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ftmemsim-valgrind/coregrind/pub_core_debuginfo.h
Mark Wielaard 8b4dd5c47c BZ#355188 valgrind should intercept all malloc related global functions. 
This implements the interception of all globally public allocation
functions by default. It works by adding a flag to the spec to say the
interception only applies to global functions. Which is set for the
somalloc spec. The librarypath to match is set to "*" unless the user
overrides it. Then each DiSym keeps track of whether the symbol is local
or global. For a spec which has isGlobal set only isGlobal symbols will
match.

Note that because of padding to keep the addresses in DiSym aligned the
addition of the extra bool isGlobal doesn't actually grow the struct.
The comments explain how the struct could be made more compact on 32bit
systems, but this isn't as easy on 64bit systems. So I didn't try to do
that in this patch.

For ELF symbols keeping track of which are global is trivial. For pdb I
had to guess and made only the "Public" symbols global. I don't know
how/if macho keeps track of global symbols or not. For now I just mark
all of them local (which just means things work as previously on platforms
that use machos, no non-system symbols are matches by default for somalloc
unless the user explicitly tells which library name to match).

Included are two testcases for shared libraries (wrapmalloc) and staticly
linked (wrapmallocstatic) malloc/free overrides that depend on the new
default. One existing testcase (new_override) was adjusted to explicitly
not use the new somalloc default because it depends on a user defined
new implementation that has side-effects and should explicitly not be
intercepted.

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@15726
2015-11-15 16:50:43 +00:00

