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tnt_main.c
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/*--------------------------------------------------------------------*/
/*--- Taintgrind: The taint analysis Valgrind tool. tnt_main.c ---*/
/*--------------------------------------------------------------------*/
/*
This file is part of Taintgrind, the taint analysis Valgrind tool.
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 "pub_tool_basics.h"
#include "pub_tool_tooliface.h"
#include "pub_tool_vki.h" // keeps libcproc.h happy, syscall nums
#include "pub_tool_aspacemgr.h" // VG_(am_shadow_alloc)
#include "pub_tool_debuginfo.h" // VG_(get_fnname_w_offset), VG_(get_fnname)
#include "pub_tool_hashtable.h" // For tnt_include.h, VgHashtable
#include "pub_tool_libcassert.h" // tl_assert
#include "pub_tool_libcbase.h" // VG_STREQN
#include "pub_tool_libcprint.h" // VG_(message)
#include "pub_tool_libcproc.h" // VG_(getenv)
#include "pub_tool_replacemalloc.h" // VG_(replacement_malloc_process_cmd_line_option)
#include "pub_tool_machine.h" // VG_(get_IP)
#include "pub_tool_mallocfree.h" // VG_(out_of_memory_NORETURN)
#include "pub_tool_options.h" // VG_STR/BHEX/BINT_CLO
#include "pub_tool_oset.h" // OSet operations
#include "pub_tool_threadstate.h" // VG_(get_running_tid)
#include "pub_tool_xarray.h" // VG_(*XA)
#include "pub_tool_stacktrace.h" // VG_(get_and_pp_StackTrace)
#include "pub_tool_libcfile.h" // VG_(readlink)
#include "pub_tool_addrinfo.h" // VG_(describe_addr)
#include "tnt_include.h"
#include "tnt_strings.h"
#include "tnt_structs.h"
#include "tnt_malloc_wrappers.h"
#include "tnt_summary_names.h"
#include "tnt_libc.h"
#include "tnt_syswrap.h"
#include "tnt_asm.h"
#include "tnt_mmap.h"
/*------------------------------------------------------------*/
/*--- Fast-case knobs ---*/
/*------------------------------------------------------------*/
// Comment these out to disable the fast cases (don't just set them to zero).
#define PERF_FAST_LOADV 1
#define PERF_FAST_STOREV 1
#define PERF_FAST_SARP 1
/*---------- Taintgrind DEBUG statements---------*/
//#define DBG_MEM
//#define DBG_LOAD
//#define DBG_STORE
//#define DBG_COPY_ADDR_RANGE_STATE
/* --------------- Basic configuration --------------- */
/* Only change this. N_PRIMARY_MAP *must* be a power of 2. */
#if VG_WORDSIZE == 4
/* cover the entire address space */
# define N_PRIMARY_BITS 16
#else
/* Just handle the first 32G fast and the rest via auxiliary
primaries. If you change this, Memcheck will assert at startup.
See the definition of UNALIGNED_OR_HIGH for extensive comments. */
# define N_PRIMARY_BITS 19
#endif
/* Do not change this. */
#define N_PRIMARY_MAP ( ((UWord)1) << N_PRIMARY_BITS) // 524288
/* Do not change this. */
#define MAX_PRIMARY_ADDRESS (Addr)((((Addr)65536) * N_PRIMARY_MAP)-1)
// Taintgrind: UNDEFINED -> TAINTED, DEFINED -> UNTAINTED,
// PARTDEFINED -> PARTUNTAINTED
// These represent eight bits of memory.
#define VA_BITS2_NOACCESS 0x0 // 00b
#define VA_BITS2_TAINTED 0x1 // 01b
#define VA_BITS2_UNTAINTED 0x2 // 10b
#define VA_BITS2_PARTUNTAINTED 0x3 // 11b
// These represent 16 bits of memory.
#define VA_BITS4_NOACCESS 0x0 // 00_00b
#define VA_BITS4_TAINTED 0x5 // 01_01b
#define VA_BITS4_UNTAINTED 0xa // 10_10b
// These represent 32 bits of memory.
#define VA_BITS8_NOACCESS 0x00 // 00_00_00_00b
#define VA_BITS8_TAINTED 0x55 // 01_01_01_01b
#define VA_BITS8_UNTAINTED 0xaa // 10_10_10_10b
// These represent 64 bits of memory.
#define VA_BITS16_NOACCESS 0x0000 // 00_00_00_00b x 2
#define VA_BITS16_TAINTED 0x5555 // 01_01_01_01b x 2
#define VA_BITS16_UNTAINTED 0xaaaa // 10_10_10_10b x 2
#define SM_CHUNKS 16384 // Laurent: do not change this as it must be 65536/4 to store the vabits2
#define SM_OFF(aaa) (((aaa) & 0xffff) >> 2)
#define SM_OFF_16(aaa) (((aaa) & 0xffff) >> 3)
// Paranoia: it's critical for performance that the requested inlining
// occurs. So try extra hard.
