lib: add libc and micro libc

lib/libc/CMakeLists.txt

@@ -0,0 +1,36 @@
+set(source_dirs string stdio)
+foreach (dir ${source_dirs})
+	file(GLOB dir_sources ${CMAKE_CURRENT_SOURCE_DIR}/${dir}/*.c)
+	file(GLOB dir_headers ${CMAKE_CURRENT_SOURCE_DIR}/${dir}/*.h)
+
+	set(sources ${sources} ${dir_sources})
+	set(headers ${headers} ${dir_headers})
+endforeach (dir)
+
+file(GLOB runtime_sources
+	${CMAKE_CURRENT_SOURCE_DIR}/runtime/${CMAKE_SYSTEM_PROCESSOR}/*.s)
+set_property(SOURCE ${runtime_sources} PROPERTY LANGUAGE C)
+
+set(public_include_dirs
+	${CMAKE_CURRENT_SOURCE_DIR}/include)
+
+rosetta_add_library(SHARED
+	NAME libc
+	PUBLIC_INCLUDE_DIRS ${public_include_dirs}
+	SOURCES ${sources}
+	HEADERS ${headers})
+
+rosetta_add_object_library(
+	NAME libc-rt STATIC
+	SOURCES ${runtime_sources})
+
+sysroot_add_library(
+	NAME libc
+	HEADER_DIR /usr/include
+	LIB_DIR /usr/lib)
+sysroot_add_object_library(
+	NAME libc-rt
+	LIB_DIR /usr/lib)
+bsp_add_library(
+	NAME libc
+	LIB_DIR /usr/lib)

lib/libc/include/stdio.h

@@ -0,0 +1,22 @@
+#ifndef STDIO_H_
+#define STDIO_H_
+
+#include <stdarg.h>
+#include <stddef.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern int snprintf(char *buffer, size_t count, const char *format, ...);
+extern int vsnprintf(
+	char *buffer,
+	size_t count,
+	const char *format,
+	va_list va);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

lib/libc/include/string.h

@@ -0,0 +1,14 @@
+#ifndef STRING_H_
+#define STRING_H_
+
+#include <stddef.h>
+
+extern size_t strlen(const char *s);
+
+extern int strcmp(const char *s1, const char *s2);
+extern int strncmp(const char *s1, const char *s2, unsigned long n);
+
+extern void *memset(void *str, int c, size_t n);
+extern void *memcpy(void *dst, const void *src, size_t len);
+
+#endif

lib/libc/runtime/x86_64/crt0.s

@@ -0,0 +1,16 @@
+.code64
+
+.global _start
+.type _start, @function
+
+.extern main
+.type main, @function
+
+_start:
+	# Args (as provided by the ABI)
+	# %rdi: int argc
+	# %rsi: const char **argv
+	# %rdx: kern_handle_t task
+	# %rcx: kern_handle_t address_space
+	call main
+1:	jmp 1b

lib/libc/string/memcpy.c

@@ -0,0 +1,107 @@
+/*-
+ * Copyright (c) 1990, 1993
+ *  The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Chris Torek.
+ *
+ * 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.
+ * 4. 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.
+ */
+#include <stddef.h>
+#include <stdint.h>
+
+typedef uintptr_t word;
+#define wsize sizeof(word)
+#define wmask (wsize - 1)
+
+void *memcpy(void *dst0, const void *src0, size_t length)
+{
+	char *dst = dst0;
+	const char *src = src0;
+	size_t t;
+
+	if (length == 0 || dst == src) /* nothing to do */
+		goto done;
+
+	/*
+	 * Macros: loop-t-times; and loop-t-times, t>0
+	 */
+#define TLOOP(s)                                                               \
+	if (t)                                                                 \
+	TLOOP1(s)
+#define TLOOP1(s)                                                              \
+	do {                                                                   \
+		s;                                                             \
+	} while (--t)
+
+	if ((uintptr_t)dst < (uintptr_t)src) {
+		/*
+		 * Copy forward.
+		 */
+		t = (uintptr_t)src; /* only need low bits */
+		if ((t | (uintptr_t)dst) & wmask) {
+			/*
+			 * Try to align operands.  This cannot be done
+			 * unless the low bits match.
+			 */
+			if ((t ^ (uintptr_t)dst) & wmask || length < wsize)
+				t = length;
+			else
+				t = wsize - (t & wmask);
+			length -= t;
+			TLOOP1(*dst++ = *src++);
+		}
+		/*
+		 * Copy whole words, then mop up any trailing bytes.
+		 */
+		t = length / wsize;
+		TLOOP(*(word *)dst = *(word *)src; src += wsize; dst += wsize);
+		t = length & wmask;
+		TLOOP(*dst++ = *src++);
+	} else {
+		/*
+		 * Copy backwards.  Otherwise essentially the same.
+		 * Alignment works as before, except that it takes
+		 * (t&wmask) bytes to align, not wsize-(t&wmask).
+		 */
+		src += length;
+		dst += length;
+		t = (uintptr_t)src;
+		if ((t | (uintptr_t)dst) & wmask) {
+			if ((t ^ (uintptr_t)dst) & wmask || length <= wsize)
+				t = length;
+			else
+				t &= wmask;
+			length -= t;
+			TLOOP1(*--dst = *--src);
+		}
+		t = length / wsize;
+		TLOOP(src -= wsize; dst -= wsize; *(word *)dst = *(word *)src);
+		t = length & wmask;
+		TLOOP(*--dst = *--src);
+	}
+done:
+	return (dst0);
+}

lib/libc/string/memset.c

@@ -0,0 +1,13 @@
+#include <stddef.h>
+
+void *memset(void *str, int c, size_t n)
+{
+	unsigned char val = (unsigned char)c;
+	unsigned char *buf = str;
+
+	for (size_t i = 0; i < n; i++) {
+		buf[i] = val;
+	}
+
+	return str;
+}

lib/libc/string/strcmp.c

@@ -0,0 +1,21 @@
+int strcmp(const char *s1, const char *s2)
+{
+	int i;
+	for (i = 0; s1[i] == s2[i]; i++)
+		if (s1[i] == '\0')
+			return 0;
+
+	return s1[i] - s2[i];
+}
+
+int strncmp(const char *s1, const char *s2, unsigned long n)
+{
+	for (; n > 0; s1++, s2++, --n)
+		if (*s1 != *s2)
+			return ((*(unsigned char *)s1 < *(unsigned char *)s2)
+			                ? -1
+			                : 1);
+		else if (*s1 == '\0')
+			return 0;
+	return 0;
+}

lib/libc/string/strlen.c

@@ -0,0 +1,11 @@
+#include <string.h>
+
+size_t strlen(const char *str)
+{
+	size_t res = 0;
+	while (str[res]) {
+		res++;
+	}
+
+	return res;
+}