commit 6dfbf4f71d9af027460eacffe7c59f9f60836e95 Author: Nedko Arnaudov Date: Mon Dec 3 22:47:23 2012 +0200 Initial implementation diff --git a/GNUmakefile b/GNUmakefile new file mode 100644 index 0000000..e6bfa35 --- /dev/null +++ b/GNUmakefile @@ -0,0 +1,3 @@ +test: + gcc -g -DSIGINFO_TEST -Wall -Wextra siginfo.c -ldl -lstdc++ -rdynamic -o /tmp/siginfo + -/tmp/siginfo diff --git a/gpl2.txt b/gpl2.txt new file mode 100644 index 0000000..999ca85 --- /dev/null +++ b/gpl2.txt @@ -0,0 +1,340 @@ + GNU GENERAL PUBLIC LICENSE + Version 2, June 1991 + + Copyright (C) 1989, 1991 Free Software Foundation, Inc. + 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The licenses for most software are designed to take away your +freedom to share and change it. By contrast, the GNU General Public +License is intended to guarantee your freedom to share and change free +software--to make sure the software is free for all its users. This +General Public License applies to most of the Free Software +Foundation's software and to any other program whose authors commit to +using it. (Some other Free Software Foundation software is covered by +the GNU Library General Public License instead.) You can apply it to +your programs, too. + + When we speak of free software, we are referring to freedom, not +price. Our General Public Licenses are designed to make sure that you +have the freedom to distribute copies of free software (and charge for +this service if you wish), that you receive source code or can get it +if you want it, that you can change the software or use pieces of it +in new free programs; and that you know you can do these things. + + To protect your rights, we need to make restrictions that forbid +anyone to deny you these rights or to ask you to surrender the rights. +These restrictions translate to certain responsibilities for you if you +distribute copies of the software, or if you modify it. + + For example, if you distribute copies of such a program, whether +gratis or for a fee, you must give the recipients all the rights that +you have. You must make sure that they, too, receive or can get the +source code. And you must show them these terms so they know their +rights. + + We protect your rights with two steps: (1) copyright the software, and +(2) offer you this license which gives you legal permission to copy, +distribute and/or modify the software. + + Also, for each author's protection and ours, we want to make certain +that everyone understands that there is no warranty for this free +software. If the software is modified by someone else and passed on, we +want its recipients to know that what they have is not the original, so +that any problems introduced by others will not reflect on the original +authors' reputations. + + Finally, any free program is threatened constantly by software +patents. We wish to avoid the danger that redistributors of a free +program will individually obtain patent licenses, in effect making the +program proprietary. To prevent this, we have made it clear that any +patent must be licensed for everyone's free use or not licensed at all. + + The precise terms and conditions for copying, distribution and +modification follow. + + GNU GENERAL PUBLIC LICENSE + TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION + + 0. This License applies to any program or other work which contains +a notice placed by the copyright holder saying it may be distributed +under the terms of this General Public License. The "Program", below, +refers to any such program or work, and a "work based on the Program" +means either the Program or any derivative work under copyright law: +that is to say, a work containing the Program or a portion of it, +either verbatim or with modifications and/or translated into another +language. (Hereinafter, translation is included without limitation in +the term "modification".) Each licensee is addressed as "you". + +Activities other than copying, distribution and modification are not +covered by this License; they are outside its scope. The act of +running the Program is not restricted, and the output from the Program +is covered only if its contents constitute a work based on the +Program (independent of having been made by running the Program). +Whether