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ftmemsim-valgrind/coregrind/m_addrinfo.c
Philippe Waroquiers 3159bc49c8 Improve description of an address that is on a stack but below sp. 
An address below the sp will be described as being on a stack, but below sp.

The stack for such an address is found in the registered stacks.

Also, if there is a guard page at the end of the stack (lowest address)
an address in this page will be described as being in thread guard page.
A guard page is recognised as being a page not readable/writable/executable.



git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14399
2014-08-31 22:27:19 +00:00

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/*--------------------------------------------------------------------*/
/*--- Obtaining information about an address. ---*/
/*--- m_addrinfo.c ---*/
/*--------------------------------------------------------------------*/
/*
This file is part of Valgrind, a dynamic binary instrumentation
framework.
Copyright (C) 2008-2013 OpenWorks Ltd
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.
*/
#include "pub_core_basics.h"
#include "pub_core_libcassert.h"
#include "pub_core_libcbase.h"
#include "pub_core_libcprint.h"
#include "pub_core_xarray.h"
#include "pub_core_debuginfo.h"
#include "pub_core_execontext.h"
#include "pub_core_addrinfo.h"
#include "pub_core_mallocfree.h"
#include "pub_core_machine.h"
#include "pub_core_options.h"
#include "pub_core_threadstate.h"
#include "pub_core_stacktrace.h"
#include "pub_core_stacks.h"
#include "pub_core_aspacemgr.h"
/* Returns the tid whose stack includes the address a.
If not found, returns VG_INVALID_THREADID. */
static ThreadId find_tid_with_stack_containing (Addr a)
{
ThreadId tid;
Addr start, end;
start = 0;
end = 0;
VG_(stack_limits)(a, &start, &end);
if (start == end) {
// No stack found
vg_assert (start == 0 && end == 0);
return VG_INVALID_THREADID;
}
/* Stack limits found. Search the tid to which this stack belongs. */
vg_assert (start <= a);
vg_assert (a <= end);
/* The stack end (highest accessible byte) is for sure inside the 'active'
part of the stack of the searched tid.
So, scan all 'active' stacks with VG_(thread_stack_reset_iter) ... */
{
Addr stack_min, stack_max;
VG_(thread_stack_reset_iter)(&tid);
while ( VG_(thread_stack_next)(&tid, &stack_min, &stack_max) ) {
if (stack_min <= end && end <= stack_max)
return tid;
}
}
/* We can arrive here if a stack was registered with wrong bounds
(e.g. end above the highest addressable byte)
and/or if the thread for the registered stack is dead, but
the stack was not unregistered. */
return VG_INVALID_THREADID;
}
void VG_(describe_addr) ( Addr a, /*OUT*/AddrInfo* ai )
{
VgSectKind sect;
/* -- Perhaps the variable type/location data describes it? -- */
ai->Addr.Variable.descr1
= VG_(newXA)( VG_(malloc), "mc.da.descr1",
VG_(free), sizeof(HChar) );
ai->Addr.Variable.descr2
= VG_(newXA)( VG_(malloc), "mc.da.descr2",
VG_(free), sizeof(HChar) );
(void) VG_(get_data_description)( ai->Addr.Variable.descr1,
ai->Addr.Variable.descr2, a );
/* If there's nothing in descr1/2, free them. Why is it safe to to
VG_(indexXA) at zero here? Because VG_(get_data_description)
guarantees to zero terminate descr1/2 regardless of the outcome
of the call. So there's always at least one element in each XA
after the call.
