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1/*
2 * arch/score/kernel/traps.c
3 *
4 * Score Processor version.
5 *
6 * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
7 * Chen Liqin <liqin.chen@sunplusct.com>
8 * Lennox Wu <lennox.wu@sunplusct.com>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, see the file COPYING, or write
22 * to the Free Software Foundation, Inc.,
23 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
24 */
25
26#include <linux/module.h>
27#include <linux/sched.h>
28
29#include <asm/cacheflush.h>
30#include <asm/irq.h>
31#include <asm/irq_regs.h>
32
33unsigned long exception_handlers[32];
34
35/*
36 * The architecture-independent show_stack generator
37 */
38void show_stack(struct task_struct *task, unsigned long *sp)
39{
40 int i;
41 long stackdata;
42
43 sp = sp ? sp : (unsigned long *)&sp;
44
45 printk(KERN_NOTICE "Stack: ");
46 i = 1;
47 while ((long) sp & (PAGE_SIZE - 1)) {
48 if (i && ((i % 8) == 0))
49 printk(KERN_NOTICE "\n");
50 if (i > 40) {
51 printk(KERN_NOTICE " ...");
52 break;
53 }
54
55 if (__get_user(stackdata, sp++)) {
56 printk(KERN_NOTICE " (Bad stack address)");
57 break;
58 }
59
60 printk(KERN_NOTICE " %08lx", stackdata);
61 i++;
62 }
63 printk(KERN_NOTICE "\n");
64}
65
66static void show_trace(long *sp)
67{
68 int i;
69 long addr;
70
71 sp = sp ? sp : (long *) &sp;
72
73 printk(KERN_NOTICE "Call Trace: ");
74 i = 1;
75 while ((long) sp & (PAGE_SIZE - 1)) {
76 if (__get_user(addr, sp++)) {
77 if (i && ((i % 6) == 0))
78 printk(KERN_NOTICE "\n");
79 printk(KERN_NOTICE " (Bad stack address)\n");
80 break;
81 }
82
83 if (kernel_text_address(addr)) {
84 if (i && ((i % 6) == 0))
85 printk(KERN_NOTICE "\n");
86 if (i > 40) {
87 printk(KERN_NOTICE " ...");
88 break;
89 }
90
91 printk(KERN_NOTICE " [<%08lx>]", addr);
92 i++;
93 }
94 }
95 printk(KERN_NOTICE "\n");
96}
97
98static void show_code(unsigned int *pc)
99{
100 long i;
101
102 printk(KERN_NOTICE "\nCode:");
103
104 for (i = -3; i < 6; i++) {
105 unsigned long insn;
106 if (__get_user(insn, pc + i)) {
107 printk(KERN_NOTICE " (Bad address in epc)\n");
108 break;
109 }
110 printk(KERN_NOTICE "%c%08lx%c", (i ? ' ' : '<'),
111 insn, (i ? ' ' : '>'));
112 }
113}
114
115/*
116 * FIXME: really the generic show_regs should take a const pointer argument.
