ppc64/aarch64: Export __page_{shift, size} in libcompel

Libcompel supplies to the parasite PAGE_SIZE during infection.
On ppc64/aarch64 PAGE_SIZE can be different with Large pages,
under the cover it returns __page_size.

At this moment __page_size is located in criu binary, which
prevents using libcompel as .so library in other applications
than criu on ppc64/aarch64.

Export __page_size and __page_shift in libcompel.

Fixes: #572
Fixes: 2d965008 ("ppc64/aarch64: Dynamically define PAGE_SIZE")

Cc: Adrian Reber <areber@redhat.com>
Acked-by: Cyrill Gorcunov <gorcunov@gmail.com>
Reported-by: Alexey Shabalin
Signed-off-by: Dmitry Safonov <dima@arista.com>
Signed-off-by: Andrei Vagin <avagin@gmail.com>

compel/arch/aarch64/src/lib/infect.c

@@ -11,6 +11,9 @@
 #include "infect.h"
 #include "infect-priv.h"
 
+unsigned __page_size = 0;
+unsigned __page_shift = 0;
+
 /*
  * Injected syscall instruction
  */

compel/arch/ppc64/src/lib/infect.c

@@ -22,6 +22,9 @@
 #define NT_PPC_TM_SPR   0x10c           /* TM Special Purpose Registers */
 #endif
 
+unsigned __page_size = 0;
+unsigned __page_shift = 0;
+
 /*
  * Injected syscall instruction
  */

criu/arch/aarch64/crtools.c

@@ -21,9 +21,6 @@
 #include "restorer.h"
 #include <compel/compel.h>
 
-unsigned __page_size = 0;
-unsigned __page_shift = 0;
-
 #define assign_reg(dst, src, e)		dst->e = (__typeof__(dst->e))(src)->e
 
 int save_task_regs(void *x, user_regs_struct_t *regs, user_fpregs_struct_t *fpsimd)

criu/arch/ppc64/crtools.c

@@ -23,9 +23,6 @@
 #include "images/core.pb-c.h"
 #include "images/creds.pb-c.h"
 
-unsigned __page_size = 0;
-unsigned __page_shift = 0;
-
 static UserPpc64FpstateEntry *copy_fp_regs(uint64_t *fpregs)
 {
 	UserPpc64FpstateEntry *fpe;