325 lines
9.5 KiB
C
325 lines
9.5 KiB
C
|
|
/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
|
|
protect.c
|
|
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
|
|
Forrest Yu, 2005
|
|
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
|
|
|
|
#include "type.h"
|
|
#include "const.h"
|
|
#include "protect.h"
|
|
#include "proc.h"
|
|
#include "global.h"
|
|
#include "proto.h"
|
|
#include "string.h"
|
|
#include "stdio.h"
|
|
|
|
/* 本文件内函数声明 */
|
|
static void init_idt_desc(unsigned char vector, u8 desc_type, int_handler handler, unsigned char privilege);
|
|
static void init_descriptor(DESCRIPTOR *p_desc, u32 base, u32 limit, u16 attribute);
|
|
|
|
/* 中断处理函数 */
|
|
void divide_error();
|
|
void single_step_exception();
|
|
void nmi();
|
|
void breakpoint_exception();
|
|
void overflow();
|
|
void bounds_check();
|
|
void inval_opcode();
|
|
void copr_not_available();
|
|
void double_fault();
|
|
void copr_seg_overrun();
|
|
void inval_tss();
|
|
void segment_not_present();
|
|
void stack_exception();
|
|
void general_protection();
|
|
void page_fault();
|
|
void copr_error();
|
|
void hwint00();
|
|
void hwint01();
|
|
void hwint02();
|
|
void hwint03();
|
|
void hwint04();
|
|
void hwint05();
|
|
void hwint06();
|
|
void hwint07();
|
|
void hwint08();
|
|
void hwint09();
|
|
void hwint10();
|
|
void hwint11();
|
|
void hwint12();
|
|
void hwint13();
|
|
void hwint14();
|
|
void hwint15();
|
|
|
|
/*======================================================================*
|
|
init_prot
|
|
*----------------------------------------------------------------------*
|
|
初始化 IDT
|
|
*======================================================================*/
|
|
void init_prot()
|
|
{
|
|
init_8259A();
|
|
|
|
// 全部初始化成中断门(没有陷阱门)
|
|
init_idt_desc(INT_VECTOR_DIVIDE, DA_386IGate,
|
|
divide_error, PRIVILEGE_KRNL);
|
|
|
|
init_idt_desc(INT_VECTOR_DEBUG, DA_386IGate,
|
|
single_step_exception, PRIVILEGE_KRNL);
|
|
|
|
init_idt_desc(INT_VECTOR_NMI, DA_386IGate,
|
|
nmi, PRIVILEGE_KRNL);
|
|
|
|
init_idt_desc(INT_VECTOR_BREAKPOINT, DA_386IGate,
|
|
breakpoint_exception, PRIVILEGE_USER);
|
|
|
|
init_idt_desc(INT_VECTOR_OVERFLOW, DA_386IGate,
|
|
overflow, PRIVILEGE_USER);
|
|
|
|
init_idt_desc(INT_VECTOR_BOUNDS, DA_386IGate,
|
|
bounds_check, PRIVILEGE_KRNL);
|
|
|
|
init_idt_desc(INT_VECTOR_INVAL_OP, DA_386IGate,
|
|
inval_opcode, PRIVILEGE_KRNL);
|
|
|
|
init_idt_desc(INT_VECTOR_COPROC_NOT, DA_386IGate,
|
|
copr_not_available, PRIVILEGE_KRNL);
|
|
|
|
init_idt_desc(INT_VECTOR_DOUBLE_FAULT, DA_386IGate,
|
|
double_fault, PRIVILEGE_KRNL);
|
|
|
|
init_idt_desc(INT_VECTOR_COPROC_SEG, DA_386IGate,
|
|
copr_seg_overrun, PRIVILEGE_KRNL);
|
|
|
|
init_idt_desc(INT_VECTOR_INVAL_TSS, DA_386IGate,
|
|
inval_tss, PRIVILEGE_KRNL);
|
|
|
|
init_idt_desc(INT_VECTOR_SEG_NOT, DA_386IGate,
|
|
segment_not_present, PRIVILEGE_KRNL);
|
|
|
|
init_idt_desc(INT_VECTOR_STACK_FAULT, DA_386IGate,
|
|
stack_exception, PRIVILEGE_KRNL);
|
|
|
|
init_idt_desc(INT_VECTOR_PROTECTION, DA_386IGate,
|
|
general_protection, PRIVILEGE_KRNL);
|
|
|
|
init_idt_desc(INT_VECTOR_PAGE_FAULT, DA_386IGate,
|
|
page_fault, PRIVILEGE_KRNL);
|
|
|
|
init_idt_desc(INT_VECTOR_COPROC_ERR, DA_386IGate,
|
|
copr_error, PRIVILEGE_KRNL);
|
|
|
|
init_idt_desc(INT_VECTOR_IRQ0 + 0, DA_386IGate,
|
|
hwint00, PRIVILEGE_KRNL);
