commit 63854a157ade1a05332668e26dd148590aecb417
Author: David du Colombier <0intro@gmail.com>
Date:   Fri May 28 18:52:58 2021 +0200

    sparc

diff --git a/sys/src/ape/lib/mp/sparc/mkfile b/sys/src/ape/lib/mp/sparc/mkfile
new file mode 100644
index 000000000..7c6d6ab3b
--- /dev/null
+++ b/sys/src/ape/lib/mp/sparc/mkfile
@@ -0,0 +1,14 @@
+APE=/sys/src/ape
+<$APE/config
+
+LIB=/$objtype/lib/ape/libmp.a
+
+OFILES=	\
+
+HFILES=/$objtype/include/u.h /sys/include/ape/mp.h ../../../../libmp/port/dat.h
+
+UPDATE=\
+	mkfile\
+	$HFILES\
+
+</sys/src/cmd/mksyslib
diff --git a/sys/src/ape/lib/sec/sparc/mkfile b/sys/src/ape/lib/sec/sparc/mkfile
new file mode 100644
index 000000000..f3f68dc38
--- /dev/null
+++ b/sys/src/ape/lib/sec/sparc/mkfile
@@ -0,0 +1,12 @@
+APE=/sys/src/ape
+<$APE/config
+
+LIB=/$objtype/lib/ape/libsec.a
+
+OFILES=	\
+
+HFILES=/sys/include/ape/libsec.h
+
+UPDATE=mkfile
+
+</sys/src/cmd/mksyslib
diff --git a/sys/src/libmp/sparc/mkfile b/sys/src/libmp/sparc/mkfile
new file mode 100644
index 000000000..1691aad50
--- /dev/null
+++ b/sys/src/libmp/sparc/mkfile
@@ -0,0 +1,13 @@
+objtype=sparc
+</$objtype/mkfile
+
+LIB=/$objtype/lib/libmp.a
+OFILES=	\
+
+HFILES=/$objtype/include/u.h /sys/include/mp.h ../port/dat.h
+
+UPDATE=\
+	mkfile\
+	$HFILES\
+
+</sys/src/cmd/mksyslib
diff --git a/sys/src/libsec/sparc/mkfile b/sys/src/libsec/sparc/mkfile
new file mode 100644
index 000000000..21e3193ee
--- /dev/null
+++ b/sys/src/libsec/sparc/mkfile
@@ -0,0 +1,11 @@
+objtype=sparc
+</$objtype/mkfile
+
+LIB=/$objtype/lib/libsec.a
+OFILES=	\
+
+HFILES=/sys/include/libsec.h
+
+UPDATE=mkfile
+
+</sys/src/cmd/mksyslib
diff --git a/sys/src/libthread/sparc.c b/sys/src/libthread/sparc.c
new file mode 100644
index 000000000..8c58f9e4e
--- /dev/null
+++ b/sys/src/libthread/sparc.c
@@ -0,0 +1,27 @@
+#include <u.h>
+#include <libc.h>
+#include <thread.h>
+#include "threadimpl.h"
+
+/* first argument goes in a register; simplest just to ignore it */
+static void
+launchersparc(int, void (*f)(void *arg), void *arg)
+{
+	(*f)(arg);
+	threadexits(nil);
+}
+
+void
+_threadinitstack(Thread *t, void (*f)(void*), void *arg)
+{
+	ulong *tos;
+
+	tos = (ulong*)&t->stk[t->stksize&~7];
+	*--tos = (ulong)arg;
+	*--tos = (ulong)f;
+	*--tos = 0;	/* first arg to launchersparc */
+	*--tos = 0;	/* place to store return PC */
+	t->sched[JMPBUFPC] = (ulong)launchersparc+JMPBUFDPC;
+	t->sched[JMPBUFSP] = (ulong)tos;
+}
+