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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         if(type < 0x80) {
 97                 /* Sun OS's puke from bad traps, Linux survives! */
 98                 printk("Unimplemented Sparc TRAP, type = %02lx\n", type);
 99                 die_if_kernel("Whee... Hello Mr. Penguin", regs);
100         }       
101 
102         if(regs->psr & PSR_PS)
103                 die_if_kernel("Kernel bad trap", regs);
104 
105         force_sig_fault(SIGILL, ILL_ILLTRP,
106                         (void __user *)regs->pc, type - 0x80, current);
107 }
108 
109 void do_illegal_instruction(struct pt_regs *regs, unsigned long pc, unsigned long npc,
110                             unsigned long psr)
111 {
112         if(psr & PSR_PS)
113                 die_if_kernel("Kernel illegal instruction", regs);
114 #ifdef TRAP_DEBUG
115         printk("Ill instr. at pc=%08lx instruction is %08lx\n",
116                regs->pc, *(unsigned long *)regs->pc);
117 #endif
118 
119         send_sig_fault(SIGILL, ILL_ILLOPC, (void __user *)pc, 0, current);
120 }
121 
122 void do_priv_instruction(struct pt_regs *regs, unsigned long pc, unsigned long npc,
123                          unsigned long psr)
124 {
125         if(psr & PSR_PS)
126                 die_if_kernel("Penguin instruction from Penguin mode??!?!", regs);
127         send_sig_fault(SIGILL, ILL_PRVOPC, (void __user *)pc, 0, current);
128 }
129 
130 /* XXX User may want to be allowed to do this. XXX */
131 
132 void do_memaccess_unaligned(struct pt_regs *regs, unsigned long pc, unsigned long npc,
133                             unsigned long psr)
134 {
135         if(regs->psr & PSR_PS) {
136                 printk("KERNEL MNA at pc %08lx npc %08lx called by %08lx\n", pc, npc,
137                        regs->u_regs[UREG_RETPC]);
138                 die_if_kernel("BOGUS", regs);
139                 /* die_if_kernel("Kernel MNA access", regs); */
140         }
141 #if 0
142         show_regs (regs);
143         instruction_dump ((unsigned long *) regs->pc);
144         printk ("do_MNA!\n");
145 #endif
146         send_sig_fault(SIGBUS, BUS_ADRALN,
147                        /* FIXME: Should dig out mna address */ (void *)0,
148                        0, current);
149 }
150 
151 static unsigned long init_fsr = 0x0UL;
152 static unsigned long init_fregs[32] __attribute__ ((aligned (8))) =
153                 { ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL,
154                   ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL,
155                   ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL,
156                   ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL };
157 
158 void do_fpd_trap(struct pt_regs *regs, unsigned long pc, unsigned long npc,
159                  unsigned long psr)
160 {
161         /* Sanity check... */
162         if(psr & PSR_PS)
163                 die_if_kernel("Kernel gets FloatingPenguinUnit disabled trap", regs);
164 
165         put_psr(get_psr() | PSR_EF);    /* Allow FPU ops. */
166         regs->psr |= PSR_EF;
167 #ifndef CONFIG_SMP
168         if(last_task_used_math == current)
169                 return;
170         if(last_task_used_math) {
171                 /* Other processes fpu state, save away */
172                 struct task_struct *fptask = last_task_used_math;
173                 fpsave(&fptask->thread.float_regs[0], &fptask->thread.fsr,
174                        &fptask->thread.fpqueue[0], &fptask->thread.fpqdepth);
175         }
176         last_task_used_math = current;
177         if(used_math()) {
178                 fpload(&current->thread.float_regs[0], &current->thread.fsr);
179         } else {
180                 /* Set initial sane state. */
181                 fpload(&init_fregs[0], &init_fsr);
182                 set_used_math();
183         }
184 #else
185         if(!used_math()) {
186                 fpload(&init_fregs[0], &init_fsr);
187                 set_used_math();
188         } else {
189                 fpload(&current->thread.float_regs[0], &current->thread.fsr);
190         }
191         set_thread_flag(TIF_USEDFPU);
192 #endif
193 }
194 
195 static unsigned long fake_regs[32] __attribute__ ((aligned (8)));
196 static unsigned long fake_fsr;
197 static unsigned long fake_queue[32] __attribute__ ((aligned (8)));
198 static unsigned long fake_depth;
199 
200 void do_fpe_trap(struct pt_regs *regs, unsigned long pc, unsigned long npc,
201                  unsigned long psr)
202 {
203         static int calls;
204         unsigned long fsr;
205         int ret = 0;
206         int code;
207 #ifndef CONFIG_SMP
208         struct task_struct *fpt = last_task_used_math;
209 #else
210         struct task_struct *fpt = current;
211 #endif
212         put_psr(get_psr() | PSR_EF);
213         /* If nobody owns the fpu right now, just clear the
214          * error into our fake static buffer and hope it don't
215          * happen again.  Thank you crashme...
