From 5f691cfaf1a6a4e2365fad423c1fe1f9b7975efb Mon Sep 17 00:00:00 2001
From: Shenghou Ma <minux@golang.org>
Date: Tue, 12 Aug 2014 19:48:49 -0400
Subject: [PATCH] [dev.power64] runtime: manually written parts for
 linux/power64 and linux/power64le, checkpoint

LGTM=rsc
R=rsc, iant
CC=golang-codereviews
https://golang.org/cl/122430043
---
 src/pkg/runtime/arch_power64.h           |  14 +
 src/pkg/runtime/arch_power64le.h         |  14 +
 src/pkg/runtime/asm_power64x.s           | 997 +++++++++++++++++++++++
 src/pkg/runtime/atomic_power64x.s        |  37 +
 src/pkg/runtime/memclr_power64x.s        |  20 +
 src/pkg/runtime/memmove_power64x.s       |  40 +
 src/pkg/runtime/rt0_linux_power64.s      |  17 +
 src/pkg/runtime/rt0_linux_power64le.s    |  14 +
 src/pkg/runtime/signal_linux_power64.h   |  49 ++
 src/pkg/runtime/signal_linux_power64le.h |  49 ++
 src/pkg/runtime/signal_power64x.c        | 137 ++++
 src/pkg/runtime/sys_linux_power64x.s     | 369 +++++++++
 src/pkg/runtime/sys_power64x.c           |  38 +
 13 files changed, 1795 insertions(+)
 create mode 100644 src/pkg/runtime/arch_power64.h
 create mode 100644 src/pkg/runtime/arch_power64le.h
 create mode 100644 src/pkg/runtime/asm_power64x.s
 create mode 100644 src/pkg/runtime/atomic_power64x.s
 create mode 100644 src/pkg/runtime/memclr_power64x.s
 create mode 100644 src/pkg/runtime/memmove_power64x.s
 create mode 100644 src/pkg/runtime/rt0_linux_power64.s
 create mode 100644 src/pkg/runtime/rt0_linux_power64le.s
 create mode 100644 src/pkg/runtime/signal_linux_power64.h
 create mode 100644 src/pkg/runtime/signal_linux_power64le.h
 create mode 100644 src/pkg/runtime/signal_power64x.c
 create mode 100644 src/pkg/runtime/sys_linux_power64x.s
 create mode 100644 src/pkg/runtime/sys_power64x.c

diff --git a/src/pkg/runtime/arch_power64.h b/src/pkg/runtime/arch_power64.h
new file mode 100644
index 0000000000..3d5b4943c7
--- /dev/null
+++ b/src/pkg/runtime/arch_power64.h
@@ -0,0 +1,14 @@
+// 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.
+
+enum {
+	thechar = '9',
+	BigEndian = 1,
+	CacheLineSize = 64,
+	RuntimeGogoBytes = 84,
+	PhysPageSize = 4096,
+	PCQuantum = 4,
+	Int64Align = 8
+};
+
diff --git a/src/pkg/runtime/arch_power64le.h b/src/pkg/runtime/arch_power64le.h
new file mode 100644
index 0000000000..d9241da98b
--- /dev/null
+++ b/src/pkg/runtime/arch_power64le.h
@@ -0,0 +1,14 @@
+// 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.
+
+enum {
+	thechar = '9',
+	BigEndian = 0,
+	CacheLineSize = 64,
+	RuntimeGogoBytes = 84,
+	PhysPageSize = 4096,
+	PCQuantum = 4,
+	Int64Align = 8
+};
+
diff --git a/src/pkg/runtime/asm_power64x.s b/src/pkg/runtime/asm_power64x.s
new file mode 100644
index 0000000000..52640f407a
--- /dev/null
+++ b/src/pkg/runtime/asm_power64x.s
@@ -0,0 +1,997 @@
+// 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.
+
+// +build power64 power64le
+
+#include "zasm_GOOS_GOARCH.h"
+#include "funcdata.h"
+#include "../../cmd/ld/textflag.h"
+
+TEXT _rt0_go(SB),NOSPLIT,$0
+	// initialize essential registers
+	BL	runtime·reginit(SB)
+
+	SUB	$24, R1
+	MOVW	R3, 8(R1) // argc
+	MOVD	R4, 16(R1) // argv
+
+	// create istack out of the given (operating system) stack.
+	// _cgo_init may update stackguard.
+	MOVD	$runtime·g0(SB), g
+	MOVD	$(-64*1024), R31
+	ADD	R31, R1, R3
+	MOVD	R3, g_stackguard(g)
+	MOVD	R3, g_stackguard0(g)
+	MOVD	R1, g_stackbase(g)
+
+	// TODO: if there is a _cgo_init, call it.
+	// TODO: add TLS
+
+	// set the per-goroutine and per-mach "registers"
+	MOVD	$runtime·m0(SB), R3
+
+	// save m->g0 = g0
+	MOVD	g, m_g0(R3)
+	// save m0 to g0->m
+	MOVD	R3, g_m(g)
+
+	BL	runtime·check(SB)
+
+	// args are already prepared
+	BL	runtime·args(SB)
+	BL	runtime·osinit(SB)
+	BL	runtime·hashinit(SB)
+	BL	runtime·schedinit(SB)
+
+	// create a new goroutine to start program
+	MOVD	$runtime·main·f(SB), R3		// entry
+	MOVDU	R3, -8(R1)
+	MOVDU	R0, -8(R1)
+	MOVDU	R0, -8(R1)
+	ARGSIZE(24)
+	BL	runtime·newproc(SB)
+	ARGSIZE(-1)
+	ADD	$24, R1
+
+	// start this M
+	BL	runtime·mstart(SB)
+
+	MOVD	R0, 1(R0)
+	RETURN
+
+DATA	runtime·main·f+0(SB)/8,$runtime·main(SB)
+GLOBL	runtime·main·f(SB),RODATA,$8
+
+TEXT runtime·breakpoint(SB),NOSPLIT,$-8-0
+	MOVD	R0, 2(R0) // TODO: TD
+	RETURN
+
+TEXT runtime·asminit(SB),NOSPLIT,$-8-0
+	RETURN
+
+TEXT runtime·reginit(SB),NOSPLIT,$-8-0
+	// set R0 to zero, it's expected by the toolchain
+	XOR R0, R0
+	// initialize essential FP registers
+	FMOVD	$4503601774854144.0, F27
+	FMOVD	$0.5, F29
+	FSUB	F29, F29, F28
+	FADD	F29, F29, F30
+	FADD	F30, F30, F31
+	RETURN
+
+/*
+ *  go-routine
+ */
+
+// void gosave(Gobuf*)
+// save state in Gobuf; setjmp
+TEXT runtime·gosave(SB), NOSPLIT, $-8-8
+	MOVD	gobuf+0(FP), R3
+	MOVD	R1, gobuf_sp(R3)
+	MOVD	LR, R31
+	MOVD	R31, gobuf_pc(R3)
+	MOVD	g, gobuf_g(R3)
+	MOVD	R0, gobuf_lr(R3)
+	MOVD	R0, gobuf_ret(R3)
+	MOVD	R0, gobuf_ctxt(R3)
+	RETURN
+
+// void gogo(Gobuf*)
+// restore state from Gobuf; longjmp
+TEXT runtime·gogo(SB), NOSPLIT, $-8-8
+	MOVD	gobuf+0(FP), R5
+	MOVD	gobuf_g(R5), g	// make sure g is not nil
+	MOVD	0(g), R4
+	MOVD	gobuf_sp(R5), R1
+	MOVD	gobuf_lr(R5), R31
+	MOVD	R31, LR
+	MOVD	gobuf_ret(R5), R3
+	MOVD	gobuf_ctxt(R5), R11
+	MOVD	R0, gobuf_sp(R5)
+	MOVD	R0, gobuf_ret(R5)
+	MOVD	R0, gobuf_lr(R5)
+	MOVD	R0, gobuf_ctxt(R5)
+	CMP	R0, R0 // set condition codes for == test, needed by stack split
+	MOVD	gobuf_pc(R5), R31
+	MOVD	R31, CTR
+	BR	(CTR)
+
+// void mcall(void (*fn)(G*))
+// Switch to m->g0's stack, call fn(g).
+// Fn must never return.  It should gogo(&g->sched)
+// to keep running g.
+TEXT runtime·mcall(SB), NOSPLIT, $-8-8
+	// Save caller state in g->sched
+	MOVD	R1, (g_sched+gobuf_sp)(g)
+	MOVD	LR, R31
+	MOVD	R31, (g_sched+gobuf_pc)(g)
+	MOVD	R0, (g_sched+gobuf_lr)(g)
+	MOVD	g, (g_sched+gobuf_g)(g)
+
+	// Switch to m->g0 & its stack, call fn.
+	MOVD	g, R3
+	MOVD	g_m(g), R8
+	MOVD	m_g0(R8), g
+	CMP	g, R3
+	BNE	2(PC)
+	BR	runtime·badmcall(SB)
+	MOVD	fn+0(FP), R4
+	MOVD	R4, CTR
+	MOVD	(g_sched+gobuf_sp)(g), R1
+	MOVDU	R3, -8(R1)
+	MOVDU	R0, -8(R1)
+	BL	(CTR)
+	BR	runtime·badmcall2(SB)
+
+/*
+ * support for morestack
+ */
+
+// Called during function prolog when more stack is needed.
