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Unformatted text preview: can also produce Thumb code. Figure 2.4 The structure of the ARM cross-development toolkit. ARM development tools 45 The ARM assembler The ARM assembler is a full macro assembler which produces ARM object format output that can be linked with output from the C compiler. Assembly source language is near machine-level, with most assembly instructions translating into single ARM (or Thumb) instructions. ARM assembly language programming is introduced in the next chapter, and the full details of the ARM instruction set, including assembly language formats, are given in Chapter 5. The Thumb instruction set and assembly language formats are given in Chapter 7. The linker takes one or more object files and combines them into an executable program. It resolves symbolic references between the object files and extracts object modules from libraries as needed by the program. It can assemble the various components of the program in a number of different ways, depending on whether the code is to run in RAM (Random Access Memory, which can be read and written) or ROM (Read Only Memory), whether overlays are required, and so on. Normally the linker includes debug tables in the output file. If the object files were compiled with full debug information, this will include full symbolic debug tables (so the program can be debugged using the variable names in the source program). The linker can also produce object library modules that are not executable but are ready for efficient linking with object files in the future. The ARM symbolic debugger is a front-end interface to assist in debugging programs running either under emulation (on the ARMulator) or remotely on a target system such as the ARM development board. The remote system must support the appropriate remote debug protocols either via a serial line or through a JTAG test interface (see Section 8.6 on page 226). Debugging a system where the processor core is embedded within an application-specific system chip is a complex issue that we...
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- Spring '09