nbd: Add max-connections to nbd-server-start
[qemu.git] / linux-user / sparc / signal.c
1 /*
2 * Emulation of Linux signals
3 *
4 * Copyright (c) 2003 Fabrice Bellard
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program 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
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, see <http://www.gnu.org/licenses/>.
18 */
19 #include "qemu/osdep.h"
20 #include "qemu.h"
21 #include "signal-common.h"
22 #include "linux-user/trace.h"
23
24 #define __SUNOS_MAXWIN 31
25
26 /* This is what SunOS does, so shall I. */
27 struct target_sigcontext {
28 abi_ulong sigc_onstack; /* state to restore */
29
30 abi_ulong sigc_mask; /* sigmask to restore */
31 abi_ulong sigc_sp; /* stack pointer */
32 abi_ulong sigc_pc; /* program counter */
33 abi_ulong sigc_npc; /* next program counter */
34 abi_ulong sigc_psr; /* for condition codes etc */
35 abi_ulong sigc_g1; /* User uses these two registers */
36 abi_ulong sigc_o0; /* within the trampoline code. */
37
38 /* Now comes information regarding the users window set
39 * at the time of the signal.
40 */
41 abi_ulong sigc_oswins; /* outstanding windows */
42
43 /* stack ptrs for each regwin buf */
44 char *sigc_spbuf[__SUNOS_MAXWIN];
45
46 /* Windows to restore after signal */
47 struct {
48 abi_ulong locals[8];
49 abi_ulong ins[8];
50 } sigc_wbuf[__SUNOS_MAXWIN];
51 };
52 /* A Sparc stack frame */
53 struct sparc_stackf {
54 abi_ulong locals[8];
55 abi_ulong ins[8];
56 /* It's simpler to treat fp and callers_pc as elements of ins[]
57 * since we never need to access them ourselves.
58 */
59 char *structptr;
60 abi_ulong xargs[6];
61 abi_ulong xxargs[1];
62 };
63
64 typedef struct {
65 struct {
66 abi_ulong psr;
67 abi_ulong pc;
68 abi_ulong npc;
69 abi_ulong y;
70 abi_ulong u_regs[16]; /* globals and ins */
71 } si_regs;
72 int si_mask;
73 } __siginfo_t;
74
75 typedef struct {
76 abi_ulong si_float_regs[32];
77 unsigned long si_fsr;
78 unsigned long si_fpqdepth;
79 struct {
80 unsigned long *insn_addr;
81 unsigned long insn;
82 } si_fpqueue [16];
83 } qemu_siginfo_fpu_t;
84
85
86 struct target_signal_frame {
87 struct sparc_stackf ss;
88 __siginfo_t info;
89 abi_ulong fpu_save;
90 uint32_t insns[2] QEMU_ALIGNED(8);
91 abi_ulong extramask[TARGET_NSIG_WORDS - 1];
92 abi_ulong extra_size; /* Should be 0 */
93 qemu_siginfo_fpu_t fpu_state;
94 };
95 struct target_rt_signal_frame {
96 struct sparc_stackf ss;
97 siginfo_t info;
98 abi_ulong regs[20];
99 sigset_t mask;
100 abi_ulong fpu_save;
101 uint32_t insns[2];
102 stack_t stack;
103 unsigned int extra_size; /* Should be 0 */
104 qemu_siginfo_fpu_t fpu_state;
105 };
106
107 static inline abi_ulong get_sigframe(struct target_sigaction *sa,
108 CPUSPARCState *env,
109 unsigned long framesize)
110 {
111 abi_ulong sp = get_sp_from_cpustate(env);
112
113 /*
114 * If we are on the alternate signal stack and would overflow it, don't.
115 * Return an always-bogus address instead so we will die with SIGSEGV.
116 */
117 if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize))) {
118 return -1;
119 }
120
121 /* This is the X/Open sanctioned signal stack switching. */
122 sp = target_sigsp(sp, sa) - framesize;
123
124 /* Always align the stack frame. This handles two cases. First,
125 * sigaltstack need not be mindful of platform specific stack
126 * alignment. Second, if we took this signal because the stack
127 * is not aligned properly, we'd like to take the signal cleanly
128 * and report that.