#define INLINE inline __attribute__((always_inline))
static INLINE Addr start_of_this_sm ( Addr a ) {
return (a & (~SM_MASK));
}
static INLINE Bool is_start_of_sm ( Addr a ) {
return (start_of_this_sm(a) == a);
}
typedef
struct {
UChar vabits8[SM_CHUNKS];
}
SecMap;
// 3 distinguished secondary maps, one for no-access, one for
// accessible but undefined, and one for accessible and defined.
// Distinguished secondaries may never be modified.
#define SM_DIST_NOACCESS 0
#define SM_DIST_TAINTED 1
#define SM_DIST_UNTAINTED 2
static SecMap sm_distinguished[3];
static INLINE Bool is_distinguished_sm ( SecMap* sm ) {
return sm >= &sm_distinguished[0] && sm <= &sm_distinguished[2];
}
// -Start- Forward declarations for Taintgrind
Int ctoi( HChar c );
Int ctoi_test( HChar c );
Int atoi( HChar *s );
Int get_and_check_reg( HChar *reg );
Int get_and_check_tvar( HChar *tmp );
void infer_client_binary_name(UInt pc);
// -End- Forward declarations for Taintgrind
static void update_SM_counts(SecMap* oldSM, SecMap* newSM); //285
#if _SECRETGRIND_
#define UNKNOWN_OBJ_FMT "@0x%lx_unknownvar"
#define UNKNOWN_OBJ_IN_EXE_FMT "obj_%s@0x%lx_unknownvar_%u_%u"
static SizeT TNT_(size_of_taint)(ULong taint);
static Bool TNT_(parse_data)(const char *in, const char *left, const char *right, char *out, SizeT len);
static void TNT_(display_names_of_mem_region)(Addr a, SizeT len, sn_addr_type_t type);
static void TNT_(show_main_summary)(void);
static void taint_summary(const char *name);
static void var_taint_status(char *desc, Addr a, SizeT len);
static void TNT_(format_varname)(char *varnamebuf, SizeT bufsize, char *loc, char *offset, char *varname, char *filename, char *lineno, char *funcname, char *basename);
static Bool TNT_(is_stack)(Addr a);
static Bool TNT_(is_global)(Addr a);
static SizeT TNT_(size_of_load)(IRType ty, SizeT n);
static void TNT_(format_mnemonics_and_id)(Inst_t *ins, char *out, SizeT olen);
typedef union {
// for store_tc, ie STORE tmp = c
struct {
ULong c;
UInt atmp;
UChar offset;
} tc;
// for store_ct, ie STORE c = tmp
struct {
ULong c;
UInt dtmp;
UChar offset;
} ct;
// for store_tt, ie STORE dtmp = atmp
struct {
UInt atmp;
UInt dtmp;
UChar offset;
} tt;
} _H64_prepare_st;
static _H64_prepare_st GH64_prepare_xx = {};
static void TNT_(h64_reset_prepare_struct)(_H64_prepare_st *st) {
VG_(memset)(st, 0, sizeof(_H64_prepare_st));
}
typedef union {
// for store_tc, ie STORE tmp = c
struct {
UInt c;
UInt atmp;
UChar offset;
} tc;
// for store_ct, ie STORE c = tmp
struct {
UInt c;
UInt dtmp;
UChar offset;
} ct;
// for store_tt, ie STORE dtmp = atmp
struct {
UInt atmp;
UInt dtmp;
UChar offset;
} tt;
} _H32_prepare_st;
static _H32_prepare_st GH32_prepare_xx = {};
static void TNT_(h32_reset_prepare_struct)(_H32_prepare_st *st) {
VG_(memset)(st, 0, sizeof(_H32_prepare_st));
}
#endif
/* dist_sm points to one of our three distinguished secondaries. Make
a copy of it so that we can write to it.
