Messages in this thread | | | Date | Sat, 6 Apr 2002 19:17:15 +0300 (EEST) | From | halfdead <> | Subject | 2.4.x kernels vs. IDT |
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hey all! with the risk of being annoying i post again this message because i am not sure the last i did found its way to the list due to some unknown delays in majordomo`s subscribing procedure. so, here it is my problem in detail: i experience a weird IDT issue on kernels 2.4.x. what i want to do is finding the address of a certain IDT gate but when i try to read memory from ring0 at that location it segfaults. the code is in assembler.
.bss idtr: .double .text
get_gate: movl $0x80, %eax sidt idtr movl idtr+2, %ebx leal (%ebx, %eax, 8), %ebx movw (%ebx), %cx <- segfault
as far as i know, i retrieve the correct IDT base, but after the leal instruction, %ebx has some unusual value. i suspect that either leal instruction is misimplemented in gcc/as compilers or the kernel doesn`t give me the right IDT. anyway, it could also be some obscure coding error but i strongly doubt it. i cannot find out why is this happening.. i would apreciate any help that i can get.
best regards, halfdead
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