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Due to the packing into a bit field together with a relocated field,
the computation can overflow when the relocated field ends up getting a
negative value stored. Hence it isn't sufficient to correct the value
by 1 in this case, but we also need to mask the result to the width of
the original bit field.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Keir Fraser <keir@xen.org>
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This helps avoid static analysis false-positives, and might lead to
better code density as the compiler knows it doesn't have to restore
spilled state &c.
Signed-off-by: Tim Deegan <tim@xen.org>
Acked-by: Keir Fraser <keir@xen.org>
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Spotted because it breaks the clang build for LLVM <3.2. .ifnes is
not right here as it will choke on a string with embedded quotes.
.ifnb would be better except that LLVM <3.2 doesn't support that either
(and nor does binutils 2.16).
It should be possible to use something like !!msg or !!msg[0] instead
of a separate flag, but I gave up trying to find something that would
make it through CPP, asm() and gas as a usable constant. :|
Signed-off-by: Tim Deegan <tim@xen.org>
Acked-by: Jan Beulich <jbeulich@suse.com>
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Just like Linux did many years ago, move them into a separate (data)
section, such that they no longer pollute instruction caches and TLBs.
Assertion frames, requiring two pointers to be stored, occupy two slots
in the array, with the second slot mimicking a frame the location
pointer of which doesn't match any address within .text or .init.text
(it effectively points back to the slot itself, which - being in a data
section - can't be reached by non-buggy execution).
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Keir Fraser <keir@xen.org>
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Signed-off-by: Keir Fraser <keir@xen.org>
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This is needed to compile xen with clang.
Signed-off-by: Tim Deegan <Tim.Deegan@citrix.com>
Acked-by: Keir Fraser <keir@xen.org>
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run_in_exception_handler _does_ have other users.
Signed-off-by: Tim Deegan <Tim.Deegan@citrix.com>
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(dump_execution_state()) as its own bug-trap.
This is needed to compile xen with clang, which can't handle using a
function name in an asm immediate.
Signed-off-by: Tim Deegan <Tim.Deegan@citrix.com>
Acked-by: Keir Fraser <keir@xen.org>
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So that:
(XEN) Assertion '!(((*({ unsigned long __ptr; __asm__ ("" :
"=r"(__ptr) : "0"(&per_cpu____preempt_count));
(typeof(&per_cpu____preempt_count)) (__ptr +
(get_cpu_info()->per_cpu_offset)); }))) ||
((irq_stat[(((get_cpu_info()->processor_id)1...
becomes:
(XEN) Assertion '"!in_atomic()"' failed at softirq.c:61
Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
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get proper regs argument.
Signed-off-by: Keir Fraser <keir.fraser@citrix.com>
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Since it's only the string pointer representations that differ between
i386 and x86-64, abstract out those and make everything else shared.
While touching this code, also use
- proper instructions rather than a mixture of such and raw .byte/
.long/.quad data emissions,
- PC-relative pointers on x86-64 to cut the amount of storage (and
in particular cache space) needed for string references by half.
Signed-off-by: Jan Beulich <jbeulich@novell.com>
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Based on a patch by Jan Beulich <jbeulich@novell.com>
Signed-off-by: Keir Fraser <keir@xensource.com>
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Signed-off-by: Keir Fraser <keir@xensource.com>
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Signed-off-by: Keir Fraser <keir@xensource.com>
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