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TOMOYO Linux Cross Reference
Linux/arch/sparc/kernel/traps_32.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * arch/sparc/kernel/traps.c
  4  *
  5  * Copyright 1995, 2008 David S. Miller (davem@davemloft.net)
  6  * Copyright 2000 Jakub Jelinek (jakub@redhat.com)
  7  */
  8 
  9 /*
 10  * I hate traps on the sparc, grrr...
 11  */
 12 
 13 #include <linux/sched/mm.h>
 14 #include <linux/sched/debug.h>
 15 #include <linux/mm_types.h>
 16 #include <linux/kernel.h>
 17 #include <linux/signal.h>
 18 #include <linux/smp.h>
 19 #include <linux/kdebug.h>
 20 #include <linux/export.h>
 21 
 22 #include <asm/delay.h>
 23 #include <asm/ptrace.h>
 24 #include <asm/oplib.h>
 25 #include <asm/page.h>
 26 #include <asm/pgtable.h>
 27 #include <asm/unistd.h>
 28 #include <asm/traps.h>
 29 
 30 #include "entry.h"
 31 #include "kernel.h"
 32 
 33 /* #define TRAP_DEBUG */
 34 
 35 static void instruction_dump(unsigned long *pc)
 36 {
 37         int i;
 38         
 39         if((((unsigned long) pc) & 3))
 40                 return;
 41 
 42         for(i = -3; i < 6; i++)
 43                 printk("%c%08lx%c",i?' ':'<',pc[i],i?' ':'>');
 44         printk("\n");
 45 }
 46 
 47 #define __SAVE __asm__ __volatile__("save %sp, -0x40, %sp\n\t")
 48 #define __RESTORE __asm__ __volatile__("restore %g0, %g0, %g0\n\t")
 49 
 50 void __noreturn die_if_kernel(char *str, struct pt_regs *regs)
 51 {
 52         static int die_counter;
 53         int count = 0;
 54 
 55         /* Amuse the user. */
 56         printk(
 57 "              \\|/ ____ \\|/\n"
 58 "              \"@'/ ,. \\`@\"\n"
 59 "              /_| \\__/ |_\\\n"
 60 "                 \\__U_/\n");
 61 
 62         printk("%s(%d): %s [#%d]\n", current->comm, task_pid_nr(current), str, ++die_counter);
 63         show_regs(regs);
 64         add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
 65 
 66         __SAVE; __SAVE; __SAVE; __SAVE;
 67         __SAVE; __SAVE; __SAVE; __SAVE;
 68         __RESTORE; __RESTORE; __RESTORE; __RESTORE;
 69         __RESTORE; __RESTORE; __RESTORE; __RESTORE;
 70 
 71         {
 72                 struct reg_window32 *rw = (struct reg_window32 *)regs->u_regs[UREG_FP];
 73 
 74                 /* Stop the back trace when we hit userland or we
 75                  * find some badly aligned kernel stack. Set an upper
 76                  * bound in case our stack is trashed and we loop.
 77                  */
 78                 while(rw                                        &&
 79                       count++ < 30                              &&
 80                       (((unsigned long) rw) >= PAGE_OFFSET)     &&
 81                       !(((unsigned long) rw) & 0x7)) {
 82                         printk("Caller[%08lx]: %pS\n", rw->ins[7],
 83                                (void *) rw->ins[7]);
 84                         rw = (struct reg_window32 *)rw->ins[6];
 85                 }
 86         }
 87         printk("Instruction DUMP:");
 88         instruction_dump ((unsigned long *) regs->pc);
 89         if(regs->psr & PSR_PS)
 90                 do_exit(SIGKILL);
 91         do_exit(SIGSEGV);
 92 }
 93 
 94 void do_hw_interrupt(struct pt_regs *regs, unsigned long type)
 95 {
 96         siginfo_t info;
 97 
 98         if(type < 0x80) {
 99                 /* Sun OS's puke from bad traps, Linux survives! */
100                 printk("Unimplemented Sparc TRAP, type = %02lx\n", type);
101                 die_if_kernel("Whee... Hello Mr. Penguin", regs);
102         }       
103 
104         if(regs->psr & PSR_PS)
105                 die_if_kernel("Kernel bad trap", regs);
106 
107         info.si_signo = SIGILL;
108         info.si_errno = 0;
109         info.si_code = ILL_ILLTRP;
110         info.si_addr = (void __user *)regs->pc;
111         info.si_trapno = type - 0x80;
112         force_sig_info(SIGILL, &info, current);
113 }
114 
115 void do_illegal_instruction(struct pt_regs *regs, unsigned long pc, unsigned long npc,
116                             unsigned long psr)
117 {
118         siginfo_t info;
119 
120         if(psr & PSR_PS)
121                 die_if_kernel("Kernel illegal instruction", regs);
122 #ifdef TRAP_DEBUG
123         printk("Ill instr. at pc=%08lx instruction is %08lx\n",
124                regs->pc, *(unsigned long *)regs->pc);
125 #endif
126 
127         info.si_signo = SIGILL;
