[9d944b2] | 1 | // |
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| 2 | // Cforall Version 1.0.0 Copyright (C) 2016 University of Waterloo |
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| 3 | // |
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| 4 | // The contents of this file are covered under the licence agreement in the |
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| 5 | // file "LICENCE" distributed with Cforall. |
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| 6 | // |
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| 7 | // interpose.c -- |
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| 8 | // |
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| 9 | // Author : Thierry Delisle |
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| 10 | // Created On : Wed Mar 29 16:10:31 2017 |
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[6b0b624] | 11 | // Last Modified By : Peter A. Buhr |
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[a3f820b] | 12 | // Last Modified On : Thu Jan 11 18:45:31 2024 |
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| 13 | // Update Count : 218 |
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[9d944b2] | 14 | // |
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| 15 | |
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[851fd92] | 16 | #include <stdio.h> |
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[7867eb9] | 17 | #include <unistd.h> // _exit, getpid |
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[67db067] | 18 | extern "C" { |
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[7867eb9] | 19 | #include <dlfcn.h> // dlopen, dlsym |
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[a3f820b] | 20 | //#include <link.h> // dl_iterate_phdr |
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| 21 | struct dl_phdr_info; |
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| 22 | int dl_iterate_phdr( int (*)( struct dl_phdr_info *, size_t, void * ), void * ); |
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[7867eb9] | 23 | #include <execinfo.h> // backtrace, messages |
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[9d944b2] | 24 | } |
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| 25 | |
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[73abe95] | 26 | #include "bits/defs.hfa" |
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| 27 | #include "bits/signal.hfa" // sigHandler_? |
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[e0cc9e0] | 28 | #include "concurrency/kernel/fwd.hfa" // disable_interrupts, enable_interrupts |
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[73abe95] | 29 | #include "startup.hfa" // STARTUP_PRIORITY_CORE |
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[1d94116] | 30 | #include <assert.h> |
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[9d944b2] | 31 | |
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[3d5f2ef1] | 32 | //============================================================================================= |
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| 33 | // Interposing helpers |
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| 34 | //============================================================================================= |
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| 35 | |
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[032234bd] | 36 | static void preload_libgcc(void) { |
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[ad64520] | 37 | dlopen( "libgcc_s.so.1", RTLD_NOW ); |
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| 38 | if ( const char * error = dlerror() ) abort( "interpose_symbol : internal error pre-loading libgcc, %s\n", error ); |
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| 39 | } |
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| 40 | |
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[67db067] | 41 | typedef void (* generic_fptr_t)(void); |
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[95dab9e] | 42 | |
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[089a0d7] | 43 | static generic_fptr_t do_interpose_symbol( void * library, const char symbol[], const char version[] ) { |
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[95dab9e] | 44 | union { generic_fptr_t fptr; void * ptr; } originalFunc; |
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| 45 | |
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[e10714a] | 46 | #if defined( _GNU_SOURCE ) |
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| 47 | if ( version ) { |
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| 48 | originalFunc.ptr = dlvsym( library, symbol, version ); |
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| 49 | } else { |
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| 50 | originalFunc.ptr = dlsym( library, symbol ); |
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| 51 | } // if |
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| 52 | #else |
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[c910709] | 53 | originalFunc.ptr = dlsym( library, symbol ); |
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[e10714a] | 54 | #endif // _GNU_SOURCE |
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| 55 | |
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| 56 | if ( ! originalFunc.ptr ) { // == nullptr |
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[089a0d7] | 57 | abort( "interpose_symbol : internal error, %s\n", dlerror() ); |
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| 58 | } // if |
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[95dab9e] | 59 | return originalFunc.fptr; |
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| 60 | } |
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| 61 | |
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[032234bd] | 62 | static generic_fptr_t interpose_symbol( const char symbol[], const char version[] ) { |
