2006-07-30 20:24:09 +00:00
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<html>
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<head>
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<title>AppleWin Debugger Tutorial</title>
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<meta http-equiv="CONTENT-TYPE" content="text/html; charset=windows-1252">
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</head>
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<body style="DIRECTION: ltr" lang="en-US">
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<h1>
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Execution</h1>
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<p>As you scroll around, you will notice the cursor and other lines change
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colors. Normally the cursor line is shown with an inverse bar, that is
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with a white background. Other colors have these meanings:
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</p>
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<table border="1" bordercolor="#000000" cellpadding="2" cellspacing="0" width="666">
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<COLGROUP>
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<col width="161">
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<col width="494">
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<tbody>
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<tr bgcolor="#000000">
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<td width="161">
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<p><font color="#ffffff"><b>Cursor Background</b></font></p>
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</td>
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<td width="494">
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<p><font color="#ffffff"><b>Effect</b></font></p>
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</td>
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</tr>
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<tr>
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<td width="161">
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<p>White
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</p>
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</td>
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<td width="494">
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<p><i>Address of cursor.</i></p>
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</td>
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</tr>
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<tr>
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<td bgcolor="#ffff00" width="161">
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<p>Yellow (Bright)</p>
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</td>
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<td width="494">
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<p><i>Cursor is on next 6502 instruction (At 6502 PC).</i></p>
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</td>
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</tr>
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<tr>
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<td bgcolor="#cccc00" width="161">
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<p>Yellow (Dim)</p>
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</td>
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<td width="494">
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<p><i>Line is next 6502 instruction (At 6502 PC).</i></p>
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</td>
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</tr>
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<tr>
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<td bgcolor="#ff0000" width="161">
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<p>Red (Bright)</p>
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</td>
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<td width="494">
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<p><i>Cursor is on active Breakpoint.</i></p>
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</td>
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</tr>
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</tbody>
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</table>
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<p><br>
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<br>
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</p>
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<p>Press Right Arrow to locate the current 6502 instruction. If you Page
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Down, you can see that Branch Indicators are displayed on the right side of the
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disassembly window, designated by <20><font face="Webdings, serif">5</font><EFBFBD> or <20><font face="Webdings, serif">6</font><EFBFBD>. </p>
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<p>Press Right Arrow to again locate the current instruction. You will also
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notice immediate instructions have a character single quoted, after them, such
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as <20><font face="Courier, monospace">I<EFBFBD></font> at $<b>FA75</b>.</p>
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<p>Pressing Space, will Trace (into) an instruction. Sometimes you trace
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into a JSR (subroutine), and wish you hadn't. Pressing Shift-Space will "<i>Step
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Out</i>" - that is, run until the Program Counter (PC) is equal to the
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return address on the stack. Pressing Left Arrow will jump the cursor to
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the next instruction after the original call.
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</p>
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<br>
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<p><font size="4"><b>Notes</b>:</font></p>
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<ul>
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<li>
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<p><i>Some code will place the arguments to the subroutine after the JSR
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instruction. The debugger is not able to detect this and "<b>Step Out</b>"
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correctly, so use caution, if the sub-routine plays with the stack.</i></p>
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<li>
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<p>
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<i>The debugger is not able to detect if the top 2 bytes on the stack is a valid
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return address, so pay careful attention if the stack is modified!</i></p>
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</li>
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</ul>
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<br>
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<table border="1" cellpadding="2" cellspacing="0" width="75%">
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<COLGROUP>
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<col width="26">
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<col width="64">
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<col width="166">
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<tbody>
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<tr bgcolor="#000000">
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<td width="10%">
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<p><font color="#ffffff"><b>Key</b></font></p>
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</td>
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<td width="25%">
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<p><font color="#ffffff"><b>Name</b></font></p>
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</td>
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<td width="65%">
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<p><font color="#ffffff"><b>Effect</b></font></p>
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</td>
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</tr>
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<tr>
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<td width="10%">
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<p><font face="Wingdings"><EFBFBD></font>
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</p>
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</td>
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<td width="25%">
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<p>Space
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</p>
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</td>
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<td width="65%">
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<p><i>Trace into instruction.</i></p>
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</td>
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</tr>
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<tr>
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<td width="10%">
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<p><font face="Wingdings"><EFBFBD><EFBFBD></font>
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</p>
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</td>
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<td width="25%">
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<p>Shift-Space
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</p>
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</td>
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<td width="65%">
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<p><i>Step out of subroutine.</i></p>
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</td>
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</tr>
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<tr>
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<td width="10%">
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<p>^<font face="Wingdings"><EFBFBD></font>
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</p>
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</td>
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<td width="25%">
