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ftmemsim-valgrind/coregrind/vg_transtab.c
Jeremy Fitzhardinge 918c3a7b7e This jumbo-checkin is the Full Virtualization checkin. This eliminates 
Valgrind's dependency on the dynamic linker for getting started, and
instead takes things into its own hands.

This checkin doesn't add much in the way of new functionality, but it
is the basis for all future work on Valgrind.  It allows us much more
flexibility in implementation, and well as increasing the reliability
of Valgrind by protecting it more from its clients.

This patch requires some changes to tools to update them to the changes
in the tool API, but they are straightforward.  See the posting "Heads
up: Full Virtualization" on valgrind-developers for a more complete
description of this change and its effects on you.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@2118
2003-12-16 02:05:15 +00:00

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/*--------------------------------------------------------------------*/
/*--- Management of the translation table and cache. ---*/
/*--- vg_transtab.c ---*/
/*--------------------------------------------------------------------*/
/*
This file is part of Valgrind, an extensible x86 protected-mode
emulator for monitoring program execution on x86-Unixes.
Copyright (C) 2000-2003 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 "vg_include.h"
#include <stddef.h>
/* #define DEBUG_TRANSTAB */
/*-------------------------------------------------------------*/
/*--- Management of the FIFO-based translation table+cache. ---*/
/*-------------------------------------------------------------*/
/*------------------ CONSTANTS ------------------*/
/* Number of sectors the TC is divided into. */
#define VG_TC_N_SECTORS 8
/* Calculated once at startup and never changed. */
static /* const */ Int vg_tc_sector_szB = 0;
/* Number of entries in the translation table. This must be a prime
number in order to make the hashing work properly. */
#define VG_TT_SIZE /*5281*/ /*100129*/ /*200191*/ /*250829*/ 300007
/* Do an LRU pass when the translation table becomes this full. */
#define VG_TT_LIMIT_PERCENT /*67*/ 80
#define VG_TT_LIMIT ((VG_TT_SIZE * VG_TT_LIMIT_PERCENT) / 100)
/*------------------ TYPES ------------------*/
#define CODE_ALIGNMENT 4 /* alignment of TCEntries */
#define CODE_ALIGN(a) (((a)+CODE_ALIGNMENT-1) & ~(CODE_ALIGNMENT-1))
#define IS_ALIGNED(a) (((a) & (CODE_ALIGNMENT-1)) == 0)
/* An entry in TC. Payload always is always padded out to a 4-aligned
quantity so that these structs are always word-aligned. */
typedef
struct {
/* +0 */ Addr orig_addr;
/* +4 */ UShort orig_size;
/* +6 */ UShort trans_size;
/* +8 */ UShort jump_sites[VG_MAX_JUMPS];
/* +VG_CODE_OFFSET */ UChar payload[0];
}
TCEntry;
/* An entry in TT. */
typedef
struct {
Addr orig_addr;
TCEntry* tcentry;
}
TTEntry;
/* Denotes an empty TT slot, when TTEntry.orig_addr holds this
value. */
#define VG_TTE_EMPTY ((Addr)1)
/* Denotes an empty TT slot, when TTEntry.orig_addr holds this
value. */
#define VG_TTE_DELETED ((Addr)3)
/* A bogus TCEntry which hopefully does not match code from any valid
address. This is what all VG_(tt_fast) entries are made to point
at when we want to invalidate it. */
static const TCEntry vg_tc_bogus_TCEntry = { ((Addr)5), 0, 0 };
/*------------------ DECLS ------------------*/
/* The translation cache sectors. These are NULL until allocated
dynamically. */
static UChar* vg_tc[VG_TC_N_SECTORS];
/* Count of bytes used in each sector of the TC. */
static Int vg_tc_used[VG_TC_N_SECTORS];
/* The age of each sector, so we can find the oldest. We just use the
global count of translations made when the sector was brought into
use. Doesn't matter if this mechanism gets confused (wraps around
4G) once in a while. */
static Int vg_tc_age[VG_TC_N_SECTORS];
/* The number of the sector currently being allocated in. */
static Int vg_tc_current;
/* Count of number of translations, orig and new bytes in each sector.
