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From: Peter Maydell <peter.maydell@linaro.org>
To: qemu-devel@nongnu.org
Subject: [Qemu-devel] [Bug 1838475] Re: qemu-system-arm exits when cortex-m4 floating point used and irq occurs
Date: Fri, 02 Aug 2019 16:38:53 -0000	[thread overview]
Message-ID: <156476393401.25402.11459506417891552986.malone@soybean.canonical.com> (raw)
In-Reply-To: 156452233283.15483.3370838341008169030.malonedeb@wampee.canonical.com

Now fixed in git master; will be in the imminent 4.1 release.


** Changed in: qemu
       Status: In Progress => Fix Committed

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https://bugs.launchpad.net/bugs/1838475

Title:
  qemu-system-arm exits when cortex-m4 floating point used and irq
  occurs

Status in QEMU:
  Fix Committed

Bug description:
  qemu-system-arm exits with

  "...Secure UsageFault with CFSR.NOCP because NSACR.CP10 prevents stacking FP regs
  ...taking pending nonsecure exception 3
  Taking exception 7 [Breakpoint]
  qemu: fatal: Lockup: can't escalate 3 to HardFault (current priority -1)" 

  when emulating Cortex-m4, executing at least 1 floating point
  instruction, and then an irq (e.g. sys tick) occurring.

  CPACR.CP10 and CPACR.CP11 are set to 0x3 respectively prior to
  executing the fp instructions.

  NOTE: NSACR does not appear to be a cortex m4 register.

  Attached is a simplified elf to repro the issue.

  The qemu command line is: "qemu-system-arm --gdb tcp::1234 -cpu
  cortex-m4 -machine lm3s6965evb -nographic -semihosting-config
  enable=on,target=native -kernel QemuExitWhenUsingFPAndIRQOccurs.elf -d
  int"

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  parent reply	other threads:[~2019-08-02 16:46 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-30 21:32 [Qemu-devel] [Bug 1838475] [NEW] qemu-system-arm exits when cortex-m4 floating point used and irq occurs KD
2019-07-31  9:20 ` [Qemu-devel] [Bug 1838475] " Alex Bennée
2019-08-01 11:00 ` Peter Maydell
2019-08-01 16:43 ` KD
2019-08-02 16:38 ` Peter Maydell [this message]
2019-08-16  4:50 ` Thomas Huth

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