massive overhaul to my exception system
This commit is contained in:
@ -1,10 +1,9 @@
|
||||
#include <stdatomic.h>
|
||||
#include <stdbool.h>
|
||||
#include <stdint.h>
|
||||
|
||||
#ifdef __TESTING__
|
||||
#include <kernel/_kernel.h>
|
||||
#include <stdio.h>
|
||||
#endif
|
||||
|
||||
#include <kernel/_kernel.h>
|
||||
#include <kernel/x86/idt.h>
|
||||
#include <kernel/x86/pic.h>
|
||||
#include <kernel/x86/io.h>
|
||||
@ -19,21 +18,218 @@ static bool vectors[IDT_MAX_DESCRIPTORS];
|
||||
|
||||
extern struct keyboard_state keyb_state;
|
||||
|
||||
void exception_handler(struct cpu_state __attribute__((unused)) cpu, uint32_t interrupt, struct stack_state stack)
|
||||
|
||||
#define EXTERNAL_BIT (0x1)
|
||||
|
||||
#define TBL_GDT (0x0)
|
||||
#define TBL_LDT (0x2)
|
||||
#define TBL_IDT (0x1)
|
||||
#define TBL_IDT_TWO (0x3)
|
||||
|
||||
static void examine_selector(uint32_t selector)
|
||||
{
|
||||
printf("%1 %2\n", interrupt, stack.eflags);
|
||||
if (interrupt <= 31) { // TODO: implement proper handling for each exception, also implement the proper gates & error code checking
|
||||
#ifdef __TESTING__
|
||||
kerror("EXCEPTION");
|
||||
printf("Exeption: %2\n", interrupt);
|
||||
#endif
|
||||
//__asm__ volatile ("cli; hlt"); // hangs the computer
|
||||
printf("The interrupt arised %s.\n", (selector & EXTERNAL_BIT) == EXTERNAL_BIT ? "externally" : "internally");
|
||||
|
||||
|
||||
printf("The descriptor 0x%x, is located in the ", selector, (selector & 0x0000FFFF) >> 3);
|
||||
if ((((selector >> 1) & TBL_IDT) == TBL_IDT)
|
||||
|| ((selector >> 1) & TBL_IDT_TWO) == TBL_IDT_TWO) {
|
||||
puts("IDT.");
|
||||
|
||||
} else if (((selector >> 1) & TBL_LDT) == TBL_LDT) {
|
||||
puts("LDT.");
|
||||
} else {
|
||||
puts("GDT.");
|
||||
}
|
||||
|
||||
return;
|
||||
}
|
||||
|
||||
#undef TBL_GDT
|
||||
#undef TBL_LDT
|
||||
#undef TBL_IDT
|
||||
#undef TBL_IDT_TWO
|
||||
|
||||
#define PF_P (1 << 0)
|
||||
#define PF_W (1 << 1)
|
||||
#define PF_U (1 << 2)
|
||||
#define PF_R (1 << 3)
|
||||
#define PF_I (1 << 4)
|
||||
#define PF_PK (1 << 5)
|
||||
#define PF_SS (1 << 6)
|
||||
#define PF_SGX (1 << 15)
|
||||
static void examine_page_fault(uint32_t error_code)
|
||||
{
|
||||
puts("Page fault:");
|
||||
if (error_code & PF_P) {
|
||||
puts("Page-protection violation.");
|
||||
} else {
|
||||
puts("Not present page.");
|
||||
}
|
||||
|
||||
if (interrupt == PIC_KEYB) {
|
||||
unsigned char in = inb(0x60);
|
||||
do_keypress(decode_scancode(in));
|
||||
PIC_sendEOI(1);
|
||||
if (error_code & PF_W) {
|
||||
puts("Write access.");
|
||||
} else {
|
||||
puts("Read access.");
|
||||
}
|
||||
|
||||
if (error_code & PF_U) {
|
||||
puts("In CPL 3.");
|
||||
}
|
||||
|
||||
if (error_code & PF_R) { // Only applies if PSE or PAE are set in CR4