216          */
217 #ifndef CONFIG_SMP
218         if(!fpt) {
219 #else
220         if (!test_tsk_thread_flag(fpt, TIF_USEDFPU)) {
221 #endif
222                 fpsave(&fake_regs[0], &fake_fsr, &fake_queue[0], &fake_depth);
223                 regs->psr &= ~PSR_EF;
224                 return;
225         }
226         fpsave(&fpt->thread.float_regs[0], &fpt->thread.fsr,
227                &fpt->thread.fpqueue[0], &fpt->thread.fpqdepth);
228 #ifdef DEBUG_FPU
229         printk("Hmm, FP exception, fsr was %016lx\n", fpt->thread.fsr);
230 #endif
231 
232         switch ((fpt->thread.fsr & 0x1c000)) {
233         /* switch on the contents of the ftt [floating point trap type] field */
234 #ifdef DEBUG_FPU
235         case (1 << 14):
236                 printk("IEEE_754_exception\n");
237                 break;
238 #endif
239         case (2 << 14):  /* unfinished_FPop (underflow & co) */
240         case (3 << 14):  /* unimplemented_FPop (quad stuff, maybe sqrt) */
241                 ret = do_mathemu(regs, fpt);
242                 break;
243 #ifdef DEBUG_FPU
244         case (4 << 14):
245                 printk("sequence_error (OS bug...)\n");
246                 break;
247         case (5 << 14):
248                 printk("hardware_error (uhoh!)\n");
249                 break;
250         case (6 << 14):
251                 printk("invalid_fp_register (user error)\n");
252                 break;
253 #endif /* DEBUG_FPU */
254         }
255         /* If we successfully emulated the FPop, we pretend the trap never happened :-> */
256         if (ret) {
257                 fpload(&current->thread.float_regs[0], &current->thread.fsr);
258                 return;
259         }
260         /* nope, better SIGFPE the offending process... */
261                
262 #ifdef CONFIG_SMP
263         clear_tsk_thread_flag(fpt, TIF_USEDFPU);
264 #endif
265         if(psr & PSR_PS) {
266                 /* The first fsr store/load we tried trapped,
267                  * the second one will not (we hope).
268                  */
269                 printk("WARNING: FPU exception from kernel mode. at pc=%08lx\n",
270                        regs->pc);
271                 regs->pc = regs->npc;
272                 regs->npc += 4;
273                 calls++;
274                 if(calls > 2)
275                         die_if_kernel("Too many Penguin-FPU traps from kernel mode",
276                                       regs);
277                 return;
278         }
279 
280         fsr = fpt->thread.fsr;
281         code = FPE_FLTUNK;
282         if ((fsr & 0x1c000) == (1 << 14)) {
283                 if (fsr & 0x10)
284                         code = FPE_FLTINV;
285                 else if (fsr & 0x08)
286                         code = FPE_FLTOVF;
287                 else if (fsr & 0x04)
288                         code = FPE_FLTUND;
289                 else if (fsr & 0x02)
290                         code = FPE_FLTDIV;
291                 else if (fsr & 0x01)
292                         code = FPE_FLTRES;
293         }
294         send_sig_fault(SIGFPE, code, (void __user *)pc, 0, fpt);
295 #ifndef CONFIG_SMP
296         last_task_used_math = NULL;
297 #endif
298         regs->psr &= ~PSR_EF;
299         if(calls > 0)
300                 calls=0;
301 }
302 
303 void handle_tag_overflow(struct pt_regs *regs, unsigned long pc, unsigned long npc,
304                          unsigned long psr)
305 {
306         if(psr & PSR_PS)
307                 die_if_kernel("Penguin overflow trap from kernel mode", regs);
308         send_sig_fault(SIGEMT, EMT_TAGOVF, (void __user *)pc, 0, current);
309 }
310 
