Provide the missing LIBUSB_LOG_LEVEL_* for older libusb or FreeBSD. Providing just...
[qemu.git] / user-exec.c
1 /*
2 * User emulator execution
3 *
4 * Copyright (c) 2003-2005 Fabrice Bellard
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
18 */
19 #include "config.h"
20 #include "cpu.h"
21 #include "disas/disas.h"
22 #include "tcg.h"
23 #include "qemu/bitops.h"
24 #include "exec/cpu_ldst.h"
25
26 #undef EAX
27 #undef ECX
28 #undef EDX
29 #undef EBX
30 #undef ESP
31 #undef EBP
32 #undef ESI
33 #undef EDI
34 #undef EIP
35 #include <signal.h>
36 #ifdef __linux__
37 #include <sys/ucontext.h>
38 #endif
39
40 //#define DEBUG_SIGNAL
41
42 static void exception_action(CPUState *cpu)
43 {
44 #if defined(TARGET_I386)
45 X86CPU *x86_cpu = X86_CPU(cpu);
46 CPUX86State *env1 = &x86_cpu->env;
47
48 raise_exception_err(env1, cpu->exception_index, env1->error_code);
49 #else
50 cpu_loop_exit(cpu);
51 #endif
52 }
53
54 /* exit the current TB from a signal handler. The host registers are
55 restored in a state compatible with the CPU emulator
56 */
57 void cpu_resume_from_signal(CPUState *cpu, void *puc)
58 {
59 #ifdef __linux__
60 struct ucontext *uc = puc;
61 #elif defined(__OpenBSD__)
62 struct sigcontext *uc = puc;
63 #endif
64
65 if (puc) {
66 /* XXX: use siglongjmp ? */
67 #ifdef __linux__
68 #ifdef __ia64
69 sigprocmask(SIG_SETMASK, (sigset_t *)&uc->uc_sigmask, NULL);
70 #else
71 sigprocmask(SIG_SETMASK, &uc->uc_sigmask, NULL);
72 #endif
73 #elif defined(__OpenBSD__)
74 sigprocmask(SIG_SETMASK, &uc->sc_mask, NULL);
75 #endif
76 }
77 cpu->exception_index = -1;
78 siglongjmp(cpu->jmp_env, 1);
79 }
80
81 /* 'pc' is the host PC at which the exception was raised. 'address' is
82 the effective address of the memory exception. 'is_write' is 1 if a
83 write caused the exception and otherwise 0'. 'old_set' is the
84 signal set which should be restored */
85 static inline int handle_cpu_signal(uintptr_t pc, unsigned long address,
86 int is_write, sigset_t *old_set,
87 void *puc)
88 {
89 CPUState *cpu;
90 CPUClass *cc;
91 int ret;
92
93 #if defined(DEBUG_SIGNAL)
94 qemu_printf("qemu: SIGSEGV pc=0x%08lx address=%08lx w=%d oldset=0x%08lx\n",
95 pc, address, is_write, *(unsigned long *)old_set);
96 #endif
97 /* XXX: locking issue */
98 if (is_write && h2g_valid(address)
99 && page_unprotect(h2g(address), pc, puc)) {
100 return 1;
101 }
102
103 /* Convert forcefully to guest address space, invalid addresses
104 are still valid segv ones */
105 address = h2g_nocheck(address);
106
107 cpu = current_cpu;
108 cc = CPU_GET_CLASS(cpu);
109 /* see if it is an MMU fault */
110 g_assert(cc->handle_mmu_fault);
111 ret = cc->handle_mmu_fault(cpu, address, is_write, MMU_USER_IDX);
112 if (ret < 0) {
113 return 0; /* not an MMU fault */
114 }
115 if (ret == 0) {
116 return 1; /* the MMU fault was handled without causing real CPU fault */
117 }
118 /* now we have a real cpu fault */
119 cpu_restore_state(cpu, pc);
120
121 /* we restore the process signal mask as the sigreturn should
122 do it (XXX: use sigsetjmp) */
123 sigprocmask(SIG_SETMASK, old_set, NULL);
124 exception_action(cpu);
125
126 /* never comes here */
127 return 1;
128 }
129
130 #if defined(__i386__)
131
132 #if defined(__APPLE__)
133 #include <sys/ucontext.h>
134
135 #define EIP_sig(context) (*((unsigned long *)&(context)->uc_mcontext->ss.eip))
136 #define TRAP_sig(context) ((context)->uc_mcontext->es.trapno)
137 #define ERROR_sig(context) ((context)->uc_mcontext->es.err)
138 #define MASK_sig(context) ((context)->uc_sigmask)