For stats purposes only. */
static Int vg_tc_stats_count[VG_TC_N_SECTORS];
static Int vg_tc_stats_osize[VG_TC_N_SECTORS];
static Int vg_tc_stats_tsize[VG_TC_N_SECTORS];
/*------------------ TRANSLATION TABLE ------------------*/
/* The translation table. An array of VG_TT_SIZE TTEntrys. */
static TTEntry* vg_tt = NULL;
/* Count of non-empty TT entries. This includes deleted ones. */
static Int vg_tt_used = 0;
/* Fast helper for the TT. A direct-mapped cache which holds a
pointer to a TT entry which may or may not be the correct one, but
which we hope usually is. This array is referred to directly from
vg_dispatch.S. */
Addr /* TCEntry*, really */ VG_(tt_fast)[VG_TT_FAST_SIZE];
static void for_each_tc(Int sector, void (*fn)(TCEntry *));
/*------------------ T-CHAINING HELPERS ------------------*/
static
void for_each_jumpsite(TCEntry *tce, void (*fn)(Addr))
{
Int i;
for(i = 0; i < VG_MAX_JUMPS; i++) {
Addr a;
UShort idx = tce->jump_sites[i];
if (idx == (UShort)-1)
continue;
a = (Addr)&tce->payload[idx];
(*fn)(a);
}
}
static inline
void unchain_tce(TCEntry *tce)
{
for_each_jumpsite(tce, VG_(unchain_jumpsite));
}
/* Unchain any jumps pointing to a sector we're about to free */
static
void unchain_sector(Int s, Addr base, UInt len)
{
void unchain_site(Addr a) {
Addr jmp = VG_(get_jmp_dest)(a);
if (jmp >= base && jmp < (base+len))
VG_(unchain_jumpsite)(a);
}
void _unchain_tce(TCEntry *tce) {
for_each_jumpsite(tce, unchain_site);
}
for_each_tc(s, _unchain_tce);
}
/*------------------ TT HELPERS ------------------*/
static
void pp_tt_tc_status ( Char* submsg )
{
Int tc_used, s;
if (VG_(clo_verbosity) <= 2)
return;
tc_used = 0;
for (s = 0; s < VG_TC_N_SECTORS; s++)
tc_used += vg_tc_used[s];
VG_(message)(Vg_DebugMsg,
"%lluk bbs: tt %d, tc %d, %s",
VG_(bbs_done) / 1000,
vg_tt_used, tc_used, submsg );
}
/* Invalidate the tt_fast cache, for whatever reason, by pointing all
entries at vg_tc_bogus_TCEntry. */
static
void vg_invalidate_tt_fast( void )
{
Int j;
for (j = 0; j < VG_TT_FAST_SIZE; j++)
VG_(tt_fast)[j] = (Addr)&vg_tc_bogus_TCEntry;
}
static
void add_tt_entry ( TCEntry* tce )
{
UInt i;
/* VG_(printf)("add_TT_entry orig_addr %p\n", tce->orig_addr); */
/* Hash to get initial probe point. */
i = ((UInt)(tce->orig_addr)) % VG_TT_SIZE;
while (True) {
if (vg_tt[i].orig_addr == tce->orig_addr)
VG_(core_panic)("add_TT_entry: duplicate");
if (vg_tt[i].orig_addr == VG_TTE_EMPTY)
break;
i++;
if (i == VG_TT_SIZE)
i = 0;
}
vg_tt[i].orig_addr = tce->orig_addr;
vg_tt[i].tcentry = tce;
vg_tt_used++;
/* sanity ... */
vg_assert(vg_tt_used < VG_TT_SIZE-1000);
}
/* Search TT to find the translated address of the supplied original,
or NULL if not found. This routine is used when we miss in
VG_(tt_fast).
