From: "Andrew Wilcox" <andrew.r.wilcox@gmail.com>
To: qemu-devel@nongnu.org
Subject: [Qemu-devel] Qemu 0.8.0 and latest CVS - invalid opcode doing ljmp to set CS
Date: Mon, 20 Nov 2006 00:10:16 -0500 [thread overview]
Message-ID: <f90da9000611192110u25fbd020v22488ba5d8c6ebb1@mail.gmail.com> (raw)
Hello,
My kernel crashes in Qemu with this error:
An exception 06 (Invalid Opcode) with error code 0 has occurred in the
AWOS kernel (0008:0000004C).
the disassembly of the relevant section:
00100039 <gdt_flush>:
100039: 0f 01 15 60 d0 10 00 lgdtl 0x10d060
100040: 66 b8 10 00 mov $0x10,%ax
100044: 8e d8 movl %eax,%ds
100046: 8e c0 movl %eax,%es
100048: 8e e0 movl %eax,%fs
10004a: 8e e8 movl %eax,%gs
10004c: ea 53 00 10 00 08 00 ljmp $0x8,$0x100053
100053: c3 ret
Qemu's disassembly (via log in_asm):
0x00000039: out %eax,(%dx)
0x0000003a: add %dh,%al
0x0000003c: push %ebx
0x0000003d: incl (%eax)
0x0000003f: lock adc %al,0xf84dc000(%ebx)
0x00000046: add %dh,%al
0x00000048: inc %ecx
0x00000049: clc
0x0000004a: add %dh,%al
0x0000004c: (bad)
0x0000004d: jecxz 0x4f
I can boot the kernel on a normal computer, an IBM Aptiva with a
Pentium 166MHz MMX processor, without this error.
Is there a special way to compile the kernel, or maybe something I
missed? You may look at the source at:
http://awos.sourceforge.net/nightly
The computer I am attempting to run Qemu on:
Mobile Intel(R) Celeron(R) Processor (NetBurst) 1.60GHz
487MB RAM (16MB shared Video RAM)
Ubuntu Dapper Drake 6.06.1 LTS
Linux Lappy 2.6.15-27-386 #1 PREEMPT Sat Sep 16 01:51:59 UTC 2006 i686 GNU/Linux
Tested with 0.8.0, 0.8.2-release and snapshot-2006-11-18. All exhibit
the same problem.
I did try and Google "Qemu invalid opcode ljmp" and "Qemu invalid
instruction ljmp" and "Qemu #UD ljmp" to no avail.
I also saw this message which seems fairly similar to my problem with
no replies: http://lists.gnu.org/archive/html/qemu-devel/2006-03/msg00022.html
Thank you for your attention.
Andrew
reply other threads:[~2006-11-20 5:10 UTC|newest]
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