Add: ISR now handling common exceptions

<

@@ -0,0 +1,50 @@
+#include "stdio.h"
+#include "serial.h"
+#include "gdt.h"
+#include "idt.h"
+#include "system.h"
+
+int kmain(int retvalue)
+{
+  
+  gdt_install();
+  idt_install();
+  isr_install();
+
+  // serial testing
+
+  init_serial();
+  
+  log("serial connection established", 3);
+  log("initialized GDT entries", 2);
+  log("kernel started", 2);
+  log("initialized IDT", 2);
+  log("initialized ISRs", 3);
+
+  clear();
+
+  // printf testing
+
+  // TODO: Framebuffer upgrade: color output
+
+  int age = 34;
+  int problems = 124;
+  char* name = "xamidev"; 
+  
+  printf("Hello %s, you are %d years old and have %d problems. wow %%\n", name, age, problems);
+  
+  long suchwow = 2934342;
+  char character = 65;
+  printf("such number %u\nsuch character %c", suchwow, character);
+  
+  printf("wow negative %d\n", -3742);
+  printf("such hex %x %X\n", 0xcafe, 0xdeadbeef);
+  
+  printf("such pointer %p\n", (void*)0xcafe1234);
+ 
+  // Div by zero exception
+  
+  printf("Lalala, what a beautiful day! %d", 4/0);
+
+  return retvalue;
+}

isr.c

@@ -0,0 +1,117 @@
+#include "system.h"
+#include "stdio.h"
+#include "idt.h"
+
+extern void isr0();
+extern void isr1();
+extern void isr2();
+extern void isr3();
+extern void isr4();
+extern void isr5();
+extern void isr6();
+extern void isr7();
+extern void isr8();
+extern void isr9();
+extern void isr10();
+extern void isr11();
+extern void isr12();
+extern void isr13();
+extern void isr14();
+extern void isr15();
+extern void isr16();
+extern void isr17();
+extern void isr18();
+extern void isr19();
+extern void isr20();
+extern void isr21();
+extern void isr22();
+extern void isr23();
+extern void isr24();
+extern void isr25();
+extern void isr26();
+extern void isr27();
+extern void isr28();
+extern void isr29();
+extern void isr30();
+extern void isr31();
+
+void isr_install()
+{
+
+	idt_set_gate(0, (unsigned)isr0, 0x08, 0x8E);
+	idt_set_gate(1, (unsigned)isr1, 0x08, 0x8E);
+	idt_set_gate(2, (unsigned)isr2, 0x08, 0x8E);
+	idt_set_gate(3, (unsigned)isr3, 0x08, 0x8E);
+	idt_set_gate(4, (unsigned)isr4, 0x08, 0x8E);
+	idt_set_gate(5, (unsigned)isr5, 0x08, 0x8E);
+	idt_set_gate(6, (unsigned)isr6, 0x08, 0x8E);
+	idt_set_gate(7, (unsigned)isr7, 0x08, 0x8E);
+	idt_set_gate(8, (unsigned)isr8, 0x08, 0x8E);
+	idt_set_gate(9, (unsigned)isr9, 0x08, 0x8E);
+	idt_set_gate(10, (unsigned)isr10, 0x08, 0x8E);
+	idt_set_gate(11, (unsigned)isr11, 0x08, 0x8E);
+	idt_set_gate(12, (unsigned)isr12, 0x08, 0x8E);
+	idt_set_gate(13, (unsigned)isr13, 0x08, 0x8E);
+	idt_set_gate(14, (unsigned)isr14, 0x08, 0x8E);
+	idt_set_gate(15, (unsigned)isr15, 0x08, 0x8E);
+	idt_set_gate(16, (unsigned)isr16, 0x08, 0x8E);
+	idt_set_gate(17, (unsigned)isr17, 0x08, 0x8E);
+	idt_set_gate(18, (unsigned)isr18, 0x08, 0x8E);
+	idt_set_gate(19, (unsigned)isr19, 0x08, 0x8E);
+	idt_set_gate(20, (unsigned)isr20, 0x08, 0x8E);
+	idt_set_gate(21, (unsigned)isr21, 0x08, 0x8E);
+	idt_set_gate(22, (unsigned)isr22, 0x08, 0x8E);
+	idt_set_gate(23, (unsigned)isr23, 0x08, 0x8E);
+	idt_set_gate(24, (unsigned)isr24, 0x08, 0x8E);
+	idt_set_gate(25, (unsigned)isr25, 0x08, 0x8E);
+	idt_set_gate(26, (unsigned)isr26, 0x08, 0x8E);
+	idt_set_gate(27, (unsigned)isr27, 0x08, 0x8E);
+	idt_set_gate(28, (unsigned)isr28, 0x08, 0x8E);
+	idt_set_gate(29, (unsigned)isr29, 0x08, 0x8E);
+	idt_set_gate(30, (unsigned)isr30, 0x08, 0x8E);
+	idt_set_gate(31, (unsigned)isr31, 0x08, 0x8E);
+}
+
+char *exception_messages[] =
+{
+	"Division by Zero",
+	"Debug",
+	"Non Maskable Interrupt",
+	"Breakpoint",
+	"Into Detected Overflow",
+	"Out of Bounds",
+	"Invalid Opcode",
+	"No Coprocessor",
+	"Double Fault",
+	"Coprocessor Segment Overrun",
+	"Bad TSS",
+	"Segment Not Present",
+	"Stack Fault",
+	"General Protection Fault",
+	"Page Fault",
+	"Unknown Interrupt",
+	"Coprocessor Fault",
+	"Alignment Check",
+	"Machine Check",
+	"Reserved",
+	"Reserved",
+	"Reserved",
+	"Reserved",
+	"Reserved",
+	"Reserved",
+	"Reserved",
+	"Reserved",
+	"Reserved",
+	"Reserved",
+	"Reserved",
+	"Reserved"
+};
+
+void fault_handler(struct regs *r)
+{
+	if (r->int_no < 32)
+	{
+		printf("%s Exception. Halting!\n", exception_messages[r->int_no]);
+		for (;;);
+	}
+}