*/
static __inline__
TTEntry* search_tt ( Addr orig_addr )
{
Int i;
/* Hash to get initial probe point. */
i = ((UInt)orig_addr) % VG_TT_SIZE;
while (True) {
if (vg_tt[i].orig_addr == orig_addr)
return &vg_tt[i];
if (vg_tt[i].orig_addr == VG_TTE_EMPTY)
return NULL;
i++;
if (i == VG_TT_SIZE) i = 0;
}
}
static
void initialise_tt ( void )
{
Int i;
vg_tt_used = 0;
for (i = 0; i < VG_TT_SIZE; i++) {
vg_tt[i].orig_addr = VG_TTE_EMPTY;
}
vg_invalidate_tt_fast();
}
static
void rebuild_TT ( void )
{
Int s;
/* Throw away TT. */
initialise_tt();
/* Rebuild TT from the remaining quarters. */
for (s = 0; s < VG_TC_N_SECTORS; s++) {
for_each_tc(s, add_tt_entry);
}
pp_tt_tc_status ( "after rebuild of TC" );
}
/*------------------ TC HELPERS ------------------*/
static
void for_each_tc(Int s, void (*fn)(TCEntry *))
{
UChar *pc;
UChar *pc_lim;
TCEntry *tce;
pc = &(vg_tc[s][0]);
pc_lim = &(vg_tc[s][vg_tc_used[s]]);
while (True) {
if (pc >= pc_lim) break;
tce = (TCEntry*)pc;
pc += sizeof(TCEntry) + tce->trans_size;
if (tce->orig_addr != VG_TTE_DELETED)
(*fn)(tce);
}
}
/* Find the oldest non-NULL, non-empty sector, or -1 if none such. */
static
Int find_oldest_sector ( void )
{
Int oldest_age, oldest, i;
oldest_age = 1000 * 1000 * 1000;
oldest = -1;
for (i = 0; i < VG_TC_N_SECTORS; i++) {
if (vg_tc[i] == NULL)
continue;
if (vg_tc_used[i] == 0)
continue;
if (vg_tc_age[i] < oldest_age) {
oldest = i;
oldest_age = vg_tc_age[i];
}
}
return oldest;
}
/* Discard the oldest sector, if any such exists. */
static
void discard_oldest_sector ( void )
{
Char msg[100];
Int s = find_oldest_sector();
if (s != -1) {
Int i;
vg_assert(s >= 0 && s < VG_TC_N_SECTORS);
VG_(sprintf)(msg, "before discard of sector %d (%d bytes)",
s, vg_tc_used[s]);
for(i = 0; i < VG_TC_N_SECTORS; i++) {
if (i != s && vg_tc[i] != NULL)
unchain_sector(i, (Addr)vg_tc[s], vg_tc_used[s]);
}
pp_tt_tc_status ( msg );
VG_(overall_out_count) += vg_tc_stats_count[s];
VG_(overall_out_osize) += vg_tc_stats_osize[s];
VG_(overall_out_tsize) += vg_tc_stats_tsize[s];
vg_tc_used[s] = 0;
vg_tc_stats_count[s] = 0;
vg_tc_stats_osize[s] = 0;
vg_tc_stats_tsize[s] = 0;
VG_(number_of_tc_discards) ++;
}
}
/* Find an empty sector and bring it into use. If there isn't one,
try and allocate one. If that fails, return -1. */
static
Int maybe_commission_sector ( void )
{
Char msg[100];
Int s;
for (s = 0; s < VG_TC_N_SECTORS; s++) {
if (vg_tc[s] != NULL && vg_tc_used[s] == 0) {
vg_tc_age[s] = VG_(overall_in_count);