*/
static SecMap* copy_for_writing ( SecMap* dist_sm )
{
SecMap* new_sm;
tl_assert(dist_sm == &sm_distinguished[0]
|| dist_sm == &sm_distinguished[1]
|| dist_sm == &sm_distinguished[2]);
new_sm = VG_(am_shadow_alloc)(sizeof(SecMap));
if (new_sm == NULL)
VG_(out_of_memory_NORETURN)( "memcheck:allocate new SecMap",
sizeof(SecMap) );
VG_(memcpy)(new_sm, dist_sm, sizeof(SecMap));
update_SM_counts(dist_sm, new_sm);
return new_sm;
}
/* --------------- Stats --------------- */
static Int n_issued_SMs = 0;
static Int n_deissued_SMs = 0;
static Int n_noaccess_SMs = N_PRIMARY_MAP; // start with many noaccess DSMs
static Int n_undefined_SMs = 0;
static Int n_defined_SMs = 0;
static Int n_non_DSM_SMs = 0;
static Int max_noaccess_SMs = 0;
static Int max_undefined_SMs = 0;
static Int max_defined_SMs = 0;
static Int max_non_DSM_SMs = 0;
/* # searches initiated in auxmap_L1, and # base cmps required */
static ULong n_auxmap_L1_searches = 0;
static ULong n_auxmap_L1_cmps = 0;
/* # of searches that missed in auxmap_L1 and therefore had to
be handed to auxmap_L2. And the number of nodes inserted. */
static ULong n_auxmap_L2_searches = 0;
static ULong n_auxmap_L2_nodes = 0;
//static Int n_sanity_cheap = 0;
//static Int n_sanity_expensive = 0;
static Int n_secVBit_nodes = 0;
static Int max_secVBit_nodes = 0;
static void update_SM_counts(SecMap* oldSM, SecMap* newSM)
{
if (oldSM == &sm_distinguished[SM_DIST_NOACCESS ]) n_noaccess_SMs --;
else if (oldSM == &sm_distinguished[SM_DIST_TAINTED]) n_undefined_SMs--;
else if (oldSM == &sm_distinguished[SM_DIST_UNTAINTED ]) n_defined_SMs --;
else { n_non_DSM_SMs --;
n_deissued_SMs ++; }
if (newSM == &sm_distinguished[SM_DIST_NOACCESS ]) n_noaccess_SMs ++;
else if (newSM == &sm_distinguished[SM_DIST_TAINTED]) n_undefined_SMs++;
else if (newSM == &sm_distinguished[SM_DIST_UNTAINTED ]) n_defined_SMs ++;
else { n_non_DSM_SMs ++;
n_issued_SMs ++; }
if (n_noaccess_SMs > max_noaccess_SMs ) max_noaccess_SMs = n_noaccess_SMs;
if (n_undefined_SMs > max_undefined_SMs) max_undefined_SMs = n_undefined_SMs;
if (n_defined_SMs > max_defined_SMs ) max_defined_SMs = n_defined_SMs;
if (n_non_DSM_SMs > max_non_DSM_SMs ) max_non_DSM_SMs = n_non_DSM_SMs;
}
/* --------------- Primary maps --------------- */
/* The main primary map. This covers some initial part of the address
space, addresses 0 .. (N_PRIMARY_MAP << 16)-1. The rest of it is
handled using the auxiliary primary map.
*/
static SecMap* primary_map[N_PRIMARY_MAP];
/* An entry in the auxiliary primary map. base must be a 64k-aligned
value, and sm points at the relevant secondary map. As with the
main primary map, the secondary may be either a real secondary, or
one of the three distinguished secondaries. DO NOT CHANGE THIS
LAYOUT: the first word has to be the key for OSet fast lookups.
*/
typedef
struct {
Addr base;
SecMap* sm;
}
AuxMapEnt;
/* Tunable parameter: How big is the L1 queue? */
#define N_AUXMAP_L1 24
/* Tunable parameter: How far along the L1 queue to insert
entries resulting from L2 lookups? */
#define AUXMAP_L1_INSERT_IX 12
static struct {
Addr base;
AuxMapEnt* ent; // pointer to the matching auxmap_L2 node
}
auxmap_L1[N_AUXMAP_L1];
static OSet* auxmap_L2 = NULL;
static void init_auxmap_L1_L2 ( void )
{
Int i;
for (i = 0; i < N_AUXMAP_L1; i++) {
auxmap_L1[i].base = 0;
auxmap_L1[i].ent = NULL;
}
tl_assert(0 == offsetof(AuxMapEnt,base));
tl_assert(sizeof(Addr) == sizeof(void*));
auxmap_L2 = VG_(OSetGen_Create)( /*keyOff*/ offsetof(AuxMapEnt,base),
/*fastCmp*/ NULL,
VG_(malloc), "mc.iaLL.1", VG_(free) );
}
/* Check representation invariants; if OK return NULL; else a
descriptive bit of text. Also return the number of
non-distinguished secondary maps referred to from the auxiliary
primary maps. */
//static HChar* check_auxmap_L1_L2_sanity ( Word* n_secmaps_found )
//{
// Word i, j;
/* On a 32-bit platform, the L2 and L1 tables should
both remain empty forever.