|
||||
puts("One or more page directory entires contain reserved bits which are set to 1.");
|
||||
}
|
||||
|
||||
if (error_code & PF_I) { // Only applicable when the No-Execute bit is supported and enabled
|
||||
puts("Instruction fetch.");
|
||||
}
|
||||
|
||||
if (error_code & PF_PK) {
|
||||
puts("Protection-key violation"); //TODO PRKU (user mode access) or PRKS MSR (supervisor mode access) specifies the key rights
|
||||
}
|
||||
|
||||
if (error_code & PF_SS) {
|
||||
puts("Shadow stack access.");
|
||||
}
|
||||
|
||||
if (error_code & PF_SGX) { // Unrelated to ordinary paging
|
||||
puts("SGX vioilation");
|
||||
}
|
||||
|
||||
// TODO, also sets CR2 reg to the virtual address which caused the page fault
|
||||
}
|
||||
#undef PF_P
|
||||
#undef PF_W
|
||||
#undef PF_U
|
||||
#undef PF_R
|
||||
#undef PF_I
|
||||
#undef PF_PK
|
||||
#undef PF_SS
|
||||
#undef PF_SGX
|
||||
|
||||
#define EXCEPTION_LOCATION() printf("Exception occurred at 0x%2\n", stack.eip)
|
||||
|
||||
void exception_handler(struct cpu_state __attribute__((unused)) cpu, uint32_t interrupt, struct stack_state stack)
|
||||
{
|
||||
uint32_t inbyte;
|
||||
switch (interrupt) {
|
||||
/** EXCEPTIONS BEGIN **/
|
||||
case EXCEPT_DIV_ERR:
|
||||
kerror("EXCEPTION: DIV BY ZERO");
|
||||
EXCEPTION_LOCATION();
|
||||
break;
|
||||
case EXCEPT_DEBUG:
|
||||
kinfo("EXCEPTION: DEBUG"); // TODO: this one has more specific requirements
|
||||
break;
|
||||
case EXCEPT_NMI:
|
||||
kinfo("EXCEPTION: NON-MASKABLE INTERRUPT"); // TODO
|
||||
break;
|
||||
case EXCEPT_BREAKPOINT:
|
||||
kinfo("EXCEPTION: BREAKPOINT");
|
||||
// TODO
|
||||
break;
|
||||
case EXCEPT_OVERFLOW:
|
||||
kerror("EXCEPTION: OVERFLOW");
|
||||
break;
|
||||
case EXCEPT_BOUND_RANGE_EXCEEDED:
|
||||
kerror("EXCEPTION: BOUND RANGE EXCEEDED");
|
||||
EXCEPTION_LOCATION();
|
||||
break;
|
||||
case EXCEPT_INVALID_OPCODE:
|
||||
kerror("EXCEPTION: INVALID OPCODE");
|
||||
EXCEPTION_LOCATION();
|
||||
break;
|
||||
case EXCEPT_DEVICE_NOT_AVAILABLE:
|
||||
kerror("EXCEPTION: DEVICE NOT AVAILABLE");
|
||||
printf("Instructions expecting an FPU were used, but no FPU was found. Is it disabled in CR0? Do you have an FPU?\n");
|
||||
EXCEPTION_LOCATION();
|
||||
break;
|
||||
case EXCEPT_DOUBLE_FAULT:
|
||||
kerror("EXCEPTION: DOUBLE FAULT");
|
||||
__asm__ volatile ("cli; hlt"); // boned
|
||||
break;
|
||||
case EXCEPT_INVALID_TSS:
|
||||
kerror("EXCEPTION: INVALID TSS");
|
||||
examine_selector(stack.error_code);
|
||||
// TODO: when i implement the TSS, the EIP will be one of two things
|
||||
// if this occurs before loading segmenet selectors from the TSS, EIP will be the instruction that caused the instruction
|
||||
// otherwise its the first instruction in the new task
|
||||
break;
|
||||
case EXCEPT_SEG_NOT_PRESENT:
|
||||
kerror("EXCEPTION: SEGMENT NOT PRESENT");
|
||||
EXCEPTION_LOCATION();
|
||||
examine_selector(stack.error_code);
|
||||
break;
|
||||
case EXCEPT_STACK_SEG_FAULT:
|
||||
kerror("EXCEPTION: STACK-SEGMENT FAULT");
|
||||
if (stack.error_code == 0) {
|
||||
EXCEPTION_LOCATION();
|
||||
} else {
|
||||
printf("Tried loading non-present stack segment during hardware task switch.\n");
|
||||
examine_selector(stack.error_code);
|
||||
}
|
||||
break;
|
||||
case EXCEPT_GENERAL_PROTECTION:
|
||||
kerror("EXCEPTION: GENERAL PROTECTION FAULT");
|
||||
EXCEPTION_LOCATION();
|
||||
if (stack.error_code != 0)
|
||||
examine_selector(stack.error_code);
|
||||
break;
|
||||
case EXCEPT_PAGE_FAULT:
|
||||
kerror("EXCEPTION: PAGE FAULT");
|
||||
EXCEPTION_LOCATION();
|
||||
examine_page_fault(stack.error_code);
|
||||
break;
|
||||
case EXCEPT_FLOATING_POINT_ERR_FPU:
|
||||
kerror("EXCEPTION: FLOATING POINT ERROR FPU");
|
||||
// TODO: this requires a custom handler, it needs another register
|
||||
break;
|
||||
case EXCEPT_ALIGNMENT_CHECK:
|
||||
kerror("EXCEPTION: ALIGNMENT CHECK");
|
||||
|
||||
// TODO: only in CPL3
|
||||
break;
|
||||
case EXCEPT_MACHINE_CHECK:
|
||||
kerror("EXCEPTION: MACHINE CHECK");
|
||||
// TODO disabled by default
|
||||
break;
|
||||
case EXCEPT_FLOATING_POINT_ERR_SIMD:
|
||||
kerror("EXCEPTION: FLOATING POINT ERROR SIMD");
|
||||
// TODO disabled by default
|
||||
break;
|
||||
case EXCEPT_VIRT:
|
||||
kerror("EXCEPTION: VIRTUALIZATION");
|
||||
break;
|
||||
case EXCEPT_CTRL_PROT:
|
||||
kerror("EXCEPTION: CONTROL PROTECTION");
|
||||
printf("Error code: 0x%2\n", stack.error_code);
|
||||
break;
|
||||
case EXCEPT_HYPERVISOR_INJECTION:
|
||||
kerror("EXCEPTION: HYPERVISOR INJECTION");
|
||||
break;
|
||||
case EXCEPT_VMM_COMMUNICATION:
|
||||
kerror("EXCEPTION: VMM COMMUNICATION");
|
||||
printf("Error code: 0x%2\n", stack.error_code);
|
||||
break;
|
||||
case EXCEPT_SECURITY_EXCEPTION:
|
||||
kerror("EXCEPTION: SECURITY");
|
||||
printf("Error code: 0x%2\n", stack.error_code);
|
||||
break;
|
||||
/** EXCEPTIONS END **/
|
||||
|
||||
/** PIC BEGIN **/
|
||||
case PIC_KEYB:
|
||||
inbyte = inb(0x60);
|
||||
do_keypress(decode_scancode(inbyte));
|
||||
PIC_sendEOI(1);
|
||||
break;
|
||||
|
||||
/** PIC END **/
|
||||
default:
|
||||
kerror("EXCEPTION: UNHANDLED EXCEPTION OR INTERRUPT");
|
||||
printf("Error code: 0x%2\n", stack.error_code);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
@ -68,7 +264,7 @@ void idt_init(void)
|
||||
PIC_remap(0x20, 0x28);
|
||||
pic_disable(); // mask everything
|
||||
IRQ_clear_mask(1);
|
||||
|
||||
|
||||
__asm__ volatile("sti"); // set the interrupt flag
|
||||
#ifdef __TESTING__
|
||||
kinfo("Initialized the IDT");
|
||||
|
||||
Reference in New Issue
Block a user