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[PATCH 1/2] aarch64: Add multiarch variants of __memcpy_chk

From: Siddhesh Poyarekar <siddhesh at sourceware dot org>
To: libc-alpha at sourceware dot org
Date: Fri, 11 Aug 2017 12:44:13 +0530
Subject: [PATCH 1/2] aarch64: Add multiarch variants of __memcpy_chk
Authentication-results: sourceware.org; auth=none
References: <1502435654-18032-1-git-send-email-siddhesh@sourceware.org>

In its current form, __memcpy_chk calls the generic version of memcpy,
thereby defeating the point of the optimization.  Add multiarch
__memcpy_chk variant snippets that call their respective memcpy
functions.

	* sysdeps/aarch64/memcpy.S
	* sysdeps/aarch64/multiarch/Makefile
	* sysdeps/aarch64/multiarch/ifunc-impl-list.c
	* sysdeps/aarch64/multiarch/memcpy_falkor.S
	* sysdeps/aarch64/multiarch/memcpy_generic.S
	* sysdeps/aarch64/multiarch/memcpy_thunderx.S
---
 sysdeps/aarch64/memcpy.S                    | 16 +++++++++++++++-
 sysdeps/aarch64/multiarch/Makefile          |  4 ++++
 sysdeps/aarch64/multiarch/ifunc-impl-list.c |  4 ++++
 sysdeps/aarch64/multiarch/memcpy_falkor.S   | 13 ++++++++++++-
 sysdeps/aarch64/multiarch/memcpy_generic.S  |  5 +++++
 sysdeps/aarch64/multiarch/memcpy_thunderx.S | 13 ++++++++++++-
 6 files changed, 52 insertions(+), 3 deletions(-)

diff --git a/sysdeps/aarch64/memcpy.S b/sysdeps/aarch64/memcpy.S
index 88a3b90..18ef29e 100644
--- a/sysdeps/aarch64/memcpy.S
+++ b/sysdeps/aarch64/memcpy.S
@@ -27,6 +27,7 @@
 #define dstin	x0
 #define src	x1
 #define count	x2
+#define dstlen	x3
 #define dst	x3
 #define srcend	x4
 #define dstend	x5
@@ -66,7 +67,20 @@
 # define MEMCPY memcpy
 #endif
 
-ENTRY_ALIGN (MEMMOVE, 6)
+#if defined SHARED && IS_IN (libc)
+#ifndef MEMCPY_CHK
+# define MEMCPY_CHK __memcpy_chk
+#endif
+
+ENTRY_ALIGN (MEMCPY_CHK, 6)
+	cmp	dstlen, count
+	b.lo	__chk_fail
+	b	MEMCPY
+	nop
+END (MEMCPY_CHK)
+#endif
+
+ENTRY (MEMMOVE)
 
 	DELOUSE (0)
 	DELOUSE (1)
diff --git a/sysdeps/aarch64/multiarch/Makefile b/sysdeps/aarch64/multiarch/Makefile
index 164ba1a..8189eb4 100644
--- a/sysdeps/aarch64/multiarch/Makefile
+++ b/sysdeps/aarch64/multiarch/Makefile
@@ -1,3 +1,7 @@
 ifeq ($(subdir),string)
 sysdep_routines += memcpy_generic memcpy_thunderx memcpy_falkor
 endif
+
+ifeq ($(subdir),debug)
+sysdep_routines += memcpy_chk-nonshared
+endif
diff --git a/sysdeps/aarch64/multiarch/ifunc-impl-list.c b/sysdeps/aarch64/multiarch/ifunc-impl-list.c
index 8e873b3..d534818 100644
--- a/sysdeps/aarch64/multiarch/ifunc-impl-list.c
+++ b/sysdeps/aarch64/multiarch/ifunc-impl-list.c
@@ -42,6 +42,10 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
 	      IFUNC_IMPL_ADD (array, i, memcpy, 1, __memcpy_thunderx)
 	      IFUNC_IMPL_ADD (array, i, memcpy, 1, __memcpy_falkor)
 	      IFUNC_IMPL_ADD (array, i, memcpy, 1, __memcpy_generic))
+  IFUNC_IMPL (i, name, __memcpy_chk,
+	      IFUNC_IMPL_ADD (array, i, __memcpy_chk, 1, __memcpy_chk_thunderx)
+	      IFUNC_IMPL_ADD (array, i, __memcpy_chk, 1, __memcpy_chk_falkor)
+	      IFUNC_IMPL_ADD (array, i, __memcpy_chk, 1, __memcpy_chk_generic))
   IFUNC_IMPL (i, name, memmove,
 	      IFUNC_IMPL_ADD (array, i, memmove, 1, __memmove_thunderx)
 	      IFUNC_IMPL_ADD (array, i, memmove, 1, __memmove_generic))
diff --git a/sysdeps/aarch64/multiarch/memcpy_falkor.S b/sysdeps/aarch64/multiarch/memcpy_falkor.S
index dea4f22..181940f 100644
--- a/sysdeps/aarch64/multiarch/memcpy_falkor.S
+++ b/sysdeps/aarch64/multiarch/memcpy_falkor.S
@@ -26,6 +26,7 @@
 #define dstin	x0
 #define src	x1
 #define count	x2
+#define dstlen	x3
 #define dst	x3
 #define srcend	x4
 #define dstend	x5
@@ -60,7 +61,17 @@
    The non-temporal stores help optimize cache utilization.  */
 
