Refactoring

.gitignore

@@ -3,3 +3,5 @@
 .vscode
 **/*.img
 **/*.iso
+compile_commands.json
+.cache

src/Makefile

@@ -1,25 +1,25 @@
 EXEC := boucane
-CC := gcc -c -fno-pie -fno-builtin -fno-stack-protector -I ./
+CC := g++ -nostdlib -nostdinc -no-pie -fno-builtin -fno-stack-protector -I ./ -I include
 LD_SCRIPT := linker.ld
 
 # Note that BOOT_OBJ do not match boot.S
 # Indeed boot.o generated by boot.S should appear
 # first in the kernel binary (thus it must be linked first, cf the $(EXEC) rule)
-BOOT_OBJ := $(addsuffix .o,$(basename $(shell find ./boot -name "*.[c|S]" ! -name "boot.S")))
-DRIVERS_OBJ := $(addsuffix .o,$(basename $(shell find ./drivers -name "*.[c|S]")))
-LIBC_OBJ := $(addsuffix .o,$(basename $(shell find ./libc -name "*.[c|S]")))
+BOOT_OBJ := $(addsuffix .cc,$(basename $(shell find ./boot -name '*.cc' -name '*.S' ! -name "boot.S")))
+DRIVERS_OBJ := $(addsuffix .o,$(basename $(shell find ./drivers -name '*.cc' -o -name '*.S')))
+LIBS_OBJ := $(addsuffix .cc,$(basename $(shell find ./libs -name '*.cc' -o -name '*.S')))
 
 all: $(EXEC)
 
-$(EXEC): boot/boot.o $(BOOT_OBJ) $(DRIVERS_OBJ) $(LIBC_OBJ) boucane.o
-	ld -n -T $(LD_SCRIPT) -nostdlib -o $@ $^ 
+$(EXEC): boot/boot.o $(BOOT_OBJ) $(DRIVERS_OBJ) $(LIBS_OBJ) boucane.o
+	$(CC) -n -T $(LD_SCRIPT) -nostdlib -o $@ $^
 
 %.o: %.S
 	as -o $@ $^
 
-%.o: %.c
-	$(CC) -o $@ $<
-	
+%.o: %.cc
+	$(CC) -c -o $@ $^
+
 clean:
 	rm -f $(EXEC)
 	find ./ -name "*.o" -delete

src/boot/boot.S

@@ -1,6 +1,5 @@
 .globl  _start
 .globl MB_INFO
-.extern boucane
 .extern _bss_start
 .extern _bss_end
 .extern boucane
@@ -49,7 +48,16 @@ MB_INFO:
 
 _start:
 mov %ebx,(MB_INFO)
-
+# Zeroing the .bss section
+mov $_bss_start, %eax
+mov $_bss_end, %ebx
+start_zeroing:
+    movb $0x0, (%eax)
+    cmp %eax, %ebx
+    je end_zeroing
+    inc %eax
+    jmp start_zeroing
+end_zeroing:
 # ----- Setup PAE Paging (identity on the first 10MB)
 mov $8192, %ecx # 8*4096/4 (8 tables of 4096 byte each divide by 4 because of movl)
 mov $0, %eax
@@ -104,7 +112,20 @@ lgdt (gdtr)
 jmp $0x08, $new_cs
 new_cs:
 
+mov $0x10, %ax
+mov %ax, %ds
+mov %ax, %es
+mov %ax, %fs
+mov %ax, %gs
+mov %ax, %ss
+
+# Pay attention here!
+# You are in long mode here
+# Thus if you want to add any instructions
+# You should use .code64 before
+
 # Run boucane
+.code64
 jmp boucane
 
