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-rw-r--r--sysdeps/aarch64/memset-reg.h30
-rw-r--r--sysdeps/aarch64/memset.S27
-rw-r--r--sysdeps/aarch64/multiarch/Makefile2
-rw-r--r--sysdeps/aarch64/multiarch/ifunc-impl-list.c5
-rw-r--r--sysdeps/aarch64/multiarch/init-arch.h8
-rw-r--r--sysdeps/aarch64/multiarch/memset.c40
-rw-r--r--sysdeps/aarch64/multiarch/memset_falkor.S53
-rw-r--r--sysdeps/aarch64/multiarch/memset_generic.S27
-rw-r--r--sysdeps/aarch64/multiarch/rtld-memset.S23
-rw-r--r--sysdeps/unix/sysv/linux/aarch64/cpu-features.c10
-rw-r--r--sysdeps/unix/sysv/linux/aarch64/cpu-features.h1
11 files changed, 204 insertions, 22 deletions
diff --git a/sysdeps/aarch64/memset-reg.h b/sysdeps/aarch64/memset-reg.h
new file mode 100644
index 0000000000..518e562c0e
--- /dev/null
+++ b/sysdeps/aarch64/memset-reg.h
@@ -0,0 +1,30 @@
+/* Register aliases for memset to be used across implementations.
+   Copyright (C) 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/>.  */
+
+#define dstin	x0
+#define val	x1
+#define valw	w1
+#define count	x2
+#define dst	x3
+#define dstend	x4
+#define tmp1	x5
+#define tmp1w	w5
+#define tmp2	x6
+#define tmp2w	w6
+#define zva_len x7
+#define zva_lenw w7
diff --git a/sysdeps/aarch64/memset.S b/sysdeps/aarch64/memset.S
index 110fd22781..45fb0a86a9 100644
--- a/sysdeps/aarch64/memset.S
+++ b/sysdeps/aarch64/memset.S
@@ -17,6 +17,7 @@
    <http://www.gnu.org/licenses/>.  */
 
 #include <sysdep.h>
+#include "memset-reg.h"
 
 /* Assumptions:
  *
@@ -24,20 +25,7 @@
  *
  */
 
-#define dstin	x0
-#define val	x1
-#define valw	w1
-#define count	x2
-#define dst	x3
-#define dstend	x4
-#define tmp1	x5
-#define tmp1w	w5
-#define tmp2	x6
-#define tmp2w	w6
-#define zva_len x7
-#define zva_lenw w7
-
-ENTRY_ALIGN (__memset, 6)
+ENTRY_ALIGN (MEMSET, 6)
 
 	DELOUSE (0)
 	DELOUSE (2)
@@ -108,8 +96,11 @@ L(tail64):
 	stp	q0, q0, [dstend, -32]
 	ret
 
-	.p2align 3
 L(try_zva):
+#ifdef ZVA_MACRO
+	zva_macro
+#else
+	.p2align 3
 	mrs	tmp1, dczid_el0
 	tbnz	tmp1w, 4, L(no_zva)
 	and	tmp1w, tmp1w, 15
@@ -189,7 +180,7 @@ L(zva_other):
 	b.hs	3b
 4:	add	count, count, zva_len
 	b	L(tail64)
+#endif
 
