1 // SPDX-License-Identifier: GPL-2.0 2 /* arch/sparc64/kernel/signal32.c 3 * 4 * Copyright (C) 1991, 1992 Linus Torvalds 5 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) 6 * Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx) 7 * Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be) 8 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) 9 */ 10 11 #include <linux/sched.h> 12 #include <linux/kernel.h> 13 #include <linux/signal.h> 14 #include <linux/errno.h> 15 #include <linux/wait.h> 16 #include <linux/ptrace.h> 17 #include <linux/unistd.h> 18 #include <linux/mm.h> 19 #include <linux/tty.h> 20 #include <linux/binfmts.h> 21 #include <linux/compat.h> 22 #include <linux/bitops.h> 23 #include <linux/tracehook.h> 24 25 #include <linux/uaccess.h> 26 #include <asm/ptrace.h> 27 #include <asm/pgtable.h> 28 #include <asm/psrcompat.h> 29 #include <asm/fpumacro.h> 30 #include <asm/visasm.h> 31 #include <asm/compat_signal.h> 32 #include <asm/switch_to.h> 33 34 #include "sigutil.h" 35 #include "kernel.h" 36 37 /* This magic should be in g_upper[0] for all upper parts 38 * to be valid. 39 */ 40 #define SIGINFO_EXTRA_V8PLUS_MAGIC 0x130e269 41 typedef struct { 42 unsigned int g_upper[8]; 43 unsigned int o_upper[8]; 44 unsigned int asi; 45 } siginfo_extra_v8plus_t; 46 47 struct signal_frame32 { 48 struct sparc_stackf32 ss; 49 __siginfo32_t info; 50 /* __siginfo_fpu_t * */ u32 fpu_save; 51 unsigned int insns[2]; 52 unsigned int extramask[_COMPAT_NSIG_WORDS - 1]; 53 unsigned int extra_size; /* Should be sizeof(siginfo_extra_v8plus_t) */ 54 /* Only valid if (info.si_regs.psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS */ 55 siginfo_extra_v8plus_t v8plus; 56 /* __siginfo_rwin_t * */u32 rwin_save; 57 } __attribute__((aligned(8))); 58 59 struct rt_signal_frame32 { 60 struct sparc_stackf32 ss; 61 compat_siginfo_t info; 62 struct pt_regs32 regs; 63 compat_sigset_t mask; 64 /* __siginfo_fpu_t * */ u32 fpu_save; 65 unsigned int insns[2]; 66 compat_stack_t stack; 67 unsigned int extra_size; /* Should be sizeof(siginfo_extra_v8plus_t) */ 68 /* Only valid if (regs.psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS */ 69 siginfo_extra_v8plus_t v8plus; 70 /* __siginfo_rwin_t * */u32 rwin_save; 71 } __attribute__((aligned(8))); 72 73 /* Checks if the fp is valid. We always build signal frames which are 74 * 16-byte aligned, therefore we can always enforce that the restore 75 * frame has that property as well. 76 */ 77 static bool invalid_frame_pointer(void __user *fp, int fplen) 78 { 79 if ((((unsigned long) fp) & 15) || 80 ((unsigned long)fp) > 0x100000000ULL - fplen) 81 return true; 82 return false; 83 } 84 85 void do_sigreturn32(struct pt_regs *regs) 86 { 87 struct signal_frame32 __user *sf; 88 compat_uptr_t fpu_save; 89 compat_uptr_t rwin_save; 90 unsigned int psr, ufp; 91 unsigned int pc, npc; 92 sigset_t set; 93 compat_sigset_t seta; 94 int err, i; 95 96 /* Always make any pending restarted system calls return -EINTR */ 97 current->restart_block.fn = do_no_restart_syscall; 98 99 synchronize_user_stack(); 100 101 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; 102 sf = (struct signal_frame32 __user *) regs->u_regs[UREG_FP]; 103 104 /* 1. Make sure