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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [UNIKRAFT RFC PATCH] Added the irq-safe (I hope) memcpy in isrlibc
---
lib/Makefile.uk | 1 +
lib/isrlibc/Config.uk | 16 ++
lib/isrlibc/Makefile.uk | 28 ++++
lib/isrlibc/arch/arm/bits/fcntl.h | 40 +++++
lib/isrlibc/arch/arm64/bits/fcntl.h | 38 +++++
lib/isrlibc/arch/x86_64/bits/fcntl.h | 40 +++++
lib/isrlibc/exportsyms.uk | 2 +
.../include/isrlibc-internal/shareddefs.h | 146 ++++++++++++++++++
lib/isrlibc/include/string.h | 53 +++++++
lib/isrlibc/include/sys/file.h | 21 +++
lib/isrlibc/include/sys/mount.h | 109 +++++++++++++
lib/isrlibc/include/sys/param.h | 38 +++++
lib/isrlibc/include/sys/select.h | 82 ++++++++++
lib/isrlibc/include/sys/stat.h | 135 ++++++++++++++++
lib/isrlibc/include/sys/statfs.h | 36 +++++
lib/isrlibc/include/sys/statvfs.h | 54 +++++++
lib/isrlibc/include/sys/types.h | 69 +++++++++
lib/isrlibc/include/sys/uio.h | 76 +++++++++
lib/isrlibc/string.c | 16 ++
19 files changed, 1000 insertions(+)
create mode 100644 lib/isrlibc/Config.uk
create mode 100644 lib/isrlibc/Makefile.uk
create mode 100644 lib/isrlibc/arch/arm/bits/fcntl.h
create mode 100644 lib/isrlibc/arch/arm64/bits/fcntl.h
create mode 100644 lib/isrlibc/arch/x86_64/bits/fcntl.h
create mode 100644 lib/isrlibc/exportsyms.uk
create mode 100644 lib/isrlibc/include/isrlibc-internal/shareddefs.h
create mode 100644 lib/isrlibc/include/string.h
create mode 100644 lib/isrlibc/include/sys/file.h
create mode 100644 lib/isrlibc/include/sys/mount.h
create mode 100644 lib/isrlibc/include/sys/param.h
create mode 100644 lib/isrlibc/include/sys/select.h
create mode 100644 lib/isrlibc/include/sys/stat.h
create mode 100644 lib/isrlibc/include/sys/statfs.h
create mode 100644 lib/isrlibc/include/sys/statvfs.h
create mode 100644 lib/isrlibc/include/sys/types.h
create mode 100644 lib/isrlibc/include/sys/uio.h
create mode 100644 lib/isrlibc/string.c
diff --git a/lib/Makefile.uk b/lib/Makefile.uk
index aa7e730..b43234b 100644
--- a/lib/Makefile.uk
+++ b/lib/Makefile.uk
@@ -11,6 +11,7 @@ $(eval $(call
_import_lib,$(CONFIG_UK_BASE)/lib/posix-sysinfo))
$(eval $(call _import_lib,$(CONFIG_UK_BASE)/lib/ukdebug))
$(eval $(call _import_lib,$(CONFIG_UK_BASE)/lib/ukargparse))
$(eval $(call _import_lib,$(CONFIG_UK_BASE)/lib/uktimeconv))
+$(eval $(call _import_lib,$(CONFIG_UK_BASE)/lib/isrlibc))
$(eval $(call _import_lib,$(CONFIG_UK_BASE)/lib/nolibc))
$(eval $(call _import_lib,$(CONFIG_UK_BASE)/lib/ukalloc))
$(eval $(call _import_lib,$(CONFIG_UK_BASE)/lib/ukallocbbuddy))
diff --git a/lib/isrlibc/Config.uk b/lib/isrlibc/Config.uk
new file mode 100644
index 0000000..b4d4b5a
--- /dev/null
+++ b/lib/isrlibc/Config.uk
@@ -0,0 +1,16 @@
+menuconfig LIBISRLIBC
+ bool "isrlibc: IRQ-safe subset of libc functionality"
+ depends on !HAVE_LIBC
+ default y if !HAVE_LIBC
+ imply LIBUKTIME
+
+if LIBISRLIBC
+ config LIBISRLIBC_UKDEBUG_ASSERT
+ bool "Implement assertions with libukdebug"
+ default y if LIBUKDEBUG
+ default n
+ help
+ Assertions (`assert()` defined in `<assert.h>`) are
mapped to `UK_ASSERT()`.
+ If selected, please note that libc assertions are also
removed from the code
+ when assertions are disabled in libukdebug.
