1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515
|
/*--------------------------------------------------------------------*/
/*--- The address space manager: stuff common to all platforms ---*/
/*--- ---*/
/*--- m_aspacemgr-common.c ---*/
/*--------------------------------------------------------------------*/
/*
This file is part of Valgrind, a dynamic binary instrumentation
framework.
Copyright (C) 2006-2017 OpenWorks LLP
info@open-works.co.uk
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307, USA.
The GNU General Public License is contained in the file COPYING.
*/
/* *************************************************************
DO NOT INCLUDE ANY OTHER FILES HERE.
ADD NEW INCLUDES ONLY TO priv_aspacemgr.h
AND THEN ONLY AFTER READING DIRE WARNINGS THERE TOO.
************************************************************* */
#include "priv_aspacemgr.h"
#include "config.h"
/*-----------------------------------------------------------------*/
/*--- ---*/
/*--- Stuff to make aspacem almost completely independent of ---*/
/*--- the rest of Valgrind. ---*/
/*--- ---*/
/*-----------------------------------------------------------------*/
//--------------------------------------------------------------
// Simple assert and assert-like fns, which avoid dependence on
// m_libcassert, and hence on the entire debug-info reader swamp
__attribute__ ((noreturn))
void ML_(am_exit)( Int status )
{
VG_(exit_now) (status);
}
void ML_(am_barf) ( const HChar* what )
{
VG_(debugLog)(0, "aspacem", "Valgrind: FATAL: %s\n", what);
VG_(debugLog)(0, "aspacem", "Exiting now.\n");
ML_(am_exit)(1);
}
void ML_(am_barf_toolow) ( const HChar* what )
{
VG_(debugLog)(0, "aspacem",
"Valgrind: FATAL: %s is too low.\n", what);
VG_(debugLog)(0, "aspacem", " Increase it and rebuild. "
"Exiting now.\n");
ML_(am_exit)(1);
}
void ML_(am_assert_fail)( const HChar* expr,
const HChar* file,
Int line,
const HChar* fn )
{
VG_(debugLog)(0, "aspacem",
"Valgrind: FATAL: aspacem assertion failed:\n");
VG_(debugLog)(0, "aspacem", " %s\n", expr);
VG_(debugLog)(0, "aspacem", " at %s:%d (%s)\n", file,line,fn);
VG_(debugLog)(0, "aspacem", "Exiting now.\n");
ML_(am_exit)(1);
}
Int ML_(am_getpid)( void )
{
SysRes sres = VG_(do_syscall0)(__NR_getpid);
aspacem_assert(!sr_isError(sres));
return sr_Res(sres);
}
//--------------------------------------------------------------
// A simple sprintf implementation, so as to avoid dependence on
// m_libcprint.
static void local_add_to_aspacem_sprintf_buf ( HChar c, void *p )
{
HChar** aspacem_sprintf_ptr = p;
*(*aspacem_sprintf_ptr)++ = c;
}
static
UInt local_vsprintf ( HChar* buf, const HChar *format, va_list vargs )
{
Int ret;
HChar *aspacem_sprintf_ptr = buf;
ret = VG_(debugLog_vprintf)
( local_add_to_aspacem_sprintf_buf,
&aspacem_sprintf_ptr, format, vargs );
local_add_to_aspacem_sprintf_buf('\0', &aspacem_sprintf_ptr);
return ret;
}
UInt ML_(am_sprintf) ( HChar* buf, const HChar *format, ... )
{
UInt ret;
va_list vargs;
va_start(vargs,format);
ret = local_vsprintf(buf, format, vargs);
va_end(vargs);
return ret;
}
//--------------------------------------------------------------
// Direct access to a handful of syscalls. This avoids dependence on
// m_libc*. THESE DO NOT UPDATE THE aspacem-internal DATA
// STRUCTURES (SEGMENT ARRAY). DO NOT USE THEM UNLESS YOU KNOW WHAT
// YOU ARE DOING.