+// Caller has already loaded:
+// R3: framesize, R4: argsize, R5: LR
+//
+// The traceback routines see morestack on a g0 as being
+// the top of a stack (for example, morestack calling newstack
+// calling the scheduler calling newm calling gc), so we must
+// record an argument size. For that purpose, it has no arguments.
+TEXT runtime·morestack(SB),NOSPLIT,$0-0
+	// Cannot grow scheduler stack (m->g0).
+	MOVD	g_m(g), R7
+	MOVD	m_g0(R7), R8
+	CMP	g, R8
+	BNE	2(PC)
+	BL	runtime·abort(SB)
+
+	MOVW	R3, m_moreframesize(R7)
+	MOVW	R4, m_moreargsize(R7)
+
+	// Called from f.
+	// Set g->sched to context in f.
+	MOVD	R11, (g_sched+gobuf_ctxt)(g)
+	MOVD	R1, (g_sched+gobuf_sp)(g)
+	MOVD	LR, R8
+	MOVD	R8, (g_sched+gobuf_pc)(g)
+	MOVD	R5, (g_sched+gobuf_lr)(g)
+
+	// Called from f.
+	// Set m->morebuf to f's caller.
+	MOVD	R5, (m_morebuf+gobuf_pc)(R7)	// f's caller's PC
+	MOVD	R1, (m_morebuf+gobuf_sp)(R7)	// f's caller's SP
+	MOVD	$8(R1), R8			// f's argument pointer
+	MOVD	R8, m_moreargp(R7)	
+	MOVD	g, (m_morebuf+gobuf_g)(R7)
+
+	// Call newstack on m->g0's stack.
+	MOVD	m_g0(R7), g
+	MOVD	(g_sched+gobuf_sp)(g), R1
+	BL	runtime·newstack(SB)
+
+	// Not reached, but make sure the return PC from the call to newstack
+	// is still in this function, and not the beginning of the next.
+	UNDEF
+
+TEXT runtime·morestack_noctxt(SB),NOSPLIT,$0-0
+	MOVD	R0, R11
+	BR	runtime·morestack(SB)
+
+// Called from panic.  Mimics morestack,
+// reuses stack growth code to create a frame
+// with the desired args running the desired function.
+//
+// func call(fn *byte, arg *byte, argsize uint32).
+TEXT runtime·newstackcall(SB), NOSPLIT, $-8-20
+	// Save our caller's state as the PC and SP to restore when
+	// returning from f.
+	MOVD	g_m(g), R5
+	MOVD	LR, R31
+	MOVD	R31, (m_morebuf+gobuf_pc)(R5)	// our caller's PC
+	MOVD	R1, (m_morebuf+gobuf_sp)(R5)	// our caller's SP
+	MOVD	g, (m_morebuf+gobuf_g)(R5)
+
+	// Save our own state as the PC and SP to restore if this
+	// goroutine needs to be restarted.
+	MOVD	$runtime·newstackcall(SB), R7
+	MOVD	R7, (g_sched+gobuf_pc)(g)
+	MOVD	LR, R31
+	MOVD	R31, (g_sched+gobuf_lr)(g)
+	MOVD	R1, (g_sched+gobuf_sp)(g)
+
+	// Set up morestack arguments to call f on a new stack.
+	// We set f's frame size to 1, as a hint to newstack that
+	// this is a call from runtime.newstackcall.
+	// If it turns out that f needs a larger frame than the
+	// default stack, f's usual stack growth prolog will
+	// allocate a new segment (and recopy the arguments).
+	MOVD	fn+0(FP), R7
+	MOVD	args+8(FP), R8
+	MOVW	n+16(FP), R9
+
+	MOVD	R7, m_cret(R5)
+	MOVD	R8, m_moreargp(R5)
+	MOVW	R9, m_moreargsize(R5)
+	MOVD	$1, R10
+	MOVD	R10, m_moreframesize(R5)
+
+	// call newstack on m->g0's stack
+	MOVD	m_g0(R5), g
+	MOVD	(g_sched+gobuf_sp)(g), R1
+	BR	runtime·newstack(SB)
+
+// reflect·call: call a function with the given argument list
+// func call(f *FuncVal, arg *byte, argsize uint32).
+// we don't have variable-sized frames, so we use a small number
+// of constant-sized-frame functions to encode a few bits of size in the pc.
+// Caution: ugly multiline assembly macros in your future!
+
+#define DISPATCH(NAME,MAXSIZE)		\
+	MOVD	$MAXSIZE, R31;		\
+	CMP	R3, R31;		\
+	BGT	4(PC);			\
+	MOVD	$runtime·NAME(SB), R31;	\
+	MOVD	R31, CTR;		\
+	BR	(CTR)
+
+// Note: can't just "BR runtime·NAME(SB)" - bad inlining results.
+TEXT reflect·call(SB), NOSPLIT, $0-24
+	MOVW argsize+16(FP), R3
+	DISPATCH(call16, 16)
+	DISPATCH(call32, 32)
+	DISPATCH(call64, 64)
+	DISPATCH(call128, 128)
+	DISPATCH(call256, 256)
+	DISPATCH(call512, 512)
+	DISPATCH(call1024, 1024)
+	DISPATCH(call2048, 2048)
+	DISPATCH(call4096, 4096)
+	DISPATCH(call8192, 8192)
+	DISPATCH(call16384, 16384)
+	DISPATCH(call32768, 32768)
+	DISPATCH(call65536, 65536)
+	DISPATCH(call131072, 131072)
+	DISPATCH(call262144, 262144)
+	DISPATCH(call524288, 524288)
+	DISPATCH(call1048576, 1048576)
+	DISPATCH(call2097152, 2097152)
+	DISPATCH(call4194304, 4194304)
+	DISPATCH(call8388608, 8388608)
+	DISPATCH(call16777216, 16777216)
+	DISPATCH(call33554432, 33554432)
+	DISPATCH(call67108864, 67108864)
+	DISPATCH(call134217728, 134217728)
+	DISPATCH(call268435456, 268435456)
+	DISPATCH(call536870912, 536870912)
+	DISPATCH(call1073741824, 1073741824)
+	MOVD	$runtime·badreflectcall(SB), R31
+	MOVD	R31, CTR
+	BR	(CTR)
+
+// Argument map for the callXX frames.  Each has one
+// stack map (for the single call) with 3 arguments.
+DATA gcargs_reflectcall<>+0x00(SB)/4, $1  // 1 stackmap
+DATA gcargs_reflectcall<>+0x04(SB)/4, $6  // 3 args
+DATA gcargs_reflectcall<>+0x08(SB)/4, $(const_BitsPointer+(const_BitsPointer<<2)+(const_BitsScalar<<4))
+GLOBL gcargs_reflectcall<>(SB),RODATA,$12
+
+// callXX frames have no locals
+DATA gclocals_reflectcall<>+0x00(SB)/4, $1  // 1 stackmap
+DATA gclocals_reflectcall<>+0x04(SB)/4, $0  // 0 locals
+GLOBL gclocals_reflectcall<>(SB),RODATA,$8
+
+#define CALLFN(NAME,MAXSIZE)			\
+TEXT runtime·NAME(SB), WRAPPER, $MAXSIZE-24;	\
+	FUNCDATA $FUNCDATA_ArgsPointerMaps,gcargs_reflectcall<>(SB);	\
+	FUNCDATA $FUNCDATA_LocalsPointerMaps,gclocals_reflectcall<>(SB);\
+	/* copy arguments to stack */		\
+	MOVD	argptr+8(FP), R3;		\
+	MOVW	argsize+16(FP), R4;		\
+	MOVD	R1, R5;				\
+	ADD	$(8-1), R5;			\
+	SUB	$1, R3;				\
+	ADD	R5, R4;				\
+	CMP	R5, R4;				\
+	BEQ	4(PC);				\
+	MOVBZU	1(R3), R6;			\
+	MOVBZU	R6, 1(R5);			\
+	BR	-4(PC);				\
+	/* call function */			\
+	MOVD	f+0(FP), R31;			\
+	MOVD	(R31), R31;			\
+	MOVD	R31, CTR;			\
+	PCDATA  $PCDATA_StackMapIndex, $0;	\
+	BL	(CTR);				\
+	/* copy return values back */		\
+	MOVD	argptr+8(FP), R3;		\
+	MOVW	argsize+16(FP), R4;		\
+	MOVW	retoffset+20(FP), R5;		\
+	MOVD	R1, R6;				\
+	ADD	$(8-1), R6;			\
+	ADD	R5, R6;				\
+	ADD	R5, R3;				\
+	SUB	R5, R4;				\
+	CMP	R4, $0;				\
+	BEQ	9(PC);				\
+	SUB	$1, R3;				\
+	SUB	$1, R6;				\
+	ADD	R3, R4;				\
+	CMP	R3, R4;				\
+	BEQ	4(PC);				\
+	MOVBZU	1(R3), R5;			\
+	MOVBZU	R5, 1(R6);			\
+	BR	-4(PC);				\
+	RETURN
+
+CALLFN(call16, 16)
+CALLFN(call32, 32)
+CALLFN(call64, 64)
+CALLFN(call128, 128)
+CALLFN(call256, 256)
+CALLFN(call512, 512)
+CALLFN(call1024, 1024)
+CALLFN(call2048, 2048)
+CALLFN(call4096, 4096)
+CALLFN(call8192, 8192)
+CALLFN(call16384, 16384)
+CALLFN(call32768, 32768)
+CALLFN(call65536, 65536)
+CALLFN(call131072, 131072)
+CALLFN(call262144, 262144)
+CALLFN(call524288, 524288)
+CALLFN(call1048576, 1048576)
+CALLFN(call2097152, 2097152)
+CALLFN(call4194304, 4194304)
+CALLFN(call8388608, 8388608)
+CALLFN(call16777216, 16777216)
+CALLFN(call33554432, 33554432)
+CALLFN(call67108864, 67108864)
+CALLFN(call134217728, 134217728)
+CALLFN(call268435456, 268435456)
+CALLFN(call536870912, 536870912)
+CALLFN(call1073741824, 1073741824)
+
+// Return point when leaving stack.