we are not getting garbage from the user */ 105 if (invalid_frame_pointer(sf, sizeof(*sf))) 106 goto segv; 107 108 if (get_user(ufp, &sf->info.si_regs.u_regs[UREG_FP])) 109 goto segv; 110 111 if (ufp & 0x7) 112 goto segv; 113 114 if (__get_user(pc, &sf->info.si_regs.pc) || 115 __get_user(npc, &sf->info.si_regs.npc)) 116 goto segv; 117 118 if ((pc | npc) & 3) 119 goto segv; 120 121 if (test_thread_flag(TIF_32BIT)) { 122 pc &= 0xffffffff; 123 npc &= 0xffffffff; 124 } 125 regs->tpc = pc; 126 regs->tnpc = npc; 127 128 /* 2. Restore the state */ 129 err = __get_user(regs->y, &sf->info.si_regs.y); 130 err |= __get_user(psr, &sf->info.si_regs.psr); 131 132 for (i = UREG_G1; i <= UREG_I7; i++) 133 err |= __get_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]); 134 if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) { 135 err |= __get_user(i, &sf->v8plus.g_upper[0]); 136 if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) { 137 unsigned long asi; 138 139 for (i = UREG_G1; i <= UREG_I7; i++) 140 err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]); 141 err |= __get_user(asi, &sf->v8plus.asi); 142 regs->tstate &= ~TSTATE_ASI; 143 regs->tstate |= ((asi & 0xffUL) << 24UL); 144 } 145 } 146 147 /* User can only change condition codes in %tstate. */ 148 regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC); 149 regs->tstate |= psr_to_tstate_icc(psr); 150 151 /* Prevent syscall restart. */ 152 pt_regs_clear_syscall(regs); 153 154 err |= __get_user(fpu_save, &sf->fpu_save); 155 if (!err && fpu_save) 156 err |= restore_fpu_state(regs, compat_ptr(fpu_save)); 157 err |= __get_user(rwin_save, &sf->rwin_save); 158 if (!err && rwin_save) { 159 if (restore_rwin_state(compat_ptr(rwin_save))) 160 goto segv; 161 } 162 err |= __get_user(seta.sig[0], &sf->info.si_mask); 163 err |= copy_from_user(&seta.sig[1], &sf->extramask, 164 (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int)); 165 if (err) 166 goto segv; 167 168 set.sig[0] = seta.sig[0] + (((long)seta.sig[1]) << 32); 169 set_current_blocked(&set); 170 return; 171 172 segv: 173 force_sig(SIGSEGV); 174 } 175 176 asmlinkage void do_rt_sigreturn32(struct pt_regs *regs) 177 { 178 struct rt_signal_frame32 __user *sf; 179 unsigned int psr, pc, npc, ufp; 180 compat_uptr_t fpu_save; 181 compat_uptr_t rwin_save; 182 sigset_t set; 183 int err, i; 184 185 /* Always make any pending restarted system calls return -EINTR */ 186 current->restart_block.fn = do_no_restart_syscall; 187 188 synchronize_user_stack(); 189 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; 190 sf = (struct rt_signal_frame32 __user *) regs->u_regs[UREG_FP]; 191 192 /* 1. Make sure we are not getting garbage from the user */ 193 if (invalid_frame_pointer(sf, sizeof(*sf))) 194 goto segv; 195 196 if (get_user(ufp, &sf->regs.u_regs[UREG_FP])) 197 goto segv; 198 199 if (ufp & 0x7) 200 goto segv; 201 202 if (__get_user(pc, &sf->regs.pc) || 203 __get_user(npc, &sf->regs.npc)) 204 goto segv; 205 206 if ((pc | npc) & 3) 207 goto segv; 208 209 if (test_thread_flag(TIF_32BIT)) { 210 pc &= 0xffffffff; 211 npc &= 0xffffffff; 212 } 213 regs->tpc = pc; 214 regs->tnpc = npc; 215 216 /* 2. Restore the state */ 217 err = __get_user(regs->y, &sf->regs.y); 