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Linux/arch/sparc/kernel/traps_32.c

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  1 /*
  2  * arch/sparc/kernel/traps.c
  3  *
  4  * Copyright 1995, 2008 David S. Miller (davem@davemloft.net)
  5  * Copyright 2000 Jakub Jelinek (jakub@redhat.com)
  6  */
  7 
  8 /*
  9  * I hate traps on the sparc, grrr...
 10  */
 11 
 12 #include <linux/sched.h>  /* for jiffies */
 13 #include <linux/kernel.h>
 14 #include <linux/signal.h>
 15 #include <linux/smp.h>
 16 #include <linux/kdebug.h>
 17 #include <linux/export.h>
 18 
 19 #include <asm/delay.h>
 20 #include <asm/ptrace.h>
 21 #include <asm/oplib.h>
 22 #include <asm/page.h>
 23 #include <asm/pgtable.h>
 24 #include <asm/unistd.h>
 25 #include <asm/traps.h>
 26 
 27 #include "entry.h"
 28 #include "kernel.h"
 29 
 30 /* #define TRAP_DEBUG */
 31 
 32 static void instruction_dump(unsigned long *pc)
 33 {
 34         int i;
 35         
 36         if((((unsigned long) pc) & 3))
 37                 return;
 38 
 39         for(i = -3; i < 6; i++)
 40                 printk("%c%08lx%c",i?' ':'<',pc[i],i?' ':'>');
 41         printk("\n");
 42 }
 43 
 44 #define __SAVE __asm__ __volatile__("save %sp, -0x40, %sp\n\t")
 45 #define __RESTORE __asm__ __volatile__("restore %g0, %g0, %g0\n\t")
 46 
 47 void __noreturn die_if_kernel(char *str, struct pt_regs *regs)
 48 {
 49         static int die_counter;
 50         int count = 0;
 51 
 52         /* Amuse the user. */
 53         printk(
 54 "              \\|/ ____ \\|/\n"
 55 "              \"@'/ ,. \\`@\"\n"
 56 "              /_| \\__/ |_\\\n"
 57 "                 \\__U_/\n");
 58 
 59         printk("%s(%d): %s [#%d]\n", current->comm, task_pid_nr(current), str, ++die_counter);
 60         show_regs(regs);
 61         add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
 62 
 63         __SAVE; __SAVE; __SAVE; __SAVE;
 64         __SAVE; __SAVE; __SAVE; __SAVE;
 65         __RESTORE; __RESTORE; __RESTORE; __RESTORE;
 66         __RESTORE; __RESTORE; __RESTORE; __RESTORE;
 67 
 68         {
 69                 struct reg_window32 *rw = (struct reg_window32 *)regs->u_regs[UREG_FP];
 70 
 71                 /* Stop the back trace when we hit userland or we
 72                  * find some badly aligned kernel stack. Set an upper
 73                  * bound in case our stack is trashed and we loop.
 74                  */
 75                 while(rw                                        &&
 76                       count++ < 30                              &&
 77                       (((unsigned long) rw) >= PAGE_OFFSET)     &&
 78                       !(((unsigned long) rw) & 0x7)) {
 79                         printk("Caller[%08lx]: %pS\n", rw->ins[7],
 80                                (void *) rw->ins[7]);
 81                         rw = (struct reg_window32 *)rw->ins[6];
 82                 }
 83         }
 84         printk("Instruction DUMP:");
 85         instruction_dump ((unsigned long *) regs->pc);
 86         if(regs->psr & PSR_PS)
 87                 do_exit(SIGKILL);
 88         do_exit(SIGSEGV);
 89 }
 90 
 91 void do_hw_interrupt(struct pt_regs *regs, unsigned long type)
 92 {
 93         siginfo_t info;
 94 
 95         if(type < 0x80) {
 96                 /* Sun OS's puke from bad traps, Linux survives! */
 97                 printk("Unimplemented Sparc TRAP, type = %02lx\n", type);
 98                 die_if_kernel("Whee... Hello Mr. Penguin", regs);
 99         }       
100 
101         if(regs->psr & PSR_PS)
102                 die_if_kernel("Kernel bad trap", regs);
103 
104         info.si_signo = SIGILL;
105         info.si_errno = 0;
106         info.si_code = ILL_ILLTRP;
107         info.si_addr = (void __user *)regs->pc;
108         info.si_trapno = type - 0x80;
109         force_sig_info(SIGILL, &info, current);
110 }
111 
112 void do_illegal_instruction(struct pt_regs *regs, unsigned long pc, unsigned long npc,
113                             unsigned long psr)
114 {
115         siginfo_t info;
116 
117         if(psr & PSR_PS)
118                 die_if_kernel("Kernel illegal instruction", regs);
119 #ifdef TRAP_DEBUG
120         printk("Ill instr. at pc=%08lx instruction is %08lx\n",
121                regs->pc, *(unsigned long *)regs->pc);
122 #endif
123 
124         info.si_signo = SIGILL;
125         info.si_errno = 0;
