| 1 | /* mvme.S -- board support for m68k |
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| 2 | * |
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| 3 | * Copyright (c) 1995, 1996 Cygnus Support |
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| 4 | * |
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| 5 | * The authors hereby grant permission to use, copy, modify, distribute, |
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| 6 | * and license this software and its documentation for any purpose, provided |
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| 7 | * that existing copyright notices are retained in all copies and that this |
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| 8 | * notice is included verbatim in any distributions. No written agreement, |
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| 9 | * license, or royalty fee is required for any of the authorized uses. |
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| 10 | * Modifications to this software may be copyrighted by their authors |
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| 11 | * and need not follow the licensing terms described here, provided that |
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| 12 | * the new terms are clearly indicated on the first page of each file where |
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| 13 | * they apply. |
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| 14 | */ |
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| 15 | |
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| 16 | #include "asm.h" |
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| 17 | |
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| 18 | .title "mvme.S for m68k-coff" |
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| 19 | |
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| 20 | .align 2 |
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| 21 | .text |
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| 22 | .global SYM (_exit) |
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| 23 | .global SYM (outln) |
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| 24 | .global SYM (outbyte) |
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| 25 | .global SYM (putDebugChar) |
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| 26 | .global SYM (inbyte) |
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| 27 | .global SYM (getDebugChar) |
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| 28 | .global SYM (havebyte) |
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| 29 | .global SYM (exceptionHandler) |
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| 30 | |
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| 31 | .set vbr_size, 0x400 |
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| 32 | .comm SYM (vbr_table), vbr_size |
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| 33 | |
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| 34 | /* |
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| 35 | * _exit -- Exit from the application. Normally we cause a user trap |
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| 36 | * to return to the ROM monitor for another run. |
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| 37 | */ |
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| 38 | SYM (_exit): |
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| 39 | unlk a6 |
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| 40 | trap IMM(15) |
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| 41 | .word return |
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| 42 | |
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| 43 | .align 2 |
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| 44 | |
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| 45 | /* |
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| 46 | * inbyte -- get a byte from the serial port |
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| 47 | * d0 - contains the byte read in |
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| 48 | */ |
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| 49 | .align 2 |
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| 50 | SYM (getDebugChar): /* symbol name used by m68k-stub */ |
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| 51 | SYM (inbyte): |
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| 52 | link a6, IMM(-8) |
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| 53 | trap IMM(15) |
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| 54 | .word inchr |
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| 55 | moveb sp@, d0 |
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| 56 | extw d0 |
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| 57 | extl d0 |
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| 58 | unlk a6 |
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| 59 | rts |
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| 60 | |
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| 61 | /* |
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| 62 | * outbyte -- sends a byte out the serial port |
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| 63 | * d0 - contains the byte to be sent |
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| 64 | */ |
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| 65 | .align 2 |
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| 66 | SYM (putDebugChar): /* symbol name used by m68k-stub */ |
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| 67 | SYM (outbyte): |
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| 68 | link fp, IMM(-4) |
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| 69 | moveb fp@(11), sp@ |
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| 70 | trap IMM(15) |
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| 71 | .word outchr |
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| 72 | unlk fp |
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| 73 | rts |
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| 74 | |
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| 75 | /* |
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| 76 | * outln -- sends a string of bytes out the serial port with a CR/LF |
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| 77 | * a0 - contains the address of the string's first byte |
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| 78 | * a1 - contains the address of the string's last byte |
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| 79 | */ |
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| 80 | .align 2 |
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| 81 | SYM (outln): |
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| 82 | link a6, IMM(-8) |
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| 83 | moveml a0/a1, sp@ |
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| 84 | trap IMM(15) |
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| 85 | .word outln |
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| 86 | unlk a6 |
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| 87 | rts |
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| 88 | |
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| 89 | /* |
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| 90 | * outstr -- sends a string of bytes out the serial port without a CR/LF |
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| 91 | * a0 - contains the address of the string's first byte |
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| 92 | * a1 - contains the address of the string's last byte |
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| 93 | */ |
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| 94 | .align 2 |
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| 95 | SYM (outstr): |
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| 96 | link a6, IMM(-8) |
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| 97 | moveml a0/a1, sp@ |
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| 98 | trap IMM(15) |
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| 99 | .word outstr |
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| 100 | unlk a6 |
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| 101 | rts |
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| 102 | |
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| 103 | /* |
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| 104 | * havebyte -- checks to see if there is a byte in the serial port, |
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| 105 | * returns 1 if there is a byte, 0 otherwise. |
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| 106 | */ |
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| 107 | SYM (havebyte): |
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| 108 | trap IMM(15) |
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| 109 | .word instat |
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| 110 | beqs empty |
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| 111 | movel IMM(1), d0 |
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| 112 | rts |
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| 113 | empty: |
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| 114 | movel IMM(0), d0 |
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| 115 | rts |
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| 116 | |
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| 117 | /* |
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| 118 | * These constants are for the MVME-135 board's boot monitor. They |
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| 119 | * are used with a TRAP 15 call to access the monitor's I/O routines. |
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| 120 | * they must be in the word following the trap call. |
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| 121 | */ |
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| 122 | .set inchr, 0x0 |
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| 123 | .set instat, 0x1 |
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| 124 | .set inln, 0x2 |
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| 125 | .set readstr, 0x3 |
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| 126 | .set readln, 0x4 |
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| 127 | .set chkbrk, 0x5 |
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| 128 | |
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| 129 | .set outchr, 0x20 |
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| 130 | .set outstr, 0x21 |
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| 131 | .set outln, 0x22 |
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| 132 | .set write, 0x23 |
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| 133 | .set writeln, 0x24 |
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| 134 | .set writdln, 0x25 |
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| 135 | .set pcrlf, 0x26 |
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| 136 | .set eraseln, 0x27 |
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| 137 | .set writd, 0x28 |
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| 138 | .set sndbrk, 0x29 |
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| 139 | |
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| 140 | .set tm_ini, 0x40 |
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| 141 | .set dt_ini, 0x42 |
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| 142 | .set tm_disp, 0x43 |
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| 143 | .set tm_rd, 0x44 |
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| 144 | |
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| 145 | .set redir, 0x60 |
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| 146 | .set redir_i, 0x61 |
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| 147 | .set redir_o, 0x62 |
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| 148 | .set return, 0x63 |
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| 149 | .set bindec, 0x64 |
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| 150 | |
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| 151 | .set changev, 0x67 |
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| 152 | .set strcmp, 0x68 |
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| 153 | .set mulu32, 0x69 |
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| 154 | .set divu32, 0x6A |
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| 155 | .set chk_sum, 0x6B |
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