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