Loading...
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#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 __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
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
222void 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(¤t->thread.float_regs[0], ¤t->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
329void 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
344void 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
356void 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
373void 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
386void 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
403void 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
417void 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}
422EXPORT_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
429void 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}