On 11/06/2015 07:36 PM, Konrad Rzeszutek Wilk wrote:
From: Martin Pohlack <mpohl...@amazon.de>
The mechanism to get this is via the XENVER_build_id and
we add a new subsequent sub-command to retrieve the
binary build-id. The hypercall allows an arbitrary
size (the buffer and len is provided to the hypervisor).
Note that one can also retrieve the value by 'readelf -h xen-syms'.
For EFI builds we re-use the same build-id that the xen-syms
was built with.
Note that there are no changes to the XSM files (dummy.c
and hooks.c) as the priviliged subops fall in the default case.
Since the new sub-ops provides the len parameter in the
arguments to the hypercall we have to modify libxc to allow
copying the arguments before the hypercall. We provide a
new macro that modifies the bounce structure to change
the direction.
snip
diff --git a/xen/arch/x86/Makefile b/xen/arch/x86/Makefile
index d4e507a..17a4830 100644
--- a/xen/arch/x86/Makefile
+++ b/xen/arch/x86/Makefile
@@ -109,15 +109,19 @@ $(TARGET)-syms: prelink.o xen.lds
$(BASEDIR)/common/symbols-dummy.o
The above invocation of ld also needs to pass "--build-id=sha1".
Otherwise, the first invocation of tools/symbols has
__note_gnu_build_id_end == __note_gnu_build_id_start, which may cause
the size of the symbol table to change later when there is actually a
build id (presumably due to the way it is compressed?) ultimately
resulting in incorrect values in the symbol table.
$(NM) -pa --format=sysv $(@D)/.$(@F).0 \
| $(BASEDIR)/tools/symbols --sysv --sort >$(@D)/.$(@F).0.S
$(MAKE) -f $(BASEDIR)/Rules.mk $(@D)/.$(@F).0.o
- $(LD) $(LDFLAGS) -T xen.lds -N prelink.o \
+ $(LD) $(LDFLAGS) -T xen.lds -N prelink.o --build-id=sha1 \
$(@D)/.$(@F).0.o -o $(@D)/.$(@F).1
$(NM) -pa --format=sysv $(@D)/.$(@F).1 \
| $(BASEDIR)/tools/symbols --sysv --sort --warn-dup
>$(@D)/.$(@F).1.S
$(MAKE) -f $(BASEDIR)/Rules.mk $(@D)/.$(@F).1.o
- $(LD) $(LDFLAGS) -T xen.lds -N prelink.o \
+ $(LD) $(LDFLAGS) -T xen.lds -N prelink.o --build-id=sha1 \
$(@D)/.$(@F).1.o -o $@
rm -f $(@D)/.$(@F).[0-9]*
--
Ross Lagerwall
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