2004-01-06 Vangelis Rokas <vrokas@otenet.gr>

2004-01-06 Vangelis Rokas <vrokas@otenet.gr>

	PIC16 port related changes:
	* device.c: removed pic16_finalMapping and pic16_finalMappingSize,
	added variable stackPos,

	* gen.c: genCall, assignResultValue: added support for
	pushing/retrieving function parameters to/from stack,
	genFunction,genEndFunction: setup stack frame for the
	generated function,
	genAddrOf: will be changed according to bug 863624

	* added files genutils.c and genutils.h which contain gen*
	debugged and optimised functions extracted from gen.c

	* glue.c: added variable 'externs' which holds extern symbols,
	pic16emitRegularMap: is modified to properly handle relocatable
	 symbols under the new scheme,
	pic16createInterruptVect: is modified
	pic16printPublics: is modified to emit 'global'	assembler directives,
	added pic16_printExterns to print extern symbols,
	pic16glue: initializes stack/frame pointer in the beginning of
	the assembly output. Temporary hack, will be corrected later,
	because gplink yet does not support stack and SDCC does not
	yet support a type of crt0.o object to create the final binary.

	* Removed many lines that contain 8051 legacy code.
	* The code is finally placed under a 'code' directive.
	* Added port specific options.

	* _process_pragma: simplified since now we do not need *special*
	include file to define SFR registers. But a separate header
	will be needed. This will be developed later.
	* _pic16_parseOptions: added, parses port specific options:
	--pgen-banksel,	--obanksel=, --pomit-config-words, --pomit-ivt,
	--pleave-reset-vector, --penable-stack, --pstack-model, --debug-xtra
	--preplace-udata-with=

	* _pic16_setDefaultOptions: modified to initialize section names,
	but hack is temporarly out of order since it needs improvement.
	* _pic16_genAssemblerPreamble: configuration words are emitted by
	their address instead of their name. This part is incomplete and
	supports only the 18Fxx2 devices. Other devices will emit an error
	during assembly since they do not contain the same set of config
	registers
	* _pic16_genIVT: is modified,

	* pcode.c: added definitions for some hardware registers that are needed
	for stack support
	* added flag is2LitOp and variable pci_magic in pCodeInstruction.
	All PCI entries are updated. Now LFSR is supported.
	* Removed pic16_pciTRIS is mentioned by mdubuc in source
	* added pic16_newpCodeOpLit2 to support instructions with
	two literal arguments
	* pic16_pCode2str: corrected code that emits assembler instructions
	with two literal operands and those that have an access bit modifier
	* genericPrint: now PC_ASMDIR pCodes, can emit a label if it exists,
	this fixes a bug which caused some labels to be lost, when an
	assembler directive was added, i.e. banksel,
	* pic16_FixRegisterBanking: improved logic that causes the insertion
	of bank switching,
	* InlineFunction: functions that are called once, are not any more
	inlined. This can be a port option in the future,

	* pcode.h: added pCodeOpLit2 and added variable label in pCodeAsmDir

	* ralloc.c: added pic16_rel_udata and pic16_fix_udata variables which
	hold the corresponding uninitialized symbols,
	* pic16_allocProcessorRegister: registers have explicit marked the
	accessBank field,
	* pic16_allocInternalRegister: registers are explicit marked as
	not used,
	* pic16_writeUsedRegs: pic16_dynDirectBitRegs was missing from the
	processing list, so bit registers were lost,
	*

	* ralloc.h: added field 'accessBank' and original symbol operand
	in register definition,
	* removed the field isMapped from register definition,

	** Several functions have been removed from various sources:
	BanksUsedFlow2,BanksUsedFlow,FixBankFlow,InstructionRegBank,
	pic16_addMemRange,pic16_isREGinBank,pic16_dump_map,pic16_dump_cblock
	isSFR,validAddress,mapRegister,assignRegister,pic16_assignFixedRegisters
	pic16_assignRelocatableRegisters

	** others have been introduced:
	pic16_areRegsSame,pic16_dump_section,checkAddReg,pic16_groupRegistersInSection
	pic16_popGetLit2,pic16_popCombine2,pushw,pushaop

git-svn-id: https://sdcc.svn.sourceforge.net/svnroot/sdcc/trunk/sdcc@3080 4a8a32a2-be11-0410-ad9d-d568d2c75423