 # GDT
@@ -121,8 +142,8 @@ gdt64:
     gdt64_ds:
     .long 0
     .byte 0
-    .byte 0b10000000
+    .byte 0b10010010
     .word 0
 gdtr:
     .word . - gdt64 - 1
-    .quad gdt64
+    .quad gdt64

src/boucane.c

@@ -1,9 +0,0 @@
-#include "libc/stdio.h"
-
-
-
-void boucane(){
-    clear();
-    print("Boucane is booting...");
-    while(1);
-}

src/boucane.cc

@@ -0,0 +1,11 @@
+#include "boucane.hpp"
+
+extern "C" void boucane(){
+    clear();
+    char a[]="Loic Guegan";
+    printk("Booting Boucane v%d.%d.%d",VERSION_MAJOR,VERSION_MINOR, VERSION_PATH);
+
+
+
+    while(1);
+}

src/core/types.hpp

@@ -1,9 +1,6 @@
-#ifndef TYPES_H
-#define TYPES_H
+#pragma once
 
 typedef unsigned char u8;
 typedef unsigned short u16;
 typedef unsigned int u32;
 typedef unsigned long long u64;
-
-#endif

src/drivers/framebuffer.cc

@@ -1,4 +1,4 @@
-#include "framebuffer.h"
+#include "framebuffer.hpp"
 
 #define MAX_COL 80
 #define MAX_LINE 25

src/drivers/framebuffer.hpp

@@ -1,7 +1,6 @@
-#ifndef FRAMEBUFFER_H
-#define FRAMEBUFFER_H
+#pragma once
 
-#include "core/types.h"
+#include "core/types.hpp"
 
 typedef enum VIDEO_COLORS {
   BLACK=0, BLUE=1, GREEN=2,CYAN=3, RED=4,PURPLE=5,BROWN=6,GRAY=7,
@@ -32,4 +31,3 @@ void scrollup();
  */
 void clear();
 
-#endif

src/include/boucane.hpp

@@ -0,0 +1,11 @@
+#pragma once
+
+#define VERSION_MAJOR 0
+#define VERSION_MINOR 1
+#define VERSION_PATH 0
+
+#include "core/types.hpp"
+#include "libs/math.hpp"
+#include "libs/stdio.hpp"
+#include "libs/string.hpp"
+

src/libc/math.c

@@ -1,32 +0,0 @@
-#include "math.h"
-
-int pow(int x,int n){
-    if(n<0)
-        return -1;
-    else if(n==0)
-        return 1;
-    else if(n==1)
-        return x;
-    int ret=x;
-    for(int i=0;i<(n-1);i++)
-        ret*=x;
-    return ret;
-}
-
-int max(int x,int y){
-    if(x>y)
-        return x;
-    return y;
-}
-
-int min(int x,int y){
-    if(x<y)
-        return x;
-    return y;
-}
-
-int abs(int x){
-    if(x<0)
-        return -x;
-    return x;
-}

src/libc/math.h

@@ -1,9 +0,0 @@
-#ifndef MATH_H
-#define MATH_H
-
-int pow(int x,int n);
-int max(int x,int y);
-int min(int x,int y);
-int abs(int x);
-
-#endif

src/libc/stdio.c

@@ -1,25 +0,0 @@
-#include "stdio.h"
-#include "string.h"
-
-extern VIDEO_STATE VS;
-
-void print(char *str){
-  int i=0;
-  while(str[i]!='\0'){
-    putchar(str[i]);
-    i++;
-  }
-}
-
-void printc(char* str,VIDEO_COLORS c){
-  VIDEO_COLORS backup=VS.fg;
-  VS.fg=c;
-  print(str);
-  VS.fg=backup;
-}
-
-void printi(int i){
-    char str[12];
-    itoa(i,str);
-    print(str);
-}

src/libc/stdio.h

@@ -1,21 +0,0 @@
-#ifndef STDIO_H
-#define STDIO_H
-
-#include "drivers/framebuffer.h"
-
-/**
- * Print a char* in the framebuffer
- */
-void print(char*);
-
-/**
- * Print a char in the framebuffer
- */
-void printc(char*,VIDEO_COLORS c);
-
-/**
- * Print an integer using itoa()
- */
-void printi(int i);
-
-#endif

