source: src/libcfa/interpose.c@ 4ea632e

ADT aaron-thesis arm-eh ast-experimental cleanup-dtors deferred_resn demangler enum forall-pointer-decay jacob/cs343-translation jenkins-sandbox new-ast new-ast-unique-expr new-env no_list persistent-indexer pthread-emulation qualifiedEnum with_gc
Last change on this file since 4ea632e was 94dea96, checked in by Peter A. Buhr <pabuhr@…>, 7 years ago

add run-time signal-handlers for SIGTERM and SIGINT
  • Property mode set to 100644
File size: 8.5 KB
Line 
1//
2// Cforall Version 1.0.0 Copyright (C) 2016 University of Waterloo
3//
4// The contents of this file are covered under the licence agreement in the
5// file "LICENCE" distributed with Cforall.
6//
7// interpose.c --
8//
9// Author : Thierry Delisle
10// Created On : Wed Mar 29 16:10:31 2017
11// Last Modified By : Peter A. Buhr
12// Last Modified On : Tue May 1 15:05:35 2018
13// Update Count : 83
14//
15
16#include <stdarg.h>
17#include <stddef.h>
18
19extern "C" {
20#include <stdio.h>
21#include <string.h>
22#include <dlfcn.h>
23#include <unistd.h>
24#define __USE_GNU
25#include <signal.h>
26#undef __USE_GNU
27#include <execinfo.h>
28}
29
30#include "bits/debug.h"
31#include "bits/defs.h"
32#include "bits/signal.h"
33#include "startup.h"
34
35//=============================================================================================
36// Interposing helpers
37//=============================================================================================
38
39typedef void (*generic_fptr_t)(void);
40generic_fptr_t interpose_symbol( const char* symbol, const char *version ) {
41 const char * error;
42
43 static void * library;
44 if ( ! library ) {
45 #if defined( RTLD_NEXT )
46 library = RTLD_NEXT;
47 #else
48 // missing RTLD_NEXT => must hard-code library name, assuming libstdc++
49 library = dlopen( "libc.so.6", RTLD_LAZY );
50 error = dlerror();
51 if ( error ) {
52 abort( "interpose_symbol : failed to open libc, %s\n", error );
53 }
54 #endif
55 } // if
56
57 union { generic_fptr_t fptr; void* ptr; } originalFunc;
58
59 #if defined( _GNU_SOURCE )
60 if ( version ) {
61 originalFunc.ptr = dlvsym( library, symbol, version );
62 } else {
63 originalFunc.ptr = dlsym( library, symbol );
64 }
65 #else
66 originalFunc.ptr = dlsym( library, symbol );
67 #endif // _GNU_SOURCE
68
69 error = dlerror();
70 if ( error ) abort( "interpose_symbol : internal error, %s\n", error );
71
72 return originalFunc.fptr;
73}
74
75forall(dtype T)
76static inline void ptr_from_symbol( T** symbol_ptr, const char * symbol_name, const char * version) {
77 union {
78 generic_fptr_t gp;
79 T* tp;
80 } u;
81
82 u.gp = interpose_symbol( symbol_name, version );
83
84 *symbol_ptr = u.tp;
85}
86
87#define INTERPOSE_LIBC( x, ver ) ptr_from_symbol( (void**)&__cabi_libc.x, #x, ver)
88
89//=============================================================================================
90// Terminating Signals logic
91//=============================================================================================
92
93void sigHandler_segv ( __CFA_SIGPARMS__ );
94void sigHandler_ill ( __CFA_SIGPARMS__ );
95void sigHandler_fpe ( __CFA_SIGPARMS__ );
96void sigHandler_abort( __CFA_SIGPARMS__ );
97void sigHandler_term ( __CFA_SIGPARMS__ );