-END (__memset)
-weak_alias (__memset, memset)
-libc_hidden_builtin_def (memset)
+END (MEMSET)
+libc_hidden_builtin_def (MEMSET)
diff --git a/sysdeps/aarch64/multiarch/Makefile b/sysdeps/aarch64/multiarch/Makefile
index 9aa1e79a80..aa179c499e 100644
--- a/sysdeps/aarch64/multiarch/Makefile
+++ b/sysdeps/aarch64/multiarch/Makefile
@@ -1,4 +1,4 @@
 ifeq ($(subdir),string)
 sysdep_routines += memcpy_generic memcpy_thunderx memcpy_falkor \
-		   memmove_falkor
+		   memmove_falkor memset_generic memset_falkor
 endif
diff --git a/sysdeps/aarch64/multiarch/ifunc-impl-list.c b/sysdeps/aarch64/multiarch/ifunc-impl-list.c
index 2cb74d5b43..b19fcdb689 100644
--- a/sysdeps/aarch64/multiarch/ifunc-impl-list.c
+++ b/sysdeps/aarch64/multiarch/ifunc-impl-list.c
@@ -46,6 +46,11 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
 	      IFUNC_IMPL_ADD (array, i, memmove, 1, __memmove_thunderx)
 	      IFUNC_IMPL_ADD (array, i, memmove, 1, __memmove_falkor)
 	      IFUNC_IMPL_ADD (array, i, memmove, 1, __memmove_generic))
+  IFUNC_IMPL (i, name, memset,
+	      /* Enable this on non-falkor processors too so that other cores
+		 can do a comparative analysis with __memset_generic.  */
+	      IFUNC_IMPL_ADD (array, i, memset, (zva_size == 64), __memset_falkor)
+	      IFUNC_IMPL_ADD (array, i, memset, 1, __memset_generic))
 
   return i;
 }
diff --git a/sysdeps/aarch64/multiarch/init-arch.h b/sysdeps/aarch64/multiarch/init-arch.h
index 3af442c538..a756dada10 100644
--- a/sysdeps/aarch64/multiarch/init-arch.h
+++ b/sysdeps/aarch64/multiarch/init-arch.h
@@ -18,6 +18,8 @@
 