+endif
diff --git a/lib/isrlibc/Makefile.uk b/lib/isrlibc/Makefile.uk
new file mode 100644
index 0000000..42e0e85
--- /dev/null
+++ b/lib/isrlibc/Makefile.uk
@@ -0,0 +1,28 @@
+$(eval $(call addlib_s,libisrlibc,$(CONFIG_LIBISRLIBC)))
+
+LIBISRLIBC_NO_EXTENDED += -mno-mmx
+LIBISRLIBC_NO_EXTENDED += -mno-sse
+LIBISRLIBC_NO_EXTENDED += -mno-sse2
+LIBISRLIBC_NO_EXTENDED += -mno-sse3
+LIBISRLIBC_NO_EXTENDED += -mno-ssse3
+LIBISRLIBC_NO_EXTENDED += -mno-sse4
+LIBISRLIBC_NO_EXTENDED += -mno-sse4a
+LIBISRLIBC_NO_EXTENDED += -mno-sse4.1
+LIBISRLIBC_NO_EXTENDED += -mno-sse4.2
+LIBISRLIBC_NO_EXTENDED += -mno-avx
+LIBISRLIBC_NO_EXTENDED += -mfpmath=387
+
+CFLAGS-$(CONFIG_LIBISRLIBC) += $(LIBISRLIBC_NO_EXTENDED)
+CXXFLAGS-$(CONFIG_LIBISRLIBC) += $(LIBISRLIBC_NO_EXTENDED)
+
+LIBISRLIBC_GLOBAL_INCLUDES-y += -I$(LIBISRLIBC_BASE)/include
+LIBISRLIBC_GLOBAL_INCLUDES-y += -I$(LIBISRLIBC_BASE)/arch/$(ARCH)
+LIBISRLIBC_GLOBAL_INCLUDES-y += -I$(LIBISRLIBC_BASE)/musl-imported/include
+LIBISRLIBC_GLOBAL_INCLUDES-y +=
-I$(LIBISRLIBC_BASE)/musl-imported/arch/generic
+CINCLUDES-$(CONFIG_LIBISRLIBC) += $(LIBISRLIBC_GLOBAL_INCLUDES-y)
+CXXINCLUDES-$(CONFIG_LIBISRLIBC) += $(LIBISRLIBC_GLOBAL_INCLUDES-y)
+
+LIBISRLIBC_SRCS-y += $(LIBISRLIBC_BASE)/string.c
+
+# Localize internal symbols (starting with __*)
+LIBISRLIBC_OBJCFLAGS-y += -w -L __*
diff --git a/lib/isrlibc/arch/arm/bits/fcntl.h
b/lib/isrlibc/arch/arm/bits/fcntl.h
new file mode 100644
index 0000000..4cb1753
--- /dev/null
+++ b/lib/isrlibc/arch/arm/bits/fcntl.h
@@ -0,0 +1,40 @@
+#define O_CREAT 0100
+#define O_EXCL 0200
+#define O_NOCTTY 0400
+#define O_TRUNC 01000
+#define O_APPEND 02000
+#define O_NONBLOCK 04000
+#define O_DSYNC 010000
+#define O_SYNC 04010000
+#define O_RSYNC 04010000
+#define O_DIRECTORY 040000
+#define O_NOFOLLOW 0100000
+#define O_CLOEXEC 02000000
+
+#define O_ASYNC 020000
+#define O_DIRECT 0200000
+#define O_LARGEFILE 0400000
+#define O_NOATIME 01000000
+#define O_PATH 010000000
+#define O_TMPFILE 020040000
+#define O_NDELAY O_NONBLOCK
+
+#define F_DUPFD 0
+#define F_GETFD 1
+#define F_SETFD 2
+#define F_GETFL 3
+#define F_SETFL 4
+
+#define F_SETOWN 8
+#define F_GETOWN 9
+#define F_SETSIG 10
+#define F_GETSIG 11
+
+#define F_GETLK 12
+#define F_SETLK 13
+#define F_SETLKW 14
+
+#define F_SETOWN_EX 15
+#define F_GETOWN_EX 16
+
+#define F_GETOWNER_UIDS 17
diff --git a/lib/isrlibc/arch/arm64/bits/fcntl.h
b/lib/isrlibc/arch/arm64/bits/fcntl.h
new file mode 100644
index 0000000..9278797
--- /dev/null
+++ b/lib/isrlibc/arch/arm64/bits/fcntl.h
@@ -0,0 +1,38 @@
+#define O_CREAT 0100
+#define O_EXCL 0200
+#define O_NOCTTY 0400
+#define O_TRUNC 01000
+#define O_APPEND 02000
+#define O_NONBLOCK 04000
+#define O_DSYNC 010000
+#define O_SYNC 04010000