On a 64-bit platform:
In the L2 table:
all .base & 0xFFFF == 0
all .base > MAX_PRIMARY_ADDRESS
In the L1 table:
all .base & 0xFFFF == 0
all (.base > MAX_PRIMARY_ADDRESS
.base & 0xFFFF == 0
and .ent points to an AuxMapEnt with the same .base)
or
(.base == 0 and .ent == NULL)
*/
// *n_secmaps_found = 0;
// if (sizeof(void*) == 4) {
/* 32-bit platform */
// if (VG_(OSetGen_Size)(auxmap_L2) != 0)
// return "32-bit: auxmap_L2 is non-empty";
// for (i = 0; i < N_AUXMAP_L1; i++)
// if (auxmap_L1[i].base != 0 || auxmap_L1[i].ent != NULL)
// return "32-bit: auxmap_L1 is non-empty";
// } else {
/* 64-bit platform */
// UWord elems_seen = 0;
// AuxMapEnt *elem, *res;
// AuxMapEnt key;
/* L2 table */
// VG_(OSetGen_ResetIter)(auxmap_L2);
// while ( (elem = VG_(OSetGen_Next)(auxmap_L2)) ) {
// elems_seen++;
// if (0 != (elem->base & (Addr)0xFFFF))
// return "64-bit: nonzero .base & 0xFFFF in auxmap_L2";
// if (elem->base <= MAX_PRIMARY_ADDRESS)
// return "64-bit: .base <= MAX_PRIMARY_ADDRESS in auxmap_L2";
// if (elem->sm == NULL)
// return "64-bit: .sm in _L2 is NULL";
// if (!is_distinguished_sm(elem->sm))
// (*n_secmaps_found)++;
// }
// if (elems_seen != n_auxmap_L2_nodes)
// return "64-bit: disagreement on number of elems in _L2";
/* Check L1-L2 correspondence */
/* for (i = 0; i < N_AUXMAP_L1; i++) {
if (auxmap_L1[i].base == 0 && auxmap_L1[i].ent == NULL)
continue;
if (0 != (auxmap_L1[i].base & (Addr)0xFFFF))
return "64-bit: nonzero .base & 0xFFFF in auxmap_L1";
if (auxmap_L1[i].base <= MAX_PRIMARY_ADDRESS)
return "64-bit: .base <= MAX_PRIMARY_ADDRESS in auxmap_L1";
if (auxmap_L1[i].ent == NULL)
return "64-bit: .ent is NULL in auxmap_L1";
if (auxmap_L1[i].ent->base != auxmap_L1[i].base)
return "64-bit: _L1 and _L2 bases are inconsistent";*/
/* Look it up in auxmap_L2. */
/* key.base = auxmap_L1[i].base;
key.sm = 0;
res = VG_(OSetGen_Lookup)(auxmap_L2, &key);
if (res == NULL)
return "64-bit: _L1 .base not found in _L2";
if (res != auxmap_L1[i].ent)
return "64-bit: _L1 .ent disagrees with _L2 entry";
}*/
/* Check L1 contains no duplicates */
/* for (i = 0; i < N_AUXMAP_L1; i++) {
if (auxmap_L1[i].base == 0)
continue;
for (j = i+1; j < N_AUXMAP_L1; j++) {
if (auxmap_L1[j].base == 0)
continue;
if (auxmap_L1[j].base == auxmap_L1[i].base)
return "64-bit: duplicate _L1 .base entries";
}
}
}
return NULL;*/ /* ok */
//}
static void insert_into_auxmap_L1_at ( Word rank, AuxMapEnt* ent )
{
Word i;
tl_assert(ent);
tl_assert(rank >= 0 && rank < N_AUXMAP_L1);
for (i = N_AUXMAP_L1-1; i > rank; i--)
auxmap_L1[i] = auxmap_L1[i-1];
auxmap_L1[rank].base = ent->base;
auxmap_L1[rank].ent = ent;
}
static INLINE AuxMapEnt* maybe_find_in_auxmap ( Addr a )
{
AuxMapEnt key;
AuxMapEnt* res;
Word i;
tl_assert(a > MAX_PRIMARY_ADDRESS);
a &= ~(Addr)0xFFFF;
/* First search the front-cache, which is a self-organising
list containing the most popular entries. */
if (LIKELY(auxmap_L1[0].base == a))
return auxmap_L1[0].ent;
if (LIKELY(auxmap_L1[1].base == a)) {
Addr t_base = auxmap_L1[0].base;
AuxMapEnt* t_ent = auxmap_L1[0].ent;
auxmap_L1[0].base = auxmap_L1[1].base;
auxmap_L1[0].ent = auxmap_L1[1].ent;
auxmap_L1[1].base = t_base;
auxmap_L1[1].ent = t_ent;
return auxmap_L1[0].ent;
}
n_auxmap_L1_searches++;
for (i = 0; i < N_AUXMAP_L1; i++) {
if (auxmap_L1[i].base == a) {
break;
}
}
tl_assert(i >= 0 && i <= N_AUXMAP_L1);
n_auxmap_L1_cmps += (ULong)(i+1);
if (i < N_AUXMAP_L1) {
if (i > 0) {
Addr t_base = auxmap_L1[i-1].base;