|
|
|
|
init_idt_desc(INT_VECTOR_IRQ0 + 1, DA_386IGate,
|
|
hwint01, PRIVILEGE_KRNL);
|
|
|
|
init_idt_desc(INT_VECTOR_IRQ0 + 2, DA_386IGate,
|
|
hwint02, PRIVILEGE_KRNL);
|
|
|
|
init_idt_desc(INT_VECTOR_IRQ0 + 3, DA_386IGate,
|
|
hwint03, PRIVILEGE_KRNL);
|
|
|
|
init_idt_desc(INT_VECTOR_IRQ0 + 4, DA_386IGate,
|
|
hwint04, PRIVILEGE_KRNL);
|
|
|
|
init_idt_desc(INT_VECTOR_IRQ0 + 5, DA_386IGate,
|
|
hwint05, PRIVILEGE_KRNL);
|
|
|
|
init_idt_desc(INT_VECTOR_IRQ0 + 6, DA_386IGate,
|
|
hwint06, PRIVILEGE_KRNL);
|
|
|
|
init_idt_desc(INT_VECTOR_IRQ0 + 7, DA_386IGate,
|
|
hwint07, PRIVILEGE_KRNL);
|
|
|
|
init_idt_desc(INT_VECTOR_IRQ8 + 0, DA_386IGate,
|
|
hwint08, PRIVILEGE_KRNL);
|
|
|
|
init_idt_desc(INT_VECTOR_IRQ8 + 1, DA_386IGate,
|
|
hwint09, PRIVILEGE_KRNL);
|
|
|
|
init_idt_desc(INT_VECTOR_IRQ8 + 2, DA_386IGate,
|
|
hwint10, PRIVILEGE_KRNL);
|
|
|
|
init_idt_desc(INT_VECTOR_IRQ8 + 3, DA_386IGate,
|
|
hwint11, PRIVILEGE_KRNL);
|
|
|
|
init_idt_desc(INT_VECTOR_IRQ8 + 4, DA_386IGate,
|
|
hwint12, PRIVILEGE_KRNL);
|
|
|
|
init_idt_desc(INT_VECTOR_IRQ8 + 5, DA_386IGate,
|
|
hwint13, PRIVILEGE_KRNL);
|
|
|
|
init_idt_desc(INT_VECTOR_IRQ8 + 6, DA_386IGate,
|
|
hwint14, PRIVILEGE_KRNL);
|
|
|
|
init_idt_desc(INT_VECTOR_IRQ8 + 7, DA_386IGate,
|
|
hwint15, PRIVILEGE_KRNL);
|
|
|
|
init_idt_desc(INT_VECTOR_SYS_CALL, DA_386IGate,
|
|
sys_call, PRIVILEGE_USER);
|
|
|
|
/*修改显存描述符*/ // add by visual 2016.5.12
|
|
init_descriptor(&gdt[INDEX_VIDEO],
|
|
K_PHY2LIN(0x0B8000),
|
|
0x0ffff,
|
|
DA_DRW | DA_DPL3);
|
|
|
|
/* 填充 GDT 中 TSS 这个描述符 */
|
|
memset(&tss, 0, sizeof(tss));
|
|
tss.ss0 = SELECTOR_KERNEL_DS;
|
|
init_descriptor(&gdt[INDEX_TSS],
|
|
vir2phys(seg2phys(SELECTOR_KERNEL_DS), &tss),
|
|
sizeof(tss) - 1,
|
|
DA_386TSS);
|
|
tss.iobase = sizeof(tss); /* 没有I/O许可位图 */
|
|
|
|
// 填充 GDT 中进程的 LDT 的描述符
|
|
int i;
|
|
PROCESS *p_proc = proc_table;
|
|
u16 selector_ldt = INDEX_LDT_FIRST << 3;
|
|
for (i = 0; i < NR_PCBS; i++)
|
|
{ // edit by visual 2016.4.5
|
|
init_descriptor(&gdt[selector_ldt >> 3],
|
|
vir2phys(seg2phys(SELECTOR_KERNEL_DS), proc_table[i].task.ldts),
|
|
LDT_SIZE * sizeof(DESCRIPTOR) - 1,
|
|
DA_LDT);
|
|
p_proc++;
|
|
selector_ldt += 1 << 3;
|
|
}
|
|
}
|
|
|
|
/*======================================================================*
|
|
init_idt_desc
|
|
*----------------------------------------------------------------------*
|
|
初始化 386 中断门
|
|
*======================================================================*/
|
|
void init_idt_desc(unsigned char vector, u8 desc_type, int_handler handler, unsigned char privilege)
|
|
{
|
|
GATE *p_gate = &idt[vector];
|
|
u32 base = (u32)handler;
|
|
p_gate->offset_low = base & 0xFFFF;
|
|
p_gate->selector = SELECTOR_KERNEL_CS;
|
|
p_gate->dcount = 0;
|
|
p_gate->attr = desc_type | (privilege << 5);
|
|
p_gate->offset_high = (base >> 16) & 0xFFFF;
|
|
}
|
|
|
|
/*======================================================================*
|
|
seg2phys
|
|
*----------------------------------------------------------------------*
|
|
由段名求绝对地址
|
|
*======================================================================*/
|
|
u32 seg2phys(u16 seg)
|
|
{
|
|
DESCRIPTOR *p_dest = &gdt[seg >> 3];
|
|
|
|
return (p_dest->base_high << 24) | (p_dest->base_mid << 16) | (p_dest->base_low);
|
|
}
|
|
|
|