+#define O_RSYNC 04010000
+#define O_DIRECTORY 040000
+#define O_NOFOLLOW 0100000
+#define O_CLOEXEC 02000000
+
+#define O_ASYNC 020000
+#define O_DIRECT 0200000
+#define O_LARGEFILE 0400000
+#define O_NOATIME 01000000
+#define O_PATH 010000000
+#define O_TMPFILE 020040000
+#define O_NDELAY O_NONBLOCK
+
+#define F_DUPFD 0
+#define F_GETFD 1
+#define F_SETFD 2
+#define F_GETFL 3
+#define F_SETFL 4
+#define F_GETLK 5
+#define F_SETLK 6
+#define F_SETLKW 7
+#define F_SETOWN 8
+#define F_GETOWN 9
+#define F_SETSIG 10
+#define F_GETSIG 11
+
+#define F_SETOWN_EX 15
+#define F_GETOWN_EX 16
+
+#define F_GETOWNER_UIDS 17
diff --git a/lib/isrlibc/arch/x86_64/bits/fcntl.h
b/lib/isrlibc/arch/x86_64/bits/fcntl.h
new file mode 100644
index 0000000..1b88ad3
--- /dev/null
+++ b/lib/isrlibc/arch/x86_64/bits/fcntl.h
@@ -0,0 +1,40 @@
+#define O_CREAT 0100
+#define O_EXCL 0200
+#define O_NOCTTY 0400
+#define O_TRUNC 01000
+#define O_APPEND 02000
+#define O_NONBLOCK 04000
+#define O_DSYNC 010000
+#define O_SYNC 04010000
+#define O_RSYNC 04010000
+#define O_DIRECTORY 0200000
+#define O_NOFOLLOW 0400000
+#define O_CLOEXEC 02000000
+
+#define O_ASYNC 020000
+#define O_DIRECT 040000
+#define O_LARGEFILE 0
+#define O_NOATIME 01000000
+#define O_PATH 010000000
+#define O_TMPFILE 020200000
+#define O_NDELAY O_NONBLOCK
+
+#define F_DUPFD 0
+#define F_GETFD 1
+#define F_SETFD 2
+#define F_GETFL 3
+#define F_SETFL 4
+
+#define F_SETOWN 8
+#define F_GETOWN 9
+#define F_SETSIG 10
+#define F_GETSIG 11
+
+#define F_GETLK 5
+#define F_SETLK 6
+#define F_SETLKW 7
+
+#define F_SETOWN_EX 15
+#define F_GETOWN_EX 16
+
+#define F_GETOWNER_UIDS 17
diff --git a/lib/isrlibc/exportsyms.uk b/lib/isrlibc/exportsyms.uk
new file mode 100644
index 0000000..5986f7e
--- /dev/null
+++ b/lib/isrlibc/exportsyms.uk
@@ -0,0 +1,2 @@
+# string
+isr_memcpy
diff --git a/lib/isrlibc/include/isrlibc-internal/shareddefs.h
b/lib/isrlibc/include/isrlibc-internal/shareddefs.h
new file mode 100644
index 0000000..d386820
--- /dev/null
+++ b/lib/isrlibc/include/isrlibc-internal/shareddefs.h
@@ -0,0 +1,146 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
+/*
+ * Authors: Florian Schmidt <florian.schmidt@xxxxxxxxx>
+ *
+ * Copyright (c) 2018, NEC Labs Europe, NEC Corporation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the copyright holder nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * THIS HEADER MAY NOT BE EXTRACTED OR MODIFIED IN ANY WAY.
+ */
+
+/* This header does by design not have include guards, so that it can be
+ * included from multiple files. The __NEED_x macros instead make sure that
+ * only those definitions are included that are required by that specific
+ * file, and only if they haven't been defined on a previous pass through
+ * this file.
