mu - Soul of a tiny new machine. More thorough tests → More comprehensible and rewrite-friendly software → More resilient society.

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	Commit message (Expand)	Author	Age	Files	Lines
*	5490	Kartik Agaram	2019-07-27	1	-3/+3
*	5485 - promote SubX to top-level	Kartik Agaram	2019-07-27	1	-62/+70
*	4891	Kartik Agaram	2018-12-30	1	-0/+1
*	4890 - new html renderings	Kartik Agaram	2018-12-29	1	-16/+11
*	4814	Kartik Agaram	2018-12-01	1	-31/+35
*	4539	Kartik Agaram	2018-09-07	1	-8/+7
*	4447	Kartik Agaram	2018-07-27	1	-86/+104
*	4239	Kartik Agaram	2018-05-08	1	-7/+7
*	4199	Kartik K. Agaram	2018-01-25	1	-22/+21
*	4162	Kartik K. Agaram	2017-12-22	1	-111/+86
*	4161	Kartik K. Agaram	2017-12-15	1	-8/+8
*	4155	Kartik K. Agaram	2017-12-07	1	-1/+1
*	3971	Kartik K. Agaram	2017-08-19	1	-86/+85
*	3927	Kartik K. Agaram	2017-06-19	1	-2/+2
*	3897 - various updates to documentation	Kartik K. Agaram	2017-05-29	1	-1/+1
*	3764 - better colors for cross-links	Kartik K. Agaram	2017-03-08	1	-4/+5
*	3761	Kartik K. Agaram	2017-03-07	1	-17/+18
*	3750	Kartik K. Agaram	2017-03-02	1	-1/+1
*	3749	Kartik K. Agaram	2017-03-02	1	-2/+2
*	3716	Kartik K. Agaram	2016-12-26	1	-0/+2
*	3713 - cross-link calls with definitions in html	Kartik K. Agaram	2016-12-26	1	-17/+17
*	3710	Kartik K. Agaram	2016-12-26	1	-112/+112
*	3709 - line numbers in html	Kartik K. Agaram	2016-12-26	1	-115/+139
*	3561	Kartik K. Agaram	2016-10-22	1	-1/+1
*	3558	Kartik K. Agaram	2016-10-22	1	-6/+6
*	3544	Kartik K. Agaram	2016-10-22	1	-1/+1
*	3543	Kartik K. Agaram	2016-10-22	1	-3/+2
*	3524	Kartik K. Agaram	2016-10-20	1	-2/+2
*	3433	Kartik K. Agaram	2016-10-01	1	-1/+1
*	3315	Kartik K. Agaram	2016-09-10	1	-4/+6
*	3219	Kartik K. Agaram	2016-08-17	1	-1/+1
*	3174	Kartik K. Agaram	2016-08-12	1	-1/+1
*	3102	Kartik K. Agaram	2016-07-05	1	-1/+1
*	2812	Kartik K. Agaram	2016-03-27	1	-13/+22
*	2744	Kartik K. Agaram	2016-03-09	1	-4/+4
*	2743	Kartik K. Agaram	2016-03-09	1	-39/+31
*	2706 - update html	Kartik K. Agaram	2016-02-25	1	-4/+5
*	2175	Kartik K. Agaram	2015-09-06	1	-1/+1
*	2062	Kartik K. Agaram	2015-08-23	1	-25/+36
*	1949	Kartik K. Agaram	2015-08-06	1	-22/+23
*	1885	Kartik K. Agaram	2015-07-29	1	-22/+21
*	1853	Kartik K. Agaram	2015-07-25	1	-21/+22
*	1690	Kartik K. Agaram	2015-07-01	1	-1/+1
*	1632	Kartik K. Agaram	2015-06-23	1	-1/+1
*	1631 - update html versions	Kartik K. Agaram	2015-06-23	1	-5/+5
*	1556	Kartik K. Agaram	2015-06-12	1	-1/+1
*	1549	Kartik K. Agaram	2015-06-09	1	-2/+2
*	1517	Kartik K. Agaram	2015-05-30	1	-3/+5
*	1461 - descriptions/table of contents for the layers	Kartik K. Agaram	2015-05-26	1	-1/+1
*	1459	Kartik K. Agaram	2015-05-25	1	-6/+8

lass="w"> 1px; } .Comment { color: #9090ff; } .Comment a { color:#0000ee; text-decoration:underline; } .PreProc { color: #800080; } --> </style> <script type='text/javascript'>  </script> </head> <body onload='JumpToLine();'> <pre id='vimCodeElement'> <span id="L1" class="LineNr"> 1 </span><span class="Comment">//: Start allowing us to not specify precise addresses for the start of each</span> <span id="L2" class="LineNr"> 2 </span><span class="Comment">//: segment.</span> <span id="L3" class="LineNr"> 3 </span><span class="Comment">//: This gives up a measure of control in placing code and data.