*/
if (0 == VG_(strlen)( VG_(indexXA)( ai->Addr.Variable.descr1, 0 ))) {
VG_(deleteXA)( ai->Addr.Variable.descr1 );
ai->Addr.Variable.descr1 = NULL;
}
if (0 == VG_(strlen)( VG_(indexXA)( ai->Addr.Variable.descr2, 0 ))) {
VG_(deleteXA)( ai->Addr.Variable.descr2 );
ai->Addr.Variable.descr2 = NULL;
}
/* Assume (assert) that VG_(get_data_description) fills in descr1
before it fills in descr2 */
if (ai->Addr.Variable.descr1 == NULL)
vg_assert(ai->Addr.Variable.descr2 == NULL);
/* So did we get lucky? */
if (ai->Addr.Variable.descr1 != NULL) {
ai->tag = Addr_Variable;
return;
}
/* -- Have a look at the low level data symbols - perhaps it's in
there. -- */
VG_(memset)( &ai->Addr.DataSym.name,
0, sizeof(ai->Addr.DataSym.name));
if (VG_(get_datasym_and_offset)(
a, &ai->Addr.DataSym.name[0],
sizeof(ai->Addr.DataSym.name)-1,
&ai->Addr.DataSym.offset )) {
ai->tag = Addr_DataSym;
vg_assert( ai->Addr.DataSym.name
[ sizeof(ai->Addr.DataSym.name)-1 ] == 0);
return;
}
/* -- Perhaps it's on a thread's stack? -- */
{
ThreadId tid;
Addr stack_min, stack_max;
VG_(thread_stack_reset_iter)(&tid);
while ( VG_(thread_stack_next)(&tid, &stack_min, &stack_max) ) {
if (stack_min - VG_STACK_REDZONE_SZB <= a && a <= stack_max) {
Addr ips[VG_(clo_backtrace_size)],
sps[VG_(clo_backtrace_size)];
UInt n_frames;
UInt f;
ai->tag = Addr_Stack;
VG_(initThreadInfo)(&ai->Addr.Stack.tinfo);
ai->Addr.Stack.tinfo.tid = tid;
ai->Addr.Stack.IP = 0;
ai->Addr.Stack.frameNo = -1;
ai->Addr.Stack.stackPos = StackPos_stacked;
ai->Addr.Stack.spoffset = 0; // Unused.
/* It is on thread tid stack. Build a stacktrace, and
find the frame sp[f] .. sp[f+1] where the address is.
Store the found frameNo and the corresponding IP in
the description.
When description is printed, IP will be translated to
the function name containing IP.
Before accepting to describe addr with sp[f] .. sp[f+1],
we verify the sp looks sane: reasonably sized frame,
inside the stack.
We could check the ABI required alignment for sp (what is it?)
is respected, except for the innermost stack pointer ? */
n_frames = VG_(get_StackTrace)( tid, ips, VG_(clo_backtrace_size),
sps, NULL, 0/*first_ip_delta*/ );
for (f = 0; f < n_frames-1; f++) {
if (sps[f] <= a && a < sps[f+1]
&& sps[f+1] - sps[f] <= 0x4000000 // 64 MB, arbitrary
&& sps[f+1] <= stack_max
&& sps[f] >= stack_min - VG_STACK_REDZONE_SZB) {
ai->Addr.Stack.frameNo = f;
ai->Addr.Stack.IP = ips[f];
break;
}
}
return;
}
}
}
/* -- Maybe it is in one of the m_mallocfree.c arenas. -- */
{
AddrArenaInfo aai;
VG_(describe_arena_addr) ( a, &aai );
if (aai.name != NULL) {
ai->tag = Addr_Block;
if (aai.aid == VG_AR_CLIENT)
ai->Addr.Block.block_kind
= aai.free ? Block_ClientArenaFree : Block_ClientArenaMallocd;
else
ai->Addr.Block.block_kind
= aai.free
? Block_ValgrindArenaFree : Block_ValgrindArenaMallocd;
ai->Addr.Block.block_desc = aai.name;
ai->Addr.Block.block_szB = aai.block_szB;
ai->Addr.Block.rwoffset = aai.rwoffset;
ai->Addr.Block.allocated_at = VG_(null_ExeContext)();
VG_(initThreadInfo) (&ai->Addr.Block.alloc_tinfo);
ai->Addr.Block.freed_at = VG_(null_ExeContext)();
return;
}
}
/* -- last ditch attempt at classification -- */
vg_assert( sizeof(ai->Addr.SectKind.objname) > 4 );
VG_(memset)( &ai->Addr.SectKind.objname,
0, sizeof(ai->Addr.SectKind.objname));
VG_(strcpy)( ai->Addr.SectKind.objname, "???" );
sect = VG_(DebugInfo_sect_kind)( &ai->Addr.SectKind.objname[0],
sizeof(ai->Addr.SectKind.objname)-1, a);
if (sect != Vg_SectUnknown) {
ai->tag = Addr_SectKind;
ai->Addr.SectKind.kind = sect;
vg_assert( ai->Addr.SectKind.objname
[ sizeof(ai->Addr.SectKind.objname)-1 ] == 0);
return;
}
/* -- and yet another last ditch attempt at classification -- */
/* If the address is in a stack between the stack bottom (highest byte)
and the current stack ptr, it will have been already described above.
