Annotation of linux/kernel/traps.c, revision 1.1.1.7
1.1 root 1: /*
1.1.1.2 root 2: * linux/kernel/traps.c
3: *
1.1.1.6 root 4: * Copyright (C) 1991, 1992 Linus Torvalds
1.1.1.2 root 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 <linux/head.h>
14: #include <linux/sched.h>
15: #include <linux/kernel.h>
1.1.1.6 root 16: #include <linux/string.h>
17: #include <linux/errno.h>
18:
1.1 root 19: #include <asm/system.h>
20: #include <asm/segment.h>
1.1.1.2 root 21: #include <asm/io.h>
1.1 root 22:
23: #define get_seg_byte(seg,addr) ({ \
24: register char __res; \
25: __asm__("push %%fs;mov %%ax,%%fs;movb %%fs:%2,%%al;pop %%fs" \
26: :"=a" (__res):"0" (seg),"m" (*(addr))); \
27: __res;})
28:
29: #define get_seg_long(seg,addr) ({ \
30: register unsigned long __res; \
31: __asm__("push %%fs;mov %%ax,%%fs;movl %%fs:%2,%%eax;pop %%fs" \
32: :"=a" (__res):"0" (seg),"m" (*(addr))); \
33: __res;})
34:
35: #define _fs() ({ \
36: register unsigned short __res; \
37: __asm__("mov %%fs,%%ax":"=a" (__res):); \
38: __res;})
39:
40: void page_exception(void);
41:
42: void divide_error(void);
43: void debug(void);
44: void nmi(void);
45: void int3(void);
46: void overflow(void);
47: void bounds(void);
48: void invalid_op(void);
49: void device_not_available(void);
50: void double_fault(void);
51: void coprocessor_segment_overrun(void);
52: void invalid_TSS(void);
53: void segment_not_present(void);
54: void stack_segment(void);
55: void general_protection(void);
56: void page_fault(void);
57: void coprocessor_error(void);
58: void reserved(void);
1.1.1.3 root 59: void alignment_check(void);
1.1 root 60:
1.1.1.6 root 61: static void die_if_kernel(char * str,long esp_ptr,long nr)
1.1 root 62: {
63: long * esp = (long *) esp_ptr;
64: int i;
65:
1.1.1.7 ! root 66: if ((esp[2] & VM_MASK) || ((0xffff & esp[1]) == 0xf))
1.1.1.6 root 67: return;
1.1 root 68: printk("%s: %04x\n\r",str,nr&0xffff);
1.1.1.4 root 69: printk("EIP: %04x:%p\nEFLAGS: %p\n", 0xffff & esp[1],esp[0],esp[2]);
1.1 root 70: printk("fs: %04x\n",_fs());
71: printk("base: %p, limit: %p\n",get_base(current->ldt[1]),get_limit(0x17));
72: str(i);
73: printk("Pid: %d, process nr: %d\n\r",current->pid,0xffff & i);
74: for(i=0;i<10;i++)
75: printk("%02x ",0xff & get_seg_byte(esp[1],(i+(char *)esp[0])));
76: printk("\n\r");
1.1.1.6 root 77: do_exit(SIGSEGV);
1.1 root 78: }
79:
80: void do_double_fault(long esp, long error_code)
81: {
1.1.1.6 root 82: send_sig(SIGSEGV, current, 1);
83: die_if_kernel("double fault",esp,error_code);
1.1 root 84: }
85:
86: void do_general_protection(long esp, long error_code)
87: {
1.1.1.6 root 88: send_sig(SIGSEGV, current, 1);
89: die_if_kernel("general protection",esp,error_code);
1.1 root 90: }
91:
1.1.1.3 root 92: void do_alignment_check(long esp, long error_code)
93: {
1.1.1.6 root 94: send_sig(SIGSEGV, current, 1);
95: die_if_kernel("alignment check",esp,error_code);
1.1.1.3 root 96: }
97:
1.1 root 98: void do_divide_error(long esp, long error_code)
