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bb0ff0ee263c4bd3e85fdfd649db150b0d5dc501
ftmemsim-valgrind/addrcheck/ac_main.c
Nicholas Nethercote f1f707c7b2 This change reduces the number of calls to dlsym() when loading tools from a 
lot to one.  This required two basic changes.

1. Tools are responsible for telling the tool about any functions they
provide that the tool may call.  This includes basic functions like
TL_(instrument)(), functions that assist core services such as
TL_(pp_Error)(), and malloc-replacement-related functions like
TL_(malloc)().  

2. Tools that replace malloc now specify the size of the heap block redzones
through an arg to the VG_(malloc_funcs)() function, rather than with a
variable VG_(vg_malloc_redzone_szB).

One consequence of these changes is that VG_(tool_init_dlsym)() no longer
needs to be generated by gen_toolint.pl.

There are a number of further improvements that could follow on from this one.
- Avoid the confusingly different definitions of the TL_() macro in the
  core vs. for tools.  Indeed, the functions provided by the tools now don't
  need to use the TL_() macro at all, as they can have arbitrary names.
- Remove a lot of the auto-generated stuff in vg_toolint.c and vg_toolint.h
  (indeed, it might be possible to not auto-generate these at all, which
  would be nice).
- The handling of VgToolInterface is currently split across vg_needs.c and
  vg_toolint.c, which isn't nice.



git-svn-id: svn://svn.valgrind.org/valgrind/trunk@3487
2005-03-31 04:37:24 +00:00

1415 lines
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/*--------------------------------------------------------------------*/
/*--- The AddrCheck tool: like MemCheck, but only does address ---*/
/*--- checking. No definedness checking. ---*/
/*--- ac_main.c ---*/
/*--------------------------------------------------------------------*/
/*
This file is part of AddrCheck, a lightweight Valgrind tool for
detecting memory errors.
Copyright (C) 2000-2005 Julian Seward
jseward@acm.org
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.
*/
#include "mac_shared.h"
#include "memcheck.h"
//#include "vg_profile.c"
/*------------------------------------------------------------*/
/*--- Comparing and printing errors ---*/
/*------------------------------------------------------------*/
void TL_(pp_Error) ( Error* err )
{
MAC_Error* err_extra = VG_(get_error_extra)(err);
switch (VG_(get_error_kind)(err)) {
case CoreMemErr:
VG_(message)(Vg_UserMsg, "%s contains unaddressable byte(s)",
VG_(get_error_string)(err));
VG_(pp_ExeContext)( VG_(get_error_where)(err) );
break;
case ParamErr:
VG_(message)(Vg_UserMsg,
"Syscall param %s contains unaddressable byte(s)",
VG_(get_error_string)(err) );
VG_(pp_ExeContext)( VG_(get_error_where)(err) );
MAC_(pp_AddrInfo)(VG_(get_error_address)(err), &err_extra->addrinfo);
break;
case UserErr:
VG_(message)(Vg_UserMsg,
"Unaddressable byte(s) found during client check request");
VG_(pp_ExeContext)( VG_(get_error_where)(err) );
MAC_(pp_AddrInfo)(VG_(get_error_address)(err), &err_extra->addrinfo);
break;
default:
MAC_(pp_shared_Error)(err);
break;
}
}
/*------------------------------------------------------------*/
/*--- Suppressions ---*/
/*------------------------------------------------------------*/
Bool TL_(recognised_suppression) ( Char* name, Supp* su )
{
return MAC_(shared_recognised_suppression)(name, su);
}
#define DEBUG(fmt, args...) //VG_(printf)(fmt, ## args)
/*------------------------------------------------------------*/
/*--- Low-level support for memory checking. ---*/
/*------------------------------------------------------------*/
/* All reads and writes are checked against a memory map, which
records the state of all memory in the process. The memory map is
organised like this:
The top 16 bits of an address are used to index into a top-level
map table, containing 65536 entries. Each entry is a pointer to a
second-level map, which records the accesibililty and validity
permissions for the 65536 bytes indexed by the lower 16 bits of the
address. Each byte is represented by one bit, indicating
accessibility. So each second-level map contains 8192 bytes. This
two-level arrangement conveniently divides the 4G address space
into 64k lumps, each size 64k bytes.
All entries in the primary (top-level) map must point to a valid
secondary (second-level) map. Since most of the 4G of address
space will not be in use -- ie, not mapped at all -- there is a
distinguished secondary map, which indicates `not addressible and
not valid' writeable for all bytes. Entries in the primary map for
which the entire 64k is not in use at all point at this
distinguished map.
[...] lots of stuff deleted due to out of date-ness
As a final optimisation, the alignment and address checks for
4-byte loads and stores are combined in a neat way. The primary
map is extended to have 262144 entries (2^18), rather than 2^16.
The top 3/4 of these entries are permanently set to the
distinguished secondary map. For a 4-byte load/store, the
top-level map is indexed not with (addr >> 16) but instead f(addr),
where
f( XXXX XXXX XXXX XXXX ____ ____ ____ __YZ )
= ____ ____ ____ __YZ XXXX XXXX XXXX XXXX or
= ____ ____ ____ __ZY XXXX XXXX XXXX XXXX
ie the lowest two bits are placed above the 16 high address bits.
