[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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[6791213] | 12 | // Last Modified On : Fri Mar 13 17:35:37 2020 |
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| 13 | // Update Count : 178 |
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[9d944b2] | 14 | // |
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| 15 | |
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[7867eb9] | 16 | #include <stdarg.h> // va_start, va_end |
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[851fd92] | 17 | #include <stdio.h> |
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[7867eb9] | 18 | #include <string.h> // strlen |
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| 19 | #include <unistd.h> // _exit, getpid |
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[dbe9b08] | 20 | #define __USE_GNU |
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[58b6d1b] | 21 | #include <signal.h> |
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[dbe9b08] | 22 | #undef __USE_GNU |
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[67db067] | 23 | extern "C" { |
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[7867eb9] | 24 | #include <dlfcn.h> // dlopen, dlsym |
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| 25 | #include <execinfo.h> // backtrace, messages |
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[9d944b2] | 26 | } |
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| 27 | |
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[73abe95] | 28 | #include "bits/debug.hfa" |
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| 29 | #include "bits/defs.hfa" |
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| 30 | #include "bits/signal.hfa" // sigHandler_? |
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| 31 | #include "startup.hfa" // STARTUP_PRIORITY_CORE |
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[1d94116] | 32 | #include <assert.h> |
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[9d944b2] | 33 | |
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[3d5f2ef1] | 34 | //============================================================================================= |
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| 35 | // Interposing helpers |
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| 36 | //============================================================================================= |
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| 37 | |
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[032234bd] | 38 | static void preload_libgcc(void) { |
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[ad64520] | 39 | dlopen( "libgcc_s.so.1", RTLD_NOW ); |
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| 40 | if ( const char * error = dlerror() ) abort( "interpose_symbol : internal error pre-loading libgcc, %s\n", error ); |
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| 41 | } |
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| 42 | |
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[67db067] | 43 | typedef void (* generic_fptr_t)(void); |
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[032234bd] | 44 | static generic_fptr_t interpose_symbol( const char symbol[], const char version[] ) { |
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[9d944b2] | 45 | const char * error; |
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| 46 | |
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| 47 | static void * library; |
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| 48 | if ( ! library ) { |
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| 49 | #if defined( RTLD_NEXT ) |
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| 50 | library = RTLD_NEXT; |
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| 51 | #else |
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| 52 | // missing RTLD_NEXT => must hard-code library name, assuming libstdc++ |
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| 53 | library = dlopen( "libc.so.6", RTLD_LAZY ); |
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| 54 | error = dlerror(); |
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| 55 | if ( error ) { |
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[169d944] | 56 | abort( "interpose_symbol : failed to open libc, %s\n", error ); |
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[9d944b2] | 57 | } |
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| 58 | #endif |
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| 59 | } // if |
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| 60 | |
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[67db067] | 61 | union { generic_fptr_t fptr; void * ptr; } originalFunc; |
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[aca65621] | 62 | |
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[9d944b2] | 63 | #if defined( _GNU_SOURCE ) |
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| 64 | if ( version ) { |
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| 65 | originalFunc.ptr = dlvsym( library, symbol, version ); |
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| 66 | } else { |
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| 67 | originalFunc.ptr = dlsym( library, symbol ); |
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| 68 | } |
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| 69 | #else |
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| 70 | originalFunc.ptr = dlsym( library, symbol ); |
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| 71 | #endif // _GNU_SOURCE |
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[aca65621] | 72 | |
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[9d944b2] | 73 | error = dlerror(); |
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[169d944] | 74 | if ( error ) abort( "interpose_symbol : internal error, %s\n", error ); |
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[9d944b2] | 75 | |
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| 76 | return originalFunc.fptr; |
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| 77 | } |
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| 78 | |
