Prepare for radical source tree reorganization. zack/build-layout-experiment

All top-level files and directories are moved into a temporary storage
directory, REORG.TODO, except for files that will certainly still
exist in their current form at top level when we're done (COPYING,
COPYING.LIB, LICENSES, NEWS, README), all old ChangeLog files (which
are moved to the new directory OldChangeLogs, instead), and the
generated file INSTALL (which is just deleted; in the new order, there
will be no generated files checked into version control).

1 files changed, 84 insertions, 0 deletions

diff --git a/REORG.TODO/sysdeps/powerpc/hwcapinfo.c b/REORG.TODO/sysdeps/powerpc/hwcapinfo.c
new file mode 100644
index 0000000000..82ad222c36
--- /dev/null
+++ b/REORG.TODO/sysdeps/powerpc/hwcapinfo.c
@@ -0,0 +1,84 @@
+/* powerpc HWCAP/HWCAP2 and AT_PLATFORM data pre-processing.
+   Copyright (C) 2015-2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   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 <unistd.h>
+#include <shlib-compat.h>
+#include <dl-procinfo.h>
+
+uint64_t __tcb_hwcap __attribute__ ((visibility ("hidden")));
+uint32_t __tcb_platform __attribute__ ((visibility ("hidden")));
+
+/* This function parses the HWCAP/HWCAP2 fields, adding the previous supported
+   ISA bits, as well as converting the AT_PLATFORM string to a number.  This
+   data is stored in two global variables that can be used later by the
+   powerpc-specific code to store it into the TCB.  */
+void
+__tcb_parse_hwcap_and_convert_at_platform (void)
+{
+
+  uint64_t h1, h2;
+
+  /* Read AT_PLATFORM string from auxv and convert it to a number.  */
+  __tcb_platform = _dl_string_platform (GLRO (dl_platform));
+
+  /* Read HWCAP and HWCAP2 from auxv.  */
+  h1 = GLRO (dl_hwcap);
+  h2 = GLRO (dl_hwcap2);
+
+  /* hwcap contains only the latest supported ISA, the code checks which is
+     and fills the previous supported ones.  */
+
+  if (h2 & PPC_FEATURE2_ARCH_2_07)
+    h1 |= PPC_FEATURE_ARCH_2_06
+       | PPC_FEATURE_ARCH_2_05
+       | PPC_FEATURE_POWER5_PLUS
+       | PPC_FEATURE_POWER5
+       | PPC_FEATURE_POWER4;
+  else if (h1 & PPC_FEATURE_ARCH_2_06)
+    h1 |= PPC_FEATURE_ARCH_2_05
+       | PPC_FEATURE_POWER5_PLUS
+       | PPC_FEATURE_POWER5
+       | PPC_FEATURE_POWER4;
+  else if (h1 & PPC_FEATURE_ARCH_2_05)
+    h1 |= PPC_FEATURE_POWER5_PLUS
+       | PPC_FEATURE_POWER5
+       | PPC_FEATURE_POWER4;
+  else if (h1 & PPC_FEATURE_POWER5_PLUS)
+    h1 |= PPC_FEATURE_POWER5
+       | PPC_FEATURE_POWER4;
+  else if (h1 & PPC_FEATURE_POWER5)
+    h1 |= PPC_FEATURE_POWER4;
+
+  /* Consolidate both HWCAP and HWCAP2 into a single doubleword so that
+     we can read both in a single load later.  */
+  __tcb_hwcap = h2;
+  __tcb_hwcap = (h1 << 32) | __tcb_hwcap;
+
+}
+#if IS_IN (rtld)
+versioned_symbol (ld, __tcb_parse_hwcap_and_convert_at_platform, \
+		  __parse_hwcap_and_convert_at_platform, GLIBC_2_23);
+#endif
+
+/* Export __parse_hwcap_and_convert_at_platform in libc.a.  This is used by
+   GCC to make sure that the HWCAP/Platform bits are stored in the TCB when
+   using __builtin_cpu_is()/__builtin_cpu_supports() in the static case.  */
+#ifndef SHARED
+weak_alias (__tcb_parse_hwcap_and_convert_at_platform, \
+	    __parse_hwcap_and_convert_at_platform);
+#endif