPQ AX, $0
+	JEQ realtime
+	MOVQ $0, DX
+	MOVQ $1000000000, CX
+	DIVQ CX
+	MOVQ AX, sec+0(FP)
+	MOVL DX, nsec+8(FP)
+	RET
+realtime:
+	MOVL $0, DI // real time clock
+	LEAL 0(SP), AX
+	MOVL AX, SI // timespec
+	NACL_SYSCALL(SYS_clock_gettime)
+	MOVL 0(SP), AX // low 32 sec
+	MOVL 4(SP), CX // high 32 sec
+	MOVL 8(SP), BX // nsec
+
+	// sec is in AX, nsec in BX
+	MOVL	AX, sec+0(FP)
+	MOVL	CX, sec+4(FP)
+	MOVL	BX, nsec+8(FP)
+	RET
+
+TEXT syscall·now(SB),NOSPLIT,$0
+	JMP time·now(SB)
+
+TEXT runtime·nacl_clock_gettime(SB),NOSPLIT,$0
+	MOVL arg1+0(FP), DI
+	MOVL arg2+4(FP), SI
+	NACL_SYSJMP(SYS_clock_gettime)
+
+TEXT runtime·nanotime(SB),NOSPLIT,$16
+	MOVQ runtime·timens(SB), AX
+	CMPQ AX, $0
+	JEQ 2(PC)
+	RET
+	MOVL $0, DI // real time clock
+	LEAL 0(SP), AX
+	MOVL AX, SI // timespec
+	NACL_SYSCALL(SYS_clock_gettime)
+	MOVQ 0(SP), AX // sec
+	MOVL 8(SP), DX // nsec
+
+	// sec is in AX, nsec in DX
+	// return nsec in AX
+	IMULQ	$1000000000, AX
+	ADDQ	DX, AX
+	RET
+
+TEXT runtime·sigtramp(SB),NOSPLIT,$80
+	// restore TLS register at time of execution,
+	// in case it's been smashed.
+	// the TLS register is really BP, but for consistency
+	// with non-NaCl systems it is referred to here as GS.
+	// NOTE: Cannot use SYS_tls_get here (like we do in mstart_nacl),
+	// because the main thread never calls tls_set.
+	LEAL ctxt+0(FP), AX
+	MOVL (16*4+5*8)(AX), AX
+	MOVL	AX, GS
+
+	// check that m exists
+	get_tls(CX)
+	MOVL	m(CX), BX
+	
+	CMPL	BX, $0
+	JEQ	nom
+
+	// save g
+	MOVL	g(CX), DI
+	MOVL	DI, 20(SP)
+	
+	// g = m->gsignal
+	MOVL	m_gsignal(BX), BX
+	MOVL	BX, g(CX)
+
+//JMP debughandler
+
+	// copy arguments for sighandler
+	MOVL	$11, 0(SP) // signal
+	MOVL	$0, 4(SP) // siginfo
+	LEAL	ctxt+0(FP), AX
+	MOVL	AX, 8(SP) // context
+	MOVL	DI, 12(SP) // g
+
+	CALL	runtime·sighandler(SB)
+
+	// restore g
+	get_tls(CX)
+	MOVL	20(SP), BX
+	MOVL	BX, g(CX)
+
+sigtramp_ret:
+	// Enable exceptions again.
+	NACL_SYSCALL(SYS_exception_clear_flag)
+
+	// Restore registers as best we can. Impossible to do perfectly.
+	// See comment in sys_nacl_386.s for extended rationale.
