1 2 /*--------------------------------------------------------------------*/ 3 /*--- Create/destroy signal delivery frames. ---*/ 4 /*--- sigframe-x86-linux.c ---*/ 5 /*--------------------------------------------------------------------*/ 6 7 /* 8 This file is part of Valgrind, a dynamic binary instrumentation 9 framework. 10 11 Copyright (C) 2000-2015 Nicholas Nethercote 12 njn (at) valgrind.org 13 14 This program is free software; you can redistribute it and/or 15 modify it under the terms of the GNU General Public License as 16 published by the Free Software Foundation; either version 2 of the 17 License, or (at your option) any later version. 18 19 This program is distributed in the hope that it will be useful, but 20 WITHOUT ANY WARRANTY; without even the implied warranty of 21 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 22 General Public License for more details. 23 24 You should have received a copy of the GNU General Public License 25 along with this program; if not, write to the Free Software 26 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 27 02111-1307, USA. 28 29 The GNU General Public License is contained in the file COPYING. 30 */ 31 32 #if defined(VGP_x86_linux) 33 34 #include "pub_core_basics.h" 35 #include "pub_core_vki.h" 36 #include "pub_core_threadstate.h" 37 #include "pub_core_aspacemgr.h" /* find_segment */ 38 #include "pub_core_libcbase.h" 39 #include "pub_core_libcassert.h" 40 #include "pub_core_libcprint.h" 41 #include "pub_core_machine.h" 42 #include "pub_core_options.h" 43 #include "pub_core_signals.h" 44 #include "pub_core_tooliface.h" 45 #include "pub_core_trampoline.h" 46 #include "pub_core_sigframe.h" /* self */ 47 #include "priv_sigframe.h" 48 49 /* This module creates and removes signal frames for signal deliveries 50 on x86-linux. 51 52 Note, this file contains kernel-specific knowledge in the form of 53 'struct sigframe' and 'struct rt_sigframe'. How does that relate 54 to the vki kernel interface stuff? 55 56 Either a 'struct sigframe' or a 'struct rtsigframe' is pushed 57 onto the client's stack. This contains a subsidiary 58 vki_ucontext. That holds the vcpu's state across the signal, 59 so that the sighandler can mess with the vcpu state if it 60 really wants. 61 62 FIXME: sigcontexting is basically broken for the moment. When 63 delivering a signal, the integer registers and %eflags are 64 correctly written into the sigcontext, however the FP and SSE state 65 is not. When returning from a signal, only the integer registers 66 are restored from the sigcontext; the rest of the CPU state is 67 restored to what it was before the signal. 68 69 This will be fixed. 70 */ 71 72 73 /*------------------------------------------------------------*/ 74 /*--- Signal frame layouts ---*/ 75 /*------------------------------------------------------------*/ 76 77 // A structure in which to save the application's registers 78 // during the execution of signal handlers. 