COMP 3430 – Operating Systems
Segmentation part 2
April 6th, 2022
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By the end of today’s lecture, you should be able to:
▶ Describe the concept of segmentation.
▶ List the limits of segmentation.
▶ Describe what happens when you see the
words “Segmentation fault”.
The Woggle-Bug Book (Public Domain)
Segmentation
▶ Allocating full address spaces
▶ Logically separate address spaces into
▶ Allocate only as much of the segment as
is necessary.
▶ Let’s draw some pictures .
Who does that?
wat. (Pixabay License)
Segmentation fault Accessing an address that’s past the bounds of the
allocated segment.
Discuss with your team: Who or what prints out the words “Segmentation fault”?
▶ Your program.
▶ The standard library (e.g., Glibc, musl). ▶ The shell.
▶ The hardware.
Can we catch SIGSEGV?
Let’s write/look at some code.
▶ Segmentation segments address spaces.
▶ “Heap”, “code”, “stack” are put into these segments.
▶ Different parts of the system have different responsibilities related to segmentation faults.
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