[Qemu-devel] [Bug 1756927] [NEW] ARMv7 LPAE: IFSR doesn't have the LPAE bit in case of BKPT

[Vincent Siles]

Public bug reported:

When a user application triggers a 'bkpt' instruction while LPAE is
used, the bit [9] of IFSR is not correctly set during the prefetch abort
exception.

You'll find attached a minimal example to reproduce the issue (just run 'make 
all').
The output I get is:

supervisor
user
prefetch
short-descriptor

The last entry should read 'long-descriptor'.


Qemu revision: 48ae1f60d8c9a770e6da64407984d84e25253c69
Ubuntu verison: 16.04 LTS
Cross Compiler: gcc linaro 6.3.1-2017.02-x86_64_arm-eabi

** Affects: qemu
     Importance: Undecided
         Status: New

** Attachment added: "Minimal example with linker script and makefile"
   
https://bugs.launchpad.net/bugs/1756927/+attachment/5084186/+files/ifsr_br.tar.gz

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https://bugs.launchpad.net/bugs/1756927

Title:
  ARMv7 LPAE: IFSR doesn't have the LPAE bit in case of BKPT

Status in QEMU:
  New

Bug description:
  When a user application triggers a 'bkpt' instruction while LPAE is
  used, the bit [9] of IFSR is not correctly set during the prefetch
  abort exception.

  You'll find attached a minimal example to reproduce the issue (just run 'make 
all').
  The output I get is:

  supervisor
  user
  prefetch
  short-descriptor

  The last entry should read 'long-descriptor'.

  
  Qemu revision: 48ae1f60d8c9a770e6da64407984d84e25253c69
  Ubuntu verison: 16.04 LTS
  Cross Compiler: gcc linaro 6.3.1-2017.02-x86_64_arm-eabi

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