kmain.c

@@ -2,12 +2,14 @@
 #include "serial.h"
 #include "gdt.h"
 #include "idt.h"
+#include "system.h"
 
 int kmain(int retvalue)
 {
   
   gdt_install();
   idt_install();
+  isr_install();
 
   // serial testing
 
@@ -16,11 +18,15 @@ int kmain(int retvalue)
   log("serial connection established", 3);
   log("initialized GDT entries", 2);
   log("kernel started", 2);
+  log("initialized IDT", 2);
+  log("initialized ISRs", 3);
 
   clear();
 
   // printf testing
 
+  // TODO: Framebuffer upgrade: color output
+
   int age = 34;
   int problems = 124;
   char* name = "xamidev"; 
@@ -36,5 +42,9 @@ int kmain(int retvalue)
   
   printf("such pointer %p\n", (void*)0xcafe1234);
  
+  // Div by zero exception
+  
+  printf("Lalala, what a beautiful day! %d", 4/0);
+
   return retvalue;
 }

link.ld

@@ -5,6 +5,10 @@ SECTIONS {
 
   . = 0x00100000;
 
+  .__mbHeader : {
+	  *(.__mbHeader)
+  }
+
   /* Align relevant sections at 4KB  */
 
   .text ALIGN (0x1000) :

loader.s

@@ -1,12 +1,15 @@
 global loader
 
+section .__mbHeader
+
+align 0x4
+section .text:
+
 MAGIC_NUMBER      equ 0x1BADB002   ; multiboot magic 
 FLAGS             equ 0x0 
 CHECKSUM          equ -MAGIC_NUMBER
 KERNEL_STACK_SIZE equ 4096
 
-section .text:
-align 4
   dd MAGIC_NUMBER
   dd FLAGS
   dd CHECKSUM
@@ -45,6 +48,252 @@ idt_load:
 	lidt [idtp]
 	ret
 