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[67db067] | 79 | #define INTERPOSE_LIBC( x, ver ) __cabi_libc.x = (typeof(__cabi_libc.x))interpose_symbol( #x, ver ) |
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[3d5f2ef1] | 80 | |
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| 81 | //============================================================================================= |
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[67db067] | 82 | // Interposition Startup logic |
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[3d5f2ef1] | 83 | //============================================================================================= |
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[9d944b2] | 84 | |
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[032234bd] | 85 | static void sigHandler_segv( __CFA_SIGPARMS__ ); |
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| 86 | static void sigHandler_ill ( __CFA_SIGPARMS__ ); |
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| 87 | static void sigHandler_fpe ( __CFA_SIGPARMS__ ); |
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| 88 | static void sigHandler_abrt( __CFA_SIGPARMS__ ); |
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| 89 | static void sigHandler_term( __CFA_SIGPARMS__ ); |
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[dbe9b08] | 90 | |
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[032234bd] | 91 | static struct { |
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[d7312ac] | 92 | void (* exit)( int ) __attribute__(( __noreturn__ )); |
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| 93 | void (* abort)( void ) __attribute__(( __noreturn__ )); |
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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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| 99 | void __cfaabi_interpose_startup( void ) { |
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[8a13c47] | 100 | const char *version = 0p; |
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[7dd98b6] | 101 | cfa_main_returned = 0; |
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[9d944b2] | 102 | |
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[ad64520] | 103 | preload_libgcc(); |
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| 104 | |
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[d7312ac] | 105 | #pragma GCC diagnostic push |
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| 106 | #pragma GCC diagnostic ignored "-Wdiscarded-qualifiers" |
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[3d5f2ef1] | 107 | INTERPOSE_LIBC( abort, version ); |
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| 108 | INTERPOSE_LIBC( exit , version ); |
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[d7312ac] | 109 | #pragma GCC diagnostic pop |
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[dbe9b08] | 110 | |
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[8a13c47] | 111 | // As a precaution (and necessity), errors that result in termination are delivered on a separate stack because |
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| 112 | // task stacks might be very small (4K) and the signal delivery corrupts memory to the point that a clean |
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| 113 | // shutdown is impossible. Also, when a stack overflow encounters the non-accessible sentinel page (debug only) |
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| 114 | // and generates a segment fault, the signal cannot be delivered on the sentinel page. Finally, calls to abort |
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| 115 | // print a stack trace that uses substantial stack space. |
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| 116 | |
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| 117 | #define MINSTKSZ SIGSTKSZ * 8 |
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| 118 | static char stack[MINSTKSZ] __attribute__(( aligned (16) )); |
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| 119 | static stack_t ss; |
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| 120 | |
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| 121 | ss.ss_sp = stack; |
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| 122 | ss.ss_size = MINSTKSZ; |
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| 123 | ss.ss_flags = 0; |
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| 124 | if ( sigaltstack( &ss, 0p ) == -1 ) { |
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| 125 | abort( "__cfaabi_interpose_startup : internal error, sigaltstack error(%d) %s.", errno, strerror( errno ) ); |
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| 126 | } // if |
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| 127 | |
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[de94a60] | 128 | // Failure handler |
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[92bfda0] | 129 | // internal errors |
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| 130 | __cfaabi_sigaction( SIGSEGV, sigHandler_segv, SA_SIGINFO | SA_ONSTACK ); // Invalid memory reference (default: Core) |
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| 131 | __cfaabi_sigaction( SIGBUS , sigHandler_segv, SA_SIGINFO | SA_ONSTACK ); // Bus error, bad memory access (default: Core) |
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| 132 | __cfaabi_sigaction( SIGILL , sigHandler_ill , SA_SIGINFO | SA_ONSTACK ); // Illegal Instruction (default: Core) |
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| 133 | __cfaabi_sigaction( SIGFPE , sigHandler_fpe , SA_SIGINFO | SA_ONSTACK ); // Floating-point exception (default: Core) |
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| 134 | |
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| 135 | // handlers to outside errors |
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| 136 | // reset in-case they insist and send it over and over |
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| 137 | __cfaabi_sigaction( SIGTERM, sigHandler_term, SA_SIGINFO | SA_ONSTACK | SA_RESETHAND ); // Termination signal (default: Term) |
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| 138 | __cfaabi_sigaction( SIGINT , sigHandler_term, SA_SIGINFO | SA_ONSTACK | SA_RESETHAND ); // Interrupt from keyboard (default: Term) |
