| 1 | /* |
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| 2 | * cpu32bug.S -- board support for the CPU32BUG monitor. |
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| 3 | * |
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| 4 | * Copyright (c) 1995, 1996 Cygnus Support |
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| 5 | * |
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| 6 | * The authors hereby grant permission to use, copy, modify, distribute, |
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| 7 | * and license this software and its documentation for any purpose, provided |
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| 8 | * that existing copyright notices are retained in all copies and that this |
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| 9 | * notice is included verbatim in any distributions. No written agreement, |
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| 10 | * license, or royalty fee is required for any of the authorized uses. |
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| 11 | * Modifications to this software may be copyrighted by their authors |
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| 12 | * and need not follow the licensing terms described here, provided that |
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| 13 | * the new terms are clearly indicated on the first page of each file where |
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| 14 | * they apply. |
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| 15 | */ |
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| 16 | |
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| 17 | #include "asm.h" |
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| 18 | #include "cpu32bug.h" |
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| 19 | |
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| 20 | .title "cpu32bug.S for m68k-coff" |
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| 21 | |
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| 22 | .text |
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| 23 | .global SYM (_exit) |
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| 24 | .global SYM (outln) |
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| 25 | .global SYM (outbyte) |
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| 26 | .global SYM (putDebugChar) |
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| 27 | .global SYM (inbyte) |
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| 28 | .global SYM (getDebugChar) |
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| 29 | .global SYM (havebyte) |
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| 30 | |
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| 31 | /* |
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| 32 | * _exit -- Exit from the application. Normally we cause a user trap |
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| 33 | * to return to the ROM monitor for another run. |
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| 34 | */ |
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| 35 | .text |
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| 36 | .align 2 |
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| 37 | SYM (_exit): |
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| 38 | link fp, IMM(0) |
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| 39 | trap IMM(15) |
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| 40 | .word RETURN |
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| 41 | |
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| 42 | /* |
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| 43 | * inbyte -- get a byte from the serial port |
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| 44 | * d0 - contains the byte read in |
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| 45 | */ |
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| 46 | .text |
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| 47 | .align 2 |
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| 48 | SYM (getDebugChar): /* symbol name used by m68k-stub */ |
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| 49 | SYM (inbyte): |
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| 50 | link fp, IMM(-8) |
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| 51 | trap IMM(15) |
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| 52 | .word INCHR |
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| 53 | moveb sp@, d0 |
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| 54 | extw d0 |
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| 55 | extl d0 |
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| 56 | unlk fp |
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| 57 | rts |
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| 58 | |
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| 59 | /* |
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| 60 | * outbyte -- sends a byte out the serial port |
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| 61 | * d0 - contains the byte to be sent |
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| 62 | */ |
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| 63 | .text |
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| 64 | .align 2 |
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| 65 | SYM (putDebugChar): /* symbol name used by m68k-stub */ |
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| 66 | SYM (outbyte): |
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| 67 | link fp, IMM(-4) |
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| 68 | moveb fp@(11), sp@ |
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| 69 | trap IMM(15) |
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| 70 | .word OUTCHR |
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| 71 | unlk fp |
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| 72 | rts |
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| 73 | |
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| 74 | /* |
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| 75 | * outln -- sends a string of bytes out the serial port with a CR/LF |
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| 76 | * a0 - contains the address of the string's first byte |
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| 77 | * a1 - contains the address of the string's last byte |
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| 78 | */ |
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| 79 | .text |
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| 80 | .align 2 |
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| 81 | SYM (outln): |
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| 82 | link fp, 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 fp |
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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 | .text |
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| 95 | .align 2 |
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| 96 | SYM (outstr): |
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| 97 | link fp, IMM(-8) |
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| 98 | moveml a0/a1, sp@ |
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| 99 | trap IMM(15) |
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| 100 | .word OUTSTR |
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| 101 | unlk fp |
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| 102 | rts |
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| 103 | |
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| 104 | /* |
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| 105 | * havebyte -- checks to see if there is a byte in the serial port, |
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| 106 | * returns 1 if there is a byte, 0 otherwise. |
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| 107 | */ |
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| 108 | .text |
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| 109 | .align 2 |
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| 110 | SYM (havebyte): |
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| 111 | trap IMM(15) |
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| 112 | .word INSTAT |
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| 113 | beqs empty |
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| 114 | movel IMM(1), d0 |
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| 115 | rts |
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| 116 | empty: |
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| 117 | movel IMM(0), d0 |
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| 118 | rts |
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