+//
+// Lessstack can appear in stack traces for the same reason
+// as morestack; in that context, it has 0 arguments.
+TEXT runtime·lessstack(SB), NOSPLIT, $-8-0
+	// Save return value in m->cret
+	MOVD	g_m(g), R5
+	MOVD	R3, m_cret(R5)
+
+	// Call oldstack on m->g0's stack.
+	MOVD	m_g0(R5), g
+	MOVD	(g_sched+gobuf_sp)(g), R1
+	BL	runtime·oldstack(SB)
+
+// bool cas(int32 *val, int32 old, int32 new)
+// Atomically:
+//	if(*val == old){
+//		*val = new;
+//		return 1;
+//	} else
+//		return 0;
+TEXT runtime·cas(SB), NOSPLIT, $0-16
+	MOVD	p+0(FP), R3
+	MOVW	old+8(FP), R4
+	MOVW	new+12(FP), R5
+	SYNC
+	LWAR	(R3), R6
+	CMPW	R6, R4
+	BNE	7(PC)
+	STWCCC	R5, (R3)
+	BNE	-5(PC)
+	MOVD	$1, R3
+	SYNC
+	ISYNC
+	RETURN
+	MOVD	$0, R3
+	BR	-4(PC)
+
+// bool	runtime·cas64(uint64 *val, uint64 old, uint64 new)
+// Atomically:
+//	if(*val == *old){
+//		*val = new;
+//		return 1;
+//	} else {
+//		return 0;
+//	}
+TEXT runtime·cas64(SB), NOSPLIT, $0-24
+	MOVD	p+0(FP), R3
+	MOVD	old+8(FP), R4
+	MOVD	new+16(FP), R5
+	SYNC
+	LDAR	(R3), R6
+	CMP	R6, R4
+	BNE	7(PC)
+	STDCCC	R5, (R3)
+	BNE	-5(PC)
+	MOVD	$1, R3
+	SYNC
+	ISYNC
+	RETURN
+	MOVD	$0, R3
+	BR	-4(PC)
+
+// bool casp(void **val, void *old, void *new)
+// Atomically:
+//	if(*val == old){
+//		*val = new;
+//		return 1;
+//	} else
+//		return 0;
+TEXT runtime·casp(SB), NOSPLIT, $0-24
+	BR runtime·cas64(SB)
+
+// uint32 xadd(uint32 volatile *val, int32 delta)
+// Atomically:
+//	*val += delta;
+//	return *val;
+TEXT runtime·xadd(SB), NOSPLIT, $0-12
+	MOVD	p+0(FP), R4
+	MOVW	delta+8(FP), R5
+	SYNC
+	LWAR	(R4), R3
+	ADD	R5, R3
+	STWCCC	R3, (R4)
+	BNE	-4(PC)
+	SYNC
+	ISYNC
+	MOVW	R3, R3
+	RETURN
+
+TEXT runtime·xadd64(SB), NOSPLIT, $0-16
+	MOVD	p+0(FP), R4
+	MOVD	delta+8(FP), R5
+	SYNC
+	LDAR	(R4), R3
+	ADD	R5, R3
+	STDCCC	R3, (R4)
+	BNE	-4(PC)
+	SYNC
+	ISYNC
+	RETURN
+
+TEXT runtime·xchg(SB), NOSPLIT, $0-12
+	MOVD	p+0(FP), R4
+	MOVW	new+8(FP), R5
+	SYNC
+	LWAR	(R4), R3
+	STWCCC	R5, (R4)
+	BNE	-3(PC)
+	SYNC
+	ISYNC
+	RETURN
+
+TEXT runtime·xchg64(SB), NOSPLIT, $0-16
+	MOVD	p+0(FP), R4
+	MOVD	new+8(FP), R5
+	SYNC
+	LDAR	(R4), R3
+	STDCCC	R5, (R4)
+	BNE	-3(PC)
+	SYNC
+	ISYNC
+	RETURN
+
+TEXT runtime·xchgp(SB), NOSPLIT, $0-16
+	BR	runtime·xchg64(SB)
+
+TEXT runtime·procyield(SB),NOSPLIT,$0-0
+	MOVD	R0, 17(R0)
+
+TEXT runtime·atomicstorep(SB), NOSPLIT, $0-16
+	BR	runtime·atomicstore64(SB)
+
+TEXT runtime·atomicstore(SB), NOSPLIT, $0-12
+	MOVD	0(FP), R3
+	MOVW	8(FP), R4
+	SYNC
+	MOVW	R4, 0(R3)
+	RETURN
+
+TEXT runtime·atomicstore64(SB), NOSPLIT, $0-16
+	MOVD	0(FP), R3
+	MOVD	8(FP), R4
+	SYNC
+	MOVD	R4, 0(R3)
+	RETURN
+
+// void jmpdefer(fn, sp);
+// called from deferreturn.
+// 1. grab stored LR for caller
+// 2. sub 4 bytes to get back to BL deferreturn
+// 3. BR to fn
+TEXT runtime·jmpdefer(SB), NOSPLIT, $-8-16
+	MOVD	0(R1), R31
+	SUB	$4, R31
+	MOVD	R31, LR
+
+	MOVD	fn+0(FP), R11
+	MOVD	argp+8(FP), R1
+	SUB	$8, R1
+	MOVD	0(R11), R3
+	MOVD	R3, CTR
+	BR	(CTR)
+
+// Save state of caller into g->sched. Smashes R31.
+TEXT gosave<>(SB),NOSPLIT,$-8
+	MOVD	LR, R31
+	MOVD	R31, (g_sched+gobuf_pc)(g)
+	MOVD	R1, (g_sched+gobuf_sp)(g)
+	MOVD	R0, (g_sched+gobuf_lr)(g)
+	MOVD	R0, (g_sched+gobuf_ret)(g)
+	MOVD	R0, (g_sched+gobuf_ctxt)(g)
+	RETURN
+
+// asmcgocall(void(*fn)(void*), void *arg)
+// Call fn(arg) on the scheduler stack,
+// aligned appropriately for the gcc ABI.
+// See cgocall.c for more details.
+TEXT runtime·asmcgocall(SB),NOSPLIT,$0-16
+	MOVD	R0, 21(R0)
+
+// cgocallback(void (*fn)(void*), void *frame, uintptr framesize)
+// Turn the fn into a Go func (by taking its address) and call
+// cgocallback_gofunc.
+TEXT runtime·cgocallback(SB),NOSPLIT,$24-24
+	MOVD	R0, 22(R0)
+
+// cgocallback_gofunc(FuncVal*, void *frame, uintptr framesize)
+// See cgocall.c for more details.
+TEXT runtime·cgocallback_gofunc(SB),NOSPLIT,$8-24
+	MOVD	R0, 23(R0)
+
+// void setg(G*); set g. for use by needm.
+TEXT runtime·setg(SB), NOSPLIT, $0-16
+	MOVD	R0, 24(R0)
+
+// void setg_gcc(G*); set g called from gcc.
