[Qemu-devel] [Bug 1328996] [NEW] [AArch64] - blr x30 is handled incorrectly

[Qemu-devel] [Bug 1328996] [NEW] [AArch64] - blr x30 is handled incorrectly

[Sanjin Sijaric]

Public bug reported:

Whenever x30 is used as the operand for blr, the result will be
incorrect.  There is no restriction on using x30 (LR) with the blr
instruction in the ARMv8 manual.  There are two statically linked 64-bit
executables in files.tar.gz: good and bad.  The executable "good" uses
"blr x9", and the output is what is expected: "func".  The executable
"bad" uses "blr x30" and nothing is printed out.  It prints "func" on
the actual device.

** Affects: qemu
     Importance: Undecided
         Status: New

** Attachment added: "files.tar.gz"
   https://bugs.launchpad.net/bugs/1328996/+attachment/4129793/+files/files.tar.gz

** Summary changed:

- [AArch64] - blr x30 is incorrectly handled
+ [AArch64] - blr x30 is handled incorrectly

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Title:
  [AArch64] - blr x30 is handled incorrectly

Status in QEMU:
  New

Bug description:
  Whenever x30 is used as the operand for blr, the result will be
  incorrect.  There is no restriction on using x30 (LR) with the blr
  instruction in the ARMv8 manual.  There are two statically linked
  64-bit executables in files.tar.gz: good and bad.  The executable
  "good" uses "blr x9", and the output is what is expected: "func".  The
  executable "bad" uses "blr x30" and nothing is printed out.  It prints
  "func" on the actual device.

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[Qemu-devel] [Bug 1328996] Re: [AArch64] - blr x30 is handled incorrectly

[Peter Maydell]

I think this should already be fixed in master by commit 1b505f93bcf60
(about a month ago). Can you try a newer QEMU build, please?

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https://bugs.launchpad.net/bugs/1328996

Title:
  [AArch64] - blr x30 is handled incorrectly

Status in QEMU:
  New

Bug description:
  Whenever x30 is used as the operand for blr, the result will be
  incorrect.  There is no restriction on using x30 (LR) with the blr
  instruction in the ARMv8 manual.  There are two statically linked
  64-bit executables in files.tar.gz: good and bad.  The executable
  "good" uses "blr x9", and the output is what is expected: "func".  The
  executable "bad" uses "blr x30" and nothing is printed out.  It prints
  "func" on the actual device.

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[Qemu-devel] [Bug 1328996] Re: [AArch64] - blr x30 is handled incorrectly

[Sanjin Sijaric]

Thanks, Peter.  I just built the latest development build, and it now
passes.  Sorry for the false alarm.

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https://bugs.launchpad.net/bugs/1328996

Title:
  [AArch64] - blr x30 is handled incorrectly

Status in QEMU:
  New

Bug description:
  Whenever x30 is used as the operand for blr, the result will be
  incorrect.  There is no restriction on using x30 (LR) with the blr
  instruction in the ARMv8 manual.  There are two statically linked
  64-bit executables in files.tar.gz: good and bad.  The executable
  "good" uses "blr x9", and the output is what is expected: "func".  The
  executable "bad" uses "blr x30" and nothing is printed out.  It prints
  "func" on the actual device.

To manage notifications about this bug go to:
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[Qemu-devel] [Bug 1328996] Re: [AArch64] - blr x30 is handled incorrectly

[Sanjin Sijaric]

** Changed in: qemu
       Status: New => Fix Committed

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https://bugs.launchpad.net/bugs/1328996

Title:
  [AArch64] - blr x30 is handled incorrectly

Status in QEMU:
  Fix Committed

Bug description:
  Whenever x30 is used as the operand for blr, the result will be
  incorrect.  There is no restriction on using x30 (LR) with the blr
  instruction in the ARMv8 manual.  There are two statically linked
  64-bit executables in files.tar.gz: good and bad.  The executable
  "good" uses "blr x9", and the output is what is expected: "func".  The
  executable "bad" uses "blr x30" and nothing is printed out.  It prints
  "func" on the actual device.

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[Qemu-devel] [Bug 1328996] Re: [AArch64] - blr x30 is handled incorrectly

[T. Huth]

** Changed in: qemu
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1328996

Title:
  [AArch64] - blr x30 is handled incorrectly

Status in QEMU:
  Fix Released

Bug description:
  Whenever x30 is used as the operand for blr, the result will be
  incorrect.  There is no restriction on using x30 (LR) with the blr
  instruction in the ARMv8 manual.  There are two statically linked
  64-bit executables in files.tar.gz: good and bad.  The executable
  "good" uses "blr x9", and the output is what is expected: "func".  The
  executable "bad" uses "blr x30" and nothing is printed out.  It prints
  "func" on the actual device.

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1328996/+subscriptions