| Commit message (Collapse) | Author | Age | Files | Lines |
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e2fcf261076b ("interrupt: Fix saving irq/ipl when linux drivers are
disabled") changed the stack layout for interrupt handlers, but missed
updating kdb_kintr's code that tries to mangle it.
This restores the control-alt-d shortcut.
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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!
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rbx was used to compute the irq index in iunit and ivect arrays,
however it should be preserved by pushing it in to the stack. As a
solution, we use rax instead, which is caller-saved.
Signed-off-by: Luca Dariz <luca@orpolo.org>
Message-Id: <20220205175129.309469-4-luca@orpolo.org>
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Message-Id: <20210405115921.184572-2-damien@zamaudio.com>
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Message-Id: <20210405052916.174771-4-damien@zamaudio.com>
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Use --enable-ncpus=x --enable-apic where x > 1 for SMP+APIC support.
Use neither for no SMP and old PIC support.
Message-Id: <20210404050812.145483-1-damien@zamaudio.com>
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* x86_64/interrupt.S: New file.
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