Questions about call gates

amiu888 · Post time: 2020-2-9 06:00:01

There are GDT and LDT in the system. For a task, it can store up to 16k items.
The call gate is stored in GDT or LDT. A call gate item corresponds to a function code segment. If there are more than 16k function calls in a task, and the functions are different. So how can GDT / LDT drop all call gate entries?

What is wrong with the above understanding, please advise.

xsteel · Post time: 2020-4-13 15:00:02

Save the original, write the new one, and then restore

xsteel · Post time: 2020-4-13 16:30:01

Save the original, replace the new gate

xsteel · Post time: 2020-4-14 17:45:02

Save the original and replace the gate

amiu888 · Post time: 2020-5-6 23:15:02

Can the one upstairs be more detailed? Is there evidence or information cited?

xymu888 · Post time: 2020-8-27 12:00:01

Each task has an LDT, and the operating system rewrites the value of LDTR to point to the LDT of a different task.

May be misunderstood, personal understanding.

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