that is true depends on what the Program does. + + 1. You may copy and distribute verbatim copies of the Program's +source code as you receive it, in any medium, provided that you +conspicuously and appropriately publish on each copy an appropriate +copyright notice and disclaimer of warranty; keep intact all the +notices that refer to this License and to the absence of any warranty; +and give any other recipients of the Program a copy of this License +along with the Program. + +You may charge a fee for the physical act of transferring a copy, and +you may at your option offer warranty protection in exchange for a fee. + + 2. You may modify your copy or copies of the Program or any portion +of it, thus forming a work based on the Program, and copy and +distribute such modifications or work under the terms of Section 1 +above, provided that you also meet all of these conditions: + + a) You must cause the modified files to carry prominent notices + stating that you changed the files and the date of any change. + + b) You must cause any work that you distribute or publish, that in + whole or in part contains or is derived from the Program or any + part thereof, to be licensed as a whole at no charge to all third + parties under the terms of this License. + + c) If the modified program normally reads commands interactively + when run, you must cause it, when started running for such + interactive use in the most ordinary way, to print or display an + announcement including an appropriate copyright notice and a + notice that there is no warranty (or else, saying that you provide + a warranty) and that users may redistribute the program under + these conditions, and telling the user how to view a copy of this + License. (Exception: if the Program itself is interactive but + does not normally print such an announcement, your work based on + the Program is not required to print an announcement.) + +These requirements apply to the modified work as a whole. If +identifiable sections of that work are not derived from the Program, +and can be reasonably considered independent and separate works in +themselves, then this License, and its terms, do not apply to those +sections when you distribute them as separate works. But when you +distribute the same sections as part of a whole which is a work based +on the Program, the distribution of the whole must be on the terms of +this License, whose permissions for other licensees extend to the +entire whole, and thus to each and every part regardless of who wrote it. + +Thus, it is not the intent of this section to claim rights or contest +your rights to work written entirely by you; rather, the intent is to +exercise the right to control the distribution of derivative or +collective works based on the Program. + +In addition, mere aggregation of another work not based on the Program +with the Program (or with a work based on the Program) on a volume of +a storage or distribution medium does not bring the other work under +the scope of this License. + + 3. You may copy and distribute the Program (or a work based on it, +under Section 2) in object code or executable form under the terms of +Sections 1 and 2 above provided that you also do one of the following: + + a) Accompany it with the complete corresponding machine-readable + source code, which must be distributed under the terms of Sections + 1 and 2 above on a medium customarily used for software interchange; or, + + b) Accompany it with a written offer, valid for at least three + years, to give any third party, for a charge no more than your + cost of physically performing source distribution, a complete + machine-readable copy of the corresponding source code, to be + distributed under the terms of Sections 1 and 2 above on a medium + customarily used for software interchange; or, + + c) Accompany it with the information you received as to the offer + to distribute corresponding source code. (This alternative is + allowed only for noncommercial distribution and only if you + received the program in object code or executable form with such + an offer, in accord with Subsection b above.) + +The source code for a work means the preferred form of the work for +making modifications to it. For an executable work, complete