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[Qemu-devel] [Bug 1349277] Re: AArch64 emulation ignores SPSel=0 when ta
From: |
Ubuntu Foundations Team Bug Bot |
Subject: |
[Qemu-devel] [Bug 1349277] Re: AArch64 emulation ignores SPSel=0 when taking (or returning from) an exception at EL1 or greater |
Date: |
Thu, 04 Dec 2014 20:21:12 -0000 |
The attachment "Proposed fix" seems to be a patch. If it isn't, please
remove the "patch" flag from the attachment, remove the "patch" tag, and
if you are a member of the ~ubuntu-reviewers, unsubscribe the team.
[This is an automated message performed by a Launchpad user owned by
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** Tags added: patch
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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:
New
Status in qemu package in Ubuntu:
In Progress
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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