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<title>Execution commands of μCsim</title>
</head>
<body bgcolor="white">
<h2>Execution commands of <i>μCsim</i></h2>
<a name="run">
<h3>r,run,go [start [stop]]</h3>
</a> This command starts the execution of the simulated program.
<p>Parameters are optional. First parameter specifies start address of the
execution. By default execution starts at address specified by actual
value of the PC. This can be overridden by first parameter. </p>
<p>If second parameter is specified it places a dynamic breakpoint at
specified address which stops the execution. If stop address is not given
the simulator stops if it reaches a breakpoint, or the CPU accepts an
interrupt and <b>stopit</b> option is TRUE, or fatal error occurs or <a
href="#stop">stop</a> command is used on an other console, or ENTER key
is pressed on the console where the run command was issued. </p>
<p>If program execution is started the console is <i>frozen</i> it is not
possible to give commands on this console to the simulator while execution
is running. If it is needed to control the simulator during program
execution then more consoles can be used. See using <a href="mulcons.html">multiple
consoles</a> for more information. </p>
<p>Note that first instruction is executed without effect of breakpoints and
simulation will be started afterwards. It means that if there is a
breakpoint at start address then it will not be hit. See following
example: </p>
<pre>$ <font color="#118811">./ucsim_51</font>
ucsim 0.2.38-pre1, Copyright (C) 1997 Daniel Drotos, Talker Bt.
ucsim comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
> <font color="#118811">b 0x10</font>
Breakpoint 1 at 0x000010: MOV R7,A
> <font color="#118811">b 0x20</font>
Breakpoint 2 at 0x000020: MOV R7,A
> <font color="#118811">run 0x10</font>
Warning: maybe not instruction at 0x000010
Simulation started, PC=0x000010
Stop at 0x000020: (104) Breakpoint
F 0x000020
>
</pre>
<hr> <a name="stop">
<h3>stop</h3>
</a> This command stops the simulation, it freezes the CPU and all the
peripherals.
<pre>$ <font color="#118811">ucsim_51 remoansi.hex</font>
ucsim 0.2.24, Copyright (C) 1997 Daniel Drotos, Talker Bt.
ucsim comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
58659 bytes read from remoansi.hex
> <font color="#118811">g</font>
Simulation started
> <font color="#118811">dr</font>
000000 00 01 00 14 00 00 5a 47 ......ZG
000000 00 . ACC= 0x47 71 G B= 0x01 DPTR= 0x001c @DPTR= 0x47 71 G
000001 01 . PSW= 0x00 CY=0 AC=0 OV=0 P=0
006f02 90 00 1e MOV DPTR,#001e
> <font color="#118811">stop</font>
006ac5 24 a5 ADD A,#a5
>
</pre> Simulated program is executed in background and the simulator accepts
commands. If it stopped by the stop command the instruction pointed by PC is
disassembled, see the <a href="#dis"><b>dis</b></a> command for description
of disassembled form.
<hr> <a name="step">
<h3>s,step [steps]</h3>
</a> Step command. It executes one instruction without effect of
breakpoints.
<p>The optional parameter can be used to specify number of instructions to
execute. Note that breakpoints will stop the execution after the first
instruction. </p>
<pre>$ <font color="#118811">ucsim_51 remoansi.hex</font>
ucsim 0.2.12, Copyright (C) 1997 Daniel Drotos, Talker Bt.
ucsim comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
58659 bytes read from remoansi.hex
> <font color="#118811">s</font>
000000 00 00 00 00 00 00 00 00 ........
000000 00 . ACC= 0x00 0 . B= 0x00 DPTR= 0x0000 @DPTR= 0x00 0 .
000000 00 . PSW= 0x00 CY=0 AC=0 OV=0 P=0
000160 c2 90 CLR P1.0
> </pre>
<p> After execution of actual instruction pointed by PC (or all instructions
specified by the optional parameter) the <b>step</b> command dumps out
the register set.</p>
<p>Number of steps can be specified in different units. If no unit is
appended to step number then it will be interpreted as number of
instruction. Other know units are:</p>
<dl>
<dt> s, sec</dt>
<dd>Simulated execution time in seconds.</dd>
<dt>ms, msec</dt>
<dd>Simulated execution time in milliseconds.</dd>
<dt>us, usec</dt>
<dd>Simulated execution time in microseconds.</dd>
<dt>ns, nsec</dt>
<dd>Simulated execution time in nanoseconds.</dd>
<dt>vclk</dt>
<dd>Number of virtual clock counts.</dd>
<dt>fclk, fetch</dt>
<dd>Number of fetches.</dd>
<dt>rclk, read</dt>
<dd>Number of memory read operations.</dd>
<dt>wclk, write</dt>
<dd>Number of memory write operations.</dd>
</dl>
<br>
<hr> <a name="n">
<h3>n,next</h3>
</a> Execute until next instruction is reached. This command is similar to <a
href="#s"><b>step</b></a> command described above but if actual
instruction to execute is a subroutine call the <b>next</b> command places
a dynamic breakpoint after the call instruction and starts to execute the
subroutine. If the subroutine is infinite the breakpoint set by <b>next</b>
will never reached. It can be a dangerous situation because the execution
started by the <b>next</b> command can not be stopped interactively. But it
can be stopped by other breakpoints.