But maybe it is in a stack, but below the stack ptr (typical
for a 'use after return' or in the stack guard page (thread stack
too small). */
{
ThreadId tid;
StackPos stackPos;
// First try to find a tid with stack containing a
tid = find_tid_with_stack_containing (a);
if (tid != VG_INVALID_THREADID) {
/* Should be below stack pointer, as if it is >= SP, it
will have been described as StackPos_stacked above. */
stackPos = StackPos_below_stack_ptr;
} else {
/* Try to find a stack with guard page containing a.
For this, check if a is in a page mapped without r, w and x. */
const NSegment *seg = VG_(am_find_nsegment) (a);
if (seg != NULL && seg->kind == SkAnonC
&& !seg->hasR && !seg->hasW && !seg->hasX) {
/* This looks a plausible guard page. Check if a is close to
the start of stack (lowest byte). */
tid = find_tid_with_stack_containing (VG_PGROUNDUP(a+1));
if (tid != VG_INVALID_THREADID)
stackPos = StackPos_guard_page;
}
}
if (tid != VG_INVALID_THREADID) {
ai->tag = Addr_Stack;
VG_(initThreadInfo)(&ai->Addr.Stack.tinfo);
ai->Addr.Stack.tinfo.tid = tid;
ai->Addr.Stack.IP = 0;
ai->Addr.Stack.frameNo = -1;
ai->Addr.Stack.stackPos = stackPos;
vg_assert (a < VG_(get_SP)(tid));
ai->Addr.Stack.spoffset = a - VG_(get_SP)(tid);
return;
}
}
/* -- Clueless ... -- */
ai->tag = Addr_Unknown;
return;
}
void VG_(initThreadInfo) (ThreadInfo *tinfo)
{
tinfo->tid = 0;
tinfo->tnr = 0;
}
void VG_(clear_addrinfo) ( AddrInfo* ai)
{
switch (ai->tag) {
case Addr_Unknown:
break;
case Addr_Stack:
break;
case Addr_Block:
break;
case Addr_DataSym:
break;
case Addr_Variable:
if (ai->Addr.Variable.descr1 != NULL) {
VG_(deleteXA)( ai->Addr.Variable.descr1 );
ai->Addr.Variable.descr1 = NULL;
}
if (ai->Addr.Variable.descr2 != NULL) {
VG_(deleteXA)( ai->Addr.Variable.descr2 );
ai->Addr.Variable.descr2 = NULL;
}
break;
case Addr_SectKind:
break;
default:
VG_(core_panic)("VG_(clear_addrinfo)");
}
ai->tag = Addr_Undescribed;
}
static Bool is_arena_BlockKind(BlockKind bk)
{
switch (bk) {
case Block_Mallocd:
case Block_Freed:
case Block_MempoolChunk:
case Block_UserG: return False;
case Block_ClientArenaMallocd:
case Block_ClientArenaFree:
case Block_ValgrindArenaMallocd:
case Block_ValgrindArenaFree: return True;
default: vg_assert (0);
}
}
static const HChar* opt_tnr_prefix (ThreadInfo tinfo)
{
if (tinfo.tnr != 0)
return "#";
else
return "";
}
static UInt tnr_else_tid (ThreadInfo tinfo)
{
if (tinfo.tnr != 0)
return tinfo.tnr;
else
return tinfo.tid;
}
static void pp_addrinfo_WRK ( Addr a, AddrInfo* ai, Bool mc, Bool maybe_gcc )
{
const HChar* xpre = VG_(clo_xml) ? " <auxwhat>" : " ";
const HChar* xpost = VG_(clo_xml) ? "</auxwhat>" : "";
vg_assert (!maybe_gcc || mc); // maybe_gcc can only be given in mc mode.