+ */
+
+#include <uk/config.h>
+#include <uk/arch/types.h>
+
+#if (defined __NEED_NULL && !defined __DEFINED_NULL)
+#ifdef __cplusplus
+#define NULL 0L
+#else
+#define NULL ((void *) 0)
+#endif
+#define __DEFINED__NULL
+#endif
+
+#if (defined __NEED_size_t && !defined __DEFINED_size_t)
+typedef __sz size_t;
+#define __DEFINED_size_t
+#endif
+
+#if (defined __NEED_ssize_t && !defined __DEFINED_ssize_t)
+typedef __ssz ssize_t;
+#define __DEFINED_ssize_t
+#endif
+
+#if (defined __NEED_off_t && !defined __DEFINED_off_t)
+typedef __off off_t;
+#define __DEFINED_off_t
+#endif
+
+#if CONFIG_HAVE_TIME
+#include <uk/time_types.h>
+#endif
+
+#if (defined __NEED_mode_t && !defined __DEFINED_mode_t)
+typedef unsigned mode_t;
+#define __DEFINED_mode_t
+#endif
+
+#if defined(__NEED_uid_t) && !defined(__DEFINED_uid_t)
+typedef unsigned uid_t;
+#define __DEFINED_uid_t
+#endif
+
+#if defined(__NEED_gid_t) && !defined(__DEFINED_gid_t)
+typedef unsigned gid_t;
+#define __DEFINED_gid_t
+#endif
+
+#if defined(__NEED_useconds_t) && !defined(__DEFINED_useconds_t)
+typedef unsigned useconds_t;
+#define __DEFINED_useconds_t
+#endif
+
+#if defined(__NEED_pid_t) && !defined(__DEFINED_pid_t)
+typedef int pid_t;
+#define __DEFINED_pid_t
+#endif
+
+#if defined(__NEED_id_t) && !defined(__DEFINED_id_t)
+typedef unsigned id_t;
+#define __DEFINED_id_t
+#endif
+
+#if defined(__NEED_dev_t) && !defined(__DEFINED_dev_t)
+typedef __u64 dev_t;
+#define __DEFINED_dev_t
+#endif
+
+#if defined(__NEED_ino_t) && !defined(__DEFINED_ino_t)
+typedef __u64 ino_t;
+#define __DEFINED_ino_t
+#endif
+
+#if defined(__NEED_nlink_t) && !defined(__DEFINED_nlink_t)
+typedef __u32 nlink_t;
+#define __DEFINED_nlink_t
+#endif
+
+#if defined(__NEED_blkcnt_t) && !defined(__DEFINED_blkcnt_t)
+typedef __s64 blkcnt_t;
+#define __DEFINED_blkcnt_t
+#endif
+
+#if defined(__NEED_blksize_t) && !defined(__DEFINED_blksize_t)
+typedef long blksize_t;
+#define __DEFINED_blksize_t
+#endif
+
+#if defined(__NEED_locale_t) && !defined(__DEFINED_locale_t)
+typedef struct __locale_struct *locale_t;
+#define __DEFINED_locale_t
+#endif
+
+#if defined(__NEED_struct_iovec) && !defined(__DEFINED_struct_iovec)
+struct iovec { void *iov_base; size_t iov_len; };
+#define __DEFINED_struct_iovec
+#endif
+
+#if defined(__NEED_fsblkcnt_t) && !defined(__DEFINED_fsblkcnt_t)
+typedef unsigned long long fsblkcnt_t;
+#define __DEFINED_fsblkcnt_t
+#endif
+
+#if defined(__NEED_fsfilcnt_t) && !defined(__DEFINED_fsfilcnt_t)
+typedef unsigned long long fsfilcnt_t;
+#define __DEFINED_fsfilcnt_t
+#endif
diff --git a/lib/isrlibc/include/string.h b/lib/isrlibc/include/string.h
new file mode 100644
index 0000000..84e4acf
--- /dev/null
+++ b/lib/isrlibc/include/string.h
@@ -0,0 +1,53 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
+/*
+ * Authors: Simon Kuenzer <simon.kuenzer@xxxxxxxxx>
+ *
+ *
+ * Copyright (c) 2017, NEC Europe Ltd., NEC Corporation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the copyright holder nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * THIS HEADER MAY NOT BE EXTRACTED OR MODIFIED IN ANY WAY.
+ */
+
+#ifndef __STRING_H__
+#define __STRING_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define __NEED_NULL
+#define __NEED_size_t
+#include <isrlibc-internal/shareddefs.h>
+
+void *memcpy_isr(void *dst, const void *src, size_t len);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __STRING_H__ */
diff --git a/lib/isrlibc/include/sys/file.h b/lib/isrlibc/include/sys/file.h
new file mode 100644
index 0000000..4fc83b9
--- /dev/null
+++ b/lib/isrlibc/include/sys/file.h
@@ -0,0 +1,21 @@
+#ifndef _SYS_FILE_H
+#define _SYS_FILE_H
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define LOCK_SH 1
+#define LOCK_EX 2
+#define LOCK_NB 4
+#define LOCK_UN 8
+
+#define L_SET 0
+#define L_INCR 1
+#define L_XTND 2
+
+int flock(int, int);
+
+#ifdef __cplusplus
+}
+#endif
+#endif
diff --git a/lib/isrlibc/include/sys/mount.h b/lib/isrlibc/include/sys/mount.h
new file mode 100644
index 0000000..c8b1fe2
--- /dev/null
+++ b/lib/isrlibc/include/sys/mount.h
@@ -0,0 +1,109 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
+/*
+ * Copyright (C) 2013 Cloudius Systems, Ltd.
