mdw@git.distorted.org.uk Git - ssr/blob - StraySrc/Libraries/BAS/src/s/vars

   1 ;
   2 ; vars.s
   3 ;
   4 ; Setting up useful variables for BAS
   5 ;
   6 ; © 1994-1998 Straylight
   7 ;
   8
   9 ;----- Licensing note -------------------------------------------------------
  10 ;
  11 ; This file is part of Straylight's BASIC Assembler Supplement.
  12 ;
  13 ; BAS is free software; you can redistribute it and/or modify
  14 ; it under the terms of the GNU General Public License as published by
  15 ; the Free Software Foundation; either version 2, or (at your option)
  16 ; any later version.
  17 ;
  18 ; BAS is distributed in the hope that it will be useful,
  19 ; but WITHOUT ANY WARRANTY; without even the implied warranty of
  20 ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21 ; GNU General Public License for more details.
  22 ;
  23 ; You should have received a copy of the GNU General Public License
  24 ; along with BAS.  If not, write to the Free Software Foundation,
  25 ; 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  26
  27 ;----- Standard header ------------------------------------------------------
  28
  29                 GET     libs:header
  30                 GET     libs:swis
  31
  32                 GET     libs:stream
  33
  34 ;----- External dependencies ------------------------------------------------
  35
  36                 GET     sh.bas
  37                 GET     sh.basTalk
  38
  39 ;----- Main code ------------------------------------------------------------
  40
  41                 AREA    |BAS$$Code|,CODE,READONLY
  42
  43 ; --- vars__setAscending ---
  44 ;
  45 ; On entry:     R3 == pointer to a name table
  46 ;
  47 ; On exit:      R3 points past the table
  48 ;
  49 ; Use:          Sets the variables named in the given table to have integer
  50 ;               values from 0 upwards.  The table contains null-terminated
  51 ;               strings and is terminated by a null string.
  52
  53 vars__setAscending ROUT
  54
  55                 STMFD   R13!,{R0-R2,R4,R14}     ;Save some registers
  56                 MOV     R4,#0                   ;Start counting at 0
  57 00              MOV     R0,R3                   ;Point at the string
  58                 MOV     R2,R4                   ;Get the next value to set
  59                 LDRB    R14,[R3],#1             ;Load first byte from string
  60                 CMP     R14,#0                  ;Is it the end of the table?
  61                 LDMEQFD R13!,{R0-R2,R4,PC}^     ;Yes -- we've finished then
  62                 ADD     R4,R4,#1                ;Increment the counter
  63 10              LDRB    R14,[R3],#1             ;Load next byte from string
  64                 CMP     R14,#1                  ;Alternative name?
  65                 SUBEQ   R4,R4,#1                ;Yes -- don't bump counter
  66                 CMPNE   R14,#0                  ;Is it the end yet?
  67                 BNE     %10vars__setAscending   ;No -- go round for more
  68                 BL      bTalk_create            ;Create the variable
  69                 BL      bTalk_store             ;Store the value away
  70                 B       %00vars__setAscending   ;Set the next variable
  71
  72                 LTORG
  73
  74 ; --- vars_set ---
  75 ;
  76 ; On entry:     --
  77 ;
  78 ; On exit:      --
  79 ;
  80 ; Use:          Sets up variable names for registers (normal and APCS) and
  81 ;               also for condition codes.
  82
  83                 EXPORT  vars_set
  84 vars_set        ROUT
  85
  86                 STMFD   R13!,{R0,R14}           ;Save some registers
  87                 ADR     R3,vars__names          ;Point to big name table
  88                 BL      vars__setAscending      ;Standard registers
  89                 BL      vars__setAscending      ;APCS registers
  90                 BL      vars__setAscending      ;Standard condition names
  91                 LDMFD   R13!,{R0,PC}^           ;And return to caller
  92
  93 vars__names     DCB     "R0",1,"r0",0
  94                 DCB     "R1",1,"r1",0
  95                 DCB     "R2",1,"r2",0
  96                 DCB     "R3",1,"r3",0
  97                 DCB     "R4",1,"r4",0
  98                 DCB     "R5",1,"r5",0
  99                 DCB     "R6",1,"r6",0
 100                 DCB     "R7",1,"r7",0
 101                 DCB     "R8",1,"r8",0
 102                 DCB     "R9",1,"r9",0
 103                 DCB     "R10",1,"r10",0
 104                 DCB     "R11",1,"r11",0
 105                 DCB     "R12",1,"r12",0
 106                 DCB     "R13",1,"SP",1,"r13",1,"sp",0
 107                 DCB     "R14",1,"LR",1,"LK",1,"r14",1,"lr",1,"lk",0
 108                 DCB     "R15",1,"PC",1,"r15",1,"pc",0
 109                 DCB     0
 110
 111                 DCB     "a1",0
 112                 DCB     "a2",0
 113                 DCB     "a3",0
 114                 DCB     "a4",0
 115                 DCB     "v1",0
 116                 DCB     "v2",0
 117                 DCB     "v3",0
 118                 DCB     "v4",0
 119                 DCB     "v5",0
 120                 DCB     "v6",1,"sb",0
 121                 DCB     "v7",1,"sl",0
 122                 DCB     "fp",0
 123                 DCB     "ip",0
 124                 DCB     "sp",0
 125                 DCB     "lr",0
 126                 DCB     "pc",0
 127                 DCB     0
 128
 129                 DCB     "EQ",1,"eq",1,"ZS",1,"zs",0
 130                 DCB     "NE",1,"ne",1,"ZC",1,"zc",0
 131                 DCB     "CS",1,"cs",1,"HS",1,"hs",0
 132                 DCB     "CC",1,"cc",1,"LO",1,"lo",0
 133                 DCB     "MI",1,"mi",1,"NS",1,"ns",0
 134                 DCB     "PL",1,"pl",1,"NC",1,"nc",0
 135                 DCB     "VS",1,"vs",0
 136                 DCB     "VC",1,"vc",0
 137                 DCB     "HI",1,"hi",0
 138                 DCB     "LS",1,"ls",0
 139                 DCB     "GE",1,"ge",0
 140                 DCB     "LT",1,"lt",0
 141                 DCB     "GT",1,"gt",0
 142                 DCB     "LE",1,"le",0
 143                 DCB     "AL",1,"al",0
 144                 DCB     "NV",1,"nv",0
 145                 DCB     0
 146
 147                 LTORG
 148
 149 ;----- That's all, folks ----------------------------------------------------
 150
 151                 END