// BcplFiles.d -- Bcpl-related file formats
// Copyright Xerox Corporation 1980
// Last modified February 9, 1980  1:13 AM by Boggs


//----------------------------------------------------------------------------
structure BLV:		// Bcpl Layout Vector - passed to program on startup
//----------------------------------------------------------------------------
[
overlayAddress^0, 25 word
startOfStatics word	// address of first static
endOfStatics word	// address of last static
startOfCode word	// address of first word of code
afterLastCodeWord word	// 1 + largest address at which code is loaded
			//  (normally endCode is the same, and the system
			//  treats that value as the end of the program)
endCode word		// first location which may be used for data; 
			//  used by the system to set EndCode
relPairTable word	// /I switch: address in code area for table
]
manifest lBLV = size BLV/16


//----------------------------------------------------------------------------
structure SV:		// Format of an Alto RUN (save) file
//----------------------------------------------------------------------------
[
H:			// This is a mangled BBHeader
   [
   startingAddress word	// Initial value for PC = SV.BLV.startOfCode
   length word		// # full pages up to afterLastCodeWord
   type word		// = 0: resident code has type A overlay format
   nStaticLinks word	// # static links after afterLastCodeWord
   blank^2, 11 word
   ]
BLV @BLV		// Bcpl layout vector
page0^0, 277b word	// The first 16b words are ignored; the rest are 
			//  used to set words 16b to 277b of memory
statics^0, 0 word	// Actually there are (BLV.endOfStatics-
			//  BLV.startOfStatics + 1) words here
code^0, 0 word		// Actually there are (BLV.endCode- 
			//  BLV.startOfCode) words here
end word
]

//----------------------------------------------------------------------------
structure BBHeader:	// header of .BB overlay file or file segment
//----------------------------------------------------------------------------
[
codeLoc word		// PC of first code word, controlled by /P
codeLength word		// # code words in overlay
type word		// 0 for /A, 1 for /B
relPairTable word	// FILE word location of relocation table
fileLength word		// file or segment length, in words
overlayPage word	// (alto page #)-1 of this disk page
blank^6b,17b word	// reserved
]
manifest lBBHeader = size BBHeader/16


//----------------------------------------------------------------------------
structure SYmsHeader:	// header of .SYMS file
//----------------------------------------------------------------------------
[
version word		// version of BLDR that loaded
fileLength word		// in words
namesAddr word		// file word location of name strings
symsAddr word		// location of static symbol descriptions
brFilesAddr word	// location of .BR file descriptions
binFilesAddr word	// location of .RUN and .BB file descrips
blank^6b,17b word	// reserved
]
manifest lSYmsHeader = size SYmsHeader/16