</span> <span id="L4" class="LineNr"> 4 </span> <span id="L5" class="LineNr"> 5 </span><span class="Comment">//: segment address computation requires setting Mem_offset in test mode to what it'll be in run mode</span> <span id="L6" class="LineNr"> 6 </span><span class="Delimiter">:(scenario segment_name)</span> <span id="L7" class="LineNr"> 7 </span><span class="Special">% Mem_offset = CODE_START;</span> <span id="L8" class="LineNr"> 8 </span>== <a href='031check_operands.cc.html#L14'>code</a> <span id="L9" class="LineNr"> 9 </span><span class="PreProc">0</span><span class="Constant">5</span>/add <span class="Constant">0x0d0c0b0a</span>/imm32 <span class="Comment"># add 0x0d0c0b0a to EAX</span> <span id="L10" class="LineNr">10 </span><span class="Comment"># code starts at 0x08048000 + p_offset, which is 0x54 for a single-segment binary</span> <span id="L11" class="LineNr">11 </span><span class="traceContains">+load: 0x08048054 -> 05</span> <span id="L12" class="LineNr">12 </span><span class="traceContains">+load: 0x08048055 -> 0a</span> <span id="L13" class="LineNr">13 </span><span class="traceContains">+load: 0x08048056 -> 0b</span> <span id="L14" class="LineNr">14 </span><span class="traceContains">+load: 0x08048057 -> 0c</span> <span id="L15" class="LineNr">15 </span><span class="traceContains">+load: 0x08048058 -> 0d</span> <span id="L16" class="LineNr">16 </span><span class="traceContains">+run: add imm32 0x0d0c0b0a to <a href='010---vm.cc.html#L23'>reg</a> <a href='010---vm.cc.html#L13'>EAX</a></span> <span id="L17" class="LineNr">17 </span><span class="traceContains">+run: storing 0x0d0c0b0a</span> <span id="L18" class="LineNr">18 </span> <span id="L19" class="LineNr">19 </span><span class="Delimiter">:(before "End Level-2 Transforms")</span> <span id="L20" class="LineNr">20 </span><a href='011run.cc.html#L207'>Transform</a><span class="Delimiter">.</span>push_back<span class="Delimiter">(</span><a href='034compute_segment_address.cc.html#L23'>compute_segment_starts</a><span class="Delimiter">);</span> <span id="L21" class="LineNr">21 </span> <span id="L22" class="LineNr">22 </span><span class="Delimiter">:(code)</span> <span id="L23" class="LineNr">23 </span><span class="Normal">void</span> <a href='034compute_segment_address.cc.html#L23'>compute_segment_starts</a><span class="Delimiter">(</span>program& p<span class="Delimiter">)</span> <span class="Delimiter">{</span> <span id="L24" class="LineNr">24 </span> <a href='003trace.cc.html#L196'>trace</a><span class="Delimiter">(</span><span class="Constant">99</span><span class="Delimiter">,</span> <span class="Constant">"transform"</span><span class="Delimiter">)</span> << <span class="Constant">"-- compute segment addresses"</span> << <a href='003trace.cc.html#L222'>end</a><span class="Delimiter">();</span> <span id="L25" class="LineNr">25 </span> <span class="Normal">uint32_t</span> p_offset = <span class="Comment">/*</span><span class="Comment">size of ehdr</span><span class="Comment">*/</span><span class="Constant">0x34</span> + <a href='001help.cc.html#L157'>SIZE</a><span class="Delimiter">(</span>p<span class="Delimiter">.</span><a href='011run.cc.html#L100'>segments</a><span class="Delimiter">)</span>*<span class="Constant">0x20</span><span class="Comment">/*</span><span class="Comment">size of each phdr</span><span class="Comment">*/</span><span class="Delimiter">;</span> <span id="L26" class="LineNr">26 </span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">size_t</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i < p<span class="Delimiter">.</span><a href='011run.cc.html#L100'>segments</a><span class="Delimiter">.