+ * Copyright (c) 2019, NEC Europe Ltd., NEC Corporation.
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the copyright holder nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * THIS HEADER MAY NOT BE EXTRACTED OR MODIFIED IN ANY WAY.
+ */
+
+#ifndef _SYS_MOUNT_H
+#define _SYS_MOUNT_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+#define BLKROSET _IO(0x12, 93)
+#define BLKROGET _IO(0x12, 94)
+#define BLKRRPART _IO(0x12, 95)
+#define BLKGETSIZE _IO(0x12, 96)
+#define BLKFLSBUF _IO(0x12, 97)
+#define BLKRASET _IO(0x12, 98)
+#define BLKRAGET _IO(0x12, 99)
+#define BLKFRASET _IO(0x12, 100)
+#define BLKFRAGET _IO(0x12, 101)
+#define BLKSECTSET _IO(0x12, 102)
+#define BLKSECTGET _IO(0x12, 103)
+#define BLKSSZGET _IO(0x12, 104)
+#define BLKBSZGET _IOR(0x12, 112, size_t)
+#define BLKBSZSET _IOW(0x12, 113, size_t)
+#define BLKGETSIZE64 _IOR(0x12, 114, size_t)
+
+#define MS_RDONLY 1
+#define MS_NOSUID 2
+#define MS_NODEV 4
+#define MS_NOEXEC 8
+#define MS_SYNCHRONOUS 16
+#define MS_REMOUNT 32
+#define MS_MANDLOCK 64
+#define MS_DIRSYNC 128
+#define MS_NOATIME 1024
+#define MS_NODIRATIME 2048
+#define MS_BIND 4096
+#define MS_MOVE 8192
+#define MS_REC 16384
+#define MS_SILENT 32768
+#define MS_POSIXACL (1<<16)
+#define MS_UNBINDABLE (1<<17)
+#define MS_PRIVATE (1<<18)
+#define MS_SLAVE (1<<19)
+#define MS_SHARED (1<<20)
+#define MS_RELATIME (1<<21)
+#define MS_KERNMOUNT (1<<22)
+#define MS_I_VERSION (1<<23)
+#define MS_STRICTATIME (1<<24)
+#define MS_LAZYTIME (1<<25)
+#define MS_NOREMOTELOCK (1<<27)
+#define MS_NOSEC (1<<28)
+#define MS_BORN (1<<29)
+#define MS_ACTIVE (1<<30)
+#define MS_NOUSER (1U<<31)
+
+#define MS_RMT_MASK
(MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_I_VERSION|MS_LAZYTIME)
+
+#define MS_MGC_VAL 0xc0ed0000
+#define MS_MGC_MSK 0xffff0000
+
+#define MNT_FORCE 0x00000001
+#define MNT_DETACH 0x00000002
+#define MNT_EXPIRE 0x00000004
+#define UMOUNT_NOFOLLOW 0x00000008
+
+int mount(const char *dev, const char *dir, const char *fsname,
+ unsigned long flags, const void *data);
+int umount(const char *path);
+int umount2(const char *path, int flags);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/lib/isrlibc/include/sys/param.h b/lib/isrlibc/include/sys/param.h
new file mode 100644
index 0000000..f5928d0
--- /dev/null
+++ b/lib/isrlibc/include/sys/param.h
@@ -0,0 +1,38 @@
+#ifndef _SYS_PARAM_H
+#define _SYS_PARAM_H
+
+#define MAXSYMLINKS 20
+#define MAXHOSTNAMELEN 64
+#define MAXNAMLEN 255
+#define MAXPATHLEN 4096
+#define NBBY 8
+#define NGROUPS 32
+#define CANBSIZ 255
+#define NOFILE 256
+#define NCARGS 131072
+#define DEV_BSIZE 512
+#define NOGROUP (-1)
+
+#undef MIN
+#undef MAX
+#define MIN(a, b) (((a) < (b)) ? (a) : (b))
+#define MAX(a, b) (((a) > (b)) ? (a) : (b))
+
+#define __bitop(x, i, o) ((x)[(i) / 8] o(1 << (i) % 8))
+#define setbit(x, i) __bitop(x, i, |=)
+#define clrbit(x, i) __bitop(x, i, &= ~)
+#define isset(x, i) __bitop(x, i, &)
+#define isclr(x, i) !isset(x, i)
+
+#define howmany(n, d) (((n) + ((d) - 1)) / (d))
+#define roundup(n, d) (howmany(n, d) * (d))
+#define powerof2(n) !(((n) - 1) & (n))
+
+/* TODO: This includes are not needed currently. Lets leave them
+ * commented out as a reminder
+ */
+/* #include <sys/resource.h> */
+/* #include <endian.h> */
+#include <limits.h>
+
+#endif
diff --git a/lib/isrlibc/include/sys/select.h b/lib/isrlibc/include/sys/select.h
new file mode 100644
index 0000000..e981b7c
--- /dev/null
+++ b/lib/isrlibc/include/sys/select.h
@@ -0,0 +1,82 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
+/*
+ * Copyright (c) 1992, 1993
+ * The Regents of the University of California. All rights reserved.