/* --- Pertaining to mappings --- */
/* Note: this is VG_, not ML_. */
SysRes VG_(am_do_mmap_NO_NOTIFY)( Addr start, SizeT length, UInt prot,
UInt flags, Int fd, Off64T offset)
{
SysRes res;
aspacem_assert(VG_IS_PAGE_ALIGNED(offset));
# if defined(VGP_arm64_linux)
res = VG_(do_syscall6)(__NR3264_mmap, (UWord)start, length,
prot, flags, fd, offset);
# elif defined(VGP_x86_linux) || defined(VGP_ppc32_linux) \
|| defined(VGP_arm_linux)
/* mmap2 uses 4096 chunks even if actual page size is bigger. */
aspacem_assert((offset % 4096) == 0);
res = VG_(do_syscall6)(__NR_mmap2, (UWord)start, length,
prot, flags, fd, offset / 4096);
# elif defined(VGP_amd64_linux) \
|| defined(VGP_ppc64be_linux) || defined(VGP_ppc64le_linux) \
|| defined(VGP_s390x_linux) || defined(VGP_mips32_linux) \
|| defined(VGP_mips64_linux) || defined(VGP_arm64_linux)
res = VG_(do_syscall6)(__NR_mmap, (UWord)start, length,
prot, flags, fd, offset);
# elif defined(VGP_x86_darwin)
if (fd == 0 && (flags & VKI_MAP_ANONYMOUS)) {
fd = -1; // MAP_ANON with fd==0 is EINVAL
}
res = VG_(do_syscall7)(__NR_mmap, (UWord)start, length,
prot, flags, fd, offset & 0xffffffff, offset >> 32);
# elif defined(VGP_amd64_darwin)
if (fd == 0 && (flags & VKI_MAP_ANONYMOUS)) {
fd = -1; // MAP_ANON with fd==0 is EINVAL
}
res = VG_(do_syscall6)(__NR_mmap, (UWord)start, length,
prot, flags, (UInt)fd, offset);
# elif defined(VGP_x86_solaris)
/* MAP_ANON with fd==0 is EINVAL. */
if (fd == 0 && (flags & VKI_MAP_ANONYMOUS))
fd = -1;
res = VG_(do_syscall7)(__NR_mmap64, (UWord)start, length, prot, flags,
(UInt)fd, offset & 0xffffffff, offset >> 32);
# elif defined(VGP_amd64_solaris)
/* MAP_ANON with fd==0 is EINVAL. */
if (fd == 0 && (flags & VKI_MAP_ANONYMOUS))
fd = -1;
res = VG_(do_syscall6)(__NR_mmap, (UWord)start, length, prot, flags,
(UInt)fd, offset);
# else
# error Unknown platform
# endif
return res;
}
static
SysRes local_do_mprotect_NO_NOTIFY(Addr start, SizeT length, UInt prot)
{
return VG_(do_syscall3)(__NR_mprotect, (UWord)start, length, prot );
}
SysRes ML_(am_do_munmap_NO_NOTIFY)(Addr start, SizeT length)
{
return VG_(do_syscall2)(__NR_munmap, (UWord)start, length );
}
#if HAVE_MREMAP
/* The following are used only to implement mremap(). */
SysRes ML_(am_do_extend_mapping_NO_NOTIFY)(
Addr old_addr,
SizeT old_len,
SizeT new_len
)
{
/* Extend the mapping old_addr .. old_addr+old_len-1 to have length
new_len, WITHOUT moving it. If it can't be extended in place,
fail. */
# if defined(VGO_linux)
return VG_(do_syscall5)(
__NR_mremap,
old_addr, old_len, new_len,
0/*flags, meaning: must be at old_addr, else FAIL */,
0/*new_addr, is ignored*/
);
# else
# error Unknown OS
# endif
}
SysRes ML_(am_do_relocate_nooverlap_mapping_NO_NOTIFY)(
Addr old_addr, Addr old_len,
Addr new_addr, Addr new_len
)
{
/* Move the mapping old_addr .. old_addr+old_len-1 to the new
location and with the new length. Only needs to handle the case
where the two areas do not overlap, neither length is zero, and
all args are page aligned. */
# if defined(VGO_linux)
return VG_(do_syscall5)(
__NR_mremap,
old_addr, old_len, new_len,
VKI_MREMAP_MAYMOVE|VKI_MREMAP_FIXED/*move-or-fail*/,
new_addr
);
# else
# error Unknown OS
# endif
}
#endif
/* --- Pertaining to files --- */
SysRes ML_(am_open) ( const HChar* pathname, Int flags, Int mode )
{
# if defined(VGP_arm64_linux)
/* ARM64 wants to use __NR_openat rather than __NR_open. */
SysRes res = VG_(do_syscall4)(__NR_openat,
VKI_AT_FDCWD, (UWord)pathname, flags, mode);
# elif defined(VGO_linux) || defined(VGO_darwin)
SysRes res = VG_(do_syscall3)(__NR_open, (UWord)pathname, flags, mode);
# elif defined(VGO_solaris)
SysRes res = VG_(do_syscall4)(__NR_openat, VKI_AT_FDCWD, (UWord)pathname,