79 80 // Linux has 2 signal frame structures: one for normal signal 81 // deliveries, and one for SA_SIGINFO deliveries (also known as RT 82 // signals). 83 // 84 // In theory, so long as we get the arguments to the handler function 85 // right, it doesn't matter what the exact layout of the rest of the 86 // frame is. Unfortunately, things like gcc's exception unwinding 87 // make assumptions about the locations of various parts of the frame, 88 // so we need to duplicate it exactly. 89 90 /* Valgrind-specific parts of the signal frame */ 91 struct vg_sigframe 92 { 93 /* Sanity check word. */ 94 UInt magicPI; 95 96 UInt handlerflags; /* flags for signal handler */ 97 98 99 /* Safely-saved version of sigNo, as described above. */ 100 Int sigNo_private; 101 102 /* XXX This is wrong. Surely we should store the shadow values 103 into the shadow memory behind the actual values? */ 104 VexGuestX86State vex_shadow1; 105 VexGuestX86State vex_shadow2; 106 107 /* HACK ALERT */ 108 VexGuestX86State vex; 109 /* end HACK ALERT */ 110 111 /* saved signal mask to be restored when handler returns */ 112 vki_sigset_t mask; 113 114 /* Sanity check word. Is the highest-addressed word; do not 115 move!*/ 116 UInt magicE; 117 }; 118 119 struct sigframe 120 { 121 /* Sig handler's return address */ 122 Addr retaddr; 123 Int sigNo; 124 125 struct vki_sigcontext sigContext; 126 struct _vki_fpstate fpstate; 127 128 struct vg_sigframe vg; 129 }; 130 131 struct rt_sigframe 132 { 133 /* Sig handler's return address */ 134 Addr retaddr; 135 Int sigNo; 136 137 /* ptr to siginfo_t. */ 138 Addr psigInfo; 139 140 /* ptr to ucontext */ 141 Addr puContext; 142 /* pointed to by psigInfo */ 143 vki_siginfo_t sigInfo; 144 145 /* pointed to by puContext */ 146 struct vki_ucontext uContext; 147 struct _vki_fpstate fpstate; 148 149 struct vg_sigframe vg; 150 }; 151 152 153 //:: /*------------------------------------------------------------*/ 154 //:: /*--- Signal operations ---*/ 155 //:: /*------------------------------------------------------------*/ 156 //:: 157 //:: /* 158 //:: Great gobs of FP state conversion taken wholesale from 159 //:: linux/arch/i386/kernel/i387.c 160 //:: */ 161 //:: 162 //:: /* 163 //:: * FXSR floating point environment conversions. 164 //:: */ 165 //:: #define X86_FXSR_MAGIC 0x0000 166 //:: 167 //:: /* 168 //:: * FPU tag word conversions. 169 //:: */ 170 //:: 171 //:: static inline unsigned short twd_i387_to_fxsr( unsigned short twd ) 172 //:: { 173 //:: unsigned int tmp; /* to avoid 16 bit prefixes in the code */ 174 //:: 175 //:: /* Transform each pair of bits into 01 (valid) or 00 (empty) */ 176 //:: tmp = ~twd; 177 //:: tmp = (tmp | (tmp>>1)) & 0x5555; /* 0V0V0V0V0V0V0V0V */ 178 //:: /* and move the valid bits to the lower byte. */ 179 //:: tmp = (tmp | (tmp >> 1)) & 0x3333; /* 00VV00VV00VV00VV */ 180 //:: tmp = (tmp | (tmp >> 2)) & 0x0f0f; /* 0000VVVV0000VVVV */ 181 //:: tmp = (tmp | (tmp >> 4)) & 0x00ff; /* 00000000VVVVVVVV */ 182 //:: return tmp; 183 //:: } 184 //:: 185 //:: static unsigned long twd_fxsr_to_i387( const