117 */
118void show_regs(struct pt_regs *regs)
119{
120 printk("r0 : %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
121 regs->regs[0], regs->regs[1], regs->regs[2], regs->regs[3],
122 regs->regs[4], regs->regs[5], regs->regs[6], regs->regs[7]);
123 printk("r8 : %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
124 regs->regs[8], regs->regs[9], regs->regs[10], regs->regs[11],
125 regs->regs[12], regs->regs[13], regs->regs[14], regs->regs[15]);
126 printk("r16: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
127 regs->regs[16], regs->regs[17], regs->regs[18], regs->regs[19],
128 regs->regs[20], regs->regs[21], regs->regs[22], regs->regs[23]);
129 printk("r24: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
130 regs->regs[24], regs->regs[25], regs->regs[26], regs->regs[27],
131 regs->regs[28], regs->regs[29], regs->regs[30], regs->regs[31]);
132
133 printk("CEH : %08lx\n", regs->ceh);
134 printk("CEL : %08lx\n", regs->cel);
135
136 printk("EMA:%08lx, epc:%08lx %s\nPSR: %08lx\nECR:%08lx\nCondition : %08lx\n",
137 regs->cp0_ema, regs->cp0_epc, print_tainted(), regs->cp0_psr,
138 regs->cp0_ecr, regs->cp0_condition);
139}
140
141static void show_registers(struct pt_regs *regs)
142{
143 show_regs(regs);
144 printk(KERN_NOTICE "Process %s (pid: %d, stackpage=%08lx)\n",
145 current->comm, current->pid, (unsigned long) current);
146 show_stack(current_thread_info()->task, (long *) regs->regs[0]);
147 show_trace((long *) regs->regs[0]);
148 show_code((unsigned int *) regs->cp0_epc);
149 printk(KERN_NOTICE "\n");
150}
151
152/*
153 * The architecture-independent dump_stack generator
154 */
155void dump_stack(void)
156{
157 show_stack(current_thread_info()->task,
158 (long *) get_irq_regs()->regs[0]);
159}
160EXPORT_SYMBOL(dump_stack);
161
162void __die(const char *str, struct pt_regs *regs, const char *file,
163 const char *func, unsigned long line)
164{
165 console_verbose();
166 printk("%s", str);
167 if (file && func)
168 printk(" in %s:%s, line %ld", file, func, line);
169 printk(":\n");
170 show_registers(regs);
171 do_exit(SIGSEGV);
172}
173
174void __die_if_kernel(const char *str, struct pt_regs *regs,
175 const char *file, const char *func, unsigned long line)
176{
177 if (!user_mode(regs))
178 __die(str, regs, file, func, line);
179}
180
181asmlinkage void do_adelinsn(struct pt_regs *regs)
182{
183 printk("do_ADE-linsn:ema:0x%08lx:epc:0x%08lx\n",
184 regs->cp0_ema, regs->cp0_epc);
185 die_if_kernel("do_ade execution Exception\n", regs);
186 force_sig(SIGBUS, current);
187}
188
189asmlinkage void do_adedata(struct pt_regs *regs)
190{
191 const struct exception_table_entry *fixup;
192 fixup = search_exception_tables(regs->cp0_epc);
193 if (fixup) {
194 regs->cp0_epc = fixup->fixup;
195 return;
196 }
197 printk("do_ADE-data:ema:0x%08lx:epc:0x%08lx\n",
198 regs->cp0_ema, regs->cp0_epc);
199 die_if_kernel("do_ade execution Exception\n", regs);
200 force_sig(SIGBUS, current);
201}
202
203asmlinkage void do_pel(struct pt_regs *regs)
204{
205 die_if_kernel("do_pel execution Exception", regs);
206 force_sig(SIGFPE, current);
207}
208
209asmlinkage void do_cee(struct pt_regs *regs)
210{
211 die_if_kernel("do_cee execution Exception", regs);
212 force_sig(SIGFPE, current);
213}
214
215asmlinkage void do_cpe(struct pt_regs *regs)
216{
217 die_if_kernel("do_cpe execution Exception", regs);
218 force_sig(SIGFPE, current);
219}
220
221asmlinkage void do_be(struct pt_regs *regs)
222{
223 die_if_kernel("do_be execution Exception", regs);
224 force_sig(SIGBUS, current);
225}
