1/* arch/sparc64/kernel/signal32.c 2 * 3 * Copyright (C) 1991, 1992 Linus Torvalds 4 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) 5 * Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx) 6 * Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be) 7 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) 8 */ 9 10#include <linux/sched.h> 11#include <linux/kernel.h> 12#include <linux/signal.h> 13#include <linux/errno.h> 14#include <linux/wait.h> 15#include <linux/ptrace.h> 16#include <linux/unistd.h> 17#include <linux/mm.h> 18#include <linux/tty.h> 19#include <linux/binfmts.h> 20#include <linux/compat.h> 21#include <linux/bitops.h> 22#include <linux/tracehook.h> 23 24#include <asm/uaccess.h> 25#include <asm/ptrace.h> 26#include <asm/pgtable.h> 27#include <asm/psrcompat.h> 28#include <asm/fpumacro.h> 29#include <asm/visasm.h> 30#include <asm/compat_signal.h> 31#include <asm/switch_to.h> 32 33#include "sigutil.h" 34#include "kernel.h" 35 36/* This magic should be in g_upper[0] for all upper parts 37 * to be valid. 38 */ 39#define SIGINFO_EXTRA_V8PLUS_MAGIC 0x130e269 40typedef struct { 41 unsigned int g_upper[8]; 42 unsigned int o_upper[8]; 43 unsigned int asi; 44} siginfo_extra_v8plus_t; 45 46struct signal_frame32 { 47 struct sparc_stackf32 ss; 48 __siginfo32_t info; 49 /* __siginfo_fpu_t * */ u32 fpu_save; 50 unsigned int insns[2]; 51 unsigned int extramask[_COMPAT_NSIG_WORDS - 1]; 52 unsigned int extra_size; /* Should be sizeof(siginfo_extra_v8plus_t) */ 53 /* Only valid if (info.si_regs.psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS */ 54 siginfo_extra_v8plus_t v8plus; 55 /* __siginfo_rwin_t * */u32 rwin_save; 56} __attribute__((aligned(8))); 57 58struct rt_signal_frame32 { 59 struct sparc_stackf32 ss; 60 compat_siginfo_t info; 61 struct pt_regs32 regs; 62 compat_sigset_t mask; 63 /* __siginfo_fpu_t * */ u32 fpu_save; 64 unsigned int insns[2]; 65 compat_stack_t stack; 66 unsigned int extra_size; /* Should be sizeof(siginfo_extra_v8plus_t) */ 67 /* Only valid if (regs.psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS */ 68 siginfo_extra_v8plus_t v8plus; 69 /* __siginfo_rwin_t * */u32 rwin_save; 70} __attribute__((aligned(8))); 71 72int copy_siginfo_to_user32(compat_siginfo_t __user *to, const siginfo_t *from) 73{ 74 int err; 75 76 if (!access_ok(VERIFY_WRITE, to, sizeof(compat_siginfo_t))) 77 return -EFAULT; 78 79 /* If you change siginfo_t structure, please be sure 80 this code is fixed accordingly. 81 It should never copy any pad contained in the structure 82 to avoid security leaks, but must copy the generic 83 3 ints plus the relevant union member. 84 This routine must convert siginfo from 64bit to 32bit as well 85 at the same time. */ 86 err = __put_user(from->si_signo, &to->si_signo); 87 err |= __put_user(from->si_errno, &to->si_errno); 88 err |= __put_user((short)from->si_code, &to->si_code); 89 if (from->si_code < 0) 90 err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE); 91 else { 92 switch (from->si_code >> 16) { 93 case __SI_TIMER >> 16: 94 err |= __put_user(from->si_tid, &to->si_tid); 95 err |= __put_user(from->si_overrun, &to->si_overrun); 96 err |= __put_user(from->si_int, &to->si_int); 97 break; 98 case __SI_CHLD >> 16: 99 err |= __put_user(from->si_utime, &to->si_utime); 100 err |= __put_user(from->si_stime, &to->si_stime); 101 err |= __put_user(from->si_status, &to->si_status); 102 default: 103 err |= __put_user(from->si_pid, &to->si_pid); 