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https://github.com/Zenithsiz/ftmemsim-valgrind.git
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64a4375b1b
ip before starting a new pass of the loop. The reason for this is that (except for the first pass of the loop) the value of ip is actually a return address, which is therefore after the instruction that was executing at the time. This means that if there is a boundary in the CFI information at that point we can wind up using the wrong CFI data to do the next unwind if we do it based on the return address. This most commonly happens with a tail call where we wind up using the data for the next function to do the unwind and getting hopelessly lost. git-svn-id: svn://svn.valgrind.org/valgrind/trunk@4996
322 lines
9.8 KiB
C
322 lines
9.8 KiB
C
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/*--------------------------------------------------------------------*/
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/*--- Take snapshots of client stacks. m_stacktrace.c ---*/
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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) 2000-2005 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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#include "pub_core_basics.h"
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#include "pub_core_threadstate.h"
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#include "pub_core_debuginfo.h"
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#include "pub_core_aspacemgr.h" // For VG_(is_addressable)()
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#include "pub_core_libcbase.h"
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#include "pub_core_libcassert.h"
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#include "pub_core_libcprint.h"
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#include "pub_core_machine.h"
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#include "pub_core_options.h"
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#include "pub_core_profile.h"
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#include "pub_core_stacktrace.h"
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#include "pub_core_trampoline.h"
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/*------------------------------------------------------------*/
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/*--- Exported functions. ---*/
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/*------------------------------------------------------------*/
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/* Take a snapshot of the client's stack, putting the up to 'n_ips'
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IPs into 'ips'. In order to be thread-safe, we pass in the
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thread's IP SP, FP if that's meaningful, and LR if that's
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meaningful. Returns number of IPs put in 'ips'.
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*/
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UInt VG_(get_StackTrace2) ( Addr* ips, UInt n_ips,
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Addr ip, Addr sp, Addr fp, Addr lr,
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Addr fp_min, Addr fp_max_orig )
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{
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#if defined(VGP_ppc32_linux)
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Bool lr_is_first_RA = False; /* ppc only */
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#endif
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Bool debug = False;
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Int i;
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Addr fp_max;
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UInt n_found = 0;
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VGP_PUSHCC(VgpExeContext);
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vg_assert(sizeof(Addr) == sizeof(UWord));
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vg_assert(sizeof(Addr) == sizeof(void*));
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/* Snaffle IPs from the client's stack into ips[0 .. n_ips-1],
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putting zeroes in when the trail goes cold, which we guess to be
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when FP is not a reasonable stack location. */
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for (i = 0; i < n_ips; i++)
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ips[i] = 0;
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// JRS 2002-sep-17: hack, to round up fp_max to the end of the
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// current page, at least. Dunno if it helps.
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// NJN 2002-sep-17: seems to -- stack traces look like 1.0.X again
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fp_max = VG_PGROUNDUP(fp_max_orig);
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fp_max -= sizeof(Addr);
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if (debug)
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VG_(printf)("n_ips=%d fp_min=%p fp_max_orig=%p, fp_max=%p ip=%p fp=%p\n",
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n_ips, fp_min, fp_max_orig, fp_max, ip, fp);
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/* Assertion broken before main() is reached in pthreaded programs; the
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* offending stack traces only have one item. --njn, 2002-aug-16 */
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/* vg_assert(fp_min <= fp_max);*/
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if (fp_min + VG_(clo_max_stackframe) <= fp_max) {
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/* If the stack is ridiculously big, don't poke around ... but
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don't bomb out either. Needed to make John Regehr's
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user-space threads package work. JRS 20021001 */
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ips[0] = ip;
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VGP_POPCC(VgpExeContext);
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return 1;
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}
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/* Otherwise unwind the stack in a platform-specific way. Trying
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to merge the x86, amd64 and ppc32 logic into a single piece of
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code is just too confusing. */
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/*--------------------- x86 and amd64 ---------------------*/
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# if defined(VGP_x86_linux) || defined(VGP_amd64_linux)
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/* fp is %ebp/%rbp. sp is %esp/%rsp. ip is %eip/%rip. */
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ips[0] = ip;
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i = 1;
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while (True) {
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if (i >= n_ips)
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break;
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/* Try to derive a new (ip,sp,fp) triple from the current
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set. */
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/* First off, see if there is any CFI info to hand which can
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be used. */
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if ( VG_(use_CFI_info)( &ip, &sp, &fp, fp_min, fp_max ) ) {
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ips[i++] = ip;
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if (debug)
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VG_(printf)(" ipsC[%d]=%08p\n", i-1, ips[i-1]);
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ip = ip - 1;
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continue;
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}
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/* If VG_(use_CFI_info) fails, it won't modify ip/sp/fp, so
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we can safely try the old-fashioned method. */
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/* This bit is supposed to deal with frames resulting from
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functions which begin "pushl% ebp ; movl %esp, %ebp" (x86)
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or "pushq %rbp ; movq %rsp, %rbp" (amd64). Unfortunately,
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since we can't (easily) look at the insns at the start of
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the fn, like GDB does, there's no reliable way to tell.
