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posix-ppc64le support

Tested on power9 Talos II running Debian

diff: cannot open b/posix-ppc64le//null: file does not exist: 'b/posix-ppc64le//null'

--- /dev/null

+++ b/posix-ppc64le/Makefile

@@ -1,0 +1,25 @@

+ROOT=..

+include ../Make.config

+LIB=../libmachdep.a

+

+CFLAGS+= -Wa,-mregnames

+

+OFILES=\

+	getcallerpc.$O\

+	tas.$O

+

+default: $(LIB)

+$(LIB): $(OFILES)

+	$(AR) r $(LIB) $(OFILES)

+	$(RANLIB) $(LIB)

+

+%.$O: %.c

+	$(CC) $(CFLAGS) $*.c

+

+%.$O: %.s

+	$(AS) -o $*.$O $*.s

+

+%.s: %.spp

+	cpp $*.spp >$*.s

+

+

--- /dev/null

+++ b/posix-ppc64le/getcallerpc.c

@@ -1,0 +1,8 @@

+#include "u.h"

+#include "libc.h"

+

+uintptr

+getcallerpc(void *a)

+{

+	return ((uintptr*)a)[-1];

+}

--- /dev/null

+++ b/posix-ppc64le/tas.c

@@ -1,0 +1,37 @@

+#include "u.h"

+#include "libc.h"

+

+/*

+ * first argument (l) is in r3 at entry.

+ * r3 contains return value upon return.

+ */

+int

+tas(int *x)

+{

+	int     v;

+

+	__asm__("\n	sync\n"

+	"	li	r0,0\n"

+	"	mr	r4,%1		/* &l->val */\n"

+	"	lis	r5,0xdead	/* assemble constant 0xdeaddead */\n"

+	"	ori	r5,r5,0xdead	/* \" */\n"

+	"tas1:\n"

+	"	lwarx	%0,r4,r0	/* v = l->val with reservation */\n"

+	"	cmp	cr0,0,%0,r0	/* v == 0 */\n"

+	"	bne	tas0\n"

+	"	stwcx.	r5,r4,r0   /* if (l->val same) l->val = 0xdeaddead */\n"

+	"	bne	tas1\n"

+	"tas0:\n"

+	"	sync\n"

+	"	isync\n"

+	: "=r" (v)

+	: "r"  (x)

+	: "cc", "memory", "r0", "r4", "r5"

+	);

+	switch(v) {

+	case 0:		return 0;

+	case 0xdeaddead: return 1;

+	default:	print("tas: corrupted 0x%lux\n", v);

+	}

+	return 0;

+}