Search found 76 matches

by gray
Mon Feb 07, 2022 6:34 am
Forum: Astrobe for FPGA RISC5
Topic: Register R13
Replies: 2
Views: 1432

Re: Register R13

Thanks for the pointers. I don't have intention to change the compiler to use R13, but I am grinding my teeth on an in-circuit debugger, and an otherwise unused register could be handy from assembly code. ;)
by gray
Fri Feb 04, 2022 9:13 am
Forum: Astrobe for FPGA RISC5
Topic: Register R13
Replies: 2
Views: 1432

Register R13

ORG.incR allocates registers up to R11. R12 is MT, R14 is SP, and R15 is LNK. What about R13, may I use it, or does it have a special purpose as well?
by gray
Fri Feb 04, 2022 9:07 am
Forum: Astrobe for FPGA RISC5
Topic: SYSTEM.LDREG
Replies: 1
Views: 1080

SYSTEM.LDREG

The Astrobe RISC5 compiler creates erroneous code in the following case: PROCEDURE P; VAR i: INTEGER; BEGIN i := 0; SYSTEM.LDREG(i, 13) END P; The procedure compiles without error message, but the code created is: 4400000DH MOV r4, r0, 13 Evidently, the target register number must be a constant, as ...
by gray
Tue Jan 18, 2022 1:08 pm
Forum: Astrobe for FPGA RISC5
Topic: RISC5 Oberon Compiler Source Code
Replies: 1
Views: 1333

Re: RISC5 Oberon Compiler Source Code

Wow. Thanks! Also for CPIde.
by gray
Sat Jan 15, 2022 8:01 am
Forum: Astrobe for FPGA RISC5
Topic: Spurious Imports
Replies: 5
Views: 2714

Re: Spurious Imports

Thanks! The indirectly imported modules do count as regards the max allowed 15 imported modules, which we can check in the BL opcode of an external procedure call, where the module number is encoded in a 4 bit value (hence the restriction of 15, zero is not a valid module number for BL instructions)...
by gray
Sat Jan 01, 2022 9:53 am
Forum: Astrobe for FPGA RISC5
Topic: Spurious Imports
Replies: 5
Views: 2714

Re: Spurious Imports

OK, thanks, I have read up. Does the Astrobe compiler more or less work like the Project Oberon one in that area? In particular the import and export of symbols (reading and writing of symbol files, ORB. Import and ORB.Export) and creating object files (ORG.Close)? The way the symbol table is built ...
by gray
Thu Dec 30, 2021 11:39 am
Forum: Astrobe for FPGA RISC5
Topic: Spurious Imports
Replies: 5
Views: 2714

Spurious Imports

In the process of debugging an inexplicable error during the system start-up sequence I started to look into 'rsc' files (yes, I know), namely the list of imported modules. I have realised that the list of imports in the 'rsc' files sometimes contains additional modules that are not in the IMPORT li...
by gray
Thu Dec 30, 2021 10:56 am
Forum: Bug Reports
Topic: System.Exception in RISC5 Compiler
Replies: 0
Views: 1364

System.Exception in RISC5 Compiler

Test case: MODULE M1; CONST OK := M2.OK; END M1. Note the missing IMPORT statement. With the v8.0 compiler: OR Compiler 17.10.2021 compiling M1 2 14 Error: = ? 2 18 Error: undef System.Exception: CASE-trap: selector = 54 at ORP.ORP.factor(Item& x) at ORP.ORP.term(Item& x) at ORP.ORP.SimpleExpression...
by gray
Thu Oct 28, 2021 5:21 am
Forum: Astrobe for FPGA RISC5
Topic: System.Date (v8.0)
Replies: 1
Views: 2158

Re: System.Date (v8.0)

Checking for the correctness of the date and time actually set is also useful as we actually can set the clock even with incorrect parameters. Here are two example cases with incorrect parameters where the clock gets set nonetheless. Typos happen. :( System.Date 28 10 n21 10 20 30 System.Date 28 10 ...
by gray
Mon Oct 25, 2021 9:19 am
Forum: Astrobe for FPGA RISC5
Topic: System.Date (v8.0)
Replies: 1
Views: 2158

System.Date (v8.0)

The new System.Date procedure in v8.0: PROCEDURE Date*; (* ... *) BEGIN (* ... *) IF S.class = Texts.Int THEN (*set clock*) (* ... *) IF (day >= 1) & (day <= 31) & (mo >= 1) & (mo <= 12) & (yr >= 0) & (yr <= 63) THEN dt := ((((yr*16 + mo)*32 + day)*32 + hr)*64 + min)*64 + sec; Kernel.SetClock(dt) EN...