source +code means all the source code for all modules it contains, plus any +associated interface definition files, plus the scripts used to +control compilation and installation of the executable. However, as a +special exception, the source code distributed need not include +anything that is normally distributed (in either source or binary +form) with the major components (compiler, kernel, and so on) of the +operating system on which the executable runs, unless that component +itself accompanies the executable. + +If distribution of executable or object code is made by offering +access to copy from a designated place, then offering equivalent +access to copy the source code from the same place counts as +distribution of the source code, even though third parties are not +compelled to copy the source along with the object code. + + 4. You may not copy, modify, sublicense, or distribute the Program +except as expressly provided under this License. Any attempt +otherwise to copy, modify, sublicense or distribute the Program is +void, and will automatically terminate your rights under this License. +However, parties who have received copies, or rights, from you under +this License will not have their licenses terminated so long as such +parties remain in full compliance. + + 5. You are not required to accept this License, since you have not +signed it. However, nothing else grants you permission to modify or +distribute the Program or its derivative works. These actions are +prohibited by law if you do not accept this License. Therefore, by +modifying or distributing the Program (or any work based on the +Program), you indicate your acceptance of this License to do so, and +all its terms and conditions for copying, distributing or modifying +the Program or works based on it. + + 6. Each time you redistribute the Program (or any work based on the +Program), the recipient automatically receives a license from the +original licensor to copy, distribute or modify the Program subject to +these terms and conditions. You may not impose any further +restrictions on the recipients' exercise of the rights granted herein. +You are not responsible for enforcing compliance by third parties to +this License. + + 7. If, as a consequence of a court judgment or allegation of patent +infringement or for any other reason (not limited to patent issues), +conditions are imposed on you (whether by court order, agreement or +otherwise) that contradict the conditions of this License, they do not +excuse you from the conditions of this License. If you cannot +distribute so as to satisfy simultaneously your obligations under this +License and any other pertinent obligations, then as a consequence you +may not distribute the Program at all. For example, if a patent +license would not permit royalty-free redistribution of the Program by +all those who receive copies directly or indirectly through you, then +the only way you could satisfy both it and this License would be to +refrain entirely from distribution of the Program. + +If any portion of this section is held invalid or unenforceable under +any particular circumstance, the balance of the section is intended to +apply and the section as a whole is intended to apply in other +circumstances. + +It is not the purpose of this section to induce you to infringe any +patents or other property right claims or to contest validity of any +such claims; this section has the sole purpose of protecting the +integrity of the free software distribution system, which is +implemented by public license practices. Many people have made +generous contributions to the wide range of software distributed +through that system in reliance on consistent application of that +system; it is up to the author/donor to decide if he or she is willing +to distribute software through any other system and a licensee cannot +impose that choice. + +This section is intended to make thoroughly clear what is believed to +be a consequence of the rest of this License. + + 8. If the distribution and/or use of the Program is restricted in +certain countries either by patents or by copyrighted interfaces, the +original copyright holder who places the Program under this License +may add an explicit geographical