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authorStephen Rothwell <sfr@canb.auug.org.au>2005-10-01 04:43:42 -0400
committerStephen Rothwell <sfr@canb.auug.org.au>2005-10-01 04:43:42 -0400
commitdc1c1ca3dcd94c545c5e01d7c06b46824d43f4d0 (patch)
treefa088ac3eae8709dd379deda6f31d5b29197d4c9 /arch/ppc64/kernel
parentd96024c688b59d4d1e60dbb0e226964eb758aa01 (diff)
powerpc: merge idle_power4.S and trapc.s
Use idle_power4.S from ppc64 as we are not going to support 32 bit power4 in the merged tree. Merge ppc64 traps.c into powerpc traps.c: use ppc64 versions of exception routine names (as they don't have StudlyCaps) make all the versions if die() have the same prototype Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Diffstat (limited to 'arch/ppc64/kernel')
-rw-r--r--arch/ppc64/kernel/Makefile8
-rw-r--r--arch/ppc64/kernel/idle_power4.S79
-rw-r--r--arch/ppc64/kernel/traps.c568
3 files changed, 8 insertions, 647 deletions
diff --git a/arch/ppc64/kernel/Makefile b/arch/ppc64/kernel/Makefile
index 16e34de34178..9457fe63d125 100644
--- a/arch/ppc64/kernel/Makefile
+++ b/arch/ppc64/kernel/Makefile
@@ -2,6 +2,8 @@
2# Makefile for the linux ppc64 kernel. 2# Makefile for the linux ppc64 kernel.
3# 3#
4 4
5ifneq ($(CONFIG_PPC_MERGE),y)
6
5EXTRA_CFLAGS += -mno-minimal-toc 7EXTRA_CFLAGS += -mno-minimal-toc
6extra-y := head.o vmlinux.lds 8extra-y := head.o vmlinux.lds
7 9
@@ -77,3 +79,9 @@ endif
77# These are here while we do the architecture merge 79# These are here while we do the architecture merge
78vecemu-y += ../../powerpc/kernel/vecemu.o 80vecemu-y += ../../powerpc/kernel/vecemu.o
79vector-y += ../../powerpc/kernel/vector.o 81vector-y += ../../powerpc/kernel/vector.o
82idle_power4-y += ../../powerpc/kernel/idle_power4.o
83traps-y += ../../powerpc/kernel/traps.o
84
85else
86
87endif
diff --git a/arch/ppc64/kernel/idle_power4.S b/arch/ppc64/kernel/idle_power4.S
deleted file mode 100644
index ca02afe2a795..000000000000
--- a/arch/ppc64/kernel/idle_power4.S
+++ /dev/null
@@ -1,79 +0,0 @@
1/*
2 * This file contains the power_save function for 6xx & 7xxx CPUs
3 * rewritten in assembler
4 *
5 * Warning ! This code assumes that if your machine has a 750fx
6 * it will have PLL 1 set to low speed mode (used during NAP/DOZE).
7 * if this is not the case some additional changes will have to
8 * be done to check a runtime var (a bit like powersave-nap)
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 */
15
16#include <linux/config.h>
17#include <linux/threads.h>
18#include <asm/processor.h>
19#include <asm/page.h>
20#include <asm/cputable.h>
21#include <asm/thread_info.h>
22#include <asm/ppc_asm.h>
23#include <asm/asm-offsets.h>
24
25#undef DEBUG
26
27 .text
28
29/*
30 * Here is the power_save_6xx function. This could eventually be
31 * split into several functions & changing the function pointer
32 * depending on the various features.
