ARMv7 LPAE: IFSR doesn't have the LPAE bit in case of BKPT
Bug #1756927 reported by
Vincent Siles
This bug affects 1 person
| Affects | Status | Importance | Assigned to | Milestone | |
|---|---|---|---|---|---|
| QEMU |
Fix Released
|
Undecided
|
Unassigned | ||
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: 48ae1f60d8c9a77
Ubuntu verison: 16.04 LTS
Cross Compiler: gcc linaro 6.3.1-2017.
Revision history for this message
| Vincent Siles (vsiles) wrote | #1 |
Revision history for this message
| Peter Maydell (pmaydell) wrote | #2 |
| Changed in qemu: | |
| status: | New → In Progress |
| tags: | added: arm |
Revision history for this message
| Vincent Siles (vsiles) wrote | #3 |
Revision history for this message
| Peter Maydell (pmaydell) wrote | #4 |
| Changed in qemu: | |
| status: | In Progress → Fix Committed |
Revision history for this message
| Vincent Siles (vsiles) wrote | #5 |
| Changed in qemu: | |
| status: | Fix Committed → Fix Released |
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I've just sent this patchset:
http://<email address hidden>/
which should fix this bug and a couple of others that I noticed with our debug exception handling while I was doing that.