1
2
3
4#include <linux/module.h>
5#include <linux/personality.h>
6#include <linux/kallsyms.h>
7#include <linux/hardirq.h>
8#include <linux/kdebug.h>
9#include <linux/sched/task_stack.h>
10#include <linux/uaccess.h>
11#include <linux/ftrace.h>
12
13#include <asm/proc-fns.h>
14#include <asm/unistd.h>
15#include <asm/fpu.h>
16
17#include <linux/ptrace.h>
18#include <nds32_intrinsic.h>
19
20extern void show_pte(struct mm_struct *mm, unsigned long addr);
21
22
23
24
25void dump_mem(const char *lvl, unsigned long bottom, unsigned long top)
26{
27 unsigned long first;
28 mm_segment_t fs;
29 int i;
30
31
32
33
34
35
36 fs = get_fs();
37 set_fs(KERNEL_DS);
38
39 pr_emerg("%s(0x%08lx to 0x%08lx)\n", lvl, bottom, top);
40
41 for (first = bottom & ~31; first < top; first += 32) {
42 unsigned long p;
43 char str[sizeof(" 12345678") * 8 + 1];
44
45 memset(str, ' ', sizeof(str));
46 str[sizeof(str) - 1] = '\0';
47
48 for (p = first, i = 0; i < 8 && p < top; i++, p += 4) {
49 if (p >= bottom && p < top) {
50 unsigned long val;
51 if (__get_user(val, (unsigned long *)p) == 0)
52 sprintf(str + i * 9, " %08lx", val);
53 else
54 sprintf(str + i * 9, " ????????");
55 }
56 }
57 pr_emerg("%s%04lx:%s\n", lvl, first & 0xffff, str);
58 }
59
60 set_fs(fs);
61}
62
63EXPORT_SYMBOL(dump_mem);
64
65static void dump_instr(struct pt_regs *regs)
66{
67 unsigned long addr = instruction_pointer(regs);
68 mm_segment_t fs;
69 char str[sizeof("00000000 ") * 5 + 2 + 1], *p = str;
70 int i;
71
72 return;
73
74
75
76
77
78 fs = get_fs();
79 set_fs(KERNEL_DS);
80
81 pr_emerg("Code: ");
82 for (i = -4; i < 1; i++) {
83 unsigned int val, bad;
84
85 bad = __get_user(val, &((u32 *) addr)[i]);
86
87 if (!bad) {
88 p += sprintf(p, i == 0 ? "(%08x) " : "%08x ", val);
89 } else {
90 p += sprintf(p, "bad PC value");
91 break;
92 }
93 }
94 pr_emerg("Code: %s\n", str);
95
96 set_fs(fs);
97}
98
99#define LOOP_TIMES (100)
100static void __dump(struct task_struct *tsk, unsigned long *base_reg)
101{
102 unsigned long ret_addr;
103 int cnt = LOOP_TIMES, graph = 0;
104 pr_emerg("Call Trace:\n");
105 if (!IS_ENABLED(CONFIG_FRAME_POINTER)) {
106 while (!kstack_end(base_reg)) {
107 ret_addr = *base_reg++;
108 if (__kernel_text_address(ret_addr)) {
109 ret_addr = ftrace_graph_ret_addr(
110 tsk, &graph, ret_addr, NULL);
111 print_ip_sym(ret_addr);
112 }
113 if (--cnt < 0)
114 break;
115 }
116 } else {
117 while (!kstack_end((void *)base_reg) &&
118 !((unsigned long)base_reg & 0x3) &&
119 ((unsigned long)base_reg >= TASK_SIZE)) {
120 unsigned long next_fp;
121 ret_addr = base_reg[LP_OFFSET];
122 next_fp = base_reg[FP_OFFSET];
123 if (__kernel_text_address(ret_addr)) {
124
125 ret_addr = ftrace_graph_ret_addr(
126 tsk, &graph, ret_addr, NULL);
127 print_ip_sym(ret_addr);
128 }
129 if (--cnt < 0)
130 break;
131 base_reg = (unsigned long *)next_fp;
132 }
133 }
134 pr_emerg("\n");
135}
136
137void show_stack(struct task_struct *tsk, unsigned long *sp)
138{
139 unsigned long *base_reg;
140
141 if (!tsk)
142 tsk = current;
143 if (!IS_ENABLED(CONFIG_FRAME_POINTER)) {
144 if (tsk != current)
145 base_reg = (unsigned long *)(tsk->thread.cpu_context.sp);
146 else
147 __asm__ __volatile__("\tori\t%0, $sp, #0\n":"=r"(base_reg));
148 } else {
149 if (tsk != current)