126         info.si_code = ILL_ILLOPC;
127         info.si_addr = (void __user *)pc;
128         info.si_trapno = 0;
129         send_sig_info(SIGILL, &info, current);
130 }
131 
132 void do_priv_instruction(struct pt_regs *regs, unsigned long pc, unsigned long npc,
133                          unsigned long psr)
134 {
135         siginfo_t info;
136 
137         if(psr & PSR_PS)
138                 die_if_kernel("Penguin instruction from Penguin mode??!?!", regs);
139         info.si_signo = SIGILL;
140         info.si_errno = 0;
141         info.si_code = ILL_PRVOPC;
142         info.si_addr = (void __user *)pc;
143         info.si_trapno = 0;
144         send_sig_info(SIGILL, &info, current);
145 }
146 
147 /* XXX User may want to be allowed to do this. XXX */
148 
149 void do_memaccess_unaligned(struct pt_regs *regs, unsigned long pc, unsigned long npc,
150                             unsigned long psr)
151 {
152         siginfo_t info;
153 
154         if(regs->psr & PSR_PS) {
155                 printk("KERNEL MNA at pc %08lx npc %08lx called by %08lx\n", pc, npc,
156                        regs->u_regs[UREG_RETPC]);
157                 die_if_kernel("BOGUS", regs);
158                 /* die_if_kernel("Kernel MNA access", regs); */
159         }
160 #if 0
161         show_regs (regs);
162         instruction_dump ((unsigned long *) regs->pc);
163         printk ("do_MNA!\n");
164 #endif
165         info.si_signo = SIGBUS;
166         info.si_errno = 0;
167         info.si_code = BUS_ADRALN;
168         info.si_addr = /* FIXME: Should dig out mna address */ (void *)0;
169         info.si_trapno = 0;
170         send_sig_info(SIGBUS, &info, current);
171 }
172 
173 static unsigned long init_fsr = 0x0UL;
174 static unsigned long init_fregs[32] __attribute__ ((aligned (8))) =
175                 { ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL,
176                   ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL,
177                   ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL,
178                   ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL };
179 
180 void do_fpd_trap(struct pt_regs *regs, unsigned long pc, unsigned long npc,
181                  unsigned long psr)
182 {
183         /* Sanity check... */
184         if(psr & PSR_PS)
185                 die_if_kernel("Kernel gets FloatingPenguinUnit disabled trap", regs);
186 
187         put_psr(get_psr() | PSR_EF);    /* Allow FPU ops. */
188         regs->psr |= PSR_EF;
189 #ifndef CONFIG_SMP
190         if(last_task_used_math == current)
191                 return;
192         if(last_task_used_math) {
193                 /* Other processes fpu state, save away */
194                 struct task_struct *fptask = last_task_used_math;
195                 fpsave(&fptask->thread.float_regs[0], &fptask->thread.fsr,
196                        &fptask->thread.fpqueue[0], &fptask->thread.fpqdepth);
197         }
198         last_task_used_math = current;
199         if(used_math()) {
200                 fpload(&current->thread.float_regs[0], &current->thread.fsr);
201         } else {
202                 /* Set initial sane state. */
203                 fpload(&init_fregs[0], &init_fsr);
204                 set_used_math();
205         }
206 #else
207         if(!used_math()) {
208                 fpload(&init_fregs[0], &init_fsr);
209                 set_used_math();
210         } else {
211                 fpload(&current->thread.float_regs[0], &current->thread.fsr);
212         }
213         set_thread_flag(TIF_USEDFPU);
214 #endif
215 }
216 
217 static unsigned long fake_regs[32] __attribute__ ((aligned (8)));
218 static unsigned long fake_fsr;
219 static unsigned long fake_queue[32] __attribute__ ((aligned (8)));
220 static unsigned long fake_depth;
221 
222 void do_fpe_trap(struct pt_regs *regs, unsigned long pc, unsigned long npc,
223                  unsigned long psr)
224 {
225         static int calls;
226         siginfo_t info;
227         unsigned long fsr;
228         int ret = 0;
229 #ifndef CONFIG_SMP
230         struct task_struct *fpt = last_task_used_math;
231 #else
232         struct task_struct *fpt = current;
233 #endif
234         put_psr(get_psr() | PSR_EF);
235         /* If nobody owns the fpu right now, just clear the
236          * error into our fake static buffer and hope it don't
237          * happen again.  Thank you crashme...
