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ref: 77b464a5d5648bb646467111b8faf719cd5c46b6
parent: 162013b02e76608b9d5cd7f1d2db280e970c27ad
author: Jacob Moody <moody@posixcafe.org>
date: Tue Mar 19 21:11:03 EDT 2024 

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;
+}