preparation for switch-based threads

2 files changed, 83 insertions, 0 deletions

diff --git a/lib/libpthread/arch/sparc/uthread_machdep.c b/lib/libpthread/arch/sparc/uthread_machdep.c
new file mode 100644
index 00000000000..789a1d3efd1
--- /dev/null
+++ b/lib/libpthread/arch/sparc/uthread_machdep.c
@@ -0,0 +1,44 @@
+/*	$OpenBSD: uthread_machdep.c,v 1.1 2000/09/25 01:16:40 d Exp $	*/
+
+/*
+ * Machine-dependent thread state functions for OpenBSD/sparc.
+ */
+
+#include <machine/frame.h>
+#include <machine/param.h>
+#include <pthread.h>
+#include "pthread_private.h"
+
+/*
+ * Given a stack and an entry function, initialise a state
+ * structure that can be later switched to.
+ */
+void
+_thread_machdep_init(statep, base, len, entry)
+	struct _machdep_state* statep;
+	void *base;
+	int len;
+	void (*entry)(void);
+{
+	struct frame *f;
+
+	/* Locate the initial frame, aligned at the top of the stack */
+	f = (struct frame *)(((int)base + len - sizeof *f) & ~ALIGNBYTES);
+	
+	f->fr_fp = (struct frame *)-1;		/* purposefully misaligned */
+	f->fr_pc = -1;				/* for gdb */
+	statep->fp = (int)f;
+	statep->pc = -8 + (int)entry;
+}
+
+void
+_thread_machdep_save_float_state(statep)
+	struct _machdep_state* statep;
+{
+}
+
+void
+_thread_machdep_restore_float_state(statep)
+	struct _machdep_state* statep;
+{
+}
diff --git a/lib/libpthread/arch/sparc/uthread_machdep_asm.S b/lib/libpthread/arch/sparc/uthread_machdep_asm.S
new file mode 100644
index 00000000000..27be8c45311
--- /dev/null
+++ b/lib/libpthread/arch/sparc/uthread_machdep_asm.S
@@ -0,0 +1,39 @@
+/*	$OpenBSD: uthread_machdep_asm.S,v 1.1 2000/09/25 01:16:40 d Exp $	*/
+/* David Leonard <d@csee.uq.edu.au>. Public domain. */
+
+#include <machine/asm.h>
+#include <machine/trap.h>
+
+/*
+ * Switch stacks.
+ * On sparc this also means we switch register windows.
+ */
+
+#ifdef __sparc_v9__
+#define flushw		.word 0x81580000
+#else
+#define flushw		t T_FLUSHWIN
+#endif
+
+#define SA(x)	(((x)+15)&(~0x1f))
+#define MINFRAME ((16+1+6)*8)	
+
+/* void _thread_switch(int newstate[2], int savestate[2], int flags); */
+ENTRY(_thread_machdep_switch)
+
+	/* new window */
+	save	%sp, -SA(MINFRAME), %sp
+
+	/* flush all windows (except current one) into memory frames */
+	flushw
+
+	/* switch the stack pointer and return address */
+	st 	%fp, [%i1 + 0]
+	st	%i7, [%i1 + 4]
+	ld	[%i0 + 0], %fp
+	ld	[%i0 + 4], %i7
+
+	/* return to saved window at new %fp */
+	ret
+	restore
+