Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
88278ca2 | 2 | /* |
1da177e4 LT |
3 | * arch/sparc/kernel/traps.c |
4 | * | |
4fe3ebec | 5 | * Copyright 1995, 2008 David S. Miller (davem@davemloft.net) |
1da177e4 LT |
6 | * Copyright 2000 Jakub Jelinek (jakub@redhat.com) |
7 | */ | |
8 | ||
9 | /* | |
10 | * I hate traps on the sparc, grrr... | |
11 | */ | |
12 | ||
68e21be2 | 13 | #include <linux/sched/mm.h> |
b17b0153 | 14 | #include <linux/sched/debug.h> |
589ee628 | 15 | #include <linux/mm_types.h> |
1da177e4 | 16 | #include <linux/kernel.h> |
1da177e4 LT |
17 | #include <linux/signal.h> |
18 | #include <linux/smp.h> | |
1eeb66a1 | 19 | #include <linux/kdebug.h> |
7b64db60 | 20 | #include <linux/export.h> |
1da177e4 LT |
21 | |
22 | #include <asm/delay.h> | |
1da177e4 LT |
23 | #include <asm/ptrace.h> |
24 | #include <asm/oplib.h> | |
25 | #include <asm/page.h> | |
26 | #include <asm/pgtable.h> | |
1da177e4 LT |
27 | #include <asm/unistd.h> |
28 | #include <asm/traps.h> | |
29 | ||
8d74e32a SR |
30 | #include "entry.h" |
31 | #include "kernel.h" | |
1da177e4 | 32 | |
8d74e32a | 33 | /* #define TRAP_DEBUG */ |
1da177e4 | 34 | |
c61c65cd | 35 | static void instruction_dump(unsigned long *pc) |
1da177e4 LT |
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 | ||
fcd0196b | 50 | void __noreturn die_if_kernel(char *str, struct pt_regs *regs) |
1da177e4 LT |
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 | ||
19c5870c | 62 | printk("%s(%d): %s [#%d]\n", current->comm, task_pid_nr(current), str, ++die_counter); |
1da177e4 | 63 | show_regs(regs); |
373d4d09 | 64 | add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE); |
1da177e4 LT |
65 | |
66 | __SAVE; __SAVE; __SAVE; __SAVE; | |
67 | __SAVE; __SAVE; __SAVE; __SAVE; | |
68 | __RESTORE; __RESTORE; __RESTORE; __RESTORE; | |
69 | __RESTORE; __RESTORE; __RESTORE; __RESTORE; | |
70 | ||
71 | { | |
4d7b92ad | 72 | struct reg_window32 *rw = (struct reg_window32 *)regs->u_regs[UREG_FP]; |
1da177e4 LT |
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)) { | |
4fe3ebec DM |
82 | printk("Caller[%08lx]: %pS\n", rw->ins[7], |
83 | (void *) rw->ins[7]); | |
4d7b92ad | 84 | rw = (struct reg_window32 *)rw->ins[6]; |
1da177e4 LT |
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 | ||
3eb0f519 | 107 | clear_siginfo(&info); |
1da177e4 LT |
108 | info.si_signo = SIGILL; |
109 | info.si_errno = 0; | |
110 | info.si_code = ILL_ILLTRP; | |
111 | info.si_addr = (void __user *)regs->pc; | |
112 | info.si_trapno = type - 0x80; | |
113 | force_sig_info(SIGILL, &info, current); | |
114 | } | |
115 | ||
116 | void do_illegal_instruction(struct pt_regs *regs, unsigned long pc, unsigned long npc, | |
117 | unsigned long psr) | |
118 | { | |
1da177e4 LT |
119 | if(psr & PSR_PS) |
120 | die_if_kernel("Kernel illegal instruction", regs); | |
121 | #ifdef TRAP_DEBUG | |
122 | printk("Ill instr. at pc=%08lx instruction is %08lx\n", | |
123 | regs->pc, *(unsigned long *)regs->pc); | |
124 | #endif | |
1da177e4 | 125 | |
0e3d9f1e | 126 | send_sig_fault(SIGILL, ILL_ILLOPC, (void __user *)pc, 0, current); |
1da177e4 LT |
127 | } |
128 | ||
129 | void do_priv_instruction(struct pt_regs *regs, unsigned long pc, unsigned long npc, | |
130 | unsigned long psr) | |
131 | { | |
1da177e4 LT |
132 | if(psr & PSR_PS) |
133 | die_if_kernel("Penguin instruction from Penguin mode??!?!", regs); | |
0e3d9f1e | 134 | send_sig_fault(SIGILL, ILL_PRVOPC, (void __user *)pc, 0, current); |
1da177e4 LT |
135 | } |
136 | ||
137 | /* XXX User may want to be allowed to do this. XXX */ | |
