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<strong>Tornado</strong> 2.0 User’s Guide Table 5-5 WindSh Commands for System Modification and Debugging (Continued) Call sysResume( ) agentModeShow( ) sysStatusShow( ) quit() or exit( ) Description If supported by the target agent (and if system mode is in effect), return to task mode from system mode. Show the agent mode (system or task). Show the system context status (suspended or running). Dismiss the shell. One of the most useful shell features for interactive development is the dynamic linker. With the shell command ld( ), you can download and link new portions of the application. Because the linking is dynamic, you only have to rebuild the particular piece you are working on, not the entire application. Download can be cancelled with CTRL+C or by clicking Cancel in the load progress indicator window. The dynamic linker is discussed further in VxWorks Programmer’s Guide: Configuration and Build. The m( ) command provides an interactive way of manipulating target memory. The remaining commands in this group are for breakpoints and single-stepping. You can set a breakpoint at any instruction. When that instruction is executed by an eligible task (as specified with the b( ) command), the task that was executing on the target suspends, and a message appears at the shell. At this point, you can examine the task’s registers, do a task trace, and so on. The task can then be deleted, continued, or single-stepped. If a routine called from the shell encounters a breakpoint, it suspends just as any other routine would, but in order to allow you to regain control of the shell, such suspended routines are treated in the shell as though they had returned 0. The suspended routine is nevertheless available for your inspection. When you use s( )to single-step a task, the task executes one machine instruction, then suspends again. The shell display shows all the task registers and the next instruction to be executed by the task. You can use the bh( ) command to set hardware breakpoints at any instruction or data element. Instruction hardware breakpoints can be useful to debug code running in ROM or Flash EPROM. Data hardware breakpoints (watchpoints) are useful if you want to stop when your program accesses a specific address. Hardware breakpoints are available on Intel x86, Intel I960(CX/JX/HX), MIPS R4650, and some PPC processors (PPC860, PPC603, PPC604, PPC403). The arguments of the bh( ) command are architecture specific. For more information, 164
5 Shell run the help( ) command. The number of hardware breakpoints you can set is limited by the hardware; if you exceed the maximum number, you will receive an error. C++ Development Certain WindSh commands are intended specifically for work with C++ applications. Table 5-6 summarizes these commands. For more discussion of these shell commands, see VxWorks Programmer’s Guide: C++ Development. 5 Table 5-6 WindSh Commands for C++ Development Call cplusCtors( ) cplusDtors( ) cplusStratShow() cplusXtorSet( ) Description Call static constructors manually. Call static destructors manually. Report on whether current constructor/destructor strategy is manual or automatic. Set constructor/destructor strategy. In addition, you can use the Tcl routine shConfig to set the environment variable LD_CALL_XTORS within a particular shell. This allows you to use a different C++ strategy in a shell than is used on the target. For more information on shConfig, see WindSh Environment Variables, p.155. Object Display Table 5-7 summarizes the WindSh commands that display VxWorks objects. The browser provides displays that are analogous to the output of many of these routines, except that browser windows can update their contents periodically; see 6. Browser. Table 5-7 WindSh Commands for Object Display Call show( ) browse( ) Description Print information on a specified object in the shell window. Display a specified object in the <strong>Tornado</strong> browser. 165
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7 Debugger Tcl Menu The Tcl menu pr
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7 Debugger The debugger uses the sa
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7 Debugger (gdb) tclproc mld mload
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7 Debugger gdbEvalScalar exprlist E
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7 Debugger 7.7 Tcl: CrossWind Custo
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7 Debugger Most of the examples in
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8 Customization 8.1 Introduction To
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9 Customer Service 9.1 Introduction
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Appendices 303
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C Tornado Tools Reference EXAMPLE R
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C Tornado Tools Reference RETURNS S
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C Tornado Tools Reference DESCRIPTI
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D Utilities Reference aoutToBin - e
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E X Resources E.1 Predefined X Reso
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Index Symbols ? (C/Tcl interpreter
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Index assembler options, specifying
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Index download options 260 download
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Index creating 100 linking 103 open
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Index info command (CrossWind) 258
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Index O Object Modules folder 102 O
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Index redirecting I/O 186-190 shCon
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Index unreserved 82 virtual console
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Index creating 77 virtual I/O 12 VM
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