distribution limitation excluding +those countries, so that distribution is permitted only in or among +countries not thus excluded. In such case, this License incorporates +the limitation as if written in the body of this License. + + 9. The Free Software Foundation may publish revised and/or new versions +of the General Public License from time to time. Such new versions will +be similar in spirit to the present version, but may differ in detail to +address new problems or concerns. + +Each version is given a distinguishing version number. If the Program +specifies a version number of this License which applies to it and "any +later version", you have the option of following the terms and conditions +either of that version or of any later version published by the Free +Software Foundation. If the Program does not specify a version number of +this License, you may choose any version ever published by the Free Software +Foundation. + + 10. If you wish to incorporate parts of the Program into other free +programs whose distribution conditions are different, write to the author +to ask for permission. For software which is copyrighted by the Free +Software Foundation, write to the Free Software Foundation; we sometimes +make exceptions for this. Our decision will be guided by the two goals +of preserving the free status of all derivatives of our free software and +of promoting the sharing and reuse of software generally. + + NO WARRANTY + + 11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY +FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN +OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES +PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED +OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF +MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS +TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE +PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, +REPAIR OR CORRECTION. + + 12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING +WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR +REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, +INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING +OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED +TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY +YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER +PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE +POSSIBILITY OF SUCH DAMAGES. + + END OF TERMS AND CONDITIONS + + How to Apply These Terms to Your New Programs + + If you develop a new program, and you want it to be of the greatest +possible use to the public, the best way to achieve this is to make it +free software which everyone can redistribute and change under these terms. + + To do so, attach the following notices to the program. It is safest +to attach them to the start of each source file to most effectively +convey the exclusion of warranty; and each file should have at least +the "copyright" line and a pointer to where the full notice is found. + + + Copyright (C) + + 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + + +Also add information on how to contact you by electronic and paper mail. + +If the program is interactive, make it output a short notice like this +when it starts in an interactive mode: + + Gnomovision version 69, Copyright (C) year name of author + Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, the commands you use may +be called something other than `show w' and `show c'; they could even be +mouse-clicks or menu items--whatever suits your program. + +You should also get your employer (if you work as a programmer) or your +school, if any, to sign a "copyright disclaimer" for the program, if +necessary. Here is a sample; alter the names: + + Yoyodyne, Inc., hereby disclaims all copyright interest in the program + `Gnomovision' (which makes passes at compilers) written by James Hacker. + + , 1 April 1989 + Ty Coon, President of Vice + +This General Public License does not permit incorporating your program into +proprietary programs. If your program is a subroutine library, you may +consider it more useful to permit linking proprietary applications with the +library. If this is what you want to do, use the GNU Library General +Public License