x86/doublefault/32: Rewrite the x86_32 #DF handler and unify with 64-bit

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The old x86_32 doublefault_fn() was old and crufty, and it did not
even try to recover.  do_double_fault() is much nicer.  Rewrite the
32-bit double fault code to sanitize CPU state and call
do_double_fault().  This is mostly an exercise i386 archaeology.

With this patch applied, 32-bit double faults get a real stack trace,
just like 64-bit double faults.

[ mingo: merged the patch to a later kernel base. ]

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>

...

This commit is contained in:

Andy Lutomirski 2019-11-20 23:06:41 -08:00 • committed by Ingo Molnar

parent dc4e0021b0

commit 7d8d8cfdee

4 changed files with 138 additions and 33 deletions

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42

arch/x86/entry/entry_32.S

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3

arch/x86/include/asm/traps.h

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105

arch/x86/kernel/doublefault_32.c

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19

arch/x86/kernel/traps.c

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