</span>size<span class="Delimiter">();</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span> <span id="L27" class="LineNr">27 </span> segment& curr = p<span class="Delimiter">.</span><a href='011run.cc.html#L100'>segments</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span> <span id="L28" class="LineNr">28 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>curr<span class="Delimiter">.</span><a href='011run.cc.html#L108'>start</a> == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span> <span id="L29" class="LineNr">29 </span> curr<span class="Delimiter">.</span><a href='011run.cc.html#L108'>start</a> = <a href='012elf.cc.html#L126'>CODE_START</a> + i*SEGMENT_SIZE + p_offset<span class="Delimiter">;</span> <span id="L30" class="LineNr">30 </span> <a href='003trace.cc.html#L196'>trace</a><span class="Delimiter">(</span><span class="Constant">99</span><span class="Delimiter">,</span> <span class="Constant">"transform"</span><span class="Delimiter">)</span> << <span class="Constant">"segment "</span> << i << <span class="Constant">" begins at address 0x"</span> << <a href='010---vm.cc.html#L260'>HEXWORD</a> << curr<span class="Delimiter">.</span><a href='011run.cc.html#L108'>start</a> << <a href='003trace.cc.html#L222'>end</a><span class="Delimiter">();</span> <span id="L31" class="LineNr">31 </span> <span class="Delimiter">}</span> <span id="L32" class="LineNr">32 </span> p_offset += <a href='034compute_segment_address.cc.html#L37'>size_of</a><span class="Delimiter">(</span>curr<span class="Delimiter">);</span> <span id="L33" class="LineNr">33 </span> assert<span class="Delimiter">(</span>p_offset < <a href='012elf.cc.html#L127'>SEGMENT_SIZE</a><span class="Delimiter">);</span> <span class="Comment">// for now we get less and less available space in each successive segment</span> <span id="L34" class="LineNr">34 </span> <span class="Delimiter">}</span> <span id="L35" class="LineNr">35 </span><span class="Delimiter">}</span> <span id="L36" class="LineNr">36 </span> <span id="L37" class="LineNr">37 </span><span class="Normal">uint32_t</span> <a href='034compute_segment_address.cc.html#L37'>size_of</a><span class="Delimiter">(</span><span class="Normal">const</span> segment& s<span class="Delimiter">)</span> <span class="Delimiter">{</span> <span id="L38" class="LineNr">38 </span> <span class="Normal">uint32_t</span> sum = <span class="Constant">0</span><span class="Delimiter">;</span> <span id="L39" class="LineNr">39 </span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i < <a href='001help.cc.html#L157'>SIZE</a><span class="Delimiter">(</span>s<span class="Delimiter">.</span><a href='011run.cc.html#L109'>lines</a><span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span id="L40" class="LineNr">40 </span> sum += <a href='034compute_segment_address.cc.html#L45'>num_bytes</a><span class="Delimiter">(</span>s<span class="Delimiter">.</span><a href='011run.cc.html#L109'>lines</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span> <span id="L41" class="LineNr">41 </span> <span class="Identifier">return</span> sum<span class="Delimiter">;</span> <span id="L42" class="LineNr">42 </span><span class="Delimiter">}</span> <span id="L43" class="LineNr">43 </span> <span id="L44" class="LineNr">44 </span><span class="Comment">// Assumes all bitfields are packed.