+TEXT setg_gcc<>(SB),NOSPLIT,$0
+	MOVD	R0, 25(R0)
+
+TEXT runtime·getcallerpc(SB),NOSPLIT,$-8-8
+	MOVD	0(R1), R3
+	RETURN
+
+TEXT runtime·gogetcallerpc(SB),NOSPLIT,$-8-16
+	MOVD	0(R1), R3
+	MOVD	R3,ret+8(FP)
+	RETURN
+
+TEXT runtime·setcallerpc(SB),NOSPLIT,$-8-16
+	MOVD	x+8(FP),R3		// addr of first arg
+	MOVD	R3, 0(R1)		// set calling pc
+	RETURN
+
+TEXT runtime·getcallersp(SB),NOSPLIT,$0-8
+	MOVD	sp+0(FP), R3
+	SUB	$8, R3
+	RETURN
+
+TEXT runtime·abort(SB),NOSPLIT,$-4-0
+	MOVW	(R0), R0
+	UNDEF
+
+#define	TBRL	268
+#define	TBRU	269		/* Time base Upper/Lower */
+
+// int64 runtime·cputicks(void)
+TEXT runtime·cputicks(SB),NOSPLIT,$0-0
+	MOVW	SPR(TBRU), R4
+	MOVW	SPR(TBRL), R3
+	MOVW	SPR(TBRU), R5
+	CMPW	R4, R5
+	BNE	-4(PC)
+	SLD	$32, R5
+	OR	R5, R3
+	RETURN
+
+TEXT runtime·stackguard(SB),NOSPLIT,$0-16
+	MOVD	R1, R3
+	MOVD	R3, sp+0(FP)
+	MOVD	g_stackguard(g), R3
+	MOVD	R3, limit+8(FP)
+	RETURN
+
+GLOBL runtime·tls0(SB), $64
+
+// AES hashing not implemented for Power
+TEXT runtime·aeshash(SB),NOSPLIT,$-8-0
+	MOVW	(R0), R1
+TEXT runtime·aeshash32(SB),NOSPLIT,$-8-0
+	MOVW	(R0), R1
+TEXT runtime·aeshash64(SB),NOSPLIT,$-8-0
+	MOVW	(R0), R1
+TEXT runtime·aeshashstr(SB),NOSPLIT,$-8-0
+	MOVW	(R0), R1
+
+TEXT runtime·memeq(SB),NOSPLIT,$-8-24
+	MOVD	a+0(FP), R3
+	MOVD	b+8(FP), R4
+	MOVD	count+16(FP), R5
+	SUB	$1, R3
+	SUB	$1, R4
+	ADD	R3, R5, R8
+_next:
+	CMP	R3, R8
+	BNE	3(PC)
+	MOVD	$1, R3
+	RETURN
+	MOVBZU	1(R3), R6
+	MOVBZU	1(R4), R7
+	CMP	R6, R7
+	BEQ	_next
+
+	MOVD	$0, R3
+	RETURN
+
+TEXT runtime·gomemeq(SB),NOSPLIT,$0-25
+	MOVD	a+0(FP), R3
+	MOVD	b+8(FP), R4
+	MOVD	count+16(FP), R5
+	SUB	$1, R3
+	SUB	$1, R4
+	ADD	R3, R5, R8
+_next2:
+	CMP	R3, R8
+	BNE	4(PC)
+	MOVD	$1, R3
+	MOVB	R3, ret+24(FP)
+	RETURN
+	MOVBZU	1(R3), R6
+	MOVBZU	1(R4), R7
+	CMP	R6, R7
+	BEQ	_next2
+
+	MOVB	R0, ret+24(FP)
+	RETURN
+
+// eqstring tests whether two strings are equal.
+// See runtime_test.go:eqstring_generic for
+// equivlaent Go code.
+TEXT runtime·eqstring(SB),NOSPLIT,$0-33
+	MOVD	s1len+8(FP), R4
+	MOVD	s2len+24(FP), R5
+	CMP	R4, R5
+	BNE	str_noteq
+
+	MOVD	s1str+0(FP), R3
+	MOVD	s2str+16(FP), R4
+	SUB	$1, R3
+	SUB	$1, R4
+	ADD	R3, R5, R8
+eq_next:
+	CMP	R3, R8
+	BNE	4(PC)
+	MOVD	$1, R3
+	MOVB	R3, ret+32(FP)
+	RETURN
+	MOVBZU	1(R3), R6
+	MOVBZU	1(R4), R7
+	CMP	R6, R7
+	BEQ	eq_next
+str_noteq:
+	MOVB	R0, ret+32(FP)
+	RETURN
+
+// TODO: share code with memeq?
+TEXT bytes·Equal(SB),NOSPLIT,$0-49
+	MOVD	a_len+8(FP), R3
+	MOVD	b_len+32(FP), R4
+
+	CMP	R3, R4		// unequal lengths are not equal
+	BNE	_notequal
+
+	MOVD	a+0(FP), R5
+	MOVD	b+24(FP), R6
+	SUB	$1, R5
+	SUB	$1, R6
+	ADD	R5, R3		// end-1
+
+_byteseq_next:
+	CMP	R5, R3
+	BEQ	_equal		// reached the end
+	MOVBZU	1(R5), R4
+	MOVBZU	1(R6), R7
+	CMP	R4, R7
+	BEQ	_byteseq_next
+
+_notequal:
+	MOVBZ	R0, ret+48(FP)
+	RETURN
+
+_equal:
+	MOVD	$1, R3
+	MOVBZ	R3, ret+48(FP)
+	RETURN
+
+TEXT bytes·IndexByte(SB),NOSPLIT,$0-40
+	MOVD	s+0(FP), R3
+	MOVD	s_len+8(FP), R4
+	MOVBZ	c+24(FP), R5	// byte to find
+	SUB	$1, R3
+	MOVD	R3, R6		// store base-1 for later
+	ADD	R3, R4		// end-1
+
+_index_loop:
+	CMP	R3, R4
+	BEQ	_index_notfound
+	MOVBZU	1(R3), R7
+	CMP	R7, R5
+	BNE	_index_loop
+
+	SUB	R6, R3		// remove base
+	MOVD	R3, ret+32(FP)
+	RETURN
+
+_index_notfound:
+	MOVW	$-1, R3
+	MOVW	R3, ret+32(FP)
+	RETURN
+
+TEXT strings·IndexByte(SB),NOSPLIT,$0
+	MOVD	p+0(FP), R3
+	MOVD	b_len+8(FP), R4
+	MOVBZ	c+16(FP), R5	// byte to find
+	SUB	$1, R3
+	MOVD	R3, R6		// store base-1 for later
+	ADD	R3, R4		// end-1
+
+_index2_loop:
+	CMP	R3, R4
+	BEQ	_index2_notfound
+	MOVBZU	1(R3), R7
+	CMP	R7, R5
+	BNE	_index2_loop
+
+	SUB	R6, R3		// remove base
+	MOVD	R3, ret+24(FP)
+	RETURN
+
+_index2_notfound:
+	MOVW	$-1, R3
+	MOVW	R3, ret+24(FP)
+	RETURN
+
+
+TEXT runtime·timenow(SB), NOSPLIT, $0-0
+	BR	time·now(SB)
+
+// A Duff's device for zeroing memory.
+// The compiler jumps to computed addresses within
+// this routine to zero chunks of memory.  Do not
+// change this code without also changing the code
+// in ../../cmd/9g/ggen.c:/^clearfat.
+// R0: always zero
+// R3 (aka REGRT1): ptr to memory to be zeroed - 8
+// R3 is updated as a side effect.
+TEXT runtime·duffzero(SB), NOSPLIT, $-8-0
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	MOVDU	R0, 8(R3)
+	RETURN
+
+TEXT runtime·fastrand2(SB), NOSPLIT, $0-4
+	MOVD	g_m(g), R4
+	MOVD	m_fastrand(R4), R3
+	ADD	R3, R3
+	CMP	R3, $0
+	BGE	2(PC)
+	XOR	$0x88888eef, R3
+	MOVD	R3, m_fastrand(R4)
+	MOVD	R3, ret+0(FP)
+	RETURN
+
+// The gohash and goeq trampolines are necessary while we have
+// both Go and C calls to alg functions.  Once we move all call
+// sites to Go, we can redo the hash/eq functions to use the
+// Go calling convention and remove these.
