kern: use optimized memcmp/memcpy implementations

libraries/libmesosphere/source/libc/kern_libc_config.arch.arm64.h

@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) 2018-2020 Atmosphère-NX
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#pragma once
+
+/* Definitions for libc genericity. */
+#define MESOSPHERE_LIBC_MEMCPY_GENERIC  0
+#define MESOSPHERE_LIBC_MEMCMP_GENERIC  0
+#define MESOSPHERE_LIBC_MEMMOVE_GENERIC 0
+#define MESOSPHERE_LIBC_MEMSET_GENERIC  1
+#define MESOSPHERE_LIBC_STRNCPY_GENERIC 1
+#define MESOSPHERE_LIBC_STRNCMP_GENERIC 1

libraries/libmesosphere/source/libc/kern_libc_config.h

@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2018-2020 Atmosphère-NX
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#pragma once
+
+#if defined(ATMOSPHERE_ARCH_ARM64)
+
+    #include "kern_libc_config.arch.arm64.h"
+
+#else
+
+    #error "Unknown architecture for libc"
+
+#endif

libraries/libmesosphere/source/libc/kern_libc_generic.c

@@ -16,6 +16,7 @@
 #include <string.h>
 #include <stddef.h>
 #include <limits.h>
+#include "kern_libc_config.h"
 
 /* Note: copied from newlib */
 #ifdef __cplusplus
@@ -58,6 +59,8 @@ QUICKREF
 #undef TOO_SMALL
 #define TOO_SMALL(LEN)  ((LEN) < BIGBLOCKSIZE)
 
+#if MESOSPHERE_LIBC_MEMMOVE_GENERIC
+
 /*SUPPRESS 20*/
 void *
 //__inhibit_loop_to_libcall
@@ -147,6 +150,8 @@ memmove (void *dst_void,
 #endif /* not PREFER_SIZE_OVER_SPEED */
 }
 
+#endif /* MESOSPHERE_LIBC_MEMMOVE_GENERIC */
+
 /*
 FUNCTION
         <<memcpy>>---copy memory regions
@@ -169,6 +174,8 @@ QUICKREF
         memcpy ansi pure
 	*/
 
+#if MESOSPHERE_LIBC_MEMCPY_GENERIC
+
 void *
 __attribute__((weak))
 memcpy (void * dst0,
@@ -229,6 +236,8 @@ memcpy (void * dst0,
 #endif /* not PREFER_SIZE_OVER_SPEED */
 }
 
+#endif /* MESOSPHERE_LIBC_MEMCPY_GENERIC */
+
 /*
 FUNCTION
 	<<memset>>---set an area of memory
@@ -260,6 +269,8 @@ QUICKREF
 #define UNALIGNED(X)   ((long)X & (LBLOCKSIZE - 1))
 #define TOO_SMALL(LEN) ((LEN) < LBLOCKSIZE)
 
+#if MESOSPHERE_LIBC_MEMSET_GENERIC
+
 void *
 __attribute__((weak))
 memset (void *m,
@@ -322,6 +333,8 @@ memset (void *m,
   return m;
 }
 
+#endif /* MESOSPHERE_LIBC_MEMSET_GENERIC */
+
 /*
 FUNCTION
 	<<memcmp>>---compare two memory areas
@@ -359,6 +372,8 @@ QUICKREF
 /* Threshhold for punting to the byte copier.  */
 #define TOO_SMALL(LEN)  ((LEN) < LBLOCKSIZE)
 
+#if MESOSPHERE_LIBC_MEMCMP_GENERIC
+
 int
 __attribute__((weak))
 memcmp (const void *m1,
@@ -421,6 +436,8 @@ memcmp (const void *m1,
 #endif /* not PREFER_SIZE_OVER_SPEED */
 }
 
+#endif /* MESOSPHERE_LIBC_MEMCMP_GENERIC */
+
 /*
 FUNCTION
 	<<strncpy>>---counted copy string
@@ -475,6 +492,8 @@ QUICKREF
 #undef TOO_SMALL
 #define TOO_SMALL(LEN) ((LEN) < sizeof (long))
 
+#if MESOSPHERE_LIBC_STRNCMP_GENERIC
+
 char *
 strncpy (char *__restrict dst0,
 	const char *__restrict src0,
@@ -534,6 +553,8 @@ strncpy (char *__restrict dst0,
 #endif /* not PREFER_SIZE_OVER_SPEED */
 }
 
+#endif /* MESOSPHERE_LIBC_STRNCPY_GENERIC */
+
 /*
 FUNCTION
 	<<strncmp>>---character string compare
@@ -581,6 +602,8 @@ QUICKREF
 #error long int is not a 32bit or 64bit byte
 #endif
 
+#if MESOSPHERE_LIBC_STRNCMP_GENERIC
+
 int
 strncmp (const char *s1,
 	const char *s2,
@@ -643,6 +666,8 @@ strncmp (const char *s1,
 #endif /* not PREFER_SIZE_OVER_SPEED */
 }
 
+#endif /* MESOSPHERE_LIBC_STRNCMP_GENERIC */
+
 #ifdef __cplusplus
 } /* extern "C" */
 #endif