128         info.si_errno = 0;
129         info.si_code = ILL_ILLOPC;
130         info.si_addr = (void __user *)pc;
131         info.si_trapno = 0;
132         send_sig_info(SIGILL, &info, current);
133 }
134 
135 void do_priv_instruction(struct pt_regs *regs, unsigned long pc, unsigned long npc,
136                          unsigned long psr)
137 {
138         siginfo_t info;
139 
140         if(psr & PSR_PS)
141                 die_if_kernel("Penguin instruction from Penguin mode??!?!", regs);
142         info.si_signo = SIGILL;
143         info.si_errno = 0;
144         info.si_code = ILL_PRVOPC;
145         info.si_addr = (void __user *)pc;
146         info.si_trapno = 0;
147         send_sig_info(SIGILL, &info, current);
148 }
149 
150 /* XXX User may want to be allowed to do this. XXX */
151 
152 void do_memaccess_unaligned(struct pt_regs *regs, unsigned long pc, unsigned long npc,
153                             unsigned long psr)
154 {
155         siginfo_t info;
156 
157         if(regs->psr & PSR_PS) {
158                 printk("KERNEL MNA at pc %08lx npc %08lx called by %08lx\n", pc, npc,
159                        regs->u_regs[UREG_RETPC]);
160                 die_if_kernel("BOGUS", regs);
161                 /* die_if_kernel("Kernel MNA access", regs); */
162         }
163 #if 0
164         show_regs (regs);
165         instruction_dump ((unsigned long *) regs->pc);
166         printk ("do_MNA!\n");
167 #endif
168         info.si_signo = SIGBUS;
169         info.si_errno = 0;
170         info.si_code = BUS_ADRALN;
171         info.si_addr = /* FIXME: Should dig out mna address */ (void *)0;
172         info.si_trapno = 0;
173         send_sig_info(SIGBUS, &info, current);
174 }
175 
176 static unsigned long init_fsr = 0x0UL;
177 static unsigned long init_fregs[32] __attribute__ ((aligned (8))) =
178                 { ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL,
179                   ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL,
180                   ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL,
181                   ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL };
182 
183 void do_fpd_trap(struct pt_regs *regs, unsigned long pc, unsigned long npc,
184                  unsigned long psr)
185 {
186         /* Sanity check... */
187         if(psr & PSR_PS)
188                 die_if_kernel("Kernel gets FloatingPenguinUnit disabled trap", regs);
189 
190         put_psr(get_psr() | PSR_EF);    /* Allow FPU ops. */
191         regs->psr |= PSR_EF;
192 #ifndef CONFIG_SMP
193         if(last_task_used_math == current)
194                 return;
195         if(last_task_used_math) {
196                 /* Other processes fpu state, save away */
197                 struct task_struct *fptask = last_task_used_math;
198                 fpsave(&fptask->thread.float_regs[0], &fptask->thread.fsr,
199                        &fptask->thread.fpqueue[0], &fptask->thread.fpqdepth);
200         }
201         last_task_used_math = current;
202         if(used_math()) {
203                 fpload(&current->thread.float_regs[0], &current->thread.fsr);
204         } else {
205                 /* Set initial sane state. */
206                 fpload(&init_fregs[0], &init_fsr);
207                 set_used_math();
208         }
209 #else
210         if(!used_math()) {
211                 fpload(&init_fregs[0], &init_fsr);
212                 set_used_math();
213         } else {
214                 fpload(&current->thread.float_regs[0], &current->thread.fsr);
215         }
216         set_thread_flag(TIF_USEDFPU);
217 #endif
218 }
219 
220 static unsigned long fake_regs[32] __attribute__ ((aligned (8)));
221 static unsigned long fake_fsr;
222 static unsigned long fake_queue[32] __attribute__ ((aligned (8)));
223 static unsigned long fake_depth;
224 
225 void do_fpe_trap(struct pt_regs *regs, unsigned long pc, unsigned long npc,
226                  unsigned long psr)
227 {
228         static int calls;
229         siginfo_t info;
230         unsigned long fsr;
231         int ret = 0;
232 #ifndef CONFIG_SMP
233         struct task_struct *fpt = last_task_used_math;
234 #else
235         struct task_struct *fpt = current;
236 #endif
237         put_psr(get_psr() | PSR_EF);
238         /* If nobody owns the fpu right now, just clear the
239          * error into our fake static buffer and hope it don't
240          * happen again.  Thank you crashme...