AuxMapEnt* t_ent = auxmap_L1[i-1].ent;
auxmap_L1[i-1].base = auxmap_L1[i-0].base;
auxmap_L1[i-1].ent = auxmap_L1[i-0].ent;
auxmap_L1[i-0].base = t_base;
auxmap_L1[i-0].ent = t_ent;
i--;
}
return auxmap_L1[i].ent;
}
n_auxmap_L2_searches++;
/* First see if we already have it. */
key.base = a;
key.sm = 0;
res = VG_(OSetGen_Lookup)(auxmap_L2, &key);
if (res)
insert_into_auxmap_L1_at( AUXMAP_L1_INSERT_IX, res );
return res;
}
static AuxMapEnt* find_or_alloc_in_auxmap ( Addr a )
{
AuxMapEnt *nyu, *res;
/* First see if we already have it. */
res = maybe_find_in_auxmap( a );
if (LIKELY(res))
return res;
/* Ok, there's no entry in the secondary map, so we'll have
to allocate one. */
a &= ~(Addr)0xFFFF;
nyu = (AuxMapEnt*) VG_(OSetGen_AllocNode)( auxmap_L2, sizeof(AuxMapEnt) );
tl_assert(nyu);
nyu->base = a;
#if _SECRETGRIND_
nyu->sm = &sm_distinguished[SM_DIST_UNTAINTED];
#else
nyu->sm = &sm_distinguished[SM_DIST_NOACCESS];
#endif
VG_(OSetGen_Insert)( auxmap_L2, nyu );
insert_into_auxmap_L1_at( AUXMAP_L1_INSERT_IX, nyu );
n_auxmap_L2_nodes++;
return nyu;
}
/* --------------- SecMap fundamentals --------------- */ //586
// In all these, 'low' means it's definitely in the main primary map,
// 'high' means it's definitely in the auxiliary table.
static INLINE SecMap** get_secmap_low_ptr ( Addr a )
{
UWord pm_off = a >> 16;
//# if VG_DEBUG_MEMORY >= 1
tl_assert(pm_off < N_PRIMARY_MAP);
//# endif
return &primary_map[ pm_off ];
}
static INLINE SecMap** get_secmap_high_ptr ( Addr a )
{
AuxMapEnt* am = find_or_alloc_in_auxmap(a);
return &am->sm;
}
static SecMap** get_secmap_ptr ( Addr a )
{
#if _SECRETGRIND_
//VG_(printf)("get_secmap_ptr: %lx, %lx\n", a, MAX_PRIMARY_ADDRESS);
//tl_assert (a <= MAX_PRIMARY_ADDRESS && "received memory access above MAX_PRIMARY_ADDRESS");
#endif
return ( a <= MAX_PRIMARY_ADDRESS
? get_secmap_low_ptr(a)
: get_secmap_high_ptr(a));
}
static INLINE SecMap* get_secmap_for_reading_low ( Addr a )
{
return *get_secmap_low_ptr(a);
}
static INLINE SecMap* get_secmap_for_reading_high ( Addr a )
{
return *get_secmap_high_ptr(a);
}
static INLINE SecMap* get_secmap_for_writing_low(Addr a)
{
SecMap** p = get_secmap_low_ptr(a);
if (UNLIKELY(is_distinguished_sm(*p)))
*p = copy_for_writing(*p);
return *p;
}
static INLINE SecMap* get_secmap_for_writing_high ( Addr a )
{
SecMap** p = get_secmap_high_ptr(a);
if (UNLIKELY(is_distinguished_sm(*p)))
*p = copy_for_writing(*p);
return *p;
}
/* Produce the secmap for 'a', either from the primary map or by
ensuring there is an entry for it in the aux primary map. The
secmap may be a distinguished one as the caller will only want to
be able to read it.
*/
static INLINE SecMap* get_secmap_for_reading ( Addr a )
{
return ( a <= MAX_PRIMARY_ADDRESS
? get_secmap_for_reading_low (a)
: get_secmap_for_reading_high(a) );
}
/* Produce the secmap for 'a', either from the primary map or by
ensuring there is an entry for it in the aux primary map. The
secmap may not be a distinguished one, since the caller will want
to be able to write it. If it is a distinguished secondary, make a
writable copy of it, install it, and return the copy instead. (COW
semantics).
*/
static SecMap* get_secmap_for_writing ( Addr a )
{
return ( a <= MAX_PRIMARY_ADDRESS
? get_secmap_for_writing_low (a)
: get_secmap_for_writing_high(a) );
}
/* If 'a' has a SecMap, produce it. Else produce NULL. But don't
allocate one if one doesn't already exist. This is used by the
leak checker.