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[8bb46d2] | 63 | void * library; |
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[e10714a] | 64 | |
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[8bb46d2] | 65 | #if defined( RTLD_NEXT ) |
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| 66 | library = RTLD_NEXT; |
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| 67 | #else |
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[089a0d7] | 68 | // missing RTLD_NEXT => must hard-code library name, assuming libstdc++ |
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[8bb46d2] | 69 | library = dlopen( "libc.so.6", RTLD_LAZY ); |
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[089a0d7] | 70 | if ( ! library ) { // == nullptr |
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| 71 | abort( "interpose_symbol : failed to open libc, %s\n", dlerror() ); |
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[9d944b2] | 72 | } // if |
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[089a0d7] | 73 | #endif // RTLD_NEXT |
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[9d944b2] | 74 | |
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[089a0d7] | 75 | return do_interpose_symbol( library, symbol, version ); |
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[9d944b2] | 76 | } |
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| 77 | |
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[67db067] | 78 | #define INTERPOSE_LIBC( x, ver ) __cabi_libc.x = (typeof(__cabi_libc.x))interpose_symbol( #x, ver ) |
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[3d5f2ef1] | 79 | |
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| 80 | //============================================================================================= |
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[67db067] | 81 | // Interposition Startup logic |
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[3d5f2ef1] | 82 | //============================================================================================= |
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[9d944b2] | 83 | |
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[032234bd] | 84 | static void sigHandler_segv( __CFA_SIGPARMS__ ); |
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| 85 | static void sigHandler_ill ( __CFA_SIGPARMS__ ); |
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| 86 | static void sigHandler_fpe ( __CFA_SIGPARMS__ ); |
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| 87 | static void sigHandler_abrt( __CFA_SIGPARMS__ ); |
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| 88 | static void sigHandler_term( __CFA_SIGPARMS__ ); |
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[dbe9b08] | 89 | |
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[032234bd] | 90 | static struct { |
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[d7312ac] | 91 | void (* exit)( int ) __attribute__(( __noreturn__ )); |
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| 92 | void (* abort)( void ) __attribute__(( __noreturn__ )); |
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[e0cc9e0] | 93 | int (* dl_iterate_phdr)( int (*)( struct dl_phdr_info *, size_t, void * ), void * ); |
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[3d5f2ef1] | 94 | } __cabi_libc; |
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| 95 | |
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[032234bd] | 96 | libcfa_public int cfa_main_returned; |
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[7dd98b6] | 97 | |
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[6bfe5cc] | 98 | extern "C" { |
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[95dab9e] | 99 | void __cfathreadabi_interpose_startup( generic_fptr_t (*do_interpose_symbol)( void * library, const char symbol[], const char version[] ) ) __attribute__((weak)); |
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[6bfe5cc] | 100 | void __cfaabi_interpose_startup( void ) { |
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[8a13c47] | 101 | const char *version = 0p; |
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[7dd98b6] | 102 | cfa_main_returned = 0; |
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[9d944b2] | 103 | |
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[ad64520] | 104 | preload_libgcc(); |
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| 105 | |
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[43f29f6] | 106 | #pragma GCC diagnostic push |
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| 107 | #pragma GCC diagnostic ignored "-Wdiscarded-qualifiers" |
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[3d5f2ef1] | 108 | INTERPOSE_LIBC( abort, version ); |
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[e0cc9e0] | 109 | INTERPOSE_LIBC( exit, version ); |
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| 110 | INTERPOSE_LIBC( dl_iterate_phdr, version ); |
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[43f29f6] | 111 | #pragma GCC diagnostic pop |
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[dbe9b08] | 112 | |
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[95dab9e] | 113 | if(__cfathreadabi_interpose_startup) __cfathreadabi_interpose_startup( do_interpose_symbol ); |
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| 114 | |
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[8bb46d2] | 115 | // SKULLDUGGERY: In Ubuntu 22.04, someone augmented signal.h to allow SIGSTKSZ to be "sysconf(_SC_SIGSTKSZ)" in |
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| 116 | // sigstksz.h, as well as 8192 in sigstack.h. HOWEVER, they forgot to provide a mechanism to tell signal.h to |
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| 117 | // use sigstack.h rather than sigstksz.h. (I'm not happy.) By undefining _GNU_SOURCE before signal.h and |
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| 118 | // redefining it afterwards, you can get 8192, but then nothing works correctly inside of signal.h without |