If either of these two bits are nonzero, the address is misaligned;
this will select a secondary map from the upper 3/4 of the primary
map. Because this is always the distinguished secondary map, a
(bogus) address check failure will result. The failure handling
code can then figure out whether this is a genuine addr check
failure or whether it is a possibly-legitimate access at a
misaligned address. */
/*------------------------------------------------------------*/
/*--- Function declarations. ---*/
/*------------------------------------------------------------*/
static void ac_ACCESS4_SLOWLY ( Addr a, Bool isWrite );
static void ac_ACCESS2_SLOWLY ( Addr a, Bool isWrite );
static void ac_ACCESS1_SLOWLY ( Addr a, Bool isWrite );
static void ac_fpu_ACCESS_check_SLOWLY ( Addr addr, SizeT size, Bool isWrite );
/*------------------------------------------------------------*/
/*--- Data defns. ---*/
/*------------------------------------------------------------*/
typedef
struct {
UChar abits[SECONDARY_SIZE / 8];
}
AcSecMap;
static AcSecMap* primary_map[ /*PRIMARY_SIZE*/ PRIMARY_SIZE*4 ];
static const AcSecMap distinguished_secondary_maps[2] = {
[ VGM_BIT_INVALID ] = { { [0 ... (SECONDARY_SIZE/8) - 1] = VGM_BYTE_INVALID } },
[ VGM_BIT_VALID ] = { { [0 ... (SECONDARY_SIZE/8) - 1] = VGM_BYTE_VALID } },
};
#define N_SECONDARY_MAPS (sizeof(distinguished_secondary_maps)/sizeof(*distinguished_secondary_maps))
#define DSM_IDX(a) ((a) & 1)
#define DSM(a) ((AcSecMap *)&distinguished_secondary_maps[DSM_IDX(a)])
#define DSM_NOTADDR DSM(VGM_BIT_INVALID)
#define DSM_ADDR DSM(VGM_BIT_VALID)
static void init_shadow_memory ( void )
{
Int i, a;
/* check construction of the distinguished secondaries */
tl_assert(VGM_BIT_INVALID == 1);
tl_assert(VGM_BIT_VALID == 0);
for(a = 0; a <= 1; a++)
tl_assert(distinguished_secondary_maps[DSM_IDX(a)].abits[0] == BIT_EXPAND(a));
/* These entries gradually get overwritten as the used address
space expands. */
for (i = 0; i < PRIMARY_SIZE; i++)
primary_map[i] = DSM_NOTADDR;
/* These ones should never change; it's a bug in Valgrind if they do. */
for (i = PRIMARY_SIZE; i < PRIMARY_SIZE*4; i++)
primary_map[i] = DSM_NOTADDR;
}
/*------------------------------------------------------------*/
/*--- Basic bitmap management, reading and writing. ---*/
/*------------------------------------------------------------*/
/* Allocate and initialise a secondary map. */
static AcSecMap* alloc_secondary_map ( __attribute__ ((unused))
Char* caller,
const AcSecMap *prototype)
{
AcSecMap* map;
PROF_EVENT(10);
map = (AcSecMap *)VG_(shadow_alloc)(sizeof(AcSecMap));
VG_(memcpy)(map, prototype, sizeof(*map));
/* VG_(printf)("ALLOC_2MAP(%s)\n", caller ); */
return map;
}
/* Basic reading/writing of the bitmaps, for byte-sized accesses. */
static __inline__ UChar get_abit ( Addr a )
{
AcSecMap* sm = primary_map[PM_IDX(a)];
UInt sm_off = SM_OFF(a);
PROF_EVENT(20);
# if 0
if (IS_DISTINGUISHED_SM(sm))
VG_(message)(Vg_DebugMsg,
"accessed distinguished 2ndary (A)map! 0x%x\n", a);
# endif
return BITARR_TEST(sm->abits, sm_off)
? VGM_BIT_INVALID : VGM_BIT_VALID;
}
static /* __inline__ */ void set_abit ( Addr a, UChar abit )
{
AcSecMap* sm;
UInt sm_off;
PROF_EVENT(22);
ENSURE_MAPPABLE(a, "set_abit");
sm = primary_map[PM_IDX(a)];
sm_off = SM_OFF(a);
if (abit)
BITARR_SET(sm->abits, sm_off);
else
BITARR_CLEAR(sm->abits, sm_off);
}
/* Reading/writing of the bitmaps, for aligned word-sized accesses. */
static __inline__ UChar get_abits4_ALIGNED ( Addr a )
{
AcSecMap* sm;
UInt sm_off;
UChar abits8;
PROF_EVENT(24);
# ifdef VG_DEBUG_MEMORY
tl_assert(VG_IS_4_ALIGNED(a));
# endif
sm = primary_map[PM_IDX(a)];
sm_off = SM_OFF(a);
abits8 = sm->abits[sm_off >> 3];
abits8 >>= (a & 4 /* 100b */); /* a & 4 is either 0 or 4 */
abits8 &= 0x0F;
return abits8;
}
/*------------------------------------------------------------*/
/*--- Setting permissions over address ranges. ---*/
/*------------------------------------------------------------*/
static /* __inline__ */
void set_address_range_perms ( Addr a, SizeT len, UInt example_a_bit )
{
UChar abyte8;
UInt sm_off;
AcSecMap* sm;
PROF_EVENT(30);
if (len == 0)
return;
if (len > 100 * 1000 * 1000) {
VG_(message)(Vg_UserMsg,
"Warning: set address range perms: "
"large range %u, a %d",
len, example_a_bit );
}
VGP_PUSHCC(VgpSetMem);
/* Requests to change permissions of huge address ranges may
indicate bugs in our machinery. 30,000,000 is arbitrary, but so
far all legitimate requests have fallen beneath that size. */
/* 4 Mar 02: this is just stupid; get rid of it. */
/* tl_assert(len < 30000000); */
/* Check the permissions make sense. */
tl_assert(example_a_bit == VGM_BIT_VALID
|| example_a_bit == VGM_BIT_INVALID);
/* In order that we can charge through the address space at 8
bytes/main-loop iteration, make up some perms. */
abyte8 = BIT_EXPAND(example_a_bit);
# ifdef VG_DEBUG_MEMORY
/* Do it ... */
while (True) {
PROF_EVENT(31);
if (len == 0) break;
set_abit ( a, example_a_bit );
set_vbyte ( a, vbyte );
a++;
len--;
}
# else
/* Slowly do parts preceding 8-byte alignment. */
while (True) {
PROF_EVENT(31);
if (len == 0) break;
if ((a % 8) == 0) break;
set_abit ( a, example_a_bit );
a++;
len--;
}
if (len == 0) {
VGP_POPCC(VgpSetMem);
return;
}
tl_assert((a % 8) == 0 && len > 0);
/* Once aligned, go fast up to primary boundary. */
for (; (a & SECONDARY_MASK) && len >= 8; a += 8, len -= 8) {
PROF_EVENT(32);
/* If the primary is already pointing to a distinguished map
with the same properties as we're trying to set, then leave
it that way. */
if (primary_map[PM_IDX(a)] == DSM(example_a_bit))
continue;
ENSURE_MAPPABLE(a, "set_address_range_perms(fast)");
sm = primary_map[PM_IDX(a)];
sm_off = SM_OFF(a);
sm->abits[sm_off >> 3] = abyte8;
}
/* Now set whole secondary maps to the right distinguished value.