241          */
242 #ifndef CONFIG_SMP
243         if(!fpt) {
244 #else
245         if (!test_tsk_thread_flag(fpt, TIF_USEDFPU)) {
246 #endif
247                 fpsave(&fake_regs[0], &fake_fsr, &fake_queue[0], &fake_depth);
248                 regs->psr &= ~PSR_EF;
249                 return;
250         }
251         fpsave(&fpt->thread.float_regs[0], &fpt->thread.fsr,
252                &fpt->thread.fpqueue[0], &fpt->thread.fpqdepth);
253 #ifdef DEBUG_FPU
254         printk("Hmm, FP exception, fsr was %016lx\n", fpt->thread.fsr);
255 #endif
256 
257         switch ((fpt->thread.fsr & 0x1c000)) {
258         /* switch on the contents of the ftt [floating point trap type] field */
259 #ifdef DEBUG_FPU
260         case (1 << 14):
261                 printk("IEEE_754_exception\n");
262                 break;
263 #endif
264         case (2 << 14):  /* unfinished_FPop (underflow & co) */
265         case (3 << 14):  /* unimplemented_FPop (quad stuff, maybe sqrt) */
266                 ret = do_mathemu(regs, fpt);
267                 break;
268 #ifdef DEBUG_FPU
269         case (4 << 14):
270                 printk("sequence_error (OS bug...)\n");
271                 break;
272         case (5 << 14):
273                 printk("hardware_error (uhoh!)\n");
274                 break;
275         case (6 << 14):
276                 printk("invalid_fp_register (user error)\n");
277                 break;
278 #endif /* DEBUG_FPU */
279         }
280         /* If we successfully emulated the FPop, we pretend the trap never happened :-> */
281         if (ret) {
282                 fpload(&current->thread.float_regs[0], &current->thread.fsr);
283                 return;
284         }
285         /* nope, better SIGFPE the offending process... */
286                
287 #ifdef CONFIG_SMP
288         clear_tsk_thread_flag(fpt, TIF_USEDFPU);
289 #endif
290         if(psr & PSR_PS) {
291                 /* The first fsr store/load we tried trapped,
292                  * the second one will not (we hope).
293                  */
294                 printk("WARNING: FPU exception from kernel mode. at pc=%08lx\n",
295                        regs->pc);
296                 regs->pc = regs->npc;
297                 regs->npc += 4;
298                 calls++;
299                 if(calls > 2)
300                         die_if_kernel("Too many Penguin-FPU traps from kernel mode",
301                                       regs);
302                 return;
303         }
304 
305         fsr = fpt->thread.fsr;
306         info.si_signo = SIGFPE;
307         info.si_errno = 0;
308         info.si_addr = (void __user *)pc;
309         info.si_trapno = 0;
310         info.si_code = FPE_FIXME;
311         if ((fsr & 0x1c000) == (1 << 14)) {
312                 if (fsr & 0x10)
313                         info.si_code = FPE_FLTINV;
314                 else if (fsr & 0x08)
315                         info.si_code = FPE_FLTOVF;
316                 else if (fsr & 0x04)
317                         info.si_code = FPE_FLTUND;
318                 else if (fsr & 0x02)
319                         info.si_code = FPE_FLTDIV;
320                 else if (fsr & 0x01)
321                         info.si_code = FPE_FLTRES;
322         }
323         send_sig_info(SIGFPE, &info, fpt);
324 #ifndef CONFIG_SMP
325         last_task_used_math = NULL;
326 #endif
327         regs->psr &= ~PSR_EF;
328         if(calls > 0)
329                 calls=0;
330 }
331 
332 void handle_tag_overflow(struct pt_regs *regs, unsigned long pc, unsigned long npc,
333                          unsigned long psr)
334 {
335         siginfo_t info;
336 
337         if(psr & PSR_PS)
338                 die_if_kernel("Penguin overflow trap from kernel mode", regs);
339         info.si_signo = SIGEMT;
340         info.si_errno = 0;
341         info.si_code = EMT_TAGOVF;
342         info.si_addr = (void __user *)pc;
343         info.si_trapno = 0;
344         send_sig_info(SIGEMT, &info, current);
345 }
346 
347 void handle_watchpoint(struct pt_regs *regs, unsigned long pc, unsigned long npc,
348                        unsigned long psr)
349 {
350 #ifdef TRAP_DEBUG
351         printk("Watchpoint detected at PC %08lx NPC %08lx PSR %08lx\n",