129 */
130 sp &= ~15UL;
131
132 return sp;
133 }
134
135 static int
136 setup___siginfo(__siginfo_t *si, CPUSPARCState *env, abi_ulong mask)
137 {
138 int err = 0, i;
139
140 __put_user(env->psr, &si->si_regs.psr);
141 __put_user(env->pc, &si->si_regs.pc);
142 __put_user(env->npc, &si->si_regs.npc);
143 __put_user(env->y, &si->si_regs.y);
144 for (i=0; i < 8; i++) {
145 __put_user(env->gregs[i], &si->si_regs.u_regs[i]);
146 }
147 for (i=0; i < 8; i++) {
148 __put_user(env->regwptr[WREG_O0 + i], &si->si_regs.u_regs[i + 8]);
149 }
150 __put_user(mask, &si->si_mask);
151 return err;
152 }
153
154 #define NF_ALIGNEDSZ (((sizeof(struct target_signal_frame) + 7) & (~7)))
155
156 void setup_frame(int sig, struct target_sigaction *ka,
157 target_sigset_t *set, CPUSPARCState *env)
158 {
159 abi_ulong sf_addr;
160 struct target_signal_frame *sf;
161 int sigframe_size, err, i;
162
163 /* 1. Make sure everything is clean */
164 //synchronize_user_stack();
165
166 sigframe_size = NF_ALIGNEDSZ;
167 sf_addr = get_sigframe(ka, env, sigframe_size);
168 trace_user_setup_frame(env, sf_addr);
169
170 sf = lock_user(VERIFY_WRITE, sf_addr,
171 sizeof(struct target_signal_frame), 0);
172 if (!sf) {
173 goto sigsegv;
174 }
175 #if 0
176 if (invalid_frame_pointer(sf, sigframe_size))
177 goto sigill_and_return;
178 #endif
179 /* 2. Save the current process state */
180 err = setup___siginfo(&sf->info, env, set->sig[0]);
181 __put_user(0, &sf->extra_size);
182
183 //save_fpu_state(regs, &sf->fpu_state);
184 //__put_user(&sf->fpu_state, &sf->fpu_save);
185
186 __put_user(set->sig[0], &sf->info.si_mask);
187 for (i = 0; i < TARGET_NSIG_WORDS - 1; i++) {
188 __put_user(set->sig[i + 1], &sf->extramask[i]);
189 }
190
191 for (i = 0; i < 8; i++) {
192 __put_user(env->regwptr[i + WREG_L0], &sf->ss.locals[i]);
193 }
194 for (i = 0; i < 8; i++) {
195 __put_user(env->regwptr[i + WREG_I0], &sf->ss.ins[i]);
196 }
197 if (err)
198 goto sigsegv;
199
200 /* 3. signal handler back-trampoline and parameters */
201 env->regwptr[WREG_SP] = sf_addr;
202 env->regwptr[WREG_O0] = sig;
203 env->regwptr[WREG_O1] = sf_addr +
204 offsetof(struct target_signal_frame, info);
205 env->regwptr[WREG_O2] = sf_addr +
206 offsetof(struct target_signal_frame, info);
207
208 /* 4. signal handler */
209 env->pc = ka->_sa_handler;
210 env->npc = (env->pc + 4);
211 /* 5. return to kernel instructions */
212 if (ka->ka_restorer) {
213 env->regwptr[WREG_O7] = ka->ka_restorer;
214 } else {
215 uint32_t val32;
216
217 env->regwptr[WREG_O7] = sf_addr +
218 offsetof(struct target_signal_frame, insns) - 2 * 4;
219
220 /* mov __NR_sigreturn, %g1 */
221 val32 = 0x821020d8;
222 __put_user(val32, &sf->insns[0]);
223
224 /* t 0x10 */
225 val32 = 0x91d02010;
226 __put_user(val32, &sf->insns[1]);
227 }
228 unlock_user(sf, sf_addr, sizeof(struct target_signal_frame));
229 return;
