kernel/traps.c

   1 /*
   2  *  linux/kernel/traps.c
   3  *
   4  *  (C) 1991  Linus Torvalds
   5  */
   6
   7 /*
   8  * 'Traps.c' handles hardware traps and faults after we have saved some
   9  * state in 'asm.s'. Currently mostly a debugging-aid, will be extended
  10  * to mainly kill the offending process (probably by giving it a signal,
  11  * but possibly by killing it outright if necessary).
  12  */
  13 #include <string.h>
  14
  15 #include <linux/head.h>
  16 #include <linux/sched.h>
  17 #include <linux/kernel.h>
  18 #include <asm/system.h>
  19 #include <asm/segment.h>
  20 #include <asm/io.h>
  21
  22 #define get_seg_byte(seg,addr) ({ \
  23 register char __res; \
  24 __asm__("push %%fs;mov %%ax,%%fs;movb %%fs:%2,%%al;pop %%fs" \
  25         :"=a" (__res):"0" (seg),"m" (*(addr))); \
  26 __res;})
  27
  28 #define get_seg_long(seg,addr) ({ \
  29 register unsigned long __res; \
  30 __asm__("push %%fs;mov %%ax,%%fs;movl %%fs:%2,%%eax;pop %%fs" \
  31         :"=a" (__res):"0" (seg),"m" (*(addr))); \
  32 __res;})
  33
  34 #define _fs() ({ \
  35 register unsigned short __res; \
  36 __asm__("mov %%fs,%%ax":"=a" (__res):); \
  37 __res;})
  38
  39 int do_exit(long code);
  40
  41 void page_exception(void);
  42
  43 void divide_error(void);
  44 void debug(void);
  45 void nmi(void);
  46 void int3(void);
  47 void overflow(void);
  48 void bounds(void);
  49 void invalid_op(void);
  50 void device_not_available(void);
  51 void double_fault(void);
  52 void coprocessor_segment_overrun(void);
  53 void invalid_TSS(void);
  54 void segment_not_present(void);
  55 void stack_segment(void);
  56 void general_protection(void);
  57 void page_fault(void);
  58 void coprocessor_error(void);
  59 void reserved(void);
  60 void parallel_interrupt(void);
  61 void irq13(void);
  62
  63 static void die(char * str,long esp_ptr,long nr)
  64 {
  65         long * esp = (long *) esp_ptr;
  66         int i;
  67
  68         printk("%s: %04x\n\r",str,nr&0xffff);
  69         printk("EIP:\t%04x:%p\nEFLAGS:\t%p\nESP:\t%04x:%p\n",
  70                 esp[1],esp[0],esp[2],esp[4],esp[3]);
  71         printk("fs: %04x\n",_fs());
  72         printk("base: %p, limit: %p\n",get_base(current->ldt[1]),get_limit(0x17));
  73         if (esp[4] == 0x17) {
  74                 printk("Stack: ");
  75                 for (i=0;i<4;i++)
  76                         printk("%p ",get_seg_long(0x17,i+(long *)esp[3]));
  77                 printk("\n");
  78         }
  79         str(i);
  80         printk("Pid: %d, process nr: %d\n\r",current->pid,0xffff & i);
  81         for(i=0;i<10;i++)
  82                 printk("%02x ",0xff & get_seg_byte(esp[1],(i+(char *)esp[0])));
  83         printk("\n\r");
  84         do_exit(11);            /* play segment exception */
  85 }
  86
  87 void do_double_fault(long esp, long error_code)
  88 {
  89         die("double fault",esp,error_code);
  90 }
  91
  92 void do_general_protection(long esp, long error_code)
  93 {
  94         die("general protection",esp,error_code);
  95 }
  96
  97 void do_divide_error(long esp, long error_code)
  98 {
  99         die("divide error",esp,error_code);
 100 }
 101
 102 void do_int3(long * esp, long error_code,
 103                 long fs,long es,long ds,
