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From: "cvs-commit at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org> To: gdb-prs@sourceware.org Subject: [Bug breakpoints/27009] [s390] GDB branches randomly for BC instruction while displaced stepping Date: Sun, 06 Dec 2020 10:28:20 +0000 [thread overview] Message-ID: <bug-27009-4717-V2I57eSRWP@http.sourceware.org/bugzilla/> (raw) In-Reply-To: <bug-27009-4717@http.sourceware.org/bugzilla/> https://sourceware.org/bugzilla/show_bug.cgi?id=27009 --- Comment #1 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Joel Brobecker <brobecke@sourceware.org>: https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=296cfb88895e35d8bfc5ce43449e65a92d87354d commit 296cfb88895e35d8bfc5ce43449e65a92d87354d Author: Giancarlo Frix <gfrix@rocketsoftware.com> Date: Sun Dec 6 14:27:52 2020 +0400 s390: Fix BC instruction breakpoint handling This fixes a long-lived bug in the s390 port. When trying to step over a breakpoint set on a BC (branch on condition) instruction with displaced stepping on IBM Z, gdb would incorrectly adjust the pc regardless of whether or not the branch was taken. Since the branch target is an absolute address, this would cause the inferior to jump around wildly whenever the branch was taken, either crashing it or causing it to behave unpredictably. It turns out that the logic to handle BC instructions correctly was in the code, but that the enum value representing its opcode has always been incorrect. This patch corrects the enum value to the actual opcode, fixing the stepping problem. The enum value is also used in the prologue analysis code, so this also fixes a minor bug where more of the prologue would be read than was necessary. gdb/ChangeLog: PR breakpoints/27009 * s390-tdep.h (op_bc): Correct BC opcode value. -- You are receiving this mail because: You are on the CC list for the bug.
next prev parent reply other threads:[~2020-12-06 10:28 UTC|newest] Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-12-03 23:07 [Bug breakpoints/27009] New: " gfrix98 at gmail dot com 2020-12-03 23:09 ` [Bug breakpoints/27009] " gfrix98 at gmail dot com 2020-12-06 10:28 ` cvs-commit at gcc dot gnu.org [this message] 2020-12-06 10:29 ` brobecker at gnat dot com 2020-12-06 10:31 ` cvs-commit at gcc dot gnu.org 2021-01-31 6:26 ` brobecker at gnat dot com 2021-06-27 17:59 ` ahmedsayeed1982 at yahoo dot com 2021-08-10 12:45 ` ucelsanicin at yahoo dot com 2021-09-02 11:06 ` donipah907 at mtlcz dot com 2021-09-02 11:15 ` mark at klomp dot org 2021-09-06 9:09 ` focixujo at livinginsurance dot co.uk 2021-09-10 19:38 ` mehmetgelisin at aol dot com 2021-09-22 10:11 ` diheto5497 at secbuf dot com 2021-09-26 13:31 ` tes.vik1986 at gmail dot com 2021-10-09 11:00 ` gulsenenginar at aol dot com 2021-10-17 19:51 ` vmireskazki at gmail dot com 2021-10-19 7:15 ` progonsaytu at gmail dot com 2021-10-24 10:02 ` glassmtech at ukr dot net 2021-11-06 21:13 ` paneki8601 at dukeoo dot com 2021-11-16 19:08 ` xecana8007 at funboxcn dot com 2021-11-16 19:12 ` xecana8007 at funboxcn dot com 2021-11-16 19:15 ` xecana8007 at funboxcn dot com 2021-11-22 7:39 ` gexed96894 at keagenan dot com
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