Note that if the primary already points to a non-distinguished
secondary, then don't replace the reference. That would just
leak memory.
*/
for(; len >= SECONDARY_SIZE; a += SECONDARY_SIZE, len -= SECONDARY_SIZE) {
sm = primary_map[PM_IDX(a)];
if (IS_DISTINGUISHED_SM(sm))
primary_map[PM_IDX(a)] = DSM(example_a_bit);
else
VG_(memset)(sm->abits, abyte8, sizeof(sm->abits));
}
/* Now finished the remains. */
for (; len >= 8; a += 8, len -= 8) {
PROF_EVENT(32);
/* If the primary is already pointing to a distinguished map
with the same properties as we're trying to set, then leave
it that way. */
if (primary_map[PM_IDX(a)] == DSM(example_a_bit))
continue;
ENSURE_MAPPABLE(a, "set_address_range_perms(fast)");
sm = primary_map[PM_IDX(a)];
sm_off = SM_OFF(a);
sm->abits[sm_off >> 3] = abyte8;
}
/* Finish the upper fragment. */
while (True) {
PROF_EVENT(33);
if (len == 0) break;
set_abit ( a, example_a_bit );
a++;
len--;
}
# endif
/* Check that zero page and highest page have not been written to
-- this could happen with buggy syscall wrappers. Today
(2001-04-26) had precisely such a problem with __NR_setitimer. */
tl_assert(TL_(cheap_sanity_check)());
VGP_POPCC(VgpSetMem);
}
/* Set permissions for address ranges ... */
static void ac_make_noaccess ( Addr a, SizeT len )
{
PROF_EVENT(35);
DEBUG("ac_make_noaccess(%p, %x)\n", a, len);
set_address_range_perms ( a, len, VGM_BIT_INVALID );
}
static void ac_make_accessible ( Addr a, SizeT len )
{
PROF_EVENT(38);
DEBUG("ac_make_accessible(%p, %x)\n", a, len);
set_address_range_perms ( a, len, VGM_BIT_VALID );
}
static __inline__
void make_aligned_word_noaccess(Addr a)
{
AcSecMap* sm;
UInt sm_off;
UChar mask;
VGP_PUSHCC(VgpESPAdj);
ENSURE_MAPPABLE(a, "make_aligned_word_noaccess");
sm = primary_map[PM_IDX(a)];
sm_off = SM_OFF(a);
mask = 0x0F;
mask <<= (a & 4 /* 100b */); /* a & 4 is either 0 or 4 */
/* mask now contains 1s where we wish to make address bits invalid (1s). */
sm->abits[sm_off >> 3] |= mask;
VGP_POPCC(VgpESPAdj);
}
static __inline__
void make_aligned_word_accessible(Addr a)
{
AcSecMap* sm;
UInt sm_off;
UChar mask;
VGP_PUSHCC(VgpESPAdj);
ENSURE_MAPPABLE(a, "make_aligned_word_accessible");
sm = primary_map[PM_IDX(a)];
sm_off = SM_OFF(a);
mask = 0x0F;
mask <<= (a & 4 /* 100b */); /* a & 4 is either 0 or 4 */
/* mask now contains 1s where we wish to make address bits
invalid (0s). */
sm->abits[sm_off >> 3] &= ~mask;
VGP_POPCC(VgpESPAdj);
}
/* Nb: by "aligned" here we mean 8-byte aligned */
static __inline__
void make_aligned_doubleword_accessible(Addr a)
{
AcSecMap* sm;
UInt sm_off;
VGP_PUSHCC(VgpESPAdj);
ENSURE_MAPPABLE(a, "make_aligned_doubleword_accessible");
sm = primary_map[PM_IDX(a)];
sm_off = SM_OFF(a);
sm->abits[sm_off >> 3] = VGM_BYTE_VALID;
VGP_POPCC(VgpESPAdj);
}
static __inline__
void make_aligned_doubleword_noaccess(Addr a)
{
AcSecMap* sm;
UInt sm_off;
VGP_PUSHCC(VgpESPAdj);
ENSURE_MAPPABLE(a, "make_aligned_doubleword_noaccess");
sm = primary_map[PM_IDX(a)];
sm_off = SM_OFF(a);
sm->abits[sm_off >> 3] = VGM_BYTE_INVALID;
VGP_POPCC(VgpESPAdj);
}
/* The %esp update handling functions */
ESP_UPDATE_HANDLERS ( make_aligned_word_accessible,
make_aligned_word_noaccess,
make_aligned_doubleword_accessible,
make_aligned_doubleword_noaccess,
ac_make_accessible,
ac_make_noaccess
);
/* Block-copy permissions (needed for implementing realloc()). */
static void ac_copy_address_range_state ( Addr src, Addr dst, SizeT len )
{
UInt i;
DEBUG("ac_copy_address_range_state\n");
PROF_EVENT(40);
for (i = 0; i < len; i++) {
UChar abit = get_abit ( src+i );
PROF_EVENT(41);
set_abit ( dst+i, abit );
}
}
/* Check permissions for address range. If inadequate permissions
exist, *bad_addr is set to the offending address, so the caller can
know what it is. */
static __inline__
Bool ac_check_accessible ( Addr a, SizeT len, Addr* bad_addr )
{
UInt i;
UChar abit;
PROF_EVENT(48);
for (i = 0; i < len; i++) {
PROF_EVENT(49);
abit = get_abit(a);
if (abit == VGM_BIT_INVALID) {
if (bad_addr != NULL) *bad_addr = a;