 #if IS_IN (libc)
-ENTRY_ALIGN (__memcpy_falkor, 6)
+
+# ifdef SHARED
+ENTRY_ALIGN (__memcpy_chk_falkor, 6)
+	cmp	dstlen, count
+	b.lo	__chk_fail
+	nop
+	nop
+END (__memcpy_chk_falkor)
+# endif
+
+ENTRY(__memcpy_falkor)
 
 	cmp	count, 32
 	add	srcend, src, count
diff --git a/sysdeps/aarch64/multiarch/memcpy_generic.S b/sysdeps/aarch64/multiarch/memcpy_generic.S
index edb2e52..43f6a75 100644
--- a/sysdeps/aarch64/multiarch/memcpy_generic.S
+++ b/sysdeps/aarch64/multiarch/memcpy_generic.S
@@ -28,6 +28,10 @@
 # define MEMCPY __memcpy_generic
 # define MEMMOVE __memmove_generic
 
+# ifdef SHARED
+#  define MEMCPY_CHK __memcpy_chk_generic
+# endif
+
 /* Do not hide the generic versions of memcpy and memmove, we use them
    internally.  */
 # undef libc_hidden_builtin_def
@@ -37,6 +41,7 @@
 /* It doesn't make sense to send libc-internal memcpy calls through a PLT. */
 	.globl __GI_memcpy; __GI_memcpy = __memcpy_generic
 	.globl __GI_memmove; __GI_memmove = __memmove_generic
+	.globl __GI___memcpy_chk; __GI___memcpy_chk = __memcpy_chk_generic
 # endif
 
 #endif
diff --git a/sysdeps/aarch64/multiarch/memcpy_thunderx.S b/sysdeps/aarch64/multiarch/memcpy_thunderx.S
index 5ac9e34..2f48290 100644
--- a/sysdeps/aarch64/multiarch/memcpy_thunderx.S
+++ b/sysdeps/aarch64/multiarch/memcpy_thunderx.S
@@ -33,6 +33,7 @@
 #define dstin	x0
 #define src	x1
 #define count	x2
+#define dstlen	x3
 #define dst	x3
 #define srcend	x4
 #define dstend	x5
@@ -80,7 +81,17 @@
 # define MEMMOVE __memmove_thunderx
 # define USE_THUNDERX
 
-ENTRY_ALIGN (MEMMOVE, 6)
+#ifdef SHARED
+#define MEMCPY_CHK __memcpy_chk_thunderx
+ENTRY_ALIGN (MEMCPY_CHK, 6)
+	cmp	dstlen, count
+	b.lo	__chk_fail
+	b	MEMCPY
+	nop
+END (MEMCPY_CHK)
+#endif
+
+ENTRY (MEMMOVE)
 
 	DELOUSE (0)
 	DELOUSE (1)
-- 
2.7.4

References:
- [PATCH 0/2] Multiarch hooks for memcpy variants
  - From: Siddhesh Poyarekar

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