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[Qemu-devel] [Bug 1359930] Re: [ARMv5] Integrator/CP regression when rea
From: |
Jakub Jermar |
Subject: |
[Qemu-devel] [Bug 1359930] Re: [ARMv5] Integrator/CP regression when reading FPSID register |
Date: |
Fri, 22 Aug 2014 15:56:14 -0000 |
Yes, the patch fixes the problem for me. Thank you.
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https://bugs.launchpad.net/bugs/1359930
Title:
[ARMv5] Integrator/CP regression when reading FPSID register
Status in Home for various HelenOS development branches:
New
Status in QEMU:
New
Bug description:
There seems to be a regression in QEMU 2.1.0 which demonstrates itself
when running the attached HelenOS Integrator/CP (i.e. ARMv5) image. The
offending instruction seems to be:
vmrs r0, fpsid
Upon its execution, HelenOS kernel receives an Undefined instruction
exception (which it does not anticipate at that point) and crashes.
QEMU 2.0.0 was not affected by this issue.
Command line to reproduce with QEMU 2.1.0:
$ qemu-system-arm -M integratorcp -kernel image.boot -s -S &
$ /usr/local/cross/arm32/bin/arm-linux-gnueabi-gdb
...
(gdb) target remote localhost:1234
Remote debugging using localhost:1234
warning: Can not parse XML target description; XML support was disabled at
compile time
0x00000000 in ?? ()
(gdb) symbol-file kernel/kernel.raw
Reading symbols from
/home/jermar/software/HelenOS.mainline/kernel/kernel.raw...done.
(gdb) break ras_check
Breakpoint 1 at 0x80a021bc: file arch/arm32/src/ras.c, line 67.
(gdb) c
Continuing.
Breakpoint 1, ras_check (n=1, istate=0x813e7f70) at arch/arm32/src/ras.c:67
67 {
(gdb) set radix 16
Input and output radices now set to decimal 16, hex 10, octal 20.
(gdb) print istate->pc
$1 = 0x80a02458
(gdb) disassemble 0x80a02458
Dump of assembler code for function fpsid_read:
0x80a02454 <+0>: vmrs r0, fpsid <=======
UNDEFINED EXCEPTION INSTRUCTION
0x80a02458 <+4>: mov pc, lr
End of assembler dump.
The Undefined instruction exception is not expected at this point when
executing the VMRS r0,fpsid instruction.
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- [Qemu-devel] [PATCH v3 00/10] qcow2: Fix image repairing, Max Reitz, 2014/08/22
- [Qemu-devel] [PATCH v3 01/10] qcow2: Fix leaks in dirty images, Max Reitz, 2014/08/22
- [Qemu-devel] [PATCH v3 02/10] qcow2: Split qcow2_check_refcounts(), Max Reitz, 2014/08/22
- [Qemu-devel] [PATCH v3 03/10] qcow2: Pull check_refblocks() up, Max Reitz, 2014/08/22
- [Qemu-devel] [PATCH v3 04/10] qcow2: Reuse refcount table in calculate_refcounts(), Max Reitz, 2014/08/22
- [Qemu-devel] [PATCH v3 05/10] qcow2: Fix refcount blocks beyond image end, Max Reitz, 2014/08/22