[POWERPC] Support feature fixups in vdso's

This patch reworks the feature fixup mecanism so vdso's can be fixed up.
The main issue was that the construct:

        .long   label  (or .llong on 64 bits)

will not work in the case of a shared library like the vdso. It will
generate an empty placeholder in the fixup table along with a reloc,
which is not something we can deal with in the vdso.

The idea here (thanks Alan Modra !) is to instead use something like:

1:
        .long   label - 1b

That is, the feature fixup tables no longer contain addresses of bits of
code to patch, but offsets of such code from the fixup table entry
itself. That is properly resolved by ld when building the .so's. I've
modified the fixup mecanism generically to use that method for the rest
of the kernel as well.

Another trick is that the 32 bits vDSO included in the 64 bits kernel
need to have a table in the 64 bits format. However, gas does not
support 32 bits code with a statement of the form:

        .llong  label - 1b  (Or even just .llong label)

That is, it cannot emit the right fixup/relocation for the linker to use
to assign a 32 bits address to an .llong field. Thus, in the specific
case of the 32 bits vdso built as part of the 64 bits kernel, we are
using a modified macro that generates:

        .long   0xffffffff
        .llong  label - 1b

Note that is assumes that the value is negative which is enforced by
the .lds (those offsets are always negative as the .text is always
before the fixup table and gas doesn't support emiting the reloc the
other way around).

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 5 insertions, 10 deletions

diff --git a/include/asm-powerpc/firmware.h b/include/asm-powerpc/firmware.h
index c16e0a6b9dab..fdf9aff71150 100644
--- a/include/asm-powerpc/firmware.h
+++ b/include/asm-powerpc/firmware.h
@@ -100,17 +100,12 @@ extern unsigned int __start___fw_ftr_fixup, __stop___fw_ftr_fixup;
 
 #else /* __ASSEMBLY__ */
 
-#define BEGIN_FW_FTR_SECTION            96:
-
+#define BEGIN_FW_FTR_SECTION_NESTED(label)      label:
+#define BEGIN_FW_FTR_SECTION                    BEGIN_FW_FTR_SECTION_NESTED(97)
+#define END_FW_FTR_SECTION_NESTED(msk, val, label) \
+        MAKE_FTR_SECTION_ENTRY(msk, val, label, __fw_ftr_fixup)
 #define END_FW_FTR_SECTION(msk, val)            \
-97:                                             \
-        .section __fw_ftr_fixup,"a";            \
-        .align 3;                               \
-        .llong msk;                             \
-        .llong val;                             \
-        .llong 96b;                             \
-        .llong 97b;                             \
-        .previous
+        END_FW_FTR_SECTION_NESTED(msk, val, 97)
 
 #define END_FW_FTR_SECTION_IFSET(msk)   END_FW_FTR_SECTION((msk), (msk))
 #define END_FW_FTR_SECTION_IFCLR(msk)   END_FW_FTR_SECTION((msk), 0)