Enough for libc_r on sparc64 to build (this stuff is mostly taken from sparc,

and will need attention before it can be expected to work).

4 files changed, 139 insertions, 0 deletions

diff --git a/lib/libc_r/arch/sparc64/_atomic_lock.c b/lib/libc_r/arch/sparc64/_atomic_lock.c
new file mode 100644
index 00000000000..f14f9f51ba0
--- /dev/null
+++ b/lib/libc_r/arch/sparc64/_atomic_lock.c
@@ -0,0 +1,48 @@
+/*	$OpenBSD: _atomic_lock.c,v 1.1 2001/09/10 20:00:14 jason Exp $	*/
+/*
+ * Atomic lock for sparc
+ */
+ 
+#include "spinlock.h"
+
+int
+_atomic_lock(volatile _spinlock_lock_t * lock)
+{
+	_spinlock_lock_t old;
+
+	/*
+	 *  "  ldstub  [address], reg_rd
+	 * 
+	 *  The atomic load-store instructions copy a byte from memory
+	 *  into r[rd]m then rewrite the addressed byte in memory to all
+	 *  ones [_SPINLOCK_LOCKED]. The operation is performed
+	 *  atomically, that is, without allowing intervening interrupts
+	 *  or deferred traps. In a multiprocessor system, two or more
+	 *  processors executing atomic load-store unsigned byte [...]
+	 *  addressing the same byte [...] simultaneously are guaranteed
+	 *  to execute them in an undefined, but serial order."
+	 *    - p101, The SPARC Architecure Manual (version 8) Prentice-Hall
+	 *
+	 * "LDSTUB loads a byte value from memory to a register and writes
+	 *  the value FF_16 into the addressed byte atomically. LDSTUB
+	 *  is the classic test-and-set instruction. Like SWAP, it has
+	 *  a consensus number of two and so cannot resolve more than
+	 *  two contending processes in a wait-free fashion."
+	 *    - p129, The SPARC Architecture Manual (version 9) Prentice-Hall
+	 *  (See also section J.6 (spinlocks))
+	 *
+	 * (No change to the condition codes are documented.)
+	 */
+	__asm__("ldstub %0,%1"
+		: "=m" (*lock), "=r" (old)
+		: "0" (*lock));
+
+	return (old == _SPINLOCK_LOCKED);
+}
+
+int
+_atomic_is_locked(volatile _spinlock_lock_t * lock)
+{
+	
+	return (*lock == _SPINLOCK_LOCKED);
+}
diff --git a/lib/libc_r/arch/sparc64/uthread_machdep.c b/lib/libc_r/arch/sparc64/uthread_machdep.c
new file mode 100644
index 00000000000..eaea79af8d3
--- /dev/null
+++ b/lib/libc_r/arch/sparc64/uthread_machdep.c
@@ -0,0 +1,45 @@
+/*	$OpenBSD: uthread_machdep.c,v 1.1 2001/09/10 20:00:14 jason Exp $	*/
+
+/*
+ * Machine-dependent thread state functions for OpenBSD/sparc.
+ */
+
+#include <sys/types.h>
+#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 frame64 *f;
+
+	/* Locate the initial frame, aligned at the top of the stack */
+	f = (struct frame64 *)(((int)base + len - sizeof *f) & ~ALIGNBYTES);
+	
+	f->fr_fp = (struct frame64 *)-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/libc_r/arch/sparc64/uthread_machdep.h b/lib/libc_r/arch/sparc64/uthread_machdep.h
new file mode 100644
index 00000000000..6014cf53f03
--- /dev/null
+++ b/lib/libc_r/arch/sparc64/uthread_machdep.h
@@ -0,0 +1,7 @@
+/*	$OpenBSD: uthread_machdep.h,v 1.1 2001/09/10 20:00:14 jason Exp $	*/
+/* David Leonard, <d@csee.uq.edu.au>. Public domain. */
+
+struct _machdep_state {
+	int	fp;		/* frame pointer */
+	int	pc;		/* program counter */
+};
diff --git a/lib/libc_r/arch/sparc64/uthread_machdep_asm.S b/lib/libc_r/arch/sparc64/uthread_machdep_asm.S
new file mode 100644
index 00000000000..aef33143968
--- /dev/null
+++ b/lib/libc_r/arch/sparc64/uthread_machdep_asm.S
@@ -0,0 +1,39 @@
+/*	$OpenBSD: uthread_machdep_asm.S,v 1.1 2001/09/10 20:00:14 jason 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 __sparcv9__
+#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
+