exception after `call far TSS descriptor:offset`

Question

I have a big problem that's got me stuck for a month! I'm writing assembly code to do a task switch by call far [es:esi + TCB.addr_tss] in bochs, like picture 1. enter image description here

Now I step into the new task, so I type 's' in bochs, like picture 2: enter image description here

For now, everything seems OK, the general registers CS, SS, the cotrol registers CR0, CR3, the LDT is OK too. But do you know what will happen if I step again? See picture below: enter image description here

What's wrong?! I have no idea. I examined DPL, segment limitation, and nothing seems wrong. Oh, god bless me...

The preparation is redundant, the code after context switching by TSS is just a `mov eax, eax`. — user2431141, Jun 07 '13 at 13:53

score 0 · Answer 1 · answered Jun 18 '13 at 15:09

0

That's a big irony, I forget to set access permission to PDE.

answered Jun 18 '13 at 15:09

user2431141

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exception after `call far TSS descriptor:offset`

1 Answers1