230 #if 0
231 sigill_and_return:
232 force_sig(TARGET_SIGILL);
233 #endif
234 sigsegv:
235 unlock_user(sf, sf_addr, sizeof(struct target_signal_frame));
236 force_sigsegv(sig);
237 }
238
239 void setup_rt_frame(int sig, struct target_sigaction *ka,
240 target_siginfo_t *info,
241 target_sigset_t *set, CPUSPARCState *env)
242 {
243 qemu_log_mask(LOG_UNIMP, "setup_rt_frame: not implemented\n");
244 }
245
246 long do_sigreturn(CPUSPARCState *env)
247 {
248 abi_ulong sf_addr;
249 struct target_signal_frame *sf;
250 uint32_t up_psr, pc, npc;
251 target_sigset_t set;
252 sigset_t host_set;
253 int i;
254
255 sf_addr = env->regwptr[WREG_SP];
256 trace_user_do_sigreturn(env, sf_addr);
257 if (!lock_user_struct(VERIFY_READ, sf, sf_addr, 1)) {
258 goto segv_and_exit;
259 }
260
261 /* 1. Make sure we are not getting garbage from the user */
262
263 if (sf_addr & 3)
264 goto segv_and_exit;
265
266 __get_user(pc, &sf->info.si_regs.pc);
267 __get_user(npc, &sf->info.si_regs.npc);
268
269 if ((pc | npc) & 3) {
270 goto segv_and_exit;
271 }
272
273 /* 2. Restore the state */
274 __get_user(up_psr, &sf->info.si_regs.psr);
275
276 /* User can only change condition codes and FPU enabling in %psr. */
277 env->psr = (up_psr & (PSR_ICC /* | PSR_EF */))
278 | (env->psr & ~(PSR_ICC /* | PSR_EF */));
279
280 env->pc = pc;
281 env->npc = npc;
282 __get_user(env->y, &sf->info.si_regs.y);
283 for (i=0; i < 8; i++) {
284 __get_user(env->gregs[i], &sf->info.si_regs.u_regs[i]);
285 }
286 for (i=0; i < 8; i++) {
287 __get_user(env->regwptr[i + WREG_O0], &sf->info.si_regs.u_regs[i + 8]);
288 }
289
290 /* FIXME: implement FPU save/restore:
291 * __get_user(fpu_save, &sf->fpu_save);
292 * if (fpu_save) {
293 * if (restore_fpu_state(env, fpu_save)) {
294 * goto segv_and_exit;
295 * }
296 * }
297 */
298
299 /* This is pretty much atomic, no amount locking would prevent
300 * the races which exist anyways.
301 */
302 __get_user(set.sig[0], &sf->info.si_mask);
303 for(i = 1; i < TARGET_NSIG_WORDS; i++) {
304 __get_user(set.sig[i], &sf->extramask[i - 1]);
305 }
306
307 target_to_host_sigset_internal(&host_set, &set);
308 set_sigmask(&host_set);
309
310 unlock_user_struct(sf, sf_addr, 0);
311 return -TARGET_QEMU_ESIGRETURN;
312
313 segv_and_exit:
314 unlock_user_struct(sf, sf_addr, 0);
315 force_sig(TARGET_SIGSEGV);
316 return -TARGET_QEMU_ESIGRETURN;
317 }
318
319 long do_rt_sigreturn(CPUSPARCState *env)
320 {
321 trace_user_do_rt_sigreturn(env, 0);
322 qemu_log_mask(LOG_UNIMP, "do_rt_sigreturn: not implemented\n");
323 return -TARGET_ENOSYS;
324 }
325
326 #if defined(TARGET_SPARC64) && !defined(TARGET_ABI32)
327 #define SPARC_MC_TSTATE 0
328 #define SPARC_MC_PC 1
329 #define SPARC_MC_NPC 2
330 #define SPARC_MC_Y 3
331 #define SPARC_MC_G1 4
332 #define SPARC_MC_G2 5
333 #define SPARC_MC_G3 6
334 #define SPARC_MC_G4 7
335 #define SPARC_MC_G5 8