return False;
}
a++;
}
return True;
}
/* The opposite; check that an address range is inaccessible. */
static
Bool ac_check_noaccess ( Addr a, SizeT len, Addr* bad_addr )
{
UInt i;
UChar abit;
PROF_EVENT(48);
for (i = 0; i < len; i++) {
PROF_EVENT(49);
abit = get_abit(a);
if (abit == VGM_BIT_VALID) {
if (bad_addr != NULL) *bad_addr = a;
return False;
}
a++;
}
return True;
}
/* Check a zero-terminated ascii string. Tricky -- don't want to
examine the actual bytes, to find the end, until we're sure it is
safe to do so. */
static __inline__
Bool ac_check_readable_asciiz ( Addr a, Addr* bad_addr )
{
UChar abit;
PROF_EVENT(46);
DEBUG("ac_check_readable_asciiz\n");
while (True) {
PROF_EVENT(47);
abit = get_abit(a);
if (abit != VGM_BIT_VALID) {
if (bad_addr != NULL) *bad_addr = a;
return False;
}
/* Ok, a is safe to read. */
if (* ((UChar*)a) == 0) return True;
a++;
}
}
/*------------------------------------------------------------*/
/*--- Memory event handlers ---*/
/*------------------------------------------------------------*/
static __inline__
void ac_check_is_accessible ( CorePart part, ThreadId tid,
Char* s, Addr base, SizeT size, Bool isWrite )
{
Bool ok;
Addr bad_addr = 0; // Initialise to shut gcc up
VGP_PUSHCC(VgpCheckMem);
ok = ac_check_accessible ( base, size, &bad_addr );
if (!ok) {
switch (part) {
case Vg_CoreSysCall:
MAC_(record_param_error) ( tid, bad_addr, /*isReg*/False,
/*isUnaddr*/True, s );
break;
case Vg_CoreSignal:
tl_assert(isWrite); /* Should only happen with isWrite case */
/* fall through */
case Vg_CorePThread:
MAC_(record_core_mem_error)( tid, /*isUnaddr*/True, s );
break;
/* If we're being asked to jump to a silly address, record an error
message before potentially crashing the entire system. */
case Vg_CoreTranslate:
tl_assert(!isWrite); /* Should only happen with !isWrite case */
MAC_(record_jump_error)( tid, bad_addr );
break;
default:
VG_(tool_panic)("ac_check_is_accessible: unexpected CorePart");
}
}
VGP_POPCC(VgpCheckMem);
}
static
void ac_check_is_writable ( CorePart part, ThreadId tid,
Char* s, Addr base, SizeT size )
{
ac_check_is_accessible ( part, tid, s, base, size, /*isWrite*/True );
}
static
void ac_check_is_readable ( CorePart part, ThreadId tid,
Char* s, Addr base, SizeT size )
{
ac_check_is_accessible ( part, tid, s, base, size, /*isWrite*/False );
}
static
void ac_check_is_readable_asciiz ( CorePart part, ThreadId tid,
Char* s, Addr str )
{
Bool ok = True;
Addr bad_addr = 0; // Initialise to shut gcc up
VGP_PUSHCC(VgpCheckMem);
tl_assert(part == Vg_CoreSysCall);
ok = ac_check_readable_asciiz ( (Addr)str, &bad_addr );
if (!ok) {
MAC_(record_param_error) ( tid, bad_addr, /*IsReg*/False,
/*IsUnaddr*/True, s );
}
VGP_POPCC(VgpCheckMem);
}
static
void ac_new_mem_startup( Addr a, SizeT len, Bool rr, Bool ww, Bool xx )
{
/* Ignore the permissions, just make it readable. Seems to work... */
DEBUG("new_mem_startup(%p, %u, rr=%u, ww=%u, xx=%u)\n", a,len,rr,ww,xx);
ac_make_accessible(a, len);
}
static
void ac_new_mem_heap ( Addr a, SizeT len, Bool is_inited )
{
ac_make_accessible(a, len);
}
static
void ac_new_mem_mmap (Addr a, SizeT len, Bool rr, Bool ww, Bool xx)
{
DEBUG("ac_set_perms(%p, %u, rr=%u ww=%u, xx=%u)\n",
a, len, rr, ww, xx);
ac_make_accessible(a, len);
}
static
void ac_post_mem_write(CorePart part, ThreadId tid, Addr a, SizeT len)
{
ac_make_accessible(a, len);
}
/*------------------------------------------------------------*/
/*--- Functions called directly from generated code. ---*/
/*------------------------------------------------------------*/
static __inline__ UInt rotateRight16 ( UInt x )
{
/* Amazingly, gcc turns this into a single rotate insn. */
return (x >> 16) | (x << 16);
}
static __inline__ UInt shiftRight16 ( UInt x )
{
return x >> 16;
}
/* Read/write 1/2/4 sized V bytes, and emit an address error if
needed. */
/* ac_helperc_ACCESS{1,2,4} handle the common case fast.
Under all other circumstances, it defers to the relevant _SLOWLY
function, which can handle all situations.