src/libc/string.c

@@ -1,29 +0,0 @@
-#include "string.h"
-#include "math.h"
-
-void itoa(int i, char *a){
-    // Check if lower than 0
-    char neg=0;
-    if(i<0){
-        neg=1;
-        i=-i;
-        a[0]='-';
-    }
-
-    // Count number of digits
-    int len=1;
-    while(i/pow(10,len)>=1)
-    {
-        len++;
-    }
-
-    // Build string
-    int max_pow=len-1;
-    for(int j=0;j<=max_pow;j++){
-        int cur_pow=pow(10,max_pow-j);
-        char digit=i/cur_pow;
-        a[j+neg]='0'+digit;
-        i=i-digit*cur_pow; // Remove first digits (most significant)
-    }
-    a[len+neg]='\0';
-}

src/libc/string.h

@@ -1,9 +0,0 @@
-#ifndef STRING_H
-#define STRING_H
-
-/**
- * Convert int to char
- */
-void itoa(int i, char *a);
-
-#endif

src/libs/math.cc

@@ -0,0 +1,32 @@
+#include "math.hpp"
+
+int pow(int x, int n) {
+  if (n < 0)
+    return -1;
+  else if (n == 0)
+    return 1;
+  else if (n == 1)
+    return x;
+  int ret = x;
+  for (int i = 0; i < (n - 1); i++)
+    ret *= x;
+  return ret;
+}
+
+int max(int x, int y) {
+  if (x > y)
+    return x;
+  return y;
+}
+
+int min(int x, int y) {
+  if (x < y)
+    return x;
+  return y;
+}
+
+int abs(int x) {
+  if (x < 0)
+    return -x;
+  return x;
+}

src/libs/math.hpp

@@ -0,0 +1,6 @@
+#pragma once
+
+int pow(int x, int n);
+int max(int x, int y);
+int min(int x, int y);
+int abs(int x);

src/libs/stdio.cc

@@ -0,0 +1,123 @@
+#include "stdio.hpp"
+#include "drivers/framebuffer.hpp"
+#include "math.hpp"
+#include "string.hpp"
+
+extern VIDEO_STATE VS;
+void (*__putchar)(char)=putchar;
+
+void printk(char *str,...) {
+  u64 rsi,rdx,rcx,r8,r9;
+  u64* rbp;
+  asm( "mov %%rsi, %0": "=a"(rsi));
+  asm( "mov %%rdx, %0": "=a"(rdx));
+  asm( "mov %%rcx, %0": "=a"(rcx));
+  asm( "mov %%r8, %0": "=a"(r8));
+  asm( "mov %%r9, %0": "=a"(r9));
+  asm( "mov %%rbp, %0": "=a"(rbp));
+
+  // Init informations
+  int len=strlen(str);
+  int i=0; // Pointer to the current character
+  int p=1; // Pointer to the current parameter
+
+  while (i!=len) {
+    char c=str[i];
+    // Check if special char is comming
+    if(str[i]=='%'){
+      char c2=str[i+1];
+      char c3=str[i+2];
+      // First just consider the data as a void pointer
+      u64 data;
+      switch (p) {
+      case 1:
+        data=rsi;
+        break;
+      case 2:
+        data=rdx;
+        break;
+      case 3:
+        data=rcx;
+        break;
+      case 4:
+        data=r8;
+        break;
+      case 5:
+        data=r9;
+        break;
+      default:
+        data=*(rbp+2+p-6);
+      }
+      
+      if(c2=='%'){
+        __putchar('%');
+        i++;
+      }
+      else if (c2=='d') {
+        int data_int=(int)data;
+        printi(data_int);
+        i++;
+        p++;
+      }
+      else if (c2=='s') {
+        print((char*)data);
+        i++;
+        p++;
+      }
+      else if (c2=='x') {
+        print("0x");
+        printh(data);
+        i++;
+        p++;
+      }
+      else if (c2=='l' && c3=='l') {
+        printi(data); // TODO: Print 64bit number
+        i+=2;
+        p++;
+      }
+    }
+    else{
+      __putchar(c);
+    }
+    i++;
+  }
+}
+
+void print(char *s){
+  int i=0;
+  while(s[i]!='\0'){
+    __putchar(s[i]);
+    i++;
+  }
+}
+
+void printc(char *str, VIDEO_COLORS c) {
+  VIDEO_COLORS backup = (VIDEO_COLORS)VS.fg;
+  VS.fg = c;
+  print(str);
+  VS.fg = backup;
+}
+
+void printi(int i) {
+  char str[12];
+  itoa(i, str);
+  print(str);
+}
+
+void printh(int h) {
+  char str[17];
+  itoh(h, str);
+  print(str);
+}
+void printh(int h, int size) {
+  char str[17];
+  char str2[17];
+  itoh(h, str);
+  int a = 0;
+  for (int i = min(max(16 - size, 0), 15); i < 16; i++) {
+    str2[a] = str[i];
+    a++;
+  }
+  str2[a] = '\0';
+  print(str2);
+}