flags, mode);
# else
# error Unknown OS
# endif
return res;
}
Int ML_(am_read) ( Int fd, void* buf, Int count)
{
SysRes res = VG_(do_syscall3)(__NR_read, fd, (UWord)buf, count);
return sr_isError(res) ? -1 : sr_Res(res);
}
void ML_(am_close) ( Int fd )
{
(void)VG_(do_syscall1)(__NR_close, fd);
}
Int ML_(am_readlink)(const HChar* path, HChar* buf, UInt bufsiz)
{
SysRes res;
# if defined(VGP_arm64_linux)
res = VG_(do_syscall4)(__NR_readlinkat, VKI_AT_FDCWD,
(UWord)path, (UWord)buf, bufsiz);
# elif defined(VGO_linux) || defined(VGO_darwin)
res = VG_(do_syscall3)(__NR_readlink, (UWord)path, (UWord)buf, bufsiz);
# elif defined(VGO_solaris)
res = VG_(do_syscall4)(__NR_readlinkat, VKI_AT_FDCWD, (UWord)path,
(UWord)buf, bufsiz);
# else
# error Unknown OS
# endif
return sr_isError(res) ? -1 : sr_Res(res);
}
Int ML_(am_fcntl) ( Int fd, Int cmd, Addr arg )
{
# if defined(VGO_linux) || defined(VGO_solaris)
SysRes res = VG_(do_syscall3)(__NR_fcntl, fd, cmd, arg);
# elif defined(VGO_darwin)
SysRes res = VG_(do_syscall3)(__NR_fcntl_nocancel, fd, cmd, arg);
# else
# error "Unknown OS"
# endif
return sr_isError(res) ? -1 : sr_Res(res);
}
/* Get the dev, inode and mode info for a file descriptor, if
possible. Returns True on success. */
Bool ML_(am_get_fd_d_i_m)( Int fd,
/*OUT*/ULong* dev,
/*OUT*/ULong* ino, /*OUT*/UInt* mode )
{
# if defined(VGO_linux) || defined(VGO_darwin)
SysRes res;
struct vki_stat buf;
# if defined(VGO_linux) && defined(__NR_fstat64)
/* Try fstat64 first as it can cope with minor and major device
numbers outside the 0-255 range and it works properly for x86
binaries on amd64 systems where fstat seems to be broken. */
struct vki_stat64 buf64;
res = VG_(do_syscall2)(__NR_fstat64, fd, (UWord)&buf64);
if (!sr_isError(res)) {
*dev = (ULong)buf64.st_dev;
*ino = (ULong)buf64.st_ino;
*mode = (UInt) buf64.st_mode;
return True;
}
# endif
res = VG_(do_syscall2)(__NR_fstat, fd, (UWord)&buf);
if (!sr_isError(res)) {
*dev = (ULong)buf.st_dev;
*ino = (ULong)buf.st_ino;
*mode = (UInt) buf.st_mode;
return True;
}
return False;
# elif defined(VGO_solaris)
# if defined(VGP_x86_solaris)
struct vki_stat64 buf64;
SysRes res = VG_(do_syscall4)(__NR_fstatat64, fd, 0, (UWord)&buf64, 0);
# elif defined(VGP_amd64_solaris)
struct vki_stat buf64;
SysRes res = VG_(do_syscall4)(__NR_fstatat, fd, 0, (UWord)&buf64, 0);
# else
# error "Unknown platform"
# endif
if (!sr_isError(res)) {
*dev = (ULong)buf64.st_dev;
*ino = (ULong)buf64.st_ino;
*mode = (UInt) buf64.st_mode;
return True;
}
return False;
# else
# error Unknown OS
# endif
}
Bool ML_(am_resolve_filename) ( Int fd, /*OUT*/HChar* buf, Int nbuf )
{
#if defined(VGO_linux)
Int i;
HChar tmp[64]; // large enough
for (i = 0; i < nbuf; i++) buf[i] = 0;
ML_(am_sprintf)(tmp, "/proc/self/fd/%d", fd);
if (ML_(am_readlink)(tmp, buf, nbuf) > 0 && buf[0] == '/')
return True;
else
return False;
#elif defined(VGO_darwin)
HChar tmp[VKI_MAXPATHLEN+1];
if (0 == ML_(am_fcntl)(fd, VKI_F_GETPATH, (UWord)tmp)) {
if (nbuf > 0) {
VG_(strncpy)( buf, tmp, nbuf < sizeof(tmp) ? nbuf : sizeof(tmp) );
buf[nbuf-1] = 0;
}
if (tmp[0] == '/') return True;
}
return False;
#elif defined(VGO_solaris)
Int i;
HChar tmp[64];
for (i = 0; i < nbuf; i++) buf[i] = 0;
ML_(am_sprintf)(tmp, "/proc/self/path/%d", fd);
if (ML_(am_readlink)(tmp, buf, nbuf) > 0 && buf[0] == '/')
return True;
else
return False;
# else
# error Unknown OS
# endif
}
/*-----------------------------------------------------------------*/
/*--- ---*/
/*--- Manage stacks for Valgrind itself. ---*/
/*--- ---*/
/*-----------------------------------------------------------------*/
struct _VgStack {
HChar bytes[1];
// We use a fake size of 1. A bigger size is allocated
// by VG_(am_alloc_VgStack).