*/
static __inline__ void ac_helperc_ACCESS4 ( Addr a, Bool isWrite )
{
# ifdef VG_DEBUG_MEMORY
return ac_ACCESS4_SLOWLY(a, isWrite);
# else
UInt sec_no = rotateRight16(a) & 0x3FFFF;
AcSecMap* sm = primary_map[sec_no];
UInt a_off = (SM_OFF(a)) >> 3;
UChar abits = sm->abits[a_off];
abits >>= (a & 4);
abits &= 15;
PROF_EVENT(66);
if (abits == VGM_NIBBLE_VALID) {
/* Handle common case quickly: a is suitably aligned, is mapped,
and is addressible. So just return. */
return;
} else {
/* Slow but general case. */
ac_ACCESS4_SLOWLY(a, isWrite);
}
# endif
}
static __inline__ void ac_helperc_ACCESS2 ( Addr a, Bool isWrite )
{
# ifdef VG_DEBUG_MEMORY
return ac_ACCESS2_SLOWLY(a, isWrite);
# else
UInt sec_no = rotateRight16(a) & 0x1FFFF;
AcSecMap* sm = primary_map[sec_no];
UInt a_off = (SM_OFF(a)) >> 3;
PROF_EVENT(67);
if (sm->abits[a_off] == VGM_BYTE_VALID) {
/* Handle common case quickly. */
return;
} else {
/* Slow but general case. */
ac_ACCESS2_SLOWLY(a, isWrite);
}
# endif
}
static __inline__ void ac_helperc_ACCESS1 ( Addr a, Bool isWrite )
{
# ifdef VG_DEBUG_MEMORY
return ac_ACCESS1_SLOWLY(a, isWrite);
# else
UInt sec_no = shiftRight16(a);
AcSecMap* sm = primary_map[sec_no];
UInt a_off = (SM_OFF(a)) >> 3;
PROF_EVENT(68);
if (sm->abits[a_off] == VGM_BYTE_VALID) {
/* Handle common case quickly. */
return;
} else {
/* Slow but general case. */
ac_ACCESS1_SLOWLY(a, isWrite);
}
# endif
}
VGA_REGPARM(1)
static void ach_LOAD4 ( Addr a )
{
ac_helperc_ACCESS4 ( a, /*isWrite*/False );
}
VGA_REGPARM(1)
static void ach_STORE4 ( Addr a )
{
ac_helperc_ACCESS4 ( a, /*isWrite*/True );
}
VGA_REGPARM(1)
static void ach_LOAD2 ( Addr a )
{
ac_helperc_ACCESS2 ( a, /*isWrite*/False );
}
VGA_REGPARM(1)
static void ach_STORE2 ( Addr a )
{
ac_helperc_ACCESS2 ( a, /*isWrite*/True );
}
VGA_REGPARM(1)
static void ach_LOAD1 ( Addr a )
{
ac_helperc_ACCESS1 ( a, /*isWrite*/False );
}
VGA_REGPARM(1)
static void ach_STORE1 ( Addr a )
{
ac_helperc_ACCESS1 ( a, /*isWrite*/True );
}
/*------------------------------------------------------------*/
/*--- Fallback functions to handle cases that the above ---*/
/*--- ac_helperc_ACCESS{1,2,4} can't manage. ---*/
/*------------------------------------------------------------*/
static void ac_ACCESS4_SLOWLY ( Addr a, Bool isWrite )
{
Bool a0ok, a1ok, a2ok, a3ok;
PROF_EVENT(76);
/* First establish independently the addressibility of the 4 bytes
involved. */
a0ok = get_abit(a+0) == VGM_BIT_VALID;
a1ok = get_abit(a+1) == VGM_BIT_VALID;
a2ok = get_abit(a+2) == VGM_BIT_VALID;
a3ok = get_abit(a+3) == VGM_BIT_VALID;
/* Now distinguish 3 cases */
/* Case 1: the address is completely valid, so:
- no addressing error
*/
if (a0ok && a1ok && a2ok && a3ok) {
return;
}
/* Case 2: the address is completely invalid.
- emit addressing error
*/
/* VG_(printf)("%p (%d %d %d %d)\n", a, a0ok, a1ok, a2ok, a3ok); */
if (!MAC_(clo_partial_loads_ok)
|| ((a & 3) != 0)
|| (!a0ok && !a1ok && !a2ok && !a3ok)) {
MAC_(record_address_error)( VG_(get_running_tid)(), a, 4, isWrite );
return;
}
/* Case 3: the address is partially valid.
- no addressing error
Case 3 is only allowed if MAC_(clo_partial_loads_ok) is True
(which is the default), and the address is 4-aligned.
If not, Case 2 will have applied.
*/
tl_assert(MAC_(clo_partial_loads_ok));
{
return;
}
}
static void ac_ACCESS2_SLOWLY ( Addr a, Bool isWrite )
{
/* Check the address for validity. */
Bool aerr = False;
PROF_EVENT(77);
if (get_abit(a+0) != VGM_BIT_VALID) aerr = True;
if (get_abit(a+1) != VGM_BIT_VALID) aerr = True;
/* If an address error has happened, report it. */
if (aerr) {
MAC_(record_address_error)( VG_(get_running_tid)(), a, 2, isWrite );
}
}
static void ac_ACCESS1_SLOWLY ( Addr a, Bool isWrite)
{
/* Check the address for validity. */
Bool aerr = False;
PROF_EVENT(78);
if (get_abit(a+0) != VGM_BIT_VALID) aerr = True;
/* If an address error has happened, report it. */
if (aerr) {
MAC_(record_address_error)( VG_(get_running_tid)(), a, 1, isWrite );
}
}
/* ---------------------------------------------------------------------
FPU load and store checks, called from generated code.
------------------------------------------------------------------ */
static
void ac_fpu_ACCESS_check ( Addr addr, SizeT size, Bool isWrite )
{
/* Ensure the read area is both addressible and valid (ie,
readable). If there's an address error, don't report a value
error too; but if there isn't an address error, check for a
value error.
