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From: Artyom Tarasenko <atar4qemu@gmail.com>
Date: Fri, 5 Nov 2010 18:48:36 +0100
Message-ID: <AANLkTi=Ray-YKCbGNg0QWY1-J3Ahqf=ohCRQANFype9u@mail.gmail.com>
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Subject: [Qemu-devel] [sparc] Unassigned mem read access on writing?
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To: qemu-devel <qemu-devel@nongnu.org>, Blue Swirl <blauwirbel@gmail.com>

Trying to boot Solaris 2.1 I get the following error message:

Unassigned mem read access of 1 byte to ffffffffffff0768 from f0014768
qemu: fatal: Trap 0x29 while interrupts disabled, Error state
pc: f0014768  npc: f001476c

Looks like a read access to a non-mapped memory (the NF-bit is 0). But
where can it happen?

The code:

   0xf001475c:  mov  0x200, %o4
=> 0xf0014760:  lda  [ %o4 ] #ASI_N, %o3
   0xf0014764:  sta  %o2, [ %o4 ] #ASI_N
   0xf0014768:  sta  %g0, [ %o0 ] (3)
   0xf001476c:  cmp  %o2, %o3
   0xf0014770:  bne  0xf001477c
End of assembler dump.
(gdb) stepi
0xf0014764 in ?? ()
(gdb) info registers o2
o2             0x28a    650
(gdb) stepi
Remote connection closed
(gdb)

Any ideas how to debug?

-- 
Regards,
Artyom Tarasenko

solaris/sparc under qemu blog: http://tyom.blogspot.com/