98
99struct {
100 void (* exit)( int ) __attribute__ (( __noreturn__ ));
101 void (* abort)( void ) __attribute__ (( __noreturn__ ));
102} __cabi_libc;
103
104extern "C" {
105 void __cfaabi_interpose_startup(void) __attribute__(( constructor( STARTUP_PRIORITY_CORE ) ));
106 void __cfaabi_interpose_startup( void ) {
107 const char *version = NULL;
108
109 INTERPOSE_LIBC( abort, version );
110 INTERPOSE_LIBC( exit , version );
111
112 __cfaabi_sigaction( SIGSEGV, sigHandler_segv , SA_SIGINFO ); // Failure handler
113 __cfaabi_sigaction( SIGBUS , sigHandler_segv , SA_SIGINFO ); // Failure handler
114 __cfaabi_sigaction( SIGILL , sigHandler_ill , SA_SIGINFO ); // Failure handler
115 __cfaabi_sigaction( SIGFPE , sigHandler_fpe , SA_SIGINFO ); // Failure handler
116 __cfaabi_sigaction( SIGABRT, sigHandler_abort, SA_SIGINFO ); // Failure handler
117 __cfaabi_sigaction( SIGTERM, sigHandler_term , SA_SIGINFO ); // Failure handler
118 __cfaabi_sigaction( SIGINT , sigHandler_term , SA_SIGINFO ); // Failure handler
119 }
120}
121
122//=============================================================================================
123// Terminating Signals logic
124//=============================================================================================
125
126// Forward declare abort after the __typeof__ call to avoid ambiguities
127void exit( int status, const char fmt[], ... ) __attribute__ (( format(printf, 2, 3), __nothrow__, __leaf__, __noreturn__ ));
128void abort( const char fmt[], ... ) __attribute__ (( format(printf, 1, 2), __nothrow__, __leaf__, __noreturn__ ));
129
130extern "C" {
131 void abort( void ) __attribute__ (( __nothrow__, __leaf__, __noreturn__ )) {
132 abort( NULL );
133 }
134
135 void __cabi_abort( const char fmt[], ... ) __attribute__ (( format(printf, 1, 2), __nothrow__, __leaf__, __noreturn__ )) {
136 va_list argp;
137 va_start( argp, fmt );
138 abort( fmt, argp );
139 va_end( argp );
140 }
141
142 void exit( int status ) __attribute__ (( __nothrow__, __leaf__, __noreturn__ )) {
143 __cabi_libc.exit( status );
144 }
145}
146
147void * kernel_abort ( void ) __attribute__ (( __nothrow__, __leaf__, __weak__ )) { return NULL; }
148void kernel_abort_msg( void * data, char * buffer, int size ) __attribute__ (( __nothrow__, __leaf__, __weak__ )) {}
149int kernel_abort_lastframe( void ) __attribute__ (( __nothrow__, __leaf__, __weak__ )) { return 4; }
150
151enum { abort_text_size = 1024 };
152static char abort_text[ abort_text_size ];
153static int abort_lastframe;
154
155void exit( int status, const char fmt[], ... ) __attribute__ (( format(printf, 2, 3), __nothrow__, __leaf__, __noreturn__ )) {
156 va_list args;
157 va_start( args, fmt );
158 vfprintf( stderr, fmt, args );
159 va_end( args );
160 __cabi_libc.exit( status );
161}
162
163void abort( const char fmt[], ... ) __attribute__ (( format(printf, 1, 2), __nothrow__, __leaf__, __noreturn__ )) {
164 void * kernel_data = kernel_abort(); // must be done here to lock down kernel
165 int len;
166
167 abort_lastframe = kernel_abort_lastframe();
168 len = snprintf( abort_text, abort_text_size, "Cforall Runtime error (UNIX pid:%ld) ", (long int)getpid() ); // use UNIX pid (versus getPid)
169 __cfaabi_dbg_bits_write( abort_text, len );