VG_(sprintf)(msg, "after commission of sector %d "
"at time %d",
s, vg_tc_age[s]);
pp_tt_tc_status ( msg );
# ifdef DEBUG_TRANSTAB
VG_(sanity_check_tc_tt)();
# endif
return s;
}
}
for (s = 0; s < VG_TC_N_SECTORS; s++) {
if (vg_tc[s] == NULL) {
#if 1
vg_tc[s] = VG_(get_memory_from_mmap)
( vg_tc_sector_szB, "trans-cache(sector)" );
#else
Char buf[20];
static Int count = 0;
Int fd;
VG_(sprintf)(buf, ".transtab.%d", count++);
fd = VG_(open)(buf, VKI_O_RDWR|VKI_O_CREAT|VKI_O_TRUNC, 0700);
//VG_(unlink)(buf);
VG_(do_syscall)(__NR_ftruncate, fd, PGROUNDUP(vg_tc_sector_szB));
vg_tc[s] = VG_(mmap)(0, PGROUNDUP(vg_tc_sector_szB), VKI_PROT_READ|VKI_PROT_WRITE|VKI_PROT_EXEC, VKI_MAP_SHARED, fd, 0);
VG_(close)(fd);
#endif
vg_tc_used[s] = 0;
VG_(sprintf)(msg, "after allocation of sector %d "
"(size %d)",
s, vg_tc_sector_szB );
pp_tt_tc_status ( msg );
return maybe_commission_sector();
}
}
return -1;
}
static
UChar* allocate ( Int nBytes )
{
Int i;
vg_assert(IS_ALIGNED(nBytes));
/* Ensure the TT is still OK. */
while (vg_tt_used >= VG_TT_LIMIT) {
(void)discard_oldest_sector();
rebuild_TT();
vg_assert(vg_tt_used < VG_TT_LIMIT);
}
/* Can we get it into the current sector? */
if (vg_tc_current >= 0
&& vg_tc_current < VG_TC_N_SECTORS
&& vg_tc[vg_tc_current] != NULL
&& vg_tc_used[vg_tc_current] + nBytes <= vg_tc_sector_szB) {
/* Yes. */
UChar* p = &(vg_tc[vg_tc_current][ vg_tc_used[vg_tc_current] ]);
vg_tc_used[vg_tc_current] += nBytes;
return p;
}
/* Perhaps we can bring a new sector into use, for the first
time. */
vg_tc_current = maybe_commission_sector();
if (vg_tc_current >= 0 && vg_tc_current < VG_TC_N_SECTORS)
return allocate(nBytes);
/* That didn't work. We'll have to dump the oldest. We take the
opportunity to dump the N oldest at once. */
for (i = 0; i < 1; i++)
(void)discard_oldest_sector();
rebuild_TT();
vg_tc_current = maybe_commission_sector();
vg_assert(vg_tc_current >= 0 && vg_tc_current < VG_TC_N_SECTORS);
# ifdef DEBUG_TRANSTAB
VG_(sanity_check_tc_tt)();
# endif
return allocate(nBytes);
}
/* Just so these counts can be queried without making them globally
visible. */
void VG_(get_tt_tc_used) ( UInt* tt_used, UInt* tc_used )
{
Int s;
*tt_used = vg_tt_used;
*tc_used = 0;
for (s = 0; s < VG_TC_N_SECTORS; s++)
*tc_used += vg_tc_used[s];
}
/* Do a sanity check on TT/TC.
*/
void VG_(sanity_check_tc_tt) ( void )
{
Int i, s;
TTEntry* tte;
TCEntry* tce;
/* Checks:
- Each TT entry points to a valid and corresponding TC entry.
