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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
32static 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
47void 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);
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
91void 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
112void 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
132void 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
149void 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
173static unsigned long init_fsr = 0x0UL;
174static 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
180void 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(¤t->thread.float_regs[0], ¤t->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(¤t->thread.float_regs[0], ¤t->thread.fsr);
212 }
213 set_thread_flag(TIF_USEDFPU);
214#endif
215}
216
217static unsigned long fake_regs[32] __attribute__ ((aligned (8)));
218static unsigned long fake_fsr;
219static unsigned long fake_queue[32] __attribute__ ((aligned (8)));
220static unsigned long fake_depth;
221
222extern int do_mathemu(struct pt_regs *, struct task_struct *);
223
224void do_fpe_trap(struct pt_regs *regs, unsigned long pc, unsigned long npc,
225 unsigned long psr)
226{
227 static int calls;
228 siginfo_t info;
229 unsigned long fsr;
230 int ret = 0;
231#ifndef CONFIG_SMP
232 struct task_struct *fpt = last_task_used_math;
233#else
234 struct task_struct *fpt = current;
235#endif
236 put_psr(get_psr() | PSR_EF);
237 /* If nobody owns the fpu right now, just clear the
238 * error into our fake static buffer and hope it don't
239 * happen again. Thank you crashme...
240 */
241#ifndef CONFIG_SMP
242 if(!fpt) {
243#else
244 if (!test_tsk_thread_flag(fpt, TIF_USEDFPU)) {
245#endif
246 fpsave(&fake_regs[0], &fake_fsr, &fake_queue[0], &fake_depth);
247 regs->psr &= ~PSR_EF;
248 return;
249 }
250 fpsave(&fpt->thread.float_regs[0], &fpt->thread.fsr,
251 &fpt->thread.fpqueue[0], &fpt->thread.fpqdepth);
252#ifdef DEBUG_FPU
253 printk("Hmm, FP exception, fsr was %016lx\n", fpt->thread.fsr);
254#endif
255
256 switch ((fpt->thread.fsr & 0x1c000)) {
257 /* switch on the contents of the ftt [floating point trap type] field */
258#ifdef DEBUG_FPU
259 case (1 << 14):
260 printk("IEEE_754_exception\n");
261 break;
262#endif
263 case (2 << 14): /* unfinished_FPop (underflow & co) */
264 case (3 << 14): /* unimplemented_FPop (quad stuff, maybe sqrt) */
265 ret = do_mathemu(regs, fpt);
266 break;
267#ifdef DEBUG_FPU
268 case (4 << 14):
269 printk("sequence_error (OS bug...)\n");
270 break;
271 case (5 << 14):
272 printk("hardware_error (uhoh!)\n");
273 break;
274 case (6 << 14):
275 printk("invalid_fp_register (user error)\n");
276 break;
277#endif /* DEBUG_FPU */
278 }
279 /* If we successfully emulated the FPop, we pretend the trap never happened :-> */
280 if (ret) {
281 fpload(¤t->thread.float_regs[0], ¤t->thread.fsr);
282 return;
283 }
284 /* nope, better SIGFPE the offending process... */
285
286#ifdef CONFIG_SMP
287 clear_tsk_thread_flag(fpt, TIF_USEDFPU);
288#endif
289 if(psr & PSR_PS) {
290 /* The first fsr store/load we tried trapped,
291 * the second one will not (we hope).
