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commit e2fcf261076bfe00eed678dcfd2f86b4854b5516
Author: Samuel Thibault <samuel.thiba...@ens-lyon.org>
Date: Sat Sep 17 20:05:26 2022 +0200
interrupt: Fix saving irq/ipl when linux drivers are disabled
When Linux drivers are disabled, in hardclock() the linux_timer_intr()
call is dropped, and gcc can tail-recursion-optimize the call to
clock_interrupt(). To do so, it overwrites the hardclock() parameters to
suit the clock_interrupt parameters layout. This however means it thrashes
the backups that the interrupt() function had made of irq/ipl, leading to
mayhem.
interrupt should thus really properly separate its irq/ipl backups from the
interrupt function parameters.
Thanks a lot to Etienne Brateau for the tricky investigation!
-----------------------------------------------------------------------
Summary of changes:
i386/i386at/interrupt.S | 51 +++++++++++++++++++++++++++++++++++--------------
x86_64/interrupt.S | 44 +++++++++++++++++++++++++++++-------------
2 files changed, 68 insertions(+), 27 deletions(-)
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