*/
/*static SecMap* maybe_get_secmap_for ( Addr a )
{
if (a <= MAX_PRIMARY_ADDRESS) {
return get_secmap_for_reading_low(a);
} else {
AuxMapEnt* am = maybe_find_in_auxmap(a);
return am ? am->sm : NULL;
}
}*/
/* --------------- Fundamental functions --------------- */
static INLINE
void insert_vabits2_into_vabits8 ( Addr a, UChar vabits2, UChar* vabits8 ) //682
{
UInt shift = (a & 3) << 1; // shift by 0, 2, 4, or 6
*vabits8 &= ~(0x3 << shift); // mask out the two old bits
*vabits8 |= (vabits2 << shift); // mask in the two new bits
}
static INLINE
void insert_vabits4_into_vabits8 ( Addr a, UChar vabits4, UChar* vabits8 )
{
UInt shift;
tl_assert(VG_IS_2_ALIGNED(a)); // Must be 2-aligned
shift = (a & 2) << 1; // shift by 0 or 4
*vabits8 &= ~(0xf << shift); // mask out the four old bits
*vabits8 |= (vabits4 << shift); // mask in the four new bits
}
static INLINE
UChar extract_vabits2_from_vabits8 ( Addr a, UChar vabits8 )
{
UInt shift = (a & 3) << 1; // shift by 0, 2, 4, or 6
vabits8 >>= shift; // shift the two bits to the bottom
return 0x3 & vabits8; // mask out the rest
}
static INLINE
UChar extract_vabits4_from_vabits8 ( Addr a, UChar vabits8 )
{
UInt shift;
tl_assert(VG_IS_2_ALIGNED(a)); // Must be 2-aligned
shift = (a & 2) << 1; // shift by 0 or 4
vabits8 >>= shift; // shift the four bits to the bottom
return 0xf & vabits8; // mask out the rest
}
// Note that these four are only used in slow cases. The fast cases do
// clever things like combine the auxmap check (in
// get_secmap_{read,writ}able) with alignment checks.
// *** WARNING! ***
// Any time this function is called, if it is possible that vabits2
// is equal to VA_BITS2_PARTUNTAINTED, then the corresponding entry in the
// sec-V-bits table must also be set!
static INLINE
void set_vabits2 ( Addr a, UChar vabits2 )
{
SecMap* sm = get_secmap_for_writing(a); // Taintgrind: only handle 32-bits
UWord sm_off = SM_OFF(a);
#ifdef DBG_MEM
// Taintgrind
// if (vabits2 == VA_BITS2_TAINTED)
VG_(printf)("set_vabits2 a:0x%08lx vabits2:0x%x sm->vabit8[sm_off]:0x%08x\n",
a, vabits2, (Int)&(sm->vabits8[sm_off]));
#endif
insert_vabits2_into_vabits8( a, vabits2, &(sm->vabits8[sm_off]) );
}
// *** WARNING! ***
// Any time this function is called, if it is possible that any of the
// 4 2-bit fields in vabits8 are equal to VA_BITS2_PARTUNTAINTED, then the
// corresponding entry(s) in the sec-V-bits table must also be set!
static INLINE
UChar get_vabits8_for_aligned_word32 ( Addr a )
{
SecMap* sm = get_secmap_for_reading(a);
UWord sm_off = SM_OFF(a);
UChar vabits8 = sm->vabits8[sm_off];
return vabits8;
}
static INLINE
void set_vabits8_for_aligned_word32 ( Addr a, UChar vabits8 )
{
SecMap* sm = get_secmap_for_writing(a);
UWord sm_off = SM_OFF(a);
sm->vabits8[sm_off] = vabits8;
}
// Needed by TNT_(instrument)
//static INLINE
UChar get_vabits2 ( Addr a )
{
#if _SECRETGRIND_
// re-use existing function
UChar vabits8 = get_vabits8_for_aligned_word32(a);
#else
SecMap* sm = get_secmap_for_reading(a); // Taintgrind: only handle 32-bits
UWord sm_off = SM_OFF(a);
UChar vabits8 = sm->vabits8[sm_off];
#endif
#ifdef DBG_MEM
// Taintgrind
UChar result = extract_vabits2_from_vabits8(a, vabits8);
// if (vabits2 == VA_BITS2_TAINTED)
VG_(printf)("get_vabits2 a:0x%08lx vabits2:0x%x sm->vabit8[sm_off]:0x%08x\n",
a, result, (Int)&vabits8);
return result;
#endif
return extract_vabits2_from_vabits8(a, vabits8);
}
// Forward declarations
static UWord get_sec_vbits8(Addr a);
static void set_sec_vbits8(Addr a, UWord vbits8);
// Returns False if there was an addressability error.