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| 119 | // _GNU_SOURCE defined. So what is needed is a way to get signal.h to use sigstack.h WITH _GNU_SOURCE defined. |
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| 120 | // Basically something is wrong with features.h and its use in signal.h. |
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| 121 | |
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| 122 | #undef SIGSTKSZ |
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| 123 | #define SIGSTKSZ 8192 |
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| 124 | |
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[8a13c47] | 125 | // As a precaution (and necessity), errors that result in termination are delivered on a separate stack because |
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| 126 | // task stacks might be very small (4K) and the signal delivery corrupts memory to the point that a clean |
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| 127 | // shutdown is impossible. Also, when a stack overflow encounters the non-accessible sentinel page (debug only) |
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| 128 | // and generates a segment fault, the signal cannot be delivered on the sentinel page. Finally, calls to abort |
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| 129 | // print a stack trace that uses substantial stack space. |
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| 130 | |
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| 131 | #define MINSTKSZ SIGSTKSZ * 8 |
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| 132 | static char stack[MINSTKSZ] __attribute__(( aligned (16) )); |
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| 133 | static stack_t ss; |
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| 134 | |
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| 135 | ss.ss_sp = stack; |
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| 136 | ss.ss_size = MINSTKSZ; |
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| 137 | ss.ss_flags = 0; |
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| 138 | if ( sigaltstack( &ss, 0p ) == -1 ) { |
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| 139 | abort( "__cfaabi_interpose_startup : internal error, sigaltstack error(%d) %s.", errno, strerror( errno ) ); |
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| 140 | } // if |
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| 141 | |
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[de94a60] | 142 | // Failure handler |
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[92bfda0] | 143 | // internal errors |
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| 144 | __cfaabi_sigaction( SIGSEGV, sigHandler_segv, SA_SIGINFO | SA_ONSTACK ); // Invalid memory reference (default: Core) |
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| 145 | __cfaabi_sigaction( SIGBUS , sigHandler_segv, SA_SIGINFO | SA_ONSTACK ); // Bus error, bad memory access (default: Core) |
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| 146 | __cfaabi_sigaction( SIGILL , sigHandler_ill , SA_SIGINFO | SA_ONSTACK ); // Illegal Instruction (default: Core) |
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| 147 | __cfaabi_sigaction( SIGFPE , sigHandler_fpe , SA_SIGINFO | SA_ONSTACK ); // Floating-point exception (default: Core) |
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| 148 | |
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| 149 | // handlers to outside errors |
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| 150 | // reset in-case they insist and send it over and over |
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| 151 | __cfaabi_sigaction( SIGTERM, sigHandler_term, SA_SIGINFO | SA_ONSTACK | SA_RESETHAND ); // Termination signal (default: Term) |
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| 152 | __cfaabi_sigaction( SIGINT , sigHandler_term, SA_SIGINFO | SA_ONSTACK | SA_RESETHAND ); // Interrupt from keyboard (default: Term) |
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| 153 | __cfaabi_sigaction( SIGHUP , sigHandler_term, SA_SIGINFO | SA_ONSTACK | SA_RESETHAND ); // Hangup detected on controlling terminal or death of controlling process (default: Term) |
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| 154 | __cfaabi_sigaction( SIGQUIT, sigHandler_term, SA_SIGINFO | SA_ONSTACK | SA_RESETHAND ); // Quit from keyboard (default: Core) |
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| 155 | __cfaabi_sigaction( SIGABRT, sigHandler_term, SA_SIGINFO | SA_ONSTACK | SA_RESETHAND ); // Abort signal from abort(3) (default: Core) |
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[6bfe5cc] | 156 | } |
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[9d944b2] | 157 | } |
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| 158 | |
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[e0cc9e0] | 159 | extern "C" int dl_iterate_phdr( int (* callback)( struct dl_phdr_info *, size_t, void * ), void * data ) { |
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| 160 | disable_interrupts(); |
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[7db39f7] | 161 | int ret = __cabi_libc.dl_iterate_phdr( callback, data ); // call real routine |
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[e0cc9e0] | 162 | enable_interrupts( false ); |
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| 163 | return ret; |
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| 164 | } // dl_iterate_phdr |
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| 165 | |
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[dbe9b08] | 166 | //============================================================================================= |
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| 167 | // Terminating Signals logic |
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| 168 | //============================================================================================= |