104 err |= __put_user(from->si_uid, &to->si_uid); 105 break; 106 case __SI_FAULT >> 16: 107 err |= __put_user(from->si_trapno, &to->si_trapno); 108 err |= __put_user((unsigned long)from->si_addr, &to->si_addr); 109 break; 110 case __SI_POLL >> 16: 111 err |= __put_user(from->si_band, &to->si_band); 112 err |= __put_user(from->si_fd, &to->si_fd); 113 break; 114 case __SI_RT >> 16: /* This is not generated by the kernel as of now. */ 115 case __SI_MESGQ >> 16: 116 err |= __put_user(from->si_pid, &to->si_pid); 117 err |= __put_user(from->si_uid, &to->si_uid); 118 err |= __put_user(from->si_int, &to->si_int); 119 break; 120 } 121 } 122 return err; 123} 124 125/* CAUTION: This is just a very minimalist implementation for the 126 * sake of compat_sys_rt_sigqueueinfo() 127 */ 128int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from) 129{ 130 if (!access_ok(VERIFY_WRITE, from, sizeof(compat_siginfo_t))) 131 return -EFAULT; 132 133 if (copy_from_user(to, from, 3*sizeof(int)) || 134 copy_from_user(to->_sifields._pad, from->_sifields._pad, 135 SI_PAD_SIZE)) 136 return -EFAULT; 137 138 return 0; 139} 140 141void do_sigreturn32(struct pt_regs *regs) 142{ 143 struct signal_frame32 __user *sf; 144 compat_uptr_t fpu_save; 145 compat_uptr_t rwin_save; 146 unsigned int psr; 147 unsigned pc, npc; 148 sigset_t set; 149 compat_sigset_t seta; 150 int err, i; 151 152 /* Always make any pending restarted system calls return -EINTR */ 153 current->restart_block.fn = do_no_restart_syscall; 154 155 synchronize_user_stack(); 156 157 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; 158 sf = (struct signal_frame32 __user *) regs->u_regs[UREG_FP]; 159 160 /* 1. Make sure we are not getting garbage from the user */ 161 if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) || 162 (((unsigned long) sf) & 3)) 163 goto segv; 164 165 if (get_user(pc, &sf->info.si_regs.pc) || 166 __get_user(npc, &sf->info.si_regs.npc)) 167 goto segv; 168 169 if ((pc | npc) & 3) 170 goto segv; 171 172 if (test_thread_flag(TIF_32BIT)) { 173 pc &= 0xffffffff; 174 npc &= 0xffffffff; 175 } 176 regs->tpc = pc; 177 regs->tnpc = npc; 178 179 /* 2. Restore the state */ 180 err = __get_user(regs->y, &sf->info.si_regs.y); 181 err |= __get_user(psr, &sf->info.si_regs.psr); 182 183 for (i = UREG_G1; i <= UREG_I7; i++) 184 err |= __get_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]); 185 if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) { 186 err |= __get_user(i, &sf->v8plus.g_upper[0]); 187 if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) { 188 unsigned long asi; 189 190 for (i = UREG_G1; i <= UREG_I7; i++) 191 err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]); 192 err |= __get_user(asi, &sf->v8plus.asi); 193 regs->tstate &= ~TSTATE_ASI; 194 regs->tstate |= ((asi & 0xffUL) << 24UL); 195 } 196 } 197 198 /* User can only change condition codes in %tstate. */ 199 regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC); 200 regs->tstate |= psr_to_tstate_icc(psr); 201 202 /* Prevent syscall restart. */ 203 pt_regs_clear_syscall(regs); 204 205 err |= __get_user(fpu_save, &sf->fpu_save); 206 if (!err && fpu_save) 207 err |= restore_fpu_state(regs, compat_ptr(fpu_save)); 208 err |= __get_user(rwin_save, &sf->rwin_save); 209 if (!err && rwin_save) { 210 if (restore_rwin_state(compat_ptr(rwin_save))) 211 goto segv; 212 } 213 err |= __get_user(seta.sig[0], &sf->info.si_mask); 214 err |= copy_from_user(&seta.sig[1], &sf->extramask, 