138 | ||
139 | void do_memaccess_unaligned(struct pt_regs *regs, unsigned long pc, unsigned long npc, | |
140 | unsigned long psr) | |
141 | { | |
1da177e4 LT |
142 | if(regs->psr & PSR_PS) { |
143 | printk("KERNEL MNA at pc %08lx npc %08lx called by %08lx\n", pc, npc, | |
144 | regs->u_regs[UREG_RETPC]); | |
145 | die_if_kernel("BOGUS", regs); | |
146 | /* die_if_kernel("Kernel MNA access", regs); */ | |
147 | } | |
148 | #if 0 | |
149 | show_regs (regs); | |
150 | instruction_dump ((unsigned long *) regs->pc); | |
151 | printk ("do_MNA!\n"); | |
152 | #endif | |
0e3d9f1e EB |
153 | send_sig_fault(SIGBUS, BUS_ADRALN, |
154 | /* FIXME: Should dig out mna address */ (void *)0, | |
155 | 0, current); | |
1da177e4 LT |
156 | } |
157 | ||
1da177e4 LT |
158 | static unsigned long init_fsr = 0x0UL; |
159 | static unsigned long init_fregs[32] __attribute__ ((aligned (8))) = | |
160 | { ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, | |
161 | ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, | |
162 | ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, | |
163 | ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL }; | |
164 | ||
165 | void do_fpd_trap(struct pt_regs *regs, unsigned long pc, unsigned long npc, | |
166 | unsigned long psr) | |
167 | { | |
168 | /* Sanity check... */ | |
169 | if(psr & PSR_PS) | |
170 | die_if_kernel("Kernel gets FloatingPenguinUnit disabled trap", regs); | |
171 | ||
172 | put_psr(get_psr() | PSR_EF); /* Allow FPU ops. */ | |
173 | regs->psr |= PSR_EF; | |
174 | #ifndef CONFIG_SMP | |
175 | if(last_task_used_math == current) | |
176 | return; | |
177 | if(last_task_used_math) { | |
178 | /* Other processes fpu state, save away */ | |
179 | struct task_struct *fptask = last_task_used_math; | |
180 | fpsave(&fptask->thread.float_regs[0], &fptask->thread.fsr, | |
181 | &fptask->thread.fpqueue[0], &fptask->thread.fpqdepth); | |
182 | } | |
183 | last_task_used_math = current; | |
184 | if(used_math()) { | |
185 | fpload(¤t->thread.float_regs[0], ¤t->thread.fsr); | |
186 | } else { | |
187 | /* Set initial sane state. */ | |
188 | fpload(&init_fregs[0], &init_fsr); | |
189 | set_used_math(); | |
190 | } | |
191 | #else | |
192 | if(!used_math()) { | |
193 | fpload(&init_fregs[0], &init_fsr); | |
194 | set_used_math(); | |
195 | } else { | |
196 | fpload(¤t->thread.float_regs[0], ¤t->thread.fsr); | |
197 | } | |
54f565ea | 198 | set_thread_flag(TIF_USEDFPU); |
1da177e4 LT |
199 | #endif |
200 | } | |
201 | ||
202 | static unsigned long fake_regs[32] __attribute__ ((aligned (8))); | |
203 | static unsigned long fake_fsr; | |
204 | static unsigned long fake_queue[32] __attribute__ ((aligned (8))); | |
205 | static unsigned long fake_depth; | |
206 | ||
1da177e4 LT |
207 | void do_fpe_trap(struct pt_regs *regs, unsigned long pc, unsigned long npc, |
208 | unsigned long psr) | |
209 | { | |
210 | static int calls; | |
1da177e4 LT |
211 | unsigned long fsr; |
212 | int ret = 0; | |
0e3d9f1e | 213 | int code; |
1da177e4 LT |
214 | #ifndef CONFIG_SMP |
215 | struct task_struct *fpt = last_task_used_math; | |
216 | #else | |
217 | struct task_struct *fpt = current; | |
218 | #endif | |
219 | put_psr(get_psr() | PSR_EF); | |
220 | /* If nobody owns the fpu right now, just clear the | |
221 | * error into our fake static buffer and hope it don't | |
222 | * happen again. Thank you crashme... | |
223 | */ | |
224 | #ifndef CONFIG_SMP | |
225 | if(!fpt) { | |
226 | #else | |
54f565ea | 227 | if (!test_tsk_thread_flag(fpt, TIF_USEDFPU)) { |
1da177e4 LT |