// Taintgrind: skip addressability check
static INLINE
Bool set_vbits8 ( Addr a, UChar vbits8 )
{
Bool ok = True;
UChar vabits2 = get_vabits2(a);
//if ( VA_BITS2_NOACCESS != vabits2 ) {
// Addressable. Convert in-register format to in-memory format.
// Also remove any existing sec V bit entry for the byte if no
// longer necessary.
if ( V_BITS8_UNTAINTED == vbits8 ) { vabits2 = VA_BITS2_UNTAINTED; }
else if ( V_BITS8_TAINTED == vbits8 ) { vabits2 = VA_BITS2_TAINTED; }
else { vabits2 = VA_BITS2_PARTUNTAINTED;
set_sec_vbits8(a, vbits8); }
set_vabits2(a, vabits2);
//} else {
// // Unaddressable! Do nothing -- when writing to unaddressable
// // memory it acts as a black hole, and the V bits can never be seen
// // again. So we don't have to write them at all.
// ok = False;
//}
return ok;
}
// Returns False if there was an addressability error. In that case, we put
// all defined bits into vbits8.
static INLINE
Bool get_vbits8 ( Addr a, UChar* vbits8 )
{
Bool ok = True;
UChar vabits2 = get_vabits2(a);
// Convert the in-memory format to in-register format.
if ( VA_BITS2_UNTAINTED == vabits2 ) { *vbits8 = V_BITS8_UNTAINTED; }
else if ( VA_BITS2_TAINTED == vabits2 ) { *vbits8 = V_BITS8_TAINTED; }
else if ( VA_BITS2_NOACCESS == vabits2 ) {
*vbits8 = V_BITS8_UNTAINTED; // Make V bits defined!
ok = False;
} else {
tl_assert( VA_BITS2_PARTUNTAINTED == vabits2 );
*vbits8 = get_sec_vbits8(a);
}
return ok;
}
/* --------------- Secondary V bit table ------------ */
static OSet* secVBitTable;
// Stats
static ULong sec_vbits_new_nodes = 0;
static ULong sec_vbits_updates = 0;
// This must be a power of two; this is checked in tnt_pre_clo_init().
// The size chosen here is a trade-off: if the nodes are bigger (ie. cover
// a larger address range) they take more space but we can get multiple
// partially-defined bytes in one if they are close to each other, reducing
// the number of total nodes. In practice sometimes they are clustered (eg.
// perf/bz2 repeatedly writes then reads more than 20,000 in a contiguous
// row), but often not. So we choose something intermediate.
#define BYTES_PER_SEC_VBIT_NODE 16
// We make the table bigger if more than this many nodes survive a GC.
#define MAX_SURVIVOR_PROPORTION 0.5
// Each time we make the table bigger, we increase it by this much.
#define TABLE_GROWTH_FACTOR 2
// This defines "sufficiently stale" -- any node that hasn't been touched in
// this many GCs will be removed.
#define MAX_STALE_AGE 2
// We GC the table when it gets this many nodes in it, ie. it's effectively
// the table size. It can change.
static Int secVBitLimit = 1024;
// The number of GCs done, used to age sec-V-bit nodes for eviction.
// Because it's unsigned, wrapping doesn't matter -- the right answer will
// come out anyway.
static UInt GCs_done = 0;
typedef
struct {
Addr a;
UChar vbits8[BYTES_PER_SEC_VBIT_NODE];
UInt last_touched;
}
SecVBitNode;
static OSet* createSecVBitTable(void)
{
return VG_(OSetGen_Create)( offsetof(SecVBitNode, a),
NULL, // use fast comparisons
VG_(malloc), "mc.cSVT.1 (sec VBit table)",
VG_(free) );
}
static void gcSecVBitTable(void)
{
OSet* secVBitTable2;
SecVBitNode* n;
Int i, n_nodes = 0, n_survivors = 0;
GCs_done++;
// Create the new table.
secVBitTable2 = createSecVBitTable();
// Traverse the table, moving fresh nodes into the new table.
VG_(OSetGen_ResetIter)(secVBitTable);
while ( (n = VG_(OSetGen_Next)(secVBitTable)) ) {
Bool keep = False;
if ( (GCs_done - n->last_touched) <= MAX_STALE_AGE ) {
// Keep node if it's been touched recently enough (regardless of
// freshness/staleness).
keep = True;
} else {
// Keep node if any of its bytes are non-stale. Using
// get_vabits2() for the lookup is not very efficient, but I don't
// think it matters.
for (i = 0; i < BYTES_PER_SEC_VBIT_NODE; i++) { VG_(printf)( "gcSecVBitTable() -> get_vabits2\n" );
if (VA_BITS2_PARTUNTAINTED == get_vabits2(n->a + i)) {
keep = True; // Found a non-stale byte, so keep
break;
}
}
}
if ( keep ) {
// Insert a copy of the node into the new table.