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| 139 | __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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| 140 | __cfaabi_sigaction( SIGQUIT, sigHandler_term, SA_SIGINFO | SA_ONSTACK | SA_RESETHAND ); // Quit from keyboard (default: Core) |
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| 141 | __cfaabi_sigaction( SIGABRT, sigHandler_term, SA_SIGINFO | SA_ONSTACK | SA_RESETHAND ); // Abort signal from abort(3) (default: Core) |
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[6bfe5cc] | 142 | } |
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[9d944b2] | 143 | } |
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| 144 | |
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[dbe9b08] | 145 | //============================================================================================= |
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| 146 | // Terminating Signals logic |
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| 147 | //============================================================================================= |
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| 148 | |
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[3d5f2ef1] | 149 | // Forward declare abort after the __typeof__ call to avoid ambiguities |
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[032234bd] | 150 | libcfa_public void exit( int status, const char fmt[], ... ) __attribute__(( format(printf, 2, 3), __nothrow__, __leaf__, __noreturn__ )); |
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| 151 | libcfa_public void abort( const char fmt[], ... ) __attribute__(( format(printf, 1, 2), __nothrow__, __leaf__, __noreturn__ )); |
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| 152 | libcfa_public void abort( bool signalAbort, const char fmt[], ... ) __attribute__(( format(printf, 2, 3), __nothrow__, __leaf__, __noreturn__ )); |
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| 153 | libcfa_public void __abort( bool signalAbort, const char fmt[], va_list args ) __attribute__(( __nothrow__, __leaf__, __noreturn__ )); |
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[3d5f2ef1] | 154 | |
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[9d944b2] | 155 | extern "C" { |
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[032234bd] | 156 | libcfa_public void abort( void ) __attribute__(( __nothrow__, __leaf__, __noreturn__ )) { |
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[1d94116] | 157 | abort( false, "%s", "" ); |
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[9d944b2] | 158 | } |
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| 159 | |
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[032234bd] | 160 | libcfa_public void __cabi_abort( const char fmt[], ... ) __attribute__(( format(printf, 1, 2), __nothrow__, __leaf__, __noreturn__ )) { |
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[3d5f2ef1] | 161 | va_list argp; |
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| 162 | va_start( argp, fmt ); |
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[d870df3] | 163 | __abort( false, fmt, argp ); |
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[3d5f2ef1] | 164 | va_end( argp ); |
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[9d944b2] | 165 | } |
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| 166 | |
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[032234bd] | 167 | libcfa_public void exit( int status ) __attribute__(( __nothrow__, __leaf__, __noreturn__ )) { |
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[169d944] | 168 | __cabi_libc.exit( status ); |
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[3d5f2ef1] | 169 | } |
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[9d944b2] | 170 | } |
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| 171 | |
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[92bfda0] | 172 | // See concurrency/kernel.cfa and concurrency/preemption.cfa for strong definition used in multi-processor mode. |
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| 173 | void __kernel_abort_lock( void ) __attribute__(( __nothrow__, __leaf__, __weak__ )) {} |
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| 174 | void __kernel_abort_msg( char buffer[], int size ) __attribute__(( __nothrow__, __leaf__, __weak__ )) {} |
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| 175 | int __kernel_abort_lastframe( void ) __attribute__(( __nothrow__, __leaf__, __weak__ )) { return 4; } |
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[9d944b2] | 176 | |
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| 177 | enum { abort_text_size = 1024 }; |
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| 178 | static char abort_text[ abort_text_size ]; |
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| 179 | |
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[8a13c47] | 180 | static void __cfaabi_backtrace( int start ) { |
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[74330e7] | 181 | enum { Frames = 50, }; // maximum number of stack frames |
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[92bfda0] | 182 | int last = __kernel_abort_lastframe(); // skip last N stack frames |
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[dbe9b08] | 183 | |
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| 184 | void * array[Frames]; |
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[6bfe5cc] | 185 | size_t size = backtrace( array, Frames ); |
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[74330e7] | 186 | char ** messages = backtrace_symbols( array, size ); // does not demangle names |
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[dbe9b08] | 187 | |
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[8a13c47] | 188 | *index( messages[0], '(' ) = '\0'; // find executable name |
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[1c40091] | 189 | __cfaabi_bits_print_nolock( STDERR_FILENO, "Stack back trace for: %s\n", messages[0]); |
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[dbe9b08] | 190 | |