170
171 if ( fmt ) {
172 va_list args;
173 va_start( args, fmt );
174
175 len = vsnprintf( abort_text, abort_text_size, fmt, args );
176 va_end( args );
177 __cfaabi_dbg_bits_write( abort_text, len );
178
179 if ( fmt[strlen( fmt ) - 1] != '\n' ) { // add optional newline if missing at the end of the format text
180 __cfaabi_dbg_bits_write( "\n", 1 );
181 }
182 }
183
184 kernel_abort_msg( kernel_data, abort_text, abort_text_size );
185 __cabi_libc.abort();
186}
187
188static void __cfaabi_backtrace() {
189 enum {
190 Frames = 50, // maximum number of stack frames
191 Start = 8, // skip first N stack frames
192 };
193
194 void * array[Frames];
195 size_t size = backtrace( array, Frames );
196 char ** messages = backtrace_symbols( array, size );
197
198 // find executable name
199 *index( messages[0], '(' ) = '\0';
200 __cfaabi_dbg_bits_print_nolock( "Stack back trace for: %s\n", messages[0]);
201
202 for ( int i = Start; i < size - abort_lastframe && messages != NULL; i += 1 ) {
203 char * name = NULL, * offset_begin = NULL, * offset_end = NULL;
204
205 for ( char * p = messages[i]; *p; ++p ) {
206 //__cfaabi_dbg_bits_print_nolock( "X %s\n", p);
207 // find parantheses and +offset
208 if ( *p == '(' ) {
209 name = p;
210 }
211 else if ( *p == '+' ) {
212 offset_begin = p;
213 }
214 else if ( *p == ')' ) {
215 offset_end = p;
216 break;
217 }
218 }
219
220 // if line contains symbol print it
221 int frameNo = i - Start;
222 if ( name && offset_begin && offset_end && name < offset_begin ) {
223 // delimit strings
224 *name++ = '\0';
225 *offset_begin++ = '\0';
226 *offset_end++ = '\0';
227
228 __cfaabi_dbg_bits_print_nolock( "(%i) %s : %s + %s %s\n", frameNo, messages[i], name, offset_begin, offset_end);
229 }
230 // otherwise, print the whole line
231 else {
232 __cfaabi_dbg_bits_print_nolock( "(%i) %s\n", frameNo, messages[i] );
233 }
234 }
235 free( messages );
236}
237
238void sigHandler_segv( __CFA_SIGPARMS__ ) {
239 abort( "Addressing invalid memory at location %p\n"
240 "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",
241 sfp->si_addr );
242}
243
244void sigHandler_ill( __CFA_SIGPARMS__ ) {
245 abort( "Executing illegal instruction at location %p.\n"
246 "Possible cause is stack corruption.\n",
247 sfp->si_addr );
248}
249
250void sigHandler_fpe( __CFA_SIGPARMS__ ) {
251 const char * msg;
252
253 choose( sfp->si_code ) {
254 case FPE_INTDIV, FPE_FLTDIV: msg = "divide by zero";
255 case FPE_FLTOVF: msg = "overflow";
256 case FPE_FLTUND: msg = "underflow";
257 case FPE_FLTRES: msg = "inexact result";
258 case FPE_FLTINV: msg = "invalid operation";
259 default: msg = "unknown";
260 } // choose
261 abort( "Computation error %s at location %p.\n", msg, sfp->si_addr );
262}
263
264void sigHandler_abort( __CFA_SIGPARMS__ ) {
265 __cfaabi_backtrace();
266
267 // reset default signal handler
268 __cfaabi_sigdefault( SIGABRT );
269
270 raise( SIGABRT );
271}
272
273void sigHandler_term( __CFA_SIGPARMS__ ) {
274 abort( "Application stopped by %s signal.", sig == SIGINT ? "an interrupt (SIGINT)" : "a terminate (SIGTERM)" );
275}
276
277// Local Variables: //
278// mode: c //
279// tab-width: 4 //
280// End: //
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