** Changed in: qemu
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1926759
Title:
WFI instruction results in unhandled CPU exception
Status in QEMU:
F
Fix has been merged:
https://gitlab.com/qemu-project/qemu/-/commit/5b2c8af89b82a671137a
** Changed in: qemu
Status: In Progress => Fix Committed
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Should be fixed by:
https://patchew.org/QEMU/20210430162212.825-1-peter.mayd...@linaro.org/
** Changed in: qemu
Status: Confirmed => Won't Fix
** Changed in: qemu
Status: Won't Fix => In Progress
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We do implement those traps, but only in the system mode emulator,
because it makes no sense to trap to EL2 in the usermode emulator where
EL2 doesn't exist.
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I agree with this implementation. Though WFI seems make no sense for a
userspace program, we should not have assumption that the userspace
program will not use this instruction.
It seems ARM manual does not defined the implementation of function
EnterLowPowerState(); However, before executing thi
The aarch64 kernel traps and handles WFI as a NOP:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c219bc4e9205
-- so that's probably the most sensible implementation for our linux-user
mode. (The aarch32 kernel doesn't trap it, yet, but
"WFI is a NOP" is a valid a
Crash repros on current QEMU.
This is a bug, in that we shouldn't crash like this. However, it doesn't
really make any sense for a userspace program (which is what a binary
run by qemu-arm is) to execute the WFI instruction, which is largely
intended for OSes to use. If your guest binary needs to
Please provide a test case binary and your QEMU command line.
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https://bugs.launchpad.net/bugs/1926759
Title:
WFI instruction results in unhandled CPU exception
Status in QEMU:
New
Oh, and the QEMU version you're using as well, please.
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Title:
WFI instruction results in unhandled CPU exception
Status in QEMU:
New
Bug de
cmd： ~/qemu-5.1.0/arm-linux-user/qemu-arm ~/test2
QEMU version: qemu-arm version 5.1.0
Sorry that I didn't test it on the latest version of QEMU.
** Attachment added: "test2"
https://bugs.launchpad.net/qemu/+bug/1926759/+attachment/5493873/+files/test2
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