struct i387_fxsave_struct *fxsave ) 186 //:: { 187 //:: struct _vki_fpxreg *st = NULL; 188 //:: unsigned long twd = (unsigned long) fxsave->twd; 189 //:: unsigned long tag; 190 //:: unsigned long ret = 0xffff0000u; 191 //:: int i; 192 //:: 193 //:: #define FPREG_ADDR(f, n) ((char *)&(f)->st_space + (n) * 16); 194 //:: 195 //:: for ( i = 0 ; i < 8 ; i++ ) { 196 //:: if ( twd & 0x1 ) { 197 //:: st = (struct _vki_fpxreg *) FPREG_ADDR( fxsave, i ); 198 //:: 199 //:: switch ( st->exponent & 0x7fff ) { 200 //:: case 0x7fff: 201 //:: tag = 2; /* Special */ 202 //:: break; 203 //:: case 0x0000: 204 //:: if ( !st->significand[0] && 205 //:: !st->significand[1] && 206 //:: !st->significand[2] && 207 //:: !st->significand[3] ) { 208 //:: tag = 1; /* Zero */ 209 //:: } else { 210 //:: tag = 2; /* Special */ 211 //:: } 212 //:: break; 213 //:: default: 214 //:: if ( st->significand[3] & 0x8000 ) { 215 //:: tag = 0; /* Valid */ 216 //:: } else { 217 //:: tag = 2; /* Special */ 218 //:: } 219 //:: break; 220 //:: } 221 //:: } else { 222 //:: tag = 3; /* Empty */ 223 //:: } 224 //:: ret |= (tag << (2 * i)); 225 //:: twd = twd >> 1; 226 //:: } 227 //:: return ret; 228 //:: } 229 //:: 230 //:: static void convert_fxsr_to_user( struct _vki_fpstate *buf, 231 //:: const struct i387_fxsave_struct *fxsave ) 232 //:: { 233 //:: unsigned long env[7]; 234 //:: struct _vki_fpreg *to; 235 //:: struct _vki_fpxreg *from; 236 //:: int i; 237 //:: 238 //:: env[0] = (unsigned long)fxsave->cwd | 0xffff0000ul; 239 //:: env[1] = (unsigned long)fxsave->swd | 0xffff0000ul; 240 //:: env[2] = twd_fxsr_to_i387(fxsave); 241 //:: env[3] = fxsave->fip; 242 //:: env[4] = fxsave->fcs | ((unsigned long)fxsave->fop << 16); 243 //:: env[5] = fxsave->foo; 244 //:: env[6] = fxsave->fos; 245 //:: 246 //:: VG_(memcpy)(buf, env, 7 * sizeof(unsigned long)); 247 //:: 248 //:: to = &buf->_st[0]; 249 //:: from = (struct _vki_fpxreg *) &fxsave->st_space[0]; 250 //:: for ( i = 0 ; i < 8 ; i++, to++, from++ ) { 251 //:: unsigned long __user *t = (unsigned long __user *)to; 252 //:: unsigned long *f = (unsigned long *)from; 253 //:: 254 //:: t[0] = f[0]; 255 //:: t[1] = f[1]; 256 //:: to->exponent = from->exponent; 257 //:: } 258 //:: } 259 //:: 260 //:: static void convert_fxsr_from_user( struct i387_fxsave_struct *fxsave, 261 //:: const struct _vki_fpstate *buf ) 262 //:: { 263 //:: unsigned long env[7]; 264 //:: struct _vki_fpxreg *to; 265 //:: const struct _vki_fpreg *from; 266 //:: int i; 267 //:: 268 //:: VG_(memcpy)(env, buf, 7 * sizeof(long)); 269 //:: 270 //:: fxsave->cwd = (unsigned short)(env[0] & 0xffff); 271 //:: fxsave->swd = (unsigned short)(env[1] & 0xffff); 272 //:: fxsave->twd = twd_i387_to_fxsr((unsigned short)(env[2] & 0xffff)); 273 //:: fxsave->fip = env[3]; 274 //:: fxsave->fop = (unsigned short)((env[4] & 0xffff0000ul) >> 16); 275 //:: fxsave->fcs = (env[4] & 0xffff); 276 //:: fxsave->foo = env[5]; 277 //:: fxsave->fos = env[6]; 278 //:: 279 //:: to = (struct _vki_fpxreg *) &fxsave->st_space[0]; 