215 (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int)); 216 if (err) 217 goto segv; 218 219 set.sig[0] = seta.sig[0] + (((long)seta.sig[1]) << 32); 220 set_current_blocked(&set); 221 return; 222 223segv: 224 force_sig(SIGSEGV, current); 225} 226 227asmlinkage void do_rt_sigreturn32(struct pt_regs *regs) 228{ 229 struct rt_signal_frame32 __user *sf; 230 unsigned int psr, pc, npc; 231 compat_uptr_t fpu_save; 232 compat_uptr_t rwin_save; 233 sigset_t set; 234 compat_sigset_t seta; 235 int err, i; 236 237 /* Always make any pending restarted system calls return -EINTR */ 238 current->restart_block.fn = do_no_restart_syscall; 239 240 synchronize_user_stack(); 241 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; 242 sf = (struct rt_signal_frame32 __user *) regs->u_regs[UREG_FP]; 243 244 /* 1. Make sure we are not getting garbage from the user */ 245 if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) || 246 (((unsigned long) sf) & 3)) 247 goto segv; 248 249 if (get_user(pc, &sf->regs.pc) || 250 __get_user(npc, &sf->regs.npc)) 251 goto segv; 252 253 if ((pc | npc) & 3) 254 goto segv; 255 256 if (test_thread_flag(TIF_32BIT)) { 257 pc &= 0xffffffff; 258 npc &= 0xffffffff; 259 } 260 regs->tpc = pc; 261 regs->tnpc = npc; 262 263 /* 2. Restore the state */ 264 err = __get_user(regs->y, &sf->regs.y); 265 err |= __get_user(psr, &sf->regs.psr); 266 267 for (i = UREG_G1; i <= UREG_I7; i++) 268 err |= __get_user(regs->u_regs[i], &sf->regs.u_regs[i]); 269 if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) { 270 err |= __get_user(i, &sf->v8plus.g_upper[0]); 271 if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) { 272 unsigned long asi; 273 274 for (i = UREG_G1; i <= UREG_I7; i++) 275 err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]); 276 err |= __get_user(asi, &sf->v8plus.asi); 277 regs->tstate &= ~TSTATE_ASI; 278 regs->tstate |= ((asi & 0xffUL) << 24UL); 279 } 280 } 281 282 /* User can only change condition codes in %tstate. */ 283 regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC); 284 regs->tstate |= psr_to_tstate_icc(psr); 285 286 /* Prevent syscall restart. */ 287 pt_regs_clear_syscall(regs); 288 289 err |= __get_user(fpu_save, &sf->fpu_save); 290 if (!err && fpu_save) 291 err |= restore_fpu_state(regs, compat_ptr(fpu_save)); 292 err |= copy_from_user(&seta, &sf->mask, sizeof(compat_sigset_t)); 293 err |= compat_restore_altstack(&sf->stack); 294 if (err) 295 goto segv; 296 297 err |= __get_user(rwin_save, &sf->rwin_save); 298 if (!err && rwin_save) { 299 if (restore_rwin_state(compat_ptr(rwin_save))) 300 goto segv; 301 } 302 303 set.sig[0] = seta.sig[0] + (((long)seta.sig[1]) << 32); 304 set_current_blocked(&set); 305 return; 306segv: 307 force_sig(SIGSEGV, current); 308} 309 310/* Checks if the fp is valid */ 311static int invalid_frame_pointer(void __user *fp, int fplen) 312{ 313 if ((((unsigned long) fp) & 7) || ((unsigned long)fp) > 0x100000000ULL - fplen) 314 return 1; 315 return 0; 316} 317 318static void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs, unsigned long framesize) 319{ 320 unsigned long sp; 321 322 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; 323 sp = regs->u_regs[UREG_FP]; 324 325 /* 326 * If we are on the alternate signal stack and would overflow it, don't. 327 * Return an always-bogus address instead so we will die with SIGSEGV. 