This source file includes following definitions.
- console_verbose
- die_if_kernel
- DO_ERROR
- do_nmi
- do_debug
- math_error
- do_coprocessor_error
- math_state_restore
- math_emulate
- 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 #include <linux/config.h>
20 #include <linux/timer.h>
21
22 #include <asm/system.h>
23 #include <asm/segment.h>
24 #include <asm/io.h>
25
26 asmlinkage int system_call(void);
27 asmlinkage void lcall7(void);
28 struct desc_struct default_ldt;
29
30 static inline void console_verbose(void)
31 {
32 extern int console_loglevel;
33 console_loglevel = 15;
34 }
35
36 #define DO_ERROR(trapnr, signr, str, name, tsk) \
37 asmlinkage void do_##name(struct pt_regs * regs, long error_code) \
38 { \
39 tsk->tss.error_code = error_code; \
40 tsk->tss.trap_no = trapnr; \
41 if (signr == SIGTRAP && current->flags & PF_PTRACED) \
42 current->blocked &= ~(1 << (SIGTRAP-1)); \
43 send_sig(signr, tsk, 1); \
44 die_if_kernel(str,regs,error_code); \
45 }
46
47 #define get_seg_byte(seg,addr) ({ \
48 register unsigned char __res; \
49 __asm__("push %%fs;mov %%ax,%%fs;movb %%fs:%2,%%al;pop %%fs" \
50 :"=a" (__res):"0" (seg),"m" (*(addr))); \
51 __res;})
52
53 #define get_seg_long(seg,addr) ({ \
54 register unsigned long __res; \
55 __asm__("push %%fs;mov %%ax,%%fs;movl %%fs:%2,%%eax;pop %%fs" \
56 :"=a" (__res):"0" (seg),"m" (*(addr))); \
57 __res;})
58
59 #define _fs() ({ \
60 register unsigned short __res; \
61 __asm__("mov %%fs,%%ax":"=a" (__res):); \
62 __res;})
63
64 void page_exception(void);
65
66 asmlinkage void divide_error(void);
67 asmlinkage void debug(void);
68 asmlinkage void nmi(void);
69 asmlinkage void int3(void);
70 asmlinkage void overflow(void);
71 asmlinkage void bounds(void);
72 asmlinkage void invalid_op(void);
73 asmlinkage void device_not_available(void);
74 asmlinkage void double_fault(void);
75 asmlinkage void coprocessor_segment_overrun(void);
76 asmlinkage void invalid_TSS(void);
77 asmlinkage void segment_not_present(void);
78 asmlinkage void stack_segment(void);
79 asmlinkage void general_protection(void);
80 asmlinkage void page_fault(void);
81 asmlinkage void coprocessor_error(void);
82 asmlinkage void reserved(void);
83 asmlinkage void alignment_check(void);
84
85 int kstack_depth_to_print = 24;
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91
92 #define VMALLOC_OFFSET (8*1024*1024)
93 #define MODULE_RANGE (8*1024*1024)
94
95 void die_if_kernel(char * str, struct pt_regs * regs, long err)
96 {
97 int i;
98 unsigned long esp;
99 unsigned short ss;
100 unsigned long *stack, addr, module_start, module_end;
101 extern char start_kernel, etext;
102
103 esp = (unsigned long) ®s->esp;
104 ss = KERNEL_DS;
105 if ((regs->eflags & VM_MASK) || (3 & regs->cs) == 3)
106 return;
107 if (regs->cs & 3) {
108 esp = regs->esp;
109 ss = regs->ss;
110 }
111 console_verbose();
112 printk("%s: %04lx\n", str, err & 0xffff);
113 printk("EIP: %04x:%08lx\nEFLAGS: %08lx\n", 0xffff & regs->cs,regs->eip,regs->eflags);
114 printk("eax: %08lx ebx: %08lx ecx: %08lx edx: %08lx\n",
115 regs->eax, regs->ebx, regs->ecx, regs->edx);
116 printk("esi: %08lx edi: %08lx ebp: %08lx esp: %08lx\n",
117 regs->esi, regs->edi, regs->ebp, esp);