218 err |= __get_user(psr, &sf->regs.psr); 219 220 for (i = UREG_G1; i <= UREG_I7; i++) 221 err |= __get_user(regs->u_regs[i], &sf->regs.u_regs[i]); 222 if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) { 223 err |= __get_user(i, &sf->v8plus.g_upper[0]); 224 if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) { 225 unsigned long asi; 226 227 for (i = UREG_G1; i <= UREG_I7; i++) 228 err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]); 229 err |= __get_user(asi, &sf->v8plus.asi); 230 regs->tstate &= ~TSTATE_ASI; 231 regs->tstate |= ((asi & 0xffUL) << 24UL); 232 } 233 } 234 235 /* User can only change condition codes in %tstate. */ 236 regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC); 237 regs->tstate |= psr_to_tstate_icc(psr); 238 239 /* Prevent syscall restart. */ 240 pt_regs_clear_syscall(regs); 241 242 err |= __get_user(fpu_save, &sf->fpu_save); 243 if (!err && fpu_save) 244 err |= restore_fpu_state(regs, compat_ptr(fpu_save)); 245 err |= get_compat_sigset(&set, &sf->mask); 246 err |= compat_restore_altstack(&sf->stack); 247 if (err) 248 goto segv; 249 250 err |= __get_user(rwin_save, &sf->rwin_save); 251 if (!err && rwin_save) { 252 if (restore_rwin_state(compat_ptr(rwin_save))) 253 goto segv; 254 } 255 256 set_current_blocked(&set); 257 return; 258 segv: 259 force_sig(SIGSEGV); 260 } 261 262 static void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs, unsigned long framesize) 263 { 264 unsigned long sp; 265 266 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; 267 sp = regs->u_regs[UREG_FP]; 268 269 /* 270 * If we are on the alternate signal stack and would overflow it, don't. 271 * Return an always-bogus address instead so we will die with SIGSEGV. 272 */ 273 if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize))) 274 return (void __user *) -1L; 275 276 /* This is the X/Open sanctioned signal stack switching. */ 277 sp = sigsp(sp, ksig) - framesize; 278 279 /* Always align the stack frame. This handles two cases. First, 280 * sigaltstack need not be mindful of platform specific stack 281 * alignment. Second, if we took this signal because the stack 282 * is not aligned properly, we'd like to take the signal cleanly 283 * and report that. 284 */ 285 sp &= ~15UL; 286 287 return (void __user *) sp; 288 } 289 290 /* The I-cache flush instruction only works in the primary ASI, which 291 * right now is the nucleus, aka. kernel space. 292 * 293 * Therefore we have to kick the instructions out using the kernel 294 * side linear mapping of the physical address backing the user 295 * instructions. 296 */ 297 static void flush_signal_insns(unsigned long address) 298 { 299 unsigned long pstate, paddr; 300 pte_t *ptep, pte; 301 pgd_t *pgdp; 302 p4d_t *p4dp; 303 pud_t *pudp; 304 pmd_t *pmdp; 305 306 /* Commit all stores of the instructions we are about to flush. */ 307 wmb(); 308 309 /* Disable cross-call reception. In this way even a very wide 310 * munmap() on another cpu can't tear down the page table 311 * hierarchy from underneath us, since that can't complete 312 * until the IPI tlb flush returns. 