150 base_reg = (unsigned long *)(tsk->thread.cpu_context.fp);
151 else
152 __asm__ __volatile__("\tori\t%0, $fp, #0\n":"=r"(base_reg));
153 }
154 __dump(tsk, base_reg);
155 barrier();
156}
157
158DEFINE_SPINLOCK(die_lock);
159
160
161
162
163void die(const char *str, struct pt_regs *regs, int err)
164{
165 struct task_struct *tsk = current;
166 static int die_counter;
167
168 console_verbose();
169 spin_lock_irq(&die_lock);
170 bust_spinlocks(1);
171
172 pr_emerg("Internal error: %s: %x [#%d]\n", str, err, ++die_counter);
173 print_modules();
174 pr_emerg("CPU: %i\n", smp_processor_id());
175 show_regs(regs);
176 pr_emerg("Process %s (pid: %d, stack limit = 0x%p)\n",
177 tsk->comm, tsk->pid, end_of_stack(tsk));
178
179 if (!user_mode(regs) || in_interrupt()) {
180 dump_mem("Stack: ", regs->sp, (regs->sp + PAGE_SIZE) & PAGE_MASK);
181 dump_instr(regs);
182 dump_stack();
183 }
184
185 bust_spinlocks(0);
186 spin_unlock_irq(&die_lock);
187 do_exit(SIGSEGV);
188}
189
190EXPORT_SYMBOL(die);
191
192void die_if_kernel(const char *str, struct pt_regs *regs, int err)
193{
194 if (user_mode(regs))
195 return;
196
197 die(str, regs, err);
198}
199
200int bad_syscall(int n, struct pt_regs *regs)
201{
202 if (current->personality != PER_LINUX) {
203 send_sig(SIGSEGV, current, 1);
204 return regs->uregs[0];
205 }
206
207 force_sig_fault(SIGILL, ILL_ILLTRP,
208 (void __user *)instruction_pointer(regs) - 4);
209 die_if_kernel("Oops - bad syscall", regs, n);
210 return regs->uregs[0];
211}
212
213void __pte_error(const char *file, int line, unsigned long val)
214{
215 pr_emerg("%s:%d: bad pte %08lx.\n", file, line, val);
216}
217
218void __pmd_error(const char *file, int line, unsigned long val)
219{
220 pr_emerg("%s:%d: bad pmd %08lx.\n", file, line, val);
221}
222
223void __pgd_error(const char *file, int line, unsigned long val)
224{
225 pr_emerg("%s:%d: bad pgd %08lx.\n", file, line, val);
226}
227
228extern char *exception_vector, *exception_vector_end;
229void __init trap_init(void)
230{
231 return;
232}
233
234void __init early_trap_init(void)
235{
236 unsigned long ivb = 0;
237 unsigned long base = PAGE_OFFSET;
238
239 memcpy((unsigned long *)base, (unsigned long *)&exception_vector,
240 ((unsigned long)&exception_vector_end -
241 (unsigned long)&exception_vector));
242 ivb = __nds32__mfsr(NDS32_SR_IVB);
243
244 if (((ivb & IVB_mskNIVIC) >> IVB_offNIVIC) < 2)
245 panic
246 ("IVIC mode is not allowed on the platform with interrupt controller\n");
247 __nds32__mtsr((ivb & ~IVB_mskESZ) | (IVB_valESZ16 << IVB_offESZ) |
248 IVB_BASE, NDS32_SR_IVB);
249 __nds32__mtsr(INT_MASK_INITAIAL_VAL, NDS32_SR_INT_MASK);
250
251
252
253
254
255 cpu_cache_wbinval_page(base, true);
256}
257
258static void send_sigtrap(struct pt_regs *regs, int error_code, int si_code)
259{
260 struct task_struct *tsk = current;
261
262 tsk->thread.trap_no = ENTRY_DEBUG_RELATED;
263 tsk->thread.error_code = error_code;
264
265 force_sig_fault(SIGTRAP, si_code,
266 (void __user *)instruction_pointer(regs));
267}
268
269void do_debug_trap(unsigned long entry, unsigned long addr,
270 unsigned long type, struct pt_regs *regs)
271{
272 if (notify_die(DIE_OOPS, "Oops", regs, addr, type, SIGTRAP)
273 == NOTIFY_STOP)
274 return;
275
