1
2
3
4
5
6
7
8
9
10
11
12
13#include <linux/init.h>
14#include <linux/kernel.h>
15#include <linux/kallsyms.h>
16#include <linux/stddef.h>
17#include <linux/ptrace.h>
18#include <linux/sched/debug.h>
19#include <linux/sched/task_stack.h>
20#include <linux/mm.h>
21#include <linux/cpu.h>
22
23#include <asm/page.h>
24#include <asm/processor.h>
25
26#include <linux/uaccess.h>
27#include <asm/io.h>
28#include <linux/atomic.h>
29
30#include <asm/smp.h>
31
32#include <linux/module.h>
33
34asmlinkage void alignment_check(void);
35asmlinkage void ei_handler(void);
36asmlinkage void rie_handler(void);
37asmlinkage void debug_trap(void);
38asmlinkage void cache_flushing_handler(void);
39asmlinkage void ill_trap(void);
40
41#ifdef CONFIG_SMP
42extern void smp_reschedule_interrupt(void);
43extern void smp_invalidate_interrupt(void);
44extern void smp_call_function_interrupt(void);
45extern void smp_ipi_timer_interrupt(void);
46extern void smp_flush_cache_all_interrupt(void);
47extern void smp_call_function_single_interrupt(void);
48
49
50
51
52asm (
53 " .section .eit_vector4,\"ax\" \n"
54 " .global _AP_RE \n"
55 " .global startup_AP \n"
56 "_AP_RE: \n"
57 " .fill 32, 4, 0 \n"
58 "_AP_EI: bra startup_AP \n"
59 " .previous \n"
60);
61#endif
62
63extern unsigned long eit_vector[];
64#define BRA_INSN(func, entry) \
65 ((unsigned long)func - (unsigned long)eit_vector - entry*4)/4 \
66 + 0xff000000UL
67
68static void set_eit_vector_entries(void)
69{
70 extern void default_eit_handler(void);
71 extern void system_call(void);
72 extern void pie_handler(void);
73 extern void ace_handler(void);
74 extern void tme_handler(void);
75 extern void _flush_cache_copyback_all(void);
76
77 eit_vector[0] = 0xd0c00001;
78 eit_vector[1] = BRA_INSN(default_eit_handler, 1);
79 eit_vector[4] = 0xd0c00010;
80 eit_vector[5] = BRA_INSN(default_eit_handler, 5);
81 eit_vector[8] = BRA_INSN(rie_handler, 8);
82 eit_vector[12] = BRA_INSN(alignment_check, 12);
83 eit_vector[16] = BRA_INSN(ill_trap, 16);
84 eit_vector[17] = BRA_INSN(debug_trap, 17);
85 eit_vector[18] = BRA_INSN(system_call, 18);
86 eit_vector[19] = BRA_INSN(ill_trap, 19);
87 eit_vector[20] = BRA_INSN(ill_trap, 20);
88 eit_vector[21] = BRA_INSN(ill_trap, 21);
89 eit_vector[22] = BRA_INSN(ill_trap, 22);
90 eit_vector[23] = BRA_INSN(ill_trap, 23);
91 eit_vector[24] = BRA_INSN(ill_trap, 24);
92 eit_vector[25] = BRA_INSN(ill_trap, 25);
93 eit_vector[26] = BRA_INSN(ill_trap, 26);
94 eit_vector[27] = BRA_INSN(ill_trap, 27);
95 eit_vector[28] = BRA_INSN(cache_flushing_handler, 28);
96 eit_vector[29] = BRA_INSN(ill_trap, 29);
97 eit_vector[30] = BRA_INSN(ill_trap, 30);
98 eit_vector[31] = BRA_INSN(ill_trap, 31);
99 eit_vector[32] = BRA_INSN(ei_handler, 32);
100 eit_vector[64] = BRA_INSN(pie_handler, 64);
101#ifdef CONFIG_MMU
102 eit_vector[68] = BRA_INSN(ace_handler, 68);
103 eit_vector[72] = BRA_INSN(tme_handler, 72);
104#endif
105#ifdef CONFIG_SMP
106 eit_vector[184] = (unsigned long)smp_reschedule_interrupt;
107 eit_vector[185] = (unsigned long)smp_invalidate_interrupt;
108 eit_vector[186] = (unsigned long)smp_call_function_interrupt;
109 eit_vector[187] = (unsigned long)smp_ipi_timer_interrupt;
110 eit_vector[188] = (unsigned long)smp_flush_cache_all_interrupt;
111 eit_vector[189] = 0;
112 eit_vector[190] = (unsigned long)smp_call_function_single_interrupt;
113 eit_vector[191] = 0;
114#endif
115 _flush_cache_copyback_all();
116}
117
118void abort(void)
119{
120 BUG();
121
122
123 panic("Oops failed to kill thread");
124}
125
126void __init trap_init(void)
127{
128 set_eit_vector_entries();
129
130
131
132
133 cpu_init();
134}
135
136static int kstack_depth_to_print = 24;
137
138static void show_trace(struct task_struct *task, unsigned long *stack)
139{
140 unsigned long addr;
141
142 if (!stack)
143 stack = (unsigned long*)&stack;
144
145 printk("Call Trace: ");
146 while (!kstack_end(stack)) {
147 addr = *stack++;
148 if (__kernel_text_address(addr))
149 printk("[<%08lx>] %pSR\n", addr, (void *)addr);
150 }
151 printk("\n");
152}
153
154void show_stack(struct task_struct *task, unsigned long *sp)
155{
156 unsigned long *stack;
157 int i;
158
159
160
161
162
163
164 if(sp==NULL) {