 #include <ldsodefs.h>
 
-#define INIT_ARCH()				\
-  uint64_t __attribute__((unused)) midr =	\
-    GLRO(dl_aarch64_cpu_features).midr_el1;
+#define INIT_ARCH()							      \
+  uint64_t __attribute__((unused)) midr =				      \
+    GLRO(dl_aarch64_cpu_features).midr_el1;				      \
+  unsigned __attribute__((unused)) zva_size =				      \
+    GLRO(dl_aarch64_cpu_features).zva_size;
diff --git a/sysdeps/aarch64/multiarch/memset.c b/sysdeps/aarch64/multiarch/memset.c
new file mode 100644
index 0000000000..66e00eee00
--- /dev/null
+++ b/sysdeps/aarch64/multiarch/memset.c
@@ -0,0 +1,40 @@
+/* Multiple versions of memset. AARCH64 version.
+   Copyright (C) 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/>.  */
+
+/* Define multiple versions only for the definition in libc.  */
+
+#if IS_IN (libc)
+/* Redefine memset so that the compiler won't complain about the type
+   mismatch with the IFUNC selector in strong_alias, below.  */
+# undef memset
+# define memset __redirect_memset
+# include <string.h>
+# include <init-arch.h>
+
+extern __typeof (__redirect_memset) __libc_memset;
+
+extern __typeof (__redirect_memset) __memset_falkor attribute_hidden;
+extern __typeof (__redirect_memset) __memset_generic attribute_hidden;
+
+libc_ifunc (__libc_memset, (IS_FALKOR (midr) && zva_size == 64
+			    ? __memset_falkor
+			    : __memset_generic));
+
+# undef memset
+strong_alias (__libc_memset, memset);
+#endif
diff --git a/sysdeps/aarch64/multiarch/memset_falkor.S b/sysdeps/aarch64/multiarch/memset_falkor.S
new file mode 100644
index 0000000000..4fcfb2ff50
--- /dev/null
+++ b/sysdeps/aarch64/multiarch/memset_falkor.S
@@ -0,0 +1,53 @@
+/* Memset for falkor.
+   Copyright (C) 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 <memset-reg.h>
+
+/* Reading dczid_el0 is expensive on falkor so move it into the ifunc
+   resolver and assume ZVA size of 64 bytes.  The IFUNC resolver takes care to
+   use this function only when ZVA is enabled.  */
+
+#if IS_IN (libc)
+.macro zva_macro
+	.p2align 4
+	/* Write the first and last 64 byte aligned block using stp rather
+	   than using DC ZVA.  This is faster on some cores.  */
+	str	q0, [dst, 16]
+	stp	q0, q0, [dst, 32]
+	bic	dst, dst, 63
+	stp	q0, q0, [dst, 64]
+	stp	q0, q0, [dst, 96]
+	sub	count, dstend, dst	/* Count is now 128 too large.	*/
+	sub	count, count, 128+64+64	/* Adjust count and bias for loop.  */
+	add	dst, dst, 128
+1:	dc	zva, dst
+	add	dst, dst, 64
+	subs	count, count, 64
+	b.hi	1b
+	stp	q0, q0, [dst, 0]
+	stp	q0, q0, [dst, 32]
+	stp	q0, q0, [dstend, -64]
+	stp	q0, q0, [dstend, -32]
+	ret
+.endm
+
+# define ZVA_MACRO zva_macro
+# define MEMSET __memset_falkor
+# include <sysdeps/aarch64/memset.S>
+#endif
diff --git a/sysdeps/aarch64/multiarch/memset_generic.S b/sysdeps/aarch64/multiarch/memset_generic.S
new file mode 100644
index 0000000000..55134ed4ea
--- /dev/null
+++ b/sysdeps/aarch64/multiarch/memset_generic.S
@@ -0,0 +1,27 @@
+/* Memset for aarch64, default version for internal use.
+   Copyright (C) 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/>.  */
+
+#if IS_IN (libc)
+# define MEMSET __memset_generic
+/* Add a hidden definition for use within libc.so.  */
+# ifdef SHARED
+	.globl __GI_memset; __GI_memset = __memset_generic
+# endif
+# include <sysdeps/aarch64/memset.S>
+#endif
diff --git a/sysdeps/aarch64/multiarch/rtld-memset.S b/sysdeps/aarch64/multiarch/rtld-memset.S
new file mode 100644
index 0000000000..44373930bb
--- /dev/null
+++ b/sysdeps/aarch64/multiarch/rtld-memset.S
@@ -0,0 +1,23 @@
+/* Memset for aarch64, for the dynamic linker.
+   Copyright (C) 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/>.  */
+
+#if IS_IN (rtld)
+# define MEMSET memset
+# include <sysdeps/aarch64/memset.S>
+#endif
diff --git a/sysdeps/unix/sysv/linux/aarch64/cpu-features.c b/sysdeps/unix/sysv/linux/aarch64/cpu-features.c
index e769eeb35f..092ee81087 100644
--- a/sysdeps/unix/sysv/linux/aarch64/cpu-features.c
+++ b/sysdeps/unix/sysv/linux/aarch64/cpu-features.c
@@ -20,6 +20,9 @@
 #include <sys/auxv.h>
 #include <elf/dl-hwcaps.h>
 
+#define DCZID_DZP_MASK (1 << 4)
+#define DCZID_BS_MASK (0xf)
+
 #if HAVE_TUNABLES
 struct cpu_list
 {
@@ -72,4 +75,11 @@ init_cpu_features (struct cpu_features *cpu_features)
     }
 
   cpu_features->midr_el1 = midr;
+
+  /* Check if ZVA is enabled.  */
+  unsigned dczid;
+  asm volatile ("mrs %0, dczid_el0" : "=r"(dczid));
+
+  if ((dczid & DCZID_DZP_MASK) == 0)
+    cpu_features->zva_size = 4 << (dczid & DCZID_BS_MASK);
 }
diff --git a/sysdeps/unix/sysv/linux/aarch64/cpu-features.h b/sysdeps/unix/sysv/linux/aarch64/cpu-features.h
index 73cb53da9a..f2b6afdba0 100644
--- a/sysdeps/unix/sysv/linux/aarch64/cpu-features.h
+++ b/sysdeps/unix/sysv/linux/aarch64/cpu-features.h
@@ -47,6 +47,7 @@
 struct cpu_features
 {
   uint64_t midr_el1;
+  unsigned zva_size;
 };
 
 #endif /* _CPU_FEATURES_AARCH64_H  */
generated by cgit-pink 1.4.1 (git 2.36.1) at 2024-10-22 19:15:45 +0000