[PATCH] Fix building for x32 target

[Jussi Kivilinna]

* mpi/amd64/mpi-asm-defs.h: New file.
* random/rndhw.c (poll_padlock) [__x86_64__]: Also check if __LP64__ is
defined.
[USE_DRNG, __x86_64__]: Also check if __LP64__ is defined.
--

In short, x32 is new x86-64 ABI with 32-bit pointers. Adding support is
straightforward, small fix for mpi and fixes for random/rndhw.c. AMD64 assembly
functions appear to work fine with x32 and 'make check' passes.

Signed-off-by: Jussi Kivilinna <jussi.kivilinna at iki.fi>
---
 mpi/amd64/mpi-asm-defs.h |    4 ++++
 random/rndhw.c           |    4 ++--
 2 files changed, 6 insertions(+), 2 deletions(-)
 create mode 100644 mpi/amd64/mpi-asm-defs.h

diff --git a/mpi/amd64/mpi-asm-defs.h b/mpi/amd64/mpi-asm-defs.h
new file mode 100644
index 0000000..6519065
--- /dev/null
+++ b/mpi/amd64/mpi-asm-defs.h
@@ -0,0 +1,4 @@
+/* This file defines some basic constants for the MPI machinery.  We
+ * need to define the types on a per-CPU basis, so it is done with
+ * this file here.  */
+#define BYTES_PER_MPI_LIMB  (SIZEOF_UNSIGNED_LONG_LONG)
diff --git a/random/rndhw.c b/random/rndhw.c
index ca99c5f..e625512 100644
--- a/random/rndhw.c
+++ b/random/rndhw.c
@@ -69,7 +69,7 @@ poll_padlock (void (*add)(const void*, size_t, enum random_origins),
   nbytes = 0;
   while (nbytes < 64)
     {
-#ifdef __x86_64__
+#if defined(__x86_64__) && defined(__LP64__)
       asm volatile
         ("movq %1, %%rdi\n\t"         /* Set buffer.  */
          "xorq %%rdx, %%rdx\n\t"      /* Request up to 8 bytes.  */
@@ -123,7 +123,7 @@ poll_padlock (void (*add)(const void*, size_t, enum random_origins),
 #ifdef USE_DRNG
 # define RDRAND_RETRY_LOOPS	10
 # define RDRAND_INT	".byte 0x0f,0xc7,0xf0"
-# ifdef __x86_64__
+# if defined(__x86_64__) && defined(__LP64__)
 #  define RDRAND_LONG	".byte 0x48,0x0f,0xc7,0xf0"
 # else
 #  define RDRAND_LONG	RDRAND_INT