228 | #endif |
229 | fpsave(&fake_regs[0], &fake_fsr, &fake_queue[0], &fake_depth); | |
230 | regs->psr &= ~PSR_EF; | |
231 | return; | |
232 | } | |
233 | fpsave(&fpt->thread.float_regs[0], &fpt->thread.fsr, | |
234 | &fpt->thread.fpqueue[0], &fpt->thread.fpqdepth); | |
235 | #ifdef DEBUG_FPU | |
236 | printk("Hmm, FP exception, fsr was %016lx\n", fpt->thread.fsr); | |
237 | #endif | |
238 | ||
239 | switch ((fpt->thread.fsr & 0x1c000)) { | |
240 | /* switch on the contents of the ftt [floating point trap type] field */ | |
241 | #ifdef DEBUG_FPU | |
242 | case (1 << 14): | |
243 | printk("IEEE_754_exception\n"); | |
244 | break; | |
245 | #endif | |
246 | case (2 << 14): /* unfinished_FPop (underflow & co) */ | |
247 | case (3 << 14): /* unimplemented_FPop (quad stuff, maybe sqrt) */ | |
248 | ret = do_mathemu(regs, fpt); | |
249 | break; | |
250 | #ifdef DEBUG_FPU | |
251 | case (4 << 14): | |
252 | printk("sequence_error (OS bug...)\n"); | |
253 | break; | |
254 | case (5 << 14): | |
255 | printk("hardware_error (uhoh!)\n"); | |
256 | break; | |
257 | case (6 << 14): | |
258 | printk("invalid_fp_register (user error)\n"); | |
259 | break; | |
260 | #endif /* DEBUG_FPU */ | |
261 | } | |
262 | /* If we successfully emulated the FPop, we pretend the trap never happened :-> */ | |
263 | if (ret) { | |
264 | fpload(¤t->thread.float_regs[0], ¤t->thread.fsr); | |
265 | return; | |
266 | } | |
267 | /* nope, better SIGFPE the offending process... */ | |
268 | ||
269 | #ifdef CONFIG_SMP | |
54f565ea | 270 | clear_tsk_thread_flag(fpt, TIF_USEDFPU); |
1da177e4 LT |
271 | #endif |
272 | if(psr & PSR_PS) { | |
273 | /* The first fsr store/load we tried trapped, | |
274 | * the second one will not (we hope). | |
275 | */ | |
276 | printk("WARNING: FPU exception from kernel mode. at pc=%08lx\n", | |
277 | regs->pc); | |
278 | regs->pc = regs->npc; | |
279 | regs->npc += 4; | |
280 | calls++; | |
281 | if(calls > 2) | |
282 | die_if_kernel("Too many Penguin-FPU traps from kernel mode", | |
283 | regs); | |
284 | return; | |
285 | } | |
286 | ||
287 | fsr = fpt->thread.fsr; | |
0e3d9f1e | 288 | code = FPE_FLTUNK; |
1da177e4 LT |
289 | if ((fsr & 0x1c000) == (1 << 14)) { |
290 | if (fsr & 0x10) | |
0e3d9f1e | 291 | code = FPE_FLTINV; |
1da177e4 | 292 | else if (fsr & 0x08) |
0e3d9f1e | 293 | code = FPE_FLTOVF; |
1da177e4 | 294 | else if (fsr & 0x04) |
0e3d9f1e | 295 | code = FPE_FLTUND; |
1da177e4 | 296 | else if (fsr & 0x02) |
0e3d9f1e | 297 | code = FPE_FLTDIV; |
1da177e4 | 298 | else if (fsr & 0x01) |
0e3d9f1e | 299 | code = FPE_FLTRES; |
1da177e4 | 300 | } |
0e3d9f1e | 301 | send_sig_fault(SIGFPE, code, (void __user *)pc, 0, fpt); |
1da177e4 LT |
302 | #ifndef CONFIG_SMP |
303 | last_task_used_math = NULL; | |
304 | #endif | |
305 | regs->psr &= ~PSR_EF; | |
306 | if(calls > 0) | |
307 | calls=0; | |
308 | } | |
309 | ||
310 | void handle_tag_overflow(struct pt_regs *regs, unsigned long pc, unsigned long npc, | |
311 | unsigned long psr) | |
312 | { | |
1da177e4 LT |
313 | if(psr & PSR_PS) |
314 | die_if_kernel("Penguin overflow trap from kernel mode", regs); | |
0e3d9f1e | 315 | send_sig_fault(SIGEMT, EMT_TAGOVF, (void __user *)pc, 0, current); |
1da177e4 LT |
316 | } |
317 | ||
318 | void handle_watchpoint(struct pt_regs *regs, unsigned long pc, unsigned long npc, | |
319 | unsigned long psr) | |
320 | { | |
321 | #ifdef TRAP_DEBUG | |
322 | printk("Watchpoint detected at PC %08lx NPC %08lx PSR %08lx\n", | |
323 | pc, npc, psr); | |
324 | #endif | |
325 | if(psr & PSR_PS) | |