*/
for (i = 0; i < VG_TT_SIZE; i++) {
tte = &vg_tt[i];
/* empty slots are harmless. */
if (tte->orig_addr == VG_TTE_EMPTY) continue;
/* all others should agree with the TC entry. */
tce = tte->tcentry;
vg_assert(IS_ALIGNED4_ADDR(tce));
/* does this point into a valid TC sector? */
for (s = 0; s < VG_TC_N_SECTORS; s++)
if (vg_tc[s] != NULL
&& ((Addr)tce) >= (Addr)&vg_tc[s][0]
&& ((Addr)tce) < (Addr)&vg_tc[s][ vg_tc_used[s] ])
break;
vg_assert(s < VG_TC_N_SECTORS);
/* It should agree with the TC entry on the orig_addr. This may
be VG_TTE_DELETED, or a real orig addr. */
vg_assert(tte->orig_addr == tce->orig_addr);
}
}
/* Add this already-filled-in entry to the TT. Assumes that the
relevant code chunk has been placed in TC, along with a dummy back
pointer, which is inserted here.
*/
void VG_(add_to_trans_tab) ( Addr orig_addr, Int orig_size,
Addr trans_addr, Int trans_size,
UShort jumps[VG_MAX_JUMPS])
{
Int i, nBytes, trans_size_aligned;
TCEntry* tce;
/*
VG_(printf)("add_to_trans_tab(%d) %x %d %x %d\n",
vg_tt_used, tte->orig_addr, tte->orig_size,
tte->trans_addr, tte->trans_size);
*/
vg_assert(offsetof(TCEntry, payload) == VG_CODE_OFFSET);
/* figure out how many bytes we require. */
nBytes = CODE_ALIGN(trans_size + sizeof(TCEntry));
trans_size_aligned = nBytes-sizeof(TCEntry);
vg_assert(IS_ALIGNED(nBytes));
tce = (TCEntry*)allocate(nBytes);
/*
VG_(printf)("allocate returned %p (code start %p)\n",
tce, &tce->payload[0]);
*/
vg_assert(vg_tc_current >= 0 && vg_tc_current < VG_TC_N_SECTORS);
tce->orig_addr = orig_addr;
tce->orig_size = (UShort)orig_size; /* what's the point of storing this? */
tce->trans_size = (UShort)trans_size_aligned;
for (i = 0; i < VG_MAX_JUMPS; i++) {
tce->jump_sites[i] = jumps[i];
}
for (i = 0; i < trans_size; i++) {
tce->payload[i] = ((UChar*)trans_addr)[i];
}
unchain_tce(tce);
add_tt_entry(tce);
/* Update stats. */
VG_(overall_in_count) ++;
VG_(overall_in_osize) += orig_size;
VG_(overall_in_tsize) += trans_size;
vg_tc_stats_count[vg_tc_current] ++;
vg_tc_stats_osize[vg_tc_current] += orig_size;
vg_tc_stats_tsize[vg_tc_current] += trans_size;
}
/* Find the translation address for a given (original) code address.
If found, update VG_(tt_fast) so subsequent lookups are fast. If
no translation can be found, return zero. This routine is (the
only one) called from vg_run_innerloop. */
Addr VG_(search_transtab) ( Addr original_addr )
{
TTEntry* tte;
VGP_PUSHCC(VgpSlowFindT);
tte = search_tt ( original_addr );
if (tte == NULL) {
/* We didn't find it. vg_run_innerloop will have to request a
translation. */
VGP_POPCC(VgpSlowFindT);
return (Addr)0;
} else {
/* Found it. Put the search result into the fast cache now. */
UInt cno = (UInt)original_addr & VG_TT_FAST_MASK;
VG_(tt_fast)[cno] = (Addr)(tte->tcentry);
VG_(tt_fast_misses)++;
VGP_POPCC(VgpSlowFindT);
return (Addr)&(tte->tcentry->payload[0]);
}
}
/* Invalidate translations of original code [start .. start + range - 1].
This is slow, so you *really* don't want to call it very often.
Set 'unchain_blocks' if the translation being invalidated may be chained
to by other local blocks (which are NOT being discarded).
