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(gcc-300.info)Target Macros

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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'.

Driver

Controlling how the driver runs the compilation passes.

Run-time Target

Defining `-m' options like `-m68000' and `-m68020'.

Per-Function Data

Defining data structures for per-function information.

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.

Mode Switching

Insertion of mode-switching instructions.

Misc

Everything else.