researchv10no/cmd/spitbol/cint/asmosint.s - view

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CVS tags: researchv10, HEAD

researchv10 Norman

# # Operating System Interface to Berkeley VAX/UNIX # for # Macro SPITBOL V3.5 # ----------------------------------------------- # # Copyright 1982 # Dewar Information Systems Corporation # 221 West Lake Street # Oak Park, Illinois 60302 # # register masks # .set mr0,1 .set mr1,2 .set mr2,4 .set mr3,8 .set mr4,16 .set mr5,32 .set mr6,64 .set mr7,128 .set mr8,256 .set mr9,512 .set mr10,1024 .set mr11,2048 # # c functions assume that r0 -> r5 are scratch. however, spitbol # uses r2, r3, and r5. so, need to save these registers across # function calls. # .set mr235,mr2+mr3+mr5 # # mask for all registers used by compiler. necessary for dealing # with load modules. # .set cmpreg,mr2+mr3+mr5+mr6+mr7+mr8+mr9+mr10 # # miscellaneous equates # .set ch$lk,107 # upper case letter k .set ch$mn,45 # dash (minus sign) .set k,1024 .set kwords,k*4 # # internal spitbol blocks # ----------------------- # # these equates describe compiler control blocks used by osint. # # chain of file control blocks # .set chtyp,0 # type word .set chlen,4 # block length .set chnxt,8 # -> next chblk .set chfcb,12 # -> fcb .set chsize,16 # size of chblk # # icblk - integer block # .set ictyp,0 # type word .set icval,4 # integer value # # scblk - string block # .set sctyp,0 # type word .set sclen,4 # string length .set scstr,8 # start of string # # interface control blocks # ------------------------ # # these control blocks are built by the interface to handle i/o. # for files other than standard input, standard output, and the # terminal, these control blocks reside in the compiler's # dynamic area. this requires appropriate setting of the type # words to allow proper garbage collection. # # blocks with type b$xnt contain non-relocatable addresses - that # is, no word may contain a pointer to another block in the # dynamic area. # # blocks with type b$xrt contain relocatable addresses - that is # words may contain a pointer to another block in the dynamic area. # # the basic structure is: # # for each input or output associated file there is: # # 1 ioblk containing all global information about # the file: filename, buffer block pointer, # file descriptor number, flags # # 1 bfblk containing the file buffer # # 1 or more fcblks containing the access mode (line or # raw), the record length, and a pointer to # the ioblk # # the first INPUT() or OUTPUT() call for a file creates one block # of each type. subsequent calls to INPUT() or OUTPUT() for a # previously associated file, may cause the creation of a new fcblk. # allowing multiple fcblks provides the program with different # ways of accessing the same file. for example, one type of access # can be a character at a time and another entire records. # # the compiler keeps track of all active fcblks, and at times # like end-of-job provides the inteface with a chain of all fcblks. # # # bfblk - i/o buffer control block # .set bftyp,0 # type word - b$xnt .set bflen,4 # block length .set bfsiz,8 # buffer size in bytes .set bfrem,12 # bytes remaining .set bfoff,16 # offset to next remaining byte .set bfsize,20 # end of fixed portion # # fcblk - file control block # .set fctyp,0 # type word - b$xrt .set fclen,4 # block length .set fcrsz,8 # record size ( >0 line mode / <0 raw mode) .set fciob,12 # -> ioblk .set fcsize,16 # size of fcblk # # ioblk - i/o control block # .set iotyp,0 # type word - b$xrt .set iolen,4 # block length .set iofnm,8 # -> filename scblk .set iopid,12 # pid (if one end of pipe) .set iobuf,16 # -> bfblk .set iofdn,20 # file descriptor number .set ioflg,24 # flags .set iosize,28 # size of ioelt # # defines that match "spitio.h" for flags in ioflg # .set IO_INP,1 # input associated .set IO_OUP,2 # output associated .set IO_APP,4 # output open for append .set IO_OPN,8 # file is open .set IO_EOF,16 # eof on input file .set IO_ERR,32 # i/o error .set IO_SYS,64 # this is an osint file .set IO_WRC,128 # don't do buffering .set IO_PIP,256 # this is one end of a pipe .set IO_DED,512 # other end of pipe died .set IO_ILL,1024 # i/o illegal according to sysfc # #----------- # # sysej - end of job # .globl sysej sysej: movl r10,_rzfcb # copy head of fcb chain beqlu 1f # if empty then nothing to close 0: movl chfcb(r10),r1 # -> fcb pushl fciob(r1) # -> ioblk calls $1,_osclose # call to do close movl chnxt(r10),r10 # -> next on chain bnequ 0b # and loop back for more 1: pushl r7 # return &code calls $1,__exit rsb # # sysfc # .globl sysfc sysfc: movl (sp)+,(sp) # remove stacked scblk pushr $mr235 tstl sclen(r10) # if null filearg1 then jeqlu erxit1 # error # # get length of filename and scan off options. # movl r9,-(sp) # -> filename scblk calls $1,_lenfnm # call to get filename length movl r0,lenfname # save length for later use jlss erxit1 # length must not be negative movl r9,-(sp) # -> filename scblk movl $tioblk,-(sp) # -> temporary ioblk movl r7,-(sp) # input/output association flag calls $3,_sioarg # call to scan i/o args tstl r0 # if error in args then jlss erxit1 # take error return # # check for consistency of calls. cannot have both input # and output to same channel. if this happens, though, # set flag and let sysio take proper error exit. # tstl r6 # if no previous fcblk then beqlu 0f # skip movl fciob(r6),r0 # -> ioblk movl ioflg(r0),r0 # get previous flags mcoml $IO_INP+IO_OUP,r1 # get mask for bicl bicl2 r1,r0 # remove all bits but INP&OUP bitl tioblk+ioflg,r0 # if bits are not same then bnequ 0f bisl2 $IO_ILL,tioblk+ioflg # then set error flag 0: # # handle null filenames here - must either have a previous # fcblk or specify -f arg. # tstl lenfname # if non-null filename then bgtr fcfnam # go handle below bitl $IO_OPN,tioblk+ioflg bnequ fcfarf # if -f specified then merge w/non-null tstl r6 # if no previous fcblk then jeqlu erxit1 # error clrl r6 # assume that no new fcblk needed clrl ioblkptr # no ioblk ptr to stuff tstl tioblk # if however i/o args indicate one jeqlu fcxit movl fciob(r6),ioblkptr movl $fcsize,r6 # allocate one jbr fcxit # # handle real filenames and null filenames with -f arg here. # note that they're mutually exclusive. # fcfnam: bitl $IO_OPN,tioblk+ioflg jnequ erxit1 # can't have -f arg too fcfarf: tstl r6 # if previous fcblk passed then jnequ erxit1 # error clrl ioblkptr addl3 $bfsize+3,tioblk+iopid,r6 bicl2 $3,r6 movl r6,bfblksiz addl2 $fcsize+iosize,r6 movl $1,tioblk # set newfcb flag # fcxit: clrl r10 # no private fcblk clrl r8 # xrblk please popr $mr235 addl2 $4,(sp) rsb # # sysil - get input record length # .globl sysil sysil: movl fcrsz(r6),r6 bgtr 0f mnegl r6,r6 0: rsb # # sysin - read input record # .globl sysin sysin: pushr $mr235 pushl fciob(r6) # -> ioblk calls $1,_osopen # call to open file tstl r0 # if open unsuccessful then jnequ erxit3 # take error exit pushl r9 # -> scblk pushl fciob(r6) # -> ioblk pushl fcrsz(r6) # push record length bgtr 0f mnegl (sp),(sp) # if negative then make it positive 0: pushl fcrsz(r6) # i/o mode - raw or line calls $4,_osread # call to do read cmpl r0,$-1 # check for eof or input error jeql erxit1 # take eof exit jlss erxit2 # take error exit movl r0,sclen(r9) # set record length popr $mr235 addl2 $12,(sp) rsb # # sysio # .globl sysio sysio: pushr $mr235 bitl $IO_ILL,tioblk+ioflg jnequ erxit2 # if illegal then take error exit movl r6,fcblkptr # copy fcblk pointer for exit # # fill in fcblk. # tstl tioblk+iotyp # if no new fcb to build then jeqlu iodon # done movl $fcsize,fclen(r6) movl tioblk+iolen,fcrsz(r6) movl ioblkptr,fciob(r6) jnequ iodon movab fcsize(r6),fciob(r6) # # fill in ioblk. # movab fcsize(r6),r6 # -> ioblk movl $b$xrt,(r6) movl $iosize,iolen(r6) movl r9,iofnm(r6) clrl iopid(r6) movab iosize(r6),iobuf(r6) movl tioblk+iofdn,iofdn(r6) movl tioblk+ioflg,ioflg(r6) # # if -f0 or -f1 specified then # # for -f0 ensure that buffer is same as osint's # # for -f1 no buffering should be done # bitl $IO_SYS,ioflg(r6) beqlu 9f cmpl $1,iofdn(r6) blssu 9f beqlu 1f movl $inpbf,iobuf(r6) jbr 9f 1: clrl iobuf(r6) bisl2 $IO_WRC,ioflg(r6) 9: # # fill in bfblk # movab iosize(r6),r6 # -> bfblk movl $b$xnt,(r6) movl bfblksiz,bflen(r6) movl tioblk+iopid,bfsiz(r6) clrl bfrem(r6) clrl bfoff(r6) # iodon: movl fcblkptr,r10 clrl r8 popr $mr235 addl2 $8,(sp) rsb # # syspi - print on interactive channel (terminal) # .globl syspi syspi: movl $ttyiob,r11 jbr piprt # # syspr - print on standard output # .globl syspr syspr: movl $oupiob,r11 # # handle both syspi and syspr here. # piprt: pushr $mr235 bisl2 $IO_WRC,ioflg(r11) # briefly set no buffering pushl r9 # -> scblk pushl r11 # -> ioblk pushl r6 # number characters pushl $1 # line mode calls $4,_oswrite # call to do write bicl2 $IO_WRC,ioflg(r11) # back to buffering tstl r0 # if output error then jneq erxit1 # indicate error return popr $mr235 addl2 $4,(sp) rsb # # sysrd - read from standard input # .globl sysrd sysrd: pushr $mr235 movl $inpiob,ioblkptr # # handle both sysrd and sysri here. # rdmrg: pushl r9 # -> scblk pushl ioblkptr # -> ioblk pushl r8 # read length pushl r8 # line mode calls $4,_osread # call to do read cmpl r0,$-1 # check for eof or input error jeql rdeof # take eof exit jlss erxit1 # take error exit movl r0,sclen(r9) # set read length # # check for 1st record of standard input coming from a file specified # on the command line. if all of these conditions are true, allow # the program to access any arguments following the file name. # tstl rdrec1 # if already ready record 1 then bnequ rdskp # skip cmpl $inpiob,ioblkptr bnequ rdskp # if sysri entry then skip incl rdrec1 # indicate read 1st record from std input tstl _inpptr # if not file from command line then beqlu rdskp # skip cmpb $'#,scstr(r9) # if 1st char not # then bnequ rdskp # skip cmpb $'!,scstr+1(r9) # if 2nd char not ! then bnequ rdskp # skip subl3 _inpcnt,_gblargc,_cmdcnt incl _cmdcnt # compute # args after filename movl $1,_inpcnt # reset input count brb rdmrg # ignore 1st record and try again rdskp: popr $mr235 addl2 $4,(sp) rsb # # come here to