139 #elif defined(__NetBSD__)
140 #include <ucontext.h>
141
142 #define EIP_sig(context) ((context)->uc_mcontext.__gregs[_REG_EIP])
143 #define TRAP_sig(context) ((context)->uc_mcontext.__gregs[_REG_TRAPNO])
144 #define ERROR_sig(context) ((context)->uc_mcontext.__gregs[_REG_ERR])
145 #define MASK_sig(context) ((context)->uc_sigmask)
146 #elif defined(__FreeBSD__) || defined(__DragonFly__)
147 #include <ucontext.h>
148
149 #define EIP_sig(context) (*((unsigned long *)&(context)->uc_mcontext.mc_eip))
150 #define TRAP_sig(context) ((context)->uc_mcontext.mc_trapno)
151 #define ERROR_sig(context) ((context)->uc_mcontext.mc_err)
152 #define MASK_sig(context) ((context)->uc_sigmask)
153 #elif defined(__OpenBSD__)
154 #define EIP_sig(context) ((context)->sc_eip)
155 #define TRAP_sig(context) ((context)->sc_trapno)
156 #define ERROR_sig(context) ((context)->sc_err)
157 #define MASK_sig(context) ((context)->sc_mask)
158 #else
159 #define EIP_sig(context) ((context)->uc_mcontext.gregs[REG_EIP])
160 #define TRAP_sig(context) ((context)->uc_mcontext.gregs[REG_TRAPNO])
161 #define ERROR_sig(context) ((context)->uc_mcontext.gregs[REG_ERR])
162 #define MASK_sig(context) ((context)->uc_sigmask)
163 #endif
164
165 int cpu_signal_handler(int host_signum, void *pinfo,
166 void *puc)
167 {
168 siginfo_t *info = pinfo;
169 #if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__DragonFly__)
170 ucontext_t *uc = puc;
171 #elif defined(__OpenBSD__)
172 struct sigcontext *uc = puc;
173 #else
174 struct ucontext *uc = puc;
175 #endif
176 unsigned long pc;
177 int trapno;
178
179 #ifndef REG_EIP
180 /* for glibc 2.1 */
181 #define REG_EIP EIP
182 #define REG_ERR ERR
183 #define REG_TRAPNO TRAPNO
184 #endif
185 pc = EIP_sig(uc);
186 trapno = TRAP_sig(uc);
187 return handle_cpu_signal(pc, (unsigned long)info->si_addr,
188 trapno == 0xe ?
189 (ERROR_sig(uc) >> 1) & 1 : 0,
190 &MASK_sig(uc), puc);
191 }
192
193 #elif defined(__x86_64__)
194
195 #ifdef __NetBSD__
196 #define PC_sig(context) _UC_MACHINE_PC(context)
197 #define TRAP_sig(context) ((context)->uc_mcontext.__gregs[_REG_TRAPNO])
198 #define ERROR_sig(context) ((context)->uc_mcontext.__gregs[_REG_ERR])
199 #define MASK_sig(context) ((context)->uc_sigmask)
200 #elif defined(__OpenBSD__)
201 #define PC_sig(context) ((context)->sc_rip)
202 #define TRAP_sig(context) ((context)->sc_trapno)
203 #define ERROR_sig(context) ((context)->sc_err)
204 #define MASK_sig(context) ((context)->sc_mask)
205 #elif defined(__FreeBSD__) || defined(__DragonFly__)
206 #include <ucontext.h>
207
208 #define PC_sig(context) (*((unsigned long *)&(context)->uc_mcontext.mc_rip))
209 #define TRAP_sig(context) ((context)->uc_mcontext.mc_trapno)
210 #define ERROR_sig(context) ((context)->uc_mcontext.mc_err)
211 #define MASK_sig(context) ((context)->uc_sigmask)
212 #else
213 #define PC_sig(context) ((context)->uc_mcontext.gregs[REG_RIP])
214 #define TRAP_sig(context) ((context)->uc_mcontext.gregs[REG_TRAPNO])
215 #define ERROR_sig(context) ((context)->uc_mcontext.gregs[REG_ERR])
216 #define MASK_sig(context) ((context)->uc_sigmask)
217 #endif
218
219 int cpu_signal_handler(int host_signum, void *pinfo,
220 void *puc)
221 {
222 siginfo_t *info = pinfo;
223 unsigned long pc;
224 #if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__DragonFly__)
225 ucontext_t *uc = puc;
226 #elif defined(__OpenBSD__)
227 struct sigcontext *uc = puc;
228 #else
229 struct ucontext *uc = puc;
230 #endif
231
232 pc = PC_sig(uc);