313 */ 314 315 __asm__ __volatile__("rdpr %%pstate, %0" : "=r" (pstate)); 316 __asm__ __volatile__("wrpr %0, %1, %%pstate" 317 : : "r" (pstate), "i" (PSTATE_IE)); 318 319 pgdp = pgd_offset(current->mm, address); 320 if (pgd_none(*pgdp)) 321 goto out_irqs_on; 322 p4dp = p4d_offset(pgdp, address); 323 if (p4d_none(*p4dp)) 324 goto out_irqs_on; 325 pudp = pud_offset(p4dp, address); 326 if (pud_none(*pudp)) 327 goto out_irqs_on; 328 pmdp = pmd_offset(pudp, address); 329 if (pmd_none(*pmdp)) 330 goto out_irqs_on; 331 332 ptep = pte_offset_map(pmdp, address); 333 pte = *ptep; 334 if (!pte_present(pte)) 335 goto out_unmap; 336 337 paddr = (unsigned long) page_address(pte_page(pte)); 338 339 __asm__ __volatile__("flush %0 + %1" 340 : /* no outputs */ 341 : "r" (paddr), 342 "r" (address & (PAGE_SIZE - 1)) 343 : "memory"); 344 345 out_unmap: 346 pte_unmap(ptep); 347 out_irqs_on: 348 __asm__ __volatile__("wrpr %0, 0x0, %%pstate" : : "r" (pstate)); 349 350 } 351 352 static int setup_frame32(struct ksignal *ksig, struct pt_regs *regs, 353 sigset_t *oldset) 354 { 355 struct signal_frame32 __user *sf; 356 int i, err, wsaved; 357 void __user *tail; 358 int sigframe_size; 359 u32 psr; 360 compat_sigset_t seta; 361 362 /* 1. Make sure everything is clean */ 363 synchronize_user_stack(); 364 save_and_clear_fpu(); 365 366 wsaved = get_thread_wsaved(); 367 368 sigframe_size = sizeof(*sf); 369 if (current_thread_info()->fpsaved[0] & FPRS_FEF) 370 sigframe_size += sizeof(__siginfo_fpu_t); 371 if (wsaved) 372 sigframe_size += sizeof(__siginfo_rwin_t); 373 374 sf = (struct signal_frame32 __user *) 375 get_sigframe(ksig, regs, sigframe_size); 376 377 if (invalid_frame_pointer(sf, sigframe_size)) { 378 if (show_unhandled_signals) 379 pr_info("%s[%d] bad frame in setup_frame32: %08lx TPC %08lx O7 %08lx\n", 380 current->comm, current->pid, (unsigned long)sf, 381 regs->tpc, regs->u_regs[UREG_I7]); 382 force_sigsegv(ksig->sig); 383 return -EINVAL; 384 } 385 386 tail = (sf + 1); 387 388 /* 2. Save the current process state */ 389 if (test_thread_flag(TIF_32BIT)) { 390 regs->tpc &= 0xffffffff; 391 regs->tnpc &= 0xffffffff; 392 } 393 err = put_user(regs->tpc, &sf->info.si_regs.pc); 394 err |= __put_user(regs->tnpc, &sf->info.si_regs.npc); 395 err |= __put_user(regs->y, &sf->info.si_regs.y); 396 psr = tstate_to_psr(regs->tstate); 397 if (current_thread_info()->fpsaved[0] & FPRS_FEF) 398 psr |= PSR_EF; 399 err |= __put_user(psr, &sf->info.si_regs.psr); 400 for (i = 0; i < 16; i++) 401 err |= __put_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]); 402 err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size); 403 err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]); 404 for (i = 1; i < 16; i++) 405 err |= __put_user(((u32 *)regs->u_regs)[2*i], 406 &sf->v8plus.g_upper[i]); 407 err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL, 408 &sf->v8plus.asi); 409 410 if (psr & PSR_EF) { 411 __siginfo_fpu_t __user *fp = tail; 412 tail += sizeof(*fp); 413 err |= save_fpu_state(regs, fp); 414 err |= __put_user((u64)fp, &sf->fpu_save); 415 } else { 416 err |= __put_user(0, &sf->fpu_save); 417 } 418 if (wsaved) { 419 __siginfo_rwin_t __user *rwp = tail; 420 tail += sizeof(*rwp); 421 err |= save_rwin_state(wsaved, rwp); 422 err |= __put_user((u64)rwp, &sf->rwin_save); 423 set_thread_wsaved(0); 424 } else { 425 err |= __put_user(0, &sf->rwin_save); 426 } 427 428 /* If these change we need to know - assignments to seta relies on these sizes */ 429 BUILD_BUG_ON(_NSIG_WORDS != 1); 430 BUILD_BUG_ON(_COMPAT_NSIG_WORDS != 2); 431 seta.sig[1] = (oldset->sig[0] >> 32); 432 seta.sig[0] = oldset->sig[0]; 433 434 err |= __put_user(seta.sig[0], &sf->info.si_mask); 435 err |= __copy_to_user(sf->extramask, &seta.sig[1], 436 (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int)); 437 438 if (!wsaved) { 439 err |= copy_in_user((u32 __user *)sf, 440 (u32 __user *)(regs->u_regs[UREG_FP]), 441 sizeof(struct reg_window32)); 442 } else { 443 struct reg_window *rp; 444 445 rp = ¤t_thread_info()->reg_window[wsaved - 1]; 446 for (i = 0; i < 8; i++) 447 err |= __put_user(rp->locals[i], &sf->ss.locals[i]); 448 for (i = 0; i < 6; i++) 449 err |= __put_user(rp->ins[i], &sf->ss.ins[i]); 450 err |= __put_user(rp->ins[6], &sf->ss.fp); 451 err |= __put_user(rp->ins[7], &sf->ss.callers_pc); 452 } 453 if (err) 454 return err; 455 456 /* 3. signal handler back-trampoline and parameters */ 457 regs->u_regs[UREG_FP] = (unsigned long) sf; 458 regs->u_regs[UREG_I0] = ksig->sig; 459 regs->u_regs[UREG_I1] = (unsigned long) &sf->info; 460 regs->u_regs[UREG_I2] = (unsigned long) &sf->info; 461 462 /* 4. signal handler */ 463 regs->tpc = (unsigned long) ksig->ka.sa.sa_handler; 464 regs->tnpc = (regs->tpc + 4); 465 if (test_thread_flag(TIF_32BIT)) { 466 regs->tpc &= 0xffffffff; 467 regs->tnpc &= 0xffffffff; 468 } 469 470 /* 5. return to kernel instructions */ 471 if (ksig->ka.ka_restorer) { 472 regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer; 473 } else { 474 unsigned long address = ((unsigned long)&(sf->insns[0])); 475 476 regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2); 477 478 err = __put_user(0x821020d8, &sf->insns[0]); /*mov __NR_sigreturn, %g1*/ 479 err |= __put_user(0x91d02010, &sf->insns[1]); /*t 0x10*/ 480 if (err) 481 return err; 482 flush_signal_insns(address); 483 } 484 return 0; 485 } 486 487 static int setup_rt_frame32(struct ksignal *ksig, struct pt_regs *regs, 488 sigset_t *oldset) 489 { 490 struct rt_signal_frame32 __user *sf; 491 int i, err, wsaved; 492 void __user *tail; 493 int sigframe_size; 494 u32 psr; 495 496 /* 1. Make sure everything is clean */ 497 synchronize_user_stack(); 498 save_and_clear_fpu(); 499 500 wsaved = get_thread_wsaved(); 501 502 sigframe_size = sizeof(*sf); 503 if (current_thread_info()->fpsaved[0] & FPRS_FEF) 504 sigframe_size += sizeof(__siginfo_fpu_t); 505 if (wsaved) 506 sigframe_size += sizeof(__siginfo_rwin_t); 507 508 sf = (struct rt_signal_frame32 __user *) 509 get_sigframe(ksig, regs, sigframe_size); 510 511 if (invalid_frame_pointer(sf, sigframe_size)) { 512 if (show_unhandled_signals) 513 pr_info("%s[%d] bad frame in setup_rt_frame32: %08lx TPC %08lx O7 %08lx\n", 514 current->comm, current->pid, (unsigned long)sf, 515 regs->tpc, regs->u_regs[UREG_I7]); 516 force_sigsegv(ksig->sig); 517 return -EINVAL; 518 } 519 520 tail = (sf + 1); 521 522 /* 2. Save the current process state */ 523 if (test_thread_flag(TIF_32BIT)) { 524 regs->tpc &= 0xffffffff; 525 regs->tnpc &= 0xffffffff; 526 } 527 err = put_user(regs->tpc, &sf->regs.pc); 