mdw@git.distorted.org.uk Git - ssr/blob - StraySrc/Libraries/Sapphire/s/resources

   1 ;
   2 ; resources.s
   3 ;
   4 ; Access to shared resource DLL (MDW)
   5 ;
   6 ; © 1995-1998 Straylight
   7 ;
   8
   9 ;----- Licensing note -------------------------------------------------------
  10 ;
  11 ; This file is part of Straylight's Sapphire library.
  12 ;
  13 ; Sapphire 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 ; Sapphire 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 Sapphire.  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     sapphire:except
  37                 GET     sapphire:sapphire
  38
  39 rsc__version    EQU     100
  40
  41 ;----- Main code ------------------------------------------------------------
  42
  43                 AREA    |Sapphire$$Code|,CODE,READONLY
  44
  45 ; --- resources_init ---
  46 ;
  47 ; On entry:     --
  48 ;
  49 ; On exit:      --
  50 ;
  51 ; Use:          Initialises the shared resource system, setting up the
  52 ;               link to the SapphRes DLL.  Note that this initialisation is
  53 ;               /not/ performed automatically.
  54
  55                 EXPORT  resources_init
  56 resources_init  ROUT
  57
  58                 STMFD   R13!,{R0,R1,R12,R14}    ;Save some registers
  59                 WSPACE  rsc__wSpace             ;Find my workspace
  60                 LDR     R14,rsc__find           ;Locate the function pointer
  61                 CMP     R14,#0                  ;Have I set it up?
  62                 LDMNEFD R13!,{R0,R1,R12,PC}^    ;I guess so then
  63                 MOV     R14,#0                  ;A nice null pointer
  64                 STR     R14,rsc__dllHandle      ;Resource DLL not found yet
  65
  66                 ; --- Save the application handle
  67
  68                 SWI     XDLL_SaveHandle         ;Find my current app handle
  69                 BVS     %90resources_init       ;Failed -- return now then
  70                 STR     R0,rsc__appHandle       ;Save that away
  71
  72                 ; --- Now do the dynamic linking ---
  73
  74                 ADR     R0,rsc__dllName         ;Point to the DLL name
  75                 LDR     R1,=rsc__version        ;Load the resource version
  76                 SWI     XDLL_Find               ;Try to find the version
  77                 STRVC   R0,rsc__dllHandle       ;Store the DLL handle
  78                 ADRVC   R1,rsc__findRsc         ;Point to routine name
  79                 SWIVC   XDLL_FindEntry          ;Try to find the entry
  80                 STRVC   R0,rsc__find            ;Store this away nicely
  81
  82                 ; --- Initialise things which we need ---
  83
  84                 BL      except_init             ;We need to finalise properly
  85
  86                 ; --- Set up the finalisation ---
  87
  88                 ADR     R0,rsc__closeDown       ;Point to the exit handler
  89                 MOV     R1,R12                  ;Pass it my workspace
  90                 BL      except_atExit           ;And register the handler
  91
  92 90              LDMFD   R13!,{R0,R1,R12,PC}^    ;Return to caller when done
  93
  94 rsc__dllName    DCB     "[Sapphire.Resources]",0
  95 rsc__findRsc    DCB     "sapphRes_find",0
  96
  97                 LTORG
  98
  99 ; --- resources_find ---
 100 ;
 101 ; On entry:     R0 == resource code
 102 ;               R1 == pointer to name (only for rsType_template)
 103 ;
 104 ; On exit:      CS if found, and
 105 ;                 R0 == pointer to resource
 106 ;                 R1 == pointer to resource limit (only for rsType_message)
 107 ;               else CC and
 108 ;                 R0,R1 preserved
 109 ;
 110 ; Use:          Locates resources in the shared resource DLL.
 111
 112                 EXPORT  resources_find
 113 resources_find  ROUT
 114
 115                 STMFD   R13!,{R12,R14}          ;Save some registers
 116                 WSPACE  rsc__wSpace             ;Locate my workspace address
 117                 LDR     R12,rsc__find           ;Load the routine pointer
 118                 CMP     R12,#0                  ;Have we found the DLL?
 119                 BEQ     %90resources_find       ;No -- skip
 120                 MOV     R14,PC                  ;Set up return address
 121                 MOV     PC,R12                  ;Call the routine
 122                 LDMFD   R13!,{R12,R14}          ;Restore caller's registers
 123                 ORRCSS  PC,R14,#C_flag          ;Set C if C must be set
 124                 BICCCS  PC,R14,#C_flag          ;Clear C if C must be clear
 125
 126 90              LDMFD   R13!,{R12,R14}          ;Restore caller's registers
 127                 BICS    PC,R14,#C_flag          ;Couldn't find the resource
 128
 129                 LTORG
 130
 131 ; --- rsc__closeDown ---
 132 ;
 133 ; On entry:     --
 134 ;
 135 ; On exit:      --
 136 ;
 137 ; Use:          Closes down the shared resource DLL.
 138
 139 rsc__closeDown  ROUT
 140
 141                 STMFD   R13!,{R0,R14}           ;Save some registers
 142                 LDR     R0,rsc__appHandle       ;Load my application handle
 143                 SWI     XDLL_RestoreHandle      ;Set that up nicely
 144                 LDR     R0,rsc__dllHandle       ;Recover the DLL handle
 145                 SWI     XDLL_Lose               ;No longer need this
 146                 LDMFD   R13!,{R0,PC}^           ;And return to caller
 147
 148                 LTORG
 149
 150 rsc__wSpace     DCD     0
 151
 152 ;----- Workspace ------------------------------------------------------------
 153
 154                 ^       0,R12
 155 rsc__wStart     #       0
 156
 157 rsc__find       #       4                       ;Address of sapphRes_find
 158 rsc__appHandle  #       4                       ;Our application handle
 159 rsc__dllHandle  #       4                       ;SapphRes's DLL handle
 160
 161 rsc__wSize      EQU     {VAR}-rsc__wStart
 162
 163                 AREA    |Sapphire$$LibData|,CODE,READONLY
 164
 165                 DCD     rsc__wSize
 166                 DCD     rsc__wSpace
 167                 DCD     0
 168                 DCD     0
 169
 170 ;----- That's all, folks ----------------------------------------------------
 171
 172                 END