 104                 long ebp,long esi,long edi,
 105                 long edx,long ecx,long ebx,long eax)
 106 {
 107         int tr;
 108
 109         __asm__("str %%ax":"=a" (tr):"0" (0));
 110         printk("eax\t\tebx\t\tecx\t\tedx\n\r%8x\t%8x\t%8x\t%8x\n\r",
 111                 eax,ebx,ecx,edx);
 112         printk("esi\t\tedi\t\tebp\t\tesp\n\r%8x\t%8x\t%8x\t%8x\n\r",
 113                 esi,edi,ebp,(long) esp);
 114         printk("\n\rds\tes\tfs\ttr\n\r%4x\t%4x\t%4x\t%4x\n\r",
 115                 ds,es,fs,tr);
 116         printk("EIP: %8x   CS: %4x  EFLAGS: %8x\n\r",esp[0],esp[1],esp[2]);
 117 }
 118
 119 void do_nmi(long esp, long error_code)
 120 {
 121         die("nmi",esp,error_code);
 122 }
 123
 124 void do_debug(long esp, long error_code)
 125 {
 126         die("debug",esp,error_code);
 127 }
 128
 129 void do_overflow(long esp, long error_code)
 130 {
 131         die("overflow",esp,error_code);
 132 }
 133
 134 void do_bounds(long esp, long error_code)
 135 {
 136         die("bounds",esp,error_code);
 137 }
 138
 139 void do_invalid_op(long esp, long error_code)
 140 {
 141         die("invalid operand",esp,error_code);
 142 }
 143
 144 void do_device_not_available(long esp, long error_code)
 145 {
 146         die("device not available",esp,error_code);
 147 }
 148
 149 void do_coprocessor_segment_overrun(long esp, long error_code)
 150 {
 151         die("coprocessor segment overrun",esp,error_code);
 152 }
 153
 154 void do_invalid_TSS(long esp,long error_code)
 155 {
 156         die("invalid TSS",esp,error_code);
 157 }
 158
 159 void do_segment_not_present(long esp,long error_code)
 160 {
 161         die("segment not present",esp,error_code);
 162 }
 163
 164 void do_stack_segment(long esp,long error_code)
 165 {
 166         die("stack segment",esp,error_code);
 167 }
 168
 169 void do_coprocessor_error(long esp, long error_code)
 170 {
 171         if (last_task_used_math != current)
 172                 return;
 173         die("coprocessor error",esp,error_code);
 174 }
 175
 176 void do_reserved(long esp, long error_code)
 177 {
 178         die("reserved (15,17-47) error",esp,error_code);
 179 }
 180
 181 void trap_init(void)
 182 {
 183         int i;
 184
 185         set_trap_gate(0,&divide_error);
 186         set_trap_gate(1,&debug);
 187         set_trap_gate(2,&nmi);
 188         set_system_gate(3,&int3);       /* int3-5 can be called from all */
 189         set_system_gate(4,&overflow);
 190         set_system_gate(5,&bounds);
 191         set_trap_gate(6,&invalid_op);
 192         set_trap_gate(7,&device_not_available);
 193         set_trap_gate(8,&double_fault);
 194         set_trap_gate(9,&coprocessor_segment_overrun);
 195         set_trap_gate(10,&invalid_TSS);
 196         set_trap_gate(11,&segment_not_present);
 197         set_trap_gate(12,&stack_segment);
 198         set_trap_gate(13,&general_protection);
 199         set_trap_gate(14,&page_fault);
 200         set_trap_gate(15,&reserved);
 201         set_trap_gate(16,&coprocessor_error);
 202         for (i=17;i<48;i++)
 203                 set_trap_gate(i,&reserved);
 204         set_trap_gate(45,&irq13);
 205         outb_p(inb_p(0x21)&0xfb,0x21);
 206         outb(inb_p(0xA1)&0xdf,0xA1);
 207         set_trap_gate(39,&parallel_interrupt);
 208 }