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<p>Ctrl-Space
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</p>
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</td>
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<td width="65%">
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<p><i>Trace over instruction.</i></p>
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</td>
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</tr>
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<tr>
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<td width="10%">
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<p>^<font face="Wingdings"><EFBFBD></font>
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</p>
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</td>
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<td width="25%">
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<p>Ctrl-Down Arrow
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</p>
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</td>
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<td width="65%">
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<p><i>Run until cursor.</i></p>
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</td>
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</tr>
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<tr>
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<td width="10%">
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<p>^<font face="Wingdings"><EFBFBD></font>
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</p>
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</td>
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<td width="25%">
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<p>Ctrl-Right Arrow</p>
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</td>
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<td width="65%">
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<p><i>Set PC to cursor.</i></p>
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</td>
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</tr>
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<tr>
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<td width="10%">
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<p><font face="Wingdings"><EFBFBD></font>
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</p>
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</td>
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<td width="25%">
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<p>Left Arrow
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</p>
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</td>
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<td width="65%">
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<p><i>Jump cursor to return address on stack.</i></p>
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</td>
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</tr>
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</tbody>
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</table>
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<p><br>
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<br>
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</p>
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<table bgcolor="#000000" border="0" cellpadding="2" cellspacing="0" width="90%">
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<COLGROUP>
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<col width="90">
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<col width="166">
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<tbody>
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<tr bgcolor="#000000">
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<td width="35%">
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<p><font color="#ffffff"><b>Command</b></font></p>
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</td>
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<td width="65%">
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<p style="FONT-STYLE: normal"><font color="#ffffff"><b>Description</b></font></p>
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</td>
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</tr>
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<tr bgcolor="#cccccc">
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<td width="35%">
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2017-12-20 18:07:23 +00:00
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<p>G [StopAddress]<br>
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GG [StopAddress]</p>
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2006-07-30 20:24:09 +00:00
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</td>
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<td width="65%">
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<p><i>Resume execution until PC = StopAddress.</i></p>
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</td>
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</tr>
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<tr bgcolor="#999999">
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<td width="35%">
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2017-12-20 18:07:23 +00:00
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<p>G [StopAddress] [SkipAddress,Length]<br>
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GG [StopAddress] [SkipAddress,Length]</p>
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2006-07-30 20:24:09 +00:00
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</td>
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<td width="65%">
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<p><i>Resume execution until PC = StopAddress.<br>
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Additionally, if the PC exits the range [SkipAddress,Length],<br>
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execution will be halted.</i></p>
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</td>
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</tr>
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<tr bgcolor="#cccccc">
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<td width="35%">
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<p>####G</p>
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</td>
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<td width="65%">
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2017-12-20 18:07:23 +00:00
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<p><i>Alias for: R PC [=] address and then G.</i></p>
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2006-07-30 20:24:09 +00:00
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</td>
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</tr>
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</tbody>
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</table>
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2017-12-20 18:07:23 +00:00
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<p><br>NB. The GG command resumes execution in full-speed. See <a href="dbg-entering-debugger.html#Exiting-Debugger">Exiting the Debugger</a>.
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</p>
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2006-07-30 20:24:09 +00:00
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<p><br>
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<br>
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</p>
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<table bgcolor="#000000" border="0" cellpadding="2" cellspacing="0" width="90%">
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<COLGROUP>
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<col width="90">
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<col width="166">
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<tbody>
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<tr bgcolor="#00b8ff">
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<td bgcolor="#30c0ff" width="35%">
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<p><font color="#000000"><b>Input</b></font></p>
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</td>
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<td bgcolor="#30c0ff" width="65%">
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<p><font color="#000000"><b>Effect</b></font></p>
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</td>
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</tr>
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<tr bgcolor="#000000">
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<td width="35%">
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<p><font color="#00b8ff"><font face="Courier"><b>R PC FA62 </b></font></font>
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</p>
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</td>
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<td width="65%">
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<p><font color="#ffffff"><i>Set Program Counter to Value $<b><font color="#ffff00">FA62</font></b>
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(RESET) </i></font>
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</p>
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</td>
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</tr>
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<tr bgcolor="#000000">
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<td bgcolor="#000000" width="35%">
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<p><font color="#00b8ff"><font face="Courier"><b><span style="BACKGROUND: rgb(0,0,0) 0% 50%; moz-background-clip: initial; moz-background-origin: initial; moz-background-inline-policy: initial">G C600 D000,3000</span></b></font></font></p>
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</td>
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<td bgcolor="#000000" width="65%">
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<p><font color="#ffffff"><i>Single-step until either PC = $C600, or PC <= $D000</i></font></p>
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</td>
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</tr>
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</tbody>
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</table>
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<br>
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</body>
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</html>
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