222 lines
7.3 KiB
C
222 lines
7.3 KiB
C
/*
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crashhandler.c - advanced crashhandler
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Copyright (C) 2016 Mittorn
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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*/
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#include "common.h"
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// while this is mostly POSIX-compatible functions
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// the contents of ucontext_t is platform-dependent
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// before adding new OS here, check platform.h
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#if XASH_FREEBSD || XASH_NETBSD || XASH_OPENBSD || XASH_ANDROID || XASH_LINUX
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#ifndef XASH_OPENBSD
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#include <ucontext.h>
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#endif
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#include <signal.h>
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#include <sys/mman.h>
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#include "library.h"
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#define STACK_BACKTRACE_STR "Stack backtrace:\n"
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#define STACK_DUMP_STR "Stack dump:\n"
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#define STACK_BACKTRACE_STR_LEN ( sizeof( STACK_BACKTRACE_STR ) - 1 )
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#define STACK_DUMP_STR_LEN ( sizeof( STACK_DUMP_STR ) - 1 )
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#define ALIGN( x, y ) (((uintptr_t) ( x ) + (( y ) - 1 )) & ~(( y ) - 1 ))
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static struct sigaction oldFilter;
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static int Sys_PrintFrame( char *buf, int len, int i, void *addr )
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{
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Dl_info dlinfo;
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if( len <= 0 )
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return 0; // overflow
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if( dladdr( addr, &dlinfo ))
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{
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if( dlinfo.dli_sname )
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return Q_snprintf( buf, len, "%2d: %p <%s+%lu> (%s)\n", i, addr, dlinfo.dli_sname,
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(unsigned long)addr - (unsigned long)dlinfo.dli_saddr, dlinfo.dli_fname ); // print symbol, module and address
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return Q_snprintf( buf, len, "%2d: %p (%s)\n", i, addr, dlinfo.dli_fname ); // print module and address
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}
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return Q_snprintf( buf, len, "%2d: %p\n", i, addr ); // print only address
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}
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static void Sys_Crash( int signal, siginfo_t *si, void *context)
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{
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void *pc = NULL, **bp = NULL, **sp = NULL; // this must be set for every OS!
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char message[8192];
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int len, logfd, i = 0;
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#if XASH_OPENBSD
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struct sigcontext *ucontext = (struct sigcontext*)context;
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#else
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ucontext_t *ucontext = (ucontext_t*)context;
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#endif
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#if XASH_AMD64
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#if XASH_FREEBSD
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pc = (void*)ucontext->uc_mcontext.mc_rip;
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bp = (void**)ucontext->uc_mcontext.mc_rbp;
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sp = (void**)ucontext->uc_mcontext.mc_rsp;
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#elif XASH_NETBSD
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pc = (void*)ucontext->uc_mcontext.__gregs[_REG_RIP];
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bp = (void**)ucontext->uc_mcontext.__gregs[_REG_RBP];
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sp = (void**)ucontext->uc_mcontext.__gregs[_REG_RSP];
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#elif XASH_OPENBSD
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pc = (void*)ucontext->sc_rip;
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bp = (void**)ucontext->sc_rbp;
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sp = (void**)ucontext->sc_rsp;
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#else
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pc = (void*)ucontext->uc_mcontext.gregs[REG_RIP];
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bp = (void**)ucontext->uc_mcontext.gregs[REG_RBP];
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sp = (void**)ucontext->uc_mcontext.gregs[REG_RSP];
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#endif
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#elif XASH_X86
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#if XASH_FREEBSD
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pc = (void*)ucontext->uc_mcontext.mc_eip;
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bp = (void**)ucontext->uc_mcontext.mc_ebp;
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sp = (void**)ucontext->uc_mcontext.mc_esp;
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#elif XASH_NETBSD
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pc = (void*)ucontext->uc_mcontext.__gregs[_REG_EIP];
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bp = (void**)ucontext->uc_mcontext.__gregs[_REG_EBP];
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sp = (void**)ucontext->uc_mcontext.__gregs[_REG_ESP];
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#elif XASH_OPENBSD
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pc = (void*)ucontext->sc_eip;
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bp = (void**)ucontext->sc_ebp;
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sp = (void**)ucontext->sc_esp;
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#else
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pc = (void*)ucontext->uc_mcontext.gregs[REG_EIP];
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bp = (void**)ucontext->uc_mcontext.gregs[REG_EBP];
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sp = (void**)ucontext->uc_mcontext.gregs[REG_ESP];
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#endif
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#elif XASH_ARM && XASH_64BIT
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pc = (void*)ucontext->uc_mcontext.pc;
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bp = (void*)ucontext->uc_mcontext.regs[29];
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sp = (void*)ucontext->uc_mcontext.sp;
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#elif XASH_ARM
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pc = (void*)ucontext->uc_mcontext.arm_pc;
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bp = (void*)ucontext->uc_mcontext.arm_fp;
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sp = (void*)ucontext->uc_mcontext.arm_sp;
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#endif
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// safe actions first, stack and memory may be corrupted
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len = Q_snprintf( message, sizeof( message ), "Ver: " XASH_ENGINE_NAME " " XASH_VERSION " (build %i-%s, %s-%s)\n",
