mdw@git.distorted.org.uk Git - ssr/blob - StraySrc/Libraries/Steel/s/wimp_dll

   1 ;
   2 ; wimp_dll.s
   3 ;
   4 ; Special DLL parts of wimp
   5 ;
   6 ; © 1994-1998 Straylight
   7 ;
   8
   9 ;----- Licensing note -------------------------------------------------------
  10 ;
  11 ; This file is part of Straylight's Steel library.
  12 ;
  13 ; Steel 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 ; Steel 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 Steel.  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 ;----- External dependencies ------------------------------------------------
  33
  34                 IMPORT  |_dll_wimpPoll|
  35                 IMPORT  |_dll_wimpPollIdle|
  36
  37 ;----- Some flags and things -----------------------------------------------
  38
  39 dpoll__savefp   EQU     1<<24                   ;Bit to set to save FP state
  40
  41 ;----- Private data ---------------------------------------------------------
  42
  43                 AREA    |C$$data|,DATA
  44
  45 wimp__savefp    DCD     1
  46
  47 ;----- Polling code ---------------------------------------------------------
  48
  49                 AREA    |C$$Code|,CODE,READONLY
  50
  51 ; --- wimp_poll ---
  52 ;
  53 ; On entry:     a1 == Wimp_Poll event mask
  54 ;               a2 == pointer to wimp_eventstr to be filled in
  55 ; On exit:      a1 == pointer to an os_error, or nothing
  56
  57                 EXPORT  wimp_poll
  58 wimp_poll       ROUT
  59
  60                 STMFD   sp!,{lr}                ;Look after some registers
  61
  62                 ; --- Figure out about saving the FP status ---
  63
  64                 LDR     a4,=wimp__savefp        ;Find the magic flag
  65                 LDR     ip,[sl,#-536]           ;Get the relocation
  66                 ADD     a4,ip,a4                ;And relocate this address
  67                 LDR     a4,[a4]                 ;Get the value of the flag
  68                 CMP     a4,#0                   ;Do we have to save FP state?
  69                 ORRNE   a1,a1,#dpoll__savefp    ;Yes -- set the flag
  70                 BICNE   a1,a1,#dpoll__savefp    ;No -- clear the flag
  71
  72                 ; --- Call the SWI and get out again ---
  73
  74                 ADD     a2,a2,#4                ;Point to the big poll block
  75                 BL      |_dll_wimpPoll|         ;Get a Wimp event
  76                 SUB     a2,a2,#4                ;Point to the wimp_eventstr
  77                 STRVC   a1,[a2]                 ;Store the reason code away
  78                 MOVVC   a1,#0                   ;If no error, return NULL
  79                 LDMFD   sp!,{pc}^               ;Return to caller nicely
  80
  81                 LTORG
  82
  83 ; --- wimp_pollidle ---
  84 ;
  85 ; On entry:     a1 == Wimp_Poll event mask
  86 ;               a2 == pointer to wimp_eventstr to be filled in
  87 ;               a3 == time before which thou shalt not return
  88 ; On exit:      a1 == pointer to an os_error, or nothing
  89
  90                 EXPORT  wimp_pollidle
  91 wimp_pollidle   ROUT
  92
  93                 STMFD   sp!,{lr}                ;Look after some registers
  94
  95                 ; --- Figure out about saving the FP status ---
  96
  97                 LDR     a4,=wimp__savefp        ;Find the magic flag
  98                 LDR     ip,[sl,#-536]           ;Get the relocation
  99                 ADD     a4,ip,a4                ;And relocate this address
 100                 LDR     a4,[a4]                 ;Get the value of the flag
 101                 CMP     a4,#0                   ;Do we have to save FP state?
 102                 ORRNE   a1,a1,#dpoll__savefp    ;Yes -- set the flag
 103                 BICNE   a1,a1,#dpoll__savefp    ;No -- clear the flag
 104
 105                 ; --- Call the SWI and get out again ---
 106
 107                 ADD     a2,a2,#4                ;Point to the big poll block
 108                 BL      |_dll_wimpPollIdle|     ;Get a Wimp event
 109                 SUB     a2,a2,#4                ;Point to the wimp_eventstr
 110                 STRVC   a1,[a2]                 ;Store the reason code away
 111                 MOVVC   a1,#0                   ;If no error, return NULL
 112                 LDMFD   sp!,{pc}^               ;Return to caller nicely
 113
 114                 LTORG
 115
 116 ; --- wimp_save_fp_state_on_poll ---
 117
 118                 EXPORT  wimp_save_fp_state_on_poll
 119 wimp_save_fp_state_on_poll
 120                 ROUT
 121
 122                 LDR     a1,=wimp__savefp        ;Find the magic flag
 123                 LDR     ip,[sl,#-536]           ;Get the relocation
 124                 ADD     a1,ip,a1                ;And relocate this address
 125                 MOV     a2,#1                   ;Store a TRUE value away
 126                 STR     a2,[a1]                 ;Tuck it into my workspace
 127                 MOVS    pc,lr                   ;Return to the caller
 128
 129                 LTORG
 130
 131 ; --- wimp_corrupt_fp_state_on_poll ---
 132
 133                 EXPORT  wimp_corrupt_fp_state_on_poll
 134 wimp_corrupt_fp_state_on_poll
 135                 ROUT
 136
 137                 LDR     a1,=wimp__savefp        ;Find the magic flag
 138                 LDR     ip,[sl,#-536]           ;Get the relocation
 139                 ADD     a1,ip,a1                ;And relocate this address
 140                 MOV     a2,#0                   ;Store a FALSE value away
 141                 STR     a2,[a1]                 ;Tuck it into my workspace
 142                 MOVS    pc,lr                   ;Return to the caller
 143
 144                 LTORG
 145
 146 ;----- Include the main wimp veneers ----------------------------------------
 147
 148                 LNK     s.wimp_main