226
227asmlinkage void do_ov(struct pt_regs *regs)
228{
229 siginfo_t info;
230
231 die_if_kernel("do_ov execution Exception", regs);
232
233 info.si_code = FPE_INTOVF;
234 info.si_signo = SIGFPE;
235 info.si_errno = 0;
236 info.si_addr = (void *)regs->cp0_epc;
237 force_sig_info(SIGFPE, &info, current);
238}
239
240asmlinkage void do_tr(struct pt_regs *regs)
241{
242 die_if_kernel("do_tr execution Exception", regs);
243 force_sig(SIGTRAP, current);
244}
245
246asmlinkage void do_ri(struct pt_regs *regs)
247{
248 unsigned long epc_insn;
249 unsigned long epc = regs->cp0_epc;
250
251 read_tsk_long(current, epc, &epc_insn);
252 if (current->thread.single_step == 1) {
253 if ((epc == current->thread.addr1) ||
254 (epc == current->thread.addr2)) {
255 user_disable_single_step(current);
256 force_sig(SIGTRAP, current);
257 return;
258 } else
259 BUG();
260 } else if ((epc_insn == BREAKPOINT32_INSN) ||
261 ((epc_insn & 0x0000FFFF) == 0x7002) ||
262 ((epc_insn & 0xFFFF0000) == 0x70020000)) {
263 force_sig(SIGTRAP, current);
264 return;
265 } else {
266 die_if_kernel("do_ri execution Exception", regs);
267 force_sig(SIGILL, current);
268 }
269}
270
271asmlinkage void do_ccu(struct pt_regs *regs)
272{
273 die_if_kernel("do_ccu execution Exception", regs);
274 force_sig(SIGILL, current);
275}
276
277asmlinkage void do_reserved(struct pt_regs *regs)
278{
279 /*
280 * Game over - no way to handle this if it ever occurs. Most probably
281 * caused by a new unknown cpu type or after another deadly
282 * hard/software error.
283 */
284 die_if_kernel("do_reserved execution Exception", regs);
285 show_regs(regs);
286 panic("Caught reserved exception - should not happen.");
287}
288
289/*
290 * NMI exception handler.
291 */
292void nmi_exception_handler(struct pt_regs *regs)
293{
294 die_if_kernel("nmi_exception_handler execution Exception", regs);
295 die("NMI", regs);
296}
297
298/* Install CPU exception handler */
299void *set_except_vector(int n, void *addr)
300{
301 unsigned long handler = (unsigned long) addr;
302 unsigned long old_handler = exception_handlers[n];
303
304 exception_handlers[n] = handler;
305 return (void *)old_handler;
306}
307
308void __init trap_init(void)
309{
310 int i;
311
312 pgd_current = (unsigned long)init_mm.pgd;
313 /* DEBUG EXCEPTION */
314 memcpy((void *)DEBUG_VECTOR_BASE_ADDR,
315 &debug_exception_vector, DEBUG_VECTOR_SIZE);
316 /* NMI EXCEPTION */
317 memcpy((void *)GENERAL_VECTOR_BASE_ADDR,
318 &general_exception_vector, GENERAL_VECTOR_SIZE);
319
320 /*
321 * Initialise exception handlers
322 */
323 for (i = 0; i <= 31; i++)
324 set_except_vector(i, handle_reserved);
325
326 set_except_vector(1, handle_nmi);
327 set_except_vector(2, handle_adelinsn);
328 set_except_vector(3, handle_tlb_refill);
329 set_except_vector(4, handle_tlb_invaild);
330 set_except_vector(5, handle_ibe);
331 set_except_vector(6, handle_pel);
332 set_except_vector(7, handle_sys);
333 set_except_vector(8, handle_ccu);
334 set_except_vector(9, handle_ri);
335 set_except_vector(10, handle_tr);
336 set_except_vector(11, handle_adedata);
337 set_except_vector(12, handle_adedata);
338 set_except_vector(13, handle_tlb_refill);
339 set_except_vector(14, handle_tlb_invaild);
340 set_except_vector(15, handle_mod);
341 set_except_vector(16, handle_cee);
342 set_except_vector(17, handle_cpe);
343 set_except_vector(18, handle_dbe);
344 flush_icache_range(DEBUG_VECTOR_BASE_ADDR, IRQ_VECTOR_BASE_ADDR);
345
346 atomic_inc(&init_mm.mm_count);
347 current->active_mm = &init_mm;
348 cpu_cache_init();
349}