233 return handle_cpu_signal(pc, (unsigned long)info->si_addr,
234 TRAP_sig(uc) == 0xe ?
235 (ERROR_sig(uc) >> 1) & 1 : 0,
236 &MASK_sig(uc), puc);
237 }
238
239 #elif defined(_ARCH_PPC)
240
241 /***********************************************************************
242 * signal context platform-specific definitions
243 * From Wine
244 */
245 #ifdef linux
246 /* All Registers access - only for local access */
247 #define REG_sig(reg_name, context) \
248 ((context)->uc_mcontext.regs->reg_name)
249 /* Gpr Registers access */
250 #define GPR_sig(reg_num, context) REG_sig(gpr[reg_num], context)
251 /* Program counter */
252 #define IAR_sig(context) REG_sig(nip, context)
253 /* Machine State Register (Supervisor) */
254 #define MSR_sig(context) REG_sig(msr, context)
255 /* Count register */
256 #define CTR_sig(context) REG_sig(ctr, context)
257 /* User's integer exception register */
258 #define XER_sig(context) REG_sig(xer, context)
259 /* Link register */
260 #define LR_sig(context) REG_sig(link, context)
261 /* Condition register */
262 #define CR_sig(context) REG_sig(ccr, context)
263
264 /* Float Registers access */
265 #define FLOAT_sig(reg_num, context) \
266 (((double *)((char *)((context)->uc_mcontext.regs + 48 * 4)))[reg_num])
267 #define FPSCR_sig(context) \
268 (*(int *)((char *)((context)->uc_mcontext.regs + (48 + 32 * 2) * 4)))
269 /* Exception Registers access */
270 #define DAR_sig(context) REG_sig(dar, context)
271 #define DSISR_sig(context) REG_sig(dsisr, context)
272 #define TRAP_sig(context) REG_sig(trap, context)
273 #endif /* linux */
274
275 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
276 #include <ucontext.h>
277 #define IAR_sig(context) ((context)->uc_mcontext.mc_srr0)
278 #define MSR_sig(context) ((context)->uc_mcontext.mc_srr1)
279 #define CTR_sig(context) ((context)->uc_mcontext.mc_ctr)
280 #define XER_sig(context) ((context)->uc_mcontext.mc_xer)
281 #define LR_sig(context) ((context)->uc_mcontext.mc_lr)
282 #define CR_sig(context) ((context)->uc_mcontext.mc_cr)
283 /* Exception Registers access */
284 #define DAR_sig(context) ((context)->uc_mcontext.mc_dar)
285 #define DSISR_sig(context) ((context)->uc_mcontext.mc_dsisr)
286 #define TRAP_sig(context) ((context)->uc_mcontext.mc_exc)
287 #endif /* __FreeBSD__|| __FreeBSD_kernel__ */
288
289 #ifdef __APPLE__
290 #include <sys/ucontext.h>
291 typedef struct ucontext SIGCONTEXT;
292 /* All Registers access - only for local access */
293 #define REG_sig(reg_name, context) \
294 ((context)->uc_mcontext->ss.reg_name)
295 #define FLOATREG_sig(reg_name, context) \
296 ((context)->uc_mcontext->fs.reg_name)
297 #define EXCEPREG_sig(reg_name, context) \
298 ((context)->uc_mcontext->es.reg_name)
299 #define VECREG_sig(reg_name, context) \
300 ((context)->uc_mcontext->vs.reg_name)
301 /* Gpr Registers access */
302 #define GPR_sig(reg_num, context) REG_sig(r##reg_num, context)
303 /* Program counter */
304 #define IAR_sig(context) REG_sig(srr0, context)
305 /* Machine State Register (Supervisor) */
306 #define MSR_sig(context) REG_sig(srr1, context)
307 #define CTR_sig(context) REG_sig(ctr, context)
308 /* Link register */
309 #define XER_sig(context) REG_sig(xer, context)
310 /* User's integer exception register */
311 #define LR_sig(context) REG_sig(lr, context)
312 /* Condition register */
313 #define CR_sig(context) REG_sig(cr, context)
314 /* Float Registers access */
315 #define FLOAT_sig(reg_num, context) \
316 FLOATREG_sig(fpregs[reg_num], context)
317 #define FPSCR_sig(context) \
318 ((double)FLOATREG_sig(fpscr, context))
319 /* Exception Registers access */
320 /* Fault registers for coredump */
321 #define DAR_sig(context) EXCEPREG_sig(dar, context)
