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1.1 root 1: /*
1.1.1.2 root 2: * linux/kernel/traps.c
3: *
4: * (C) 1991 Linus Torvalds
5: */
6:
7: /*
1.1 root 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>
1.1.1.2 root 20: #include <asm/io.h>
1.1 root 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: void page_exception(void);
40:
41: void divide_error(void);
42: void debug(void);
43: void nmi(void);
44: void int3(void);
45: void overflow(void);
46: void bounds(void);
47: void invalid_op(void);
48: void device_not_available(void);
49: void double_fault(void);
50: void coprocessor_segment_overrun(void);
51: void invalid_TSS(void);
52: void segment_not_present(void);
53: void stack_segment(void);
54: void general_protection(void);
55: void page_fault(void);
56: void coprocessor_error(void);
57: void reserved(void);
1.1.1.2 root 58: void parallel_interrupt(void);
59: void irq13(void);
1.1.1.3 ! root 60: void alignment_check(void);
1.1 root 61:
62: static void die(char * str,long esp_ptr,long nr)
63: {
64: long * esp = (long *) esp_ptr;
65: int i;
66:
67: printk("%s: %04x\n\r",str,nr&0xffff);
68: printk("EIP:\t%04x:%p\nEFLAGS:\t%p\nESP:\t%04x:%p\n",
69: esp[1],esp[0],esp[2],esp[4],esp[3]);
70: printk("fs: %04x\n",_fs());
71: printk("base: %p, limit: %p\n",get_base(current->ldt[1]),get_limit(0x17));
72: if (esp[4] == 0x17) {
73: printk("Stack: ");
74: for (i=0;i<4;i++)
75: printk("%p ",get_seg_long(0x17,i+(long *)esp[3]));
76: printk("\n");
77: }
78: str(i);
79: printk("Pid: %d, process nr: %d\n\r",current->pid,0xffff & i);
80: for(i=0;i<10;i++)
81: printk("%02x ",0xff & get_seg_byte(esp[1],(i+(char *)esp[0])));
82: printk("\n\r");
83: do_exit(11); /* play segment exception */
84: }
85:
86: void do_double_fault(long esp, long error_code)
87: {
88: die("double fault",esp,error_code);
89: }
90:
91: void do_general_protection(long esp, long error_code)
92: {
93: die("general protection",esp,error_code);
94: }
95:
1.1.1.3 ! root 96: void do_alignment_check(long esp, long error_code)
! 97: {
! 98: die("alignment check",esp,error_code);
! 99: }
! 100:
1.1 root 101: void do_divide_error(long esp, long error_code)
102: {
103: die("divide error",esp,error_code);
104: }
105:
106: void do_int3(long * esp, long error_code,
107: long fs,long es,long ds,
108: long ebp,long esi,long edi,
109: long edx,long ecx,long ebx,long eax)
110: {
111: int tr;
112:
113: __asm__("str %%ax":"=a" (tr):"0" (0));
114: printk("eax\t\tebx\t\tecx\t\tedx\n\r%8x\t%8x\t%8x\t%8x\n\r",
115: eax,ebx,ecx,edx);
116: printk("esi\t\tedi\t\tebp\t\tesp\n\r%8x\t%8x\t%8x\t%8x\n\r",
117: esi,edi,ebp,(long) esp);
118: printk("\n\rds\tes\tfs\ttr\n\r%4x\t%4x\t%4x\t%4x\n\r",
119: ds,es,fs,tr);
120: printk("EIP: %8x CS: %4x EFLAGS: %8x\n\r",esp[0],esp[1],esp[2]);
121: }
122:
123: void do_nmi(long esp, long error_code)
124: {
125: die("nmi",esp,error_code);
126: }
127:
128: void do_debug(long esp, long error_code)
129: {
130: die("debug",esp,error_code);
131: }
132:
133: void do_overflow(long esp, long error_code)
134: {
135: die("overflow",esp,error_code);
136: }
137:
138: void do_bounds(long esp, long error_code)
139: {
140: die("bounds",esp,error_code);
141: }
142:
143: void do_invalid_op(long esp, long error_code)
144: {
145: die("invalid operand",esp,error_code);
146: }
147:
148: void do_device_not_available(long esp, long error_code)
149: {
150: die("device not available",esp,error_code);
151: }
152:
153: void do_coprocessor_segment_overrun(long esp, long error_code)
154: {
155: die("coprocessor segment overrun",esp,error_code);
156: }
157:
158: void do_invalid_TSS(long esp,long error_code)
159: {
160: die("invalid TSS",esp,error_code);
161: }
162:
163: void do_segment_not_present(long esp,long error_code)
164: {
165: die("segment not present",esp,error_code);
166: }
167:
168: void do_stack_segment(long esp,long error_code)
169: {
170: die("stack segment",esp,error_code);
171: }
172:
173: void do_coprocessor_error(long esp, long error_code)
174: {
1.1.1.2 root 175: if (last_task_used_math != current)
176: return;
1.1 root 177: die("coprocessor error",esp,error_code);
178: }
179:
180: void do_reserved(long esp, long error_code)
181: {
1.1.1.2 root 182: die("reserved (15,17-47) error",esp,error_code);
1.1 root 183: }
184:
185: void trap_init(void)
186: {
187: int i;
188:
189: set_trap_gate(0,÷_error);
190: set_trap_gate(1,&debug);
191: set_trap_gate(2,&nmi);
192: set_system_gate(3,&int3); /* int3-5 can be called from all */
193: set_system_gate(4,&overflow);
194: set_system_gate(5,&bounds);
195: set_trap_gate(6,&invalid_op);
196: set_trap_gate(7,&device_not_available);
197: set_trap_gate(8,&double_fault);
198: set_trap_gate(9,&coprocessor_segment_overrun);
199: set_trap_gate(10,&invalid_TSS);
200: set_trap_gate(11,&segment_not_present);
201: set_trap_gate(12,&stack_segment);
202: set_trap_gate(13,&general_protection);
203: set_trap_gate(14,&page_fault);
204: set_trap_gate(15,&reserved);
205: set_trap_gate(16,&coprocessor_error);
1.1.1.3 ! root 206: set_trap_gate(17,&alignment_check);
! 207: for (i=18;i<48;i++)
1.1 root 208: set_trap_gate(i,&reserved);
1.1.1.2 root 209: set_trap_gate(45,&irq13);
210: outb_p(inb_p(0x21)&0xfb,0x21);
211: outb(inb_p(0xA1)&0xdf,0xA1);
212: set_trap_gate(39,¶llel_interrupt);
1.1 root 213: }
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