<pre>$ <font color="#118811">ucsim_51 remoansi.hex</font>
ucsim 0.2.12, Copyright (C) 1997 Daniel Drotos, Talker Bt.
ucsim comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
58659 bytes read from remoansi.hex
> <font color="#118811">run 0 0x172</font>
000172 79 04 MOV R1,#04
> <font color="#118811">dis 0x172 0 5</font>
000170 7f 00 MOV R7,#00
000172 79 04 MOV R1,#04
000174 12 0d b8 LCALL 0db8
000177 0f INC R7
000178 d9 fa DJNZ R1,0174
00017a 75 0b 00 MOV 0b,#00
> <font color="#118811">n</font>
000000 00 04 00 00 00 00 00 00 ........
000000 00 . ACC= 0x00 0 . B= 0x00 DPTR= 0x0000 @DPTR= 0x00 0 .
000004 00 . PSW= 0x00 CY=0 AC=0 OV=0 P=0
000174 12 0d b8 LCALL 0db8
> <font color="#118811">n</font>
000000 00 04 00 00 00 00 00 00 ........
000000 00 . ACC= 0x00 0 . B= 0x00 DPTR= 0x0167 @DPTR= 0x00 0 .
000004 00 . PSW= 0x00 CY=0 AC=0 OV=0 P=0
000177 0f INC R7
> </pre>
<hr> <a name="pc">
<h3>pc [address]</h3>
</a> Using this command without any parameter it simply dumps out
instruction pointed by the PC. Specify address if you want to set the PC.
<pre>$ ucsim_51
S51 0.1.5, Copyright (C) 1997 Daniel Drotos, Talker Bt.
S51 comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
> <font color="#118811">pc</font>
* 000000 ff MOV R7,A
> <font color="#118811">pc 123</font>
* 00007b ff MOV R7,A
> <font color="#118811">sopt debug t </font>
> <font color="#118811">pc 32</font>
Warning: maybe not instruction at 000020
* 000020 ff MOV R7,A
> </pre>
<hr>
<h3><a name="history">history</a></h3>
History command can be used to inspect and manipulate history of executed
instructions. It accepts following subcommands:
<p><a href="#history_">history</a> <br>
history <a href="#history_information">information</a> <br>
history <a href="#history_list">list</a> <br>
history <a href="#history_clear">clear</a> </p>
<blockquote>
<h4><a name="history_">history</a></h4>
This command (without a subcommand) prints out last 10 elements of the
command history in disassembled form.
<pre>0> <font color="#118811">hist</font>
? 0x0211 78 LD A,B
? 0x0212 de 22 SBC A,#0x22
? 0x0214 38 f7 JR C,#-9
? 0x0216 c9 RET
? 0x0109 c3 04 02 JP #0x0204
? 0x0204 3e 00 LD A,#0x00
? 0x0206 cf RST 8
? 0x0008 fb EI
? 0x0009 ed 4d RETI
? 0x0207 76 HALT
0>
</pre>
<hr>
<h4><a name="history_information">history information</a></h4>
Print out information about execution history.
<pre>0> <font color="#118811">hist info</font>
len: 100
used: 100
insts: 100
0>
</pre>
<b>Len</b> is size of the history, <b>used</b> shows how many slots are
filled, <b>insts</b> is number of the instructions recorded by the
history.
<hr>
<h4><a name="history_list">history list [nr]</a> <br>
history print [nr]</h4>
This command is the same as the <a href="#history_">history</a> command
but it accepts a parameter which specifies how many records to print
(defaults to 10):
<pre>0> <font color="#118811">hist list 3</font>
? 0x0008 fb EI
? 0x0009 ed 4d RETI
? 0x0207 76 HALT
0> <font color="#118811">hist list 30</font>
? 0x020e 79 LD A,C
? 0x020f d6 33 sub #0x33
? 0x0211 78 LD A,B
? 0x0212 de 22 SBC A,#0x22
? 0x0214 38 f7 JR C,#-9
? 0x020d 03 INC BC
? 0x020e 79 LD A,C
? 0x020f d6 33 sub #0x33
? 0x0211 78 LD A,B
? 0x0212 de 22 SBC A,#0x22
? 0x0214 38 f7 JR C,#-9
? 0x020d 03 INC BC
? 0x020e 79 LD A,C
? 0x020f d6 33 sub #0x33
? 0x0211 78 LD A,B
? 0x0212 de 22 SBC A,#0x22
? 0x0214 38 f7 JR C,#-9
? 0x020d 03 INC BC
? 0x020e 79 LD A,C
? 0x020f d6 33 sub #0x33
? 0x0211 78 LD A,B
? 0x0212 de 22 SBC A,#0x22
? 0x0214 38 f7 JR C,#-9
? 0x0216 c9 RET
? 0x0109 c3 04 02 JP #0x0204
? 0x0204 3e 00 LD A,#0x00
? 0x0206 cf RST 8
? 0x0008 fb EI
? 0x0009 ed 4d RETI
? 0x0207 76 HALT
0>
</pre>
<hr>
<h4><a name="history_clear">history clear</a></h4>
This command clears the history, it deletes all recorded elements.
<pre>0> <font color="#118811">hist list 3</font>
? 0x0008 fb EI
? 0x0009 ed 4d RETI
? 0x0207 76 HALT
0> <font color="#118811">hist clear</font>
0> <font color="#118811">hist info</font>
len: 100
used: 0
insts: 0
0>
</pre>
</blockquote>
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