336 #define SPARC_MC_G6 9
337 #define SPARC_MC_G7 10
338 #define SPARC_MC_O0 11
339 #define SPARC_MC_O1 12
340 #define SPARC_MC_O2 13
341 #define SPARC_MC_O3 14
342 #define SPARC_MC_O4 15
343 #define SPARC_MC_O5 16
344 #define SPARC_MC_O6 17
345 #define SPARC_MC_O7 18
346 #define SPARC_MC_NGREG 19
347
348 typedef abi_ulong target_mc_greg_t;
349 typedef target_mc_greg_t target_mc_gregset_t[SPARC_MC_NGREG];
350
351 struct target_mc_fq {
352 abi_ulong *mcfq_addr;
353 uint32_t mcfq_insn;
354 };
355
356 struct target_mc_fpu {
357 union {
358 uint32_t sregs[32];
359 uint64_t dregs[32];
360 //uint128_t qregs[16];
361 } mcfpu_fregs;
362 abi_ulong mcfpu_fsr;
363 abi_ulong mcfpu_fprs;
364 abi_ulong mcfpu_gsr;
365 struct target_mc_fq *mcfpu_fq;
366 unsigned char mcfpu_qcnt;
367 unsigned char mcfpu_qentsz;
368 unsigned char mcfpu_enab;
369 };
370 typedef struct target_mc_fpu target_mc_fpu_t;
371
372 typedef struct {
373 target_mc_gregset_t mc_gregs;
374 target_mc_greg_t mc_fp;
375 target_mc_greg_t mc_i7;
376 target_mc_fpu_t mc_fpregs;
377 } target_mcontext_t;
378
379 struct target_ucontext {
380 struct target_ucontext *tuc_link;
381 abi_ulong tuc_flags;
382 target_sigset_t tuc_sigmask;
383 target_mcontext_t tuc_mcontext;
384 };
385
386 /* A V9 register window */
387 struct target_reg_window {
388 abi_ulong locals[8];
389 abi_ulong ins[8];
390 };
391
392 #define TARGET_STACK_BIAS 2047
393
394 /* {set, get}context() needed for 64-bit SparcLinux userland. */
395 void sparc64_set_context(CPUSPARCState *env)
396 {
397 abi_ulong ucp_addr;
398 struct target_ucontext *ucp;
399 target_mc_gregset_t *grp;
400 abi_ulong pc, npc, tstate;
401 abi_ulong fp, i7, w_addr;
402 unsigned int i;
403
404 ucp_addr = env->regwptr[WREG_O0];
405 if (!lock_user_struct(VERIFY_READ, ucp, ucp_addr, 1)) {
406 goto do_sigsegv;
407 }
408 grp = &ucp->tuc_mcontext.mc_gregs;
409 __get_user(pc, &((*grp)[SPARC_MC_PC]));
410 __get_user(npc, &((*grp)[SPARC_MC_NPC]));
411 if ((pc | npc) & 3) {
412 goto do_sigsegv;
413 }
414 if (env->regwptr[WREG_O1]) {
415 target_sigset_t target_set;
416 sigset_t set;
417
418 if (TARGET_NSIG_WORDS == 1) {
419 __get_user(target_set.sig[0], &ucp->tuc_sigmask.sig[0]);
420 } else {
421 abi_ulong *src, *dst;
422 src = ucp->tuc_sigmask.sig;
423 dst = target_set.sig;
424 for (i = 0; i < TARGET_NSIG_WORDS; i++, dst++, src++) {
425 __get_user(*dst, src);
426 }
427 }
428 target_to_host_sigset_internal(&set, &target_set);
429 set_sigmask(&set);
430 }
431 env->pc = pc;
432 env->npc = npc;
433 __get_user(env->y, &((*grp)[SPARC_MC_Y]));
434 __get_user(tstate, &((*grp)[SPARC_MC_TSTATE]));
435 env->asi = (tstate >> 24) & 0xff;
436 cpu_put_ccr(env, tstate >> 32);
437 cpu_put_cwp64(env, tstate & 0x1f);
438 __get_user(env->gregs[1], (&(*grp)[SPARC_MC_G1]));
439 __get_user(env->gregs[2], (&(*grp)[SPARC_MC_G2]));
