Questions about call gates

amiu888

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

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

xsteel

Save the original, replace the new gate

xsteel

Save the original and replace the gate

amiu888

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

xymu888

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.