Try to be reasonably fast on the common case; wimp out and defer
to ac_fpu_ACCESS_check_SLOWLY for everything else. */
AcSecMap* sm;
UInt sm_off, a_off;
Addr addr4;
PROF_EVENT(90);
# ifdef VG_DEBUG_MEMORY
ac_fpu_ACCESS_check_SLOWLY ( addr, size, isWrite );
# else
if (size == 4) {
if (!VG_IS_4_ALIGNED(addr)) goto slow4;
PROF_EVENT(91);
/* Properly aligned. */
sm = primary_map[PM_IDX(addr)];
sm_off = SM_OFF(addr);
a_off = sm_off >> 3;
if (sm->abits[a_off] != VGM_BYTE_VALID) goto slow4;
/* Properly aligned and addressible. */
return;
slow4:
ac_fpu_ACCESS_check_SLOWLY ( addr, 4, isWrite );
return;
}
if (size == 8) {
if (!VG_IS_4_ALIGNED(addr)) goto slow8;
PROF_EVENT(92);
/* Properly aligned. Do it in two halves. */
addr4 = addr + 4;
/* First half. */
sm = primary_map[PM_IDX(addr)];
sm_off = SM_OFF(addr);
a_off = sm_off >> 3;
if (sm->abits[a_off] != VGM_BYTE_VALID) goto slow8;
/* First half properly aligned and addressible. */
/* Second half. */
sm = primary_map[PM_IDX(addr4)];
sm_off = SM_OFF(addr4);
a_off = sm_off >> 3;
if (sm->abits[a_off] != VGM_BYTE_VALID) goto slow8;
/* Second half properly aligned and addressible. */
/* Both halves properly aligned and addressible. */
return;
slow8:
ac_fpu_ACCESS_check_SLOWLY ( addr, 8, isWrite );
return;
}
/* Can't be bothered to huff'n'puff to make these (allegedly) rare
cases go quickly. */
if (size == 2) {
PROF_EVENT(93);
ac_fpu_ACCESS_check_SLOWLY ( addr, 2, isWrite );
return;
}
if (size == 16 || size == 10 || size == 28 || size == 108 || size == 512) {
PROF_EVENT(94);
ac_fpu_ACCESS_check_SLOWLY ( addr, size, isWrite );
return;
}
VG_(printf)("size is %d\n", size);
VG_(tool_panic)("fpu_ACCESS_check: unhandled size");
# endif
}
VGA_REGPARM(2)
static void ach_LOADN ( Addr addr, SizeT size )
{
ac_fpu_ACCESS_check ( addr, size, /*isWrite*/False );
}
VGA_REGPARM(2)
static void ach_STOREN ( Addr addr, SizeT size )
{
ac_fpu_ACCESS_check ( addr, size, /*isWrite*/True );
}
/* ---------------------------------------------------------------------
Slow, general cases for FPU access checks.
------------------------------------------------------------------ */
void ac_fpu_ACCESS_check_SLOWLY ( Addr addr, SizeT size, Bool isWrite )
{
Int i;
Bool aerr = False;
PROF_EVENT(100);
for (i = 0; i < size; i++) {
PROF_EVENT(101);
if (get_abit(addr+i) != VGM_BIT_VALID)
aerr = True;
}
if (aerr) {
MAC_(record_address_error)( VG_(get_running_tid)(), addr, size, isWrite );
}
}
/*------------------------------------------------------------*/
/*--- Our instrumenter ---*/
/*------------------------------------------------------------*/
IRBB* TL_(instrument)(IRBB* bb_in, VexGuestLayout* layout,
IRType gWordTy, IRType hWordTy )
{
Int i, hsz;
IRStmt* st;
IRExpr* data;
IRExpr* aexpr;
IRExpr* guard;
IRDirty* di;
Bool isLoad;
IRBB* bb;
if (gWordTy != hWordTy) {
/* We don't currently support this case. */
VG_(tool_panic)("host/guest word size mismatch");
}
/* Set up BB */
bb = emptyIRBB();
bb->tyenv = dopyIRTypeEnv(bb_in->tyenv);
bb->next = dopyIRExpr(bb_in->next);
bb->jumpkind = bb_in->jumpkind;
/* No loads to consider in ->next. */
tl_assert(isIRAtom(bb_in->next));
for (i = 0; i < bb_in->stmts_used; i++) {
st = bb_in->stmts[i];
tl_assert(st);
/* Examine each stmt in turn to figure out if it needs to be
preceded by a memory access check. If so, collect up the
relevant pieces of information. */
hsz = 0;
aexpr = NULL;
guard = NULL;
isLoad = True;
switch (st->tag) {
case Ist_Tmp:
data = st->Ist.Tmp.data;
if (data->tag == Iex_LDle) {
aexpr = data->Iex.LDle.addr;
hsz = sizeofIRType(data->Iex.LDle.ty);
isLoad = True;
}
break;
case Ist_STle:
data = st->Ist.STle.data;
aexpr = st->Ist.STle.addr;
tl_assert(isIRAtom(data));
tl_assert(isIRAtom(aexpr));
hsz = sizeofIRType(typeOfIRExpr(bb_in->tyenv, data));
isLoad = False;
break;
case Ist_Put:
tl_assert(isIRAtom(st->Ist.Put.data));
break;
case Ist_PutI:
tl_assert(isIRAtom(st->Ist.PutI.ix));
tl_assert(isIRAtom(st->Ist.PutI.data));
break;
case Ist_Exit:
tl_assert(isIRAtom(st->Ist.Exit.guard));
break;
case Ist_Dirty:
if (st->Ist.Dirty.details->mFx != Ifx_None) {
/* We classify Ifx_Modify as a load. */
isLoad = st->Ist.Dirty.details->mFx != Ifx_Write;
hsz = st->Ist.Dirty.details->mSize;
aexpr = st->Ist.Dirty.details->mAddr;
guard = st->Ist.Dirty.details->guard;
tl_assert(isIRAtom(aexpr));
}
break;
case Ist_NoOp:
case Ist_IMark:
case Ist_MFence:
break;
default:
VG_(printf)("\n");
ppIRStmt(st);
VG_(printf)("\n");