*/
void VG_(invalidate_translations) ( Addr start, UInt range, Bool unchain_blocks )
{
Addr i_start, i_end, o_start, o_end;
UInt out_count, out_osize, out_tsize;
Int i, j;
TCEntry* tce;
# ifdef DEBUG_TRANSTAB
VG_(sanity_check_tc_tt)();
# endif
i_start = start;
i_end = start + range - 1;
out_count = out_osize = out_tsize = 0;
for (i = 0; i < VG_TT_SIZE; i++) {
if (vg_tt[i].orig_addr == VG_TTE_EMPTY
|| vg_tt[i].orig_addr == VG_TTE_DELETED) continue;
tce = vg_tt[i].tcentry;
o_start = tce->orig_addr;
o_end = o_start + tce->trans_size - 1;
if (o_end < i_start || o_start > i_end)
continue;
if (VG_(needs).basic_block_discards)
SK_(discard_basic_block_info)( tce->orig_addr,
tce->orig_size );
vg_tt[i].orig_addr = VG_TTE_DELETED;
tce->orig_addr = VG_TTE_DELETED;
if (unchain_blocks) {
/* make sure no other blocks chain to the one we just discarded */
for(j = 0; j < VG_TC_N_SECTORS; j++) {
if (vg_tc[j] != NULL)
unchain_sector(j, (Addr)tce->payload, tce->trans_size);
}
}
VG_(overall_out_count) ++;
VG_(overall_out_osize) += tce->orig_size;
VG_(overall_out_tsize) += tce->trans_size;
out_count ++;
out_osize += tce->orig_size;
out_tsize += tce->trans_size;
}
if (out_count > 0) {
vg_invalidate_tt_fast();
VG_(sanity_check_tc_tt)();
# ifdef DEBUG_TRANSTAB
{ Addr aa;
for (aa = i_start; aa <= i_end; aa++)
vg_assert(search_tt ( aa ) == NULL);
}
# endif
}
if (VG_(clo_verbosity) > 2)
VG_(message)(Vg_UserMsg,
"discard %d (%d -> %d) translations in range %p .. %p",
out_count, out_osize, out_tsize, i_start, i_end );
}
/*------------------------------------------------------------*/
/*--- Initialisation. ---*/
/*------------------------------------------------------------*/
void VG_(init_tt_tc) ( void )
{
Int s;
/* Otherwise we wind up with non-32-bit-aligned code in
TCEntries. */
vg_assert((VG_MAX_JUMPS % 2) == 0);
/* Figure out how big each sector should be. */
vg_tc_sector_szB
= (VG_TT_LIMIT /* max TT entries we expect */
* (VG_(details).avg_translation_sizeB
+ sizeof(TCEntry)
+ (CODE_ALIGNMENT/2) /* avg alignment loss */)
)
/ VG_TC_N_SECTORS;
/* Ensure the calculated value is not way crazy. */
vg_assert(vg_tc_sector_szB >= 200000);
vg_assert(vg_tc_sector_szB <= 8000000);
for (s = 0; s < VG_TC_N_SECTORS; s++) {
vg_tc[s] = NULL;
vg_tc_used[s] = 0;
vg_tc_age[s] = 0;
vg_tc_stats_count[s] = 0;
vg_tc_stats_osize[s] = 0;
vg_tc_stats_tsize[s] = 0;
}
vg_tc_current = 0;
vg_tt = VG_(get_memory_from_mmap) ( VG_TT_SIZE * sizeof(TTEntry),
"trans-table" );
/* The main translation table is empty. */
initialise_tt();
if (VG_(clo_verbosity) > 2) {
VG_(message)(Vg_DebugMsg,
"Translation Cache: using %d sectors of %d bytes each",
VG_TC_N_SECTORS, vg_tc_sector_szB );
VG_(message)(Vg_DebugMsg,
"Translation Table: %d total entries, max occupancy %d (%d%%)",
VG_TT_SIZE, VG_TT_LIMIT, VG_TT_LIMIT_PERCENT );
}
# ifdef DEBUG_TRANSTAB
VG_(sanity_check_tc_tt)();
# endif
}
/*--------------------------------------------------------------------*/
/*--- end vg_transtab.c ---*/
/*--------------------------------------------------------------------*/
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