xen/x86-64: fix breakpoints and hardware watchpoints

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Native x86-64 uses the IST mechanism to run int3 and debug traps on
an alternative stack.  Xen does not do this, and so the frames were
being misinterpreted by the ptrace code.  This change special-cases
these two exceptions by using Xen variants which run on the normal
kernel stack properly.

Impact: avoid crash or bad data when IST trap is invoked under Xen
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>

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This commit is contained in:

Jeremy Fitzhardinge 2009-03-29 19:56:29 -07:00

parent 6b2e8523df

commit 6cac5a9246

3 changed files with 26 additions and 1 deletions

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3

arch/x86/include/asm/traps.h

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5

arch/x86/kernel/entry_64.S

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19

arch/x86/xen/enlighten.c

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