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CTRY:IE; LANG:en; SCL:1; SRV:; IPV:CAL; SFV:NSPM; H:64aa7808-outbound-1.mta.getcheckrecipient.com; PTR:ec2-63-35-35-123.eu-west-1.compute.amazonaws.com; CAT:NONE; SFS:(13230040)(1800799024)(35042699022)(36860700013)(376014)(82310400026); DIR:OUT; SFP:1101; X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 17 Jul 2024 15:14:54.1561 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 1d163f43-7018-4599-bd5c-08dca6733642 X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d; Ip=[63.35.35.123]; Helo=[64aa7808-outbound-1.mta.getcheckrecipient.com] X-MS-Exchange-CrossTenant-AuthSource: DU6PEPF00009529.eurprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DBBPR08MB6250 X-Spam-Status: No, score=-11.6 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2, SPF_HELO_NONE, SPF_NONE, TXREP, UNPARSEABLE_RELAY autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: gdb-patches@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Gdb-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: gdb-patches-bounces~public-inbox=simark.ca@sourceware.org On 7/17/24 16:10, Tom de Vries wrote: > On an aarch64-linux system with 32-bit userland running in a chroot, and using > target board unix/mthumb I get: > ... > (gdb) hbreak hbreak.c:27^M > Hardware assisted breakpoint 2 at 0x4004e2: file hbreak.c, line 27.^M That is a bit odd, but it goes through the compat layer, which is not exercised as often as the 32-bit code. Let me see if I can reproduce this one on my end. > (gdb) PASS: gdb.base/hbreak.exp: hbreak > continue^M > Continuing.^M > Unexpected error setting breakpoint: Invalid argument.^M > (gdb) FAIL: gdb.base/hbreak.exp: continue to break-at-exit after hbreak > ... > due to this call in arm_linux_nat_target::low_prepare_to_resume: > ... > if (ptrace (PTRACE_SETHBPREGS, pid, > (PTRACE_TYPE_ARG3) ((i << 1) + 1), &bpts[i].address) < 0) > perror_with_name (_("Unexpected error setting breakpoint")); > ... > > This problem does not happen if instead we use a 4-byte aligned address. > > I'm not sure if this is simply unsupported or if there's a kernel bug of some > sort, but I don't see what gdb can do about this. > > Tentatively mark this as xfail. > > Tested on aarch64-linux. > --- > gdb/testsuite/gdb.base/hbreak.exp | 40 ++++++++++++++++++++++++++----- > 1 file changed, 34 insertions(+), 6 deletions(-) > > diff --git a/gdb/testsuite/gdb.base/hbreak.exp b/gdb/testsuite/gdb.base/hbreak.exp > index 73a3e2afb67..b140257a23e 100644 > --- a/gdb/testsuite/gdb.base/hbreak.exp > +++ b/gdb/testsuite/gdb.base/hbreak.exp > @@ -27,10 +27,38 @@ if ![runto_main] { > > set breakline [gdb_get_line_number "break-at-exit"] > > -gdb_test "hbreak ${srcfile}:${breakline}" \ > - "Hardware assisted breakpoint \[0-9\]+ at 0x\[0-9a-f\]+: file .*${srcfile}, line ${breakline}\\." \ > - "hbreak" > +set re_loc "file \[^\r\n\]*$srcfile, line $breakline" > +set re_dot [string_to_regexp .] > > -gdb_test "continue" \ > - "Continuing\\.\[ \r\n\]+Breakpoint \[0-9\]+, .*break-at-exit.*" \ > - "continue to break-at-exit after hbreak" > +set addr 0x0 > +gdb_test_multiple "hbreak ${srcfile}:${breakline}" "hbreak" { > + -re -wrap "Hardware assisted breakpoint $decimal at ($hex): $re_loc$re_dot" { > + set addr $expect_out(1,string) > + pass $gdb_test_name > + } > +} > + > +set have_xfail 0 > +if { [istarget arm*-*-*] } { > + # When running 32-bit userland on aarch64 kernel, thumb instructions that > + # are not 4-byte aligned may not be supported for setting a hardware > + # breakpoint on. > + set have_xfail [expr ($addr & 0x2) == 2] > +} > + > +set re_xfail \ > + [string_to_regexp \ > + "Unexpected error setting breakpoint: Invalid argument."] > + > +gdb_test_multiple "continue" "continue to break-at-exit after hbreak" { > + -re -wrap "Continuing\\.\[ \r\n\]+Breakpoint \[0-9\]+, .*break-at-exit.*" { > + pass $gdb_test_name > + } > + -re -wrap $re_xfail { > + if { $have_xfail } { > + xfail $gdb_test_name > + } else { > + fail $gdb_test_name > + } > + } > +} > > base-commit: 0ed152c5c6b3c72fc505b331ed77e08b438d643a