99: {
1.1.1.6 root 100: send_sig(SIGFPE, current, 1);
101: die_if_kernel("divide error",esp,error_code);
1.1 root 102: }
103:
1.1.1.4 root 104: void do_int3(long esp, long error_code)
105: {
1.1.1.6 root 106: send_sig(SIGTRAP, current, 1);
107: die_if_kernel("int3",esp,error_code);
1.1 root 108: }
109:
110: void do_nmi(long esp, long error_code)
111: {
1.1.1.6 root 112: printk("Uhhuh. NMI received. Dazed and confused, but trying to continue\n");
1.1 root 113: }
114:
115: void do_debug(long esp, long error_code)
116: {
1.1.1.6 root 117: send_sig(SIGTRAP, current, 1);
118: die_if_kernel("debug",esp,error_code);
1.1 root 119: }
120:
121: void do_overflow(long esp, long error_code)
122: {
1.1.1.6 root 123: send_sig(SIGSEGV, current, 1);
124: die_if_kernel("overflow",esp,error_code);
1.1 root 125: }
126:
127: void do_bounds(long esp, long error_code)
128: {
1.1.1.6 root 129: send_sig(SIGSEGV, current, 1);
130: die_if_kernel("bounds",esp,error_code);
1.1 root 131: }
132:
133: void do_invalid_op(long esp, long error_code)
134: {
1.1.1.6 root 135: send_sig(SIGILL, current, 1);
136: die_if_kernel("invalid operand",esp,error_code);
1.1 root 137: }
138:
139: void do_device_not_available(long esp, long error_code)
140: {
1.1.1.6 root 141: send_sig(SIGSEGV, current, 1);
142: die_if_kernel("device not available",esp,error_code);
1.1 root 143: }
144:
145: void do_coprocessor_segment_overrun(long esp, long error_code)
146: {
1.1.1.6 root 147: send_sig(SIGFPE, last_task_used_math, 1);
148: die_if_kernel("coprocessor segment overrun",esp,error_code);
1.1 root 149: }
150:
151: void do_invalid_TSS(long esp,long error_code)
152: {
1.1.1.6 root 153: send_sig(SIGSEGV, current, 1);
154: die_if_kernel("invalid TSS",esp,error_code);
1.1 root 155: }
156:
157: void do_segment_not_present(long esp,long error_code)
158: {
1.1.1.6 root 159: send_sig(SIGSEGV, current, 1);
160: die_if_kernel("segment not present",esp,error_code);
1.1 root 161: }
162:
163: void do_stack_segment(long esp,long error_code)
164: {
1.1.1.6 root 165: send_sig(SIGSEGV, current, 1);
166: die_if_kernel("stack segment",esp,error_code);
1.1 root 167: }
168:
169: void do_coprocessor_error(long esp, long error_code)
170: {
1.1.1.6 root 171: send_sig(SIGFPE, last_task_used_math, 1);
172: __asm__("fnclex");
1.1 root 173: }
174:
175: void do_reserved(long esp, long error_code)
176: {
1.1.1.6 root 177: send_sig(SIGSEGV, current, 1);
178: die_if_kernel("reserved (15,17-47) error",esp,error_code);
1.1 root 179: }
180:
181: void trap_init(void)
182: {
183: int i;
184:
185: set_trap_gate(0,÷_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);
1.1.1.3 root 202: set_trap_gate(17,&alignment_check);
203: for (i=18;i<48;i++)
1.1 root 204: set_trap_gate(i,&reserved);
205: }
unix.superglobalmegacorp.com
![[BACK]](/cvsweb/icons/back.gif){kind=icon}
Return to traps.c CVS log ![[TXT]](/cvsweb/icons/text.gif){kind=icon}
![[DIR]](/cvsweb/icons/dir.gif){kind=icon}
Up to [Early Linux] / linux / kernel