instead of this License. diff --git a/siginfo.c b/siginfo.c new file mode 100644 index 0000000..c900f3f --- /dev/null +++ b/siginfo.c @@ -0,0 +1,491 @@ +/* -*- Mode: C ; c-basic-offset: 4 -*- */ +/* + * Copyright (C) 2012 Nedko Arnaudov + * + * print out a stack-trace when program segfaults + * + * Inspiration: sigsegv.c by Jaco Kroon + * + * 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, see + * or write to the Free Software Foundation, Inc., + * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#if defined(HAVE_CONFIG_H) +# include "config.h" +#endif + +/* These are "defined" for documentation purposes. They should come from the build system with or without config.h */ +#if 0 +# define SIGINFO_CPP_DEMANGLE /* whether to attempt c++ demangle. if used, you must link with libstdc++ */ +# define SIGINFO_AUTO_INIT /* whether to use gcc constructor function for automatic initialization */ +#endif + +#if !defined(SIGINFO_TEST) +# if !defined siginfo_log +# error "siginfo_log not defined" +# endif +#else +# define siginfo_log(fmt, args...) fprintf(stderr, fmt "\n", ##args); +#endif + +/* dladdr() is a glibc extension */ +#ifndef _GNU_SOURCE +# define _GNU_SOURCE +#endif + +#include +#include +#include +#include +#include +#include +#include + +#define SIGINFO_MAX_BT_FRAMES 20 + +#if defined(SA_SIGINFO) && !defined(__arm__) && !defined(__ia64__) && !defined(__alpha__) && !defined (__FreeBSD_kernel__) && !defined (__sh__) && !defined(__APPLE__) +# define USE_UCONTEXT +# include +#endif + +#if defined(__powerpc64__) +# define SIGINFO_REGISTER(ucontext, index) ((ucontext)->uc_mcontext.gp_regs[index]) +#elif defined(__powerpc__) +# define SIGINFO_REGISTER(ucontext, index) ((ucontext)->uc_mcontext.uc_regs[index]) +#elif defined(__sparc__) && defined(__arch64__) +# define SIGINFO_REGISTER(ucontext, index) ((ucontext)->uc_mcontext.mc_gregs[index]) +#else +# define SIGINFO_REGISTER(ucontext, index) ((ucontext)->uc_mcontext.gregs[index]) +#endif + +#if defined(REG_RIP) +# define SIGINFO_IP_REG REG_RIP +# define SIGINFO_BP_REG REG_RBP +# define SIGINFO_REGFORMAT "%016llx" +# define UINT_PTR_TYPE unsigned long long +#elif defined(REG_EIP) +# define SIGINFO_IP_REG REG_EIP +# define SIGINFO_BP_REG REG_EBP +# define SIGINFO_REGFORMAT "%08lx" +# define UINT_PTR_TYPE unsigned long +#else +# define SIGINFO_REGFORMAT "%x" +# define SIGINFO_STACK_GENERIC +#endif + +struct si_code_descriptor +{ + int code; + const char * description; +}; + +#ifdef USE_UCONTEXT +static struct si_code_descriptor sig_ill_codes[] = +{ + { ILL_ILLOPC, "ILL_ILLOPC; Illegal opcode" }, + { ILL_ILLOPN, "ILL_ILLOPN; Illegal operand" }, + { ILL_ILLADR, "ILL_ILLADR; Illegal addressing mode" }, + { ILL_ILLTRP, "ILL_ILLTRP; Illegal trap" }, + { ILL_PRVOPC, "ILL_PRVOPC; Privileged opcode" }, + { ILL_PRVREG, "ILL_PRVREG; Privileged register" }, + { ILL_COPROC, "ILL_COPROC; Coprocessor error" }, + { ILL_BADSTK, "ILL_BADSTK; Internal stack error" }, + { 0, NULL } +}; + +static struct si_code_descriptor sig_fpe_codes[] = +{ + { FPE_INTDIV, "FPE_INTDIV; Integer divide by zero" }, + { FPE_INTOVF, "FPE_INTOVF; Integer overflow" }, + { FPE_FLTDIV, "FPE_FLTDIV; Floating-point divide by zero" }, + { FPE_FLTOVF, "FPE_FLTOVF; Floating-point overflow" }, + { FPE_FLTUND, "FPE_FLTUND; Floating-point underflow" }, + { FPE_FLTRES, "FPE_FLTRES; Floating-point inexact result" }, + { FPE_FLTINV, "FPE_FLTINV; Invalid floating-point operation" }, + { FPE_FLTSUB, "FPE_FLTSUB; Subscript out of range" }, + { 0, NULL } +}; + +static struct si_code_descriptor sig_segv_codes[] = { + { SEGV_MAPERR, "SEGV_MAPERR; Address not mapped to object" }, + { SEGV_ACCERR, "SEGV_ACCERR; Invalid permissions for mapped object" }, + { 0, NULL } +}; + +static struct si_code_descriptor sig_bus_codes[] = +{ + { BUS_ADRALN, "BUS_ADRALN; Invalid address alignment" }, + { BUS_ADRERR, "BUS_ADRERR; Nonexistent physical address" }, + { BUS_OBJERR, "BUS_OBJERR; Object-specific hardware error" }, + { 0, NULL } +}; + +static struct si_code_descriptor sig_any_codes[] = +{ + { SI_USER, "SI_USER; sent by kill, sigsend, raise" }, +#if defined(SI_KERNEL) + { SI_KERNEL, "SI_KERNEL; sent by the kernel from somewhere" }, +#endif + { SI_QUEUE, "SI_QUEUE; Signal sent by the sigqueue()" }, + { SI_TIMER, "SI_TIMER; Signal