For a C function switcher with the general structure gcc generates the assembly code and jump table

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For a C function switcher with the general structure

void switcher (long a, long b, long c, long *dest) { } long val; switch (a) { case case val = break; case

gcc generates the assembly code and jump table shown in Figure 3.24.

Fill in the missing parts of the C code. Except for the ordering of case labels C and D, there is only one way to fit the different cases into the template.

Figure 3.24

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Computer Systems A Programmers Perspective

ISBN: 9781292101767

3rd Global Edition

Authors: Randal E. Bryant, David R. O'Hallaron

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Question Posted: Nov 06, 2023 10:52 AM

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For a C function switcher with the general structure gcc generates the assembly code and jump table

Question:

void switcher (long a, long b, long c, long *dest) { } long val; switch (a) { case case val = break; case case C = /* Fall through */ val = break; case val = break; default: val= /* Case A */ } *dest = val; /* Case B */ /* Case C */ /* Case D */ /* Case E */

Step by Step Answer:

The key to reverse engineering compiled switch statements is to combine the ...View the full answer

Computer Systems A Programmers Perspective

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void switcher (long a, long b, long c, long dest) { } long val; switch (a) { case case val = break; case case C = / Fall through / val = break; case val = break; default: val= / Case A / } dest = val; /* Case B / / Case C / / Case D / / Case E */