33 */
34_GLOBAL(power4_idle)
35BEGIN_FTR_SECTION
36 blr
37END_FTR_SECTION_IFCLR(CPU_FTR_CAN_NAP)
38 /* We must dynamically check for the NAP feature as it
39 * can be cleared by CPU init after the fixups are done
40 */
41 LOADBASE(r3,cur_cpu_spec)
42 ld r4,cur_cpu_spec@l(r3)
43 ld r4,CPU_SPEC_FEATURES(r4)
44 andi. r0,r4,CPU_FTR_CAN_NAP
45 beqlr
46 /* Now check if user or arch enabled NAP mode */
47 LOADBASE(r3,powersave_nap)
48 lwz r4,powersave_nap@l(r3)
49 cmpwi 0,r4,0
50 beqlr
51
52 /* Clear MSR:EE */
53 mfmsr r7
54 li r4,0
55 ori r4,r4,MSR_EE
56 andc r0,r7,r4
57 mtmsrd r0
58
59 /* Check current_thread_info()->flags */
60 clrrdi r4,r1,THREAD_SHIFT
61 ld r4,TI_FLAGS(r4)
62 andi. r0,r4,_TIF_NEED_RESCHED
63 beq 1f
64 mtmsrd r7 /* out of line this ? */
65 blr
661:
67 /* Go to NAP now */
68BEGIN_FTR_SECTION
69 DSSALL
70 sync
71END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
72 oris r7,r7,MSR_POW@h
73 sync
74 isync
75 mtmsrd r7
76 isync
77 sync
78 blr
79
diff --git a/arch/ppc64/kernel/traps.c b/arch/ppc64/kernel/traps.c
deleted file mode 100644
index a728c9f0b53f..000000000000
--- a/arch/ppc64/kernel/traps.c
+++ /dev/null
@@ -1,568 +0,0 @@
1/*
2 * linux/arch/ppc64/kernel/traps.c
3 *
4 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 *
11 * Modified by Cort Dougan (cort@cs.nmt.edu)
12 * and Paul Mackerras (paulus@cs.anu.edu.au)
13 */
14
15/*
16 * This file handles the architecture-dependent parts of hardware exceptions
17 */
18
19#include <linux/config.h>
20#include <linux/errno.h>
21#include <linux/sched.h>
22#include <linux/kernel.h>
23#include <linux/mm.h>
24#include <linux/stddef.h>
25#include <linux/unistd.h>
26#include <linux/slab.h>
27#include <linux/user.h>
28#include <linux/a.out.h>
29#include <linux/interrupt.h>
30#include <linux/init.h>
31#include <linux/module.h>
32#include <linux/delay.h>
33#include <linux/kprobes.h>
34#include <asm/kdebug.h>
35
36#include <asm/pgtable.h>
37#include <asm/uaccess.h>
38#include <asm/system.h>
39#include <asm/io.h>
40#include <asm/processor.h>
41#include <asm/ppcdebug.h>
42#include <asm/rtas.h>
43#include <asm/systemcfg.h>
44#include <asm/machdep.h>
45#include <asm/pmc.h>
46
47#ifdef CONFIG_DEBUGGER
48int (*__debugger)(struct pt_regs *regs);
49int (*__debugger_ipi)(struct pt_regs *regs);
50int (*__debugger_bpt)(struct pt_regs *regs);
51int (*__debugger_sstep)(struct pt_regs *regs);
52int (*__debugger_iabr_match)(struct pt_regs *regs);
53int (*__debugger_dabr_match)(struct pt_regs *regs);
54int (*__debugger_fault_handler)(struct pt_regs *regs);
55
56EXPORT_SYMBOL(__debugger);
57EXPORT_SYMBOL(__debugger_ipi);
58EXPORT_SYMBOL(__debugger_bpt);
59EXPORT_SYMBOL(__debugger_sstep);
60EXPORT_SYMBOL(__debugger_iabr_match);
61EXPORT_SYMBOL(__debugger_dabr_match);
62EXPORT_SYMBOL(__debugger_fault_handler);
63#endif
64
65struct notifier_block *powerpc_die_chain;
66static DEFINE_SPINLOCK(die_notifier_lock);
67
68int register_die_notifier(struct notifier_block *nb)
69{
70 int err = 0;
71 unsigned long flags;
72
73 spin_lock_irqsave(&die_notifier_lock, flags);
74 err = notifier_chain_register(&powerpc_die_chain, nb);
75 spin_unlock_irqrestore(&die_notifier_lock, flags);
76 return err;
77}
78
79/*
80 * Trap & Exception support
81 */
82
83static DEFINE_SPINLOCK(die_lock);
84