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[8a13c47] | 191 | for ( unsigned int i = start; i < size - last && messages != 0p; i += 1 ) { |
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[524627e] | 192 | char * name = 0p, * offset_begin = 0p, * offset_end = 0p; |
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[dbe9b08] | 193 | |
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[74330e7] | 194 | for ( char * p = messages[i]; *p; p += 1 ) { // find parantheses and +offset |
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[1c40091] | 195 | //__cfaabi_bits_print_nolock( "X %s\n", p); |
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[dbe9b08] | 196 | if ( *p == '(' ) { |
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| 197 | name = p; |
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[4f37255] | 198 | } else if ( *p == '+' ) { |
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[dbe9b08] | 199 | offset_begin = p; |
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[4f37255] | 200 | } else if ( *p == ')' ) { |
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[dbe9b08] | 201 | offset_end = p; |
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| 202 | break; |
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| 203 | } |
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| 204 | } |
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| 205 | |
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[8a13c47] | 206 | // if line contains symbol, print it |
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| 207 | int frameNo = i - start; |
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[dbe9b08] | 208 | if ( name && offset_begin && offset_end && name < offset_begin ) { |
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[8a13c47] | 209 | *name++ = '\0'; // delimit strings |
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[dbe9b08] | 210 | *offset_begin++ = '\0'; |
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| 211 | *offset_end++ = '\0'; |
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| 212 | |
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[1c40091] | 213 | __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] | 214 | } else { // otherwise, print the whole line |
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[1c40091] | 215 | __cfaabi_bits_print_nolock( STDERR_FILENO, "(%i) %s\n", frameNo, messages[i] ); |
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[dbe9b08] | 216 | } |
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| 217 | } |
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| 218 | free( messages ); |
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| 219 | } |
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| 220 | |
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[8a13c47] | 221 | void exit( int status, const char fmt[], ... ) { |
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| 222 | va_list args; |
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| 223 | va_start( args, fmt ); |
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| 224 | vfprintf( stderr, fmt, args ); |
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| 225 | va_end( args ); |
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| 226 | __cabi_libc.exit( status ); |
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| 227 | } |
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| 228 | |
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[92bfda0] | 229 | static volatile bool __abort_first = 0; |
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[6011658] | 230 | |
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[d870df3] | 231 | // Cannot forward va_list. |
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| 232 | void __abort( bool signalAbort, const char fmt[], va_list args ) { |
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[92bfda0] | 233 | // Multiple threads can come here from multiple paths |
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| 234 | // To make sure this is safe any concurrent/subsequent call to abort is redirected to libc-abort |
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| 235 | bool first = ! __atomic_test_and_set( &__abort_first, __ATOMIC_SEQ_CST); |
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[8a13c47] | 236 | |
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[92bfda0] | 237 | // Prevent preemption from kicking-in and messing with the abort |
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| 238 | __kernel_abort_lock(); |
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[8a13c47] | 239 | |
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[92bfda0] | 240 | // first to abort ? |
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| 241 | if ( !first ) { |
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| 242 | // We aren't the first to abort just let C handle it |
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| 243 | signal( SIGABRT, SIG_DFL ); // restore default in case we came here through the function. |
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| 244 | __cabi_libc.abort(); |
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| 245 | } |
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[8a13c47] | 246 | |
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[92bfda0] | 247 | 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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| 248 | __cfaabi_bits_write( STDERR_FILENO, abort_text, len ); |
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[8a13c47] | 249 | |
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[92bfda0] | 250 | // print the cause of the error |
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| 251 | assert( fmt ); |
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| 252 | len = vsnprintf( abort_text, abort_text_size, fmt, args ); |
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| 253 | __cfaabi_bits_write( STDERR_FILENO, abort_text, len ); |
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[6011658] | 254 | |
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[92bfda0] | 255 | // add optional newline if missing at the end of the format text |
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| 256 | if ( fmt[strlen( fmt ) - 1] != '\n' ) { |