118 printk("ds: %04x es: %04x fs: %04x gs: %04x ss: %04x\n",
119 regs->ds, regs->es, regs->fs, regs->gs, ss);
120 store_TR(i);
121 if (STACK_MAGIC != *(unsigned long *)current->kernel_stack_page)
122 printk("Corrupted stack page\n");
123 printk("Process %s (pid: %d, process nr: %d, stackpage=%08lx)\nStack: ",
124 current->comm, current->pid, 0xffff & i, current->kernel_stack_page);
125 stack = (unsigned long *) esp;
126 for(i=0; i < kstack_depth_to_print; i++) {
127 if (((long) stack & 4095) == 0)
128 break;
129 if (i && ((i % 8) == 0))
130 printk("\n ");
131 printk("%08lx ", get_seg_long(ss,stack++));
132 }
133 printk("\nCall Trace: ");
134 stack = (unsigned long *) esp;
135 i = 1;
136 module_start = ((high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1));
137 module_end = module_start + MODULE_RANGE;
138 while (((long) stack & 4095) != 0) {
139 addr = get_seg_long(ss, stack++);
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148 if (((addr >= (unsigned long) &start_kernel) &&
149 (addr <= (unsigned long) &etext)) ||
150 ((addr >= module_start) && (addr <= module_end))) {
151 if (i && ((i % 8) == 0))
152 printk("\n ");
153 printk("%08lx ", addr);
154 i++;
155 }
156 }
157 printk("\nCode: ");
158 for(i=0;i<20;i++)
159 printk("%02x ",0xff & get_seg_byte(regs->cs,(i+(char *)regs->eip)));
160 printk("\n");
161 do_exit(SIGSEGV);
162 }
163
164 DO_ERROR( 0, SIGFPE, "divide error", divide_error, current)
165 DO_ERROR( 3, SIGTRAP, "int3", int3, current)
166 DO_ERROR( 4, SIGSEGV, "overflow", overflow, current)
167 DO_ERROR( 5, SIGSEGV, "bounds", bounds, current)
168 DO_ERROR( 6, SIGILL, "invalid operand", invalid_op, current)
169 DO_ERROR( 7, SIGSEGV, "device not available", device_not_available, current)
170 DO_ERROR( 8, SIGSEGV, "double fault", double_fault, current)
171 DO_ERROR( 9, SIGFPE, "coprocessor segment overrun", coprocessor_segment_overrun, last_task_used_math)
172 DO_ERROR(10, SIGSEGV, "invalid TSS", invalid_TSS, current)
173 DO_ERROR(11, SIGBUS, "segment not present", segment_not_present, current)
174 DO_ERROR(12, SIGBUS, "stack segment", stack_segment, current)
175 DO_ERROR(15, SIGSEGV, "reserved", reserved, current)
176 DO_ERROR(17, SIGSEGV, "alignment check", alignment_check, current)
177
178 asmlinkage void do_general_protection(struct pt_regs * regs, long error_code)
179 {
180 int signr = SIGSEGV;
181
182 if (regs->eflags & VM_MASK) {
183 handle_vm86_fault((struct vm86_regs *) regs, error_code);
184 return;
185 }
186 die_if_kernel("general protection",regs,error_code);
187 switch (get_seg_byte(regs->cs, (char *)regs->eip)) {
188 case 0xCD:
189 case 0xF4:
190 case 0xFA:
191 case 0xFB:
192 signr = SIGILL;
193 }
194 current->tss.error_code = error_code;
195 current->tss.trap_no = 13;
196 send_sig(signr, current, 1);
197 }
198
199 asmlinkage void do_nmi(struct pt_regs * regs, long error_code)
200 {
201 printk("Uhhuh. NMI received. Dazed and confused, but trying to continue\n");
202 printk("You probably have a hardware problem with your RAM chips\n");
203 }
204
205 asmlinkage void do_debug(struct pt_regs * regs, long error_code)
206 {
207 if (regs->eflags & VM_MASK) {
208 handle_vm86_debug((struct vm86_regs *) regs, error_code);
209 return;