280 //:: from = &buf->_st[0]; 281 //:: for ( i = 0 ; i < 8 ; i++, to++, from++ ) { 282 //:: unsigned long *t = (unsigned long *)to; 283 //:: unsigned long __user *f = (unsigned long __user *)from; 284 //:: 285 //:: t[0] = f[0]; 286 //:: t[1] = f[1]; 287 //:: to->exponent = from->exponent; 288 //:: } 289 //:: } 290 //:: 291 //:: static inline void save_i387_fsave( arch_thread_t *regs, struct _vki_fpstate *buf ) 292 //:: { 293 //:: struct i387_fsave_struct *fs = ®s->m_sse.fsave; 294 //:: 295 //:: fs->status = fs->swd; 296 //:: VG_(memcpy)(buf, fs, sizeof(*fs)); 297 //:: } 298 //:: 299 //:: static void save_i387_fxsave( arch_thread_t *regs, struct _vki_fpstate *buf ) 300 //:: { 301 //:: const struct i387_fxsave_struct *fx = ®s->m_sse.fxsave; 302 //:: convert_fxsr_to_user( buf, fx ); 303 //:: 304 //:: buf->status = fx->swd; 305 //:: buf->magic = X86_FXSR_MAGIC; 306 //:: VG_(memcpy)(buf->_fxsr_env, fx, sizeof(struct i387_fxsave_struct)); 307 //:: } 308 //:: 309 //:: static void save_i387( arch_thread_t *regs, struct _vki_fpstate *buf ) 310 //:: { 311 //:: if ( VG_(have_ssestate) ) 312 //:: save_i387_fxsave( regs, buf ); 313 //:: else 314 //:: save_i387_fsave( regs, buf ); 315 //:: } 316 //:: 317 //:: static inline void restore_i387_fsave( arch_thread_t *regs, const struct _vki_fpstate __user *buf ) 318 //:: { 319 //:: VG_(memcpy)( ®s->m_sse.fsave, buf, sizeof(struct i387_fsave_struct) ); 320 //:: } 321 //:: 322 //:: static void restore_i387_fxsave( arch_thread_t *regs, const struct _vki_fpstate __user *buf ) 323 //:: { 324 //:: VG_(memcpy)(®s->m_sse.fxsave, &buf->_fxsr_env[0], 325 //:: sizeof(struct i387_fxsave_struct) ); 326 //:: /* mxcsr reserved bits must be masked to zero for security reasons */ 327 //:: regs->m_sse.fxsave.mxcsr &= 0xffbf; 328 //:: convert_fxsr_from_user( ®s->m_sse.fxsave, buf ); 329 //:: } 330 //:: 331 //:: static void restore_i387( arch_thread_t *regs, const struct _vki_fpstate __user *buf ) 332 //:: { 333 //:: if ( VG_(have_ssestate) ) { 334 //:: restore_i387_fxsave( regs, buf ); 335 //:: } else { 336 //:: restore_i387_fsave( regs, buf ); 337 //:: } 338 //:: } 339 340 341 /*------------------------------------------------------------*/ 342 /*--- Creating signal frames ---*/ 343 /*------------------------------------------------------------*/ 344 345 /* Create a plausible-looking sigcontext from the thread's 346 Vex guest state. NOTE: does not fill in the FP or SSE 347 bits of sigcontext at the moment. 348 */ 349 static 350 void synth_ucontext(ThreadId tid, const vki_siginfo_t *si, 351 UWord trapno, UWord err, const vki_sigset_t *set, 352 struct vki_ucontext *uc, struct _vki_fpstate *fpstate) 353 { 354 ThreadState *tst = VG_(get_ThreadState)(tid); 355 struct vki_sigcontext *sc = &uc->uc_mcontext; 356 357 VG_(memset)(uc, 0, sizeof(*uc)); 358 359 uc->uc_flags = 0; 360 uc->uc_link = 0; 361 uc->uc_sigmask = *set; 362 uc->uc_stack = tst->altstack; 363 sc->fpstate = fpstate; 364 365 // FIXME: save_i387(&tst->arch, fpstate); 366 367 # define