Date: Mon, 4 Jun 2012 16:15:40 +0000 (UTC) From: "George V. Neville-Neil" <gnn@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r236567 - in head/sys/cddl/dev/dtrace: amd64 i386 Message-ID: <201206041615.q54GFeI6051783@svn.freebsd.org>
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Author: gnn Date: Mon Jun 4 16:15:40 2012 New Revision: 236567 URL: http://svn.freebsd.org/changeset/base/236567 Log: Integrate a fix for a very odd signal delivery problem found by Bryan Cantril and others in the Solaris/Illumos version of DTrace. Obtained from: https://www.illumos.org/issues/789 MFC after: 2 weeks Modified: head/sys/cddl/dev/dtrace/amd64/dtrace_subr.c head/sys/cddl/dev/dtrace/i386/dtrace_subr.c Modified: head/sys/cddl/dev/dtrace/amd64/dtrace_subr.c ============================================================================== --- head/sys/cddl/dev/dtrace/amd64/dtrace_subr.c Mon Jun 4 16:04:01 2012 (r236566) +++ head/sys/cddl/dev/dtrace/amd64/dtrace_subr.c Mon Jun 4 16:15:40 2012 (r236567) @@ -27,6 +27,10 @@ * Use is subject to license terms. */ +/* + * Copyright (c) 2011, Joyent, Inc. All rights reserved. + */ + #include <sys/param.h> #include <sys/systm.h> #include <sys/types.h> @@ -297,14 +301,15 @@ dtrace_safe_defer_signal(void) } /* - * If we've executed the original instruction, but haven't performed - * the jmp back to t->t_dtrace_npc or the clean up of any registers - * used to emulate %rip-relative instructions in 64-bit mode, do that - * here and take the signal right away. We detect this condition by - * seeing if the program counter is the range [scrpc + isz, astpc). + * If we have executed the original instruction, but we have performed + * neither the jmp back to t->t_dtrace_npc nor the clean up of any + * registers used to emulate %rip-relative instructions in 64-bit mode, + * we'll save ourselves some effort by doing that here and taking the + * signal right away. We detect this condition by seeing if the program + * counter is the range [scrpc + isz, astpc). */ - if (t->t_dtrace_astpc - rp->r_pc < - t->t_dtrace_astpc - t->t_dtrace_scrpc - isz) { + if (rp->r_pc >= t->t_dtrace_scrpc + isz && + rp->r_pc < t->t_dtrace_astpc) { #ifdef __amd64 /* * If there is a scratch register and we're on the Modified: head/sys/cddl/dev/dtrace/i386/dtrace_subr.c ============================================================================== --- head/sys/cddl/dev/dtrace/i386/dtrace_subr.c Mon Jun 4 16:04:01 2012 (r236566) +++ head/sys/cddl/dev/dtrace/i386/dtrace_subr.c Mon Jun 4 16:15:40 2012 (r236567) @@ -27,6 +27,10 @@ * Use is subject to license terms. */ +/* + * Copyright (c) 2011, Joyent, Inc. All rights reserved. + */ + #include <sys/param.h> #include <sys/systm.h> #include <sys/types.h> @@ -298,14 +302,15 @@ dtrace_safe_defer_signal(void) } /* - * If we've executed the original instruction, but haven't performed - * the jmp back to t->t_dtrace_npc or the clean up of any registers - * used to emulate %rip-relative instructions in 64-bit mode, do that - * here and take the signal right away. We detect this condition by - * seeing if the program counter is the range [scrpc + isz, astpc). + * If we have executed the original instruction, but we have performed + * neither the jmp back to t->t_dtrace_npc nor the clean up of any + * registers used to emulate %rip-relative instructions in 64-bit mode, + * we'll save ourselves some effort by doing that here and taking the + * signal right away. We detect this condition by seeing if the program + * counter is the range [scrpc + isz, astpc). */ - if (t->t_dtrace_astpc - rp->r_pc < - t->t_dtrace_astpc - t->t_dtrace_scrpc - isz) { + if (rp->r_pc >= t->t_dtrace_scrpc + isz && + rp->r_pc < t->t_dtrace_astpc) { #ifdef __amd64 /* * If there is a scratch register and we're on the
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