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diff -ru python3.orig/Modules/_ctypes/libffi/src/x86/ffi64.c python3/Modules/_ctypes/libffi/src/x86/ffi64.c
--- Modules/_ctypes/libffi/src/x86/ffi64.c 2015-07-05 18:50:07.000000000 +0200
+++ Modules/_ctypes/libffi/src/x86/ffi64.c 2015-07-26 20:18:56.457153323 +0200
@@ -548,11 +548,15 @@
tramp = (volatile unsigned short *) &closure->tramp[0];
tramp[0] = 0xbb49; /* mov <code>, %r11 */
- *((unsigned long long * volatile) &tramp[1])
- = (unsigned long) ffi_closure_unix64;
+ tramp[1] = (unsigned long) ffi_closure_unix64;
+ tramp[2] = ((unsigned long) ffi_closure_unix64) >> 16;
+ tramp[3] = ((unsigned long) ffi_closure_unix64) >> 32;
+ tramp[4] = ((unsigned long) ffi_closure_unix64) >> 48;
tramp[5] = 0xba49; /* mov <data>, %r10 */
- *((unsigned long long * volatile) &tramp[6])
- = (unsigned long) codeloc;
+ tramp[6] = (unsigned long) codeloc;
+ tramp[7] = ((unsigned long) codeloc) >> 16;
+ tramp[8] = ((unsigned long) codeloc) >> 32;
+ tramp[9] = ((unsigned long) codeloc) >> 48;
/* Set the carry bit iff the function uses any sse registers.
This is clc or stc, together with the first byte of the jmp. */
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