322 #define DSISR_sig(context) EXCEPREG_sig(dsisr, context)
323 /* number of powerpc exception taken */
324 #define TRAP_sig(context) EXCEPREG_sig(exception, context)
325 #endif /* __APPLE__ */
326
327 int cpu_signal_handler(int host_signum, void *pinfo,
328 void *puc)
329 {
330 siginfo_t *info = pinfo;
331 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
332 ucontext_t *uc = puc;
333 #else
334 struct ucontext *uc = puc;
335 #endif
336 unsigned long pc;
337 int is_write;
338
339 pc = IAR_sig(uc);
340 is_write = 0;
341 #if 0
342 /* ppc 4xx case */
343 if (DSISR_sig(uc) & 0x00800000) {
344 is_write = 1;
345 }
346 #else
347 if (TRAP_sig(uc) != 0x400 && (DSISR_sig(uc) & 0x02000000)) {
348 is_write = 1;
349 }
350 #endif
351 return handle_cpu_signal(pc, (unsigned long)info->si_addr,
352 is_write, &uc->uc_sigmask, puc);
353 }
354
355 #elif defined(__alpha__)
356
357 int cpu_signal_handler(int host_signum, void *pinfo,
358 void *puc)
359 {
360 siginfo_t *info = pinfo;
361 struct ucontext *uc = puc;
362 uint32_t *pc = uc->uc_mcontext.sc_pc;
363 uint32_t insn = *pc;
364 int is_write = 0;
365
366 /* XXX: need kernel patch to get write flag faster */
367 switch (insn >> 26) {
368 case 0x0d: /* stw */
369 case 0x0e: /* stb */
370 case 0x0f: /* stq_u */
371 case 0x24: /* stf */
372 case 0x25: /* stg */
373 case 0x26: /* sts */
374 case 0x27: /* stt */
375 case 0x2c: /* stl */
376 case 0x2d: /* stq */
377 case 0x2e: /* stl_c */
378 case 0x2f: /* stq_c */
379 is_write = 1;
380 }
381
382 return handle_cpu_signal(pc, (unsigned long)info->si_addr,
383 is_write, &uc->uc_sigmask, puc);
384 }
385 #elif defined(__sparc__)
386
387 int cpu_signal_handler(int host_signum, void *pinfo,
388 void *puc)
389 {
390 siginfo_t *info = pinfo;
391 int is_write;
392 uint32_t insn;
393 #if !defined(__arch64__) || defined(CONFIG_SOLARIS)
394 uint32_t *regs = (uint32_t *)(info + 1);
395 void *sigmask = (regs + 20);
396 /* XXX: is there a standard glibc define ? */
397 unsigned long pc = regs[1];
398 #else
399 #ifdef __linux__
400 struct sigcontext *sc = puc;
401 unsigned long pc = sc->sigc_regs.tpc;
402 void *sigmask = (void *)sc->sigc_mask;
403 #elif defined(__OpenBSD__)
404 struct sigcontext *uc = puc;
405 unsigned long pc = uc->sc_pc;
406 void *sigmask = (void *)(long)uc->sc_mask;
407 #endif
408 #endif
409
410 /* XXX: need kernel patch to get write flag faster */
411 is_write = 0;
412 insn = *(uint32_t *)pc;
413 if ((insn >> 30) == 3) {
414 switch ((insn >> 19) & 0x3f) {
415 case 0x05: /* stb */
416 case 0x15: /* stba */
417 case 0x06: /* sth */
418 case 0x16: /* stha */
419 case 0x04: /* st */
420 case 0x14: /* sta */
421 case 0x07: /* std */
422 case 0x17: /* stda */
423 case 0x0e: /* stx */
424 case 0x1e: /* stxa */
425 case 0x24: /* stf */
426 case 0x34: /* stfa */
427 case 0x27: /* stdf */
428 case 0x37: /* stdfa */
429 case 0x26: /* stqf */
430 case 0x36: /* stqfa */
431 case 0x25: /* stfsr */
432 case 0x3c: /* casa */
433 case 0x3e: /* casxa */
434 is_write = 1;
435 break;
436 }
437 }
438 return handle_cpu_signal(pc, (unsigned long)info->si_addr,
439 is_write, sigmask, NULL);
440 }
441
442 #elif defined(__arm__)
443
444 int cpu_signal_handler(int host_signum, void *pinfo,
445 void *puc)
446 {
447 siginfo_t *info = pinfo;
448 struct ucontext *uc = puc;
449 unsigned long pc;
450 int is_write;
451
452 #if defined(__GLIBC__) && (__GLIBC__ < 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ <= 3))
453 pc = uc->uc_mcontext.gregs[R15];
454 #else
455 pc = uc->uc_mcontext.arm_pc;
456 #endif
457
458 /* error_code is the FSR value, in which bit 11 is WnR (assuming a v6 or
459 * later processor; on v5 we will always report this as a read).
