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arm64: Clear td_frame when returning to userspace

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When returning from an exception to userspace clear the saved td_frame.
On the next exception this should point to the frame, however this is
not guaranteed.

To ensure the trap frame pointer is either valid or NULL clear it
before returning to userspace in the EL0 synchronous exception handler.

Reviewed by:	kib, markj
Sponsored by:	Arm Ltd
Differential Revision:	https://reviews.freebsd.org/D44807

(cherry picked from commit 4eec584d79c1e8375d863c7eec7229ac7ec3f13b)
This commit is contained in:
Andrew Turner 2024-06-12 14:08:13 +01:00
parent d5e29c62e9
commit 8b9f8a7e76
1 changed files with 2 additions and 0 deletions
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2
sys/arm64/arm64/exception.S
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@ -214,9 +214,11 @@ ENTRY(handle_el0_sync)
save_registers 0
ldr x0, [x18, #PC_CURTHREAD]
mov x1, sp
mov x22, x0
str x1, [x0, #TD_FRAME]
bl do_el0_sync
do_ast
str xzr, [x22, #TD_FRAME]
restore_registers 0
ERET
END(handle_el0_sync)