210 }
211 if (current->flags & PF_PTRACED)
212 current->blocked &= ~(1 << (SIGTRAP-1));
213 send_sig(SIGTRAP, current, 1);
214 current->tss.trap_no = 1;
215 current->tss.error_code = error_code;
216 if ((regs->cs & 3) == 0) {
217
218 __asm__("movl %0,%%db7"
219 :
220 : "r" (0));
221 return;
222 }
223 die_if_kernel("debug",regs,error_code);
224 }
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241 void math_error(void)
242 {
243 struct i387_hard_struct * env;
244
245 clts();
246 if (!last_task_used_math) {
247 __asm__("fnclex");
248 return;
249 }
250 env = &last_task_used_math->tss.i387.hard;
251 send_sig(SIGFPE, last_task_used_math, 1);
252 last_task_used_math->tss.trap_no = 16;
253 last_task_used_math->tss.error_code = 0;
254 __asm__ __volatile__("fnsave %0":"=m" (*env));
255 last_task_used_math = NULL;
256 stts();
257 env->fcs = (env->swd & 0x0000ffff) | (env->fcs & 0xffff0000);
258 env->fos = env->twd;
259 env->swd &= 0xffff3800;
260 env->twd = 0xffffffff;
261 }
262
263 asmlinkage void do_coprocessor_error(struct pt_regs * regs, long error_code)
264 {
265 ignore_irq13 = 1;
266 math_error();
267 }
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276 asmlinkage void math_state_restore(void)
277 {
278 __asm__ __volatile__("clts");
279 if (last_task_used_math == current)
280 return;
281 timer_table[COPRO_TIMER].expires = jiffies+50;
282 timer_active |= 1<<COPRO_TIMER;
283 if (last_task_used_math)
284 __asm__("fnsave %0":"=m" (last_task_used_math->tss.i387));
285 else
286 __asm__("fnclex");
287 last_task_used_math = current;
288 if (current->used_math) {
289 __asm__("frstor %0": :"m" (current->tss.i387));
290 } else {
291 __asm__("fninit");
292 current->used_math=1;
293 }
294 timer_active &= ~(1<<COPRO_TIMER);
295 }
296
297 #ifndef CONFIG_MATH_EMULATION
298
299 asmlinkage void math_emulate(long arg)
300 {
301 printk("math-emulation not enabled and no coprocessor found.\n");
302 printk("killing %s.\n",current->comm);
303 send_sig(SIGFPE,current,1);
304 schedule();
305 }
306
307 #endif
308
309 void trap_init(void)
310 {
311 int i;
312 struct desc_struct * p;
313
314 set_call_gate(&default_ldt,lcall7);
315 set_trap_gate(0,÷_error);
316 set_trap_gate(1,&debug);
317 set_trap_gate(2,&nmi);
318 set_system_gate(3,&int3);
319 set_system_gate(4,&overflow);
320 set_system_gate(5,&bounds);
321 set_trap_gate(6,&invalid_op);
322 set_trap_gate(7,&device_not_available);
323 set_trap_gate(8,&double_fault);
324 set_trap_gate(9,&coprocessor_segment_overrun);
325 set_trap_gate(10,&invalid_TSS);
326 set_trap_gate(11,&segment_not_present);
327 set_trap_gate(12,&stack_segment);
328 set_trap_gate(13,&general_protection);
329 set_trap_gate(14,&page_fault);
330 set_trap_gate(15,&reserved);
331 set_trap_gate(16,&coprocessor_error);
332 set_trap_gate(17,&alignment_check);
333 for (i=18;i<48;i++)
334 set_trap_gate(i,&reserved);
335 set_system_gate(0x80,&system_call);
336
337 p = gdt+FIRST_TSS_ENTRY;
338 set_tss_desc(p, &init_task.tss);
339 p++;
340 set_ldt_desc(p, &default_ldt, 1);
341 p++;
342 for(i=1 ; i<NR_TASKS ; i++) {
343 p->a=p->b=0;
344 p++;
345 p->a=p->b=0;
346 p++;
347 }
348
349 __asm__("pushfl ; andl $0xffffbfff,(%esp) ; popfl");
350 load_TR(0);
351 load_ldt(0);
352 }