+global isr0
+global isr1
+global isr2
+global isr3
+global isr4
+global isr5
+global isr6
+global isr7
+global isr8
+global isr9
+global isr10
+global isr11
+global isr12
+global isr13
+global isr14
+global isr15
+global isr16
+global isr17
+global isr18
+global isr19
+global isr20
+global isr21
+global isr22
+global isr23
+global isr24
+global isr25
+global isr26
+global isr27
+global isr28
+global isr29
+global isr30
+global isr31
+
+; Interrupt service routine exceptions
+isr0:
+	cli
+	push byte 0
+	push byte 0
+	jmp isr_common_stub
+
+isr1:
+	cli
+	push byte 0
+	push byte 1
+	jmp isr_common_stub
+
+isr2:
+	cli
+	push byte 0
+	push byte 2
+	jmp isr_common_stub
+
+isr3:
+	cli
+	push byte 0
+	push byte 3
+	jmp isr_common_stub
+
+isr4:
+	cli
+	push byte 0
+	push byte 4
+	jmp isr_common_stub
+
+isr5:
+	cli
+	push byte 0
+	push byte 5
+	jmp isr_common_stub
+
+isr6:
+	cli
+	push byte 0
+	push byte 6
+	jmp isr_common_stub
+
+isr7:
+	cli
+	push byte 0
+	push byte 7
+	jmp isr_common_stub
+
+isr8:
+	cli
+	push byte 8
+	jmp isr_common_stub
+
+isr9:
+	cli
+	push byte 0
+	push byte 9
+	jmp isr_common_stub
+
+isr10:
+	cli
+	push byte 10
+	jmp isr_common_stub
+
+isr11:
+	cli
+	push byte 11
+	jmp isr_common_stub
+
+isr12:
+	cli
+	push byte 12
+	jmp isr_common_stub
+
+isr13:
+	cli
+	push byte 13
+	jmp isr_common_stub
+
+isr14:
+	cli
+	push byte 14
+	jmp isr_common_stub
+
+isr15:
+	cli
+	push byte 0
+	push byte 15
+	jmp isr_common_stub
+
+isr16:
+	cli
+	push byte 0
+	push byte 16
+	jmp isr_common_stub
+
+isr17:
+	cli
+	push byte 0
+	push byte 17
+	jmp isr_common_stub
+
+isr18:
+	cli
+	push byte 0
+	push byte 18
+	jmp isr_common_stub
+
+isr19:
+	cli
+	push byte 0
+	push byte 19
+	jmp isr_common_stub
+
+isr20:
+	cli
+	push byte 0
+	push byte 20
+	jmp isr_common_stub
+
+isr21:
+	cli
+	push byte 0
+	push byte 21
+	jmp isr_common_stub
+
+isr22:
+	cli
+	push byte 0
+	push byte 22
+	jmp isr_common_stub
+
+isr23:
+	cli
+	push byte 0
+	push byte 23
+	jmp isr_common_stub
+
+isr24:
+	cli
+	push byte 0
+	push byte 24
+	jmp isr_common_stub
+
+isr25:
+	cli
+	push byte 0
+	push byte 25
+	jmp isr_common_stub
+
+isr26:
+	cli
+	push byte 0
+	push byte 26
+	jmp isr_common_stub
+
+isr27:
+	cli
+	push byte 0
+	push byte 27
+	jmp isr_common_stub
+
+isr28:
+	cli
+	push byte 0
+	push byte 28
+	jmp isr_common_stub
+
+isr29:
+	cli
+	push byte 0
+	push byte 29
+	jmp isr_common_stub
+
+isr30:
+	cli
+	push byte 0
+	push byte 30
+	jmp isr_common_stub
+
+isr31:
+	cli
+	push byte 0
+	push byte 31
+	jmp isr_common_stub
+
+extern fault_handler
+
+isr_common_stub:
+	pusha
+	push ds
+	push es
+	push fs
+	push gs
+	mov ax, 0x10
+	mov ds, ax
+	mov es, ax
+	mov fs, ax
+	mov gs, ax
+	mov eax, esp
+	push eax
+	mov eax, fault_handler
+	call eax
+	pop eax
+	pop gs
+	pop fs
+	pop es
+	pop ds
+	popa
+	add esp, 8
+	iret
+
 section .bss
 align 4 
 kernel_stack:

makefile

@@ -1,4 +1,4 @@
-OBJECTS = loader.o kmain.o stdio.o io.o string.o serial.o gdt.o idt.o system.o 
+OBJECTS = loader.o kmain.o stdio.o io.o string.o serial.o gdt.o idt.o system.o isr.o 
 CC = gcc
 CFLAGS = -m32 -nostdlib -nostdinc -fno-builtin -fno-stack-protector -nostartfiles -nodefaultlibs -Wall -Wextra -c
 LDFLAGS = -T link.ld -melf_i386

system.h

@@ -5,4 +5,14 @@ typedef int size_t;
 
 void *memset(void *dest, char val, size_t count);
 
+struct regs
+{
+	unsigned int gs, fs, es, ds;
+	unsigned int edi, esi, ebp, esp, ebx, edx, ecx, eax;
+	unsigned int int_no, err_code;
+	unsigned int eip, cs, eflags, useresp, ss;
+};
+
+void isr_install();
+
 #endif