</span> <span id="L45" class="LineNr">45 </span><span class="Normal">uint32_t</span> <a href='034compute_segment_address.cc.html#L45'>num_bytes</a><span class="Delimiter">(</span><span class="Normal">const</span> line& inst<span class="Delimiter">)</span> <span class="Delimiter">{</span> <span id="L46" class="LineNr">46 </span> <span class="Normal">uint32_t</span> sum = <span class="Constant">0</span><span class="Delimiter">;</span> <span id="L47" class="LineNr">47 </span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i < <a href='001help.cc.html#L157'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span><a href='011run.cc.html#L118'>words</a><span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span> <span id="L48" class="LineNr">48 </span> <span class="Normal">const</span> word& curr = inst<span class="Delimiter">.</span><a href='011run.cc.html#L118'>words</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span> <span id="L49" class="LineNr">49 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>has_operand_metadata<span class="Delimiter">(</span>curr<span class="Delimiter">,</span> <span class="Constant">"disp32"</span><span class="Delimiter">)</span> || has_operand_metadata<span class="Delimiter">(</span>curr<span class="Delimiter">,</span> <span class="Constant">"imm32"</span><span class="Delimiter">))</span> <span class="Comment">// only multi-byte operands</span> <span id="L50" class="LineNr">50 </span> sum += <span class="Constant">4</span><span class="Delimiter">;</span> <span id="L51" class="LineNr">51 </span> <span class="Comment">// End num_bytes(curr) Special-cases</span> <span id="L52" class="LineNr">52 </span> <span class="Normal">else</span> <span id="L53" class="LineNr">53 </span> sum++<span class="Delimiter">;</span> <span id="L54" class="LineNr">54 </span> <span class="Delimiter">}</span> <span id="L55" class="LineNr">55 </span> <span class="Identifier">return</span> sum<span class="Delimiter">;</span> <span id="L56" class="LineNr">56 </span><span class="Delimiter">}</span> <span id="L57" class="LineNr">57 </span> <span id="L58" class="LineNr">58 </span><span class="Comment">//: Dependencies:</span> <span id="L59" class="LineNr">59 </span><span class="Comment">//: - We'd like to compute segment addresses before setting up global variables,</span> <span id="L60" class="LineNr">60 </span><span class="Comment">//: because computing addresses for global variables requires knowing where</span> <span id="L61" class="LineNr">61 </span><span class="Comment">//: the data segment starts.</span> <span id="L62" class="LineNr">62 </span><span class="Comment">//: - We'd like to finish expanding labels before computing segment addresses,</span> <span id="L63" class="LineNr">63 </span><span class="Comment">//: because it would make computing the sizes of segments more self-contained</span> <span id="L64" class="LineNr">64 </span><span class="Comment">//: (num_bytes).</span> <span id="L65" class="LineNr">65 </span><span class="Comment">//:</span> <span id="L66" class="LineNr">66 </span><span class="Comment">//: Decision: compute segment addresses before expanding labels, by being</span> <span id="L67" class="LineNr">67 </span><span class="Comment">//: aware in this layer of certain operand types that will eventually occupy</span> <span id="L68" class="LineNr">68 </span><span class="Comment">//: multiple bytes.</span> <span id="L69" class="LineNr">69 </span><span class="Comment">//:</span> <span id="L70" class="LineNr">70 </span><span class="Comment">//: The layer to expand labels later hooks into num_bytes() to teach this</span> <span id="L71" class="LineNr">71 </span><span class="Comment">//: layer that labels occupy zero space in the binary.</span> </pre> </body> </html>