switch (ai->tag) {
case Addr_Unknown:
if (maybe_gcc) {
VG_(emit)( "%sAddress 0x%llx is just below the stack ptr. "
"To suppress, use: --workaround-gcc296-bugs=yes%s\n",
xpre, (ULong)a, xpost );
} else {
VG_(emit)( "%sAddress 0x%llx "
"is not stack'd, malloc'd or %s%s\n",
xpre,
(ULong)a,
mc ? "(recently) free'd" : "on a free list",
xpost );
}
break;
case Addr_Stack:
VG_(emit)( "%sAddress 0x%llx is on thread %s%d's stack%s\n",
xpre, (ULong)a,
opt_tnr_prefix (ai->Addr.Stack.tinfo),
tnr_else_tid (ai->Addr.Stack.tinfo),
xpost );
if (ai->Addr.Stack.frameNo != -1 && ai->Addr.Stack.IP != 0) {
#define FLEN 256
HChar fn[FLEN];
Bool hasfn;
HChar file[FLEN];
Bool hasfile;
UInt linenum;
Bool haslinenum;
PtrdiffT offset;
hasfn = VG_(get_fnname)(ai->Addr.Stack.IP, fn, FLEN);
if (VG_(get_inst_offset_in_function)( ai->Addr.Stack.IP,
&offset))
haslinenum = VG_(get_linenum) (ai->Addr.Stack.IP - offset,
&linenum);
else
haslinenum = False;
hasfile = VG_(get_filename)(ai->Addr.Stack.IP, file, FLEN);
if (hasfile && haslinenum) {
HChar strlinenum[10];
VG_(snprintf) (strlinenum, 10, ":%d", linenum);
VG_(strncat) (file, strlinenum,
FLEN - VG_(strlen)(file) - 1);
}
if (hasfn || hasfile)
VG_(emit)( "%sin frame #%d, created by %s (%s)%s\n",
xpre,
ai->Addr.Stack.frameNo,
hasfn ? fn : "???",
hasfile ? file : "???",
xpost );
#undef FLEN
}
switch (ai->Addr.Stack.stackPos) {
case StackPos_stacked: break; // nothing more to say
case StackPos_below_stack_ptr:
case StackPos_guard_page:
VG_(emit)("%s%s%ld bytes below stack pointer%s\n",
xpre,
ai->Addr.Stack.stackPos == StackPos_guard_page ?
"In stack guard protected page, " : "",
- ai->Addr.Stack.spoffset,
xpost);
// Note: we change the sign of spoffset as the message speaks
// about the nr of bytes below stack pointer.