+
+// convert call to:
+//   func (alg unsafe.Pointer, p unsafe.Pointer, size uintpr, seed uintptr) uintptr
+// to:
+//   func (hash *uintptr, size uintptr, p unsafe.Pointer)
+TEXT runtime·gohash(SB), NOSPLIT, $24-40
+	FUNCDATA $FUNCDATA_ArgsPointerMaps,gcargs_gohash<>(SB)
+	FUNCDATA $FUNCDATA_LocalsPointerMaps,gclocals_gohash<>(SB)
+	MOVD	a+0(FP), R3
+	MOVD	alg_hash(R3), R3
+	MOVD	R3, CTR
+	MOVD	p+8(FP), R4
+	MOVD	size+16(FP), R5
+	MOVD	seed+24(FP), R6
+	MOVD	R6, ret+32(FP)
+	MOVD	$ret+32(FP), R7
+	MOVD	R7, 8(R1)
+	MOVD	R5, 16(R1)
+	MOVD	R4, 24(R1)
+	PCDATA  $PCDATA_StackMapIndex, $0
+	BL	(CTR)
+	RETURN
+
+DATA gcargs_gohash<>+0x00(SB)/4, $1  // 1 stackmap
+DATA gcargs_gohash<>+0x04(SB)/4, $10  // 5 args
+DATA gcargs_gohash<>+0x08(SB)/4, $(const_BitsPointer+(const_BitsPointer<<2))
+GLOBL gcargs_gohash<>(SB),RODATA,$12
+
+DATA gclocals_gohash<>+0x00(SB)/4, $1  // 1 stackmap
+DATA gclocals_gohash<>+0x04(SB)/4, $0  // 0 locals
+GLOBL gclocals_gohash<>(SB),RODATA,$8
+
+// convert call to:
+//   func (alg unsafe.Pointer, p, q unsafe.Pointer, size uintptr) bool
+// to:
+//   func (eq *bool, size uintptr, p, q unsafe.Pointer)
+TEXT runtime·goeq(SB), NOSPLIT, $32-33
+	FUNCDATA $FUNCDATA_ArgsPointerMaps,gcargs_goeq<>(SB)
+	FUNCDATA $FUNCDATA_LocalsPointerMaps,gclocals_goeq<>(SB)
+	MOVD	alg+0(FP), R3
+	MOVD	alg_equal(R3), R3
+	MOVD	R3, CTR
+	MOVD	p+8(FP), R4
+	MOVD	q+16(FP), R5
+	MOVD	size+24(FP), R6
+	MOVD	$ret+32(FP), R7
+	MOVD	R7, 8(R1)
+	MOVD	R6, 16(R1)
+	MOVD	R5, 24(R1)
+	MOVD	R4, 32(R1)
+	PCDATA  $PCDATA_StackMapIndex, $0
+	BL	(CTR)
+	RETURN
+
+DATA gcargs_goeq<>+0x00(SB)/4, $1  // 1 stackmap
+DATA gcargs_goeq<>+0x04(SB)/4, $10  // 5 args
+DATA gcargs_goeq<>+0x08(SB)/4, $(const_BitsPointer+(const_BitsPointer<<2)+(const_BitsPointer<<4))
+GLOBL gcargs_goeq<>(SB),RODATA,$12
+
+DATA gclocals_goeq<>+0x00(SB)/4, $1  // 1 stackmap
+DATA gclocals_goeq<>+0x04(SB)/4, $0  // 0 locals
+GLOBL gclocals_goeq<>(SB),RODATA,$8
diff --git a/src/pkg/runtime/atomic_power64x.s b/src/pkg/runtime/atomic_power64x.s
new file mode 100644
index 0000000000..c08590ac97
--- /dev/null
+++ b/src/pkg/runtime/atomic_power64x.s
@@ -0,0 +1,37 @@
+// Copyright 2014 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build power64 power64le
+
+#include "../../cmd/ld/textflag.h"
+
+// uint32 runtime·atomicload(uint32 volatile* addr)
+TEXT ·atomicload(SB),NOSPLIT,$-8-8
+	MOVD	0(FP), R3
+	SYNC
+	MOVWZ	0(R3), R3
+	CMPW	R3, R3, CR7
+	BC	4, 30, 1(PC) // bne- cr7,0x4
+	ISYNC
+	RETURN
+
+// uint64 runtime·atomicload64(uint64 volatile* addr)
+TEXT ·atomicload64(SB),NOSPLIT,$-8-8
+	MOVD	0(FP), R3
+	SYNC
+	MOVD	0(R3), R3
+	CMP	R3, R3, CR7
+	BC	4, 30, 1(PC) // bne- cr7,0x4
+	ISYNC
+	RETURN
+
+// void *runtime·atomicloadp(void *volatile *addr)
+TEXT ·atomicloadp(SB),NOSPLIT,$-8-8
+	MOVD	0(FP), R3
+	SYNC
+	MOVD	0(R3), R3
+	CMP	R3, R3, CR7
+	BC	4, 30, 1(PC) // bne- cr7,0x4
+	ISYNC
+	RETURN
diff --git a/src/pkg/runtime/memclr_power64x.s b/src/pkg/runtime/memclr_power64x.s
new file mode 100644
index 0000000000..4a2437c209
--- /dev/null
+++ b/src/pkg/runtime/memclr_power64x.s
@@ -0,0 +1,20 @@
+// 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.
+
+// +build power64 power64le
+
+#include "../../cmd/ld/textflag.h"
+
+// void runtime·memclr(void*, uintptr)
+TEXT runtime·memclr(SB),NOSPLIT,$0-16
+	MOVD	ptr+0(FP), R3
+	MOVD	n+8(FP), R4
+	CMP	R4, $0
+	BEQ	done
+	SUB	$1, R3
+	MOVD	R4, CTR
+	MOVBU	R0, 1(R3)
+	BC	25, 0, -1(PC) // bdnz+ $-4
+done:
+	RETURN
diff --git a/src/pkg/runtime/memmove_power64x.s b/src/pkg/runtime/memmove_power64x.s
new file mode 100644
index 0000000000..b618f0ad7b
--- /dev/null
+++ b/src/pkg/runtime/memmove_power64x.s
@@ -0,0 +1,40 @@
+// 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.
+
+// +build power64 power64le
+
+#include "../../cmd/ld/textflag.h"
+
+// void runtime·memmove(void*, void*, uintptr)
+TEXT runtime·memmove(SB), NOSPLIT, $-8-24
+	MOVD	to+0(FP), R3
+	MOVD	from+8(FP), R4
+	MOVD	n+16(FP), R5
+	CMP	R5, $0
+	BNE	check
+	RETURN
+
+check:
+	CMP	R3, R4
+	BGT	backward
+
+	SUB	$1, R3
+	ADD	R3, R5
+	SUB	$1, R4
+loop:
+	MOVBU	1(R4), R6
+	MOVBU	R6, 1(R3)
+	CMP	R3, R5
+	BNE	loop
+	RETURN
+
+backward:
+	ADD	R5, R4
+	ADD	R3, R5
+loop1:
+	MOVBU	-1(R4), R6
+	MOVBU	R6, -1(R5)
+	CMP	R3, R5
+	BNE	loop1
+	RETURN
diff --git a/src/pkg/runtime/rt0_linux_power64.s b/src/pkg/runtime/rt0_linux_power64.s
new file mode 100644
index 0000000000..e944bcdbf8
--- /dev/null
+++ b/src/pkg/runtime/rt0_linux_power64.s
@@ -0,0 +1,17 @@
+#include "../../cmd/ld/textflag.h"
+
+// actually a function descriptor for _main<>(SB)
+TEXT _rt0_power64_linux(SB),7,$0
+	DWORD $_main<>(SB)
+	DWORD $0
+	DWORD $0
+
+TEXT _main<>(SB),NOSPLIT,$-8
+	MOVD 0(R1), R3 // argc
+	ADD $8, R1, R4 // argv
+	BR main(SB)
+
+TEXT main(SB),NOSPLIT,$-8
+	MOVD	$_rt0_go(SB), R31
+	MOVD	R31, CTR
+	BR	(CTR)
diff --git a/src/pkg/runtime/rt0_linux_power64le.s b/src/pkg/runtime/rt0_linux_power64le.s
new file mode 100644
index 0000000000..051815dbce
--- /dev/null
+++ b/src/pkg/runtime/rt0_linux_power64le.s
@@ -0,0 +1,14 @@
+#include "../../cmd/ld/textflag.h"
+
+TEXT _rt0_power64le_linux(SB),7,$0
+	BR _main<>(SB)
+
+TEXT _main<>(SB),NOSPLIT,$-8
+	MOVD 0(R1), R3 // argc
+	ADD $8, R1, R4 // argv
+	BR main(SB)
+
+TEXT main(SB),NOSPLIT,$-8
+	MOVD	$_rt0_go(SB), R31
+	MOVD	R31, CTR
+	BR	(CTR)
diff --git a/src/pkg/runtime/signal_linux_power64.h b/src/pkg/runtime/signal_linux_power64.h
new file mode 100644
index 0000000000..8406489209
--- /dev/null
+++ b/src/pkg/runtime/signal_linux_power64.h
@@ -0,0 +1,49 @@
+// 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.
+
+#define SIG_REGS(ctxt) (*((Sigcontext*)&((Ucontext*)(ctxt))->uc_mcontext)->regs)
+
+#define SIG_R0(info, ctxt) (SIG_REGS(ctxt).gpr[0])
+#define SIG_R1(info, ctxt) (SIG_REGS(ctxt).gpr[1])
+#define SIG_R2(info, ctxt) (SIG_REGS(ctxt).gpr[2])
+#define SIG_R3(info, ctxt) (SIG_REGS(ctxt).gpr[3])
+#define SIG_R4(info, ctxt) (SIG_REGS(ctxt).gpr[4])
+#define SIG_R5(info, ctxt) (SIG_REGS(ctxt).gpr[5])
+#define SIG_R6(info, ctxt) (SIG_REGS(ctxt).gpr[6])
+#define SIG_R7(info, ctxt) (SIG_REGS(ctxt).gpr[7])
+#define SIG_R8(info, ctxt) (SIG_REGS(ctxt).gpr[8])
+#define SIG_R9(info, ctxt) (SIG_REGS(ctxt).gpr[9])
+#define SIG_R10(info, ctxt) (SIG_REGS(ctxt).gpr[10])
+#define SIG_R11(info, ctxt) (SIG_REGS(ctxt).gpr[11])
+#define SIG_R12(info, ctxt) (SIG_REGS(ctxt).gpr[12])
+#define SIG_R13(info, ctxt) (SIG_REGS(ctxt).gpr[13])
+#define SIG_R14(info, ctxt) (SIG_REGS(ctxt).gpr[14])
+#define SIG_R15(info, ctxt) (SIG_REGS(ctxt).gpr[15])
+#define SIG_R16(info, ctxt) (SIG_REGS(ctxt).gpr[16])
+#define SIG_R17(info, ctxt) (SIG_REGS(ctxt).gpr[17])
+#define SIG_R18(info, ctxt) (SIG_REGS(ctxt).gpr[18])
+#define SIG_R19(info, ctxt) (SIG_REGS(ctxt).gpr[19])
+#define SIG_R20(info, ctxt) (SIG_REGS(ctxt).gpr[20])
+#define SIG_R21(info, ctxt) (SIG_REGS(ctxt).gpr[21])
+#define SIG_R22(info, ctxt) (SIG_REGS(ctxt).gpr[22])
+#define SIG_R23(info, ctxt) (SIG_REGS(ctxt).gpr[23])
+#define SIG_R24(info, ctxt) (SIG_REGS(ctxt).gpr[24])
+#define SIG_R25(info, ctxt) (SIG_REGS(ctxt).gpr[25])
+#define SIG_R26(info, ctxt) (SIG_REGS(ctxt).gpr[26])
+#define SIG_R27(info, ctxt) (SIG_REGS(ctxt).gpr[27])
+#define SIG_R28(info, ctxt) (SIG_REGS(ctxt).gpr[28])
+#define SIG_R29(info, ctxt) (SIG_REGS(ctxt).gpr[29])
+#define SIG_R30(info, ctxt) (SIG_REGS(ctxt).gpr[30])
+#define SIG_R31(info, ctxt) (SIG_REGS(ctxt).gpr[31])
+
+#define SIG_SP(info, ctxt) (SIG_REGS(ctxt).gpr[1])
+#define SIG_PC(info, ctxt) (SIG_REGS(ctxt).nip)
+#define SIG_TRAP(info, ctxt) (SIG_REGS(ctxt).trap)
+#define SIG_CTR(info, ctxt) (SIG_REGS(ctxt).ctr)
+#define SIG_LINK(info, ctxt) (SIG_REGS(ctxt).link)
+#define SIG_XER(info, ctxt) (SIG_REGS(ctxt).xer)
+#define SIG_CCR(info, ctxt) (SIG_REGS(ctxt).ccr)
+
+#define SIG_CODE0(info, ctxt) ((uintptr)(info)->si_code)
+#define SIG_FAULT(info, ctxt) (SIG_REGS(ctxt).dar)
diff --git a/src/pkg/runtime/signal_linux_power64le.h b/src/pkg/runtime/signal_linux_power64le.h
new file mode 100644
index 0000000000..8406489209
--- /dev/null
+++ b/src/pkg/runtime/signal_linux_power64le.h
@@ -0,0 +1,49 @@
+// 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.
