This bug was fixed in the package qemu - 2.1+dfsg-7ubuntu3
---------------
qemu (2.1+dfsg-7ubuntu3) vivid; urgency=medium
* d/p/target-arm-A64-Break-out-aarch64_save-restore_sp.patch
d/p/target-arm-A64-Respect-SPSEL-in-ERET-SP-restore.patch
d/p/target-arm-A64-Respect-SPSEL-when-taking-exceptions.patch:
Cherry-pick of upstream patches in order to fix AArch64 emulation ignoring
SPSel=0 in certain conditions. (LP: #1349277)
-- Chris J Arges <chris.j.ar...@canonical.com> Thu, 04 Dec 2014 14:17:01
-0600
** Changed in: qemu (Ubuntu)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1349277
Title:
AArch64 emulation ignores SPSel=0 when taking (or returning from) an
exception at EL1 or greater
Status in QEMU:
Fix Committed
Status in qemu package in Ubuntu:
Fix Released
Bug description:
The AArch64 emulation ignores SPSel=0 when:
(1) taking an interrupt from an exception level greater than EL0
(e.g., EL1t),
(2) returning from an exception (via ERET) to an exception level
greater than EL0 (e.g., EL1t), with SPSR_ELx[SPSel]=0.
The attached patch fixes the problem in my application.
Background:
I'm running a standalone application (toy OS) that is performing
preemptive multithreading between threads running at EL1t, with
exception handling / context switching occurring at EL1h. This bug
causes the stack pointer to be corrupted in the threads running at
EL1t (they end up with a version of the EL1h stack pointer (SP_EL1)).
Occurs in:
qemu-2.1.0-rc1 (found in)
commit c60a57ff497667780132a3fcdc1500c83af5d5c0 (current master)
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