PowerPC: initial support for multilib for PowerPC32

This patch add a empty Makefile, the C IFUNC helper macros, and a empty
available IFUNC implementation enumeration.

1 files changed, 52 insertions, 0 deletions

diff --git a/sysdeps/powerpc/powerpc32/power4/multiarch/init-arch.h b/sysdeps/powerpc/powerpc32/power4/multiarch/init-arch.h
new file mode 100644
index 0000000000..490c0b4e7a
--- /dev/null
+++ b/sysdeps/powerpc/powerpc32/power4/multiarch/init-arch.h
@@ -0,0 +1,52 @@
+/* This file is part of the GNU C Library.
+   Copyright (C) 2013 Free Software Foundation, Inc.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <ldsodefs.h>
+
+/* The code checks if _rtld_global_ro was realocated before trying to access
+   the dl_hwcap field. The assembly is to make the compiler not optimize the
+   test (&_rtld_global_ro != NULL), which is always true in ISO C (but not
+   in that case since _rtld_global_ro might not been realocated yet).  */
+#if defined(SHARED) && !defined(IS_IN_rtld)
+# define __GLRO(value) \
+  ({ volatile void **__p = (volatile void**)(&_rtld_global_ro);	\
+    unsigned long int __ret;					\
+     asm ("# x in %0" : "+r" (__p));				\
+     __ret = (__p) ? GLRO(value) : 0;				\
+     __ret; })
+#else
+# define __GLRO(value)  GLRO(value)
+#endif
+
+/* dl_hwcap contains only the latest supported ISA, the macro checks which is
+   and fills the previous ones.  */
+#define INIT_ARCH() \
+  unsigned long int hwcap = __GLRO(dl_hwcap); 			\
+  if (hwcap & PPC_FEATURE_ARCH_2_06)				\
+    hwcap |= PPC_FEATURE_ARCH_2_05 |				\
+	     PPC_FEATURE_POWER5_PLUS |				\
+	     PPC_FEATURE_POWER5 |				\
+	     PPC_FEATURE_POWER4;				\
+  else if (hwcap & PPC_FEATURE_ARCH_2_05)			\
+    hwcap |= PPC_FEATURE_POWER5_PLUS |				\
+	     PPC_FEATURE_POWER5 |				\
+	     PPC_FEATURE_POWER4;				\
+  else if (hwcap & PPC_FEATURE_POWER5_PLUS)			\
+    hwcap |= PPC_FEATURE_POWER5 |				\
+	     PPC_FEATURE_POWER4;				\
+  else if (hwcap & PPC_FEATURE_POWER5)				\
+    hwcap |= PPC_FEATURE_POWER4;