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Q_buildnum(), g_buildcommit, Q_buildos(), Q_buildarch() );
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#if !XASH_FREEBSD && !XASH_NETBSD && !XASH_OPENBSD
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len += Q_snprintf( message + len, sizeof( message ) - len, "Crash: signal %d errno %d with code %d at %p %p\n", signal, si->si_errno, si->si_code, si->si_addr, si->si_ptr );
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#else
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len += Q_snprintf( message + len, sizeof( message ) - len, "Crash: signal %d errno %d with code %d at %p\n", signal, si->si_errno, si->si_code, si->si_addr );
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#endif
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write( STDERR_FILENO, message, len );
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// flush buffers before writing directly to descriptors
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fflush( stdout );
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fflush( stderr );
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// now get log fd and write trace directly to log
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logfd = Sys_LogFileNo();
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write( logfd, message, len );
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if( pc && bp && sp )
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{
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size_t pagesize = sysconf( _SC_PAGESIZE );
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// try to print backtrace
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write( STDERR_FILENO, STACK_BACKTRACE_STR, STACK_BACKTRACE_STR_LEN );
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write( logfd, STACK_BACKTRACE_STR, STACK_BACKTRACE_STR_LEN );
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Q_strncpy( message + len, STACK_BACKTRACE_STR, sizeof( message ) - len );
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len += STACK_BACKTRACE_STR_LEN;
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// false on success, true on failure
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#define try_allow_read(pointer, pagesize) \
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(( mprotect( (char *)ALIGN( (pointer), (pagesize) ), (pagesize), PROT_READ | PROT_WRITE | PROT_EXEC ) == -1 ) && \
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( mprotect( (char *)ALIGN( (pointer), (pagesize) ), (pagesize), PROT_READ | PROT_EXEC ) == -1 ) && \
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( mprotect( (char *)ALIGN( (pointer), (pagesize) ), (pagesize), PROT_READ | PROT_WRITE ) == -1 ) && \
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( mprotect( (char *)ALIGN( (pointer), (pagesize) ), (pagesize), PROT_READ ) == -1 ))
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do
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{
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int line = Sys_PrintFrame( message + len, sizeof( message ) - len, ++i, pc);
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write( STDERR_FILENO, message + len, line );
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write( logfd, message + len, line );
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len += line;
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//if( !dladdr(bp,0) ) break; // only when bp is in module
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if( try_allow_read( bp, pagesize ) )
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break;
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if( try_allow_read( bp[0], pagesize ) )
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break;
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pc = bp[1];
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bp = (void**)bp[0];
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}
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while( bp && i < 128 );
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// try to print stack
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write( STDERR_FILENO, STACK_DUMP_STR, STACK_DUMP_STR_LEN );
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write( logfd, STACK_DUMP_STR, STACK_DUMP_STR_LEN );
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Q_strncpy( message + len, STACK_DUMP_STR, sizeof( message ) - len );
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len += STACK_DUMP_STR_LEN;
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if( !try_allow_read( sp, pagesize ) )
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{
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for( i = 0; i < 32; i++ )
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{
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int line = Sys_PrintFrame( message + len, sizeof( message ) - len, i, sp[i] );
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write( STDERR_FILENO, message + len, line );
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write( logfd, message + len, line );
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len += line;
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}
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}
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#undef try_allow_read
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}
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// put MessageBox as Sys_Error
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Msg( "%s\n", message );
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#ifdef XASH_SDL
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SDL_SetWindowGrab( host.hWnd, SDL_FALSE );
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#endif
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host.crashed = true;
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Platform_MessageBox( "Xash Error", message, false );
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// log saved, now we can try to save configs and close log correctly, it may crash
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if( host.type == HOST_NORMAL )
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CL_Crashed();
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host.status = HOST_CRASHED;
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Sys_Quit( "crashed" );
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}
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void Sys_SetupCrashHandler( void )
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{
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struct sigaction act = { 0 };
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act.sa_sigaction = Sys_Crash;
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act.sa_flags = SA_SIGINFO | SA_ONSTACK;
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sigaction( SIGSEGV, &act, &oldFilter );
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sigaction( SIGABRT, &act, &oldFilter );
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sigaction( SIGBUS, &act, &oldFilter );
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sigaction( SIGILL, &act, &oldFilter );
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}
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void Sys_RestoreCrashHandler( void )
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{
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sigaction( SIGSEGV, &oldFilter, NULL );
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sigaction( SIGABRT, &oldFilter, NULL );
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sigaction( SIGBUS, &oldFilter, NULL );
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sigaction( SIGILL, &oldFilter, NULL );
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}
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#endif // XASH_FREEBSD || XASH_NETBSD || XASH_OPENBSD || XASH_ANDROID || XASH_LINUX
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