528 err |= __put_user(regs->tnpc, &sf->regs.npc); 529 err |= __put_user(regs->y, &sf->regs.y); 530 psr = tstate_to_psr(regs->tstate); 531 if (current_thread_info()->fpsaved[0] & FPRS_FEF) 532 psr |= PSR_EF; 533 err |= __put_user(psr, &sf->regs.psr); 534 for (i = 0; i < 16; i++) 535 err |= __put_user(regs->u_regs[i], &sf->regs.u_regs[i]); 536 err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size); 537 err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]); 538 for (i = 1; i < 16; i++) 539 err |= __put_user(((u32 *)regs->u_regs)[2*i], 540 &sf->v8plus.g_upper[i]); 541 err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL, 542 &sf->v8plus.asi); 543 544 if (psr & PSR_EF) { 545 __siginfo_fpu_t __user *fp = tail; 546 tail += sizeof(*fp); 547 err |= save_fpu_state(regs, fp); 548 err |= __put_user((u64)fp, &sf->fpu_save); 549 } else { 550 err |= __put_user(0, &sf->fpu_save); 551 } 552 if (wsaved) { 553 __siginfo_rwin_t __user *rwp = tail; 554 tail += sizeof(*rwp); 555 err |= save_rwin_state(wsaved, rwp); 556 err |= __put_user((u64)rwp, &sf->rwin_save); 557 set_thread_wsaved(0); 558 } else { 559 err |= __put_user(0, &sf->rwin_save); 560 } 561 562 /* Update the siginfo structure. */ 563 err |= copy_siginfo_to_user32(&sf->info, &ksig->info); 564 565 /* Setup sigaltstack */ 566 err |= __compat_save_altstack(&sf->stack, regs->u_regs[UREG_FP]); 567 568 err |= put_compat_sigset(&sf->mask, oldset, sizeof(compat_sigset_t)); 569 570 if (!wsaved) { 571 err |= copy_in_user((u32 __user *)sf, 572 (u32 __user *)(regs->u_regs[UREG_FP]), 573 sizeof(struct reg_window32)); 574 } else { 575 struct reg_window *rp; 576 577 rp = ¤t_thread_info()->reg_window[wsaved - 1]; 578 for (i = 0; i < 8; i++) 579 err |= __put_user(rp->locals[i], &sf->ss.locals[i]); 580 for (i = 0; i < 6; i++) 581 err |= __put_user(rp->ins[i], &sf->ss.ins[i]); 582 err |= __put_user(rp->ins[6], &sf->ss.fp); 583 err |= __put_user(rp->ins[7], &sf->ss.callers_pc); 584 } 585 if (err) 586 return err; 587 588 /* 3. signal handler back-trampoline and parameters */ 589 regs->u_regs[UREG_FP] = (unsigned long) sf; 590 regs->u_regs[UREG_I0] = ksig->sig; 591 regs->u_regs[UREG_I1] = (unsigned long) &sf->info; 592 regs->u_regs[UREG_I2] = (unsigned long) &sf->regs; 593 594 /* 4. signal handler */ 595 regs->tpc = (unsigned long) ksig->ka.sa.sa_handler; 596 regs->tnpc = (regs->tpc + 4); 597 if (test_thread_flag(TIF_32BIT)) { 598 regs->tpc &= 0xffffffff; 599 regs->tnpc &= 0xffffffff; 600 } 601 602 /* 5. return to kernel instructions */ 603 if (ksig->ka.ka_restorer) 604 regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer; 605 else { 606 unsigned long address = ((unsigned long)&(sf->insns[0])); 607 608 regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2); 609 610 /* mov __NR_rt_sigreturn, %g1 */ 611 err |= __put_user(0x82102065, &sf->insns[0]); 612 613 /* t 0x10 */ 614 err |= __put_user(0x91d02010, &sf->insns[1]); 615 if (err) 616 return err; 617 618 flush_signal_insns(address); 619 } 620 return 0; 621 } 622 623 static inline void handle_signal32(struct ksignal *ksig, 624 struct pt_regs *regs) 625 { 626 sigset_t *oldset = sigmask_to_save(); 627 int err; 628 629 if (ksig->ka.sa.sa_flags & SA_SIGINFO) 630 