PSARC 1994/196      PowerPC Header Files
			Report on issue 5 from inception review.

    Bill Taylor @ West

This note describes how the PowerPC Header Files is dependent on the
PowerPC ABI.  Each header file that has such a dependency is listed
below, along with a brief description of that dependency.  Header
files that are mentioned in the PowerPC ABI and are the same on all
platforms (SPARC, x86, and PowerPC) are not mentioned here.

	usr/src/head/alloca.h
		alloca uses a built-in compiler mechanism

	usr/src/head/float.h
		Quad extended floating point used.

	usr/src/head/setjmp.h
		types jmp_buf and sigjmp_buf defined.

	usr/src/head/stdarg.h
	usr/src/head/varargs.h
		PowerPC varargs (see report on issue 4).

	usr/src/head/stdio.h
		_NFILE defined as 3.

	usr/src/uts/common/sys/elf_ppc.h
		ELF relocation definitions for PowerPC

	usr/src/uts/common/sys/isa_defs.h
		The following definitions are for the PowerPC
		(little endian) ABI.

			_LITTLE_ENDIAN
			_STACK_GROWS_DOWNWARD
			_LONG_LONG_LTOH
			_BIT_FIELDS_LTOH
			_IEEE_754
			_CHAR_IS_SIGNED

	ppc/sys/asm_linkage.h
		Various assembly code sequences

	ppc/sys/frame.h
		Stack frame layout

	ppc/sys/machsig.h
		Signal codes

	ppc/sys/procfs.h
		Ioctls for /proc   ????? worth mentioning???

	ppc/sys/psw.h
		MSR bits that are user modifiable

	ppc/sys/reg.h
		Register symbols/names, struct regs, struct fpu,
		"mcontext" structure.

	ppc/sys/trap.h
		trap types

	ppc/sys/ucontext.h
		struct ucontext and UC_* definitions.