276 if (user_mode(regs)) {
277
278 send_sigtrap(regs, 0, TRAP_BRKPT);
279 } else {
280
281 if (!fixup_exception(regs))
282 die("unexpected kernel_trap", regs, 0);
283 }
284}
285
286void unhandled_interruption(struct pt_regs *regs)
287{
288 pr_emerg("unhandled_interruption\n");
289 show_regs(regs);
290 if (!user_mode(regs))
291 do_exit(SIGKILL);
292 force_sig(SIGKILL);
293}
294
295void unhandled_exceptions(unsigned long entry, unsigned long addr,
296 unsigned long type, struct pt_regs *regs)
297{
298 pr_emerg("Unhandled Exception: entry: %lx addr:%lx itype:%lx\n", entry,
299 addr, type);
300 show_regs(regs);
301 if (!user_mode(regs))
302 do_exit(SIGKILL);
303 force_sig(SIGKILL);
304}
305
306extern int do_page_fault(unsigned long entry, unsigned long addr,
307 unsigned int error_code, struct pt_regs *regs);
308
309
310
311
312
313void do_dispatch_tlb_misc(unsigned long entry, unsigned long addr,
314 unsigned long type, struct pt_regs *regs)
315{
316 type = type & (ITYPE_mskINST | ITYPE_mskETYPE);
317 if ((type & ITYPE_mskETYPE) < 5) {
318
319 do_page_fault(entry, addr, type, regs);
320 } else
321 unhandled_exceptions(entry, addr, type, regs);
322}
323
324void do_revinsn(struct pt_regs *regs)
325{
326 pr_emerg("Reserved Instruction\n");
327 show_regs(regs);
328 if (!user_mode(regs))
329 do_exit(SIGILL);
330 force_sig(SIGILL);
331}
332
333#ifdef CONFIG_ALIGNMENT_TRAP
334extern int unalign_access_mode;
335extern int do_unaligned_access(unsigned long addr, struct pt_regs *regs);
336#endif
337void do_dispatch_general(unsigned long entry, unsigned long addr,
338 unsigned long itype, struct pt_regs *regs,
339 unsigned long oipc)
340{
341 unsigned int swid = itype >> ITYPE_offSWID;
342 unsigned long type = itype & (ITYPE_mskINST | ITYPE_mskETYPE);
343 if (type == ETYPE_ALIGNMENT_CHECK) {
344#ifdef CONFIG_ALIGNMENT_TRAP
345
346 if (user_mode(regs) && unalign_access_mode) {
347 int ret;
348 ret = do_unaligned_access(addr, regs);
349
350 if (ret == 0)
351 return;
352
353 if (ret == -EFAULT)
354 pr_emerg
355 ("Unhandled unaligned access exception\n");
356 }
357#endif
358 do_page_fault(entry, addr, type, regs);
359 } else if (type == ETYPE_RESERVED_INSTRUCTION) {
360
361 do_revinsn(regs);
362 } else if (type == ETYPE_COPROCESSOR) {
363
364#if IS_ENABLED(CONFIG_FPU)
365 unsigned int fucop_exist = __nds32__mfsr(NDS32_SR_FUCOP_EXIST);
366 unsigned int cpid = ((itype & ITYPE_mskCPID) >> ITYPE_offCPID);
367
368 if ((cpid == FPU_CPID) &&
369 (fucop_exist & FUCOP_EXIST_mskCP0ISFPU)) {
370 unsigned int subtype = (itype & ITYPE_mskSTYPE);
371
372 if (true == do_fpu_exception(subtype, regs))
373 return;
374 }
375#endif
376 unhandled_exceptions(entry, addr, type, regs);
377 } else if (type == ETYPE_TRAP && swid == SWID_RAISE_INTERRUPT_LEVEL) {
378
379
380
381
382
383
384
385
386
387
388
389 __asm__ volatile ("mtsr %0, $IPC\n\t"::"r" (oipc));
390 regs->ipc = oipc;
391 if (regs->pipsw & PSW_mskDEX) {
392 pr_emerg
393 ("Nested Debug exception is possibly happened\n");
394 pr_emerg("ipc:%08x pipc:%08x\n",
395 (unsigned int)regs->ipc,
396 (unsigned int)regs->pipc);
397 }
398 do_debug_trap(entry, addr, itype, regs);
399 regs->ipsw &= ~PSW_mskDEX;
400 } else
401 unhandled_exceptions(entry, addr, type, regs);
402}
403