+ * Copyright (c) 2017, NEC Europe Ltd., NEC Corporation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+/* Derived from FreeBSD commit 4736ccf (Nov 20, 2017) */
+
+#ifndef __SYS_SELECT_H__
+#define __SYS_SELECT_H__
+
+#include <sys/param.h>
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define __NEED_time_t
+#define __NEED_suseconds_t
+#define __NEED_struct_timespec
+#include <nolibc-internal/shareddefs.h>
+
+typedef unsigned long __fd_mask;
+
+/*
+ * Select uses bit masks of file descriptors in longs. These macros
+ * manipulate such bit fields (the filesystem macros use chars).
+ * FD_SETSIZE may be defined by the user, but the default here should
+ * be enough for most uses.
+ */
+#ifndef FD_SETSIZE
+#define FD_SETSIZE 64
+#endif
+
+#define _NFDBITS (sizeof(__fd_mask) * 8) /* bits per mask */
+
+typedef struct fd_set {
+ __fd_mask __fds_bits[howmany(FD_SETSIZE, _NFDBITS)];
+} fd_set;
+
+#define __fdset_mask(n) ((__fd_mask)1 << ((n) % _NFDBITS))
+#define FD_CLR(n, p) ((p)->__fds_bits[(n)/_NFDBITS] &=
~__fdset_mask(n))
+#define FD_ISSET(n, p) (((p)->__fds_bits[(n)/_NFDBITS] &
__fdset_mask(n)) != 0)
+#define FD_SET(n, p) ((p)->__fds_bits[(n)/_NFDBITS] |=
__fdset_mask(n))
+#define FD_ZERO(p) do { \
+ fd_set *_p; \
+ __ssz _n; \
+ \
+ _p = (p); \
+ _n = howmany(FD_SETSIZE, _NFDBITS); \
+ while (_n > 0) \
+ _p->__fds_bits[--_n] = 0; \
+} while (0)
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __SYS_SELECT_H__ */
diff --git a/lib/isrlibc/include/sys/stat.h b/lib/isrlibc/include/sys/stat.h
new file mode 100644
index 0000000..407bc20
--- /dev/null
+++ b/lib/isrlibc/include/sys/stat.h
@@ -0,0 +1,135 @@
+#ifndef _SYS_STAT_H
+#define _SYS_STAT_H
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* #include <features.h> */
+
+#define __NEED_dev_t
+#define __NEED_ino_t
+#define __NEED_mode_t
+#define __NEED_nlink_t
+#define __NEED_uid_t
+#define __NEED_gid_t
+#define __NEED_off_t
+#define __NEED_time_t
+#define __NEED_blksize_t
+#define __NEED_blkcnt_t
+#define __NEED_struct_timespec
+
+#include <nolibc-internal/shareddefs.h>
+
+struct stat {
+ dev_t st_dev;
+ ino_t st_ino;
+ nlink_t st_nlink;
+
+ mode_t st_mode;
+ uid_t st_uid;
+ gid_t st_gid;
+ unsigned int __pad0;
+ dev_t st_rdev;
+ off_t st_size;
+ blksize_t st_blksize;
+ blkcnt_t st_blocks;
+
+ struct timespec st_atim;
+ struct timespec st_mtim;
+ struct timespec st_ctim;
+};
+
+#define st_atime st_atim.tv_sec
+#define st_mtime st_mtim.tv_sec
+#define st_ctime st_ctim.tv_sec
+
+#define S_IFMT 0170000
+
+#define S_IFDIR 0040000
+#define S_IFCHR 0020000
+#define S_IFBLK 0060000
+#define S_IFREG 0100000
+#define S_IFIFO 0010000
+#define S_IFLNK 0120000
+#define S_IFSOCK 0140000
+
+#define S_TYPEISMQ(buf) 0
+#define S_TYPEISSEM(buf) 0
+#define S_TYPEISSHM(buf) 0
+#define S_TYPEISTMO(buf) 0
+
+#define S_ISDIR(mode) (((mode) & S_IFMT) == S_IFDIR)
+#define S_ISCHR(mode) (((mode) & S_IFMT) == S_IFCHR)
+#define S_ISBLK(mode) (((mode) & S_IFMT) == S_IFBLK)
+#define S_ISREG(mode) (((mode) & S_IFMT) == S_IFREG)
+#define S_ISFIFO(mode) (((mode) & S_IFMT) == S_IFIFO)
+#define S_ISLNK(mode) (((mode) & S_IFMT) == S_IFLNK)
+#define S_ISSOCK(mode) (((mode) & S_IFMT) == S_IFSOCK)
+
+#ifndef S_IRUSR
+#define S_ISUID 04000
+#define S_ISGID 02000
+#define S_ISVTX 01000
+#define S_IRUSR 0400
+#define S_IWUSR 0200
+#define S_IXUSR 0100
+#define S_IRWXU 0700
+#define S_IRGRP 0040
+#define S_IWGRP 0020
+#define S_IXGRP 0010
+#define S_IRWXG 0070
+#define S_IROTH 0004