err = setup_rt_frame32(ksig, regs, oldset); 631 else 632 err = setup_frame32(ksig, regs, oldset); 633 634 signal_setup_done(err, ksig, 0); 635 } 636 637 static inline void syscall_restart32(unsigned long orig_i0, struct pt_regs *regs, 638 struct sigaction *sa) 639 { 640 switch (regs->u_regs[UREG_I0]) { 641 case ERESTART_RESTARTBLOCK: 642 case ERESTARTNOHAND: 643 no_system_call_restart: 644 regs->u_regs[UREG_I0] = EINTR; 645 regs->tstate |= TSTATE_ICARRY; 646 break; 647 case ERESTARTSYS: 648 if (!(sa->sa_flags & SA_RESTART)) 649 goto no_system_call_restart; 650 /* fallthrough */ 651 case ERESTARTNOINTR: 652 regs->u_regs[UREG_I0] = orig_i0; 653 regs->tpc -= 4; 654 regs->tnpc -= 4; 655 } 656 } 657 658 /* Note that 'init' is a special process: it doesn't get signals it doesn't 659 * want to handle. Thus you cannot kill init even with a SIGKILL even by 660 * mistake. 661 */ 662 void do_signal32(struct pt_regs * regs) 663 { 664 struct ksignal ksig; 665 unsigned long orig_i0 = 0; 666 int restart_syscall = 0; 667 bool has_handler = get_signal(&ksig); 668 669 if (pt_regs_is_syscall(regs) && 670 (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) { 671 restart_syscall = 1; 672 orig_i0 = regs->u_regs[UREG_G6]; 673 } 674 675 if (has_handler) { 676 if (restart_syscall) 677 syscall_restart32(orig_i0, regs, &ksig.ka.sa); 678 handle_signal32(&ksig, regs); 679 } else { 680 if (restart_syscall) { 681 switch (regs->u_regs[UREG_I0]) { 682 case ERESTARTNOHAND: 683 case ERESTARTSYS: 684 case ERESTARTNOINTR: 685 /* replay the system call when we are done */ 686 regs->u_regs[UREG_I0] = orig_i0; 687 regs->tpc -= 4; 688 regs->tnpc -= 4; 689 pt_regs_clear_syscall(regs); 690 /* fall through */ 691 case ERESTART_RESTARTBLOCK: 692 regs->u_regs[UREG_G1] = __NR_restart_syscall; 693 regs->tpc -= 4; 694 regs->tnpc -= 4; 695 pt_regs_clear_syscall(regs); 696 } 697 } 698 restore_saved_sigmask(); 699 } 700 } 701 702 struct sigstack32 { 703 u32 the_stack; 704 int cur_status; 705 }; 706 707 asmlinkage int do_sys32_sigstack(u32 u_ssptr, u32 u_ossptr, unsigned long sp) 708 { 709 struct sigstack32 __user *ssptr = 710 (struct sigstack32 __user *)((unsigned long)(u_ssptr)); 711 struct sigstack32 __user *ossptr = 712 (struct sigstack32 __user *)((unsigned long)(u_ossptr)); 713 int ret = -EFAULT; 714 715 /* First see if old state is wanted. */ 716 if (ossptr) { 717 if (put_user(current->sas_ss_sp + current->sas_ss_size, 718 &ossptr->the_stack) || 719 __put_user(on_sig_stack(sp), &ossptr->cur_status)) 720 goto out; 721 } 722 723 /* Now see if we want to update the new state. */ 724 if (ssptr) { 725 u32 ss_sp; 726 727 if (get_user(ss_sp, &ssptr->the_stack)) 728 goto out; 729 730 /* If the current stack was set with sigaltstack, don't 731 * swap stacks while we are on it. 732 */ 733 ret = -EPERM; 734 if (current->sas_ss_sp && on_sig_stack(sp)) 735 goto out; 736 737 /* Since we don't know the extent of the stack, and we don't 738 * track onstack-ness, but rather calculate it, we must 739 * presume a size. Ho hum this interface is lossy. 740 */ 741 current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ; 742 current->sas_ss_size = SIGSTKSZ; 743 } 744 745 ret = 0; 746 out: 747 return ret; 748 } 749