handle eof for both sysrd and sysri. if eof # is for sysrd, standard input, switch to next input file # if one exists. # rdeof: movl ioblkptr,r4 # -> ioblk tstl iofdn(r4) # if not file descriptor 0 then jnequ erxit1 # real eof pushl _inpptr # push -> array of pointers pushl _inpcnt # push size of areray calls $2,_swcinp # call to switch input files tstl r0 # if more to read then jeqlu rdmrg # read it jmp erxit1 # else signal eof # # sysri - read from interactive channel (terminal) # .globl sysri sysri: pushr $mr235 movl $ttyiob,ioblkptr jbr rdmrg # # sysst - set file pointer # .globl sysst sysst: pushr $mr235 pushl fciob(r6) # -> ioblk calls $1,_osopen # call to do open tstl r0 # if file open error then jnequ erxit3 # return error # movl fciob(r6),r1 # -> ioblk bitl $IO_PIP,ioflg(r1) jnequ erxit4 # if pipe then set not allowed cmpl iofdn(r1),$2 # if fd < 2 then jlssu erxit4 # set not allowed # cmpl $b$icl,(r7) # if already integer then bnequ 0f movl icval(r7),temp1 # grab value brb 1f 0: cmpl $b$scl,(r7) # else if not a string then jnequ erxit1 # error clrl temp3 # clear scnint character count pushl $temp3 # -> temp3 pushl sclen(r7) # string length pushab scstr(r7) # -> string calls $3,_scnint # call to scan integer movl r0,temp1 # and save 1: # cmpl $b$icl,(r8) # if already integer then bnequ 0f movl icval(r8),temp2 # grab value brb 1f 0: cmpl $b$scl,(r8) # else if not a string then jnequ erxit1 # error clrl temp3 # clear scnint character count pushl $temp3 # -> temp3 pushl sclen(r8) # string length pushab scstr(r8) # -> string calls $3,_scnint # call to scan integer movl r0,temp2 # and save 1: # pushl temp2 # whence pushl temp1 # offset pushl fciob(r6) # -> ioblk calls $3,_doset # call to do set popr $mr235 addl2 $20,(sp) rsb # # systm - get execution time so far # .globl systm systm: pushr $mr2+mr3 movl $tscblk+8,-(sp) # -> times buffer calls $1,_times # call to do times movl tscblk+8,r5 # get user time in 60ths mull2 $100,r5 # mulitply by 100 to get 6000ths divl2 $6,r5 # divide by 6 to get 1000ths popr $mr2+mr3 rsb # # sysxi - exit from executing program # .globl sysxi sysxi: tstl r10 # if 0 instead of scblk then jeqlu xilmod # try to write load module pushr $mr235 cmpl $b$scl,(r10) # if not scblk then jnequ erxit1 # error pushl r10 # push scblk pointer calls $1,_doexec # go do exit jmp erxit2 # should never return # # write load module # xilmod: tstl r5 # if r5 <= 0 then bgtr 0f pushr $mr235 # save regs for error exits jbr erxit1 # and take error exit 0: pushr $cmpreg # else save all compiler regs # # need to save stack contents, so that when load module is # invoked, stack can be recreated. # subl3 sp,_initsp,r0 # compute depth of stack cmpl r0,tscblk # if stack won't fit in tscblk then jgtru xi2big # big trouble movl sp,r0 # -> into real stack movab tscblk+scstr,r1 # -> save stack area 1: movl (r0)+,(r1)+ # copy word of stack ... cmpl r0,_initsp # until hit top word blssu 1b movl r1,lmodstk # set top of saved stack # # before creating the load module, we must relativize the # compiler cells that point into the stack. We do this by # temporarily negating _initsp, calling streloc, and then # restoring _initsp. After the load module has been written, # another call to streloc will restore the stack pointers. # mnegl _initsp,_initsp # negate _initsp so streloc will subtract jsb streloc # relativize the