+
+#define SIG_REGS(ctxt) (*((Sigcontext*)&((Ucontext*)(ctxt))->uc_mcontext)->regs)
+
+#define SIG_R0(info, ctxt) (SIG_REGS(ctxt).gpr[0])
+#define SIG_R1(info, ctxt) (SIG_REGS(ctxt).gpr[1])
+#define SIG_R2(info, ctxt) (SIG_REGS(ctxt).gpr[2])
+#define SIG_R3(info, ctxt) (SIG_REGS(ctxt).gpr[3])
+#define SIG_R4(info, ctxt) (SIG_REGS(ctxt).gpr[4])
+#define SIG_R5(info, ctxt) (SIG_REGS(ctxt).gpr[5])
+#define SIG_R6(info, ctxt) (SIG_REGS(ctxt).gpr[6])
+#define SIG_R7(info, ctxt) (SIG_REGS(ctxt).gpr[7])
+#define SIG_R8(info, ctxt) (SIG_REGS(ctxt).gpr[8])
+#define SIG_R9(info, ctxt) (SIG_REGS(ctxt).gpr[9])
+#define SIG_R10(info, ctxt) (SIG_REGS(ctxt).gpr[10])
+#define SIG_R11(info, ctxt) (SIG_REGS(ctxt).gpr[11])
+#define SIG_R12(info, ctxt) (SIG_REGS(ctxt).gpr[12])
+#define SIG_R13(info, ctxt) (SIG_REGS(ctxt).gpr[13])
+#define SIG_R14(info, ctxt) (SIG_REGS(ctxt).gpr[14])
+#define SIG_R15(info, ctxt) (SIG_REGS(ctxt).gpr[15])
+#define SIG_R16(info, ctxt) (SIG_REGS(ctxt).gpr[16])
+#define SIG_R17(info, ctxt) (SIG_REGS(ctxt).gpr[17])
+#define SIG_R18(info, ctxt) (SIG_REGS(ctxt).gpr[18])
+#define SIG_R19(info, ctxt) (SIG_REGS(ctxt).gpr[19])
+#define SIG_R20(info, ctxt) (SIG_REGS(ctxt).gpr[20])
+#define SIG_R21(info, ctxt) (SIG_REGS(ctxt).gpr[21])
+#define SIG_R22(info, ctxt) (SIG_REGS(ctxt).gpr[22])
+#define SIG_R23(info, ctxt) (SIG_REGS(ctxt).gpr[23])
+#define SIG_R24(info, ctxt) (SIG_REGS(ctxt).gpr[24])
+#define SIG_R25(info, ctxt) (SIG_REGS(ctxt).gpr[25])
+#define SIG_R26(info, ctxt) (SIG_REGS(ctxt).gpr[26])
+#define SIG_R27(info, ctxt) (SIG_REGS(ctxt).gpr[27])
+#define SIG_R28(info, ctxt) (SIG_REGS(ctxt).gpr[28])
+#define SIG_R29(info, ctxt) (SIG_REGS(ctxt).gpr[29])
+#define SIG_R30(info, ctxt) (SIG_REGS(ctxt).gpr[30])
+#define SIG_R31(info, ctxt) (SIG_REGS(ctxt).gpr[31])
+
+#define SIG_SP(info, ctxt) (SIG_REGS(ctxt).gpr[1])
+#define SIG_PC(info, ctxt) (SIG_REGS(ctxt).nip)
+#define SIG_TRAP(info, ctxt) (SIG_REGS(ctxt).trap)
+#define SIG_CTR(info, ctxt) (SIG_REGS(ctxt).ctr)
+#define SIG_LINK(info, ctxt) (SIG_REGS(ctxt).link)
+#define SIG_XER(info, ctxt) (SIG_REGS(ctxt).xer)
+#define SIG_CCR(info, ctxt) (SIG_REGS(ctxt).ccr)
+
+#define SIG_CODE0(info, ctxt) ((uintptr)(info)->si_code)
+#define SIG_FAULT(info, ctxt) (SIG_REGS(ctxt).dar)
diff --git a/src/pkg/runtime/signal_power64x.c b/src/pkg/runtime/signal_power64x.c
new file mode 100644
index 0000000000..89c5c78485
--- /dev/null
+++ b/src/pkg/runtime/signal_power64x.c
@@ -0,0 +1,137 @@
+// 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.
+
+// +build linux
+// +build power64 power64le
+
+#include "runtime.h"
+#include "defs_GOOS_GOARCH.h"
+#include "os_GOOS.h"
+#include "signal_GOOS_GOARCH.h"
+#include "signals_GOOS.h"
+
+void
+runtime·dumpregs(Siginfo *info, void *ctxt)
+{
+	USED(info); USED(ctxt);
+	runtime·printf("r0  %X\t", SIG_R0(info, ctxt));
+	runtime·printf("r1  %X\n", SIG_R1(info, ctxt));
+	runtime·printf("r2  %X\t", SIG_R2(info, ctxt));
+	runtime·printf("r3  %X\n", SIG_R3(info, ctxt));
+	runtime·printf("r4  %X\t", SIG_R4(info, ctxt));
+	runtime·printf("r5  %X\n", SIG_R5(info, ctxt));
+	runtime·printf("r6  %X\t", SIG_R6(info, ctxt));
+	runtime·printf("r7  %X\n", SIG_R7(info, ctxt));
+	runtime·printf("r8  %X\t", SIG_R8(info, ctxt));
+	runtime·printf("r9  %X\n", SIG_R9(info, ctxt));
+	runtime·printf("r10  %X\t", SIG_R10(info, ctxt));
+	runtime·printf("r11  %X\n", SIG_R11(info, ctxt));
+	runtime·printf("r12  %X\t", SIG_R12(info, ctxt));
+	runtime·printf("r13  %X\n", SIG_R13(info, ctxt));
+	runtime·printf("r14  %X\t", SIG_R14(info, ctxt));
+	runtime·printf("r15  %X\n", SIG_R15(info, ctxt));
+	runtime·printf("r16  %X\t", SIG_R16(info, ctxt));
+	runtime·printf("r17  %X\n", SIG_R17(info, ctxt));
+	runtime·printf("r18  %X\t", SIG_R18(info, ctxt));
+	runtime·printf("r19  %X\n", SIG_R19(info, ctxt));
+	runtime·printf("r20  %X\t", SIG_R20(info, ctxt));
+	runtime·printf("r21  %X\n", SIG_R21(info, ctxt));
+	runtime·printf("r22  %X\t", SIG_R22(info, ctxt));
+	runtime·printf("r23  %X\n", SIG_R23(info, ctxt));
+	runtime·printf("r24  %X\t", SIG_R24(info, ctxt));
+	runtime·printf("r25  %X\n", SIG_R25(info, ctxt));
+	runtime·printf("r26  %X\t", SIG_R26(info, ctxt));
+	runtime·printf("r27  %X\n", SIG_R27(info, ctxt));
+	runtime·printf("r28  %X\t", SIG_R28(info, ctxt));
+	runtime·printf("r29  %X\n", SIG_R29(info, ctxt));
+	runtime·printf("r30  %X\t", SIG_R30(info, ctxt));
+	runtime·printf("r31  %X\n", SIG_R31(info, ctxt));
+	runtime·printf("pc   %X\t", SIG_PC(info, ctxt));
+	runtime·printf("ctr  %X\n", SIG_CTR(info, ctxt));
+	runtime·printf("link %X\t", SIG_LINK(info, ctxt));
+	runtime·printf("xer  %X\n", SIG_XER(info, ctxt));
+	runtime·printf("ccr  %X\t", SIG_CCR(info, ctxt));
+	runtime·printf("trap %X\n", SIG_TRAP(info, ctxt));
+}
+
+void
+runtime·sighandler(int32 sig, Siginfo *info, void *ctxt, G *gp)
+{
+	SigTab *t;
+	bool crash;
+
+	if(sig == SIGPROF) {
+		runtime·sigprof((uint8*)SIG_PC(info, ctxt), (uint8*)SIG_SP(info, ctxt), (uint8*)SIG_LINK(info, ctxt), gp, g->m);
+		return;
+	}
+	t = &runtime·sigtab[sig];
+	if(SIG_CODE0(info, ctxt) != SI_USER && (t->flags & SigPanic)) {
+		// Make it look like a call to the signal func.