311 void handle_watchpoint(struct pt_regs *regs, unsigned long pc, unsigned long npc,
312                        unsigned long psr)
313 {
314 #ifdef TRAP_DEBUG
315         printk("Watchpoint detected at PC %08lx NPC %08lx PSR %08lx\n",
316                pc, npc, psr);
317 #endif
318         if(psr & PSR_PS)
319                 panic("Tell me what a watchpoint trap is, and I'll then deal "
320                       "with such a beast...");
321 }
322 
323 void handle_reg_access(struct pt_regs *regs, unsigned long pc, unsigned long npc,
324                        unsigned long psr)
325 {
326 #ifdef TRAP_DEBUG
327         printk("Register Access Exception at PC %08lx NPC %08lx PSR %08lx\n",
328                pc, npc, psr);
329 #endif
330         force_sig_fault(SIGBUS, BUS_OBJERR, (void __user *)pc, 0, current);
331 }
332 
333 void handle_cp_disabled(struct pt_regs *regs, unsigned long pc, unsigned long npc,
334                         unsigned long psr)
335 {
336         send_sig_fault(SIGILL, ILL_COPROC, (void __user *)pc, 0, current);
337 }
338 
339 void handle_cp_exception(struct pt_regs *regs, unsigned long pc, unsigned long npc,
340                          unsigned long psr)
341 {
342 #ifdef TRAP_DEBUG
343         printk("Co-Processor Exception at PC %08lx NPC %08lx PSR %08lx\n",
344                pc, npc, psr);
345 #endif
346         send_sig_fault(SIGILL, ILL_COPROC, (void __user *)pc, 0, current);
347 }
348 
349 void handle_hw_divzero(struct pt_regs *regs, unsigned long pc, unsigned long npc,
350                        unsigned long psr)
351 {
352         send_sig_fault(SIGFPE, FPE_INTDIV, (void __user *)pc, 0, current);
353 }
354 
355 #ifdef CONFIG_DEBUG_BUGVERBOSE
356 void do_BUG(const char *file, int line)
357 {
358         // bust_spinlocks(1);   XXX Not in our original BUG()
359         printk("kernel BUG at %s:%d!\n", file, line);
360 }
361 EXPORT_SYMBOL(do_BUG);
362 #endif
363 
364 /* Since we have our mappings set up, on multiprocessors we can spin them
365  * up here so that timer interrupts work during initialization.
366  */
367 
368 void trap_init(void)
369 {
370         extern void thread_info_offsets_are_bolixed_pete(void);
371 
372         /* Force linker to barf if mismatched */
373         if (TI_UWINMASK    != offsetof(struct thread_info, uwinmask) ||
374             TI_TASK        != offsetof(struct thread_info, task) ||
375             TI_FLAGS       != offsetof(struct thread_info, flags) ||
376             TI_CPU         != offsetof(struct thread_info, cpu) ||
377             TI_PREEMPT     != offsetof(struct thread_info, preempt_count) ||
378             TI_SOFTIRQ     != offsetof(struct thread_info, softirq_count) ||
379             TI_HARDIRQ     != offsetof(struct thread_info, hardirq_count) ||
380             TI_KSP         != offsetof(struct thread_info, ksp) ||
381             TI_KPC         != offsetof(struct thread_info, kpc) ||
382             TI_KPSR        != offsetof(struct thread_info, kpsr) ||
383             TI_KWIM        != offsetof(struct thread_info, kwim) ||
384             TI_REG_WINDOW  != offsetof(struct thread_info, reg_window) ||
385             TI_RWIN_SPTRS  != offsetof(struct thread_info, rwbuf_stkptrs) ||
386             TI_W_SAVED     != offsetof(struct thread_info, w_saved))
387                 thread_info_offsets_are_bolixed_pete();
388 
389         /* Attach to the address space of init_task. */
390         mmgrab(&init_mm);
391         current->active_mm = &init_mm;
392 
393         /* NOTE: Other cpus have this done as they are started
394          *       up on SMP.
395          */
396 }
397 

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