Initial source

1 files changed, 192 insertions, 0 deletions

diff --git a/kern/xpr.c b/kern/xpr.c
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+++ b/kern/xpr.c
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+/* 
+ * Mach Operating System
+ * Copyright (c) 1991,1990,1989,1988,1987 Carnegie Mellon University
+ * All Rights Reserved.
+ * 
+ * Permission to use, copy, modify and distribute this software and its
+ * documentation is hereby granted, provided that both the copyright
+ * notice and this permission notice appear in all copies of the
+ * software, derivative works or modified versions, and any portions
+ * thereof, and that both notices appear in supporting documentation.
+ * 
+ * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
+ * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
+ * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ * 
+ * Carnegie Mellon requests users of this software to return to
+ * 
+ *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
+ *  School of Computer Science
+ *  Carnegie Mellon University
+ *  Pittsburgh PA 15213-3890
+ * 
+ * any improvements or extensions that they make and grant Carnegie Mellon
+ * the rights to redistribute these changes.
+ */
+
+#include <mach_kdb.h>
+/*
+ * xpr silent tracing circular buffer.
+ */
+#include <kern/xpr.h>
+#include <kern/lock.h>
+#include "cpu_number.h"
+#include <machine/machspl.h>
+#include <vm/vm_kern.h>
+
+
+/*
+ *	After a spontaneous reboot, it is desirable to look
+ *	at the old xpr buffer.  Assuming xprbootstrap allocates
+ *	the buffer in the same place in physical memory and
+ *	the reboot doesn't clear memory, this should work.
+ *	xprptr will be reset, but the saved value should be OK.
+ *	Just set xprenable false so the buffer isn't overwritten.
+ */
+
+decl_simple_lock_data(,	xprlock)
+
+boolean_t xprenable = TRUE;	/* Enable xpr tracing */
+int nxprbufs = 0;	/* Number of contiguous xprbufs allocated */
+int xprflags = 0;	/* Bit mask of xpr flags enabled */
+struct xprbuf *xprbase;	/* Pointer to circular buffer nxprbufs*sizeof(xprbuf)*/
+struct xprbuf *xprptr;	/* Currently allocated xprbuf */
+struct xprbuf *xprlast;	/* Pointer to end of circular buffer */
+
+/*VARARGS1*/
+void xpr(msg, arg1, arg2, arg3, arg4, arg5)
+char *msg;
+int arg1, arg2, arg3, arg4, arg5;
+{
+	register spl_t s;
+	register struct xprbuf *x;
+
+	/* If we aren't initialized, ignore trace request */
+	if (!xprenable || (xprptr == 0))
+		return;
+	/* Guard against all interrupts and allocate next buffer. */
+	s = splhigh();
+	simple_lock(&xprlock);
+	x = xprptr++;
+	if (xprptr >= xprlast) {
+		/* wrap around */
+		xprptr = xprbase;
+	}
+	/* Save xprptr in allocated memory. */
+	*(struct xprbuf **)xprlast = xprptr;
+	simple_unlock(&xprlock);
+	splx(s);
+	x->msg = msg;
+	x->arg1 = arg1;
+	x->arg2 = arg2;
+	x->arg3 = arg3;
+	x->arg4 = arg4;
+	x->arg5 = arg5;
+	x->timestamp = XPR_TIMESTAMP;
+	x->cpuinfo = cpu_number();
+}
+
+void xprbootstrap()
+{
+	vm_offset_t addr;
+	vm_size_t size;
+	kern_return_t kr;
+
+	simple_lock_init(&xprlock);
+	if (nxprbufs == 0)
+		return;	/* assume XPR support not desired */
+
+	/* leave room at the end for a saved copy of xprptr */
+	size = nxprbufs * sizeof(struct xprbuf) + sizeof xprptr;
+
+	kr = kmem_alloc_wired(kernel_map, &addr, size);
+	if (kr != KERN_SUCCESS)
+		panic("xprbootstrap");
+
+	if (xprenable) {
+		/*
+		 *	If xprenable is set (the default) then we zero
+		 *	the buffer so xpr_dump doesn't encounter bad pointers.
+		 *	If xprenable isn't set, then we preserve
+		 *	the original contents of the buffer.  This is useful
+		 *	if memory survives reboots, so xpr_dump can show
+		 *	the previous buffer contents.
+		 */
+
+		bzero((char *) addr, size);
+	}
+
+	xprbase = (struct xprbuf *) addr;
+	xprlast = &xprbase[nxprbufs];
+	xprptr = xprbase;	/* setting xprptr enables tracing */
+}
+
+int		xprinitial = 0;
+
+void xprinit()
+{
+	xprflags |= xprinitial;
+}
+
+#if	MACH_KDB
+#include <machine/setjmp.h>
+
+
+extern void db_printf();
+extern jmp_buf_t *db_recover;
+
+/*
+ *	Print current content of xpr buffers (KDB's sake)
+ *	Use stack order to make it understandable.
+ *
+ *	Called as "!xpr_dump" this dumps the kernel's xpr buffer.
+ *	Called with arguments, it can dump xpr buffers in user tasks,
+ *	assuming they use the same format as the kernel.
+ */
+void xpr_dump(base, nbufs)
+	struct xprbuf *base;
+	int nbufs;
+{
+	jmp_buf_t db_jmpbuf;
+	jmp_buf_t *prev;
+	struct xprbuf *last, *ptr;
+	register struct xprbuf *x;
+	int i;
+	spl_t s;
+
+	if (base == 0) {
+		base = xprbase;
+		nbufs = nxprbufs;
+	}
+
+	if (nbufs == 0)
+		return;
+
+	if (base == xprbase) {
+		s = splhigh();
+		simple_lock(&xprlock);
+	}
+
+	last = base + nbufs;
+	ptr = * (struct xprbuf **) last;
+
+	prev = db_recover;
+	if (_setjmp(db_recover = &db_jmpbuf) == 0)
+	    for (x = ptr, i = 0; i < nbufs; i++) {
+		if (--x < base)
+			x = last - 1;
+
+		if (x->msg == 0)
+			break;
+
+		db_printf("<%d:%x:%x> ", x - base, x->cpuinfo, x->timestamp);
+		db_printf(x->msg, x->arg1,x->arg2,x->arg3,x->arg4,x->arg5);
+	    }
+	db_recover = prev;
+
+	if (base == xprbase) {
+		simple_unlock(&xprlock);
+		(void) splx(s);
+	}
+}
+#endif	MACH_KDB