Added enough arm related scaffolding to create a simple

hello.c program linking against the runtime.

R=rsc
APPROVED=rsc
DELTA=178  (175 added, 0 deleted, 3 changed)
OCL=29283
CL=29380

src/cmd/5l/5.out.h

@@ -34,7 +34,8 @@
 
 #define NOPROF		(1<<0)
 #define DUPOK		(1<<1)
-#define	ALLTHUMBS	(1<<2)
+#define NOSPLIT		(1<<2)
+#define	ALLTHUMBS	(1<<3)
 
 #define	REGRET		0
 #define	REGARG		0

src/runtime/Makefile

@@ -5,6 +5,7 @@
 # Set SIZE to 32 or 64.
 SIZE_386=32
 SIZE_amd64=64
+SIZE_arm=32
 SIZE=$(SIZE_$(GOARCH))
 
 # Setup CFLAGS.  Add -D_64BIT on 64-bit platforms (sorry).
@@ -14,6 +15,7 @@ CFLAGS=-I$(GOOS) -I$(GOOS)/$(GOARCH) -wF $(CFLAGS_$(SIZE))
 # Set O to right letter.
 O_386=8
 O_amd64=6
+O_arm=5
 O=$(O_$(GOARCH))
 
 # Tools
@@ -79,10 +81,10 @@ $(LIB): $(OFILES)
 $(OFILES): $(HFILES)
 
 nuke:
-	rm -f *.[68] *.a $(GOROOT)/lib/$(LIB)
+	rm -f *.[568] *.a $(GOROOT)/lib/$(LIB)
 
 clean:
-	rm -f *.[68] *.a runtime.acid cgo2c
+	rm -f *.[568] *.a runtime.acid cgo2c
 
 %.$O:	%.c
 	$(CC) $(CFLAGS) $<

src/runtime/arm/asm.s

@@ -0,0 +1,83 @@
+// Copyright 2009 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.
+
+TEXT _rt0_arm(SB),7,$0
+	// copy arguments forward on an even stack
+    //      	MOVW	$0(SP), R0
+    //	MOVL	0(SP), R1		// argc
+//	LEAL	4(SP), R1		// argv
+//	SUBL	$128, SP		// plenty of scratch
+//	ANDL	$~7, SP
+//	MOVL	AX, 120(SP)		// save argc, argv away
+//	MOVL	BX, 124(SP)
+
+
+// 	// write "go386\n"
+// 	PUSHL	$6
+// 	PUSHL	$hello(SB)
+// 	PUSHL	$1
+// 	CALL	sys·write(SB)
+// 	POPL	AX
+// 	POPL	AX
+// 	POPL	AX
+
+
+// 	CALL	ldt0setup(SB)
+
+	// set up %fs to refer to that ldt entry
+// 	MOVL	$(7*8+7), AX
+// 	MOVW	AX, FS
+
+// 	// store through it, to make sure it works
+// 	MOVL	$0x123, 0(FS)
+// 	MOVL	tls0(SB), AX
+// 	CMPL	AX, $0x123
+// 	JEQ	ok
+// 	MOVL	AX, 0
+// ok:
+
+// 	// set up m and g "registers"
+// 	// g is 0(FS), m is 4(FS)
+// 	LEAL	g0(SB), CX
+// 	MOVL	CX, 0(FS)
+// 	LEAL	m0(SB), AX
+// 	MOVL	AX, 4(FS)
+
+// 	// save m->g0 = g0
+// 	MOVL	CX, 0(AX)
+
+// 	// create istack out of the OS stack
+// 	LEAL	(-8192+104)(SP), AX	// TODO: 104?
+// 	MOVL	AX, 0(CX)	// 8(g) is stack limit (w 104b guard)
+// 	MOVL	SP, 4(CX)	// 12(g) is base
+// 	CALL	emptyfunc(SB)	// fault if stack check is wrong
+
+// 	// convention is D is always cleared
+// 	CLD
+
+// 	CALL	check(SB)
+
+// 	// saved argc, argv
+// 	MOVL	120(SP), AX
+// 	MOVL	AX, 0(SP)
+// 	MOVL	124(SP), AX
+// 	MOVL	AX, 4(SP)
+// 	CALL	args(SB)
+// 	CALL	osinit(SB)
+// 	CALL	schedinit(SB)
+
+// 	// create a new goroutine to start program
+// 	PUSHL	$mainstart(SB)	// entry
+// 	PUSHL	$8	// arg size
+// 	CALL	sys·newproc(SB)
+// 	POPL	AX
+// 	POPL	AX
+
+// 	// start this M
+// 	CALL	mstart(SB)
+
+	BL	main<EFBFBD>main(SB)
+	MOVW	$99, R0
+	SWI	$0x00900001
+

