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