292 */
293 printk("WARNING: FPU exception from kernel mode. at pc=%08lx\n",
294 regs->pc);
295 regs->pc = regs->npc;
296 regs->npc += 4;
297 calls++;
298 if(calls > 2)
299 die_if_kernel("Too many Penguin-FPU traps from kernel mode",
300 regs);
301 return;
302 }
303
304 fsr = fpt->thread.fsr;
305 info.si_signo = SIGFPE;
306 info.si_errno = 0;
307 info.si_addr = (void __user *)pc;
308 info.si_trapno = 0;
309 info.si_code = __SI_FAULT;
310 if ((fsr & 0x1c000) == (1 << 14)) {
311 if (fsr & 0x10)
312 info.si_code = FPE_FLTINV;
313 else if (fsr & 0x08)
314 info.si_code = FPE_FLTOVF;
315 else if (fsr & 0x04)
316 info.si_code = FPE_FLTUND;
317 else if (fsr & 0x02)
318 info.si_code = FPE_FLTDIV;
319 else if (fsr & 0x01)
320 info.si_code = FPE_FLTRES;
321 }
322 send_sig_info(SIGFPE, &info, fpt);
323#ifndef CONFIG_SMP
324 last_task_used_math = NULL;
325#endif
326 regs->psr &= ~PSR_EF;
327 if(calls > 0)
328 calls=0;
329}
330
331void handle_tag_overflow(struct pt_regs *regs, unsigned long pc, unsigned long npc,
332 unsigned long psr)
333{
334 siginfo_t info;
335
336 if(psr & PSR_PS)
337 die_if_kernel("Penguin overflow trap from kernel mode", regs);
338 info.si_signo = SIGEMT;
339 info.si_errno = 0;
340 info.si_code = EMT_TAGOVF;
341 info.si_addr = (void __user *)pc;
342 info.si_trapno = 0;
343 send_sig_info(SIGEMT, &info, current);
344}
345
346void handle_watchpoint(struct pt_regs *regs, unsigned long pc, unsigned long npc,
347 unsigned long psr)
348{
349#ifdef TRAP_DEBUG
350 printk("Watchpoint detected at PC %08lx NPC %08lx PSR %08lx\n",
351 pc, npc, psr);
352#endif
353 if(psr & PSR_PS)
354 panic("Tell me what a watchpoint trap is, and I'll then deal "
355 "with such a beast...");
356}
357
358void handle_reg_access(struct pt_regs *regs, unsigned long pc, unsigned long npc,
359 unsigned long psr)
360{
361 siginfo_t info;
362
363#ifdef TRAP_DEBUG
364 printk("Register Access Exception at PC %08lx NPC %08lx PSR %08lx\n",
365 pc, npc, psr);
366#endif
367 info.si_signo = SIGBUS;
368 info.si_errno = 0;
369 info.si_code = BUS_OBJERR;
370 info.si_addr = (void __user *)pc;
371 info.si_trapno = 0;
372 force_sig_info(SIGBUS, &info, current);
373}
374
375void handle_cp_disabled(struct pt_regs *regs, unsigned long pc, unsigned long npc,
376 unsigned long psr)
377{
378 siginfo_t info;
379
380 info.si_signo = SIGILL;
381 info.si_errno = 0;
382 info.si_code = ILL_COPROC;
383 info.si_addr = (void __user *)pc;
384 info.si_trapno = 0;
385 send_sig_info(SIGILL, &info, current);
386}
387
388void handle_cp_exception(struct pt_regs *regs, unsigned long pc, unsigned long npc,
389 unsigned long psr)
390{
391 siginfo_t info;
392
393#ifdef TRAP_DEBUG
394 printk("Co-Processor Exception at PC %08lx NPC %08lx PSR %08lx\n",
395 pc, npc, psr);
396#endif
397 info.si_signo = SIGILL;
398 info.si_errno = 0;
399 info.si_code = ILL_COPROC;
400 info.si_addr = (void __user *)pc;
401 info.si_trapno = 0;
402 send_sig_info(SIGILL, &info, current);
403}
404
405void handle_hw_divzero(struct pt_regs *regs, unsigned long pc, unsigned long npc,
406 unsigned long psr)
407{
408 siginfo_t info;
409
410 info.si_signo = SIGFPE;
411 info.si_errno = 0;
412 info.si_code = FPE_INTDIV;
413 info.si_addr = (void __user *)pc;
414 info.si_trapno = 0;
415 send_sig_info(SIGFPE, &info, current);
416}
417
418#ifdef CONFIG_DEBUG_BUGVERBOSE
419void do_BUG(const char *file, int line)
420{
421 // bust_spinlocks(1); XXX Not in our original BUG()
422 printk("kernel BUG at %s:%d!\n", file, line);
423}
424EXPORT_SYMBOL(do_BUG);
425#endif
426
427/* Since we have our mappings set up, on multiprocessors we can spin them
428 * up here so that timer interrupts work during initialization.
429 */
430
431void trap_init(void)
432{
433 extern void thread_info_offsets_are_bolixed_pete(void);
434
435 /* Force linker to barf if mismatched */
436 if (TI_UWINMASK != offsetof(struct thread_info, uwinmask) ||
437 TI_TASK != offsetof(struct thread_info, task) ||
438 TI_EXECDOMAIN != offsetof(struct thread_info, exec_domain) ||
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 atomic_inc(&init_mm.mm_count);
455 current->active_mm = &init_mm;
456
457 /* NOTE: Other cpus have this done as they are started
458 * up on SMP.