src/runtime/arm/closure.c

@@ -0,0 +1,4 @@
+// Copyright 2009 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.
+

src/runtime/linux/arm/defs.h

@@ -0,0 +1,27 @@
+// godefs -carm-gcc -f -I/usr/local/google/src/linux-2.6.28/arch/arm/include -f -I/usr/local/google/src/linux-2.6.28/include defs_arm.c
+
+// MACHINE GENERATED - DO NOT EDIT.
+
+// Constants
+enum {
+	PROT_NONE = 0,
+	PROT_READ = 0x1,
+	PROT_WRITE = 0x2,
+	PROT_EXEC = 0x4,
+	MAP_ANON = 0x20,
+	MAP_PRIVATE = 0x2,
+	SA_RESTART = 0x10000000,
+	SA_ONSTACK = 0x8000000,
+	SA_RESTORER = 0x4000000,
+	SA_SIGINFO = 0x4,
+};
+
+// Types
+#pragma pack on
+
+typedef struct Timespec Timespec;
+struct Timespec {
+	int32 tv_sec;
+	int32 tv_nsec;
+};
+#pragma pack off

src/runtime/linux/arm/rt0.s

@@ -0,0 +1,6 @@
+// Copyright 2009 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.
+
+TEXT	_rt0_arm_linux(SB),7,$0
+	B	_rt0_arm(SB)

src/runtime/linux/arm/signal.c

@@ -0,0 +1,4 @@
+// Copyright 2009 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.
+

src/runtime/linux/arm/sys.s

@@ -0,0 +1,15 @@
+// Copyright 2009 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.
+
+//
+// System calls and other sys.stuff for arm, Linux
+//
+
+TEXT write(SB),7,$0
+	MOVW	4(SP), R0
+	MOVW	8(SP), R1
+	MOVW	12(SP), R2
+    	SWI	$0x00900004  // syscall write
+	RET
+

src/runtime/linux/defs_arm.c

@@ -0,0 +1,54 @@
+// Copyright 2009 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.
+
+/*
+ * Input to godefs
+	godefs -carm-gcc -f -I/usr/local/google/src/linux-2.6.28/arch/arm/include -f
+ -I/usr/local/google/src/linux-2.6.28/include defs_arm.c >arm/defs.h
+
+ * Another input file for ARM defs.h
+ */
+
+#include <asm/signal.h>
+#include <asm/mman.h>
+#include <asm/sigcontext.h>
+#include <asm/ucontext.h>
+
+/*
+#include <sys/signal.h>
+#include <sys/mman.h>
+#include <ucontext.h>
+*/
+
+#include <time.h>
+
+enum {
+	$PROT_NONE = PROT_NONE,
+	$PROT_READ = PROT_READ,
+	$PROT_WRITE = PROT_WRITE,
+	$PROT_EXEC = PROT_EXEC,
+
+	$MAP_ANON = MAP_ANONYMOUS,
+	$MAP_PRIVATE = MAP_PRIVATE,
+
+	$SA_RESTART = SA_RESTART,
+	$SA_ONSTACK = SA_ONSTACK,
+	$SA_RESTORER = SA_RESTORER,
+	$SA_SIGINFO = SA_SIGINFO
+};
+
+
+
+
+//typedef struct _fpreg $Fpreg;
+//typedef struct _fpxreg $Fpxreg;
+//typedef struct _xmmreg $Xmmreg;
+//typedef struct _fpstate $Fpstate;
+typedef struct timespec $Timespec;
+//typedef struct timeval $Timeval;
+// typedef struct sigaction $Sigaction;
+// typedef siginfo_t $Siginfo;
+// typedef struct sigaltstack $Sigaltstack;
+// typedef struct sigcontext $Sigcontext;
+// typedef struct ucontext $Ucontext;