85int die(const char *str, struct pt_regs *regs, long err)
86{
87 static int die_counter;
88 int nl = 0;
89
90 if (debugger(regs))
91 return 1;
92
93 console_verbose();
94 spin_lock_irq(&die_lock);
95 bust_spinlocks(1);
96 printk("Oops: %s, sig: %ld [#%d]\n", str, err, ++die_counter);
97#ifdef CONFIG_PREEMPT
98 printk("PREEMPT ");
99 nl = 1;
100#endif
101#ifdef CONFIG_SMP
102 printk("SMP NR_CPUS=%d ", NR_CPUS);
103 nl = 1;
104#endif
105#ifdef CONFIG_DEBUG_PAGEALLOC
106 printk("DEBUG_PAGEALLOC ");
107 nl = 1;
108#endif
109#ifdef CONFIG_NUMA
110 printk("NUMA ");
111 nl = 1;
112#endif
113 switch(systemcfg->platform) {
114 case PLATFORM_PSERIES:
115 printk("PSERIES ");
116 nl = 1;
117 break;
118 case PLATFORM_PSERIES_LPAR:
119 printk("PSERIES LPAR ");
120 nl = 1;
121 break;
122 case PLATFORM_ISERIES_LPAR:
123 printk("ISERIES LPAR ");
124 nl = 1;
125 break;
126 case PLATFORM_POWERMAC:
127 printk("POWERMAC ");
128 nl = 1;
129 break;
130 case PLATFORM_BPA:
131 printk("BPA ");
132 nl = 1;
133 break;
134 }
135 if (nl)
136 printk("\n");
137 print_modules();
138 show_regs(regs);
139 bust_spinlocks(0);
140 spin_unlock_irq(&die_lock);
141
142 if (in_interrupt())
143 panic("Fatal exception in interrupt");
144
145 if (panic_on_oops) {
146 printk(KERN_EMERG "Fatal exception: panic in 5 seconds\n");
147 ssleep(5);
148 panic("Fatal exception");
149 }
150 do_exit(SIGSEGV);
151
152 return 0;
153}
154
155void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr)
156{
157 siginfo_t info;
158
159 if (!user_mode(regs)) {
160 if (die("Exception in kernel mode", regs, signr))
161 return;
162 }
163
164 memset(&info, 0, sizeof(info));
165 info.si_signo = signr;
166 info.si_code = code;
167 info.si_addr = (void __user *) addr;
168 force_sig_info(signr, &info, current);
169}
170
171void system_reset_exception(struct pt_regs *regs)
172{
173 /* See if any machine dependent calls */
174 if (ppc_md.system_reset_exception)
175 ppc_md.system_reset_exception(regs);
176
177 die("System Reset", regs, 0);
178
179 /* Must die if the interrupt is not recoverable */
180 if (!(regs->msr & MSR_RI))
181 panic("Unrecoverable System Reset");
182
183 /* What should we do here? We could issue a shutdown or hard reset. */
184}
185
186void machine_check_exception(struct pt_regs *regs)
187{
188 int recover = 0;
189
190 /* See if any machine dependent calls */
191 if (ppc_md.machine_check_exception)
192 recover = ppc_md.machine_check_exception(regs);
193
194 if (recover)
195 return;
196
197 if (debugger_fault_handler(regs))
198 return;
199 die("Machine check", regs, 0);
200
201 /* Must die if the interrupt is not recoverable */
202 if (!(regs->msr & MSR_RI))
203 panic("Unrecoverable Machine check");
204}
205
206void unknown_exception(struct pt_regs *regs)
207{
208 printk("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
209 regs->nip, regs->msr, regs->trap);
210
211 _exception(SIGTRAP, regs, 0, 0);
212}
213
214void instruction_breakpoint_exception(struct pt_regs *regs)
215{
216 if (notify_die(DIE_IABR_MATCH, "iabr_match", regs, 5,
217 5, SIGTRAP) == NOTIFY_STOP)
218 return;
219 if (debugger_iabr_match(regs))
220 return;
221 _exception(SIGTRAP, regs, TRAP_BRKPT, regs->nip);
222}
223
224void __kprobes single_step_exception(struct pt_regs *regs)
225{
226 regs->msr &= ~MSR_SE; /* Turn off 'trace' bit */
227