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/*--------------------------------------------------------------------*/
/*--- Debug info. pub_core_debuginfo.h ---*/
/*--------------------------------------------------------------------*/
/*
This file is part of Valgrind, a dynamic binary instrumentation
framework.
Copyright (C) 2000-2015 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.
*/
#ifndef __PUB_CORE_DEBUGINFO_H
#define __PUB_CORE_DEBUGINFO_H
//--------------------------------------------------------------------
// PURPOSE: This module deals with reading debug info and symbol tables
// to get file and function names, line numbers, variable types, and
// to help stack unwinding.
//--------------------------------------------------------------------
#include "pub_tool_debuginfo.h"
/* Initialise the entire module. Must be called first of all. */
extern void VG_(di_initialise) ( void );
/* LINUX: Notify the debuginfo system about a new mapping, or the
disappearance of such, or a permissions change on an existing
mapping. This is the way new debug information gets loaded. If
allow_SkFileV is True, it will try load debug info if the mapping
at 'a' belongs to Valgrind; whereas normally (False) it will not do
that. This allows us to carefully control when the thing will read
symbols from the Valgrind executable itself.
If a call to VG_(di_notify_mmap) causes debug info to be read, then
the returned ULong is an abstract handle which can later be used to
refer to the debuginfo read as a result of this specific mapping,
in later queries to m_debuginfo. In this case the handle value
will be one or above. If the returned value is zero, no debug info
was read.
For VG_(di_notify_mmap), if use_fd is not -1, that is used instead
of the filename; this avoids perturbing fcntl locks, which are
released by simply re-opening and closing the same file (even via
different fd!).
*/
#if defined(VGO_linux) || defined(VGO_darwin) || defined(VGO_solaris)
extern ULong VG_(di_notify_mmap)( Addr a, Bool allow_SkFileV, Int use_fd );
extern void VG_(di_notify_munmap)( Addr a, SizeT len );
extern void VG_(di_notify_mprotect)( Addr a, SizeT len, UInt prot );
/* this should really return ULong, as per VG_(di_notify_mmap). */
extern void VG_(di_notify_pdb_debuginfo)( Int fd, Addr avma,
SizeT total_size,
PtrdiffT bias );
/* this should also really return ULong */
extern void VG_(di_notify_vm_protect)( Addr a, SizeT len, UInt prot );
#endif
extern void VG_(di_discard_ALL_debuginfo)( void );
/* Like VG_(get_fnname), but it does not do C++ demangling nor Z-demangling
* nor below-main renaming.
* It should not be used for any names that will be shown to users.
* It should only be used in cases where the names of interest will have
* particular (ie. non-mangled) forms, or the mangled form is acceptable. */
extern
Bool VG_(get_fnname_raw) ( Addr a, const HChar** buf );
/* Like VG_(get_fnname), but without C++ demangling. (But it does
Z-demangling and below-main renaming.)
iipc argument: same usage as in VG_(describe_IP) in pub_tool_debuginfo.h. */
extern
Bool VG_(get_fnname_no_cxx_demangle) ( Addr a, const HChar** buf,
const InlIPCursor* iipc );
/* mips-linux only: find the offset of current address. This is needed for
stack unwinding for MIPS.
*/
extern
Bool VG_(get_inst_offset_in_function)( Addr a, /*OUT*/PtrdiffT* offset );
/* Use DWARF2/3 CFA information to do one step of stack unwinding.
D3UnwindRegs holds the current register values, and is
arch-specific. Note that the x86 and amd64 definitions are shared
and so the regs are named 'xip' etc rather than 'eip' and 'rip'. */
#if defined(VGA_amd64) || defined(VGA_x86)
typedef
struct { Addr xip; Addr xsp; Addr xbp; }
D3UnwindRegs;
#elif defined(VGA_arm)
typedef
struct { Addr r15; Addr r14; Addr r13; Addr r12; Addr r11; Addr r7; }
D3UnwindRegs;
#elif defined(VGA_arm64)
typedef
struct { Addr pc; Addr sp; Addr x30; Addr x29; } /* PC, SP, LR, FP */
D3UnwindRegs;
#elif defined(VGA_ppc32) || defined(VGA_ppc64be) || defined(VGA_ppc64le)
typedef
UChar /* should be void, but gcc complains at use points */
D3UnwindRegs;
#elif defined(VGA_s390x)
typedef
struct { Addr ia; Addr sp; Addr fp; Addr lr;}
D3UnwindRegs;
#elif defined(VGA_mips32) || defined(VGA_mips64)
typedef
struct { Addr pc; Addr sp; Addr fp; Addr ra; }
D3UnwindRegs;
#elif defined(VGA_tilegx)
typedef
struct { Addr pc; Addr sp; Addr fp; Addr lr; }
D3UnwindRegs;
#else
# error "Unsupported arch"
#endif
extern Bool VG_(use_CF_info) ( /*MOD*/D3UnwindRegs* uregs,
Addr min_accessible,
Addr max_accessible );
/* returns the "generation" of the debug info.
Each time some debuginfo is changed (e.g. loaded or unloaded),
the VG_(debuginfo_generation)() value returned will be increased.
This can be used to flush cached information derived from debug
info (e.g. CFI info or FPO info or ...). */
extern UInt VG_(debuginfo_generation) (void);
/* True if some FPO information is loaded.
It is useless to call VG_(use_FPO_info) if this returns False.
Note that the return value should preferrably be cached in
the stack unwind code, and re-queried when the debug info generation
changes. */
extern Bool VG_(FPO_info_present)(void);
/* Use MSVC FPO data to do one step of stack unwinding. */
extern Bool VG_(use_FPO_info) ( /*MOD*/Addr* ipP,
/*MOD*/Addr* spP,
/*MOD*/Addr* fpP,
Addr min_accessible,
Addr max_accessible );
/* Print the unwind info (if there is some) for the given address
range [from,to]. */
extern void VG_(ppUnwindInfo) (Addr from, Addr to);
/* AVMAs for a symbol. Usually only the lowest address of the entity.
On ppc64 platforms, also contains tocptr and local_ep.
These fields should only be accessed using the macros
GET_TOCPTR_AVMA/SET_TOCPTR_AVMA/GET_LOCAL_EP_AVMA/SET_LOCAL_EP_AVMA. */
typedef
struct {
Addr main; /* lowest address of entity */
# if defined(VGA_ppc64be) || defined(VGA_ppc64le)
Addr tocptr; /* ppc64be/le-linux only: value that R2 should have */
# endif
# if defined(VGA_ppc64le)
Addr local_ep; /* address for local entry point, ppc64le only */
# endif
}
SymAVMAs;
#if defined(VGA_ppc64be) || defined(VGA_ppc64le)
# define GET_TOCPTR_AVMA(_sym_avmas) (_sym_avmas).tocptr
# define SET_TOCPTR_AVMA(_sym_avmas, _val) (_sym_avmas).tocptr = (_val)
#else
# define GET_TOCPTR_AVMA(_sym_avmas) ((Addr)0)
# define SET_TOCPTR_AVMA(_sym_avmas, _val) /* */
#endif
#if defined(VGA_ppc64le)
# define GET_LOCAL_EP_AVMA(_sym_avmas) (_sym_avmas).local_ep
# define SET_LOCAL_EP_AVMA(_sym_avmas, _val) (_sym_avmas).local_ep = (_val)
#else
# define GET_LOCAL_EP_AVMA(_sym_avmas) ((Addr)0)
# define SET_LOCAL_EP_AVMA(_sym_avmas, _val) /* */
#endif
/* Functions for traversing all the symbols in a DebugInfo. _howmany
tells how many symbol table entries there are. _getidx retrieves
the n'th entry, for n in 0 .. _howmany-1. You may not modify the
function names thereby acquired; if you want to do so, first strdup
them. The primary name is returned in *pri_name, and *sec_names is
set either to NULL or to a NULL terminated vector containing
pointers to the secondary names. */
Int VG_(DebugInfo_syms_howmany) ( const DebugInfo *di );
void VG_(DebugInfo_syms_getidx) ( const DebugInfo *di,
Int idx,
/*OUT*/SymAVMAs* ad,
/*OUT*/UInt* size,
/*OUT*/const HChar** pri_name,
/*OUT*/const HChar*** sec_names,
/*OUT*/Bool* isText,
/*OUT*/Bool* isIFunc,
/*OUT*/Bool* isGlobal );
/* ppc64-linux only: find the TOC pointer (R2 value) that should be in
force at the entry point address of the function containing
guest_code_addr. Returns 0 if not known. */
extern Addr VG_(get_tocptr) ( Addr guest_code_addr );
/* Map a function name to its SymAVMAs. Is done by
sequential search of all symbol tables, so is very slow. To
mitigate the worst performance effects, you may specify a soname
pattern, and only objects matching that pattern are searched.
Therefore specify "*" to search all the objects. On TOC-afflicted
platforms, a symbol is deemed to be found only if it has a nonzero
TOC pointer. */
extern
Bool VG_(lookup_symbol_SLOW)(const HChar* sopatt, const HChar* name,
SymAVMAs* avmas);
#endif // __PUB_CORE_DEBUGINFO_H
/*--------------------------------------------------------------------*/
/*--- end ---*/
/*--------------------------------------------------------------------*/
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