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> OS Construction > Problem with loading ELF header |
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Szustarol 06 Mar 2017, 19:04
Hi!
I somehow encounter a triple fault when loading ELF header Code of my second stage bootloader is here: https://github.com/cuaox/RIOS/blob/master/BOOTLOADER/stage2.asm with jmp $ i have noticed that if i place it before the loop directive it is not crashing, so why is the loop .loadloop triple faulting my OS? Thanks for any help |
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06 Mar 2017, 19:04 |
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revolution 07 Mar 2017, 02:12
You have altered rcx within the loop with this line:
Code: mov rcx, r10 |
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07 Mar 2017, 02:12 |
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Szustarol 07 Mar 2017, 15:44
Okay but before I do this, I do
mov r15, rcx and then I mov rcx, r15 so its value should be restored, shouldn't it? |
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07 Mar 2017, 15:44 |
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Szustarol 07 Mar 2017, 20:00
So i have updated my repo.
I am sure it crashes at loop rcx is fffffffffffffffe hex when the loop jumps so i guess thats the problem any ideas? I have no idea why the rcx is loaded wrongly can you take a look at my makefile? I dont think elf is malformed |
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07 Mar 2017, 20:00 |
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alkap 08 Mar 2017, 10:00
Not sure this is it, but I've noticed that your offsets are all 8 bytes except for the mov r10. is that by design, or an oversight?
Code: mov r8, [rsi + 8] mov r9, [rsi + 0x10] mov r10, [rsi + 0x20] ; 16-byte offset mov r11, [rsi + 0x28] |
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08 Mar 2017, 10:00 |
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