Slighly changed everything :)

- Makefile changes
- Linker script updates
- Made it comply with C17
- Removed entry.asm (finally)

Makefile

@@ -3,7 +3,8 @@ CC = i386-elf-gcc
 LD = i386-elf-ld
 AS = nasm
 
-CFLAGS = -ffreestanding -fno-builtin -fno-stack-protector -nostdinc -mgeneral-regs-only -m32 -march=i386 -Wall -Iinclude/c
+CFLAGS = -std=c17 -ffreestanding -fno-builtin -fno-stack-protector -fno-pie \
+		 -Os -nostdinc -mgeneral-regs-only -m32 -march=i386 -Wall -Iinclude/c
 
 SRC = ./src
 BUILD = ./build
@@ -43,18 +44,16 @@ bootloader: $(SRC)/stage1.asm $(SRC)/stage2.asm
 	@cat $(BUILD)/stage1.bin $(BUILD)/stage2.bin > $(BUILD)/boot.bin
 
 # Kernel: This target is responsible for creating kernel.bin
-kernel: $(SRC)/kernel.c $(SRC)/entry.asm
-	@echo "Assembling $(SRC)/entry.asm..."
-	@$(AS) -felf32 -o $(BUILD)/entry.o $(SRC)/entry.asm
+kernel: $(SRC)/kernel.c
 	@echo "Compiling $(SRC)/kernel.c..."
 	@$(CC) $(CFLAGS) -Iinclude -o $(BUILD)/kernel.o -c $(SRC)/kernel.c
-	@$(LD) -T$(SRC)/kernel.ld --oformat binary -o $(BUILD)/kernel.bin $(BUILD)/*.o
+	@$(LD) -T$(SRC)/kernel.ld -z notext --oformat binary -o $(BUILD)/kernel.bin $(BUILD)/kernel.o
 	@rm $(BUILD)/*.o
 
 $(C_FILES):
 	@echo "Compiling $(SRC)/$@.c..."
 	@$(CC) $(CFLAGS) -o $(BUILD)/$@.o -c $(SRC)/$@.c 
-	@$(LD) -T$(SRC)/$@.ld --oformat binary -o $(BUILD)/$@.bin $(BUILD)/$@.o
+	@$(LD) -T$(SRC)/$@.ld -z notext --oformat binary -o $(BUILD)/$@.bin $(BUILD)/$@.o
 	@rm $(BUILD)/$@.o
 
 $(FONTS):

include/disk/disk.h

@@ -9,8 +9,6 @@
 #define WRITE_COMMAND 0x30
 #define CACHE_FLUSH 0xE7
 
-extern uint8_t driveNum;
-
 void diskRead(uint32_t lbaAddress, uint8_t sectorCount, char* dst) {
     outb(PIO_PORT + 6, ((lbaAddress >> 24) & 0x0f) | 0xe0); // 6 - Use LBA; 4 - Drive number; 3-0 - Highest lba address nibble
     outb(PIO_PORT + 2, sectorCount); // Sector count register

include/ports/io.h

@@ -6,27 +6,27 @@
 // Port functions
 uint8_t inb(uint16_t port) {
     uint8_t result;
-    asm volatile("inb %1, %0" : "=a"(result) : "Nd"(port));
+    __asm__ volatile("inb %1, %0" : "=a"(result) : "Nd"(port));
     return result;
 }
 
 void outb(uint16_t port, uint8_t data) {
-    asm volatile("outb %0, %1" :: "a"(data), "Nd"(port));
+    __asm__ volatile("outb %0, %1" :: "a"(data), "Nd"(port));
 }
 
 uint16_t inw(uint16_t port) {
     uint16_t result;
-    asm volatile("inw %1, %0" : "=a"(result) : "Nd"(port));
+    __asm__ volatile("inw %1, %0" : "=a"(result) : "Nd"(port));
     return result;
 }
 
 void outw(uint16_t port, uint16_t data) {
-    asm volatile("outw %0, %1" :: "a"(data), "Nd"(port));
+    __asm__ volatile("outw %0, %1" :: "a"(data), "Nd"(port));
 }
 
 void ioWait() {
     // Waits ~1 I/O Cycle (Linux uses this so it should be good)
-    asm volatile("outb %%al, $0x80" : : "a"(0));
+    __asm__ volatile("outb %%al, $0x80" : : "a"(0));
 }
 
 #endif

src/calc.c

@@ -1,8 +1,9 @@
 #include <stdio.h>
+#include <stdlib.h>
 
+__attribute__ ((section("entry")))
 void main() {
-    char msg[8] = { 'H','e','l','l','o','!','\n',0 };
-    print(msg);
+    print("Hello, World!\n");
 
     return;
 }

src/calc.ld

@@ -1,6 +1,6 @@
-ENTRY("main");
 SECTIONS {
     .text : {
+        *(entry);
         *(.text*);
     }
     .data : {

src/entry.asm

@@ -1,22 +0,0 @@
-[bits 32]
-[global _start]
-[global driveNum]
-
-[extern main]
-
-;; Calls the main function in 'main.c'
-_start:
-    pop ax
-    mov [driveNum], al
-
-    call main
-    
-    ; Exit QEMU
-    mov ax, 0x2000
-    mov dx, 0x0604
-    out dx, ax
-
-    jmp $       ;; If we used cli, hlt we wouldn't have interrupts :/
-
-driveNum: db 0
-

src/kernel.c

@@ -17,6 +17,7 @@
 #include <memory/virtual.h>
 #include <memory/addresses.h>
 #include <memory/malloc.h>
+#include <stdlib.h>
 
 #define PROMPT "#> "
 
@@ -26,6 +27,7 @@ char* filetable = (char*)FILETABLE_LOC; // Pretty sure we don't have to care abo
 void printFiletable(char* ft);
 void printPhysicalMemmap();
 
+__attribute__ ((section("entry")))
 void main() {
     // Interrupt setup
     setupIdt();
@@ -260,6 +262,10 @@ void main() {
             } else {
                 print("[ FAIL ]\n");
             }
+            print("Malloc Test ........ ");
+            void* buffer = malloc(100);
+            free(buffer);
+            print("[ DONE ]\n");
             
             print("\nTests Finished!\n");
         } else {

src/kernel.ld

@@ -1,5 +1,6 @@
 SECTIONS {
     .text 0x50000 : {
+        *(entry);
         *(.text*);
     }
     .data : {

src/stage2.asm

@@ -324,9 +324,6 @@ protected_start:
     rep movsd
 
     ; Perform The far jump
-    mov al, [driveNum]
-    push ax
-    
     jmp CODE_SEG:KERNEL_LOC
 
 ;; Data