break;
default: vg_assert(0);
}
break;
case Addr_Block: {
SizeT block_szB = ai->Addr.Block.block_szB;
PtrdiffT rwoffset = ai->Addr.Block.rwoffset;
SizeT delta;
const HChar* relative;
if (rwoffset < 0) {
delta = (SizeT)(-rwoffset);
relative = "before";
} else if (rwoffset >= block_szB) {
delta = rwoffset - block_szB;
relative = "after";
} else {
delta = rwoffset;
relative = "inside";
}
if (is_arena_BlockKind (ai->Addr.Block.block_kind))
VG_(emit)(
"%sAddress 0x%lx is %'lu bytes %s a%s block of size %'lu"
" in arena \"%s\"%s\n",
xpre,
a, delta,
relative,
ai->Addr.Block.block_kind==Block_ClientArenaMallocd
|| ai->Addr.Block.block_kind==Block_ValgrindArenaMallocd
? "" : "n unallocated",
block_szB,
ai->Addr.Block.block_desc, // arena name
xpost
);
else
VG_(emit)(
"%sAddress 0x%lx is %'lu bytes %s a %s of size %'lu %s%s\n",
xpre,
a, delta,
relative,
ai->Addr.Block.block_desc,
block_szB,
ai->Addr.Block.block_kind==Block_Mallocd ? "alloc'd"
: ai->Addr.Block.block_kind==Block_Freed ? "free'd"
: "client-defined",
xpost
);
if (ai->Addr.Block.block_kind==Block_Mallocd) {
VG_(pp_ExeContext)(ai->Addr.Block.allocated_at);
tl_assert (ai->Addr.Block.freed_at == VG_(null_ExeContext)());
}
else if (ai->Addr.Block.block_kind==Block_Freed) {
VG_(pp_ExeContext)(ai->Addr.Block.freed_at);
if (ai->Addr.Block.allocated_at != VG_(null_ExeContext)()) {
VG_(emit)(
"%sBlock was alloc'd at%s\n",
xpre,
xpost
);
VG_(pp_ExeContext)(ai->Addr.Block.allocated_at);
}
}
else if (ai->Addr.Block.block_kind==Block_MempoolChunk
|| ai->Addr.Block.block_kind==Block_UserG) {
// client-defined
VG_(pp_ExeContext)(ai->Addr.Block.allocated_at);
tl_assert (ai->Addr.Block.freed_at == VG_(null_ExeContext)());
/* Nb: cannot have a freed_at, as a freed client-defined block
has a Block_Freed block_kind. */
} else {
// Client or Valgrind arena. At least currently, we never
// have stacktraces for these.
tl_assert (ai->Addr.Block.allocated_at == VG_(null_ExeContext)());
tl_assert (ai->Addr.Block.freed_at == VG_(null_ExeContext)());
}
if (ai->Addr.Block.alloc_tinfo.tnr || ai->Addr.Block.alloc_tinfo.tid)
VG_(emit)(
"%sBlock was alloc'd by thread %s%d%s\n",
xpre,
opt_tnr_prefix (ai->Addr.Block.alloc_tinfo),
tnr_else_tid (ai->Addr.Block.alloc_tinfo),
xpost
);
break;
}
case Addr_DataSym:
VG_(emit)( "%sAddress 0x%llx is %llu bytes "
"inside data symbol \"%pS\"%s\n",
xpre,
(ULong)a,
(ULong)ai->Addr.DataSym.offset,
ai->Addr.DataSym.name,
xpost );
break;
case Addr_Variable:
/* Note, no need for XML tags here, because descr1/2 will
already have <auxwhat> or <xauxwhat>s on them, in XML
mode. */
if (ai->Addr.Variable.descr1)
VG_(emit)( "%s%s\n",
VG_(clo_xml) ? " " : " ",
(HChar*)VG_(indexXA)(ai->Addr.Variable.descr1, 0) );
if (ai->Addr.Variable.descr2)
VG_(emit)( "%s%s\n",
VG_(clo_xml) ? " " : " ",
(HChar*)VG_(indexXA)(ai->Addr.Variable.descr2, 0) );
break;
case Addr_SectKind:
VG_(emit)( "%sAddress 0x%llx is in the %pS segment of %pS%s\n",
xpre,
(ULong)a,
VG_(pp_SectKind)(ai->Addr.SectKind.kind),
ai->Addr.SectKind.objname,
xpost );
if (ai->Addr.SectKind.kind == Vg_SectText) {
/* To better describe the address in a text segment,
pp a dummy stacktrace made of this single address. */
VG_(pp_StackTrace)( &a, 1 );
}
break;
default:
VG_(tool_panic)("mc_pp_AddrInfo");
}
}
void VG_(pp_addrinfo) ( Addr a, AddrInfo* ai )
{
pp_addrinfo_WRK (a, ai, False /*mc*/, False /*maybe_gcc*/);
}
void VG_(pp_addrinfo_mc) ( Addr a, AddrInfo* ai, Bool maybe_gcc )
{
pp_addrinfo_WRK (a, ai, True /*mc*/, maybe_gcc);
}
/*--------------------------------------------------------------------*/
/*--- end m_addrinfo.c ---*/
/*--------------------------------------------------------------------*/
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