};
/* Allocate and initialise a VgStack (anonymous valgrind space).
Protect the stack active area and the guard areas appropriately.
Returns NULL on failure, else the address of the bottom of the
stack. On success, also sets *initial_sp to what the stack pointer
should be set to. */
VgStack* VG_(am_alloc_VgStack)( /*OUT*/Addr* initial_sp )
{
Int szB;
SysRes sres;
VgStack* stack;
UInt* p;
Int i;
/* Allocate the stack. */
szB = VG_STACK_GUARD_SZB
+ VG_(clo_valgrind_stacksize) + VG_STACK_GUARD_SZB;
sres = VG_(am_mmap_anon_float_valgrind)( szB );
if (sr_isError(sres))
return NULL;
stack = (VgStack*)(Addr)sr_Res(sres);
aspacem_assert(VG_IS_PAGE_ALIGNED(szB));
aspacem_assert(VG_IS_PAGE_ALIGNED(stack));
/* Protect the guard areas. */
sres = local_do_mprotect_NO_NOTIFY(
(Addr) &stack[0],
VG_STACK_GUARD_SZB, VKI_PROT_NONE
);
if (sr_isError(sres)) goto protect_failed;
VG_(am_notify_mprotect)(
(Addr) &stack->bytes[0],
VG_STACK_GUARD_SZB, VKI_PROT_NONE
);
sres = local_do_mprotect_NO_NOTIFY(
(Addr) &stack->bytes[VG_STACK_GUARD_SZB + VG_(clo_valgrind_stacksize)],
VG_STACK_GUARD_SZB, VKI_PROT_NONE
);
if (sr_isError(sres)) goto protect_failed;
VG_(am_notify_mprotect)(
(Addr) &stack->bytes[VG_STACK_GUARD_SZB + VG_(clo_valgrind_stacksize)],
VG_STACK_GUARD_SZB, VKI_PROT_NONE
);
/* Looks good. Fill the active area with junk so we can later
tell how much got used. */
p = (UInt*)&stack->bytes[VG_STACK_GUARD_SZB];
for (i = 0; i < VG_(clo_valgrind_stacksize)/sizeof(UInt); i++)
p[i] = 0xDEADBEEF;
*initial_sp = (Addr)&stack->bytes[VG_STACK_GUARD_SZB + VG_(clo_valgrind_stacksize)];
*initial_sp -= 8;
*initial_sp &= ~((Addr)0x1F); /* 32-align it */
VG_(debugLog)( 1,"aspacem",
"allocated valgrind thread stack at 0x%llx size %d\n",
(ULong)(Addr)stack, szB);
ML_(am_do_sanity_check)();
return stack;
protect_failed:
/* The stack was allocated, but we can't protect it. Unmap it and
return NULL (failure). */
(void)ML_(am_do_munmap_NO_NOTIFY)( (Addr)stack, szB );
ML_(am_do_sanity_check)();
return NULL;
}
/* Figure out how many bytes of the stack's active area have not
been used. Used for estimating if we are close to overflowing it. */
SizeT VG_(am_get_VgStack_unused_szB)( const VgStack* stack, SizeT limit )
{
SizeT i;
const UInt* p;
p = (const UInt*)&stack->bytes[VG_STACK_GUARD_SZB];
for (i = 0; i < VG_(clo_valgrind_stacksize)/sizeof(UInt); i++) {
if (p[i] != 0xDEADBEEF)
break;
if (i * sizeof(UInt) >= limit)
break;
}
return i * sizeof(UInt);
}
Addr VG_(am_valgrind_stack_low_addr)( const VgStack* stack)
{
return (Addr)&stack->bytes[VG_STACK_GUARD_SZB];
}
/*--------------------------------------------------------------------*/
/*--- end ---*/
/*--------------------------------------------------------------------*/
|