VG_(tool_panic)("addrcheck: unhandled IRStmt");
}
/* If needed, add a helper call. */
if (aexpr) {
tl_assert(hsz > 0);
switch (hsz) {
case 4:
if (isLoad)
di = unsafeIRDirty_0_N( 1, "ach_LOAD4", &ach_LOAD4,
mkIRExprVec_1(aexpr));
else
di = unsafeIRDirty_0_N( 1, "ach_STORE4", &ach_STORE4,
mkIRExprVec_1(aexpr));
break;
case 2:
if (isLoad)
di = unsafeIRDirty_0_N( 1, "ach_LOAD2", &ach_LOAD2,
mkIRExprVec_1(aexpr));
else
di = unsafeIRDirty_0_N( 1, "ach_STORE2", &ach_STORE2,
mkIRExprVec_1(aexpr));
break;
case 1:
if (isLoad)
di = unsafeIRDirty_0_N( 1, "ach_LOAD1", &ach_LOAD1,
mkIRExprVec_1(aexpr));
else
di = unsafeIRDirty_0_N( 1, "ach_STORE1", &ach_STORE1,
mkIRExprVec_1(aexpr));
break;
default:
if (isLoad)
di = unsafeIRDirty_0_N(
2, "ach_LOADN", &ach_LOADN,
mkIRExprVec_2(aexpr,mkIRExpr_HWord(hsz)));
else
di = unsafeIRDirty_0_N(
2, "ach_STOREN", &ach_STOREN,
mkIRExprVec_2(aexpr,mkIRExpr_HWord(hsz)));
break;
}
/* If the call has arisen as a result of a dirty helper which
references memory, we need to inherit the guard from the
dirty helper. */
if (guard)
di->guard = dopyIRExpr(guard);
/* emit the helper call */
addStmtToIRBB( bb, IRStmt_Dirty(di) );
}
/* And finally, copy the expr itself to the output. */
addStmtToIRBB( bb, st );
}
return bb;
}
/*------------------------------------------------------------*/
/*--- Detecting leaked (unreachable) malloc'd blocks. ---*/
/*------------------------------------------------------------*/
/* For the memory leak detector, say whether an entire 64k chunk of
address space is possibly in use, or not. If in doubt return
True.
*/
static
Bool ac_is_valid_64k_chunk ( UInt chunk_number )
{
tl_assert(chunk_number >= 0 && chunk_number < PRIMARY_SIZE);
if (primary_map[chunk_number] == DSM_NOTADDR) {
/* Definitely not in use. */
return False;
} else {
return True;
}
}
/* For the memory leak detector, say whether or not a given word
address is to be regarded as valid. */
static
Bool ac_is_valid_address ( Addr a )
{
UChar abits;
tl_assert(VG_IS_4_ALIGNED(a));
abits = get_abits4_ALIGNED(a);
if (abits == VGM_NIBBLE_VALID) {
return True;
} else {
return False;
}
}
/* Leak detector for this tool. We don't actually do anything, merely
run the generic leak detector with suitable parameters for this
tool. */
static void ac_detect_memory_leaks ( ThreadId tid, LeakCheckMode mode )
{
MAC_(do_detect_memory_leaks) ( tid, mode, ac_is_valid_64k_chunk, ac_is_valid_address );
}
/* ---------------------------------------------------------------------
Sanity check machinery (permanently engaged).
------------------------------------------------------------------ */
Bool TL_(cheap_sanity_check) ( void )
{
/* nothing useful we can rapidly check */
return True;
}
Bool TL_(expensive_sanity_check) ( void )
{
Int i;
#if 0
/* Make sure nobody changed the distinguished secondary. */
for (i = 0; i < 8192; i++)
if (distinguished_secondary_map.abits[i] != VGM_BYTE_INVALID)
return False;
#endif
/* Make sure that the upper 3/4 of the primary map hasn't
been messed with. */
for (i = PRIMARY_SIZE; i < PRIMARY_SIZE*4; i++)
if (primary_map[i] != DSM_NOTADDR)
return False;
return True;
}
/*------------------------------------------------------------*/
/*--- Client requests ---*/
/*------------------------------------------------------------*/
Bool TL_(handle_client_request) ( ThreadId tid, UWord* arg, UWord *ret )
{
#define IGNORE(what) \
do { \
if (moans-- > 0) { \
VG_(message)(Vg_UserMsg, \
"Warning: Addrcheck: ignoring `%s' request.", what); \
VG_(message)(Vg_UserMsg, \
" To honour this request, rerun with --tool=memcheck."); \
} \
} while (0)
static Int moans = 3;
/* Overload memcheck client reqs */
if (!VG_IS_TOOL_USERREQ('M','C',arg[0])
&& VG_USERREQ__MALLOCLIKE_BLOCK != arg[0]
&& VG_USERREQ__FREELIKE_BLOCK != arg[0]
&& VG_USERREQ__CREATE_MEMPOOL != arg[0]
&& VG_USERREQ__DESTROY_MEMPOOL != arg[0]
&& VG_USERREQ__MEMPOOL_ALLOC != arg[0]
&& VG_USERREQ__MEMPOOL_FREE != arg[0])
return False;
switch (arg[0]) {
case VG_USERREQ__DO_LEAK_CHECK:
ac_detect_memory_leaks(tid, arg[1] ? LC_Summary : LC_Full);
*ret = 0; /* return value is meaningless */
break;
/* Ignore these */
case VG_USERREQ__CHECK_WRITABLE: /* check writable */
IGNORE("VALGRIND_CHECK_WRITABLE");
return False;
case VG_USERREQ__CHECK_READABLE: /* check readable */
IGNORE("VALGRIND_CHECK_READABLE");
return False;
case VG_USERREQ__MAKE_NOACCESS: /* make no access */
IGNORE("VALGRIND_MAKE_NOACCESS");