228 if (notify_die(DIE_SSTEP, "single_step", regs, 5,
229 5, SIGTRAP) == NOTIFY_STOP)
230 return;
231 if (debugger_sstep(regs))
232 return;
233
234 _exception(SIGTRAP, regs, TRAP_TRACE, regs->nip);
235}
236
237/*
238 * After we have successfully emulated an instruction, we have to
239 * check if the instruction was being single-stepped, and if so,
240 * pretend we got a single-step exception. This was pointed out
241 * by Kumar Gala. -- paulus
242 */
243static inline void emulate_single_step(struct pt_regs *regs)
244{
245 if (regs->msr & MSR_SE)
246 single_step_exception(regs);
247}
248
249static void parse_fpe(struct pt_regs *regs)
250{
251 int code = 0;
252 unsigned long fpscr;
253
254 flush_fp_to_thread(current);
255
256 fpscr = current->thread.fpscr;
257
258 /* Invalid operation */
259 if ((fpscr & FPSCR_VE) && (fpscr & FPSCR_VX))
260 code = FPE_FLTINV;
261
262 /* Overflow */
263 else if ((fpscr & FPSCR_OE) && (fpscr & FPSCR_OX))
264 code = FPE_FLTOVF;
265
266 /* Underflow */
267 else if ((fpscr & FPSCR_UE) && (fpscr & FPSCR_UX))
268 code = FPE_FLTUND;
269
270 /* Divide by zero */
271 else if ((fpscr & FPSCR_ZE) && (fpscr & FPSCR_ZX))
272 code = FPE_FLTDIV;
273
274 /* Inexact result */
275 else if ((fpscr & FPSCR_XE) && (fpscr & FPSCR_XX))
276 code = FPE_FLTRES;
277
278 _exception(SIGFPE, regs, code, regs->nip);
279}
280
281/*
282 * Illegal instruction emulation support. Return non-zero if we can't
283 * emulate, or -EFAULT if the associated memory access caused an access
284 * fault. Return zero on success.
285 */
286
287#define INST_MFSPR_PVR 0x7c1f42a6
288#define INST_MFSPR_PVR_MASK 0xfc1fffff
289
290#define INST_DCBA 0x7c0005ec
291#define INST_DCBA_MASK 0x7c0007fe
292
293#define INST_MCRXR 0x7c000400
294#define INST_MCRXR_MASK 0x7c0007fe
295
296static int emulate_instruction(struct pt_regs *regs)
297{
298 unsigned int instword;
299
300 if (!user_mode(regs))
301 return -EINVAL;
302
303 CHECK_FULL_REGS(regs);
304
305 if (get_user(instword, (unsigned int __user *)(regs->nip)))
306 return -EFAULT;
307
308 /* Emulate the mfspr rD, PVR. */
309 if ((instword & INST_MFSPR_PVR_MASK) == INST_MFSPR_PVR) {
310 unsigned int rd;
311
312 rd = (instword >> 21) & 0x1f;
313 regs->gpr[rd] = mfspr(SPRN_PVR);
314 return 0;
315 }
316
317 /* Emulating the dcba insn is just a no-op. */
318 if ((instword & INST_DCBA_MASK) == INST_DCBA) {
319 static int warned;
320
321 if (!warned) {
322 printk(KERN_WARNING
323 "process %d (%s) uses obsolete 'dcba' insn\n",
324 current->pid, current->comm);
325 warned = 1;
326 }
327 return 0;
328 }
329
330 /* Emulate the mcrxr insn. */
331 if ((instword & INST_MCRXR_MASK) == INST_MCRXR) {
332 static int warned;
333 unsigned int shift;
334
335 if (!warned) {
336 printk(KERN_WARNING
337 "process %d (%s) uses obsolete 'mcrxr' insn\n",
338 current->pid, current->comm);
339 warned = 1;
340 }
341
342 shift = (instword >> 21) & 0x1c;
343 regs->ccr &= ~(0xf0000000 >> shift);
344 regs->ccr |= (regs->xer & 0xf0000000) >> shift;
345 regs->xer &= ~0xf0000000;
346 return 0;
347 }
348
349 return -EINVAL;
350}
351
352/*
353 * Look through the list of trap instructions that are used for BUG(),
354 * BUG_ON() and WARN_ON() and see if we hit one. At this point we know
355 * that the exception was caused by a trap instruction of some kind.