+		// Have to pass arguments out of band since
+		// augmenting the stack frame would break
+		// the unwinding code.
+		gp->sig = sig;
+		gp->sigcode0 = SIG_CODE0(info, ctxt);
+		gp->sigcode1 = SIG_FAULT(info, ctxt);
+		gp->sigpc = SIG_PC(info, ctxt);
+
+		// We arrange link, and pc to pretend the panicking
+		// function calls sigpanic directly.
+		// Always save LINK to stack so that panics in leaf
+		// functions are correctly handled. This smashes
+		// the stack frame but we're not going back there
+		// anyway.
+		SIG_SP(info, ctxt) -= sizeof(uintptr);
+		*(uintptr*)SIG_SP(info, ctxt) = SIG_LINK(info, ctxt);
+		// Don't bother saving PC if it's zero, which is
+		// probably a call to a nil func: the old link register
+		// is more useful in the stack trace.
+		if(gp->sigpc != 0)
+			SIG_LINK(info, ctxt) = gp->sigpc;
+		// In case we are panicking from external C code
+		SIG_R0(info, ctxt) = 0;
+		SIG_R30(info, ctxt) = (uintptr)gp;
+		SIG_PC(info, ctxt) = (uintptr)runtime·sigpanic;
+		return;
+	}
+
+	if(SIG_CODE0(info, ctxt) == SI_USER || (t->flags & SigNotify))
+		if(runtime·sigsend(sig))
+			return;
+	if(t->flags & SigKill)
+		runtime·exit(2);
+	if(!(t->flags & SigThrow))
+		return;
+
+	g->m->throwing = 1;
+	g->m->caughtsig = gp;
+	if(runtime·panicking)	// traceback already printed
+		runtime·exit(2);
+	runtime·panicking = 1;
+
+	if(sig < 0 || sig >= NSIG)
+		runtime·printf("Signal %d\n", sig);
+	else
+		runtime·printf("%s\n", runtime·sigtab[sig].name);
+
+	runtime·printf("PC=%x\n", SIG_PC(info, ctxt));
+	if(g->m->lockedg != nil && g->m->ncgo > 0 && gp == g->m->g0) {
+		runtime·printf("signal arrived during cgo execution\n");
+		gp = g->m->lockedg;
+	}
+	runtime·printf("\n");
+
+	if(runtime·gotraceback(&crash)){
+		runtime·goroutineheader(gp);
+		runtime·traceback(SIG_PC(info, ctxt), SIG_SP(info, ctxt), SIG_LINK(info, ctxt), gp);
+		runtime·tracebackothers(gp);
+		runtime·printf("\n");
+		runtime·dumpregs(info, ctxt);
+	}
+	
+	if(crash)
+		runtime·crash();
+
+	runtime·exit(2);
+}
diff --git a/src/pkg/runtime/sys_linux_power64x.s b/src/pkg/runtime/sys_linux_power64x.s
new file mode 100644
index 0000000000..c0c41efa95
--- /dev/null
+++ b/src/pkg/runtime/sys_linux_power64x.s
@@ -0,0 +1,369 @@
+// 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.
+
+// +build linux
+// +build power64 power64le
+
+//
+// System calls and other sys.stuff for Power64, Linux
+//
+
+#include "zasm_GOOS_GOARCH.h"
+#include "../../cmd/ld/textflag.h"
+
+#define SYS_exit		  1
+#define SYS_read		  3
+#define SYS_write		  4
+#define SYS_open		  5
+#define SYS_close		  6
+#define SYS_fcntl		 55
+#define SYS_gettimeofday	 78
+#define SYS_select		 82	// always return -ENOSYS
+#define SYS_mmap		 90
+#define SYS_munmap		 91
+#define SYS_setitimer		104
+#define SYS_clone		120
+#define SYS_newselect		142
+#define SYS_sched_yield		158
+#define SYS_rt_sigreturn	172
+#define SYS_rt_sigaction	173
+#define SYS_rt_sigprocmask	174
+#define SYS_sigaltstack		185
+#define SYS_ugetrlimit		190
+#define SYS_madvise		205
+#define SYS_mincore		206
+#define SYS_gettid		207
+#define SYS_tkill		208
+#define SYS_futex		221
+#define SYS_sched_getaffinity	223
+#define SYS_exit_group		234
+#define SYS_epoll_create	236
+#define SYS_epoll_ctl		237
+#define SYS_epoll_wait		238
+#define SYS_clock_gettime	246
+#define SYS_epoll_create1	315
+
+TEXT runtime·exit(SB),NOSPLIT,$-8-8
+	MOVW	8(R1), R3
+	SYSCALL	$SYS_exit_group
+	RETURN
+
+TEXT runtime·exit1(SB),NOSPLIT,$-8-8
+	MOVW	8(R1), R3
+	SYSCALL	$SYS_exit
+	RETURN
+
+TEXT runtime·open(SB),NOSPLIT,$-8-16
+	MOVD	8(R1), R3
+	MOVW	16(R1), R4
+	MOVW	20(R1), R5
+	SYSCALL	$SYS_open
+	RETURN
+
+TEXT runtime·close(SB),NOSPLIT,$-8-16
+	MOVW	8(R1), R3
+	SYSCALL	$SYS_close
+	RETURN
+
+TEXT runtime·write(SB),NOSPLIT,$-8-24
+	MOVD	8(R1), R3
+	MOVD	16(R1), R4
+	MOVW	24(R1), R5
+	SYSCALL	$SYS_write
+	RETURN
+
+TEXT runtime·read(SB),NOSPLIT,$-8-24
+	MOVW	8(R1), R3
+	MOVD	16(R1), R4
+	MOVW	24(R1), R5
+	SYSCALL	$SYS_read
+	RETURN
+
+TEXT runtime·getrlimit(SB),NOSPLIT,$-8-24
+	MOVW	8(R1), R3
+	MOVD	16(R1), R4
+	SYSCALL	$SYS_ugetrlimit // ??? why not use SYS_getrlimit
+	RETURN
+
+TEXT runtime·usleep(SB),NOSPLIT,$-8-16
+	MOVW	usec+0(FP), R3
+	MOVD	R3, R5
+	MOVW	$1000000, R4
+	DIVD	R4, R3
+	MOVD	R3, 0(R1)
+	MULLD	R3, R4
+	SUB	R4, R5
+	MOVD	R5, 8(R1)
+
+	// select(0, 0, 0, 0, &tv)
+	MOVW	$0, R3
+	MOVW	$0, R4
+	MOVW	$0, R5
+	MOVW	$0, R6
+	MOVD	R1, R7
+	SYSCALL	$SYS_newselect
+	RETURN
+
+TEXT runtime·raise(SB),NOSPLIT,$-8
+	SYSCALL	$SYS_gettid
+	MOVW	R3, R3	// arg 1 tid
+	MOVW	sig+0(FP), R4	// arg 2
+	SYSCALL	$SYS_tkill
+	RETURN
+
+TEXT runtime·setitimer(SB),NOSPLIT,$-8-24
+	MOVW	8(R1), R3
+	MOVD	16(R1), R4
+	MOVD	24(R1), R5
+	SYSCALL	$SYS_setitimer
+	RETURN
+
+TEXT runtime·mincore(SB),NOSPLIT,$-8-24
+	MOVD	8(R1), R3
+	MOVD	16(R1), R4
+	MOVD	24(R1), R5
+	SYSCALL	$SYS_mincore
+	RETURN
+
+// func now() (sec int64, nsec int32)
+TEXT time·now(SB),NOSPLIT,$16
+	MOVD	$0(R1), R3
+	MOVD	$0, R4
+	SYSCALL	$SYS_gettimeofday
+	MOVD	0(R1), R3	// sec
+	MOVW	8(R1), R5	// usec
+	MOVD	$1000, R4
+	MULLD	R4, R5
+	MOVD	R3, sec+0(FP)
+	MOVW	R5, nsec+8(FP)
+	RETURN
+
+TEXT runtime·nanotime(SB),NOSPLIT,$16
+	MOVW	$1, R3 // CLOCK_MONOTONIC
+	MOVD	$0(R1), R4
+	SYSCALL	$SYS_clock_gettime
+	MOVD	0(R1), R3	// sec
+	MOVD	8(R1), R5	// nsec
+	// sec is in R3, nsec in R5
+	// return nsec in R3
+	MOVD	$1000000000, R4
+	MULLD	R4, R3
+	ADD	R5, R3
+	RETURN
+
+TEXT runtime·rtsigprocmask(SB),NOSPLIT,$-8-32
+	MOVW	8(R1), R3
+	MOVD	16(R1), R4
+	MOVD	24(R1), R5
+	MOVW	32(R1), R6
