Initial Commit

user/.vscode/c_cpp_properties.json

@@ -0,0 +1,18 @@
+{
+  "configurations": [
+    {
+      "name": "linux-gcc-x64",
+      "includePath": [
+        "${workspaceFolder}/**"
+      ],
+      "compilerPath": "/usr/bin/gcc",
+      "cStandard": "gnu11",
+      "cppStandard": "${default}",
+      "intelliSenseMode": "linux-gcc-x64",
+      "compilerArgs": [
+        ""
+      ]
+    }
+  ],
+  "version": 4
+}

user/.vscode/launch.json

@@ -0,0 +1,24 @@
+{
+  "version": "0.2.0",
+  "configurations": [
+    {
+      "name": "C/C++ Runner: Debug Session",
+      "type": "cppdbg",
+      "request": "launch",
+      "args": [],
+      "stopAtEntry": false,
+      "externalConsole": false,
+      "cwd": "/home/kaguya/testOS/user/programs",
+      "program": "/home/kaguya/testOS/user/programs/build/Debug/outDebug",
+      "MIMode": "gdb",
+      "miDebuggerPath": "gdb",
+      "setupCommands": [
+        {
+          "description": "Enable pretty-printing for gdb",
+          "text": "-enable-pretty-printing",
+          "ignoreFailures": true
+        }
+      ]
+    }
+  ]
+}

user/.vscode/settings.json

@@ -0,0 +1,59 @@
+{
+  "C_Cpp_Runner.cCompilerPath": "gcc",
+  "C_Cpp_Runner.cppCompilerPath": "g++",
+  "C_Cpp_Runner.debuggerPath": "gdb",
+  "C_Cpp_Runner.cStandard": "gnu11",
+  "C_Cpp_Runner.cppStandard": "",
+  "C_Cpp_Runner.msvcBatchPath": "C:/Program Files/Microsoft Visual Studio/VR_NR/Community/VC/Auxiliary/Build/vcvarsall.bat",
+  "C_Cpp_Runner.useMsvc": false,
+  "C_Cpp_Runner.warnings": [
+    "-Wall",
+    "-Wextra",
+    "-Wpedantic",
+    "-Wshadow",
+    "-Wformat=2",
+    "-Wcast-align",
+    "-Wconversion",
+    "-Wsign-conversion",
+    "-Wnull-dereference"
+  ],
+  "C_Cpp_Runner.msvcWarnings": [
+    "/W4",
+    "/permissive-",
+    "/w14242",
+    "/w14287",
+    "/w14296",
+    "/w14311",
+    "/w14826",
+    "/w44062",
+    "/w44242",
+    "/w14905",
+    "/w14906",
+    "/w14263",
+    "/w44265",
+    "/w14928"
+  ],
+  "C_Cpp_Runner.enableWarnings": true,
+  "C_Cpp_Runner.warningsAsError": false,
+  "C_Cpp_Runner.compilerArgs": [],
+  "C_Cpp_Runner.linkerArgs": [],
+  "C_Cpp_Runner.includePaths": [],
+  "C_Cpp_Runner.includeSearch": [
+    "*",
+    "**/*"
+  ],
+  "C_Cpp_Runner.excludeSearch": [
+    "**/build",
+    "**/build/**",
+    "**/.*",
+    "**/.*/**",
+    "**/.vscode",
+    "**/.vscode/**"
+  ],
+  "C_Cpp_Runner.useAddressSanitizer": false,
+  "C_Cpp_Runner.useUndefinedSanitizer": false,
+  "C_Cpp_Runner.useLeakSanitizer": false,
+  "C_Cpp_Runner.showCompilationTime": false,
+  "C_Cpp_Runner.useLinkTimeOptimization": false,
+  "C_Cpp_Runner.msvcSecureNoWarnings": false
+}

user/Makefile

@@ -0,0 +1,48 @@
+CC = gcc
+LD = ld
+
+BUILD = build
+
+CFLAGS = \
+	-m64 \
+	-O2 \
+	-ffreestanding \
+	-fno-pie \
+	-fno-pic \
+	-fno-stack-protector \
+	-nostdlib \
+	-nodefaultlibs \
+	-fno-builtin
+
+LDFLAGS = \
+	-m elf_x86_64 \
+	-T linker.ld \
+	-nostdlib \
+	-z max-page-size=0x1000
+
+SRC_C = programs/init.c
+SRC_S = crt0.S
+
+OBJ = \
+	$(BUILD)/init.o \
+	$(BUILD)/crt0.o
+
+all: $(BUILD)/init.elf
+
+$(BUILD):
+	mkdir -p $(BUILD)
+
+$(BUILD)/init.o: programs/init.c | $(BUILD)
+	$(CC) $(CFLAGS) -c $< -o $@
+
+$(BUILD)/crt0.o: crt0.S | $(BUILD)
+	$(CC) $(CFLAGS) -c $< -o $@
+
+$(BUILD)/init.elf: $(OBJ)
+	$(LD) $(LDFLAGS) $^ -o $@
+
+install: $(BUILD)/init.elf
+	cp $(BUILD)/init.elf /home/kaguya/testOS/ext2_root/init.elf
+
+clean:
+	rm -rf $(BUILD)

user/crt0.S

@@ -0,0 +1,12 @@
+.global _start
+
+.section .text
+_start:
+    call main
+
+    mov $60, %rax   # exit syscall (you define this later)
+    xor %rdi, %rdi
+    syscall
+
+hang:
+    jmp hang

user/include/syscalls.h

@@ -0,0 +1,15 @@
+#pragma once
+
+static inline long syscall(long num, long a1, long a2, long a3)
+{
+    long ret;
+
+    asm volatile (
+        "syscall"
+        : "=a"(ret)
+        : "a"(num), "D"(a1), "S"(a2), "d"(a3)
+        :
+    );
+
+    return ret;
+}

user/linker.ld

@@ -0,0 +1,23 @@
+ENTRY(_start)
+
+SECTIONS
+{
+    . = 0x400000;
+
+    .text : {
+        *(.text*)
+    }
+
+    .rodata : {
+        *(.rodata*)
+    }
+
+    .data : {
+        *(.data*)
+    }
+
+    .bss : {
+        *(COMMON)
+        *(.bss*)
+    }
+}

user/programs/init.c

@@ -0,0 +1,22 @@
+#include "../include/syscalls.h"
+
+unsigned strlen(const char* str)
+{
+    unsigned len = 0;
+    while (*str)
+    {
+        ++len;
+        ++str;
+    }
+
+    return len;
+}
+
+void main()
+{
+    syscall(1, 'A', 0, 0);
+    syscall(1, 'B', 0, 0);
+    syscall(1, 'C', 0, 0);
+
+    while (1);
+}