This source file includes following definitions.
- console_verbose
- die_if_kernel
- DO_ERROR
- do_nmi
- do_debug
- math_error
- do_coprocessor_error
- trap_init
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13 #include <linux/head.h>
14 #include <linux/sched.h>
15 #include <linux/kernel.h>
16 #include <linux/string.h>
17 #include <linux/errno.h>
18 #include <linux/ptrace.h>
19
20 #include <asm/system.h>
21 #include <asm/segment.h>
22 #include <asm/io.h>
23
24 static inline void console_verbose(void)
25 {
26 extern int console_loglevel;
27 console_loglevel = 15;
28 }
29
30 #define DO_ERROR(trapnr, signr, str, name, tsk) \
31 asmlinkage void do_##name(struct pt_regs * regs, long error_code) \
32 { \
33 tsk->tss.error_code = error_code; \
34 tsk->tss.trap_no = trapnr; \
35 if (signr == SIGTRAP && current->flags & PF_PTRACED) \
36 current->blocked &= ~(1 << (SIGTRAP-1)); \
37 send_sig(signr, tsk, 1); \
38 die_if_kernel(str,regs,error_code); \
39 }
40
41 #define get_seg_byte(seg,addr) ({ \
42 register unsigned char __res; \
43 __asm__("push %%fs;mov %%ax,%%fs;movb %%fs:%2,%%al;pop %%fs" \
44 :"=a" (__res):"0" (seg),"m" (*(addr))); \
45 __res;})
46
47 #define get_seg_long(seg,addr) ({ \
48 register unsigned long __res; \
49 __asm__("push %%fs;mov %%ax,%%fs;movl %%fs:%2,%%eax;pop %%fs" \
50 :"=a" (__res):"0" (seg),"m" (*(addr))); \
51 __res;})
52
53 #define _fs() ({ \
54 register unsigned short __res; \
55 __asm__("mov %%fs,%%ax":"=a" (__res):); \
56 __res;})
57
58 void page_exception(void);
59
60 asmlinkage void divide_error(void);
61 asmlinkage void debug(void);
62 asmlinkage void nmi(void);
63 asmlinkage void int3(void);
64 asmlinkage void overflow(void);
65 asmlinkage void bounds(void);
66 asmlinkage void invalid_op(void);
67 asmlinkage void device_not_available(void);
68 asmlinkage void double_fault(void);
69 asmlinkage void coprocessor_segment_overrun(void);
70 asmlinkage void invalid_TSS(void);
71 asmlinkage void segment_not_present(void);
72 asmlinkage void stack_segment(void);
73 asmlinkage void general_protection(void);
74 asmlinkage void page_fault(void);
75 asmlinkage void coprocessor_error(void);
76 asmlinkage void reserved(void);
77 asmlinkage void alignment_check(void);
78
79 void die_if_kernel(char * str, struct pt_regs * regs, long err)
80 {
81 int i;
82 unsigned long esp;
83 unsigned short ss;
84
85 esp = (unsigned long) ®s->esp;
86 ss = KERNEL_DS;
87 if ((regs->eflags & VM_MASK) || (3 & regs->cs) == 3)
88 return;
89 if (regs->cs & 3) {
90 esp = regs->esp;
91 ss = regs->ss;
92 }
93 console_verbose();
94 printk("%s: %04lx\n", str, err & 0xffff);
95 printk("EIP: %04x:%08lx\nEFLAGS: %08lx\n", 0xffff & regs->cs,regs->eip,regs->eflags);
96 printk("eax: %08lx ebx: %08lx ecx: %08lx edx: %08lx\n",
97 regs->eax, regs->ebx, regs->ecx, regs->edx);
98 printk("esi: %08lx edi: %08lx ebp: %08lx esp: %08lx\n",
99 regs->esi, regs->edi, regs->ebp, esp);
100 printk("ds: %04x es: %04x fs: %04x gs: %04x ss: %04x\n",
101 regs->ds, regs->es, regs->fs, regs->gs, ss);
102 store_TR(i);
103 if (STACK_MAGIC != *(unsigned long *)current->kernel_stack_page)
104 printk("Corrupted stack page\n");
105 printk("Process %s (pid: %d, process nr: %d, stackpage=%08lx)\nStack: ",
106 current->comm, current->pid, 0xffff & i, current->kernel_stack_page);
107 for(i=0;i<5;i++)
108 printk("%08lx ", get_seg_long(ss,(i+(unsigned long *)esp)));
109 printk("\nCode: ");
110 for(i=0;i<20;i++)
111 printk("%02x ",0xff & get_seg_byte(regs->cs,(i+(char *)regs->eip)));
112 printk("\n");
113 do_exit(SIGSEGV);
114 }
115
116 DO_ERROR( 0, SIGFPE, "divide error", divide_error, current)
117 DO_ERROR( 3, SIGTRAP, "int3", int3, current)
