/* *  linux/kernel/traps.c * *  (C) 1991  Linus Torvalds *//* * 'Traps.c' handles hardware traps and faults after we have saved some * state in 'asm.s'. Currently mostly a debugging-aid, will be extended * to mainly kill the offending process (probably by giving it a signal, * but possibly by killing it outright if necessary). */#include <string.h> #include <linux/head.h>#include <linux/sched.h>#include <linux/kernel.h>#include <asm/system.h>#include <asm/segment.h>#include <asm/io.h>#define get_seg_byte(seg,addr) ({ \register char __res; \__asm__("push %%fs;mov %%ax,%%fs;movb %%fs:%2,%%al;pop %%fs" \	:"=a" (__res):"0" (seg),"m" (*(addr))); \__res;})#define get_seg_long(seg,addr) ({ \register unsigned long __res; \__asm__("push %%fs;mov %%ax,%%fs;movl %%fs:%2,%%eax;pop %%fs" \	:"=a" (__res):"0" (seg),"m" (*(addr))); \__res;})#define _fs() ({ \register unsigned short __res; \__asm__("mov %%fs,%%ax":"=a" (__res):); \__res;})int do_exit(long code);void page_exception(void);void divide_error(void);void debug(void);void nmi(void);void int3(void);void overflow(void);void bounds(void);void invalid_op(void);void device_not_available(void);void double_fault(void);void coprocessor_segment_overrun(void);void invalid_TSS(void);void segment_not_present(void);void stack_segment(void);void general_protection(void);void page_fault(void);void coprocessor_error(void);void reserved(void);void parallel_interrupt(void);void irq13(void);static void die(char * str,long esp_ptr,long nr){	long * esp = (long *) esp_ptr;	int i;	printk("%s: %04x\n\r",str,nr&0xffff);	printk("EIP:\t%04x:%p\nEFLAGS:\t%p\nESP:\t%04x:%p\n",		esp[1],esp[0],esp[2],esp[4],esp[3]);	printk("fs: %04x\n",_fs());	printk("base: %p, limit: %p\n",get_base(current->ldt[1]),get_limit(0x17));	if (esp[4] == 0x17) {		printk("Stack: ");		for (i=0;i<4;i++)			printk("%p ",get_seg_long(0x17,i+(long *)esp[3]));		printk("\n");	}	str(i);	printk("Pid: %d, process nr: %d\n\r",current->pid,0xffff & i);	for(i=0;i<10;i++)		printk("%02x ",0xff & get_seg_byte(esp[1],(i+(char *)esp[0])));	printk("\n\r");	do_exit(11);		/* play segment exception */}void do_double_fault(long esp, long error_code){	die("double fault",esp,error_code);}void do_general_protection(long esp, long error_code){	die("general protection",esp,error_code);}void do_divide_error(long esp, long error_code){	die("divide error",esp,error_code);}void do_int3(long * esp, long error_code,		long fs,long es,long ds,		long ebp,long esi,long edi,		long edx,long ecx,long ebx,long eax){	int tr;	__asm__("str %%ax":"=a" (tr):"0" (0));	printk("eax\t\tebx\t\tecx\t\tedx\n\r%8x\t%8x\t%8x\t%8x\n\r",		eax,ebx,ecx,edx);	printk("esi\t\tedi\t\tebp\t\tesp\n\r%8x\t%8x\t%8x\t%8x\n\r",		esi,edi,ebp,(long) esp);	printk("\n\rds\tes\tfs\ttr\n\r%4x\t%4x\t%4x\t%4x\n\r",		ds,es,fs,tr);	printk("EIP: %8x   CS: %4x  EFLAGS: %8x\n\r",esp[0],esp[1],esp[2]);}void do_nmi(long esp, long error_code){	die("nmi",esp,error_code);}void do_debug(long esp, long error_code){	die("debug",esp,error_code);}void do_overflow(long esp, long error_code){	die("overflow",esp,error_code);}void do_bounds(long esp, long error_code){	die("bounds",esp,error_code);}void do_invalid_op(long esp, long error_code){	die("invalid operand",esp,error_code);}void do_device_not_available(long esp, long error_code){	die("device not available",esp,error_code);}void do_coprocessor_segment_overrun(long esp, long error_code){	die("coprocessor segment overrun",esp,error_code);}void do_invalid_TSS(long esp,long error_code){	die("invalid TSS",esp,error_code);}void do_segment_not_present(long esp,long error_code){	die("segment not present",esp,error_code);}void do_stack_segment(long esp,long error_code){	die("stack segment",esp,error_code);}void do_coprocessor_error(long esp, long error_code){	if (last_task_used_math != current)		return;	die("coprocessor error",esp,error_code);}void do_reserved(long esp, long error_code){	die("reserved (15,17-47) error",esp,error_code);}void trap_init(void){	int i;	set_trap_gate(0,&divide_error);	set_trap_gate(1,&debug);	set_trap_gate(2,&nmi);	set_system_gate(3,&int3);	/* int3-5 can be called from all */	set_system_gate(4,&overflow);	set_system_gate(5,&bounds);	set_trap_gate(6,&invalid_op);	set_trap_gate(7,&device_not_available);	set_trap_gate(8,&double_fault);	set_trap_gate(9,&coprocessor_segment_overrun);	set_trap_gate(10,&invalid_TSS);	set_trap_gate(11,&segment_not_present);	set_trap_gate(12,&stack_segment);	set_trap_gate(13,&general_protection);	set_trap_gate(14,&page_fault);	set_trap_gate(15,&reserved);	set_trap_gate(16,&coprocessor_error);	for (i=17;i<48;i++)		set_trap_gate(i,&reserved);	set_trap_gate(45,&irq13);	outb_p(inb_p(0x21)&0xfb,0x21);	outb(inb_p(0xA1)&0xdf,0xA1);	set_trap_gate(39,&parallel_interrupt);}