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Hence the hack of first trying out CFI, and if that fails,
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then use this as a fallback. */
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if (fp_min <= fp && fp <= fp_max) {
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/* fp looks sane, so use it. */
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ip = (((UWord*)fp)[1]);
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sp = fp + sizeof(Addr) /*saved %ebp/%rbp*/
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+ sizeof(Addr) /*ra*/;
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fp = (((UWord*)fp)[0]);
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ips[i++] = ip;
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if (debug)
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VG_(printf)(" ipsF[%d]=%08p\n", i-1, ips[i-1]);
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ip = ip - 1;
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continue;
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}
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/* No luck there. We have to give up. */
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break;
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}
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/*--------------------- ppc32 ---------------------*/
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# elif defined(VGP_ppc32_linux)
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/* fp is %r1. ip is %cia. Note, ppc uses r1 as both the stack and
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frame pointers. */
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lr_is_first_RA = False;
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{
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# define M_VG_ERRTXT 1000
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UChar buf_lr[M_VG_ERRTXT], buf_ip[M_VG_ERRTXT];
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if (VG_(get_fnname_nodemangle) (lr, buf_lr, M_VG_ERRTXT))
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if (VG_(get_fnname_nodemangle) (ip, buf_ip, M_VG_ERRTXT))
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if (VG_(strncmp)(buf_lr, buf_ip, M_VG_ERRTXT))
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lr_is_first_RA = True;
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# undef M_VG_ERRTXT
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}
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ips[0] = ip;
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i = 1;
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fp = (((UWord*)fp)[0]);
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while (True) {
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if (i >= n_ips)
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break;
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/* Try to derive a new (ip,fp) pair from the current set. */
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if (fp_min <= fp && fp <= fp_max) {
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/* fp looks sane, so use it. */
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if (i == 1 && lr_is_first_RA)
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ip = lr;
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else
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ip = (((UWord*)fp)[1]);
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fp = (((UWord*)fp)[0]);
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ips[i++] = ip;
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if (debug)
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VG_(printf)(" ipsF[%d]=%08p\n", i-1, ips[i-1]);
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continue;
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}
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/* No luck there. We have to give up. */
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break;
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}
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# else
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# error "Unknown platform"
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# endif
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n_found = i;
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VGP_POPCC(VgpExeContext);
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return n_found;
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}
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UInt VG_(get_StackTrace) ( ThreadId tid, StackTrace ips, UInt n_ips )
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{
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/* thread in thread table */
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Addr ip = VG_(get_IP)(tid);
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Addr fp = VG_(get_FP)(tid);
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Addr sp = VG_(get_SP)(tid);
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Addr lr = VG_(get_LR)(tid);
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Addr stack_highest_word = VG_(threads)[tid].client_stack_highest_word;
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# if defined(VGP_x86_linux)
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/* Nasty little hack to deal with sysinfo syscalls - if libc is
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using the sysinfo page for syscalls (the TLS version does), then
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ip will always appear to be in that page when doing a syscall,
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not the actual libc function doing the syscall. This check sees
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if IP is within the syscall code, and pops the return address
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off the stack so that ip is placed within the library function
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calling the syscall. This makes stack backtraces much more
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useful. */
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if (ip >= (Addr)&VG_(trampoline_stuff_start)
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&& ip < (Addr)&VG_(trampoline_stuff_end)
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&& VG_(am_is_valid_for_client)(sp, sizeof(Addr), VKI_PROT_READ)) {
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ip = *(Addr *)sp;
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sp += sizeof(Addr);
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}
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# endif
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if (0)
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VG_(printf)("tid %d: stack_highest=%p ip=%p sp=%p fp=%p\n",
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tid, stack_highest_word, ip, sp, fp);
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return VG_(get_StackTrace2)(ips, n_ips, ip, sp, fp, lr, sp, stack_highest_word);
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}
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static void printIpDesc(UInt n, Addr ip)
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{
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#define BUF_LEN 4096
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static UChar buf[BUF_LEN];
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VG_(describe_IP)(ip, buf, BUF_LEN);
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if (VG_(clo_xml)) {
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VG_(message)(Vg_UserMsg, " %s", buf);
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} else {
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VG_(message)(Vg_UserMsg, " %s %s", ( n == 0 ? "at" : "by" ), buf);
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}
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}
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/* Print a StackTrace. */
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void VG_(pp_StackTrace) ( StackTrace ips, UInt n_ips )
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{
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vg_assert( n_ips > 0 );
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if (VG_(clo_xml))
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VG_(message)(Vg_UserMsg, " <stack>");
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VG_(apply_StackTrace)( printIpDesc, ips, n_ips );
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if (VG_(clo_xml))
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VG_(message)(Vg_UserMsg, " </stack>");
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}
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/* Get and immediately print a StackTrace. */
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void VG_(get_and_pp_StackTrace) ( ThreadId tid, UInt n_ips )
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{
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Addr ips[n_ips];
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VG_(get_StackTrace)(tid, ips, n_ips);
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VG_(pp_StackTrace) ( ips, n_ips);
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}
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void VG_(apply_StackTrace)( void(*action)(UInt n, Addr ip),
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StackTrace ips, UInt n_ips )
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{
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#define MYBUF_LEN 10 // only needs to be long enough for "main"
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Bool main_done = False;
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Char mybuf[MYBUF_LEN]; // ok to stack allocate mybuf[] -- it's tiny
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Int i = 0;
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vg_assert(n_ips > 0);
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do {
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Addr ip = ips[i];
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if (i > 0)
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ip -= VG_MIN_INSTR_SZB; // point to calling line
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// Stop after "main"; if main() is recursive, stop after last main().
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if ( ! VG_(clo_show_below_main)) {
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VG_(get_fnname_nodemangle)( ip, mybuf, MYBUF_LEN );
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if ( VG_STREQ("main", mybuf) )
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main_done = True;
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else if (main_done)
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break;
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}
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// Act on the ip
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action(i, ip);
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i++;
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} while (i < n_ips && ips[i] != 0);
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#undef MYBUF_LEN
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}
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/*--------------------------------------------------------------------*/
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/*--- end ---*/
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/*--------------------------------------------------------------------*/
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