+#define S_IWOTH 0002
+#define S_IXOTH 0001
+#define S_IRWXO 0007
+#endif
+
+#define UTIME_NOW 0x3fffffff
+#define UTIME_OMIT 0x3ffffffe
+
+int stat(const char *__restrict, struct stat *__restrict);
+int fstat(int, struct stat *);
+int lstat(const char *__restrict, struct stat *__restrict);
+int fstatat(int, const char *__restrict, struct stat *__restrict, int);
+int chmod(const char *, mode_t);
+int fchmod(int, mode_t);
+int fchmodat(int, const char *, mode_t, int);
+mode_t umask(mode_t);
+int mkdir(const char *, mode_t);
+int mkfifo(const char *, mode_t);
+int mkdirat(int, const char *, mode_t);
+int mkfifoat(int, const char *, mode_t);
+
+#if defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
+int mknod(const char *, mode_t, dev_t);
+int mknodat(int, const char *, mode_t, dev_t);
+#endif
+
+int futimens(int, const struct timespec [2]);
+int utimensat(int, const char *, const struct timespec [2], int);
+
+#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
+int lchmod(const char *, mode_t);
+#define S_IREAD S_IRUSR
+#define S_IWRITE S_IWUSR
+#define S_IEXEC S_IXUSR
+#endif
+
+#if defined(_LARGEFILE64_SOURCE) || defined(_GNU_SOURCE)
+#define stat64 stat
+#define fstat64 fstat
+#define lstat64 lstat
+#define fstatat64 fstatat
+#define blkcnt64_t blkcnt_t
+#define fsblkcnt64_t fsblkcnt_t
+#define fsfilcnt64_t fsfilcnt_t
+#define ino64_t ino_t
+#define off64_t off_t
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+#endif
+
+
diff --git a/lib/isrlibc/include/sys/statfs.h b/lib/isrlibc/include/sys/statfs.h
new file mode 100644
index 0000000..59de629
--- /dev/null
+++ b/lib/isrlibc/include/sys/statfs.h
@@ -0,0 +1,36 @@
+#ifndef _SYS_STATFS_H
+#define _SYS_STATFS_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <sys/statvfs.h>
+
+typedef struct __fsid_t {
+ int __val[2];
+} fsid_t;
+
+struct statfs {
+ unsigned long f_type, f_bsize;
+ fsblkcnt_t f_blocks, f_bfree, f_bavail;
+ fsfilcnt_t f_files, f_ffree;
+ fsid_t f_fsid;
+ unsigned long f_namelen, f_frsize, f_flags, f_spare[4];
+};
+
+int statfs(const char *path, struct statfs *buf);
+int fstatfs(int fd, struct statfs *buf);
+
+#if defined(_LARGEFILE64_SOURCE) || defined(_GNU_SOURCE)
+#define statfs64 statfs
+#define fstatfs64 fstatfs
+#define fsblkcnt64_t fsblkcnt_t
+#define fsfilcnt64_t fsfilcnt_t
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/lib/isrlibc/include/sys/statvfs.h
b/lib/isrlibc/include/sys/statvfs.h
new file mode 100644
index 0000000..85a2ff9
--- /dev/null
+++ b/lib/isrlibc/include/sys/statvfs.h
@@ -0,0 +1,54 @@
+#ifndef _SYS_STATVFS_H
+#define _SYS_STATVFS_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define __NEED_fsblkcnt_t
+#define __NEED_fsfilcnt_t
+#include <nolibc-internal/shareddefs.h>
+
+struct statvfs {
+ unsigned long f_bsize, f_frsize;
+ fsblkcnt_t f_blocks, f_bfree, f_bavail;
+ fsfilcnt_t f_files, f_ffree, f_favail;
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+ unsigned long f_fsid;
+ unsigned :8*(2*sizeof(int)-sizeof(long));
+#else
+ unsigned :8*(2*sizeof(int)-sizeof(long));
+ unsigned long f_fsid;
+#endif
+ unsigned long f_flag, f_namemax;
+ int __reserved[6];
+};
+
+int statvfs (const char *__restrict, struct statvfs *__restrict);
+int fstatvfs (int, struct statvfs *);
+
+#define ST_RDONLY 1
+#define ST_NOSUID 2
+#define ST_NODEV 4
+#define ST_NOEXEC 8
+#define ST_SYNCHRONOUS 16
+#define ST_MANDLOCK 64
+#define ST_WRITE 128
+#define ST_APPEND 256
+#define ST_IMMUTABLE 512
+#define ST_NOATIME 1024