/*======================================================================*
|
|
init_descriptor
|
|
*----------------------------------------------------------------------*
|
|
初始化段描述符
|
|
*======================================================================*/
|
|
static void init_descriptor(DESCRIPTOR *p_desc, u32 base, u32 limit, u16 attribute)
|
|
{
|
|
p_desc->limit_low = limit & 0x0FFFF; // 段界限 1 (2 字节)
|
|
p_desc->base_low = base & 0x0FFFF; // 段基址 1 (2 字节)
|
|
p_desc->base_mid = (base >> 16) & 0x0FF; // 段基址 2 (1 字节)
|
|
p_desc->attr1 = attribute & 0xFF; // 属性 1
|
|
p_desc->limit_high_attr2 = ((limit >> 16) & 0x0F) |
|
|
((attribute >> 8) & 0xF0); // 段界限 2 + 属性 2
|
|
p_desc->base_high = (base >> 24) & 0x0FF; // 段基址 3 (1 字节)
|
|
}
|
|
|
|
/*======================================================================*
|
|
exception_handler
|
|
*----------------------------------------------------------------------*
|
|
异常处理
|
|
*======================================================================*/
|
|
void exception_handler(int vec_no, int err_code, int eip, int cs, int eflags)
|
|
{
|
|
int i;
|
|
int text_color = 0x74; /* 灰底红字 */
|
|
char err_description[][64] = {"#DE Divide Error",
|
|
"#DB RESERVED",
|
|
"— NMI Interrupt",
|
|
"#BP Breakpoint",
|
|
"#OF Overflow",
|
|
"#BR BOUND Range Exceeded",
|
|
"#UD Invalid Opcode (Undefined Opcode)",
|
|
"#NM Device Not Available (No Math Coprocessor)",
|
|
"#DF Double Fault",
|
|
" Coprocessor Segment Overrun (reserved)",
|
|
"#TS Invalid TSS",
|
|
"#NP Segment Not Present",
|
|
"#SS Stack-Segment Fault",
|
|
"#GP General Protection",
|
|
"#PF Page Fault",
|
|
"— (Intel reserved. Do not use.)",
|
|
"#MF x87 FPU Floating-Point Error (Math Fault)",
|
|
"#AC Alignment Check",
|
|
"#MC Machine Check",
|
|
"#XF SIMD Floating-Point Exception"};
|
|
|
|
|
|
kprintf("\x1b[31;47mException! --> ");
|
|
kprintf(err_description[vec_no]);
|
|
kprintf("\n\n");
|
|
kprintf("EFLAGS:\x1b[m");
|
|
kprintf("%x", eflags);
|
|
kprintf("\x1b[31;47mCS:\x1b[m");
|
|
kprintf("%x", cs);
|
|
kprintf("\x1b[31;47mEIP:\x1b[m");
|
|
kprintf("%p", eip);
|
|
|
|
if (err_code != 0xFFFFFFFF)
|
|
{
|
|
kprintf("\x1b[31;47mError code:\x1b[m");
|
|
kprintf("%x", err_code);
|
|
}
|
|
|
|
// added by xw, 18/12/19
|
|
kprintf("\n");
|
|
|
|
// added by xw, 18/12/19
|
|
p_proc_current->task.stat = KILLED;
|
|
}
|
|
|
|
/*======================================================================*
|
|
divide error handler
|
|
*======================================================================*/
|
|
// used for testing if a exception handler can be interrupted rightly, so it's
|
|
// not a real divide_error handler now. added by xw, 18/12/22
|
|
void divide_error_handler()
|
|
{
|
|
int vec_no, err_code, eip, cs, eflags;
|
|
int i, j;
|
|
|
|
asm volatile("mov 8(%%ebp), %0\n\t" // get vec_no from stack
|
|
"mov 12(%%ebp), %1\n\t" // get err_code from stack
|
|
"mov 16(%%ebp), %2\n\t" // get eip from stack
|
|
"mov 20(%%ebp), %3\n\t" // get cs from stack
|
|
"mov 24(%%ebp), %4\n\t" // get eflags from stack
|
|
: "=r"(vec_no), "=r"(err_code), "=r"(eip),
|
|
"=r"(cs), "=r"(eflags));
|
|
exception_handler(vec_no, err_code, eip, cs, eflags);
|
|
|
|
while (1)
|
|
{
|
|
kprintf("Loop in divide error handler...\n");
|
|
|
|
i = 100;
|
|
while (--i)
|
|
{
|
|
j = 1000;
|
|
while (--j)
|
|
{
|
|
}
|
|
}
|
|
}
|
|
}
|