Author: rwatson
Date: Thu Mar 5 07:40:41 2015
New Revision: 279626
URL: https://svnweb.freebsd.org/changeset/base/279626
Log:
Don't all DTrace's FBT on ARM to instrument undefinedinstruction(), as
this would lead to DTrace reentrance.
Sponsored by: DARPA, AFRL
Modified:
head/sys/cddl/dev/fbt/arm/fbt_isa.c
Modified: head/sys/cddl/dev/fbt/arm/fbt_isa.c
==============================================================================
--- head/sys/cddl/dev/fbt/arm/fbt_isa.c Thu Mar 5 07:30:48 2015
(r279625)
+++ head/sys/cddl/dev/fbt/arm/fbt_isa.c Thu Mar 5 07:40:41 2015
(r279626)
@@ -105,6 +105,13 @@ fbt_provide_module_function(linker_file_
if (name[0] == '_' && name[1] == '_')
return (0);
+ /*
+ * Architecture-specific exclusion list, largely to do with FBT trap
+ * processing, to prevent reentrance.
+ */
+ if (strcmp(name, "undefinedinstruction") == 0)
+ return (0);
+
instr = (uint32_t *)symval->value;
limit = (uint32_t *)(symval->value + symval->size);
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