+#define ST_NODIRATIME 2048
+#define ST_RELATIME 4096
+
+#if defined(_LARGEFILE64_SOURCE) || defined(_GNU_SOURCE)
+#define statvfs64 statvfs
+#define fstatvfs64 fstatvfs
+#define fsblkcnt64_t fsblkcnt_t
+#define fsfilcnt64_t fsfilcnt_t
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/lib/isrlibc/include/sys/types.h b/lib/isrlibc/include/sys/types.h
new file mode 100644
index 0000000..4da777c
--- /dev/null
+++ b/lib/isrlibc/include/sys/types.h
@@ -0,0 +1,69 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
+/*
+ * Authors: Simon Kuenzer <simon.kuenzer@xxxxxxxxx>
+ *
+ *
+ * Copyright (c) 2017, NEC Europe Ltd., NEC Corporation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the copyright holder nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * THIS HEADER MAY NOT BE EXTRACTED OR MODIFIED IN ANY WAY.
+ */
+
+
+#ifndef __SYS_TYPES_H__
+#define __SYS_TYPES_H__
+
+#include <uk/arch/types.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define __NEED_size_t
+#define __NEED_ssize_t
+#define __NEED_off_t
+#define __NEED_time_t
+#define __NEED_timer_t
+#define __NEED_suseconds_t
+#define __NEED_clock_t
+#define __NEED_clockid_t
+#define __NEED_locale_t
+#define __NEED_mode_t
+#define __NEED_uid_t
+#define __NEED_gid_t
+#define __NEED_pid_t
+#define __NEED_id_t
+#define __NEED_dev_t
+#define __NEED_ino_t
+#define __NEED_nlink_t
+#include <nolibc-internal/shareddefs.h>
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __SYS_TYPES_H__ */
diff --git a/lib/isrlibc/include/sys/uio.h b/lib/isrlibc/include/sys/uio.h
new file mode 100644
index 0000000..d1a4b48
--- /dev/null
+++ b/lib/isrlibc/include/sys/uio.h
@@ -0,0 +1,76 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
+/*
+ * Copyright (C) 2013 Cloudius Systems, Ltd.
+ * Copyright (c) 2019, NEC Europe Ltd., NEC Corporation.
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the copyright holder nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * THIS HEADER MAY NOT BE EXTRACTED OR MODIFIED IN ANY WAY.
+ */
+
+#ifndef _SYS_UIO_H
+#define _SYS_UIO_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define __NEED_size_t
+#define __NEED_ssize_t
+#define __NEED_struct_iovec
+
+#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
+#define __NEED_off_t
+#endif
+
+#ifdef _GNU_SOURCE
+#define __NEED_pid_t
+#endif
+
+#include <nolibc-internal/shareddefs.h>
+
+#define UIO_MAXIOV 1024
+
+ssize_t readv(int fd, const struct iovec *iov, int iovcnt);
+ssize_t writev(int fd, const struct iovec *iov, int iovcnt);
+
+#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
+ssize_t preadv(int fd, const struct iovec *iov, int iovcnt, off_t offset);
+ssize_t pwritev(int fd, const struct iovec *iov, int iovcnt, off_t offset);
+#if defined(_LARGEFILE64_SOURCE) || defined(_GNU_SOURCE)
+#define preadv64 preadv
+#define pwritev64 pwritev
+#define off64_t off_t
+#endif
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/lib/isrlibc/string.c b/lib/isrlibc/string.c
new file mode 100644
index 0000000..8425202
--- /dev/null
+++ b/lib/isrlibc/string.c
@@ -0,0 +1,16 @@
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+#include <limits.h>
+#include <errno.h>
+#include <stdio.h>
+
+void *memcpy_isr(void *dst, const void *src, size_t len)
+{
+ size_t p;
+
+ for (p = 0; p < len; ++p)
+ *((__u8 *)(((__uptr)dst) + p)) = *((__u8 *)(((__uptr)src) + p));
+
+ return dst;
+}
\ No newline at end of file
--
2.25.1
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