459 */
460}
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
18#include <asm/delay.h>
19#include <asm/system.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
32static 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
47void 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);
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
91void 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
112void 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 if (!do_user_muldiv (regs, pc))
124 return;
125
126 info.si_signo = SIGILL;
127 info.si_errno = 0;
128 info.si_code = ILL_ILLOPC;
129 info.si_addr = (void __user *)pc;
130 info.si_trapno = 0;
131 send_sig_info(SIGILL, &info, current);
132}
133
134void do_priv_instruction(struct pt_regs *regs, unsigned long pc, unsigned long npc,
135 unsigned long psr)
136{
137 siginfo_t info;
138
139 if(psr & PSR_PS)
140 die_if_kernel("Penguin instruction from Penguin mode??!?!", regs);
141 info.si_signo = SIGILL;
142 info.si_errno = 0;
143 info.si_code = ILL_PRVOPC;
144 info.si_addr = (void __user *)pc;
145 info.si_trapno = 0;
146 send_sig_info(SIGILL, &info, current);
147}
148
149/* XXX User may want to be allowed to do this. XXX */
150
151void do_memaccess_unaligned(struct pt_regs *regs, unsigned long pc, unsigned long npc,
152 unsigned long psr)
153{
154 siginfo_t info;
155
156 if(regs->psr & PSR_PS) {
157 printk("KERNEL MNA at pc %08lx npc %08lx called by %08lx\n", pc, npc,
158 regs->u_regs[UREG_RETPC]);
159 die_if_kernel("BOGUS", regs);
160 /* die_if_kernel("Kernel MNA access", regs); */
161 }
162#if 0
163 show_regs (regs);
164 instruction_dump ((unsigned long *) regs->pc);
165 printk ("do_MNA!\n");
166#endif
167 info.si_signo = SIGBUS;
168 info.si_errno = 0;
169 info.si_code = BUS_ADRALN;
170 info.si_addr = /* FIXME: Should dig out mna address */ (void *)0;
171 info.si_trapno = 0;
172 send_sig_info(SIGBUS, &info, current);
173}
174
175static unsigned long init_fsr = 0x0UL;
176static unsigned long init_fregs[32] __attribute__ ((aligned (8))) =
177 { ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL,
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
182void do_fpd_trap(struct pt_regs *regs, unsigned long pc, unsigned long npc,
183 unsigned long psr)
184{
185 /* Sanity check... */
186 if(psr & PSR_PS)
187 die_if_kernel("Kernel gets FloatingPenguinUnit disabled trap", regs);
188
189 put_psr(get_psr() | PSR_EF); /* Allow FPU ops. */
190 regs->psr |= PSR_EF;
191#ifndef CONFIG_SMP
192 if(last_task_used_math == current)
193 return;
194 if(last_task_used_math) {
195 /* Other processes fpu state, save away */
196 struct task_struct *fptask = last_task_used_math;
197 fpsave(&fptask->thread.float_regs[0], &fptask->thread.fsr,
198 &fptask->thread.fpqueue[0], &fptask->thread.fpqdepth);
199 }
200 last_task_used_math = current;
201 if(used_math()) {
202 fpload(¤t->thread.float_regs[0], ¤t->thread.fsr);
203 } else {
204 /* Set initial sane state. */
205 fpload(&init_fregs[0], &init_fsr);
206 set_used_math();
207 }
208#else
209 if(!used_math()) {
210 fpload(&init_fregs[0], &init_fsr);
211 set_used_math();
212 } else {
213 fpload(¤t->thread.float_regs[0], ¤t->thread.fsr);
214 }
215 set_thread_flag(TIF_USEDFPU);
216#endif
217}
218
219static unsigned long fake_regs[32] __attribute__ ((aligned (8)));
220static unsigned long fake_fsr;
221static unsigned long fake_queue[32] __attribute__ ((aligned (8)));
222static unsigned long fake_depth;
223
224extern int do_mathemu(struct pt_regs *, struct task_struct *);
225
226void do_fpe_trap(struct pt_regs *regs, unsigned long pc, unsigned long npc,
227 unsigned long psr)
228{
229 static int calls;
230 siginfo_t info;
231 unsigned long fsr;
232 int ret = 0;
233#ifndef CONFIG_SMP
234 struct task_struct *fpt = last_task_used_math;
235#else
236 struct task_struct *fpt = current;
237#endif
238 put_psr(get_psr() | PSR_EF);
239 /* If nobody owns the fpu right now, just clear the
240 * error into our fake static buffer and hope it don't
241 * happen again. Thank you crashme...
