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Mon, 13 Nov 2023 13:10:57 +0000 Message-ID: Date: Mon, 13 Nov 2023 13:10:53 +0000 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 00/24] Fix reading and writing pseudo registers in non-current frames To: Simon Marchi , gdb-patches@sourceware.org References: <20231108051222.1275306-1-simon.marchi@polymtl.ca> <9a693dcc-9213-4300-a4ee-25820bfada78@arm.com> <25f0e95c-32bb-41d1-acd0-69273ab7c88b@polymtl.ca> <4bc57dc1-67ee-45b7-9de5-3cdc85b6518e@polymtl.ca> Content-Language: en-US From: Luis Machado In-Reply-To: <4bc57dc1-67ee-45b7-9de5-3cdc85b6518e@polymtl.ca> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-ClientProxiedBy: DS7PR03CA0044.namprd03.prod.outlook.com (2603:10b6:5:3b5::19) To VI1PR08MB3919.eurprd08.prod.outlook.com (2603:10a6:803:c4::31) MIME-Version: 1.0 X-MS-TrafficTypeDiagnostic: VI1PR08MB3919:EE_|AM0PR08MB5345:EE_|AM3PEPF0000A79A:EE_|AS8PR08MB6424:EE_ X-MS-Office365-Filtering-Correlation-Id: c80801a0-3406-485e-90b6-08dbe449ff48 x-checkrecipientrouted: true NoDisclaimer: true X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam-Untrusted: BCL:0; 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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 13 Nov 2023 13:11:06.9279 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: c80801a0-3406-485e-90b6-08dbe449ff48 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: AM3PEPF0000A79A.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AS8PR08MB6424 X-Spam-Status: No, score=-11.8 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,FORGED_SPF_HELO,GIT_PATCH_0,KAM_DMARC_NONE,RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_NONE,TXREP,T_SCC_BODY_TEXT_LINE,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 List-Id: Simon, On 11/9/23 19:04, Simon Marchi wrote: > On 11/8/23 14:34, Simon Marchi wrote: >> Ah, damn, probably because I switched to byte_vector, which doesn't do >> the zero-initialization we want to do. Here's a new patch (that applies >> on the series directly) that doesn't use byte_vector. >> >> diff --git a/gdb/aarch64-tdep.c b/gdb/aarch64-tdep.c >> index 1815d78dec4..200e740e013 100644 >> --- a/gdb/aarch64-tdep.c >> +++ b/gdb/aarch64-tdep.c >> @@ -3300,7 +3300,7 @@ aarch64_pseudo_write_1 (gdbarch *gdbarch, frame_info_ptr next_frame, >> int regnum_offset, >> gdb::array_view buf) >> { >> - unsigned v_regnum = AARCH64_V0_REGNUM + regnum_offset; >> + unsigned raw_regnum = AARCH64_V0_REGNUM + regnum_offset; >> gdb_static_assert (AARCH64_V0_REGNUM == AARCH64_SVE_Z0_REGNUM); >> >> /* Enough space for a full vector register. >> @@ -3309,11 +3309,11 @@ aarch64_pseudo_write_1 (gdbarch *gdbarch, frame_info_ptr next_frame, >> various 'scalar' pseudo registers to behavior like architectural >> writes, register width bytes are written the remainder are set to >> zero. */ >> - constexpr int raw_reg_size = 16; >> + int raw_reg_size = register_size (gdbarch, raw_regnum); >> gdb_byte raw_buf[raw_reg_size] {}; >> - gdb::array_view raw_view (raw_buf); >> + gdb::array_view raw_view (raw_buf, raw_reg_size); >> copy (buf, raw_view.slice (0, buf.size ())); >> - put_frame_register (next_frame, v_regnum, raw_view); >> + put_frame_register (next_frame, raw_regnum, raw_view); >> } >> >> /* Given REGNUM, a SME pseudo-register number, store the bytes from DATA to the >> >> Simon > > I managed to run a Debian AArch64 image in qemu, with SVE support, so I > was able to reproduce the failures you mentioned. In the end, here's a > version of aarch64_pseudo_write_1 that works for me (written as to > minimize the number of unnecessary changes, since that seems to > introduce unexpected bugs...). > > static void > aarch64_pseudo_write_1 (gdbarch *gdbarch, frame_info_ptr next_frame, > int regnum_offset, > gdb::array_view buf) > { > unsigned raw_regnum = AARCH64_V0_REGNUM + regnum_offset; > > /* Enough space for a full vector register. */ > int raw_reg_size = register_size (gdbarch, raw_regnum); > gdb_byte raw_buf[raw_reg_size]; > gdb_static_assert (AARCH64_V0_REGNUM == AARCH64_SVE_Z0_REGNUM); > > /* Ensure the register buffer is zero, we want gdb writes of the > various 'scalar' pseudo registers to behavior like architectural > writes, register width bytes are written the remainder are set to > zero. */ > memset (raw_buf, 0, register_size (gdbarch, AARCH64_V0_REGNUM)); > > gdb::array_view raw_view (raw_buf, raw_reg_size); > copy (buf, raw_view.slice (0, buf.size ())); > put_frame_register (next_frame, raw_regnum, raw_view); > } > > Simon Sorry for the late reply. I was out a couple days last week. The above seems to make gdb.arch/aarch64-fp.exp happy, but gdb.arch/aarch64-pseudo-unwind.exp is still slightly unhappy: FAIL: gdb.arch/aarch64-pseudo-unwind.exp: caller, after change: p/x $v8.q.u FAIL: gdb.arch/aarch64-pseudo-unwind.exp: caller, after change: p/x $s8.u FAIL: gdb.arch/aarch64-pseudo-unwind.exp: continue to breakpoint: continue to break_here_c FAIL: gdb.arch/aarch64-pseudo-unwind.exp: p/x value This was tested on hardware (AWS's Graviton 3). Let me play with it a bit to understand what's up. I also see a SIGSEGV in the test that shouldn't be there. I'm guessing some sort of raw register corruption, as it leads to pc == 0x0.