SC2(reg,REG) sc->reg = tst->arch.vex.guest_##REG 368 SC2(gs,GS); 369 SC2(fs,FS); 370 SC2(es,ES); 371 SC2(ds,DS); 372 373 SC2(edi,EDI); 374 SC2(esi,ESI); 375 SC2(ebp,EBP); 376 SC2(esp,ESP); 377 SC2(ebx,EBX); 378 SC2(edx,EDX); 379 SC2(ecx,ECX); 380 SC2(eax,EAX); 381 382 SC2(eip,EIP); 383 SC2(cs,CS); 384 sc->eflags = LibVEX_GuestX86_get_eflags(&tst->arch.vex); 385 SC2(ss,SS); 386 /* XXX esp_at_signal */ 387 sc->trapno = trapno; 388 sc->err = err; 389 # undef SC2 390 391 sc->cr2 = (UInt)si->_sifields._sigfault._addr; 392 } 393 394 395 /* Build the Valgrind-specific part of a signal frame. */ 396 397 static void build_vg_sigframe(struct vg_sigframe *frame, 398 ThreadState *tst, 399 UInt flags, 400 Int sigNo) 401 { 402 frame->sigNo_private = sigNo; 403 frame->magicPI = 0x31415927; 404 frame->vex_shadow1 = tst->arch.vex_shadow1; 405 frame->vex_shadow2 = tst->arch.vex_shadow2; 406 /* HACK ALERT */ 407 frame->vex = tst->arch.vex; 408 /* end HACK ALERT */ 409 frame->mask = tst->sig_mask; 410 frame->handlerflags = flags; 411 frame->magicE = 0x27182818; 412 } 413 414 415 static Addr build_sigframe(ThreadState *tst, 416 Addr esp_top_of_frame, 417 const vki_siginfo_t *siginfo, 418 const struct vki_ucontext *siguc, 419 UInt flags, 420 const vki_sigset_t *mask, 421 void *restorer) 422 { 423 struct sigframe *frame; 424 Addr esp = esp_top_of_frame; 425 Int sigNo = siginfo->si_signo; 426 UWord trapno; 427 UWord err; 428 struct vki_ucontext uc; 429 430 vg_assert((flags & VKI_SA_SIGINFO) == 0); 431 432 esp -= sizeof(*frame); 433 esp = VG_ROUNDDN(esp, 16); 434 frame = (struct sigframe *)esp; 435 436 if (! ML_(sf_maybe_extend_stack)(tst, esp, sizeof(*frame), flags)) 437 return esp_top_of_frame; 438 439 /* retaddr, sigNo, siguContext fields are to be written */ 440 VG_TRACK( pre_mem_write, Vg_CoreSignal, tst->tid, "signal handler frame", 441 esp, offsetof(struct sigframe, vg) ); 442 443 frame->sigNo = sigNo; 444 445 if (flags & VKI_SA_RESTORER) 446 frame->retaddr = (Addr)restorer; 447 else 448 frame->retaddr = (Addr)&VG_(x86_linux_SUBST_FOR_sigreturn); 449 450 if (siguc) { 451 trapno = siguc->uc_mcontext.trapno; 452 err = siguc->uc_mcontext.err; 453 } else { 454 trapno = 0; 455 err = 0; 456 } 457 458 synth_ucontext(tst->tid, siginfo, trapno, err, mask, &uc, &frame->fpstate); 459 460 VG_(memcpy)(&frame->sigContext, &uc.uc_mcontext, 461 sizeof(struct vki_sigcontext)); 462 frame->sigContext.oldmask = mask->sig[0]; 463 464 VG_TRACK( post_mem_write, Vg_CoreSignal, tst->tid, 465 esp, offsetof(struct sigframe, vg) ); 466 467 build_vg_sigframe(&frame->vg, tst, flags, sigNo); 468 469 return esp; 470 } 471 472 473 static Addr build_rt_sigframe(ThreadState *tst, 474 Addr esp_top_of_frame, 475 const vki_siginfo_t *siginfo, 476 const struct vki_ucontext *siguc, 477 UInt flags, 478 const vki_sigset_t *mask, 479 void *restorer) 480 { 481 struct rt_sigframe *frame; 482 Addr esp = esp_top_of_frame; 483 Int sigNo = siginfo->si_signo; 484 UWord trapno; 485 UWord err; 486 487 vg_assert((flags & VKI_SA_SIGINFO) != 