326 | panic("Tell me what a watchpoint trap is, and I'll then deal " | |
327 | "with such a beast..."); | |
328 | } | |
329 | ||
330 | void handle_reg_access(struct pt_regs *regs, unsigned long pc, unsigned long npc, | |
331 | unsigned long psr) | |
332 | { | |
333 | siginfo_t info; | |
334 | ||
335 | #ifdef TRAP_DEBUG | |
336 | printk("Register Access Exception at PC %08lx NPC %08lx PSR %08lx\n", | |
337 | pc, npc, psr); | |
338 | #endif | |
3eb0f519 | 339 | clear_siginfo(&info); |
1da177e4 LT |
340 | info.si_signo = SIGBUS; |
341 | info.si_errno = 0; | |
342 | info.si_code = BUS_OBJERR; | |
343 | info.si_addr = (void __user *)pc; | |
344 | info.si_trapno = 0; | |
345 | force_sig_info(SIGBUS, &info, current); | |
346 | } | |
347 | ||
348 | void handle_cp_disabled(struct pt_regs *regs, unsigned long pc, unsigned long npc, | |
349 | unsigned long psr) | |
350 | { | |
0e3d9f1e | 351 | send_sig_fault(SIGILL, ILL_COPROC, (void __user *)pc, 0, current); |
1da177e4 LT |
352 | } |
353 | ||
354 | void handle_cp_exception(struct pt_regs *regs, unsigned long pc, unsigned long npc, | |
355 | unsigned long psr) | |
356 | { | |
1da177e4 LT |
357 | #ifdef TRAP_DEBUG |
358 | printk("Co-Processor Exception at PC %08lx NPC %08lx PSR %08lx\n", | |
359 | pc, npc, psr); | |
360 | #endif | |
0e3d9f1e | 361 | send_sig_fault(SIGILL, ILL_COPROC, (void __user *)pc, 0, current); |
1da177e4 LT |
362 | } |
363 | ||
364 | void handle_hw_divzero(struct pt_regs *regs, unsigned long pc, unsigned long npc, | |
365 | unsigned long psr) | |
366 | { | |
0e3d9f1e | 367 | send_sig_fault(SIGFPE, FPE_INTDIV, (void __user *)pc, 0, current); |
1da177e4 LT |
368 | } |
369 | ||
370 | #ifdef CONFIG_DEBUG_BUGVERBOSE | |
371 | void do_BUG(const char *file, int line) | |
372 | { | |
373 | // bust_spinlocks(1); XXX Not in our original BUG() | |
374 | printk("kernel BUG at %s:%d!\n", file, line); | |
375 | } | |
6943f3da | 376 | EXPORT_SYMBOL(do_BUG); |
1da177e4 LT |
377 | #endif |
378 | ||
379 | /* Since we have our mappings set up, on multiprocessors we can spin them | |
380 | * up here so that timer interrupts work during initialization. | |
381 | */ | |
382 | ||
1da177e4 LT |
383 | void trap_init(void) |
384 | { | |
385 | extern void thread_info_offsets_are_bolixed_pete(void); | |
386 | ||
387 | /* Force linker to barf if mismatched */ | |
388 | if (TI_UWINMASK != offsetof(struct thread_info, uwinmask) || | |
389 | TI_TASK != offsetof(struct thread_info, task) || | |
1da177e4 LT |
390 | TI_FLAGS != offsetof(struct thread_info, flags) || |
391 | TI_CPU != offsetof(struct thread_info, cpu) || | |
392 | TI_PREEMPT != offsetof(struct thread_info, preempt_count) || | |
393 | TI_SOFTIRQ != offsetof(struct thread_info, softirq_count) || | |
394 | TI_HARDIRQ != offsetof(struct thread_info, hardirq_count) || | |
395 | TI_KSP != offsetof(struct thread_info, ksp) || | |
396 | TI_KPC != offsetof(struct thread_info, kpc) || | |
397 | TI_KPSR != offsetof(struct thread_info, kpsr) || | |
398 | TI_KWIM != offsetof(struct thread_info, kwim) || | |
399 | TI_REG_WINDOW != offsetof(struct thread_info, reg_window) || | |
400 | TI_RWIN_SPTRS != offsetof(struct thread_info, rwbuf_stkptrs) || | |
401 | TI_W_SAVED != offsetof(struct thread_info, w_saved)) | |
402 | thread_info_offsets_are_bolixed_pete(); | |
403 | ||
404 | /* Attach to the address space of init_task. */ | |
f1f10076 | 405 | mmgrab(&init_mm); |
1da177e4 LT |
406 | current->active_mm = &init_mm; |
407 | ||
408 | /* NOTE: Other cpus have this done as they are started | |
409 | * up on SMP. | |
410 | */ | |
411 | } |