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| 257 | __cfaabi_bits_write( STDERR_FILENO, "\n", 1 ); |
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| 258 | } // if |
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[6011658] | 259 | |
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[92bfda0] | 260 | // Give the kernel the chance to add some data in here |
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| 261 | __kernel_abort_msg( abort_text, abort_text_size ); |
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[6011658] | 262 | |
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[92bfda0] | 263 | // print stack trace in handler |
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| 264 | __cfaabi_backtrace( signalAbort ? 4 : 2 ); |
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[6011658] | 265 | |
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[92bfda0] | 266 | // Finally call abort |
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| 267 | __cabi_libc.abort(); |
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[5ccee64] | 268 | |
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[8a13c47] | 269 | } |
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| 270 | |
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| 271 | void abort( const char fmt[], ... ) { |
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| 272 | va_list args; |
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| 273 | va_start( args, fmt ); |
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[d870df3] | 274 | __abort( false, fmt, args ); |
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| 275 | // CONTROL NEVER REACHES HERE! |
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[8a13c47] | 276 | va_end( args ); |
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| 277 | } |
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| 278 | |
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[d870df3] | 279 | void abort( bool signalAbort, const char fmt[], ... ) { |
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| 280 | va_list args; |
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| 281 | va_start( args, fmt ); |
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| 282 | __abort( signalAbort, fmt, args ); |
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| 283 | // CONTROL NEVER REACHES HERE! |
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| 284 | va_end( args ); |
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| 285 | } |
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| 286 | |
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[dbe9b08] | 287 | void sigHandler_segv( __CFA_SIGPARMS__ ) { |
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[8a13c47] | 288 | if ( sfp->si_addr == 0p ) { |
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| 289 | abort( true, "Null pointer (0p) dereference.\n" ); |
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[1469a8a] | 290 | } else { |
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[8a13c47] | 291 | abort( true, "%s at memory location %p.\n" |
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[1469a8a] | 292 | "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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| 293 | (sig == SIGSEGV ? "Segment fault" : "Bus error"), sfp->si_addr ); |
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| 294 | } |
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[2b8bc41] | 295 | } |
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| 296 | |
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| 297 | void sigHandler_ill( __CFA_SIGPARMS__ ) { |
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[8a13c47] | 298 | abort( true, "Executing illegal instruction at location %p.\n" |
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[2b8bc41] | 299 | "Possible cause is stack corruption.\n", |
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| 300 | sfp->si_addr ); |
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| 301 | } |
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| 302 | |
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| 303 | void sigHandler_fpe( __CFA_SIGPARMS__ ) { |
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| 304 | const char * msg; |
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| 305 | |
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[a424315d] | 306 | choose( sfp->si_code ) { |
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| 307 | case FPE_INTDIV, FPE_FLTDIV: msg = "divide by zero"; |
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| 308 | case FPE_FLTOVF: msg = "overflow"; |
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| 309 | case FPE_FLTUND: msg = "underflow"; |
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| 310 | case FPE_FLTRES: msg = "inexact result"; |
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| 311 | case FPE_FLTINV: msg = "invalid operation"; |
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[2b8bc41] | 312 | default: msg = "unknown"; |
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[a424315d] | 313 | } // choose |
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[8a13c47] | 314 | abort( true, "Computation error %s at location %p.\n", msg, sfp->si_addr ); |
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[dbe9b08] | 315 | } |
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| 316 | |
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[94dea96] | 317 | void sigHandler_term( __CFA_SIGPARMS__ ) { |
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[8a13c47] | 318 | abort( true, "Application interrupted by signal: %s.\n", strsignal( sig ) ); |
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[94dea96] | 319 | } |
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| 320 | |
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[6b0b624] | 321 | // Local Variables: // |
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| 322 | // mode: c // |
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| 323 | // tab-width: 4 // |
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| 324 | // End: // |
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