440 __get_user(env->gregs[3], (&(*grp)[SPARC_MC_G3]));
441 __get_user(env->gregs[4], (&(*grp)[SPARC_MC_G4]));
442 __get_user(env->gregs[5], (&(*grp)[SPARC_MC_G5]));
443 __get_user(env->gregs[6], (&(*grp)[SPARC_MC_G6]));
444 __get_user(env->gregs[7], (&(*grp)[SPARC_MC_G7]));
445 __get_user(env->regwptr[WREG_O0], (&(*grp)[SPARC_MC_O0]));
446 __get_user(env->regwptr[WREG_O1], (&(*grp)[SPARC_MC_O1]));
447 __get_user(env->regwptr[WREG_O2], (&(*grp)[SPARC_MC_O2]));
448 __get_user(env->regwptr[WREG_O3], (&(*grp)[SPARC_MC_O3]));
449 __get_user(env->regwptr[WREG_O4], (&(*grp)[SPARC_MC_O4]));
450 __get_user(env->regwptr[WREG_O5], (&(*grp)[SPARC_MC_O5]));
451 __get_user(env->regwptr[WREG_O6], (&(*grp)[SPARC_MC_O6]));
452 __get_user(env->regwptr[WREG_O7], (&(*grp)[SPARC_MC_O7]));
453
454 __get_user(fp, &(ucp->tuc_mcontext.mc_fp));
455 __get_user(i7, &(ucp->tuc_mcontext.mc_i7));
456
457 w_addr = TARGET_STACK_BIAS + env->regwptr[WREG_O6];
458 if (put_user(fp, w_addr + offsetof(struct target_reg_window, ins[6]),
459 abi_ulong) != 0) {
460 goto do_sigsegv;
461 }
462 if (put_user(i7, w_addr + offsetof(struct target_reg_window, ins[7]),
463 abi_ulong) != 0) {
464 goto do_sigsegv;
465 }
466 /* FIXME this does not match how the kernel handles the FPU in
467 * its sparc64_set_context implementation. In particular the FPU
468 * is only restored if fenab is non-zero in:
469 * __get_user(fenab, &(ucp->tuc_mcontext.mc_fpregs.mcfpu_enab));
470 */
471 __get_user(env->fprs, &(ucp->tuc_mcontext.mc_fpregs.mcfpu_fprs));
472 {
473 uint32_t *src = ucp->tuc_mcontext.mc_fpregs.mcfpu_fregs.sregs;
474 for (i = 0; i < 64; i++, src++) {
475 if (i & 1) {
476 __get_user(env->fpr[i/2].l.lower, src);
477 } else {
478 __get_user(env->fpr[i/2].l.upper, src);
479 }
480 }
481 }
482 __get_user(env->fsr,
483 &(ucp->tuc_mcontext.mc_fpregs.mcfpu_fsr));
484 __get_user(env->gsr,
485 &(ucp->tuc_mcontext.mc_fpregs.mcfpu_gsr));
486 unlock_user_struct(ucp, ucp_addr, 0);
487 return;
488 do_sigsegv:
489 unlock_user_struct(ucp, ucp_addr, 0);
490 force_sig(TARGET_SIGSEGV);
491 }
492
493 void sparc64_get_context(CPUSPARCState *env)
494 {
495 abi_ulong ucp_addr;
496 struct target_ucontext *ucp;
497 target_mc_gregset_t *grp;
498 target_mcontext_t *mcp;
499 abi_ulong fp, i7, w_addr;
500 int err;
501 unsigned int i;
502 target_sigset_t target_set;
503 sigset_t set;
504
505 ucp_addr = env->regwptr[WREG_O0];
506 if (!lock_user_struct(VERIFY_WRITE, ucp, ucp_addr, 0)) {
507 goto do_sigsegv;
508 }
509
510 mcp = &ucp->tuc_mcontext;
511 grp = &mcp->mc_gregs;
512
513 /* Skip over the trap instruction, first. */
514 env->pc = env->npc;
515 env->npc += 4;
516
517 /* If we're only reading the signal mask then do_sigprocmask()
518 * is guaranteed not to fail, which is important because we don't
519 * have any way to signal a failure or restart this operation since
520 * this is not a normal syscall.
