Move atomic_lock code from asm to C with inline asm;

Add m68k, mips and sparc. (needs more careful checking)
Add 'slow_atomic_lock' for crippled archs.

2 files changed, 65 insertions, 0 deletions

diff --git a/lib/libc_r/arch/m68k/_atomic_lock.c b/lib/libc_r/arch/m68k/_atomic_lock.c
new file mode 100644
index 00000000000..be874ad2892
--- /dev/null
+++ b/lib/libc_r/arch/m68k/_atomic_lock.c
@@ -0,0 +1,27 @@
+/*	$OpenBSD: _atomic_lock.c,v 1.1 1998/11/20 11:15:36 d Exp $	*/
+/*
+ * Atomic lock for m68k
+ */
+#include "spinlock.h"
+
+register_t
+_atomic_lock(volatile register_t *lock)
+{
+	register_t old;
+
+	/*
+	 * The Compare And Swap instruction (mc68020 and above)
+	 * compares its first operand with the memory addressed by
+	 * the third. If they are the same value, the second operand
+	 * is stored at the address. Otherwise the 1st operand (register)
+	 * is loaded with the contents of the 3rd operand.
+	 *
+	 *      old = 0;
+	 *	CAS(old, 1, *lock);
+	 *	return old;
+	 */
+	old = 0;
+	__asm__("casl %0, %2, %1" : "=d"(old), "=m"(*lock)
+				  : "d"(1), "0"(old));
+	return old;
+}
diff --git a/lib/libc_r/arch/m68k/uthread_machdep.h b/lib/libc_r/arch/m68k/uthread_machdep.h
new file mode 100644
index 00000000000..3df12262e28
--- /dev/null
+++ b/lib/libc_r/arch/m68k/uthread_machdep.h
@@ -0,0 +1,38 @@
+/*
+ * OpenBSD/m68k machine-dependent thread macros
+ *
+ * $OpenBSD: uthread_machdep.h,v 1.1 1998/11/20 11:15:36 d Exp $
+ */
+
+/* save the floating point state of a thread */
+#define _thread_machdep_save_float_state(thr) 		\
+	{						\
+		/* fsave privileged instr */		\
+	}
+
+/* restore the floating point state of a thread */
+#define _thread_machdep_restore_float_state(thr) 	\
+	{						\
+		/* frestore privileged instr */		\
+	}
+
+/* initialise the jmpbuf stack frame so it continues from entry */
+
+#define _thread_machdep_thread_create(thr, entry, pattr)	\
+	{						\
+	    /* entry */					\
+	    (thr)->saved_jmp_buf[5] = (long) entry;	\
+	    /* stack */					\
+	    (thr)->saved_jmp_buf[2] = (long) (thr)->stack \
+				+ (pattr)->stacksize_attr \
+				- sizeof(double);	\
+	}
+
+#define	_thread_machdep_longjmp(a,v)	_longjmp(a,v)
+#define	_thread_machdep_setjmp(a)	_setjmp(a)
+
+struct _machdep_struct {
+        /* char            saved_fp[108]; */
+	int	dummy;
+};
+