242 */
243#ifndef CONFIG_SMP
244 if(!fpt) {
245#else
246 if (!test_tsk_thread_flag(fpt, TIF_USEDFPU)) {
247#endif
248 fpsave(&fake_regs[0], &fake_fsr, &fake_queue[0], &fake_depth);
249 regs->psr &= ~PSR_EF;
250 return;
251 }
252 fpsave(&fpt->thread.float_regs[0], &fpt->thread.fsr,
253 &fpt->thread.fpqueue[0], &fpt->thread.fpqdepth);
254#ifdef DEBUG_FPU
255 printk("Hmm, FP exception, fsr was %016lx\n", fpt->thread.fsr);
256#endif
257
258 switch ((fpt->thread.fsr & 0x1c000)) {
259 /* switch on the contents of the ftt [floating point trap type] field */
260#ifdef DEBUG_FPU
261 case (1 << 14):
262 printk("IEEE_754_exception\n");
263 break;
264#endif
265 case (2 << 14): /* unfinished_FPop (underflow & co) */
266 case (3 << 14): /* unimplemented_FPop (quad stuff, maybe sqrt) */
267 ret = do_mathemu(regs, fpt);
268 break;
269#ifdef DEBUG_FPU
270 case (4 << 14):
271 printk("sequence_error (OS bug...)\n");
272 break;
273 case (5 << 14):
274 printk("hardware_error (uhoh!)\n");
275 break;
276 case (6 << 14):
277 printk("invalid_fp_register (user error)\n");
278 break;
279#endif /* DEBUG_FPU */
280 }
281 /* If we successfully emulated the FPop, we pretend the trap never happened :-> */
282 if (ret) {
283 fpload(¤t->thread.float_regs[0], ¤t->thread.fsr);
284 return;
285 }
286 /* nope, better SIGFPE the offending process... */
287
288#ifdef CONFIG_SMP
289 clear_tsk_thread_flag(fpt, TIF_USEDFPU);
290#endif
291 if(psr & PSR_PS) {
292 /* The first fsr store/load we tried trapped,
293 * the second one will not (we hope).
294 */
295 printk("WARNING: FPU exception from kernel mode. at pc=%08lx\n",
296 regs->pc);
297 regs->pc = regs->npc;
298 regs->npc += 4;
299 calls++;
300 if(calls > 2)
301 die_if_kernel("Too many Penguin-FPU traps from kernel mode",
302 regs);
303 return;
304 }
305
306 fsr = fpt->thread.fsr;
307 info.si_signo = SIGFPE;
308 info.si_errno = 0;
309 info.si_addr = (void __user *)pc;
310 info.si_trapno = 0;
311 info.si_code = __SI_FAULT;
312 if ((fsr & 0x1c000) == (1 << 14)) {
313 if (fsr & 0x10)
314 info.si_code = FPE_FLTINV;
315 else if (fsr & 0x08)
316 info.si_code = FPE_FLTOVF;
317 else if (fsr & 0x04)
318 info.si_code = FPE_FLTUND;
319 else if (fsr & 0x02)
320 info.si_code = FPE_FLTDIV;
321 else if (fsr & 0x01)
322 info.si_code = FPE_FLTRES;
323 }
324 send_sig_info(SIGFPE, &info, fpt);
325#ifndef CONFIG_SMP
326 last_task_used_math = NULL;
327#endif
328 regs->psr &= ~PSR_EF;
329 if(calls > 0)
330 calls=0;
331}
332
333void handle_tag_overflow(struct pt_regs *regs, unsigned long pc, unsigned long npc,
334 unsigned long psr)
335{
336 siginfo_t info;
337
338 if(psr & PSR_PS)
339 die_if_kernel("Penguin overflow trap from kernel mode", regs);
340 info.si_signo = SIGEMT;
341 info.si_errno = 0;
342 info.si_code = EMT_TAGOVF;
343 info.si_addr = (void __user *)pc;
344 info.si_trapno = 0;
345 send_sig_info(SIGEMT, &info, current);
346}
347
348void handle_watchpoint(struct pt_regs *regs, unsigned long pc, unsigned long npc,
349 unsigned long psr)
350{
351#ifdef TRAP_DEBUG
352 printk("Watchpoint detected at PC %08lx NPC %08lx PSR %08lx\n",
353 pc, npc, psr);
354#endif
355 if(psr & PSR_PS)
356 panic("Tell me what a watchpoint trap is, and I'll then deal "
357 "with such a beast...");
358}
359