352                pc, npc, psr);
353 #endif
354         if(psr & PSR_PS)
355                 panic("Tell me what a watchpoint trap is, and I'll then deal "
356                       "with such a beast...");
357 }
358 
359 void handle_reg_access(struct pt_regs *regs, unsigned long pc, unsigned long npc,
360                        unsigned long psr)
361 {
362         siginfo_t info;
363 
364 #ifdef TRAP_DEBUG
365         printk("Register Access Exception at PC %08lx NPC %08lx PSR %08lx\n",
366                pc, npc, psr);
367 #endif
368         info.si_signo = SIGBUS;
369         info.si_errno = 0;
370         info.si_code = BUS_OBJERR;
371         info.si_addr = (void __user *)pc;
372         info.si_trapno = 0;
373         force_sig_info(SIGBUS, &info, current);
374 }
375 
376 void handle_cp_disabled(struct pt_regs *regs, unsigned long pc, unsigned long npc,
377                         unsigned long psr)
378 {
379         siginfo_t info;
380 
381         info.si_signo = SIGILL;
382         info.si_errno = 0;
383         info.si_code = ILL_COPROC;
384         info.si_addr = (void __user *)pc;
385         info.si_trapno = 0;
386         send_sig_info(SIGILL, &info, current);
387 }
388 
389 void handle_cp_exception(struct pt_regs *regs, unsigned long pc, unsigned long npc,
390                          unsigned long psr)
391 {
392         siginfo_t info;
393 
394 #ifdef TRAP_DEBUG
395         printk("Co-Processor Exception at PC %08lx NPC %08lx PSR %08lx\n",
396                pc, npc, psr);
397 #endif
398         info.si_signo = SIGILL;
399         info.si_errno = 0;
400         info.si_code = ILL_COPROC;
401         info.si_addr = (void __user *)pc;
402         info.si_trapno = 0;
403         send_sig_info(SIGILL, &info, current);
404 }
405 
406 void handle_hw_divzero(struct pt_regs *regs, unsigned long pc, unsigned long npc,
407                        unsigned long psr)
408 {
409         siginfo_t info;
410 
411         info.si_signo = SIGFPE;
412         info.si_errno = 0;
413         info.si_code = FPE_INTDIV;
414         info.si_addr = (void __user *)pc;
415         info.si_trapno = 0;
416         send_sig_info(SIGFPE, &info, current);
417 }
418 
419 #ifdef CONFIG_DEBUG_BUGVERBOSE
420 void do_BUG(const char *file, int line)
421 {
422         // bust_spinlocks(1);   XXX Not in our original BUG()
423         printk("kernel BUG at %s:%d!\n", file, line);
424 }
425 EXPORT_SYMBOL(do_BUG);
426 #endif
427 
428 /* Since we have our mappings set up, on multiprocessors we can spin them
429  * up here so that timer interrupts work during initialization.
430  */
431 
432 void trap_init(void)
433 {
434         extern void thread_info_offsets_are_bolixed_pete(void);
435 
436         /* Force linker to barf if mismatched */
437         if (TI_UWINMASK    != offsetof(struct thread_info, uwinmask) ||
438             TI_TASK        != offsetof(struct thread_info, task) ||
439             TI_FLAGS       != offsetof(struct thread_info, flags) ||
440             TI_CPU         != offsetof(struct thread_info, cpu) ||
441             TI_PREEMPT     != offsetof(struct thread_info, preempt_count) ||
442             TI_SOFTIRQ     != offsetof(struct thread_info, softirq_count) ||
443             TI_HARDIRQ     != offsetof(struct thread_info, hardirq_count) ||
444             TI_KSP         != offsetof(struct thread_info, ksp) ||
445             TI_KPC         != offsetof(struct thread_info, kpc) ||
446             TI_KPSR        != offsetof(struct thread_info, kpsr) ||
447             TI_KWIM        != offsetof(struct thread_info, kwim) ||
448             TI_REG_WINDOW  != offsetof(struct thread_info, reg_window) ||
449             TI_RWIN_SPTRS  != offsetof(struct thread_info, rwbuf_stkptrs) ||
450             TI_W_SAVED     != offsetof(struct thread_info, w_saved))
451                 thread_info_offsets_are_bolixed_pete();
452 
453         /* Attach to the address space of init_task. */
454         mmgrab(&init_mm);
455         current->active_mm = &init_mm;
456 
457         /* NOTE: Other cpus have this done as they are started
458          *       up on SMP.
459          */
460 }
461 

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