238          */
239 #ifndef CONFIG_SMP
240         if(!fpt) {
241 #else
242         if (!test_tsk_thread_flag(fpt, TIF_USEDFPU)) {
243 #endif
244                 fpsave(&fake_regs[0], &fake_fsr, &fake_queue[0], &fake_depth);
245                 regs->psr &= ~PSR_EF;
246                 return;
247         }
248         fpsave(&fpt->thread.float_regs[0], &fpt->thread.fsr,
249                &fpt->thread.fpqueue[0], &fpt->thread.fpqdepth);
250 #ifdef DEBUG_FPU
251         printk("Hmm, FP exception, fsr was %016lx\n", fpt->thread.fsr);
252 #endif
253 
254         switch ((fpt->thread.fsr & 0x1c000)) {
255         /* switch on the contents of the ftt [floating point trap type] field */
256 #ifdef DEBUG_FPU
257         case (1 << 14):
258                 printk("IEEE_754_exception\n");
259                 break;
260 #endif
261         case (2 << 14):  /* unfinished_FPop (underflow & co) */
262         case (3 << 14):  /* unimplemented_FPop (quad stuff, maybe sqrt) */
263                 ret = do_mathemu(regs, fpt);
264                 break;
265 #ifdef DEBUG_FPU
266         case (4 << 14):
267                 printk("sequence_error (OS bug...)\n");
268                 break;
269         case (5 << 14):
270                 printk("hardware_error (uhoh!)\n");
271                 break;
272         case (6 << 14):
273                 printk("invalid_fp_register (user error)\n");
274                 break;
275 #endif /* DEBUG_FPU */
276         }
277         /* If we successfully emulated the FPop, we pretend the trap never happened :-> */
278         if (ret) {
279                 fpload(&current->thread.float_regs[0], &current->thread.fsr);
280                 return;
281         }
282         /* nope, better SIGFPE the offending process... */
283                
284 #ifdef CONFIG_SMP
285         clear_tsk_thread_flag(fpt, TIF_USEDFPU);
286 #endif
287         if(psr & PSR_PS) {
288                 /* The first fsr store/load we tried trapped,
289                  * the second one will not (we hope).
290                  */
291                 printk("WARNING: FPU exception from kernel mode. at pc=%08lx\n",
292                        regs->pc);
293                 regs->pc = regs->npc;
294                 regs->npc += 4;
295                 calls++;
296                 if(calls > 2)
297                         die_if_kernel("Too many Penguin-FPU traps from kernel mode",
298                                       regs);
299                 return;
300         }
301 
302         fsr = fpt->thread.fsr;
303         info.si_signo = SIGFPE;
304         info.si_errno = 0;
305         info.si_addr = (void __user *)pc;
306         info.si_trapno = 0;
307         info.si_code = __SI_FAULT;
308         if ((fsr & 0x1c000) == (1 << 14)) {
309                 if (fsr & 0x10)
310                         info.si_code = FPE_FLTINV;
311                 else if (fsr & 0x08)
312                         info.si_code = FPE_FLTOVF;
313                 else if (fsr & 0x04)
314                         info.si_code = FPE_FLTUND;
315                 else if (fsr & 0x02)
316                         info.si_code = FPE_FLTDIV;
317                 else if (fsr & 0x01)
318                         info.si_code = FPE_FLTRES;
319         }
320         send_sig_info(SIGFPE, &info, fpt);
321 #ifndef CONFIG_SMP
322         last_task_used_math = NULL;
323 #endif
324         regs->psr &= ~PSR_EF;
325         if(calls > 0)
326                 calls=0;
327 }
328 
329 void handle_tag_overflow(struct pt_regs *regs, unsigned long pc, unsigned long npc,
330                          unsigned long psr)
331 {
332         siginfo_t info;
333 
334         if(psr & PSR_PS)
335                 die_if_kernel("Penguin overflow trap from kernel mode", regs);
336         info.si_signo = SIGEMT;
337         info.si_errno = 0;
338         info.si_code = EMT_TAGOVF;
339         info.si_addr = (void __user *)pc;
340         info.si_trapno = 0;
341         send_sig_info(SIGEMT, &info, current);
342 }
343 
344 void handle_watchpoint(struct pt_regs *regs, unsigned long pc, unsigned long npc,
345                        unsigned long psr)
346 {
347 #ifdef TRAP_DEBUG
348         printk("Watchpoint detected at PC %08lx NPC %08lx PSR %08lx\n",
