svn commit: r356854 - stable/12/sys/cddl/dev/dtrace/arm

[Ian Lepore]

Author: ian
Date: Fri Jan 17 22:24:56 2020
New Revision: 356854
URL: https://svnweb.freebsd.org/changeset/base/356854

Log:
  MFC r356574:
  
  Remove scary-looking printf output that happens when you kldload dtrace on
  arm.  Replace it with a comment block explaining why the function is empty
  on 32-bit arm.

Modified:
  stable/12/sys/cddl/dev/dtrace/arm/dtrace_subr.c
Directory Properties:
  stable/12/   (props changed)

Modified: stable/12/sys/cddl/dev/dtrace/arm/dtrace_subr.c
==============================================================================
--- stable/12/sys/cddl/dev/dtrace/arm/dtrace_subr.c	Fri Jan 17 22:21:38 2020	(r356853)
+++ stable/12/sys/cddl/dev/dtrace/arm/dtrace_subr.c	Fri Jan 17 22:24:56 2020	(r356854)
@@ -123,7 +123,18 @@ dtrace_invop_remove(int (*func)(uintptr_t, struct trap
 void
 dtrace_toxic_ranges(void (*func)(uintptr_t base, uintptr_t limit))
 {
-	printf("IMPLEMENT ME: dtrace_toxic_ranges\n");
+
+	/*
+	 * There are no ranges to exclude that are common to all 32-bit arm
+	 * platforms.  This function only needs to exclude ranges "... in
+	 * which it is impossible to recover from such a load after it has been
+	 * attempted." -- i.e., accessing within the range causes some sort
+	 * fault in the system which is not handled by the normal arm
+	 * exception-handling mechanisms.  If systems exist where that is the
+	 * case, a method to handle this functionality would have to be added to
+	 * the platform_if interface so that those systems could provide their
+	 * specific toxic range(s).
+	 */
 }
 
 void