165 if (task)
166 sp = (unsigned long *)task->thread.sp;
167 else
168 sp=(unsigned long*)&sp;
169 }
170
171 stack = sp;
172 for(i=0; i < kstack_depth_to_print; i++) {
173 if (kstack_end(stack))
174 break;
175 if (i && ((i % 4) == 0))
176 printk("\n ");
177 printk("%08lx ", *stack++);
178 }
179 printk("\n");
180 show_trace(task, sp);
181}
182
183static void show_registers(struct pt_regs *regs)
184{
185 int i = 0;
186 int in_kernel = 1;
187 unsigned long sp;
188
189 printk("CPU: %d\n", smp_processor_id());
190 show_regs(regs);
191
192 sp = (unsigned long) (1+regs);
193 if (user_mode(regs)) {
194 in_kernel = 0;
195 sp = regs->spu;
196 printk("SPU: %08lx\n", sp);
197 } else {
198 printk("SPI: %08lx\n", sp);
199 }
200 printk("Process %s (pid: %d, process nr: %d, stackpage=%08lx)",
201 current->comm, task_pid_nr(current), 0xffff & i, 4096+(unsigned long)current);
202
203
204
205
206
207 if (in_kernel) {
208 printk("\nStack: ");
209 show_stack(current, (unsigned long*) sp);
210
211 printk("\nCode: ");
212 if (regs->bpc < PAGE_OFFSET)
213 goto bad;
214
215 for(i=0;i<20;i++) {
216 unsigned char c;
217 if (__get_user(c, &((unsigned char*)regs->bpc)[i])) {
218bad:
219 printk(" Bad PC value.");
220 break;
221 }
222 printk("%02x ", c);
223 }
224 }
225 printk("\n");
226}
227
228static DEFINE_SPINLOCK(die_lock);
229
230void die(const char * str, struct pt_regs * regs, long err)
231{
232 console_verbose();
233 spin_lock_irq(&die_lock);
234 bust_spinlocks(1);
235 printk("%s: %04lx\n", str, err & 0xffff);
236 show_registers(regs);
237 bust_spinlocks(0);
238 spin_unlock_irq(&die_lock);
239 do_exit(SIGSEGV);
240}
241
242static __inline__ void die_if_kernel(const char * str,
243 struct pt_regs * regs, long err)
244{
245 if (!user_mode(regs))
246 die(str, regs, err);
247}
248
249static __inline__ void do_trap(int trapnr, int signr, const char * str,
250 struct pt_regs * regs, long error_code, siginfo_t *info)
251{
252 if (user_mode(regs)) {
253
254 struct task_struct *tsk = current;
255 tsk->thread.error_code = error_code;
256 tsk->thread.trap_no = trapnr;
257 if (info)
258 force_sig_info(signr, info, tsk);
259 else
260 force_sig(signr, tsk);
261 return;
262 } else {
263
264 if (!fixup_exception(regs))
265 die(str, regs, error_code);
266 return;
267 }
268}
269
270#define DO_ERROR(trapnr, signr, str, name) \
271asmlinkage void do_##name(struct pt_regs * regs, long error_code) \
272{ \
273 do_trap(trapnr, signr, NULL, regs, error_code, NULL); \
274}
275
276#define DO_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr) \
277asmlinkage void do_##name(struct pt_regs * regs, long error_code) \
278{ \
279 siginfo_t info; \
280 info.si_signo = signr; \
281 info.si_errno = 0; \
282 info.si_code = sicode; \
283 info.si_addr = (void __user *)siaddr; \
284 do_trap(trapnr, signr, str, regs, error_code, &info); \
285}
286
287DO_ERROR( 1, SIGTRAP, "debug trap", debug_trap)
288DO_ERROR_INFO(0x20, SIGILL, "reserved instruction ", rie_handler, ILL_ILLOPC, regs->bpc)
289DO_ERROR_INFO(0x100, SIGILL, "privileged instruction", pie_handler, ILL_PRVOPC, regs->bpc)
290DO_ERROR_INFO(-1, SIGILL, "illegal trap", ill_trap, ILL_ILLTRP, regs->bpc)
291
292extern int handle_unaligned_access(unsigned long, struct pt_regs *);
293
294
295asmlinkage void do_alignment_check(struct pt_regs *regs, long error_code)
296{
297 mm_segment_t oldfs;
298 unsigned long insn;
299 int tmp;
300
301 oldfs = get_fs();
302
303 if (user_mode(regs)) {
304 local_irq_enable();
305 current->thread.error_code = error_code;
306 current->thread.trap_no = 0x17;
307
308 set_fs(USER_DS);
309 if (copy_from_user(&insn, (void *)regs->bpc, 4)) {
310 set_fs(oldfs);
311 goto uspace_segv;
312 }
313 tmp = handle_unaligned_access(insn, regs);
314 set_fs(oldfs);
315
316 if (!tmp)
317 return;
318
319 uspace_segv:
320 printk(KERN_NOTICE "Killing process \"%s\" due to unaligned "
321 "access\n", current->comm);
322 force_sig(SIGSEGV, current);
323 } else {
324 set_fs(KERNEL_DS);
325 if (copy_from_user(&insn, (void *)regs->bpc, 4)) {
326 set_fs(oldfs);
327 die("insn faulting in do_address_error", regs, 0);
328 }
329 handle_unaligned_access(insn, regs);
330 set_fs(oldfs);
331 }
332}
333
