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CTRY:IE; LANG:en; SCL:1; SRV:; IPV:CAL; SFV:NSPM; H:64aa7808-outbound-1.mta.getcheckrecipient.com; PTR:64aa7808-outbound-1.mta.getcheckrecipient.com; CAT:NONE; SFS:(13230040)(36860700013)(376014)(82310400026)(1800799024)(14060799003)(35042699022); DIR:OUT; SFP:1101; X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 28 Jan 2025 10:15:27.8160 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 6e7fb4ee-09e4-447f-0eaa-08dd3f84b00a 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: DU6PEPF00009527.eurprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB8PR08MB5513 X-BeenThere: gdb@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Gdb mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: Luis Machado via Gdb Reply-To: Luis Machado Errors-To: gdb-bounces~public-inbox=simark.ca@sourceware.org Sender: "Gdb" On 1/28/25 09:25, Pavel Labath via Gdb wrote: > On 28/01/2025 09:26, Pavel Labath via Gdb wrote: >> Hello everyone, an lldb dev here :) >> >> I'm sorry for the trouble our implementation of 'x' has caused. I have to admit I was surprised to find that the packet was not in the gdb documentation already. It's been implemented in lldb for as long as I can remember (~10 years), and the new packets we're adding nowadays have much longer names, so I had assumed that it was always a part of the gdb spec. >> >> For what it's worth, I think your definition of the packet makes much more sense. LLDB's definition is indeed ambiguous (and I didn't realize how ambiguous until now) -- it cannot distinguish between a (truncated?) memory read and an error. This behavior is not completely easy to trigger because lldb will by default round the memory reads to 512-byte boundaries (so truncation is unlikely), but with the right commands, I was able to get it to treat valid memory as an error. >> >> For this reason, I am going to propose to migrate lldb to the gdb ("official") definition of the packet. Since we have users which need (fairly long) windows of compatibility with old server, this is going to require method to detect the implementation in use, so I'd like to reuse the same mechanism that's going to be used in gdb (both the zero length probe and the qSupported method seem fine to me). >> >> regards, >> Pavel > > And this is the lldb thread for that. > > pl Hi Pavel, Thanks a lot for the input and for getting a thread going on lldb's side. Hopefully we can get something that works for both and users won't run into hiccups. I suppose we will still need something on gdb's side to handle the existing lldb format, but moving forward we could potentially sync things for both debuggers.