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/segment.h>
19 #include <linux/ptrace.h>
20
21 #include <asm/system.h>
22 #include <asm/segment.h>
23 #include <asm/io.h>
24
25 static inline void console_verbose(void)
26 {
27 extern int console_loglevel;
28 console_loglevel = 15;
29 }
30
31 #define DO_ERROR(trapnr, signr, str, name, tsk) \
32 asmlinkage void do_##name(struct pt_regs * regs, long error_code) \
33 { \
34 tsk->tss.error_code = error_code; \
35 tsk->tss.trap_no = trapnr; \
36 if (signr == SIGTRAP && current->flags & PF_PTRACED) \
37 current->blocked &= ~(1 << (SIGTRAP-1)); \
38 send_sig(signr, tsk, 1); \
39 die_if_kernel(str,regs,error_code); \
40 }
41
42 #define get_seg_byte(seg,addr) ({ \
43 register char __res; \
44 __asm__("push %%fs;mov %%ax,%%fs;movb %%fs:%2,%%al;pop %%fs" \
45 :"=a" (__res):"0" (seg),"m" (*(addr))); \
46 __res;})
47
48 #define get_seg_long(seg,addr) ({ \
49 register unsigned long __res; \
50 __asm__("push %%fs;mov %%ax,%%fs;movl %%fs:%2,%%eax;pop %%fs" \
51 :"=a" (__res):"0" (seg),"m" (*(addr))); \
52 __res;})
53
54 #define _fs() ({ \
55 register unsigned short __res; \
56 __asm__("mov %%fs,%%ax":"=a" (__res):); \
57 __res;})
58
59 void page_exception(void);
60
61 asmlinkage void divide_error(void);
62 asmlinkage void debug(void);
63 asmlinkage void nmi(void);
64 asmlinkage void int3(void);
65 asmlinkage void overflow(void);
66 asmlinkage void bounds(void);
67 asmlinkage void invalid_op(void);
68 asmlinkage void device_not_available(void);
69 asmlinkage void double_fault(void);
70 asmlinkage void coprocessor_segment_overrun(void);
71 asmlinkage void invalid_TSS(void);
72 asmlinkage void segment_not_present(void);
73 asmlinkage void stack_segment(void);
74 asmlinkage void general_protection(void);
75 asmlinkage void page_fault(void);
76 asmlinkage void coprocessor_error(void);
77 asmlinkage void reserved(void);
78 asmlinkage void alignment_check(void);
79
80 void die_if_kernel(char * str, struct pt_regs * regs, long err)
81 {
82 int i;
83 unsigned long esp;
84 unsigned short ss;
85
86 esp = (unsigned long) ®s->esp;
87 ss = KERNEL_DS;
88 if ((regs->eflags & VM_MASK) || (3 & regs->cs) == 3)
89 return;
90 if (regs->cs & 3) {
91 esp = regs->esp;
92 ss = regs->ss;
93 }
94 console_verbose();
95 printk("%s: %04lx\n", str, err & 0xffff);
96 printk("EIP: %04x:%08lx\nEFLAGS: %08lx\n", 0xffff & regs->cs,regs->eip,regs->eflags);
97 printk("eax: %08lx ebx: %08lx ecx: %08lx edx: %08lx\n",
98 regs->eax, regs->ebx, regs->ecx, regs->edx);
99 printk("esi: %08lx edi: %08lx ebp: %08lx esp: %08lx\n",
100 regs->esi, regs->edi, regs->ebp, esp);
101 printk("ds: %04x es: %04x fs: %04x gs: %04x ss: %04x\n",
102 regs->ds, regs->es, regs->fs, regs->gs, ss);
103 store_TR(i);
104 if (STACK_MAGIC != *(unsigned long *)current->kernel_stack_page)
105 printk("Corrupted stack page\n");
106 printk("Process %s (pid: %d, process nr: %d, stackpage=%08lx)\nStack: ",
107 current->comm, current->pid, 0xffff & i, current->kernel_stack_page);
108 for(i=0;i<5;i++)
109 printk("%08lx ", get_seg_long(ss,(i+(unsigned long *)esp)));
110 printk("\nCode: ");
111 for(i=0;i<20;i++)
112 printk("%02x ",0xff & get_seg_byte(regs->cs,(i+(char *)regs->eip)));
113 printk("\n");
114 do_exit(SIGSEGV);
115 }
116
117 DO_ERROR( 0, SIGFPE, "divide error", divide_error, current)
118 DO_ERROR( 3, SIGTRAP, "int3", int3, current)