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| 169 | |
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[3d5f2ef1] | 170 | // Forward declare abort after the __typeof__ call to avoid ambiguities |
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[032234bd] | 171 | libcfa_public void exit( int status, const char fmt[], ... ) __attribute__(( format(printf, 2, 3), __nothrow__, __leaf__, __noreturn__ )); |
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| 172 | libcfa_public void abort( const char fmt[], ... ) __attribute__(( format(printf, 1, 2), __nothrow__, __leaf__, __noreturn__ )); |
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| 173 | libcfa_public void abort( bool signalAbort, const char fmt[], ... ) __attribute__(( format(printf, 2, 3), __nothrow__, __leaf__, __noreturn__ )); |
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| 174 | libcfa_public void __abort( bool signalAbort, const char fmt[], va_list args ) __attribute__(( __nothrow__, __leaf__, __noreturn__ )); |
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[3d5f2ef1] | 175 | |
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[9d944b2] | 176 | extern "C" { |
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[032234bd] | 177 | libcfa_public void abort( void ) __attribute__(( __nothrow__, __leaf__, __noreturn__ )) { |
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[1d94116] | 178 | abort( false, "%s", "" ); |
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[9d944b2] | 179 | } |
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| 180 | |
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[032234bd] | 181 | libcfa_public void __cabi_abort( const char fmt[], ... ) __attribute__(( format(printf, 1, 2), __nothrow__, __leaf__, __noreturn__ )) { |
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[3d5f2ef1] | 182 | va_list argp; |
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| 183 | va_start( argp, fmt ); |
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[d870df3] | 184 | __abort( false, fmt, argp ); |
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[3d5f2ef1] | 185 | va_end( argp ); |
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[9d944b2] | 186 | } |
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| 187 | |
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[032234bd] | 188 | libcfa_public void exit( int status ) __attribute__(( __nothrow__, __leaf__, __noreturn__ )) { |
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[169d944] | 189 | __cabi_libc.exit( status ); |
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[3d5f2ef1] | 190 | } |
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[9d944b2] | 191 | } |
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| 192 | |
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[92bfda0] | 193 | // See concurrency/kernel.cfa and concurrency/preemption.cfa for strong definition used in multi-processor mode. |
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| 194 | void __kernel_abort_lock( void ) __attribute__(( __nothrow__, __leaf__, __weak__ )) {} |
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| 195 | void __kernel_abort_msg( char buffer[], int size ) __attribute__(( __nothrow__, __leaf__, __weak__ )) {} |
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| 196 | int __kernel_abort_lastframe( void ) __attribute__(( __nothrow__, __leaf__, __weak__ )) { return 4; } |
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[9d944b2] | 197 | |
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| 198 | enum { abort_text_size = 1024 }; |
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| 199 | static char abort_text[ abort_text_size ]; |
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| 200 | |
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[8a13c47] | 201 | static void __cfaabi_backtrace( int start ) { |
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[74330e7] | 202 | enum { Frames = 50, }; // maximum number of stack frames |
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[92bfda0] | 203 | int last = __kernel_abort_lastframe(); // skip last N stack frames |
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[dbe9b08] | 204 | |
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| 205 | void * array[Frames]; |
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[6bfe5cc] | 206 | size_t size = backtrace( array, Frames ); |
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[74330e7] | 207 | char ** messages = backtrace_symbols( array, size ); // does not demangle names |
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[dbe9b08] | 208 | |
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[8a13c47] | 209 | *index( messages[0], '(' ) = '\0'; // find executable name |
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[1c40091] | 210 | __cfaabi_bits_print_nolock( STDERR_FILENO, "Stack back trace for: %s\n", messages[0]); |
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[dbe9b08] | 211 | |
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[8a13c47] | 212 | for ( unsigned int i = start; i < size - last && messages != 0p; i += 1 ) { |
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[524627e] | 213 | char * name = 0p, * offset_begin = 0p, * offset_end = 0p; |
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[dbe9b08] | 214 | |
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[74330e7] | 215 | for ( char * p = messages[i]; *p; p += 1 ) { // find parantheses and +offset |
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[1c40091] | 216 | //__cfaabi_bits_print_nolock( "X %s\n", p); |
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[dbe9b08] | 217 | if ( *p == '(' ) { |
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| 218 | name = p; |
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[4f37255] | 219 | } else if ( *p == '+' ) { |
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[dbe9b08] | 220 | offset_begin = p; |
