; BcplRuntime.asm -- replacement for standard Bcpl runtime, ; making calls on microcoded routines ; Copyright Xerox Corporation 1979 ; Last modified October 13, 1977 11:23 AM .ent InitBcplRuntime .bext OsFinish .bext lvUserFinishProc .srel InitBcplRuntime: .InitBcplRuntime Z300: .Z300 .nrel ; Trap opcodes that call the microcoded routines .dusr uGetFrame = 61400 .dusr uReturn = 62000 .dmr uCall = 62400 ; Page zero image, starting at 300 .Z300: uCall 06 ; Lq0.6 Routines that live in page 0 uCall 16 ; Lq1.6 uCall 05 ; Lq0.5 uCall 15 ; Lq1.5 uCall 04 ; Lq0.4 uCall 14 ; Lq1.4 uCall 03 ; Lq0.3 uCall 13 ; Lq1.3 .Z310: uCall 02 ; Lq0.2 uCall 12 ; Lq1.2 uCall 01 ; Lq0.1 uCall 11 ; Lq1.1 77400 ; Shouldn't ever get here uCall 27 ; Sq0.7 uCall 37 ; Sq1.7 uCall 26 ; Sq0.6 .Z320: uCall 36 ; Sq1.6 uCall 25 ; Sq0.5 uCall 35 ; Sq1.5 uCall 24 ; Sq0.4 uCall 34 ; Sq1.4 uCall 23 ; Sq0.3 uCall 33 ; Sq1.3 uCall 22 ; Sq0.2 .Z330: uCall 32 ; Sq1.2 uCall 21 ; Sq0.1 uCall 31 ; Sq1.1 77400 ; Shouldn't ever get here 77400 0 ; ZsMax 0 ; ZsNxt 0 ; ZsMin ; Routines dispatched through page 0. ; Note that Bldr will not let us put absolute addresses here, so ; we use self-relative addresses which InitBcplRuntime must fix up. .Z340: Ior-. Xor-. Eqv-. Mult-. DivRem-. DivRem-. Lsh-. Rsh-. .Z350: Branch-. Lookup-. NotImp-. ; Was once Util Finish-. Abort-. LongJump-. NotImp-. ; GetLv MulPlus-. .Z360: Snq0-. Snq1-. Ly01-. Ly10-. Sy01-. Sy10-. Return-. NotImp-. ; StoreArgs .Z370: GetFrame-. NotImp-. ; GetFrmAlt 0 0 NotImp-. ; Lwb01 NotImp-. ; Lwb10 NotImp-. ; Swb01 NotImp-. ; Swb10 ; Code for routines dispatched through page zero Ior: uCall 45 Xor: uCall 46 Eqv: uCall 47 Mult: uCall 50 DivRem: uCall 51 Lsh: uCall 44 Rsh: uCall 43 Branch: uCall 41 Lookup: uCall 42 LongJump: uCall 40 MulPlus: uCall 52 Snq0: uCall 20 Snq1: uCall 30 Ly01: uCall 53 Ly10: uCall 54 Sy01: uCall 55 Sy10: uCall 56 Return: uReturn ; Frame allocator -- microcode returns if stack overflows GetFrame: uGetFrame jsr SwatPrint 1000. ; ecStackOverflow ; Runtime routines that aren't microcoded NotImp: jsr SwatPrint 1001. ; ecUnimplemented SwatPrint: mov 3 1 ; Pointer to error code jsr swat1 .txt "Sys.Errors" swat1: mov 3 0 ; Pointer to error filename 77403 ; Call Swat error printing facility Abort: mkone 0 0 skp ; fcAbort Finish: mkzero 0 0 ; fcOK jsrii .+1 OsFinish ; InitBcplRuntime() ; Replaces the standard Bcpl runtime transfer vector with the one ; in this package, after saving the old one. Enables a userFinishProc ; to restore the old transfer vector at finish time. ; Assumes the companion microcode has already been loaded. ; Note: if you Junta past levBcpl, InitBcplRuntime must be called ; before any other initialization that queues up userFinishProcs, ; so as to ensure that our userFinishProc is executed last. ; Otherwise, the standard transfer vector will end up transferring ; into random garbage at the next Bcpl runtime call. ; This routine is called for both initialization and cleanup -- ; it tells which by looking at savedUserFinishProc .InitBcplRuntime: sta 3 1 2 dir ; Exchange locations 300-377 with the page zero image, except do not ; exchange words where the page zero image contains zero. lda 3 c300 ; Page zero pointer sta 3 2 2 lda 3 c100 ; Counter sta 3 3 2 lda 3 @lvZ300 ; Image pointer init1: lda 0 0 3 ; Get word from image snz 0 0 ; Zero? jmp init2 ; Yes, bypass lda 1 @2 2 ; Get word from page zero sta 1 0 3 ; Save in image lda 1 c100 ; See if relocation needed sgeu 0 1 add 3 0 ; Yes, do so sta 0 @2 2 ; Exchange init2: inc 3 3 ; Increment pointers isz 2 2 dsz 3 2 ; Decrement and test count jmp init1 ; See whether initializing or cleaning up eir lda 3 @lvLvUserFinishProc lda 0 savedUserFinishProc com# 0 0 szr jmp init3 ; Initializing, set up a userFinishProc lda 0 0 3 ; Save old userFinishProc sta 0 savedUserFinishProc lda 0 @lvInitBcplRuntime ; Install ours ; Cleaning up, restore saved userFinishProc init3: sta 0 0 3 lda 3 1 2 jmp 1 3 c300: 300 c100: 100 lvZ300: Z300 lvLvUserFinishProc: lvUserFinishProc lvInitBcplRuntime: InitBcplRuntime savedUserFinishProc: -1 .end