328 */ 329 if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize))) 330 return (void __user *) -1L; 331 332 /* This is the X/Open sanctioned signal stack switching. */ 333 sp = sigsp(sp, ksig) - framesize; 334 335 /* Always align the stack frame. This handles two cases. First, 336 * sigaltstack need not be mindful of platform specific stack 337 * alignment. Second, if we took this signal because the stack 338 * is not aligned properly, we'd like to take the signal cleanly 339 * and report that. 340 */ 341 sp &= ~15UL; 342 343 return (void __user *) sp; 344} 345 346/* The I-cache flush instruction only works in the primary ASI, which 347 * right now is the nucleus, aka. kernel space. 348 * 349 * Therefore we have to kick the instructions out using the kernel 350 * side linear mapping of the physical address backing the user 351 * instructions. 352 */ 353static void flush_signal_insns(unsigned long address) 354{ 355 unsigned long pstate, paddr; 356 pte_t *ptep, pte; 357 pgd_t *pgdp; 358 pud_t *pudp; 359 pmd_t *pmdp; 360 361 /* Commit all stores of the instructions we are about to flush. */ 362 wmb(); 363 364 /* Disable cross-call reception. In this way even a very wide 365 * munmap() on another cpu can't tear down the page table 366 * hierarchy from underneath us, since that can't complete 367 * until the IPI tlb flush returns. 368 */ 369 370 __asm__ __volatile__("rdpr %%pstate, %0" : "=r" (pstate)); 371 __asm__ __volatile__("wrpr %0, %1, %%pstate" 372 : : "r" (pstate), "i" (PSTATE_IE)); 373 374 pgdp = pgd_offset(current->mm, address); 375 if (pgd_none(*pgdp)) 376 goto out_irqs_on; 377 pudp = pud_offset(pgdp, address); 378 if (pud_none(*pudp)) 379 goto out_irqs_on; 380 pmdp = pmd_offset(pudp, address); 381 if (pmd_none(*pmdp)) 382 goto out_irqs_on; 383 384 ptep = pte_offset_map(pmdp, address); 385 pte = *ptep; 386 if (!pte_present(pte)) 387 goto out_unmap; 388 389 paddr = (unsigned long) page_address(pte_page(pte)); 390 391 __asm__ __volatile__("flush %0 + %1" 392 : /* no outputs */ 393 : "r" (paddr), 394 "r" (address & (PAGE_SIZE - 1)) 395 : "memory"); 396 397out_unmap: 398 pte_unmap(ptep); 399out_irqs_on: 400 __asm__ __volatile__("wrpr %0, 0x0, %%pstate" : : "r" (pstate)); 401 402} 403 404static int setup_frame32(struct ksignal *ksig, struct pt_regs *regs, 405 sigset_t *oldset) 406{ 407 struct signal_frame32 __user *sf; 408 int i, err, wsaved; 409 void __user *tail; 410 int sigframe_size; 411 u32 psr; 412 compat_sigset_t seta; 413 414 /* 1. Make sure everything is clean */ 415 synchronize_user_stack(); 416 save_and_clear_fpu(); 417 418 wsaved = get_thread_wsaved(); 419 420 sigframe_size = sizeof(*sf); 421 if (current_thread_info()->fpsaved[0] & FPRS_FEF) 422 sigframe_size += sizeof(__siginfo_fpu_t); 423 if (wsaved) 424 sigframe_size += sizeof(__siginfo_rwin_t); 425 426 sf = (struct signal_frame32 __user *) 427 get_sigframe(ksig, regs, sigframe_size); 428 429 if (invalid_frame_pointer(sf, sigframe_size)) { 430 do_exit(SIGILL); 431 return -EINVAL; 432 } 433 434 tail = (sf + 1); 435 436 /* 2. Save the current process state */ 437 if (test_thread_flag(TIF_32BIT)) { 438 regs->tpc &= 0xffffffff; 439 regs->tnpc &= 0xffffffff; 440 } 441 err = put_user(regs->tpc, &sf->info.si_regs.pc); 442 err |= __put_user(regs->tnpc, &sf->info.si_regs.npc); 443 err |= __put_user(regs->y, &sf->info.si_regs.y); 444 psr = tstate_to_psr(regs->tstate); 445 if (current_thread_info()->fpsaved[0] & FPRS_FEF) 446 psr |= PSR_EF; 447 err |= __put_user(psr, &sf->info.si_regs.psr); 448 