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annotate lib/alib/jsr_cmd.as @ 3054:22ddd48b4ec2

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level1 krn: Fix scheduler bug that only affected 6309 The original 6809 binary was correct, but it was disassembled and interpreted wrongly, so that reassembly went wrong on 6309.
author Tormod Volden <debian.tormod@gmail.com>
date Sun, 25 Jan 2015 22:36:02 +0100
parents 03f26e88b809
children
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1 ***************************************
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2
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3 * Subroutine to jsr to subroutine from 1 character command table
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4
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5 * OTHER MODULES NEEDED: none
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6
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7 * ENTRY: A=1 char command
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8 * X=start of jump table
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9
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10 * EXIT: CC carry set if entry not found
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11 * all other regs can be modified by subs
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12
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13 * Note format of table: each entry is three bytes
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14 * 0-match character (command)
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15 * 1..2-offset to routine
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16
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17 * It is the user's job to set commands to proper case for matching...
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18
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19 * end of table=NULL
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20
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21 * sample table: fcc /A/
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22 * fdb routineA-*
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23 * fcc /B/
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24 * fdb routineB-*
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25 * fcb 0
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28 nam Jsr to 1 char Command
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29 ttl Assembler Library Module
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30
2782
aaba193af04f Updated code to use lwasm/lwlink
Boisy Pitre <boisy.pitre@nuance.com>
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31 section .text
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32
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33 JSR_CMD:
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34 tst ,x end of table?
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35 beq jsrerr
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36
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37 cmpa ,x+ found match?
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38 beq docmd yes, go do it
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39
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40 leax 2,x next entry
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41 bra JSR_CMD
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42
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43 * no match found, return with carry set
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44
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45 jsrerr
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46 coma set error flag
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47 rts
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48
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49 * command found, do call and return
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50
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51 docmd
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52 ldd ,x get offset to routine
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53 jsr d,x
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54 andcc #%11111110 clear carry
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55 rts
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57 endsect