sync with FreeBSD (rwlock, gc thread, man pages)

add (broken) mips md stuff
fix some const warnings
add sigaltstack() stub
another hash at getting shlib auto-init to work (mips/elf and i386/a.out)

3 files changed, 75 insertions, 1 deletions

diff --git a/lib/libc_r/arch/i386/uthread_machdep.h b/lib/libc_r/arch/i386/uthread_machdep.h
index 2a296d3ae25..088ff200509 100644
--- a/lib/libc_r/arch/i386/uthread_machdep.h
+++ b/lib/libc_r/arch/i386/uthread_machdep.h
@@ -1,7 +1,7 @@
 /*
  * OpenBSD/i386 machine-dependent thread macros
  *
- * $OpenBSD: uthread_machdep.h,v 1.1 1998/08/28 01:54:58 d Exp $
+ * $OpenBSD: uthread_machdep.h,v 1.2 1998/11/09 03:13:13 d Exp $
  */
 
 /* save the floating point state of a thread */
@@ -29,6 +29,9 @@
 				- 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];
 };
diff --git a/lib/libc_r/arch/mips/_atomic_lock.S b/lib/libc_r/arch/mips/_atomic_lock.S
new file mode 100644
index 00000000000..169852b9c75
--- /dev/null
+++ b/lib/libc_r/arch/mips/_atomic_lock.S
@@ -0,0 +1,35 @@
+/*
+ * $OpenBSD: _atomic_lock.S,v 1.1 1998/11/09 03:13:14 d Exp $
+ */
+
+#include "SYS.h"
+
+/*
+ * Atomicly lock a location with an identifier provided the location
+ * is not currently locked.
+ *
+ * long _atomic_lock(long *a0);
+ * v0 will contain the return value (zero if lock obtained).
+ */
+
+/*
+ * XXXXXX THIS IS LOCK FUNCTION IS TOTALLY BOGUS XXXXXXXXX
+ * pefo@ says that for R4000 processors, there is a way to do this
+ * atomically, but for R3000 you will need to context switch.
+ * Specifically he says the 'll' and 'sc' instructions can be used for mips2.
+ */
+LEAF(_atomic_lock)
+	.set	noreorder
+	.set	nomacro
+
+	/* Get the existing lock value and lock memory: */
+	ori	t0,zero,1
+	lw	v0,0(a0)
+	sw	t0,0(a0)
+	j	ra
+	nop
+
+	.set	macro
+	.set	reorder
+END(_atomic_lock)
+
diff --git a/lib/libc_r/arch/mips/uthread_machdep.h b/lib/libc_r/arch/mips/uthread_machdep.h
new file mode 100644
index 00000000000..605b900f8a7
--- /dev/null
+++ b/lib/libc_r/arch/mips/uthread_machdep.h
@@ -0,0 +1,36 @@
+/*
+ * OpenBSD/mips machine-dependent thread macros
+ *
+ * $OpenBSD: uthread_machdep.h,v 1.1 1998/11/09 03:13:14 d Exp $
+ */
+
+#include <machine/regnum.h>
+#include <machine/signal.h>
+
+/* floating point state is saved by setjmp/longjmp */
+
+#define _thread_machdep_save_float_state(thr) 		/* no need */
+#define _thread_machdep_restore_float_state(thr) 	/* no need */
+
+/* initialise the jmpbuf stack frame so it continues from entry */
+#define _thread_machdep_thread_create(thr, entry, pattr)	\
+	{							\
+	    struct sigcontext *j = &(thr)->saved_jmp_buf;	\
+								\
+	    /* initialise to sane values */			\
+	    _thread_machdep_setjmp(j);				\
+	    /* entry */						\
+	    j->sc_regs[RA] = j->sc_pc; /* for gdb */		\
+	    j->sc_pc = (int)entry;				\
+	    /* stack */						\
+	    j->sc_regs[SP] = (int) (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 {
+	/* nothing needed */
+};