[Lldb-commits] [lldb] [lldb] [ObjectFileELF] Detect QNX Neutrino RTOS targets (PR #97439)

[Ayush Sahay via lldb-commits]

https://github.com/ayushsahay1837 created https://github.com/llvm/llvm-project/pull/97439

This change detects _QNX Neutrino Real-Time Operating System_ targets, and is the second in a series of changes that look to facilitate remote debug of _AArch64_ targets on _QNX_.

_QNX Neutrino Real-Time Operating System_ is a commercial Unix-like real-time operating system primarily targeting the embedded systems market including automotive, medical devices, robotics, transportation, and industrial embedded systems.

The series of changes in question looks to provision support for –

- Launching a debuggee
- Attaching to a debuggee
- Having the debuggee come up stopped at the entry point
- Setting breakpoints
- Stopping at breakpoints
- Reading/writing contents of/to the debuggee's memory
- Reading/writing contents of/to the debuggee's registers
- Reading/writing contents of/to the debuggee's variables
- Resuming the debuggee's execution
- Single-stepping the debuggee's execution
- Interrupting the debuggee's execution
- Dumping information pertaining to the debuggee's stack trace

Kindly note that _ptrace_ isn't available on _QNX_. Instead, _devctl_ can be leveraged to observe and control the execution of a process under debug on _QNX_.

Any additional support (including the facilitation of execution of tests) will be the subject of future work.

>From f28581bb6897395adf4b2202db4a3e772ecacff9 Mon Sep 17 00:00:00 2001
From: Ted Woodward <tedwood at quicinc.com>
Date: Fri, 18 Aug 2023 17:56:00 -0500
Subject: [PATCH] [lldb] [ObjectFileELF] Detect QNX Neutrino RTOS targets

Detect QNX Neutrino Real-Time Operating System targets and duly set the
operating system component of the triple.
---
 lldb/source/Plugins/ObjectFile/ELF/ObjectFileELF.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lldb/source/Plugins/ObjectFile/ELF/ObjectFileELF.cpp b/lldb/source/Plugins/ObjectFile/ELF/ObjectFileELF.cpp
index 5c6b475044be5..c9918cfc0f57e 100644
--- a/lldb/source/Plugins/ObjectFile/ELF/ObjectFileELF.cpp
+++ b/lldb/source/Plugins/ObjectFile/ELF/ObjectFileELF.cpp
@@ -66,6 +66,7 @@ static const char *const LLDB_NT_OWNER_OPENBSD = "OpenBSD";
 static const char *const LLDB_NT_OWNER_ANDROID = "Android";
 static const char *const LLDB_NT_OWNER_CORE = "CORE";
 static const char *const LLDB_NT_OWNER_LINUX = "LINUX";
+static const char *const LLDB_NT_OWNER_QNX = "QNX";
 
 // ELF note type definitions
 static const elf_word LLDB_NT_FREEBSD_ABI_TAG = 0x01;
@@ -1284,6 +1285,8 @@ ObjectFileELF::RefineModuleDetailsFromNote(lldb_private::DataExtractor &data,
           // cases (e.g. compile with -nostdlib) Hence set OS to Linux
           arch_spec.GetTriple().setOS(llvm::Triple::OSType::Linux);
       }
+    } else if (note.n_name == LLDB_NT_OWNER_QNX) {
+      arch_spec.GetTriple().setOS(llvm::Triple::OSType::QNX);
     }
 
     // Calculate the offset of the next note just in case "offset" has been