356 * Returns 1 if we should continue (i.e. it was a WARN_ON) or 0
357 * otherwise.
358 */
359extern struct bug_entry __start___bug_table[], __stop___bug_table[];
360
361#ifndef CONFIG_MODULES
362#define module_find_bug(x) NULL
363#endif
364
365struct bug_entry *find_bug(unsigned long bugaddr)
366{
367 struct bug_entry *bug;
368
369 for (bug = __start___bug_table; bug < __stop___bug_table; ++bug)
370 if (bugaddr == bug->bug_addr)
371 return bug;
372 return module_find_bug(bugaddr);
373}
374
375static int
376check_bug_trap(struct pt_regs *regs)
377{
378 struct bug_entry *bug;
379 unsigned long addr;
380
381 if (regs->msr & MSR_PR)
382 return 0; /* not in kernel */
383 addr = regs->nip; /* address of trap instruction */
384 if (addr < PAGE_OFFSET)
385 return 0;
386 bug = find_bug(regs->nip);
387 if (bug == NULL)
388 return 0;
389 if (bug->line & BUG_WARNING_TRAP) {
390 /* this is a WARN_ON rather than BUG/BUG_ON */
391 printk(KERN_ERR "Badness in %s at %s:%d\n",
392 bug->function, bug->file,
393 bug->line & ~BUG_WARNING_TRAP);
394 show_stack(current, (void *)regs->gpr[1]);
395 return 1;
396 }
397 printk(KERN_CRIT "kernel BUG in %s at %s:%d!\n",
398 bug->function, bug->file, bug->line);
399 return 0;
400}
401
402void __kprobes program_check_exception(struct pt_regs *regs)
403{
404 if (debugger_fault_handler(regs))
405 return;
406
407 if (regs->msr & 0x100000) {
408 /* IEEE FP exception */
409 parse_fpe(regs);
410 } else if (regs->msr & 0x20000) {
411 /* trap exception */
412
413 if (notify_die(DIE_BPT, "breakpoint", regs, 5,
414 5, SIGTRAP) == NOTIFY_STOP)
415 return;
416 if (debugger_bpt(regs))
417 return;
418
419 if (check_bug_trap(regs)) {
420 regs->nip += 4;
421 return;
422 }
423 _exception(SIGTRAP, regs, TRAP_BRKPT, regs->nip);
424
425 } else {
426 /* Privileged or illegal instruction; try to emulate it. */
427 switch (emulate_instruction(regs)) {
428 case 0:
429 regs->nip += 4;
430 emulate_single_step(regs);
431 break;
432
433 case -EFAULT:
434 _exception(SIGSEGV, regs, SEGV_MAPERR, regs->nip);
435 break;
436
437 default:
438 if (regs->msr & 0x40000)
439 /* priveleged */
440 _exception(SIGILL, regs, ILL_PRVOPC, regs->nip);
441 else
442 /* illegal */
443 _exception(SIGILL, regs, ILL_ILLOPC, regs->nip);
444 break;
445 }
446 }
447}
448
449void kernel_fp_unavailable_exception(struct pt_regs *regs)
450{
451 printk(KERN_EMERG "Unrecoverable FP Unavailable Exception "
452 "%lx at %lx\n", regs->trap, regs->nip);
453 die("Unrecoverable FP Unavailable Exception", regs, SIGABRT);
454}
455
456void altivec_unavailable_exception(struct pt_regs *regs)
457{
458 if (user_mode(regs)) {
459 /* A user program has executed an altivec instruction,
460 but this kernel doesn't support altivec. */
461 _exception(SIGILL, regs, ILL_ILLOPC, regs->nip);
462 return;
463 }
464 printk(KERN_EMERG "Unrecoverable VMX/Altivec Unavailable Exception "
