Date: Thu, 5 Mar 2015 07:40:42 +0000 (UTC) From: Robert Watson <rwatson@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r279626 - head/sys/cddl/dev/fbt/arm Message-ID: <201503050740.t257eg2E087205@svn.freebsd.org>
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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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