0); 488 489 esp -= sizeof(*frame); 490 esp = VG_ROUNDDN(esp, 16); 491 frame = (struct rt_sigframe *)esp; 492 493 if (! ML_(sf_maybe_extend_stack)(tst, esp, sizeof(*frame), flags)) 494 return esp_top_of_frame; 495 496 /* retaddr, sigNo, pSiginfo, puContext fields are to be written */ 497 VG_TRACK( pre_mem_write, Vg_CoreSignal, tst->tid, "rt signal handler frame", 498 esp, offsetof(struct rt_sigframe, vg) ); 499 500 frame->sigNo = sigNo; 501 502 if (flags & VKI_SA_RESTORER) 503 frame->retaddr = (Addr)restorer; 504 else 505 frame->retaddr = (Addr)&VG_(x86_linux_SUBST_FOR_rt_sigreturn); 506 507 if (siguc) { 508 trapno = siguc->uc_mcontext.trapno; 509 err = siguc->uc_mcontext.err; 510 } else { 511 trapno = 0; 512 err = 0; 513 } 514 515 frame->psigInfo = (Addr)&frame->sigInfo; 516 frame->puContext = (Addr)&frame->uContext; 517 VG_(memcpy)(&frame->sigInfo, siginfo, sizeof(vki_siginfo_t)); 518 519 /* SIGILL defines addr to be the faulting address */ 520 if (sigNo == VKI_SIGILL && siginfo->si_code > 0) 521 frame->sigInfo._sifields._sigfault._addr 522 = (void*)tst->arch.vex.guest_EIP; 523 524 synth_ucontext(tst->tid, siginfo, trapno, err, mask, 525 &frame->uContext, &frame->fpstate); 526 527 VG_TRACK( post_mem_write, Vg_CoreSignal, tst->tid, 528 esp, offsetof(struct rt_sigframe, vg) ); 529 530 build_vg_sigframe(&frame->vg, tst, flags, sigNo); 531 532 return esp; 533 } 534 535 536 /* EXPORTED */ 537 void VG_(sigframe_create)( ThreadId tid, 538 Bool on_altstack, 539 Addr esp_top_of_frame, 540 const vki_siginfo_t *siginfo, 541 const struct vki_ucontext *siguc, 542 void *handler, 543 UInt flags, 544 const vki_sigset_t *mask, 545 void *restorer ) 546 { 547 Addr esp; 548 ThreadState* tst = VG_(get_ThreadState)(tid); 549 550 if (flags & VKI_SA_SIGINFO) 551 esp = build_rt_sigframe(tst, esp_top_of_frame, siginfo, siguc, 552 flags, mask, restorer); 553 else 554 esp = build_sigframe(tst, esp_top_of_frame, siginfo, siguc, 555 flags, mask, restorer); 556 557 /* Set the thread so it will next run the handler. */ 558 /* tst->m_esp = esp; also notify the tool we've updated ESP */ 559 VG_(set_SP)(tid, esp); 560 VG_TRACK( post_reg_write, Vg_CoreSignal, tid, VG_O_STACK_PTR, sizeof(Addr)); 561 562 //VG_(printf)("handler = %p\n", handler); 563 tst->arch.vex.guest_EIP = (Addr) handler; 564 /* This thread needs to be marked runnable, but we leave that the 565 caller to do. */ 566 567 if (0) 568 VG_(printf)("pushed signal frame; %%ESP now = %#lx, " 569 "next %%EIP = %#x, status=%d\n", 570 esp, tst->arch.vex.guest_EIP, (Int)tst->status); 571 } 572 573 574 /*------------------------------------------------------------*/ 575 /*--- Destroying signal frames ---*/ 576 /*------------------------------------------------------------*/ 577 578 /* Return False and don't do anything, just set the client to take a 579 segfault, if it looks like the frame is corrupted. */ 580 static 581 Bool restore_vg_sigframe ( ThreadState *tst, 582 struct vg_sigframe *frame, Int *sigNo ) 583 { 584 if (frame->magicPI != 0x31415927 || 585 frame->magicE != 0x27182818) { 586 VG_(message)(Vg_UserMsg, "Thread %u return signal frame " 587 "corrupted. Killing process.