sti and exception

[lukasz1235]

Hi
I have a little problem. After I enable hardware interrupts on Bochs, I get once exception no. 13. On Qemu and VirtualBox is OK. My code: http://los.svn.sourceforge.net/viewvc/los/trunk/

[egos]

Mask all unused interrupts and set dummy handlers for them.

[Combuster]

How on earth do you get an exception?

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console.cpp:21:18: error: cstdio: No such file or directory
console.cpp: In function 'void Console::kprintf(const char*, ...)':
console.cpp:134: error: 'va_list' was not declared in this scope
console.cpp:134: error: expected ';' before 'args'
console.cpp:137: error: 'args' was not declared in this scope
console.cpp:137: error: 'va_start' was not declared in this scope
console.cpp:138: error: 'vsnprintf' was not declared in this scope
console.cpp:139: error: 'va_end' was not declared in this scope

[lukasz1235]

You mean the IMR? But it is register of PIC, and I use APIC.

@Combuster: Now is OK.

[Combuster]

Next tip: read error messages

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00123347958e[CPU0 ] read_virtual_dqword_aligned_64(): #GP misaligned access
00123347958e[CPU0 ] interrupt(long mode): IDT entry extended attributes DWORD4 TYPE != 0
(...)
00123347958i[CPU0 ] 0x0000008000001187>> movdqa xmm0, dqword ptr ds:[rdx] : 660F6F02

[lukasz1235]

I change movdqa to movdqu and it not solve the problem.

[Combuster]

Of course not. Bochs said there were at least two problems. (Actually, there's a third: your build system drags in glibc by default)

[lukasz1235]

From Bochs source:

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  if (desctmp2 & BX_CONST64(0x00001F0000000000)) {
    BX_ERROR(("interrupt(long mode): IDT entry extended attributes DWORD4 TYPE != 0"));
    exception(BX_GP_EXCEPTION, vector*8 + 2);
  }

. Example IDT descriptor:
7B 1E 08 00 00 8E 00 00 80 00 00 00 00 00 00 00

desctmp2 = 0x8000000000000000

0x8000000000000000 & 0x00001F0000000000 = 0

So I don't understand where is the bug.

As regards the third: Where?