460 */
461 is_write = extract32(uc->uc_mcontext.error_code, 11, 1);
462 return handle_cpu_signal(pc, (unsigned long)info->si_addr,
463 is_write,
464 &uc->uc_sigmask, puc);
465 }
466
467 #elif defined(__aarch64__)
468
469 int cpu_signal_handler(int host_signum, void *pinfo, void *puc)
470 {
471 siginfo_t *info = pinfo;
472 struct ucontext *uc = puc;
473 uintptr_t pc = uc->uc_mcontext.pc;
474 uint32_t insn = *(uint32_t *)pc;
475 bool is_write;
476
477 /* XXX: need kernel patch to get write flag faster. */
478 is_write = ( (insn & 0xbfff0000) == 0x0c000000 /* C3.3.1 */
479 || (insn & 0xbfe00000) == 0x0c800000 /* C3.3.2 */
480 || (insn & 0xbfdf0000) == 0x0d000000 /* C3.3.3 */
481 || (insn & 0xbfc00000) == 0x0d800000 /* C3.3.4 */
482 || (insn & 0x3f400000) == 0x08000000 /* C3.3.6 */
483 || (insn & 0x3bc00000) == 0x39000000 /* C3.3.13 */
484 || (insn & 0x3fc00000) == 0x3d800000 /* ... 128bit */
485 /* Ingore bits 10, 11 & 21, controlling indexing. */
486 || (insn & 0x3bc00000) == 0x38000000 /* C3.3.8-12 */
487 || (insn & 0x3fe00000) == 0x3c800000 /* ... 128bit */
488 /* Ignore bits 23 & 24, controlling indexing. */
489 || (insn & 0x3a400000) == 0x28000000); /* C3.3.7,14-16 */
490
491 return handle_cpu_signal(pc, (uintptr_t)info->si_addr,
492 is_write, &uc->uc_sigmask, puc);
493 }
494
495 #elif defined(__mc68000)
496
497 int cpu_signal_handler(int host_signum, void *pinfo,
498 void *puc)
499 {
500 siginfo_t *info = pinfo;
501 struct ucontext *uc = puc;
502 unsigned long pc;
503 int is_write;
504
505 pc = uc->uc_mcontext.gregs[16];
506 /* XXX: compute is_write */
507 is_write = 0;
508 return handle_cpu_signal(pc, (unsigned long)info->si_addr,
509 is_write,
510 &uc->uc_sigmask, puc);
511 }
512
513 #elif defined(__ia64)
514
515 #ifndef __ISR_VALID
516 /* This ought to be in <bits/siginfo.h>... */
517 # define __ISR_VALID 1
518 #endif
519
520 int cpu_signal_handler(int host_signum, void *pinfo, void *puc)
521 {
522 siginfo_t *info = pinfo;
523 struct ucontext *uc = puc;
524 unsigned long ip;
525 int is_write = 0;
526
527 ip = uc->uc_mcontext.sc_ip;
528 switch (host_signum) {
529 case SIGILL:
530 case SIGFPE:
531 case SIGSEGV:
532 case SIGBUS:
533 case SIGTRAP:
534 if (info->si_code && (info->si_segvflags & __ISR_VALID)) {
535 /* ISR.W (write-access) is bit 33: */
536 is_write = (info->si_isr >> 33) & 1;
537 }
538 break;
539
540 default:
541 break;
542 }
543 return handle_cpu_signal(ip, (unsigned long)info->si_addr,
544 is_write,
545 (sigset_t *)&uc->uc_sigmask, puc);
546 }
547
548 #elif defined(__s390__)
549
550 int cpu_signal_handler(int host_signum, void *pinfo,
551 void *puc)
552 {
553 siginfo_t *info = pinfo;
554 struct ucontext *uc = puc;
555 unsigned long pc;
556 uint16_t *pinsn;
557 int is_write = 0;
558
559 pc = uc->uc_mcontext.psw.addr;
560
561 /* ??? On linux, the non-rt signal handler has 4 (!) arguments instead
562 of the normal 2 arguments. The 3rd argument contains the "int_code"
563 from the hardware which does in fact contain the is_write value.