521 */
522 err = do_sigprocmask(0, NULL, &set);
523 assert(err == 0);
524 host_to_target_sigset_internal(&target_set, &set);
525 if (TARGET_NSIG_WORDS == 1) {
526 __put_user(target_set.sig[0],
527 (abi_ulong *)&ucp->tuc_sigmask);
528 } else {
529 abi_ulong *src, *dst;
530 src = target_set.sig;
531 dst = ucp->tuc_sigmask.sig;
532 for (i = 0; i < TARGET_NSIG_WORDS; i++, dst++, src++) {
533 __put_user(*src, dst);
534 }
535 if (err)
536 goto do_sigsegv;
537 }
538
539 /* XXX: tstate must be saved properly */
540 // __put_user(env->tstate, &((*grp)[SPARC_MC_TSTATE]));
541 __put_user(env->pc, &((*grp)[SPARC_MC_PC]));
542 __put_user(env->npc, &((*grp)[SPARC_MC_NPC]));
543 __put_user(env->y, &((*grp)[SPARC_MC_Y]));
544 __put_user(env->gregs[1], &((*grp)[SPARC_MC_G1]));
545 __put_user(env->gregs[2], &((*grp)[SPARC_MC_G2]));
546 __put_user(env->gregs[3], &((*grp)[SPARC_MC_G3]));
547 __put_user(env->gregs[4], &((*grp)[SPARC_MC_G4]));
548 __put_user(env->gregs[5], &((*grp)[SPARC_MC_G5]));
549 __put_user(env->gregs[6], &((*grp)[SPARC_MC_G6]));
550 __put_user(env->gregs[7], &((*grp)[SPARC_MC_G7]));
551 __put_user(env->regwptr[WREG_O0], &((*grp)[SPARC_MC_O0]));
552 __put_user(env->regwptr[WREG_O1], &((*grp)[SPARC_MC_O1]));
553 __put_user(env->regwptr[WREG_O2], &((*grp)[SPARC_MC_O2]));
554 __put_user(env->regwptr[WREG_O3], &((*grp)[SPARC_MC_O3]));
555 __put_user(env->regwptr[WREG_O4], &((*grp)[SPARC_MC_O4]));
556 __put_user(env->regwptr[WREG_O5], &((*grp)[SPARC_MC_O5]));
557 __put_user(env->regwptr[WREG_O6], &((*grp)[SPARC_MC_O6]));
558 __put_user(env->regwptr[WREG_O7], &((*grp)[SPARC_MC_O7]));
559
560 w_addr = TARGET_STACK_BIAS + env->regwptr[WREG_O6];
561 fp = i7 = 0;
562 if (get_user(fp, w_addr + offsetof(struct target_reg_window, ins[6]),
563 abi_ulong) != 0) {
564 goto do_sigsegv;
565 }
566 if (get_user(i7, w_addr + offsetof(struct target_reg_window, ins[7]),
567 abi_ulong) != 0) {
568 goto do_sigsegv;
569 }
570 __put_user(fp, &(mcp->mc_fp));
571 __put_user(i7, &(mcp->mc_i7));
572
573 {
574 uint32_t *dst = ucp->tuc_mcontext.mc_fpregs.mcfpu_fregs.sregs;
575 for (i = 0; i < 64; i++, dst++) {
576 if (i & 1) {
577 __put_user(env->fpr[i/2].l.lower, dst);
578 } else {
579 __put_user(env->fpr[i/2].l.upper, dst);
580 }
581 }
582 }
583 __put_user(env->fsr, &(mcp->mc_fpregs.mcfpu_fsr));
584 __put_user(env->gsr, &(mcp->mc_fpregs.mcfpu_gsr));
585 __put_user(env->fprs, &(mcp->mc_fpregs.mcfpu_fprs));
586
587 if (err)
588 goto do_sigsegv;
589 unlock_user_struct(ucp, ucp_addr, 1);
590 return;
591 do_sigsegv:
592 unlock_user_struct(ucp, ucp_addr, 1);
593 force_sig(TARGET_SIGSEGV);
594 }
595 #endif