compiler cells mnegl _initsp,_initsp # restore _initsp to its previous value # # create a.out header in hststr scblk. # addl3 $1023,dnamp,r1 # round current memory in use bicl3 $0x3ff,r1,-(sp) # to a multiple of the page size movab hststr+scstr,r0 # -> a.out header block pushl r0 # which will be the other argument movl $0413,(r0)+ # set magic number bicl3 $0x3ff,$_etext,r1 # get text size, rounded down movl r1,(r0)+ # and place it in a.out header subl3 r1,4(sp),(r0)+ # data size = total - text size clrl (r0)+ # we will use no bss clrl (r0)+ clrl (r0)+ # set starting address clrl (r0)+ clrl (r0)+ # # call a workhorse c routine to actually write a.out file. # the amount of memory to write has already been pushed. # calls $2,_wrtaout # call to write a.out # # restore compiler cells to their previous values # jsb streloc # unrelativize stack pointers # tstl r0 # if error creating a.out then blss xi2big # return error # # pop registers and set up call to sysej # popr $cmpreg # restore all registers movl r7,r10 # -> chain of fcbs clrl r7 # set &CODE = 0 jsb sysej # call to end run # # if stack too big # xi2big: popr $cmpreg # restore all regs pushr $mr235 # push correct regs jbr erxit2 # take error exit # # error/ppm exits - pick up n-th word following jsb and return # to address contained in that word. # erxit1: popr $mr235 movl (sp)+,r11 jmp *(r11)+ # erxit2: popr $mr235 addl3 $4,(sp)+,r11 jmp *(r11)+ # erxit3: popr $mr235 addl3 $8,(sp)+,r11 jmp *(r11)+ # erxit4: popr $mr235 addl3 $12,(sp)+,r11 jmp *(r11)+ # erxit5: popr $mr235 addl3 $16,(sp)+,r11 jmp *(r11)+ # erxit6: popr $mr235 addl3 $20,(sp)+,r11 jmp *(r11)+ # # streloc - relocate stack pointers. this routine adds # _initsp to every cell whose address appears in strellst. # streloc: pushr $mr0+mr1 moval _strellst,r1 # start of list of thing to relocate jbr strel1 # jump into the loop strel0: addl2 _initsp,(r0) # relocate a pointer strel1: movl (r1)+,r0 # fetch a pointer to a cell jneq strel0 # if zero, we're done popr $mr0+mr1 rsb # # interface data area # ------------------- # .data 1 # # #! data areas # .globl _cmdcnt _cmdcnt: .long 0 # number of command args rdrec1: .long 0 # read record 1 from std in flag # # standard ioblks # inpiob: .space iobuf .long inpbf # -> input bfblk .long 0 # file descriptor .long IO_INP|IO_OPN|IO_SYS # inpbf: .space bfsiz .long 1024 # buffer size .long 0 # remaining chars to read .long 0 # offset to next character to read .space 1024 # buffer # # oupiob: .space iobuf .long 0 # no buffer .long 1 # file descriptor number .long IO_OUP|IO_OPN|IO_SYS # # ttyiob: .space iobuf .long ttybf # -> tty buffer input .long 2 # file descriptor number .long IO_INP|IO_OUP|IO_OPN|IO_SYS # ttybf: .space bfsiz .long 258 # buffer size .long 0 # remaining chars to read .long 0 # offset to next char to read .space 258 # buffer .align 2 # .globl _rzfcb _rzfcb: .long 0 # fildes: .long 0 pr_len: .long 0 rd_len: .long 0 lenfname: .long 0 ioblkptr: .long 0 bfblkptr: .long 0 bfblksiz: .long 0 fcblkptr: .long 0 tioblk: .space iosize # # flag that indicates that this is a load module. also, serves # the dual purpose of indicating size of saved stack. # lmodstk: .long 0 # temp1: .long 0 temp2: .long 0 temp3: .long 0 # nulstr: .long 0,0 # tscblk: .long 512,0 .space 512 # hststr: .long 128,0 .space 128

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