for (i = 0; i < 16; i++) 449 err |= __put_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]); 450 err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size); 451 err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]); 452 for (i = 1; i < 16; i++) 453 err |= __put_user(((u32 *)regs->u_regs)[2*i], 454 &sf->v8plus.g_upper[i]); 455 err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL, 456 &sf->v8plus.asi); 457 458 if (psr & PSR_EF) { 459 __siginfo_fpu_t __user *fp = tail; 460 tail += sizeof(*fp); 461 err |= save_fpu_state(regs, fp); 462 err |= __put_user((u64)fp, &sf->fpu_save); 463 } else { 464 err |= __put_user(0, &sf->fpu_save); 465 } 466 if (wsaved) { 467 __siginfo_rwin_t __user *rwp = tail; 468 tail += sizeof(*rwp); 469 err |= save_rwin_state(wsaved, rwp); 470 err |= __put_user((u64)rwp, &sf->rwin_save); 471 set_thread_wsaved(0); 472 } else { 473 err |= __put_user(0, &sf->rwin_save); 474 } 475 476 /* If these change we need to know - assignments to seta relies on these sizes */ 477 BUILD_BUG_ON(_NSIG_WORDS != 1); 478 BUILD_BUG_ON(_COMPAT_NSIG_WORDS != 2); 479 seta.sig[1] = (oldset->sig[0] >> 32); 480 seta.sig[0] = oldset->sig[0]; 481 482 err |= __put_user(seta.sig[0], &sf->info.si_mask); 483 err |= __copy_to_user(sf->extramask, &seta.sig[1], 484 (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int)); 485 486 if (!wsaved) { 487 err |= copy_in_user((u32 __user *)sf, 488 (u32 __user *)(regs->u_regs[UREG_FP]), 489 sizeof(struct reg_window32)); 490 } else { 491 struct reg_window *rp; 492 493 rp = ¤t_thread_info()->reg_window[wsaved - 1]; 494 for (i = 0; i < 8; i++) 495 err |= __put_user(rp->locals[i], &sf->ss.locals[i]); 496 for (i = 0; i < 6; i++) 497 err |= __put_user(rp->ins[i], &sf->ss.ins[i]); 498 err |= __put_user(rp->ins[6], &sf->ss.fp); 499 err |= __put_user(rp->ins[7], &sf->ss.callers_pc); 500 } 501 if (err) 502 return err; 503 504 /* 3. signal handler back-trampoline and parameters */ 505 regs->u_regs[UREG_FP] = (unsigned long) sf; 506 regs->u_regs[UREG_I0] = ksig->sig; 507 regs->u_regs[UREG_I1] = (unsigned long) &sf->info; 508 regs->u_regs[UREG_I2] = (unsigned long) &sf->info; 509 510 /* 4. signal handler */ 511 regs->tpc = (unsigned long) ksig->ka.sa.sa_handler; 512 regs->tnpc = (regs->tpc + 4); 513 if (test_thread_flag(TIF_32BIT)) { 514 regs->tpc &= 0xffffffff; 515 regs->tnpc &= 0xffffffff; 516 } 517 518 /* 5. return to kernel instructions */ 519 if (ksig->ka.ka_restorer) { 520 regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer; 521 } else { 522 unsigned long address = ((unsigned long)&(sf->insns[0])); 523 524 regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2); 525 526 err = __put_user(0x821020d8, &sf->insns[0]); /*mov __NR_sigreturn, %g1*/ 527 err |= __put_user(0x91d02010, &sf->insns[1]); /*t 0x10*/ 528 if (err) 529 return err; 530 flush_signal_insns(address); 531 } 532 return 0; 533} 534 535static int setup_rt_frame32(struct ksignal *ksig, struct pt_regs *regs, 536 sigset_t *oldset) 537{ 538 struct rt_signal_frame32 __user *sf; 539 int i, err, wsaved; 540 void __user *tail; 541 int sigframe_size; 542 u32 psr; 543 compat_sigset_t seta; 544 545 /* 1. Make sure everything is clean */ 546 synchronize_user_stack(); 547 save_and_clear_fpu(); 548 549 wsaved = get_thread_wsaved(); 550 551 sigframe_size = sizeof(*sf); 552 if (current_thread_info()->fpsaved[0] & FPRS_FEF) 553 sigframe_size += sizeof(__siginfo_fpu_t); 554 if (wsaved) 555 sigframe_size += sizeof(__siginfo_rwin_t); 556 557 sf = (struct rt_signal_frame32 __user *) 558 get_sigframe(ksig, regs, sigframe_size); 559 560 if (invalid_frame_pointer(sf, sigframe_size)) { 561 do_exit(SIGILL); 562 return -EINVAL; 563 } 564 565 tail = (sf + 1); 566 567 /* 2. Save the current process state */ 568 if (test_thread_flag(TIF_32BIT)) { 569 regs->tpc &= 0xffffffff; 570 regs->tnpc &= 0xffffffff; 571 } 572 err = put_user(regs->tpc, &sf->regs.pc); 573 err |= __put_user(regs->tnpc, &sf->regs.npc); 574 err |= __put_user(regs->y, &sf->regs.y); 575 psr = tstate_to_psr(regs->tstate); 576 if (current_thread_info()->fpsaved[0] & FPRS_FEF) 577 psr |= PSR_EF; 578 err |= __put_user(psr, &sf->regs.psr); 579 for (i = 0; i < 16; i++) 580 err |= __put_user(regs->u_regs[i], &sf->regs.u_regs[i]); 581 err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size); 582 err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]); 583 for (i = 1; i < 16; i++) 584 err |= __put_user(((u32 *)regs->u_regs)[2*i], 585 &sf->v8plus.g_upper[i]); 586 err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL, 587 &sf->v8plus.asi); 588 589 if (psr & PSR_EF) { 590 __siginfo_fpu_t __user *fp = tail; 591 tail += sizeof(*fp); 592 err |= save_fpu_state(regs, fp); 593 err |= __put_user((u64)fp, &sf->fpu_save); 594 } else { 595 err |= __put_user(0, &sf->fpu_save); 596 } 597 if (wsaved) { 598 __siginfo_rwin_t __user *rwp = tail; 599 tail += sizeof(*rwp); 600 err |= save_rwin_state(wsaved, rwp); 601 err |= __put_user((u64)rwp, &sf->rwin_save); 602 set_thread_wsaved(0); 603 } else { 604 err |= __put_user(0, &sf->rwin_save); 605 } 606 607 /* Update the siginfo structure. */ 608 err |= copy_siginfo_to_user32(&sf->info, &ksig->info); 609 610 /* Setup sigaltstack */ 611 err |= __compat_save_altstack(&sf->stack, regs->u_regs[UREG_FP]); 612 613 seta.sig[1] = (oldset->sig[0] >> 32); 614 seta.sig[0] = oldset->sig[0]; 615 err |= __copy_to_user(&sf->mask, &seta, sizeof(compat_sigset_t)); 616 617 if (!wsaved) { 618 err |= copy_in_user((u32 __user *)sf, 619 (u32 __user *)(regs->u_regs[UREG_FP]), 620 sizeof(struct reg_window32)); 621 } else { 622 struct reg_window *rp; 623 624 rp = ¤t_thread_info()->reg_window[wsaved - 1]; 625 for (i = 0; i < 8; i++) 626 err |= __put_user(rp->locals[i], &sf->ss.locals[i]); 627 for (i = 0; i < 6; i++) 628 err |= __put_user(rp->ins[i], &sf->ss.ins[i]); 629 err |= __put_user(rp->ins[6], &sf->ss.fp); 630 err |= __put_user(rp->ins[7], &sf->ss.callers_pc); 631 } 632 if (err) 633 return err; 634 635 /* 3. signal handler back-trampoline and parameters */ 636 regs->u_regs[UREG_FP] = (unsigned long) sf; 637 regs->u_regs[UREG_I0] = ksig->sig; 638 regs->u_regs[UREG_I1] = (unsigned long) &sf->info; 639 regs->u_regs[UREG_I2] = (unsigned long) &sf->regs; 640 641 /* 4. signal handler */ 642 regs->tpc = (unsigned long) ksig->ka.sa.sa_handler; 643 regs->tnpc = (regs->tpc + 4); 644 if (test_thread_flag(TIF_32BIT)) { 645 regs->tpc &= 0xffffffff; 646 regs->tnpc &= 0xffffffff; 647 } 648 649 /* 5. return to kernel instructions */ 650 if (ksig->ka.ka_restorer) 651 regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer; 652 else { 653 unsigned long address = ((unsigned long)&(sf->insns[0])); 654 655 regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2); 656 657 /* mov __NR_rt_sigreturn, %g1 */ 658 err |= __put_user(0x82102065, &sf->insns[0]); 659 660 /* t 0x10 */ 661 err |= __put_user(0x91d02010, &sf->insns[1]); 662 if (err) 663 