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[4f37255] | 221 | } else if ( *p == ')' ) { |
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[dbe9b08] | 222 | offset_end = p; |
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| 223 | break; |
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| 224 | } |
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| 225 | } |
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| 226 | |
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[8a13c47] | 227 | // if line contains symbol, print it |
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| 228 | int frameNo = i - start; |
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[dbe9b08] | 229 | if ( name && offset_begin && offset_end && name < offset_begin ) { |
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[8a13c47] | 230 | *name++ = '\0'; // delimit strings |
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[dbe9b08] | 231 | *offset_begin++ = '\0'; |
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| 232 | *offset_end++ = '\0'; |
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| 233 | |
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[1c40091] | 234 | __cfaabi_bits_print_nolock( STDERR_FILENO, "(%i) %s : %s + %s %s\n", frameNo, messages[i], name, offset_begin, offset_end); |
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[4f37255] | 235 | } else { // otherwise, print the whole line |
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[1c40091] | 236 | __cfaabi_bits_print_nolock( STDERR_FILENO, "(%i) %s\n", frameNo, messages[i] ); |
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[dbe9b08] | 237 | } |
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| 238 | } |
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| 239 | free( messages ); |
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| 240 | } |
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| 241 | |
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[8a13c47] | 242 | void exit( int status, const char fmt[], ... ) { |
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| 243 | va_list args; |
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| 244 | va_start( args, fmt ); |
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| 245 | vfprintf( stderr, fmt, args ); |
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| 246 | va_end( args ); |
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| 247 | __cabi_libc.exit( status ); |
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| 248 | } |
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| 249 | |
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[92bfda0] | 250 | static volatile bool __abort_first = 0; |
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[6011658] | 251 | |
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[d870df3] | 252 | // Cannot forward va_list. |
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| 253 | void __abort( bool signalAbort, const char fmt[], va_list args ) { |
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[92bfda0] | 254 | // Multiple threads can come here from multiple paths |
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| 255 | // To make sure this is safe any concurrent/subsequent call to abort is redirected to libc-abort |
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| 256 | bool first = ! __atomic_test_and_set( &__abort_first, __ATOMIC_SEQ_CST); |
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[8a13c47] | 257 | |
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[92bfda0] | 258 | // Prevent preemption from kicking-in and messing with the abort |
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| 259 | __kernel_abort_lock(); |
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[8a13c47] | 260 | |
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[92bfda0] | 261 | // first to abort ? |
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| 262 | if ( !first ) { |
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| 263 | // We aren't the first to abort just let C handle it |
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| 264 | signal( SIGABRT, SIG_DFL ); // restore default in case we came here through the function. |
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| 265 | __cabi_libc.abort(); |
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| 266 | } |
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[8a13c47] | 267 | |
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[92bfda0] | 268 | int len = snprintf( abort_text, abort_text_size, "Cforall Runtime error (UNIX pid:%ld) ", (long int)getpid() ); // use UNIX pid (versus getPid) |
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| 269 | __cfaabi_bits_write( STDERR_FILENO, abort_text, len ); |
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[8a13c47] | 270 | |
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[92bfda0] | 271 | // print the cause of the error |
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| 272 | assert( fmt ); |
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| 273 | len = vsnprintf( abort_text, abort_text_size, fmt, args ); |
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| 274 | __cfaabi_bits_write( STDERR_FILENO, abort_text, len ); |
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[6011658] | 275 | |
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[92bfda0] | 276 | // add optional newline if missing at the end of the format text |
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| 277 | if ( fmt[strlen( fmt ) - 1] != '\n' ) { |
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| 278 | __cfaabi_bits_write( STDERR_FILENO, "\n", 1 ); |
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| 279 | } // if |
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[6011658] | 280 | |
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[92bfda0] | 281 | // Give the kernel the chance to add some data in here |