360void handle_reg_access(struct pt_regs *regs, unsigned long pc, unsigned long npc,
361 unsigned long psr)
362{
363 siginfo_t info;
364
365#ifdef TRAP_DEBUG
366 printk("Register Access Exception at PC %08lx NPC %08lx PSR %08lx\n",
367 pc, npc, psr);
368#endif
369 info.si_signo = SIGBUS;
370 info.si_errno = 0;
371 info.si_code = BUS_OBJERR;
372 info.si_addr = (void __user *)pc;
373 info.si_trapno = 0;
374 force_sig_info(SIGBUS, &info, current);
375}
376
377void handle_cp_disabled(struct pt_regs *regs, unsigned long pc, unsigned long npc,
378 unsigned long psr)
379{
380 siginfo_t info;
381
382 info.si_signo = SIGILL;
383 info.si_errno = 0;
384 info.si_code = ILL_COPROC;
385 info.si_addr = (void __user *)pc;
386 info.si_trapno = 0;
387 send_sig_info(SIGILL, &info, current);
388}
389
390void handle_cp_exception(struct pt_regs *regs, unsigned long pc, unsigned long npc,
391 unsigned long psr)
392{
393 siginfo_t info;
394
395#ifdef TRAP_DEBUG
396 printk("Co-Processor Exception at PC %08lx NPC %08lx PSR %08lx\n",
397 pc, npc, psr);
398#endif
399 info.si_signo = SIGILL;
400 info.si_errno = 0;
401 info.si_code = ILL_COPROC;
402 info.si_addr = (void __user *)pc;
403 info.si_trapno = 0;
404 send_sig_info(SIGILL, &info, current);
405}
406
407void handle_hw_divzero(struct pt_regs *regs, unsigned long pc, unsigned long npc,
408 unsigned long psr)
409{
410 siginfo_t info;
411
412 info.si_signo = SIGFPE;
413 info.si_errno = 0;
414 info.si_code = FPE_INTDIV;
415 info.si_addr = (void __user *)pc;
416 info.si_trapno = 0;
417 send_sig_info(SIGFPE, &info, current);
418}
419
420#ifdef CONFIG_DEBUG_BUGVERBOSE
421void do_BUG(const char *file, int line)
422{
423 // bust_spinlocks(1); XXX Not in our original BUG()
424 printk("kernel BUG at %s:%d!\n", file, line);
425}
426EXPORT_SYMBOL(do_BUG);
427#endif
428
429/* Since we have our mappings set up, on multiprocessors we can spin them
430 * up here so that timer interrupts work during initialization.
431 */
432
433void trap_init(void)
434{
435 extern void thread_info_offsets_are_bolixed_pete(void);
436
437 /* Force linker to barf if mismatched */
438 if (TI_UWINMASK != offsetof(struct thread_info, uwinmask) ||
439 TI_TASK != offsetof(struct thread_info, task) ||
440 TI_EXECDOMAIN != offsetof(struct thread_info, exec_domain) ||
441 TI_FLAGS != offsetof(struct thread_info, flags) ||
442 TI_CPU != offsetof(struct thread_info, cpu) ||
443 TI_PREEMPT != offsetof(struct thread_info, preempt_count) ||
444 TI_SOFTIRQ != offsetof(struct thread_info, softirq_count) ||
445 TI_HARDIRQ != offsetof(struct thread_info, hardirq_count) ||
446 TI_KSP != offsetof(struct thread_info, ksp) ||
447 TI_KPC != offsetof(struct thread_info, kpc) ||
448 TI_KPSR != offsetof(struct thread_info, kpsr) ||
449 TI_KWIM != offsetof(struct thread_info, kwim) ||
450 TI_REG_WINDOW != offsetof(struct thread_info, reg_window) ||
451 TI_RWIN_SPTRS != offsetof(struct thread_info, rwbuf_stkptrs) ||
452 TI_W_SAVED != offsetof(struct thread_info, w_saved))
453 thread_info_offsets_are_bolixed_pete();
454
455 /* Attach to the address space of init_task. */
456 atomic_inc(&init_mm.mm_count);
457 current->active_mm = &init_mm;
458
459 /* NOTE: Other cpus have this done as they are started
460 * up on SMP.
461 */
462}