return err; 664 665 flush_signal_insns(address); 666 } 667 return 0; 668} 669 670static inline void handle_signal32(struct ksignal *ksig, 671 struct pt_regs *regs) 672{ 673 sigset_t *oldset = sigmask_to_save(); 674 int err; 675 676 if (ksig->ka.sa.sa_flags & SA_SIGINFO) 677 err = setup_rt_frame32(ksig, regs, oldset); 678 else 679 err = setup_frame32(ksig, regs, oldset); 680 681 signal_setup_done(err, ksig, 0); 682} 683 684static inline void syscall_restart32(unsigned long orig_i0, struct pt_regs *regs, 685 struct sigaction *sa) 686{ 687 switch (regs->u_regs[UREG_I0]) { 688 case ERESTART_RESTARTBLOCK: 689 case ERESTARTNOHAND: 690 no_system_call_restart: 691 regs->u_regs[UREG_I0] = EINTR; 692 regs->tstate |= TSTATE_ICARRY; 693 break; 694 case ERESTARTSYS: 695 if (!(sa->sa_flags & SA_RESTART)) 696 goto no_system_call_restart; 697 /* fallthrough */ 698 case ERESTARTNOINTR: 699 regs->u_regs[UREG_I0] = orig_i0; 700 regs->tpc -= 4; 701 regs->tnpc -= 4; 702 } 703} 704 705/* Note that 'init' is a special process: it doesn't get signals it doesn't 706 * want to handle. Thus you cannot kill init even with a SIGKILL even by 707 * mistake. 708 */ 709void do_signal32(struct pt_regs * regs) 710{ 711 struct ksignal ksig; 712 unsigned long orig_i0 = 0; 713 int restart_syscall = 0; 714 bool has_handler = get_signal(&ksig); 715 716 if (pt_regs_is_syscall(regs) && 717 (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) { 718 restart_syscall = 1; 719 orig_i0 = regs->u_regs[UREG_G6]; 720 } 721 722 if (has_handler) { 723 if (restart_syscall) 724 syscall_restart32(orig_i0, regs, &ksig.ka.sa); 725 handle_signal32(&ksig, regs); 726 } else { 727 if (restart_syscall) { 728 switch (regs->u_regs[UREG_I0]) { 729 case ERESTARTNOHAND: 730 case ERESTARTSYS: 731 case ERESTARTNOINTR: 732 /* replay the system call when we are done */ 733 regs->u_regs[UREG_I0] = orig_i0; 734 regs->tpc -= 4; 735 regs->tnpc -= 4; 736 pt_regs_clear_syscall(regs); 737 case ERESTART_RESTARTBLOCK: 738 regs->u_regs[UREG_G1] = __NR_restart_syscall; 739 regs->tpc -= 4; 740 regs->tnpc -= 4; 741 pt_regs_clear_syscall(regs); 742 } 743 } 744 restore_saved_sigmask(); 745 } 746} 747 748struct sigstack32 { 749 u32 the_stack; 750 int cur_status; 751}; 752 753asmlinkage int do_sys32_sigstack(u32 u_ssptr, u32 u_ossptr, unsigned long sp) 754{ 755 struct sigstack32 __user *ssptr = 756 (struct sigstack32 __user *)((unsigned long)(u_ssptr)); 757 struct sigstack32 __user *ossptr = 758 (struct sigstack32 __user *)((unsigned long)(u_ossptr)); 759 int ret = -EFAULT; 760 761 /* First see if old state is wanted. */ 762 if (ossptr) { 763 if (put_user(current->sas_ss_sp + current->sas_ss_size, 764 &ossptr->the_stack) || 765 __put_user(on_sig_stack(sp), &ossptr->cur_status)) 766 goto out; 767 } 768 769 /* Now see if we want to update the new state. */ 770 if (ssptr) { 771 u32 ss_sp; 772 773 if (get_user(ss_sp, &ssptr->the_stack)) 774 goto out; 775 776 /* If the current stack was set with sigaltstack, don't 777 * swap stacks while we are on it. 778 */ 779 ret = -EPERM; 780 if (current->sas_ss_sp && on_sig_stack(sp)) 781 goto out; 782 783 /* Since we don't know the extent of the stack, and we don't 784 * track onstack-ness, but rather calculate it, we must 785 * presume a size. Ho hum this interface is lossy. 786 */ 787 current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ; 788 current->sas_ss_size = SIGSTKSZ; 789 } 790 791 ret = 0; 792out: 793 return ret; 794} 795