Changed layout for more manageable volumes

1 files changed, 0 insertions, 294 deletions

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-#LyX 2.4 created this file. For more info see https://www.lyx.org/
-\lyxformat 620
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-\begin_layout Standard
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-status open
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-\begin_layout Plain Layout
-TODO 3,
- 4,
- 7 (1p,
- 1:09)
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-
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-
-
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-
-
-\backslash
-exerc3[10]
-\end_layout
-
-\end_inset
-
-The previous exercise suggests having the trace program write its output onto tape.
- Discuss why this would be preferable to printing it directly.
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-
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-
-
-\backslash
-answer 
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-
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-
-The output of the tracer would be large,
- and so it would need to be analyzed by another program in order to focus on interesting parts or gather some statistics.
-\end_layout
-
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-status open
-
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-
-
-\backslash
-rexerc4[25]
-\end_layout
-
-\end_inset
-
-What would happen if the trace routine were tracing 
-\emph on
-itself
-\emph default
-?
- Specifically,
- consider the behavior if the two instructions 
-\family typewriter
-ENTX LEAVEX
-\family default
-;
- 
-\family typewriter
-JMP *+1
-\family default
- were placed just before 
-\family typewriter
-ENTER
-\family default
-.
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-
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-
-
-\backslash
-answer 
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-
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-
-Unfortunately this wouldn't work,
- as the registers A and J of the tracing tracing program and the traced traced program would be stored in the same addresses.
-\end_layout
-
-\begin_layout Standard
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-
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-
-
-\backslash
-rexerc7[25]
-\end_layout
-
-\end_inset
-
-Discuss how to write an efficient 
-\emph on
-jump trace
-\emph default
- routine,
- which emits much less output than a normal trace.
- Instead of displaying the register contents,
- a jump trace simply records the jumps that occur.
- It outputs a sequence of pairs 
-\begin_inset Formula $(x_{1},y_{1}),(x_{2},y_{2}),\dots$
-\end_inset
-
-,
- meaning that the program jumped from location 
-\begin_inset Formula $x_{1}$
-\end_inset
-
- to 
-\begin_inset Formula $y_{1}$
-\end_inset
-
-,
- then (after performing the instructions in locations 
-\begin_inset Formula $y_{1},y_{1}+1,\dots,x_{2}$
-\end_inset
-
-) it jumped from 
-\begin_inset Formula $x_{2}$
-\end_inset
-
- to 
-\begin_inset Formula $y_{2}$
-\end_inset
-
-,
- etc.
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-
-
-\backslash
-answer 
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-
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-
-We could save this information right at the 
-\family typewriter
-JUMP
-\family default
- label.
- At this point,
- 
-\family typewriter
-PREG
-\family default
- contains the current instruction and 
-\family typewriter
-INST1
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- contains the instruction to jump to,
- so it should be easy to move those to values to a buffer and call a subroutine to write to tape when the buffer is full.
-\end_layout
-
-\begin_layout Standard
-If the code wasn't self-modifying,
- we could just scan up to the next jump instruction,
- modify that one,
- and run up to that point,
- and the solution from the book specifies just that except that it allows 
-\family typewriter
-STJ
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- to modify jump calls by handling this case separately during the scan.
- Since modern processors can raise an exception when modifying their own code (W^X),
- it should be possible to save all the jump calls in some table and substitute them by calls to a debugger routine before running,
- accepting that the program may detect that it's being debugged by looking at its own jump calls.
-\end_layout
-
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