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 Target Description Macros
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    In addition to the file `MACHINE.md', a machine description includes
 a C header file conventionally given the name `MACHINE.h'.  This header
 file defines numerous macros that convey the information about the
 target machine that does not fit into the scheme of the `.md' file.
 The file `tm.h' should be a link to `MACHINE.h'.  The header file
 `config.h' includes `tm.h' and most compiler source files include
 `config.h'.
 

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* Driver              Controlling how the driver runs the compilation passes.
* Run-time Target     Defining `-m' options like `-m68000' and `-m68020'.
* Storage Layout      Defining sizes and alignments of data.
* Type Layout         Defining sizes and properties of basic user data types.
* Registers           Naming and describing the hardware registers.
* Register Classes    Defining the classes of hardware registers.
* Stack and Calling   Defining which way the stack grows and by how much.
* Varargs             Defining the varargs macros.
* Trampolines         Code set up at run time to enter a nested function.
* Library Calls       Controlling how library routines are implicitly called.
* Addressing Modes    Defining addressing modes valid for memory operands.
* Condition Code      Defining how insns update the condition code.
* Costs               Defining relative costs of different operations.
* Sections            Dividing storage into text, data, and other sections.
* PIC                 Macros for position independent code.
* Assembler Format    Defining how to write insns and pseudo-ops to output.
* Debugging Info      Defining the format of debugging output.
* Cross-compilation   Handling floating point for cross-compilers.
* Misc                Everything else.
 

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