generated by expiration of a timer set by timer_settime()" }, + { SI_ASYNCIO, "SI_ASYNCIO; Signal generated by completion of an asynchronous I/O request" }, + { SI_MESGQ, "SI_MESGQ; Signal generated by arrival of a message on an empty message queue" }, +#if defined(SI_ASYNCIO) + { SI_ASYNCIO, "SI_ASYNCIO; sent by AIO completion" }, +#endif +#if defined(SI_SIGIO) + { SI_SIGIO, "SI_SIGIO; sent by queued SIGIO" }, +#endif +#if defined(SI_TKILL) + { SI_TKILL, "SI_TKILL; sent by tkill system call" }, +#endif +#if defined(SI_DETHREAD) + { SI_DETHREAD, "SI_DETHREAD; sent by execve() killing subsidiary threads" }, +#endif + { 0, NULL } +}; +#else /* #ifdef USE_UCONTEXT */ +# define sig_ill_codes NULL +# define sig_fpe_codes NULL +# define sig_segv_codes NULL +# define sig_bus_codes NULL +#endif /* #ifdef USE_UCONTEXT */ + +struct signal_descriptor +{ + int signo; + const char * descr; + struct si_code_descriptor * codes; + const char * msg; +}; + +static struct signal_descriptor signal_descriptors[] = +{ + { SIGILL, "SIGILL", sig_ill_codes, "Illegal instruction" }, + { SIGFPE, "SIGFPE", sig_fpe_codes, "Floating point exception" }, + { SIGSEGV, "SIGSEGV", sig_segv_codes, "Segmentation Fault" }, + { SIGBUS, "SIGBUS", sig_bus_codes, "Bus error (bad memory access)" }, + { SIGABRT, "SIGABRT", NULL, "Abort" }, +}; + +/* ucontext is required for non-generic stack backtrace */ +#if !defined(USE_UCONTEXT) && !defined(SIGINFO_STACK_GENERIC) +# define SIGINFO_STACK_GENERIC +#endif + +#if defined(SIGINFO_STACK_GENERIC) + +static void dump_stack(ucontext_t * ucontext) +{ + size_t i; + void * bt[SIGINFO_MAX_BT_FRAMES]; + char ** strings; + size_t sz; + + ((void)(ucontext)); /* unreferenced parameter */ + + siginfo_log("Stack trace (generic):"); + + sz = backtrace(bt, SIGINFO_MAX_BT_FRAMES); + strings = backtrace_symbols(bt, sz); + + for (i = 0; i < sz; i++) + { + siginfo_log("%2zu: %s", i, strings[i]); + } + + siginfo_log("End of stack trace"); +} + +#else /* #if defined(SIGINFO_STACK_GENERIC) */ + +#if defined(SIGINFO_CPP_DEMANGLE) +char * __cxa_demangle(const char * __mangled_name, char * __output_buffer, size_t * __length, int * __status); +#endif + +static void dump_stack(ucontext_t * ucontext) +{ + int frame; + Dl_info dlinfo; + void ** bp; + void * ip; + const char * symname; +#if defined(SIGINFO_CPP_DEMANGLE) + int demangle_status; + char * demangled_name; +#endif + + ip = (void *) SIGINFO_REGISTER(ucontext, SIGINFO_IP_REG); + bp = (void **)SIGINFO_REGISTER(ucontext, SIGINFO_BP_REG); + + siginfo_log("Stack trace:"); + + for (frame = 0; bp != NULL && ip != NULL; frame++, ip = bp[1], bp = (void **)bp[0]) + { + //siginfo_log("IP=%p BP=%p", ip, bp); + if (dladdr(ip, &dlinfo) == 0) + { + siginfo_log("%2d: [dladdr failed for %p]", frame, ip); + continue; + } + + symname = dlinfo.dli_sname; +#if defined(SIGINFO_CPP_DEMANGLE) + demangled_name = __cxa_demangle(symname, NULL, 0, &demangle_status); + if (demangle_status == 0 && demangled_name != NULL) + { + symname = demangled_name; + } +#endif + + siginfo_log( + "%2d: 0x" SIGINFO_REGFORMAT " <%s+%d> (%s)", + frame, + (UINT_PTR_TYPE)ip, + symname, + (int)(ip - dlinfo.dli_saddr), + dlinfo.dli_fname); + +#if defined(SIGINFO_NO_CPP_DEMANGLE) + free(demangled_name); +#endif + + if (dlinfo.dli_sname && strcmp(dlinfo.dli_sname, "main") == 0) break; + } + + siginfo_log("End of stack trace"); +} + +#endif /* #if defined(SIGINFO_STACK_GENERIC) */ + +static struct signal_descriptor * lookup_signal_descriptor(int signo) +{ + size_t i; + + for (i = 0; i < sizeof(signal_descriptors) / sizeof(signal_descriptors[0]); i++) + { + if (signal_descriptors[i].signo == signo) + { + return signal_descriptors + i; + } + } + + return NULL; +} + +#if defined(USE_UCONTEXT) +static const char * si_code_description_lookup(struct si_code_descriptor * descr_ptr, int si_code) +{ + while (descr_ptr->description != NULL) + { + if (descr_ptr->code == si_code) + { + return descr_ptr->description; + } + + descr_ptr++; + } + + return NULL; +} + +static const char * si_code_description(struct signal_descriptor * descr_ptr, int si_code) +{ + const char * si_code_str = NULL; + + si_code_str = si_code_description_lookup(sig_any_codes, si_code); + if (si_code_str != NULL) + { + return si_code_str; + } + + if (descr_ptr != NULL && descr_ptr->codes != NULL) + { + return si_code_description_lookup(descr_ptr->codes, si_code); + } + + return "unknown"; +} +#endif /* #if defined(USE_UCONTEXT) */ + +static void dump_siginfo(int signo, siginfo_t * info) +{ + struct signal_descriptor * descr_ptr; + + descr_ptr = lookup_signal_descriptor(signo); + if (descr_ptr != NULL) + { + siginfo_log("%s! (%s)", descr_ptr->msg, descr_ptr->descr); + } + else + { + siginfo_log("Unknown bad signal %d catched!", signo); + } + +#if defined(USE_UCONTEXT) + siginfo_log("info.si_signo = %d", info->si_signo); + siginfo_log("info.si_errno = %d", info->si_errno); + siginfo_log("info.si_code = %d (%s)", info->si_code, si_code_description(descr_ptr, info->si_code)); + siginfo_log("info.si_addr = %p", info->si_addr); +#else + (void)info; /* unused parameter */ +#endif +} + +#if defined(USE_UCONTEXT) +#define REGISTER_NAME_CASE(x) case REG_ ## x: return #x +static const char * register_name(size_t i) +{ + switch (i) + { +#if defined(REG_EIP) + REGISTER_NAME_CASE(GS); + REGISTER_NAME_CASE(FS); + REGISTER_NAME_CASE(ES); + REGISTER_NAME_CASE(DS); + REGISTER_NAME_CASE(EDI); + REGISTER_NAME_CASE(ESI); + REGISTER_NAME_CASE(EBP); + REGISTER_NAME_CASE(ESP); + REGISTER_NAME_CASE(EBX); + REGISTER_NAME_CASE(EDX); + REGISTER_NAME_CASE(ECX); + REGISTER_NAME_CASE(EAX); + REGISTER_NAME_CASE(TRAPNO); + REGISTER_NAME_CASE(ERR); + REGISTER_NAME_CASE(EIP); + REGISTER_NAME_CASE(CS); + REGISTER_NAME_CASE(EFL); + REGISTER_NAME_CASE(UESP); + REGISTER_NAME_CASE(SS); +#endif + } + + return NULL; +} + +static void dump_registers(ucontext_t * ucontext) +{ + size_t index; + const char * name; + char buffer[64]; + + for (index = 0; index < NGREG; index++) + { + name = register_name(index); + if (name == NULL) + { + snprintf(buffer, sizeof(buffer), "reg[%02d]", (int)index); + name = buffer; + } + + siginfo_log("%6s = 0x" SIGINFO_REGFORMAT, name, (UINT_PTR_TYPE)SIGINFO_REGISTER(ucontext, index)); + } +} +#endif /* #if defined(USE_UCONTEXT) */ + +static void signal_handler(int signum, siginfo_t * info, void * ptr) +{ + dump_siginfo(signum, info); +#if defined(USE_UCONTEXT) + dump_registers(ptr); +#endif + dump_stack(ptr); + exit(-1); +} + +#if defined(SIGINFO_AUTO_INIT) +static +#endif +int setup_siginfo(void) +{ + struct sigaction action; + size_t i; + + memset(&action, 0, sizeof(action)); + action.sa_sigaction = signal_handler; +#ifdef SA_SIGINFO + action.sa_flags = SA_SIGINFO; +#endif + + for (i = 0; i < sizeof(signal_descriptors) / sizeof(signal_descriptors[0]); i++) + { + if (sigaction(signal_descriptors[i].signo, &action, NULL) < 0) + { + siginfo_log("sigaction failed for signal %d. errno is %d (%s)", signal_descriptors[i].signo, errno, strerror(errno)); + return 0; + } + } + + return 1; +} + +#if defined(SIGINFO_AUTO_INIT) +static void __attribute((constructor)) init(void) +{ + setup_siginfo(); +} +#endif + +#if defined(SIGINFO_TEST) + +void crash_abort(void) +{ + abort(); +} + +void crash_access(void) +{ + /* why this doesnt cause FPE? */ + *((float *)123) = 1000.0 / 0.0; +} + +void crash_call(void) +{ + ((void (*)(void))(0xDEADBEEF))(); +} + +static void (* tests [])(void) = +{ + crash_abort, + crash_access, + crash_call, +}; + +int main(int argc, char ** argv) +{ + unsigned int index; + + setup_siginfo(); + + if (argc > 1) + { + index = atoi(argv[1]); + if (index >= sizeof(tests) / sizeof(tests[0])) + { + siginfo_log("invalid index %d, using 0 instead", index); + index = 0; + } + } + else + { + index = 0; + } + + tests[index](); + + return 0; +} +#endif diff --git a/siginfo.h b/siginfo.h new file mode 100644 index 0000000..ceb7ee8 --- /dev/null +++ b/siginfo.h @@ -0,0 +1,31 @@ +/* -*- Mode: C ; c-basic-offset: 4 -*- */ +/* + * Copyright (C) 2012 Nedko Arnaudov + * + * print out a stack-trace when program segfaults + * + * 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, see + * or write to the Free Software Foundation, Inc., + * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#ifndef SIGINFO_H__6CFF6012_DED0_4089_8634_F4515370BD10__INCLUDED +#define SIGINFO_H__6CFF6012_DED0_4089_8634_F4515370BD10__INCLUDED + +#ifdef __cplusplus +extern "C" +#endif +int setup_sigsegv(); + +#endif /* #ifndef SIGINFO_H__6CFF6012_DED0_4089_8634_F4515370BD10__INCLUDED */