SecVBitNode* n2 =
VG_(OSetGen_AllocNode)(secVBitTable2, sizeof(SecVBitNode));
*n2 = *n;
VG_(OSetGen_Insert)(secVBitTable2, n2);
}
}
// Get the before and after sizes.
n_nodes = VG_(OSetGen_Size)(secVBitTable);
n_survivors = VG_(OSetGen_Size)(secVBitTable2);
// Destroy the old table, and put the new one in its place.
VG_(OSetGen_Destroy)(secVBitTable);
secVBitTable = secVBitTable2;
if (VG_(clo_verbosity) > 1) {
HChar percbuf[6];
VG_(percentify)(n_survivors, n_nodes, 1, 6, percbuf);
VG_(message)(Vg_DebugMsg, "tnt_main.c: GC: %d nodes, %d survivors (%s)\n",
n_nodes, n_survivors, percbuf);
}
// Increase table size if necessary.
if (n_survivors > (secVBitLimit * MAX_SURVIVOR_PROPORTION)) {
secVBitLimit *= TABLE_GROWTH_FACTOR;
if (VG_(clo_verbosity) > 1)
VG_(message)(Vg_DebugMsg, "tnt_main.c: GC: increase table size to %d\n",
secVBitLimit);
}
}
static UWord get_sec_vbits8(Addr a)
{
Addr aAligned = VG_ROUNDDN(a, BYTES_PER_SEC_VBIT_NODE);
Int amod = a % BYTES_PER_SEC_VBIT_NODE;
SecVBitNode* n = VG_(OSetGen_Lookup)(secVBitTable, &aAligned);
UChar vbits8;
tl_assert2(n, "get_sec_vbits8: no node for address %p (%p)\n", aAligned, a);
// Shouldn't be fully defined or fully undefined -- those cases shouldn't
// make it to the secondary V bits table.
vbits8 = n->vbits8[amod];
tl_assert(V_BITS8_UNTAINTED != vbits8 && V_BITS8_TAINTED != vbits8);
return vbits8;
}
static void set_sec_vbits8(Addr a, UWord vbits8)
{
Addr aAligned = VG_ROUNDDN(a, BYTES_PER_SEC_VBIT_NODE);
Int i, amod = a % BYTES_PER_SEC_VBIT_NODE;
SecVBitNode* n = VG_(OSetGen_Lookup)(secVBitTable, &aAligned);
// Shouldn't be fully defined or fully undefined -- those cases shouldn't
// make it to the secondary V bits table.
tl_assert(V_BITS8_UNTAINTED != vbits8 && V_BITS8_TAINTED != vbits8);
if (n) {
n->vbits8[amod] = vbits8; // update
n->last_touched = GCs_done;
sec_vbits_updates++;
} else {
// New node: assign the specific byte, make the rest invalid (they
// should never be read as-is, but be cautious).
n = VG_(OSetGen_AllocNode)(secVBitTable, sizeof(SecVBitNode));
n->a = aAligned;
for (i = 0; i < BYTES_PER_SEC_VBIT_NODE; i++) {
n->vbits8[i] = V_BITS8_TAINTED;
}
n->vbits8[amod] = vbits8;
n->last_touched = GCs_done;
// Do a table GC if necessary. Nb: do this before inserting the new
// node, to avoid erroneously GC'ing the new node.
if (secVBitLimit == VG_(OSetGen_Size)(secVBitTable)) {
gcSecVBitTable();
}
// Insert the new node.
VG_(OSetGen_Insert)(secVBitTable, n);
sec_vbits_new_nodes++;
n_secVBit_nodes = VG_(OSetGen_Size)(secVBitTable);
if (n_secVBit_nodes > max_secVBit_nodes)
max_secVBit_nodes = n_secVBit_nodes;
}
}
/* --------------- Endianness helpers --------------- */
/* Returns the offset in memory of the byteno-th most significant byte
in a wordszB-sized word, given the specified endianness. */
static INLINE UWord byte_offset_w ( UWord wordszB, Bool bigendian,
UWord byteno ) {
return bigendian ? (wordszB-1-byteno) : byteno;
}
/* --------------- Load/store slow cases. --------------- */
static
__attribute__((noinline))
void tnt_LOADV_128_or_256_slow ( /*OUT*/ULong* res,
Addr a, SizeT nBits, Bool bigendian )
{
//ULong pessim[4]; /* only used when p-l-ok=yes */
SSizeT szB = nBits / 8;
SSizeT szL = szB / 8; /* Size in Longs (64-bit units) */
SSizeT i, j; /* Must be signed. */
SizeT n_addrs_bad = 0;
Addr ai;
UChar vbits8;
Bool ok;
/* Code below assumes load size is a power of two and at least 64