349                pc, npc, psr);
350 #endif
351         if(psr & PSR_PS)
352                 panic("Tell me what a watchpoint trap is, and I'll then deal "
353                       "with such a beast...");
354 }
355 
356 void handle_reg_access(struct pt_regs *regs, unsigned long pc, unsigned long npc,
357                        unsigned long psr)
358 {
359         siginfo_t info;
360 
361 #ifdef TRAP_DEBUG
362         printk("Register Access Exception at PC %08lx NPC %08lx PSR %08lx\n",
363                pc, npc, psr);
364 #endif
365         info.si_signo = SIGBUS;
366         info.si_errno = 0;
367         info.si_code = BUS_OBJERR;
368         info.si_addr = (void __user *)pc;
369         info.si_trapno = 0;
370         force_sig_info(SIGBUS, &info, current);
371 }
372 
373 void handle_cp_disabled(struct pt_regs *regs, unsigned long pc, unsigned long npc,
374                         unsigned long psr)
375 {
376         siginfo_t info;
377 
378         info.si_signo = SIGILL;
379         info.si_errno = 0;
380         info.si_code = ILL_COPROC;
381         info.si_addr = (void __user *)pc;
382         info.si_trapno = 0;
383         send_sig_info(SIGILL, &info, current);
384 }
385 
386 void handle_cp_exception(struct pt_regs *regs, unsigned long pc, unsigned long npc,
387                          unsigned long psr)
388 {
389         siginfo_t info;
390 
391 #ifdef TRAP_DEBUG
392         printk("Co-Processor Exception at PC %08lx NPC %08lx PSR %08lx\n",
393                pc, npc, psr);
394 #endif
395         info.si_signo = SIGILL;
396         info.si_errno = 0;
397         info.si_code = ILL_COPROC;
398         info.si_addr = (void __user *)pc;
399         info.si_trapno = 0;
400         send_sig_info(SIGILL, &info, current);
401 }
402 
403 void handle_hw_divzero(struct pt_regs *regs, unsigned long pc, unsigned long npc,
404                        unsigned long psr)
405 {
406         siginfo_t info;
407 
408         info.si_signo = SIGFPE;
409         info.si_errno = 0;
410         info.si_code = FPE_INTDIV;
411         info.si_addr = (void __user *)pc;
412         info.si_trapno = 0;
413         send_sig_info(SIGFPE, &info, current);
414 }
415 
416 #ifdef CONFIG_DEBUG_BUGVERBOSE
417 void do_BUG(const char *file, int line)
418 {
419         // bust_spinlocks(1);   XXX Not in our original BUG()
420         printk("kernel BUG at %s:%d!\n", file, line);
421 }
422 EXPORT_SYMBOL(do_BUG);
423 #endif
424 
425 /* Since we have our mappings set up, on multiprocessors we can spin them
426  * up here so that timer interrupts work during initialization.
427  */
428 
429 void trap_init(void)
430 {
431         extern void thread_info_offsets_are_bolixed_pete(void);
432 
433         /* Force linker to barf if mismatched */
434         if (TI_UWINMASK    != offsetof(struct thread_info, uwinmask) ||
435             TI_TASK        != offsetof(struct thread_info, task) ||
436             TI_FLAGS       != offsetof(struct thread_info, flags) ||
437             TI_CPU         != offsetof(struct thread_info, cpu) ||
438             TI_PREEMPT     != offsetof(struct thread_info, preempt_count) ||
439             TI_SOFTIRQ     != offsetof(struct thread_info, softirq_count) ||
440             TI_HARDIRQ     != offsetof(struct thread_info, hardirq_count) ||
441             TI_KSP         != offsetof(struct thread_info, ksp) ||
442             TI_KPC         != offsetof(struct thread_info, kpc) ||
443             TI_KPSR        != offsetof(struct thread_info, kpsr) ||
444             TI_KWIM        != offsetof(struct thread_info, kwim) ||
445             TI_REG_WINDOW  != offsetof(struct thread_info, reg_window) ||
446             TI_RWIN_SPTRS  != offsetof(struct thread_info, rwbuf_stkptrs) ||
447             TI_W_SAVED     != offsetof(struct thread_info, w_saved))
448                 thread_info_offsets_are_bolixed_pete();
449 
450         /* Attach to the address space of init_task. */
451         atomic_inc(&init_mm.mm_count);
452         current->active_mm = &init_mm;
453 
454         /* NOTE: Other cpus have this done as they are started
455          *       up on SMP.
456          */
457 }
458 

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