+	SYSCALL	$SYS_rt_sigprocmask
+	BVC	2(PC)
+	MOVD	R0, 0xf1(R0)	// crash
+	RETURN
+
+TEXT runtime·rt_sigaction(SB),NOSPLIT,$-8-32
+	MOVD	8(R1), R3
+	MOVD	16(R1), R4
+	MOVD	24(R1), R5
+	MOVD	32(R1), R6
+	SYSCALL	$SYS_rt_sigaction
+	RETURN
+
+#ifdef GOARCH_power64le
+// power64le doesn't need function descriptors
+TEXT runtime·sigtramp(SB),NOSPLIT,$64
+#else
+// function descriptor for the real sigtramp
+TEXT runtime·sigtramp(SB),NOSPLIT,$-8
+	DWORD	$runtime·_sigtramp(SB)
+	DWORD	$0
+	DWORD	$0
+TEXT runtime·_sigtramp(SB),NOSPLIT,$64
+#endif
+	// initialize essential registers (just in case)
+	BL	runtime·reginit(SB)
+
+	// check that g exists
+	CMP	g, $0
+	BNE	6(PC)
+	MOVD	R3, 8(R1)
+	MOVD	$runtime·badsignal(SB), R31
+	MOVD	R31, CTR
+	BL	(CTR)
+	RETURN
+
+	// save g
+	MOVD	g, 40(R1)
+	MOVD	g, R6
+
+	// g = m->gsignal
+	MOVD	g_m(g), R7
+	MOVD	m_gsignal(R7), g
+
+	MOVW	R3, 8(R1)
+	MOVD	R4, 16(R1)
+	MOVD	R5, 24(R1)
+	MOVD	R6, 32(R1)
+
+	BL	runtime·sighandler(SB)
+
+	// restore g
+	MOVD	40(R1), g
+
+	RETURN
+
+TEXT runtime·mmap(SB),NOSPLIT,$-8
+	MOVD	8(R1), R3
+	MOVD	16(R1), R4
+	MOVW	24(R1), R5
+	MOVW	28(R1), R6
+	MOVW	32(R1), R7
+	MOVW	36(R1), R8
+
+	SYSCALL	$SYS_mmap
+	BVC	2(PC)
+	NEG	R3, R3
+	RETURN
+
+TEXT runtime·munmap(SB),NOSPLIT,$-8
+	MOVD	8(R1), R3
+	MOVD	16(R1), R4
+	SYSCALL	$SYS_munmap
+	BVC	2(PC)
+	MOVD	R0, 0xf3(R0)
+	RETURN
+
+TEXT runtime·madvise(SB),NOSPLIT,$-8
+	MOVD	8(R1), R3
+	MOVD	16(R1), R4
+	MOVD	24(R1), R5
+	SYSCALL	$SYS_madvise
+	// ignore failure - maybe pages are locked
+	RETURN
+
+// int64 futex(int32 *uaddr, int32 op, int32 val,
+//	struct timespec *timeout, int32 *uaddr2, int32 val2);
+TEXT runtime·futex(SB),NOSPLIT,$-8
+	MOVD	8(R1), R3
+	MOVW	16(R1), R4
+	MOVW	20(R1), R5
+	MOVD	24(R1), R6
+	MOVD	32(R1), R7
+	MOVW	40(R1), R8
+	SYSCALL	$SYS_futex
+	RETURN
+
+// int64 clone(int32 flags, void *stack, M *mp, G *gp, void (*fn)(void));
+TEXT runtime·clone(SB),NOSPLIT,$-8
+	MOVW	flags+0(FP), R3
+	MOVD	stack+8(FP), R4
+
+	// Copy mp, gp, fn off parent stack for use by child.
+	// Careful: Linux system call clobbers ???.
+	MOVD	mm+16(FP), R7
+	MOVD	gg+24(FP), R8
+	MOVD	fn+32(FP), R12
+
+	MOVD	R7, -8(R4)
+	MOVD	R8, -16(R4)
+	MOVD	R12, -24(R4)
+	MOVD	$1234, R7
+	MOVD	R7, -32(R4)
+
+	SYSCALL $SYS_clone
+
+	// In parent, return.
+	CMP	R3, $0
+	BEQ	2(PC)
+	RETURN
+
+	// In child, on new stack.
+	// initialize essential registers
+	BL	runtime·reginit(SB)
+	MOVD	-32(R1), R7
+	CMP	R7, $1234
+	BEQ	2(PC)
+	MOVD	R0, 0(R0)
+
+	// Initialize m->procid to Linux tid
+	SYSCALL $SYS_gettid
+
+	MOVD	-24(R1), R12
+	MOVD	-16(R1), R8
+	MOVD	-8(R1), R7
+
+	MOVD	R3, m_procid(R7)
+
+	// TODO: setup TLS.
+
+	// In child, set up new stack
+	MOVD	R7, g_m(R8)
+	MOVD	R8, g
+	//CALL	runtime·stackcheck(SB)
+
+	// Call fn
+	MOVD	R12, CTR
+	BL	(CTR)
+
+	// It shouldn't return.  If it does, exit
+	MOVW	$111, R3
+	SYSCALL $SYS_exit_group
+	BR	-2(PC)	// keep exiting
+
+TEXT runtime·sigaltstack(SB),NOSPLIT,$-8
+	MOVD	new+0(FP), R3
+	MOVD	old+8(FP), R4
+	SYSCALL	$SYS_sigaltstack
+	BVC	2(PC)
+	MOVD	R0, 0xf1(R0)  // crash
+	RETURN
+
+TEXT runtime·osyield(SB),NOSPLIT,$-8
+	SYSCALL	$SYS_sched_yield
+	RETURN
+
+TEXT runtime·sched_getaffinity(SB),NOSPLIT,$-8
+	MOVD	8(R1), R3
+	MOVD	16(R1), R4
+	MOVD	24(R1), R5
+	SYSCALL	$SYS_sched_getaffinity
+	RETURN
+
+// int32 runtime·epollcreate(int32 size);
+TEXT runtime·epollcreate(SB),NOSPLIT,$-8
+	MOVW    8(R1), R3
+	SYSCALL	$SYS_epoll_create
+	RETURN
+
+// int32 runtime·epollcreate1(int32 flags);
+TEXT runtime·epollcreate1(SB),NOSPLIT,$-8
+	MOVW	8(R1), R3
+	SYSCALL	$SYS_epoll_create1
+	RETURN
+
+// int32 runtime·epollctl(int32 epfd, int32 op, int32 fd, EpollEvent *ev);
+TEXT runtime·epollctl(SB),NOSPLIT,$-8
+	MOVW	8(R1), R3
+	MOVW	12(R1), R4
+	MOVW	16(R1), R5
+	MOVD	24(R1), R6
+	SYSCALL	$SYS_epoll_ctl
+	RETURN
+
+// int32 runtime·epollwait(int32 epfd, EpollEvent *ev, int32 nev, int32 timeout);
+TEXT runtime·epollwait(SB),NOSPLIT,$-8
+	MOVW	8(R1), R3
+	MOVD	16(R1), R4
+	MOVW	24(R1), R5
+	MOVW	28(R1), R6
+	SYSCALL	$SYS_epoll_wait
+	RETURN
+
+// void runtime·closeonexec(int32 fd);
+TEXT runtime·closeonexec(SB),NOSPLIT,$-8
+	MOVW    8(R1), R3  // fd
+	MOVD    $2, R4  // F_SETFD
+	MOVD    $1, R5  // FD_CLOEXEC
+	SYSCALL	$SYS_fcntl
+	RETURN
diff --git a/src/pkg/runtime/sys_power64x.c b/src/pkg/runtime/sys_power64x.c
new file mode 100644
index 0000000000..ed8900c45e
--- /dev/null
+++ b/src/pkg/runtime/sys_power64x.c
@@ -0,0 +1,38 @@
+// 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.
+
+// +build power64 power64le
+
+#include "runtime.h"
+
+// adjust Gobuf as if it executed a call to fn with context ctxt
+// and then did an immediate Gosave.
+void
+runtime·gostartcall(Gobuf *gobuf, void (*fn)(void), void *ctxt)
+{
+	if(gobuf->lr != 0)
+		runtime·throw("invalid use of gostartcall");
+	gobuf->lr = gobuf->pc;
+	gobuf->pc = (uintptr)fn;
+	gobuf->ctxt = ctxt;
+}
+
+// Called to rewind context saved during morestack back to beginning of function.
+// To help us, the linker emits a jmp back to the beginning right after the
+// call to morestack. We just have to decode and apply that jump.
+void
+runtime·rewindmorestack(Gobuf *gobuf)
+{
+	uint32 inst;
+
+	inst = *(uint32*)gobuf->pc;
+	if((gobuf->pc&3) == 0 && (inst>>24) == 0x4b && (inst&3) == 0) {
+		runtime·printf("runtime: rewind pc=%p to pc=%p\n", gobuf->pc, gobuf->pc + ((int32)(inst<<8)>>8));
+		gobuf->pc += (int32)(inst<<8)>>8;
+		return;
+	}
+	runtime·printf("runtime: pc=%p %x\n", gobuf->pc, inst);
+	runtime·throw("runtime: misuse of rewindmorestack");
+}
+