119 DO_ERROR( 4, SIGSEGV, "overflow", overflow, current)
120 DO_ERROR( 5, SIGSEGV, "bounds", bounds, current)
121 DO_ERROR( 6, SIGILL, "invalid operand", invalid_op, current)
122 DO_ERROR( 7, SIGSEGV, "device not available", device_not_available, current)
123 DO_ERROR( 8, SIGSEGV, "double fault", double_fault, current)
124 DO_ERROR( 9, SIGFPE, "coprocessor segment overrun", coprocessor_segment_overrun, last_task_used_math)
125 DO_ERROR(10, SIGSEGV, "invalid TSS", invalid_TSS, current)
126 DO_ERROR(11, SIGSEGV, "segment not present", segment_not_present, current)
127 DO_ERROR(12, SIGSEGV, "stack segment", stack_segment, current)
128 DO_ERROR(15, SIGSEGV, "reserved", reserved, current)
129 DO_ERROR(17, SIGSEGV, "alignment check", alignment_check, current)
130
131 asmlinkage void do_general_protection(struct pt_regs * regs, long error_code)
132 {
133 if (regs->eflags & VM_MASK) {
134 handle_vm86_fault((struct vm86_regs *) regs, error_code);
135 return;
136 }
137 current->tss.error_code = error_code;
138 current->tss.trap_no = 13;
139 send_sig(SIGSEGV, current, 1);
140 die_if_kernel("general protection",regs,error_code);
141 }
142
143 asmlinkage void do_nmi(struct pt_regs * regs, long error_code)
144 {
145 printk("Uhhuh. NMI received. Dazed and confused, but trying to continue\n");
146 printk("You probably have a hardware problem with your RAM chips\n");
147 }
148
149 asmlinkage void do_debug(struct pt_regs * regs, long error_code)
150 {
151 if (current->flags & PF_PTRACED)
152 current->blocked &= ~(1 << (SIGTRAP-1));
153 send_sig(SIGTRAP, current, 1);
154 current->tss.trap_no = 1;
155 current->tss.error_code = error_code;
156 if((regs->cs & 3) == 0) {
157
158 __asm__("movl $0,%%edx\n\t" \
159 "movl %%edx,%%db7\n\t" \
160 : \
161 : :"dx");
162
163 return;
164 };
165 die_if_kernel("debug",regs,error_code);
166 }
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183 void math_error(void)
184 {
185 struct i387_hard_struct * env;
186
187 clts();
188 if (!last_task_used_math) {
189 __asm__("fnclex");
190 return;
191 }
192 env = &last_task_used_math->tss.i387.hard;
193 send_sig(SIGFPE, last_task_used_math, 1);
194 last_task_used_math->tss.trap_no = 16;
195 last_task_used_math->tss.error_code = 0;
196 __asm__ __volatile__("fnsave %0":"=m" (*env));
197 last_task_used_math = NULL;
198 stts();
199 env->fcs = (env->swd & 0x0000ffff) | (env->fcs & 0xffff0000);
200 env->fos = env->twd;
201 env->swd &= 0xffff3800;
202 env->twd = 0xffffffff;
203 }
204
205 asmlinkage void do_coprocessor_error(struct pt_regs * regs, long error_code)
206 {
207 ignore_irq13 = 1;
208 math_error();
209 }
210
211 void trap_init(void)
212 {
213 int i;
214
215 set_trap_gate(0,÷_error);
216 set_trap_gate(1,&debug);
217 set_trap_gate(2,&nmi);
218 set_system_gate(3,&int3);
219 set_system_gate(4,&overflow);
220 set_system_gate(5,&bounds);
221 set_trap_gate(6,&invalid_op);
222 set_trap_gate(7,&device_not_available);
223 set_trap_gate(8,&double_fault);
224 set_trap_gate(9,&coprocessor_segment_overrun);
225 set_trap_gate(10,&invalid_TSS);
226 set_trap_gate(11,&segment_not_present);
227 set_trap_gate(12,&stack_segment);
228 set_trap_gate(13,&general_protection);
229 set_trap_gate(14,&page_fault);
230 set_trap_gate(15,&reserved);
231 set_trap_gate(16,&coprocessor_error);
232 set_trap_gate(17,&alignment_check);
233 for (i=18;i<48;i++)
234 set_trap_gate(i,&reserved);
235 }