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1.1 root 1: /*
2: * 'Traps.c' handles hardware traps and faults after we have saved some
3: * state in 'asm.s'. Currently mostly a debugging-aid, will be extended
4: * to mainly kill the offending process (probably by giving it a signal,
5: * but possibly by killing it outright if necessary).
6: */
7: #include <string.h>
8:
9: #include <linux/head.h>
10: #include <linux/sched.h>
11: #include <linux/kernel.h>
12: #include <asm/system.h>
13: #include <asm/segment.h>
14:
15: #define get_seg_byte(seg,addr) ({ \
16: register char __res; \
17: __asm__("push %%fs;mov %%ax,%%fs;movb %%fs:%2,%%al;pop %%fs" \
18: :"=a" (__res):"0" (seg),"m" (*(addr))); \
19: __res;})
20:
21: #define get_seg_long(seg,addr) ({ \
22: register unsigned long __res; \
23: __asm__("push %%fs;mov %%ax,%%fs;movl %%fs:%2,%%eax;pop %%fs" \
24: :"=a" (__res):"0" (seg),"m" (*(addr))); \
25: __res;})
26:
27: #define _fs() ({ \
28: register unsigned short __res; \
29: __asm__("mov %%fs,%%ax":"=a" (__res):); \
30: __res;})
31:
32: int do_exit(long code);
33:
34: void page_exception(void);
35:
36: void divide_error(void);
37: void debug(void);
38: void nmi(void);
39: void int3(void);
40: void overflow(void);
41: void bounds(void);
42: void invalid_op(void);
43: void device_not_available(void);
44: void double_fault(void);
45: void coprocessor_segment_overrun(void);
46: void invalid_TSS(void);
47: void segment_not_present(void);
48: void stack_segment(void);
49: void general_protection(void);
50: void page_fault(void);
51: void coprocessor_error(void);
52: void reserved(void);
53:
54: static void die(char * str,long esp_ptr,long nr)
55: {
56: long * esp = (long *) esp_ptr;
57: int i;
58:
59: printk("%s: %04x\n\r",str,nr&0xffff);
60: printk("EIP:\t%04x:%p\nEFLAGS:\t%p\nESP:\t%04x:%p\n",
61: esp[1],esp[0],esp[2],esp[4],esp[3]);
62: printk("fs: %04x\n",_fs());
63: printk("base: %p, limit: %p\n",get_base(current->ldt[1]),get_limit(0x17));
64: if (esp[4] == 0x17) {
65: printk("Stack: ");
66: for (i=0;i<4;i++)
67: printk("%p ",get_seg_long(0x17,i+(long *)esp[3]));
68: printk("\n");
69: }
70: str(i);
71: printk("Pid: %d, process nr: %d\n\r",current->pid,0xffff & i);
72: for(i=0;i<10;i++)
73: printk("%02x ",0xff & get_seg_byte(esp[1],(i+(char *)esp[0])));
74: printk("\n\r");
75: do_exit(11); /* play segment exception */
76: }
77:
78: void do_double_fault(long esp, long error_code)
79: {
80: die("double fault",esp,error_code);
81: }
82:
83: void do_general_protection(long esp, long error_code)
84: {
85: die("general protection",esp,error_code);
86: }
87:
88: void do_divide_error(long esp, long error_code)
89: {
90: die("divide error",esp,error_code);
91: }
92:
93: void do_int3(long * esp, long error_code,
94: long fs,long es,long ds,
95: long ebp,long esi,long edi,
96: long edx,long ecx,long ebx,long eax)
97: {
98: int tr;
99:
100: __asm__("str %%ax":"=a" (tr):"0" (0));
101: printk("eax\t\tebx\t\tecx\t\tedx\n\r%8x\t%8x\t%8x\t%8x\n\r",
102: eax,ebx,ecx,edx);
103: printk("esi\t\tedi\t\tebp\t\tesp\n\r%8x\t%8x\t%8x\t%8x\n\r",
104: esi,edi,ebp,(long) esp);
105: printk("\n\rds\tes\tfs\ttr\n\r%4x\t%4x\t%4x\t%4x\n\r",
106: ds,es,fs,tr);
107: printk("EIP: %8x CS: %4x EFLAGS: %8x\n\r",esp[0],esp[1],esp[2]);
108: }
109:
110: void do_nmi(long esp, long error_code)
111: {
112: die("nmi",esp,error_code);
113: }
114:
115: void do_debug(long esp, long error_code)
116: {
117: die("debug",esp,error_code);
118: }
119:
120: void do_overflow(long esp, long error_code)
121: {
122: die("overflow",esp,error_code);
123: }
124:
125: void do_bounds(long esp, long error_code)
126: {
127: die("bounds",esp,error_code);
128: }
129:
130: void do_invalid_op(long esp, long error_code)
131: {
132: die("invalid operand",esp,error_code);
133: }
134:
135: void do_device_not_available(long esp, long error_code)
136: {
137: die("device not available",esp,error_code);
138: }
139:
140: void do_coprocessor_segment_overrun(long esp, long error_code)
141: {
142: die("coprocessor segment overrun",esp,error_code);
143: }
144:
145: void do_invalid_TSS(long esp,long error_code)
146: {
147: die("invalid TSS",esp,error_code);
148: }
149:
150: void do_segment_not_present(long esp,long error_code)
151: {
152: die("segment not present",esp,error_code);
153: }
154:
155: void do_stack_segment(long esp,long error_code)
156: {
157: die("stack segment",esp,error_code);
158: }
159:
160: void do_coprocessor_error(long esp, long error_code)
161: {
162: die("coprocessor error",esp,error_code);
163: }
164:
165: void do_reserved(long esp, long error_code)
166: {
167: die("reserved (15,17-31) error",esp,error_code);
168: }
169:
170: void trap_init(void)
171: {
172: int i;
173:
174: set_trap_gate(0,÷_error);
175: set_trap_gate(1,&debug);
176: set_trap_gate(2,&nmi);
177: set_system_gate(3,&int3); /* int3-5 can be called from all */
178: set_system_gate(4,&overflow);
179: set_system_gate(5,&bounds);
180: set_trap_gate(6,&invalid_op);
181: set_trap_gate(7,&device_not_available);
182: set_trap_gate(8,&double_fault);
183: set_trap_gate(9,&coprocessor_segment_overrun);
184: set_trap_gate(10,&invalid_TSS);
185: set_trap_gate(11,&segment_not_present);
186: set_trap_gate(12,&stack_segment);
187: set_trap_gate(13,&general_protection);
188: set_trap_gate(14,&page_fault);
189: set_trap_gate(15,&reserved);
190: set_trap_gate(16,&coprocessor_error);
191: for (i=17;i<32;i++)
192: set_trap_gate(i,&reserved);
193: /* __asm__("movl $0x3ff000,%%eax\n\t"
194: "movl %%eax,%%db0\n\t"
195: "movl $0x000d0303,%%eax\n\t"
196: "movl %%eax,%%db7"
197: :::"ax");*/
198: }
199:
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