return False;
case VG_USERREQ__MAKE_WRITABLE: /* make writable */
IGNORE("VALGRIND_MAKE_WRITABLE");
return False;
case VG_USERREQ__MAKE_READABLE: /* make readable */
IGNORE("VALGRIND_MAKE_READABLE");
return False;
case VG_USERREQ__DISCARD: /* discard */
IGNORE("VALGRIND_CHECK_DISCARD");
return False;
default:
if (MAC_(handle_common_client_requests)(tid, arg, ret )) {
return True;
} else {
VG_(message)(Vg_UserMsg,
"Warning: unknown addrcheck client request code %llx",
(ULong)arg[0]);
return False;
}
}
return True;
#undef IGNORE
}
/*------------------------------------------------------------*/
/*--- Setup ---*/
/*------------------------------------------------------------*/
Bool TL_(process_cmd_line_option)(Char* arg)
{
return MAC_(process_common_cmd_line_option)(arg);
}
void TL_(print_usage)(void)
{
MAC_(print_common_usage)();
}
void TL_(print_debug_usage)(void)
{
MAC_(print_common_debug_usage)();
}
/*------------------------------------------------------------*/
/*--- Setup ---*/
/*------------------------------------------------------------*/
void TL_(pre_clo_init)(void)
{
VG_(details_name) ("Addrcheck");
VG_(details_version) (NULL);
VG_(details_description) ("a fine-grained address checker");
VG_(details_copyright_author)(
"Copyright (C) 2002-2005, and GNU GPL'd, by Julian Seward et al.");
VG_(details_bug_reports_to) (VG_BUGS_TO);
VG_(details_avg_translation_sizeB) ( 135 );
VG_(basic_tool_funcs) (TL_(post_clo_init),
TL_(instrument),
TL_(fini));
VG_(needs_core_errors) ();
VG_(needs_tool_errors) (TL_(eq_Error),
TL_(pp_Error),
TL_(update_extra),
TL_(recognised_suppression),
TL_(read_extra_suppression_info),
TL_(error_matches_suppression),
TL_(get_error_name),
TL_(print_extra_suppression_info));
VG_(needs_libc_freeres) ();
VG_(needs_command_line_options)(TL_(process_cmd_line_option),
TL_(print_usage),
TL_(print_debug_usage));
VG_(needs_client_requests) (TL_(handle_client_request));
VG_(needs_sanity_checks) (TL_(cheap_sanity_check),
TL_(expensive_sanity_check));
VG_(needs_shadow_memory) ();
VG_(malloc_funcs) (TL_(malloc),
TL_(__builtin_new),
TL_(__builtin_vec_new),
TL_(memalign),
TL_(calloc),
TL_(free),
TL_(__builtin_delete),
TL_(__builtin_vec_delete),
TL_(realloc),
MALLOC_REDZONE_SZB );
MAC_( new_mem_heap) = & ac_new_mem_heap;
MAC_( ban_mem_heap) = & ac_make_noaccess;
MAC_(copy_mem_heap) = & ac_copy_address_range_state;
MAC_( die_mem_heap) = & ac_make_noaccess;
MAC_(check_noaccess) = & ac_check_noaccess;
VG_(init_new_mem_startup) ( & ac_new_mem_startup );
VG_(init_new_mem_stack_signal) ( & ac_make_accessible );
VG_(init_new_mem_brk) ( & ac_make_accessible );
VG_(init_new_mem_mmap) ( & ac_new_mem_mmap );
VG_(init_copy_mem_remap) ( & ac_copy_address_range_state );
VG_(init_die_mem_stack_signal) ( & ac_make_noaccess );
VG_(init_die_mem_brk) ( & ac_make_noaccess );
VG_(init_die_mem_munmap) ( & ac_make_noaccess );
VG_(init_new_mem_stack_4) ( & MAC_(new_mem_stack_4) );
VG_(init_new_mem_stack_8) ( & MAC_(new_mem_stack_8) );
VG_(init_new_mem_stack_12) ( & MAC_(new_mem_stack_12) );
VG_(init_new_mem_stack_16) ( & MAC_(new_mem_stack_16) );
VG_(init_new_mem_stack_32) ( & MAC_(new_mem_stack_32) );
VG_(init_new_mem_stack) ( & MAC_(new_mem_stack) );
VG_(init_die_mem_stack_4) ( & MAC_(die_mem_stack_4) );
VG_(init_die_mem_stack_8) ( & MAC_(die_mem_stack_8) );
VG_(init_die_mem_stack_12) ( & MAC_(die_mem_stack_12) );
VG_(init_die_mem_stack_16) ( & MAC_(die_mem_stack_16) );
VG_(init_die_mem_stack_32) ( & MAC_(die_mem_stack_32) );
VG_(init_die_mem_stack) ( & MAC_(die_mem_stack) );
VG_(init_ban_mem_stack) ( & ac_make_noaccess );
VG_(init_pre_mem_read) ( & ac_check_is_readable );
VG_(init_pre_mem_read_asciiz) ( & ac_check_is_readable_asciiz );
VG_(init_pre_mem_write) ( & ac_check_is_writable );
VG_(init_post_mem_write) ( & ac_post_mem_write );
VG_(register_profile_event) ( VgpSetMem, "set-mem-perms" );
VG_(register_profile_event) ( VgpCheckMem, "check-mem-perms" );
VG_(register_profile_event) ( VgpESPAdj, "adjust-ESP" );
init_shadow_memory();
MAC_(common_pre_clo_init)();
}
void TL_(post_clo_init) ( void )
{
}
void TL_(fini) ( Int exitcode )
{
MAC_(common_fini)( ac_detect_memory_leaks );
}
VG_DETERMINE_INTERFACE_VERSION(TL_(pre_clo_init), 1./8)
/*--------------------------------------------------------------------*/
/*--- end ac_main.c ---*/
/*--------------------------------------------------------------------*/
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