The handling of varargs is platform-dependent.  Assar Westerlund
stared at the problem for a while and deduces the following table:

vers / compiler         cc              gcc
----------------------------------------------------------------------
1.3                     a0, offset      __base, __offset
2.0                     _a0, _offset    __base, __offset

The current code should handle both cc and gcc versions, provided
you configure for the correct compiler.

Note that some machines want labels to have leading underscores,
while others (e.g. System V) do not.  Thus, several labels appear
duplicated except for the leading underscore, e.g.

	_qt_cswap:
	qt_cswap:

PowerPC assembly support


1) MacOS X, Darwin, MKLinux and other systems based on Mach kernel ABI:

	- Configuration command: ./config powerpc-darwin

	- See documentation inside powerpc_mach.h, powerpc_mach.s, powerpc.c.


2) LinuxPPC, and other systems based on System V ABI:

	- Configuration command: ./config powerpc

	- See documentation inside powerpc_sys5.h, powerpc_sys5.s, powerpc.c.


Marco Bucci <marco.bucci@inwind.it>
December 2002


 * This software is largely based on the original PowerPC-Linux porting
 * developed by Ken Aaker <kenaaker@silverbacksystems.com>
 *
 * Marco Bucci <marco.bucci@inwind.it>
 * December 2002

Solaris 2.x is like System V (maybe it *is* System V?) and is different
from older versions in that it uses no leading underscore for variable
and function names.  That is, the old convention was:

	foo(){}

got compiled as

		.globl	_foo
	_foo:

and is now compiled as

		.globl	foo
	foo:

The `config' script should fix up the older (leading underscore) versions
of the machine-dependent files to use the newer (no leading underscore)
calling conventions.

Indexes created Thu Sep 26 06:36:22 EDT 2019