\n", 588 tst->tid); 589 VG_(set_default_handler)(VKI_SIGSEGV); 590 VG_(synth_fault)(tst->tid); 591 *sigNo = VKI_SIGSEGV; 592 return False; 593 } 594 tst->sig_mask = frame->mask; 595 tst->tmp_sig_mask = frame->mask; 596 tst->arch.vex_shadow1 = frame->vex_shadow1; 597 tst->arch.vex_shadow2 = frame->vex_shadow2; 598 /* HACK ALERT */ 599 tst->arch.vex = frame->vex; 600 /* end HACK ALERT */ 601 *sigNo = frame->sigNo_private; 602 return True; 603 } 604 605 static 606 void restore_sigcontext( ThreadState *tst, 607 struct vki_sigcontext *sc, 608 struct _vki_fpstate *fpstate ) 609 { 610 tst->arch.vex.guest_EAX = sc->eax; 611 tst->arch.vex.guest_ECX = sc->ecx; 612 tst->arch.vex.guest_EDX = sc->edx; 613 tst->arch.vex.guest_EBX = sc->ebx; 614 tst->arch.vex.guest_EBP = sc->ebp; 615 tst->arch.vex.guest_ESP = sc->esp; 616 tst->arch.vex.guest_ESI = sc->esi; 617 tst->arch.vex.guest_EDI = sc->edi; 618 //:: tst->arch.vex.guest_eflags = sc->eflags; 619 tst->arch.vex.guest_EIP = sc->eip; 620 tst->arch.vex.guest_CS = sc->cs; 621 tst->arch.vex.guest_SS = sc->ss; 622 tst->arch.vex.guest_DS = sc->ds; 623 tst->arch.vex.guest_ES = sc->es; 624 tst->arch.vex.guest_FS = sc->fs; 625 tst->arch.vex.guest_GS = sc->gs; 626 627 //:: restore_i387(&tst->arch, fpstate); 628 } 629 630 631 static 632 SizeT restore_sigframe ( ThreadState *tst, 633 struct sigframe *frame, Int *sigNo ) 634 { 635 if (restore_vg_sigframe(tst, &frame->vg, sigNo)) 636 restore_sigcontext(tst, &frame->sigContext, &frame->fpstate); 637 638 return sizeof(*frame); 639 } 640 641 static 642 SizeT restore_rt_sigframe ( ThreadState *tst, 643 struct rt_sigframe *frame, Int *sigNo ) 644 { 645 if (restore_vg_sigframe(tst, &frame->vg, sigNo)) 646 restore_sigcontext(tst, &frame->uContext.uc_mcontext, &frame->fpstate); 647 648 return sizeof(*frame); 649 } 650 651 652 /* EXPORTED */ 653 void VG_(sigframe_destroy)( ThreadId tid, Bool isRT ) 654 { 655 Addr esp; 656 ThreadState* tst; 657 SizeT size; 658 Int sigNo; 659 660 tst = VG_(get_ThreadState)(tid); 661 662 /* Correctly reestablish the frame base address. */ 663 esp = tst->arch.vex.guest_ESP; 664 665 if (!isRT) 666 size = restore_sigframe(tst, (struct sigframe *)esp, &sigNo); 667 else 668 size = restore_rt_sigframe(tst, (struct rt_sigframe *)esp, &sigNo); 669 670 VG_TRACK( die_mem_stack_signal, esp - VG_STACK_REDZONE_SZB, 671 size + VG_STACK_REDZONE_SZB ); 672 673 if (VG_(clo_trace_signals)) 674 VG_(message)( 675 Vg_DebugMsg, 676 "VG_(signal_return) (thread %u): isRT=%d valid magic; EIP=%#x\n", 677 tid, isRT, tst->arch.vex.guest_EIP); 678 679 /* tell the tools */ 680 VG_TRACK( post_deliver_signal, tid, sigNo ); 681 } 682 683 #endif // defined(VGP_x86_linux) 684 685 /*--------------------------------------------------------------------*/ 686 /*--- end ---*/ 687 /*--------------------------------------------------------------------*/ 688
