source: src/libcfa/interpose.c@ cf0de0e

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 no_list persistent-indexer pthread-emulation qualifiedEnum
Last change on this file since cf0de0e was ad64520, checked in by Thierry Delisle <tdelisle@…>, 7 years ago

Now loading libgcc_s at startup to help avoid problems on abort
  • Property mode set to 100644
File size: 8.7 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 : Sat May 5 11:37:35 2018
13// Update Count : 111
14//
15
16#include <stdarg.h> // va_start, va_end
17#include <string.h> // strlen
18#include <unistd.h> // _exit, getpid
19#define __USE_GNU
20#include <signal.h>
21#undef __USE_GNU
22extern "C" {
23#include <dlfcn.h> // dlopen, dlsym
24#include <execinfo.h> // backtrace, messages
25}
26
27#include "bits/debug.h"
28#include "bits/defs.h"
29#include "bits/signal.h" // sigHandler_?
30#include "startup.h" // STARTUP_PRIORITY_CORE
31
32//=============================================================================================
33// Interposing helpers
34//=============================================================================================
35
36void preload_libgcc(void) {
37 dlopen( "libgcc_s.so.1", RTLD_NOW );
38 if ( const char * error = dlerror() ) abort( "interpose_symbol : internal error pre-loading libgcc, %s\n", error );
39}
40
41typedef void (* generic_fptr_t)(void);
42generic_fptr_t interpose_symbol( const char * symbol, const char * version ) {
43 const char * error;
44
45 static void * library;
46 if ( ! library ) {
47 #if defined( RTLD_NEXT )
48 library = RTLD_NEXT;
49 #else
50 // missing RTLD_NEXT => must hard-code library name, assuming libstdc++
51 library = dlopen( "libc.so.6", RTLD_LAZY );
52 error = dlerror();
53 if ( error ) {
54 abort( "interpose_symbol : failed to open libc, %s\n", error );
55 }
56 #endif
57 } // if
58
59 union { generic_fptr_t fptr; void * ptr; } originalFunc;
60
61 #if defined( _GNU_SOURCE )
62 if ( version ) {
63 originalFunc.ptr = dlvsym( library, symbol, version );
64 } else {
65 originalFunc.ptr = dlsym( library, symbol );
66 }
67 #else
68 originalFunc.ptr = dlsym( library, symbol );
69 #endif // _GNU_SOURCE
70
71 error = dlerror();
72 if ( error ) abort( "interpose_symbol : internal error, %s\n", error );
73
74 return originalFunc.fptr;
75}
76
77#define INTERPOSE_LIBC( x, ver ) __cabi_libc.x = (typeof(__cabi_libc.x))interpose_symbol( #x, ver )
78
79//=============================================================================================
80// Interposition Startup logic
81//=============================================================================================
82
83void sigHandler_segv ( __CFA_SIGPARMS__ );
84void sigHandler_ill ( __CFA_SIGPARMS__ );
85void sigHandler_fpe ( __CFA_SIGPARMS__ );
86void sigHandler_abort( __CFA_SIGPARMS__ );
87void sigHandler_term ( __CFA_SIGPARMS__ );
88
89struct {
90 void (* exit)( int ) __attribute__(( __noreturn__ ));
91 void (* abort)( void ) __attribute__(( __noreturn__ ));
92} __cabi_libc;
93
94extern "C" {
95 void __cfaabi_interpose_startup(void) __attribute__(( constructor( STARTUP_PRIORITY_CORE ) ));
96 void __cfaabi_interpose_startup( void ) {
97 const char *version = NULL;
98
99 preload_libgcc();
100
101#pragma GCC diagnostic push
102#pragma GCC diagnostic ignored "-Wdiscarded-qualifiers"
103 INTERPOSE_LIBC( abort, version );
104 INTERPOSE_LIBC( exit , version );
105#pragma GCC diagnostic pop
106
107 // Failure handler
108 __cfaabi_sigaction( SIGSEGV, sigHandler_segv , SA_SIGINFO );
109 __cfaabi_sigaction( SIGBUS , sigHandler_segv , SA_SIGINFO );
110 __cfaabi_sigaction( SIGILL , sigHandler_ill , SA_SIGINFO );
111 __cfaabi_sigaction( SIGFPE , sigHandler_fpe , SA_SIGINFO );
112 __cfaabi_sigaction( SIGABRT, sigHandler_abort, SA_SIGINFO | SA_RESETHAND);
113 __cfaabi_sigaction( SIGTERM, sigHandler_term , SA_SIGINFO );
114 __cfaabi_sigaction( SIGINT , sigHandler_term , SA_SIGINFO );
115 }
116}
117
118//=============================================================================================
119// Terminating Signals logic
120//=============================================================================================
121
122// Forward declare abort after the __typeof__ call to avoid ambiguities
123void exit( int status, const char fmt[], ... ) __attribute__(( format(printf, 2, 3), __nothrow__, __leaf__, __noreturn__ ));
124void abort( const char fmt[], ... ) __attribute__(( format(printf, 1, 2), __nothrow__, __leaf__, __noreturn__ ));
125
126extern "C" {
127 void abort( void ) __attribute__(( __nothrow__, __leaf__, __noreturn__ )) {
128 abort( NULL );
129 }
130
131 void __cabi_abort( const char fmt[], ... ) __attribute__(( format(printf, 1, 2), __nothrow__, __leaf__, __noreturn__ )) {
