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

   1 ;
   2 ; stub.s
   3 ;
   4 ; Stub loader for dynamically linked Sapphire
   5 ;
   6 ; © 1994-1998 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                 IMPORT  sapphire_doInit
  37                 IMPORT  sapphire_doLibInit
  38                 IMPORT  sapphire_doDisable
  39                 IMPORT  except_init
  40                 IMPORT  except_atExit
  41
  42                 IMPORT  |DLL$$ExternalTable$$Base|,WEAK
  43                 IMPORT  |DLL$$ExternalTable$$Limit|,WEAK
  44
  45                 IMPORT  |Image$$RW$$Limit|,WEAK
  46
  47                 IMPORT  |Sapphire$$LibData$$Base|,WEAK
  48                 IMPORT  |Sapphire$$LibData$$Limit|,WEAK
  49                 IMPORT  |Sapphire$$ClientData$$Base|,WEAK
  50                 IMPORT  |Sapphire$$ClientData$$Limit|,WEAK
  51                 IMPORT  |Sapphire$$ExtTable$$Base|,WEAK
  52                 IMPORT  |Sapphire$$ExtTable$$Limit|,WEAK
  53
  54 ;----- Main code ------------------------------------------------------------
  55
  56                 AREA    |Sapphire$$Code|,CODE,READONLY
  57
  58                 EXPORT  |_dll_findall|
  59 |_dll_findall|  EQU     0
  60
  61 ; --- sapphire_init ---
  62 ;
  63 ; On entry:     R0 == pointer to application name
  64 ;               R1 == client workspace size
  65 ;               R2 == requested size of stack
  66 ;
  67 ; On exit:      R10 == pointer to heap
  68 ;               R11 == pointer to scratchpad and environment information
  69 ;               R12 == pointer to client workspace
  70 ;               R13 == stack pointer
  71 ;               Other registers corrupted
  72 ;
  73 ; Use:          Initialises the Sapphire library.
  74
  75                 EXPORT  sapphire_init
  76 sapphire_init   ROUT
  77
  78                 ; --- Save arguments in high registers ---
  79
  80                 STR     R14,sapph__space        ;Save return address
  81                 MOV     R8,R0                   ;Keep application name ptr
  82                 MOV     R9,R1                   ;Keep workspace size value
  83                 MOV     R10,R2                  ;Keep stack size too
  84
  85                 ; --- Load in requested DLLs ---
  86
  87                 ADR     R0,sapph__dllTable      ;Point to DLL table thing
  88                 LDMIA   R0,{R0,R1}              ;Load the base and limit
  89                 SWI     DLL_FindFromTable       ;Load the DLLs I want
  90
  91                 ; --- Set up application name ---
  92
  93                 MOV     R0,R8                   ;Point to client app name
  94                 SWI     DLL_NameApp             ;Register application name
  95
  96                 ; --- Initialise the library ---
  97
  98                 MOV     R0,R8                   ;Point to the name again
  99                 MOV     R1,R9                   ;Get workspace size wanted
 100                 MOV     R2,R10                  ;Get the stack size
 101                 ADR     R3,sapph__initTable     ;Point to initialisation tbl
 102                 BL      sapphire_doInit         ;Do the main initialisation
 103
 104                 ; --- Now add in atexit routine ---
 105
 106                 LDR     R14,sapph__space        ;Load the return address
 107                 STMFD   R13!,{R14}              ;Save it on the stack
 108                 SWI     DLL_SaveHandle          ;Find my application handle
 109                 BL      except_init             ;Initialise exception handler
 110                 MOV     R1,R0                   ;Pass this value in R12
 111                 ADR     R0,sapph__closeDown     ;Point to shutdown routine
 112                 BL      except_atExit           ;Register my routine
 113                 LDMFD   R13!,{PC}^              ;And return to caller
 114
 115 sapph__dllTable DCD     |DLL$$ExternalTable$$Base|
 116                 DCD     |DLL$$ExternalTable$$Limit|
 117
 118 sapph__initTable
 119                 DCD     |Image$$RW$$Limit|
 120                 DCD     |Sapphire$$LibData$$Base|
 121                 DCD     |Sapphire$$LibData$$Limit|
 122                 DCD     |Sapphire$$ClientData$$Base|
 123                 DCD     |Sapphire$$ClientData$$Limit|
 124                 DCD     -1
 125                 DCD     |Sapphire$$ExtTable$$Base|
 126                 DCD     |Sapphire$$ExtTable$$Limit|
 127
 128 sapph__space    DCD     0
 129
 130                 LTORG
 131
 132 ; --- sapph__closeDown ---
 133 ;
 134 ; On entry:     R12 == application handle
 135 ;
 136 ; On exit:      --
 137 ;
 138 ; Use:          Deregisters the application with the DLLManager module.
 139
 140 sapph__closeDown ROUT
 141
 142                 STMFD   R13!,{R0,R14}           ;Save some registers
 143                 MOV     R0,R12                  ;Get application handle
 144                 SWI     DLL_RestoreHandle       ;Find the handle again
 145                 SWI     DLL_AppDying            ;Deregister this application
 146                 LDMFD   R13!,{R0,PC}^           ;And return to caller
 147
 148                 LTORG
 149
 150 ; --- sapphire_libInit ---
 151 ;
 152 ; On entry:     --
 153 ;
 154 ; On exit:      --
 155 ;
 156 ; Use:          Initialises all library sections.
 157
 158                 EXPORT  sapphire_libInit
 159 sapphire_libInit
 160                 STMFD   R13!,{R0,R14}           ;Save a register
 161                 ADR     R0,sapph__initTable     ;Point to initialisation tbl
 162                 BL      sapphire_doLibInit      ;Actually do this job
 163                 LDMFD   R13!,{R0,PC}^           ;And return to caller
 164
 165                 LTORG
 166
 167 ; --- sapphire_disable ---
 168 ;
 169 ; On entry:     R0 == pointer to list of initialise routines.
 170 ;
 171 ; On exit:      --
 172 ;
 173 ; Use:          Inactivates Sapphire units.
 174
 175                 EXPORT  sapphire_disable
 176 sapphire_disable
 177                 STMFD   R13!,{R1,R14}           ;Save a register
 178                 ADR     R1,sapph__initTable     ;Point to initialisation tbl
 179                 BL      sapphire_doDisable      ;Actually do this job
 180                 LDMFD   R13!,{R1,PC}^           ;And return to caller
 181
 182                 LTORG
 183
 184 ;----- That's all, folks ----------------------------------------------------
 185
 186                 END