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| 282 | __kernel_abort_msg( abort_text, abort_text_size ); |
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[6011658] | 283 | |
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[92bfda0] | 284 | // print stack trace in handler |
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| 285 | __cfaabi_backtrace( signalAbort ? 4 : 2 ); |
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[6011658] | 286 | |
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[92bfda0] | 287 | // Finally call abort |
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| 288 | __cabi_libc.abort(); |
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[5ccee64] | 289 | |
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[8a13c47] | 290 | } |
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| 291 | |
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| 292 | void abort( const char fmt[], ... ) { |
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| 293 | va_list args; |
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| 294 | va_start( args, fmt ); |
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[d870df3] | 295 | __abort( false, fmt, args ); |
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[f883ef1] | 296 | // CONTROL NEVER REACHES HERE! |
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[8a13c47] | 297 | va_end( args ); |
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| 298 | } |
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| 299 | |
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[d870df3] | 300 | void abort( bool signalAbort, const char fmt[], ... ) { |
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[f883ef1] | 301 | va_list args; |
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| 302 | va_start( args, fmt ); |
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| 303 | __abort( signalAbort, fmt, args ); |
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| 304 | // CONTROL NEVER REACHES HERE! |
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| 305 | va_end( args ); |
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[d870df3] | 306 | } |
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| 307 | |
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[dbe9b08] | 308 | void sigHandler_segv( __CFA_SIGPARMS__ ) { |
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[8a13c47] | 309 | if ( sfp->si_addr == 0p ) { |
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| 310 | abort( true, "Null pointer (0p) dereference.\n" ); |
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[1469a8a] | 311 | } else { |
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[8a13c47] | 312 | abort( true, "%s at memory location %p.\n" |
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[1469a8a] | 313 | "Possible cause is reading outside the address space or writing to a protected area within the address space with an invalid pointer or subscript.\n", |
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| 314 | (sig == SIGSEGV ? "Segment fault" : "Bus error"), sfp->si_addr ); |
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| 315 | } |
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[2b8bc41] | 316 | } |
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| 317 | |
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| 318 | void sigHandler_ill( __CFA_SIGPARMS__ ) { |
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[8a13c47] | 319 | abort( true, "Executing illegal instruction at location %p.\n" |
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[2b8bc41] | 320 | "Possible cause is stack corruption.\n", |
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| 321 | sfp->si_addr ); |
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| 322 | } |
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| 323 | |
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| 324 | void sigHandler_fpe( __CFA_SIGPARMS__ ) { |
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| 325 | const char * msg; |
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| 326 | |
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[a424315d] | 327 | choose( sfp->si_code ) { |
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| 328 | case FPE_INTDIV, FPE_FLTDIV: msg = "divide by zero"; |
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| 329 | case FPE_FLTOVF: msg = "overflow"; |
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| 330 | case FPE_FLTUND: msg = "underflow"; |
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| 331 | case FPE_FLTRES: msg = "inexact result"; |
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| 332 | case FPE_FLTINV: msg = "invalid operation"; |
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[2b8bc41] | 333 | default: msg = "unknown"; |
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[a424315d] | 334 | } // choose |
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[8a13c47] | 335 | abort( true, "Computation error %s at location %p.\n", msg, sfp->si_addr ); |
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[dbe9b08] | 336 | } |
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| 337 | |
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[94dea96] | 338 | void sigHandler_term( __CFA_SIGPARMS__ ) { |
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[8a13c47] | 339 | abort( true, "Application interrupted by signal: %s.\n", strsignal( sig ) ); |
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[94dea96] | 340 | } |
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| 341 | |
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[6b0b624] | 342 | // Local Variables: // |
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| 343 | // mode: c // |
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| 344 | // tab-width: 4 // |
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| 345 | // End: // |
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