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352b1d384c
* other platforms (e.g. amd64) are first trying to unwind with cfi info, then with the fp chain. * fp unwind when code is compiled without frame pointer can fail and give incomplete stack traces (often terminating with a random program counter, causing a huge amount of recorded stack traces). This patch improves unwinding on x86 by: * first time an IP is unwound, do the unwind both with CFI technique and with fp technique. If results are identical, IP is inserted in a cache of 'fp unwindable' IP * following unwind of the same IP are then done directly either with fp unwind or with cfi, depending on the cached result of the check done during first unwind. The cache is needed so as to avoid as much as possible cfi unwind, as this is significantly slower than fp unwind. git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13280
171 lines
6.7 KiB
C
171 lines
6.7 KiB
C
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/*--------------------------------------------------------------------*/
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/*--- Debug info. pub_core_debuginfo.h ---*/
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/*--------------------------------------------------------------------*/
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/*
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This file is part of Valgrind, a dynamic binary instrumentation
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framework.
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Copyright (C) 2000-2012 Julian Seward
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jseward@acm.org
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307, USA.
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The GNU General Public License is contained in the file COPYING.
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*/
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#ifndef __PUB_CORE_DEBUGINFO_H
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#define __PUB_CORE_DEBUGINFO_H
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//--------------------------------------------------------------------
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// PURPOSE: This module deals with reading debug info and symbol tables
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// to get file and function names, line numbers, variable types, and
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// to help stack unwinding.
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//--------------------------------------------------------------------
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#include "pub_tool_debuginfo.h"
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/* Initialise the entire module. Must be called first of all. */
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extern void VG_(di_initialise) ( void );
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/* LINUX: Notify the debuginfo system about a new mapping, or the
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disappearance of such, or a permissions change on an existing
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mapping. This is the way new debug information gets loaded. If
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allow_SkFileV is True, it will try load debug info if the mapping
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at 'a' belongs to Valgrind; whereas normally (False) it will not do
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that. This allows us to carefully control when the thing will read
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symbols from the Valgrind executable itself.
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If a call to VG_(di_notify_mmap) causes debug info to be read, then
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the returned ULong is an abstract handle which can later be used to
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refer to the debuginfo read as a result of this specific mapping,
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in later queries to m_debuginfo. In this case the handle value
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will be one or above. If the returned value is zero, no debug info
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was read.
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For VG_(di_notify_mmap), if use_fd is not -1, that is used instead
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of the filename; this avoids perturbing fcntl locks, which are
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released by simply re-opening and closing the same file (even via
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different fd!).
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*/
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#if defined(VGO_linux) || defined(VGO_darwin)
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extern ULong VG_(di_notify_mmap)( Addr a, Bool allow_SkFileV, Int use_fd );
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extern void VG_(di_notify_munmap)( Addr a, SizeT len );
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extern void VG_(di_notify_mprotect)( Addr a, SizeT len, UInt prot );
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/* this should really return ULong, as per VG_(di_notify_mmap). */
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extern void VG_(di_notify_pdb_debuginfo)( Int fd, Addr avma,
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SizeT total_size,
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PtrdiffT bias );
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/* this should also really return ULong */
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extern void VG_(di_notify_vm_protect)( Addr a, SizeT len, UInt prot );
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#endif
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extern void VG_(di_discard_ALL_debuginfo)( void );
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/* Like VG_(get_fnname), but it does not do C++ demangling nor Z-demangling
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* nor below-main renaming.
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* It should not be used for any names that will be shown to users.
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* It should only be used in cases where the names of interest will have
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* particular (ie. non-mangled) forms, or the mangled form is acceptable. */
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extern
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Bool VG_(get_fnname_raw) ( Addr a, HChar* buf, Int nbuf );
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/* Like VG_(get_fnname), but without C++ demangling. (But it does
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* Z-demangling and below-main renaming.) */
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extern
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Bool VG_(get_fnname_no_cxx_demangle) ( Addr a, HChar* buf, Int nbuf );
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/* mips-linux only: find the offset of current address. This is needed for
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stack unwinding for MIPS.
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*/
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extern
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Bool VG_(get_inst_offset_in_function)( Addr a, /*OUT*/PtrdiffT* offset );
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/* Use DWARF2/3 CFA information to do one step of stack unwinding.
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D3UnwindRegs holds the current register values, and is
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arch-specific. Note that the x86 and amd64 definitions are shared
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and so the regs are named 'xip' etc rather than 'eip' and 'rip'. */
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#if defined(VGA_amd64) || defined(VGA_x86)
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typedef
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struct { Addr xip; Addr xsp; Addr xbp; }
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D3UnwindRegs;
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#elif defined(VGA_arm)
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typedef
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struct { Addr r15; Addr r14; Addr r13; Addr r12; Addr r11; Addr r7; }
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D3UnwindRegs;
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#elif defined(VGA_ppc32) || defined(VGA_ppc64)
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typedef
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UChar /* should be void, but gcc complains at use points */
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D3UnwindRegs;
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#elif defined(VGA_s390x)
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typedef
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struct { Addr ia; Addr sp; Addr fp; Addr lr;}
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D3UnwindRegs;
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#elif defined(VGA_mips32)
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typedef
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struct { Addr pc; Addr sp; Addr fp; Addr ra; }
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D3UnwindRegs;
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#else
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# error "Unsupported arch"
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#endif
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extern Bool VG_(use_CF_info) ( /*MOD*/D3UnwindRegs* uregs,
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Addr min_accessible,
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Addr max_accessible );
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/* returns the "generation" of the CF info.
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Each time some debuginfo is changed (e.g. loaded or unloaded),
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the VG_(CF_info_generation) value returned will be increased.
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This can be used to flush cached information derived from the CF info. */
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extern UInt VG_(CF_info_generation) (void);
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/* Use MSVC FPO data to do one step of stack unwinding. */
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extern Bool VG_(use_FPO_info) ( /*MOD*/Addr* ipP,
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/*MOD*/Addr* spP,
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/*MOD*/Addr* fpP,
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Addr min_accessible,
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Addr max_accessible );
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/* ppc64-linux only: find the TOC pointer (R2 value) that should be in
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force at the entry point address of the function containing
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guest_code_addr. Returns 0 if not known. */
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extern Addr VG_(get_tocptr) ( Addr guest_code_addr );
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/* Map a function name to its entry point and toc pointer. Is done by
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sequential search of all symbol tables, so is very slow. To
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mitigate the worst performance effects, you may specify a soname
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pattern, and only objects matching that pattern are searched.
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Therefore specify "*" to search all the objects. On TOC-afflicted
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platforms, a symbol is deemed to be found only if it has a nonzero
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TOC pointer. */
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extern
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Bool VG_(lookup_symbol_SLOW)(const HChar* sopatt, HChar* name, Addr* pEnt,
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Addr* pToc);
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#endif // __PUB_CORE_DEBUGINFO_H
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/*--------------------------------------------------------------------*/
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/*--- end ---*/
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/*--------------------------------------------------------------------*/
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