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