118 DO_ERROR( 4, SIGSEGV, "overflow", overflow, current)
119 DO_ERROR( 5, SIGSEGV, "bounds", bounds, current)
120 DO_ERROR( 6, SIGILL, "invalid operand", invalid_op, current)
121 DO_ERROR( 7, SIGSEGV, "device not available", device_not_available, current)
122 DO_ERROR( 8, SIGSEGV, "double fault", double_fault, current)
123 DO_ERROR( 9, SIGFPE, "coprocessor segment overrun", coprocessor_segment_overrun, last_task_used_math)
124 DO_ERROR(10, SIGSEGV, "invalid TSS", invalid_TSS, current)
125 DO_ERROR(11, SIGBUS, "segment not present", segment_not_present, current)
126 DO_ERROR(12, SIGBUS, "stack segment", stack_segment, current)
127 DO_ERROR(15, SIGSEGV, "reserved", reserved, current)
128 DO_ERROR(17, SIGSEGV, "alignment check", alignment_check, current)
129
130 asmlinkage void do_general_protection(struct pt_regs * regs, long error_code)
131 {
132 int signr = SIGSEGV;
133
134 if (regs->eflags & VM_MASK) {
135 handle_vm86_fault((struct vm86_regs *) regs, error_code);
136 return;
137 }
138 die_if_kernel("general protection",regs,error_code);
139 switch (get_seg_byte(regs->cs, (char *)regs->eip)) {
140 case 0xCD:
141 case 0xF4:
142 case 0xFA:
143 case 0xFB:
144 signr = SIGILL;
145 }
146 current->tss.error_code = error_code;
147 current->tss.trap_no = 13;
148 send_sig(signr, current, 1);
149 }
150
151 asmlinkage void do_nmi(struct pt_regs * regs, long error_code)
152 {
153 printk("Uhhuh. NMI received. Dazed and confused, but trying to continue\n");
154 printk("You probably have a hardware problem with your RAM chips\n");
155 }
156
157 asmlinkage void do_debug(struct pt_regs * regs, long error_code)
158 {
159 if (regs->eflags & VM_MASK) {
160 handle_vm86_debug((struct vm86_regs *) regs, error_code);
161 return;
162 }
163 if (current->flags & PF_PTRACED)
164 current->blocked &= ~(1 << (SIGTRAP-1));
165 send_sig(SIGTRAP, current, 1);
166 current->tss.trap_no = 1;
167 current->tss.error_code = error_code;
168 if ((regs->cs & 3) == 0) {
169
170 __asm__("movl %0,%%db7"
171 :
172 : "r" (0));
173 return;
174 }
175 die_if_kernel("debug",regs,error_code);
176 }
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193 void math_error(void)
194 {
195 struct i387_hard_struct * env;
196
197 clts();
198 if (!last_task_used_math) {
199 __asm__("fnclex");
200 return;
201 }
202 env = &last_task_used_math->tss.i387.hard;
203 send_sig(SIGFPE, last_task_used_math, 1);
204 last_task_used_math->tss.trap_no = 16;
205 last_task_used_math->tss.error_code = 0;
206 __asm__ __volatile__("fnsave %0":"=m" (*env));
207 last_task_used_math = NULL;
208 stts();
209 env->fcs = (env->swd & 0x0000ffff) | (env->fcs & 0xffff0000);
210 env->fos = env->twd;
211 env->swd &= 0xffff3800;
212 env->twd = 0xffffffff;
213 }
214
215 asmlinkage void do_coprocessor_error(struct pt_regs * regs, long error_code)
216 {
217 ignore_irq13 = 1;
218 math_error();
219 }
220
221 void trap_init(void)
222 {
223 int i;
224
225 set_trap_gate(0,÷_error);
226 set_trap_gate(1,&debug);
227 set_trap_gate(2,&nmi);
228 set_system_gate(3,&int3);
229 set_system_gate(4,&overflow);
230 set_system_gate(5,&bounds);
231 set_trap_gate(6,&invalid_op);
232 set_trap_gate(7,&device_not_available);
233 set_trap_gate(8,&double_fault);
234 set_trap_gate(9,&coprocessor_segment_overrun);
235 set_trap_gate(10,&invalid_TSS);
236 set_trap_gate(11,&segment_not_present);
237 set_trap_gate(12,&stack_segment);
238 set_trap_gate(13,&general_protection);
239 set_trap_gate(14,&page_fault);
240 set_trap_gate(15,&reserved);
241 set_trap_gate(16,&coprocessor_error);
242 set_trap_gate(17,&alignment_check);
243 for (i=18;i<48;i++)
244 set_trap_gate(i,&reserved);
245 }