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with DThread::Suspend(), then replace the instruction removed by the breakpoint and notify the host debugger via the user-side agent.
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14.5 Stop-mode debug API
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The vast majority of hardware platforms supported by Symbian OS are ICE-enabled. Kernel developers and those porting the operating system to new hardware often have access to development boards exposing the JTAG interface, and allowing the use of CPU-level debuggers. The main problem with OS support in a stop-mode debugger is that there is little or no opportunity for the operating system to run code on behalf of the debugger to enable it to perform the tasks it needs. There is no debug agent, and no high-level wire protocol between host and target; communication is through remote memory reads and writes initiated over JTAG. While the CPU is halted, the debugger must do all the data discovery and object manipulation for itself by rummaging around inside the kernel the OS awareness is pushed onto the host. However, Symbian OS publishes an API to make this a little easier. It is a table-driven interface onto the data and kernel objects: a virtual map of the kernel. We implement the map as a memory structure that can be easily navigated with memory reads initiated over the JTAG interface. Thread and process awareness is common in the run-mode debuggers used for application development, but far less common in JTAG stopmode debuggers. Using the API provided, it is possible to integrate the following features into a stop-mode debugger: Thread and process awareness Thread-speci c breakpoints Memory management awareness Code segment management. The EKA2 stop-mode debug API is similar in principle to the API provided in EKA1. However, EKA2 has one signi cant design change. We made this change with the intention of improving performance and reducing interference in timing characteristics of the target when a debugger is attached. The EKA1 solution copied key information from the kernel into a debug log for convenient access by the debugger. EKA2 does not copy information instead, the debugger must locate the information in-place. This design improves the performance of Symbian OS while the debugger
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Kernel Stop-mode Debugger Extension DebuggerInfo Host Debugger Kernel Object Containers JTAG Code Segment List Scheduler Thread Context Table Kernel Object Layout Table Change Flags Kernel
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Figure 14.8 Stop-mode debugger interface
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is attached, at the cost of a slightly more complex client interface (see Figure 14.8). The stop-mode debugger API is built on top of the kernel s core debug APIs. It is implemented as a kernel extension (KDEBUG.DLL), which is enabled simply by including it in a ROM. For most variants, you can do this simply by de ning the STOP_MODE_DEBUGGING macro. Alternatively, you can add the following line to <variant>rom\kernel.iby:
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extension[VARID]= \Epoc32\Release\<assp>\urel\KDEBUG.DLL \System\Bin\kdebug.dll
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The DDebuggerInfo interface implemented by the KDEBUG extension is the debugger s gateway into the kernel. The host initially locates the gateway from a pointer stored at a constant address in the superpage:
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DDebuggerInfo* TSuperPage::iDebuggerInfo
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(The superpage is used for communication between the bootstrap and the kernel, and is described in Section 16.2.2.1.) The gateway contains: The object layout table, which provides a virtual map of the kernel s data types, to allow them to be navigated. The table also isolates the debugger from minor changes in layout of kernel objects
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Pointers to the kernel s object containers for threads, processes, libraries, memory chunks, semaphores, and so on Access to the scheduler for information about the current thread, and current address space Access to the kernel s locks that indicate the validity and state of various kernel objects A mechanism for retrieving the context of any non-current thread. The KDEBUG extension installs an event handler, which it uses to update change ags . These ags can be read by the host debugger to determine if any new kernel objects have been removed (for example, thread death) or created (for example, library loaded). The extension has a minimal impact on performance when installed. Furthermore, there is no overhead on the phone software since the interface can be entirely removed on phones that don t expose JTAG hardware, without re-compiling the kernel. The implementation can be found here:
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