src/libs/stdio.hpp

@@ -0,0 +1,36 @@
+#pragma once
+
+#include "drivers/framebuffer.hpp"
+
+/// @brief Current active framebuffer driver
+extern void (*__putchar)(char);
+
+/**
+ * Print a char* in the framebuffer
+ */
+void printk(char *,...);
+
+/**
+ * Print a char*
+ */
+void print(char *s);
+
+/**
+ * Print a char in the framebuffer
+ */
+void printc(char *, VIDEO_COLORS c);
+
+/**
+ * Print an integer using itoa()
+ */
+void printi(int i);
+
+/**
+ * Print an integer as hex using itoh()
+ */
+void printh(int h);
+
+/**
+ * Print an integer as hex using itoh() truncated to size
+ */
+void printh(int h, int size);

src/libs/string.cc

@@ -0,0 +1,71 @@
+#include "string.hpp"
+#include "math.hpp"
+
+void memcpy(void* src, void* dst, int size){
+    char *c_src=(char*)src;
+    char *c_dst=(char*)dst;
+    for(int i=0;i<size;i++)
+        *c_dst=*c_src;
+}
+
+void itoa(u64 i, char *a){
+    // Check if lower than 0
+    char neg=0;
+    if(i<0){
+        neg=1;
+        i=-i;
+        a[0]='-';
+    }
+
+    // Count number of digits
+    int len=1;
+    while(i/pow(10,len)>=1)
+    {
+        len++;
+    }
+
+    // Build string
+    int max_pow=len-1;
+    for(int j=0;j<=max_pow;j++){
+        int cur_pow=pow(10,max_pow-j);
+        char digit=i/cur_pow;
+        a[j+neg]='0'+digit;
+        i=i-digit*cur_pow; // Remove first digits (most significant)
+    }
+    a[len+neg]='\0';
+}
+
+void itoh(u64 i, char *a){
+    char hex[]={'0','1','2','3','4','5','6','7','8','9',
+        'A','B','C','D','E','F'
+    };
+
+    // i should be split int two
+    // indeed shifting with more than 32 bits seems undefined 
+    u32 i_a=i&0xFFFFFFFF;
+    u32 i_b=i>>32;
+
+   for(char j=0;j<8;j++){
+        u64 t=(j*4);
+        u64 mask=0xF;
+        mask=mask <<  t;
+        u64 index=(i_a&mask) >> t;
+        a[15-j]=hex[index];
+    } 
+
+   for(char j=0;j<8;j++){
+        u64 t=(j*4);
+        u64 mask=0xF;
+        mask=mask <<  t;
+        u64 index=(i_b&mask) >> t;
+        a[15-(j+8)]=hex[index];
+    }
+    a[16]='\0';
+}
+
+int strlen(char *s){
+    int i=0;
+    while(s[i]!='\0')
+        i++;
+    return i;
+}

src/libs/string.hpp

@@ -0,0 +1,23 @@
+#pragma once
+
+#include "core/types.hpp"
+
+/**
+ * Copy data byte per byte from src to dst
+ */
+void memcpy(void *src, void *dst, int size);
+
+/**
+ * Convert int to char array
+ */
+void itoa(u64 i, char *a);
+
+/**
+ * Convert int to char array
+ */
+void itoh(u64 i, char *a);
+
+/**
+ * Length of a char*
+ */
+int strlen(char *s);

src/linker.ld

@@ -7,7 +7,8 @@ SECTIONS {
 
     .text : ALIGN(4)
     {
-        *(.multiboot)
+        *boot.o(.multiboot)
+        *boot.o(.text)
         *(.text)
     }
     .rodata : ALIGN(4)