+	LEAL	ctxt+0(FP), SI
+	ADDL	$64, SI
+	MOVQ	0(SI), AX
+	MOVQ	8(SI), CX
+	MOVQ	16(SI), DX
+	MOVQ	24(SI), BX
+	MOVL	32(SI), SP	// MOVL for SP sandboxing
+	// 40(SI) is saved BP aka GS, already restored above
+	// 48(SI) is saved SI, never to be seen again
+	MOVQ	56(SI), DI
+	MOVQ	64(SI), R8
+	MOVQ	72(SI), R9
+	MOVQ	80(SI), R10
+	MOVQ	88(SI), R11
+	MOVQ	96(SI), R12
+	MOVQ	104(SI), R13
+	MOVQ	112(SI), R14
+	// 120(SI) is R15, which is owned by Native Client and must not be modified
+	MOVQ	128(SI), SI // saved PC
+	// 136(SI) is saved EFLAGS, never to be seen again
+	JMP	SI
+
+debughandler:
+	// print basic information
+	LEAL	ctxt+0(FP), DI
+	MOVL	$runtime·sigtrampf(SB), AX
+	MOVL	AX, 0(SP)
+	MOVQ	(16*4+16*8)(DI), BX // rip
+	MOVQ	BX, 8(SP)
+	MOVQ	(16*4+0*8)(DI), BX // rax
+	MOVQ	BX, 16(SP)
+	MOVQ	(16*4+1*8)(DI), BX // rcx
+	MOVQ	BX, 24(SP)
+	MOVQ	(16*4+2*8)(DI), BX // rdx
+	MOVQ	BX, 32(SP)
+	MOVQ	(16*4+3*8)(DI), BX // rbx
+	MOVQ	BX, 40(SP)
+	MOVQ	(16*4+7*8)(DI), BX // rdi
+	MOVQ	BX, 48(SP)
+	MOVQ	(16*4+15*8)(DI), BX // r15
+	MOVQ	BX, 56(SP)
+	MOVQ	(16*4+4*8)(DI), BX // rsp
+	MOVQ	0(BX), BX
+	MOVQ	BX, 64(SP)
+	CALL	runtime·printf(SB)
+	
+	LEAL	ctxt+0(FP), DI
+	MOVQ	(16*4+16*8)(DI), BX // rip
+	MOVL	BX, 0(SP)
+	MOVQ	(16*4+4*8)(DI), BX // rsp
+	MOVL	BX, 4(SP)
+	MOVL	$0, 8(SP)	// lr
+	get_tls(CX)
+	MOVL	g(CX), BX
+	MOVL	BX, 12(SP)	// gp
+	CALL	runtime·traceback(SB)
+
+notls:
+	MOVL	0, AX
+	RET
+
+nom:
+	MOVL	0, AX
+	RET
+
+// cannot do real signal handling yet, because gsignal has not been allocated.
+MOVL $1, DI; NACL_SYSCALL(SYS_exit)
+
+TEXT runtime·nacl_sysinfo(SB),NOSPLIT,$16
+/*
+	MOVL	di+0(FP), DI
+	LEAL	12(DI), BX
+	MOVL	8(DI), AX
+	ADDL	4(DI), AX
+	ADDL	$2, AX
+	LEAL	(BX)(AX*4), BX
+	MOVL	BX, runtime·nacl_irt_query(SB)
+auxloop:
+	MOVL	0(BX), DX
+	CMPL	DX, $0
+	JNE	2(PC)
+	RET
+	CMPL	DX, $32
+	JEQ	auxfound
+	ADDL	$8, BX
+	JMP	auxloop
+auxfound:
+	MOVL	4(BX), BX
+	MOVL	BX, runtime·nacl_irt_query(SB)
+
+	LEAL	runtime·nacl_irt_basic_v0_1_str(SB), DI
+	LEAL	runtime·nacl_irt_basic_v0_1(SB), SI
+	MOVL	runtime·nacl_irt_basic_v0_1_size(SB), DX
+	MOVL	runtime·nacl_irt_query(SB), BX
+	CALL	BX
+
+	LEAL	runtime·nacl_irt_memory_v0_3_str(SB), DI
+	LEAL	runtime·nacl_irt_memory_v0_3(SB), SI
+	MOVL	runtime·nacl_irt_memory_v0_3_size(SB), DX
+	MOVL	runtime·nacl_irt_query(SB), BX
+	CALL	BX
+
+	LEAL	runtime·nacl_irt_thread_v0_1_str(SB), DI
+	LEAL	runtime·nacl_irt_thread_v0_1(SB), SI
+	MOVL	runtime·nacl_irt_thread_v0_1_size(SB), DX
+	MOVL	runtime·nacl_irt_query(SB), BX
+	CALL	BX
+
+	// TODO: Once we have a NaCl SDK with futex syscall support,
+	// try switching to futex syscalls and here load the
+	// nacl-irt-futex-0.1 table.
+*/
+	RET