465 "%lx at %lx\n", regs->trap, regs->nip);
466 die("Unrecoverable VMX/Altivec Unavailable Exception", regs, SIGABRT);
467}
468
469extern perf_irq_t perf_irq;
470
471void performance_monitor_exception(struct pt_regs *regs)
472{
473 perf_irq(regs);
474}
475
476void alignment_exception(struct pt_regs *regs)
477{
478 int fixed;
479
480 fixed = fix_alignment(regs);
481
482 if (fixed == 1) {
483 regs->nip += 4; /* skip over emulated instruction */
484 emulate_single_step(regs);
485 return;
486 }
487
488 /* Operand address was bad */
489 if (fixed == -EFAULT) {
490 if (user_mode(regs)) {
491 _exception(SIGSEGV, regs, SEGV_MAPERR, regs->dar);
492 } else {
493 /* Search exception table */
494 bad_page_fault(regs, regs->dar, SIGSEGV);
495 }
496
497 return;
498 }
499
500 _exception(SIGBUS, regs, BUS_ADRALN, regs->nip);
501}
502
503#ifdef CONFIG_ALTIVEC
504void altivec_assist_exception(struct pt_regs *regs)
505{
506 int err;
507 siginfo_t info;
508
509 if (!user_mode(regs)) {
510 printk(KERN_EMERG "VMX/Altivec assist exception in kernel mode"
511 " at %lx\n", regs->nip);
512 die("Kernel VMX/Altivec assist exception", regs, SIGILL);
513 }
514
515 flush_altivec_to_thread(current);
516
517 err = emulate_altivec(regs);
518 if (err == 0) {
519 regs->nip += 4; /* skip emulated instruction */
520 emulate_single_step(regs);
521 return;
522 }
523
524 if (err == -EFAULT) {
525 /* got an error reading the instruction */
526 info.si_signo = SIGSEGV;
527 info.si_errno = 0;
528 info.si_code = SEGV_MAPERR;
529 info.si_addr = (void __user *) regs->nip;
530 force_sig_info(SIGSEGV, &info, current);
531 } else {
532 /* didn't recognize the instruction */
533 /* XXX quick hack for now: set the non-Java bit in the VSCR */
534 if (printk_ratelimit())
535 printk(KERN_ERR "Unrecognized altivec instruction "
536 "in %s at %lx\n", current->comm, regs->nip);
537 current->thread.vscr.u[3] |= 0x10000;
538 }
539}
540#endif /* CONFIG_ALTIVEC */
541
542/*
543 * We enter here if we get an unrecoverable exception, that is, one
544 * that happened at a point where the RI (recoverable interrupt) bit
545 * in the MSR is 0. This indicates that SRR0/1 are live, and that
546 * we therefore lost state by taking this exception.
547 */
548void unrecoverable_exception(struct pt_regs *regs)
549{
550 printk(KERN_EMERG "Unrecoverable exception %lx at %lx\n",
551 regs->trap, regs->nip);
552 die("Unrecoverable exception", regs, SIGABRT);
553}
554
555/*
556 * We enter here if we discover during exception entry that we are
557 * running in supervisor mode with a userspace value in the stack pointer.
558 */
559void kernel_bad_stack(struct pt_regs *regs)
560{
561 printk(KERN_EMERG "Bad kernel stack pointer %lx at %lx\n",
562 regs->gpr[1], regs->nip);
563 die("Bad kernel stack pointer", regs, SIGABRT);
564}
565
566void __init trap_init(void)
567{
568}
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