lib: Add initial libc

Signed-off-by: Ian Moffett <ian@osmora.org>

9 files changed, 290 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
index 623226f..1425124 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,6 @@
 *.d
 *.o
+*.a
 *.iso
 *.log
 *.status
diff --git a/builddeps/user.mk b/builddeps/user.mk
new file mode 100644
index 0000000..6c5b028
--- /dev/null
+++ b/builddeps/user.mk
@@ -0,0 +1,6 @@
+CC =
+LIBDIR =
+USRDIR =
+LDSCRIPT =
+INTERNAL_CFLAGS = -T$(LDSCRIPT) -znoexecstack -nostdlib -I$(USRDIR)/include/ \
+				  -L$(USRDIR)/lib -lc
diff --git a/lib/libc/.gitignore b/lib/libc/.gitignore
new file mode 100644
index 0000000..8dbdcdc
--- /dev/null
+++ b/lib/libc/.gitignore
@@ -0,0 +1 @@
+include/sys/
diff --git a/lib/libc/Makefile b/lib/libc/Makefile
new file mode 100644
index 0000000..af91a87
--- /dev/null
+++ b/lib/libc/Makefile
@@ -0,0 +1,28 @@
+CFLAGS = -c -fno-stack-protector -nostdlib -static -Iinclude/
+LIBC_CFILES = $(shell find src/ -name "*.c")
+LIBC_ASMFILES = $(shell find src/ -name "*.S")
+
+LIBC_OBJ = $(LIBC_CFILES:.c=.o)
+LIBC_ASMOBJ = $(LIBC_ASMFILES:.S=.S.o)
+
+all: $(LIBC_ASMOBJ) $(LIBC_OBJ) build/libc.a
+
+build/libc.a: build/
+	mkdir -p include/sys/
+	cp -f $(USRDIR)/include/sys/*.h include/sys
+	ar rcs build/libc.a $(LIBC_OBJ) $(LIBC_ASMOBJ)
+
+%.o: %.c
+	$(CC) $(CFLAGS) -Iinclude/ $< -o $@
+
+%.S.o: %.S
+	$(CC) $(CFLAGS) -Iinclude/ $< -o $@
+
+.PHONY:
+build/:
+	mkdir -p build/
+
+.PHONY: clean
+clean:
+	rm -f $(LIBC_OBJ) $(LIBC_ASMOBJ)
+	rm -rf build/
diff --git a/lib/libc/include/bits/types.h b/lib/libc/include/bits/types.h
new file mode 100644
index 0000000..6d319e8
--- /dev/null
+++ b/lib/libc/include/bits/types.h
@@ -0,0 +1,64 @@
+/*
+ * Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
+ * 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 Hyra 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 OWNER 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.
+ */
+
+#ifndef _BITS_TYPES_H
+#define _BITS_TYPES_H
+
+/* Fixed width integer types */
+typedef unsigned long       __size_t;
+typedef long                __ssize_t;
+typedef long                __ptrdiff_t;
+
+typedef unsigned char       __uint8_t;
+typedef unsigned short      __uint16_t;
+typedef unsigned int        __uint32_t;
+typedef unsigned long long  __uint64_t;
+
+typedef signed char         __int8_t;
+typedef short               __int16_t;
+typedef int                 __int32_t;
+typedef long long           __int64_t;
+
+/* Fixed width integer type limits */
+#define __INT8_MIN        (-0x7F - 1)
+#define __INT16_MIN       (-0x7FFF - 1)
+#define __INT32_MIN       (-0x7FFFFFFF - 1)
+#define __INT64_MIN       (-0x7FFFFFFFFFFFFFFFLL - 1)
+
+#define __INT8_MAX        0x7F
+#define __INT16_MAX       0x7FFF
+#define __INT32_MAX       0x7FFFFFFF
+#define __INT64_MAX       0x7FFFFFFFFFFFFFFFLL
+
+#define __UINT8_MAX       0xFF
+#define __UINT16_MAX      0xFFFF
+#define __UINT32_MAX      0xFFFFFFFFU
+#define __UINT64_MAX      0xFFFFFFFFFFFFFFFFULL
+
+#endif  /* !_BITS_TYPES_H */
diff --git a/lib/libc/include/stddef.h b/lib/libc/include/stddef.h
new file mode 100644
index 0000000..09566f4
--- /dev/null
+++ b/lib/libc/include/stddef.h
@@ -0,0 +1,45 @@
+/*
+ * Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
+ * 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 Hyra 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 OWNER 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.
+ */
+
+#ifndef _STDDEF_H
+#define _STDDEF_H
+
+#include <bits/types.h>
+
+#if __cplusplus >= 201103L
+#define NULL nullptr
+#elif defined(__cplusplus)
+#define NULL 0L
+#else
+#define NULL  ((void *) 0)
+#endif
+
+typedef __size_t size_t;
+
+#endif  /* !_STDDEF_H */
diff --git a/lib/libc/include/stdint.h b/lib/libc/include/stdint.h
new file mode 100644
index 0000000..5f61b18
--- /dev/null
+++ b/lib/libc/include/stdint.h
@@ -0,0 +1,61 @@
+/*
+ * Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
+ * 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 Hyra 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 OWNER 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.
+ */
+
+#ifndef _STDINT_H
+#define _STDINT_H
+
+#include <bits/types.h>
+
+typedef __uint8_t uint8_t;
+typedef __uint16_t uint16_t;
+typedef __uint32_t uint32_t;
+typedef __uint64_t uint64_t;
+typedef __size_t uintptr_t;
+
+typedef __int8_t int8_t;
+typedef __int16_t int16_t;
+typedef __int32_t int32_t;
+typedef __int64_t int64_t;
+
+#define INT8_MIN    __INT8_MIN
+#define INT16_MIN   __INT16_MIN
+#define INT32_MIN   __INT32_MIN
+#define INT64_MIN   __INT64_MIN
+
+#define INT8_MAX    __INT8_MAX
+#define INT16_MAX   __INT16_MAX
+#define INT32_MAX   __INT32_MAX
+#define INT64_MAX   __INT64_MAX
+
+#define UINT8_MAX    __UINT8_MAX
+#define UINT16_MAX   __UINT16_MAX
+#define UINT32_MAX   __UINT32_MAX
+#define UINT64_MAX   __UINT64_MAX
+
+#endif  /* !_STDINT_H */
diff --git a/lib/libc/src/arch/amd64/crt0.S b/lib/libc/src/arch/amd64/crt0.S
new file mode 100644
index 0000000..9dc0cbf
--- /dev/null
+++ b/lib/libc/src/arch/amd64/crt0.S
@@ -0,0 +1,45 @@
+/*
+ * Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
+ * 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 Hyra 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 OWNER 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 <sys/syscall.h>
+
+.text
+.globl _start
+_start:
+    // Mark end of callstack
+    xor %rbp, %rbp
+
+    // Load context and jump to the entry
+    lea (%rsp), %rdi
+    call __libc_entry
+
+    // Exit returning status
+    mov $1, %rax
+    int $0x80
+    ud2
diff --git a/lib/libc/src/main.c b/lib/libc/src/main.c
new file mode 100644
index 0000000..798d667
--- /dev/null
+++ b/lib/libc/src/main.c
@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
+ * 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 Hyra 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 OWNER 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 <stdint.h>
+#include <stddef.h>
+
+int main(int argc, char **argv);
+
+int
+__libc_entry(uint64_t *ctx)
+{
+    return main(0, NULL);
+}