132 va_list argp;
133 va_start( argp, fmt );
134 abort( fmt, argp );
135 va_end( argp );
136 }
137
138 void exit( int status ) __attribute__(( __nothrow__, __leaf__, __noreturn__ )) {
139 __cabi_libc.exit( status );
140 }
141}
142
143void * kernel_abort ( void ) __attribute__(( __nothrow__, __leaf__, __weak__ )) { return NULL; }
144void kernel_abort_msg( void * data, char * buffer, int size ) __attribute__(( __nothrow__, __leaf__, __weak__ )) {}
145int kernel_abort_lastframe( void ) __attribute__(( __nothrow__, __leaf__, __weak__ )) { return 4; }
146
147enum { abort_text_size = 1024 };
148static char abort_text[ abort_text_size ];
149static int abort_lastframe;
150
151void exit( int status, const char fmt[], ... ) __attribute__(( format(printf, 2, 3), __nothrow__, __leaf__, __noreturn__ )) {
152 va_list args;
153 va_start( args, fmt );
154 vfprintf( stderr, fmt, args );
155 va_end( args );
156 __cabi_libc.exit( status );
157}
158
159void abort( const char fmt[], ... ) __attribute__(( format(printf, 1, 2), __nothrow__, __leaf__, __noreturn__ )) {
160 void * kernel_data = kernel_abort(); // must be done here to lock down kernel
161 int len;
162
163 abort_lastframe = kernel_abort_lastframe();
164 len = snprintf( abort_text, abort_text_size, "Cforall Runtime error (UNIX pid:%ld) ", (long int)getpid() ); // use UNIX pid (versus getPid)
165 __cfaabi_dbg_bits_write( abort_text, len );
166
167 if ( fmt ) {
168 va_list args;
169 va_start( args, fmt );
170
171 len = vsnprintf( abort_text, abort_text_size, fmt, args );
172 va_end( args );
173 __cfaabi_dbg_bits_write( abort_text, len );
174
175 if ( fmt[strlen( fmt ) - 1] != '\n' ) { // add optional newline if missing at the end of the format text
176 __cfaabi_dbg_bits_write( "\n", 1 );
177 }
178 }
179
180 kernel_abort_msg( kernel_data, abort_text, abort_text_size );
181 __cabi_libc.abort();
182}
183
184static void __cfaabi_backtrace() {
185 enum {
186 Frames = 50, // maximum number of stack frames
187 Start = 8, // skip first N stack frames
188 };
189
190 void * array[Frames];
191 size_t size = backtrace( array, Frames );
192 char ** messages = backtrace_symbols( array, size );
193
194 // find executable name
195 *index( messages[0], '(' ) = '\0';
196 __cfaabi_dbg_bits_print_nolock( "Stack back trace for: %s\n", messages[0]);
197
198 for ( int i = Start; i < size - abort_lastframe && messages != NULL; i += 1 ) {
199 char * name = NULL, * offset_begin = NULL, * offset_end = NULL;
200
201 for ( char * p = messages[i]; *p; ++p ) {
202 //__cfaabi_dbg_bits_print_nolock( "X %s\n", p);
203 // find parantheses and +offset
204 if ( *p == '(' ) {
205 name = p;
206 }
207 else if ( *p == '+' ) {
208 offset_begin = p;
209 }
210 else if ( *p == ')' ) {
211 offset_end = p;
212 break;
213 }
214 }
215
216 // if line contains symbol print it
217 int frameNo = i - Start;
218 if ( name && offset_begin && offset_end && name < offset_begin ) {
219 // delimit strings
220 *name++ = '\0';
221 *offset_begin++ = '\0';
222 *offset_end++ = '\0';
223
224 __cfaabi_dbg_bits_print_nolock( "(%i) %s : %s + %s %s\n", frameNo, messages[i], name, offset_begin, offset_end);
225 }
226 // otherwise, print the whole line
227 else {
228 __cfaabi_dbg_bits_print_nolock( "(%i) %s\n", frameNo, messages[i] );
229 }
230 }
231 free( messages );
232}
233
234void sigHandler_segv( __CFA_SIGPARMS__ ) {
235 abort( "Addressing invalid memory at location %p\n"
236 "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",
237 sfp->si_addr );
238}
239
240void sigHandler_ill( __CFA_SIGPARMS__ ) {
241 abort( "Executing illegal instruction at location %p.\n"
242 "Possible cause is stack corruption.\n",
243 sfp->si_addr );
244}
245
246void sigHandler_fpe( __CFA_SIGPARMS__ ) {
247 const char * msg;
248
249 choose( sfp->si_code ) {
250 case FPE_INTDIV, FPE_FLTDIV: msg = "divide by zero";
251 case FPE_FLTOVF: msg = "overflow";
252 case FPE_FLTUND: msg = "underflow";
253 case FPE_FLTRES: msg = "inexact result";
254 case FPE_FLTINV: msg = "invalid operation";
255 default: msg = "unknown";
256 } // choose
257 abort( "Computation error %s at location %p.\n", msg, sfp->si_addr );
258}
259
260void sigHandler_abort( __CFA_SIGPARMS__ ) {
261 __cfaabi_backtrace();
262
263 // reset default signal handler
264 __cfaabi_sigdefault( SIGABRT );
265
266 raise( SIGABRT );
267}
268
269void sigHandler_term( __CFA_SIGPARMS__ ) {
270 abort( "Application stopped by %s signal.", sig == SIGINT ? "an interrupt (SIGINT)" : "a terminate (SIGTERM)" );
271}
272
273// Local Variables: //
274// mode: c //
275// tab-width: 4 //
276// End: //
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