564 The rt signal handler, as far as I can tell, does not give this value
565 at all. Not that we could get to it from here even if it were. */
566 /* ??? This is not even close to complete, since it ignores all
567 of the read-modify-write instructions. */
568 pinsn = (uint16_t *)pc;
569 switch (pinsn[0] >> 8) {
570 case 0x50: /* ST */
571 case 0x42: /* STC */
572 case 0x40: /* STH */
573 is_write = 1;
574 break;
575 case 0xc4: /* RIL format insns */
576 switch (pinsn[0] & 0xf) {
577 case 0xf: /* STRL */
578 case 0xb: /* STGRL */
579 case 0x7: /* STHRL */
580 is_write = 1;
581 }
582 break;
583 case 0xe3: /* RXY format insns */
584 switch (pinsn[2] & 0xff) {
585 case 0x50: /* STY */
586 case 0x24: /* STG */
587 case 0x72: /* STCY */
588 case 0x70: /* STHY */
589 case 0x8e: /* STPQ */
590 case 0x3f: /* STRVH */
591 case 0x3e: /* STRV */
592 case 0x2f: /* STRVG */
593 is_write = 1;
594 }
595 break;
596 }
597 return handle_cpu_signal(pc, (unsigned long)info->si_addr,
598 is_write, &uc->uc_sigmask, puc);
599 }
600
601 #elif defined(__mips__)
602
603 int cpu_signal_handler(int host_signum, void *pinfo,
604 void *puc)
605 {
606 siginfo_t *info = pinfo;
607 struct ucontext *uc = puc;
608 greg_t pc = uc->uc_mcontext.pc;
609 int is_write;
610
611 /* XXX: compute is_write */
612 is_write = 0;
613 return handle_cpu_signal(pc, (unsigned long)info->si_addr,
614 is_write, &uc->uc_sigmask, puc);
615 }
616
617 #elif defined(__hppa__)
618
619 int cpu_signal_handler(int host_signum, void *pinfo,
620 void *puc)
621 {
622 siginfo_t *info = pinfo;
623 struct ucontext *uc = puc;
624 unsigned long pc = uc->uc_mcontext.sc_iaoq[0];
625 uint32_t insn = *(uint32_t *)pc;
626 int is_write = 0;
627
628 /* XXX: need kernel patch to get write flag faster. */
629 switch (insn >> 26) {
630 case 0x1a: /* STW */
631 case 0x19: /* STH */
632 case 0x18: /* STB */
633 case 0x1b: /* STWM */
634 is_write = 1;
635 break;
636
637 case 0x09: /* CSTWX, FSTWX, FSTWS */
638 case 0x0b: /* CSTDX, FSTDX, FSTDS */
639 /* Distinguish from coprocessor load ... */
640 is_write = (insn >> 9) & 1;
641 break;
642
643 case 0x03:
644 switch ((insn >> 6) & 15) {
645 case 0xa: /* STWS */
646 case 0x9: /* STHS */
647 case 0x8: /* STBS */
648 case 0xe: /* STWAS */
649 case 0xc: /* STBYS */
650 is_write = 1;
651 }
652 break;
653 }
654
655 return handle_cpu_signal(pc, (unsigned long)info->si_addr,
656 is_write, &uc->uc_sigmask, puc);
657 }
658
659 #else
660
661 #error host CPU specific signal handler needed
662
663 #endif