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Linux/arch/m32r/kernel/traps.c

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  1 /*
  2  *  linux/arch/m32r/kernel/traps.c
  3  *
  4  *  Copyright (C) 2001, 2002  Hirokazu Takata, Hiroyuki Kondo,
  5  *                            Hitoshi Yamamoto
  6  */
  7 
  8 /*
  9  * 'traps.c' handles hardware traps and faults after we have saved some
 10  * state in 'entry.S'.
 11  */
 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 <linux/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 
 29 asmlinkage void alignment_check(void);
 30 asmlinkage void ei_handler(void);
 31 asmlinkage void rie_handler(void);
 32 asmlinkage void debug_trap(void);
 33 asmlinkage void cache_flushing_handler(void);
 34 asmlinkage void ill_trap(void);
 35 
 36 #ifdef CONFIG_SMP
 37 extern void smp_reschedule_interrupt(void);
 38 extern void smp_invalidate_interrupt(void);
 39 extern void smp_call_function_interrupt(void);
 40 extern void smp_ipi_timer_interrupt(void);
 41 extern void smp_flush_cache_all_interrupt(void);
 42 extern void smp_call_function_single_interrupt(void);
 43 
 44 /*
 45  * for Boot AP function
 46  */
 47 asm (
 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  /* CONFIG_SMP */
 57 
 58 extern unsigned long    eit_vector[];
 59 #define BRA_INSN(func, entry)   \
 60         ((unsigned long)func - (unsigned long)eit_vector - entry*4)/4 \
 61         + 0xff000000UL
 62 
 63 static 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; /* seth r0, 0x01 */
 73         eit_vector[1] = BRA_INSN(default_eit_handler, 1);
 74         eit_vector[4] = 0xd0c00010; /* seth r0, 0x10 */
 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 /* CONFIG_MMU */
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;    /* CPU_BOOT_IPI */
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 
113 void __init trap_init(void)
114 {
115         set_eit_vector_entries();
116 
117         /*
118          * Should be a barrier for any external CPU state.
119          */
120         cpu_init();
121 }
122 
123 static int kstack_depth_to_print = 24;
124 
125 static 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 
141 void show_stack(struct task_struct *task, unsigned long *sp)
142 {
143         unsigned long  *stack;
144         int  i;
145 
146         /*
147          * debugging aid: "show_stack(NULL);" prints the
148          * back trace for this cpu.
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 
170 static 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          * When in-kernel, we also print out the stack and code at the
192          * time of the fault..
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])) {
205 bad:
206                                 printk(" Bad PC value.");
207                                 break;
208                         }
209                         printk("%02x ", c);
210                 }
211         }
212         printk("\n");
213 }
214 
215 static DEFINE_SPINLOCK(die_lock);
216 
217 void 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 
229 static __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 
236 static __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                 /* trap_signal */
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                 /* kernel_trap */
251                 if (!fixup_exception(regs))
252                         die(str, regs, error_code);
253                 return;
254         }
255 }
256 
257 #define DO_ERROR(trapnr, signr, str, name) \
258 asmlinkage 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) \
264 asmlinkage 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 
274 DO_ERROR( 1, SIGTRAP, "debug trap", debug_trap)
275 DO_ERROR_INFO(0x20, SIGILL,  "reserved instruction ", rie_handler, ILL_ILLOPC, regs->bpc)
276 DO_ERROR_INFO(0x100, SIGILL,  "privileged instruction", pie_handler, ILL_PRVOPC, regs->bpc)
277 DO_ERROR_INFO(-1, SIGILL,  "illegal trap", ill_trap, ILL_ILLTRP, regs->bpc)
278 
279 extern int handle_unaligned_access(unsigned long, struct pt_regs *);
280 
281 /* This code taken from arch/sh/kernel/traps.c */
282 asmlinkage 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 

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