Re: [ES40-developers] [patch] display backtrace on segfault

[Camiel V. <iam...@gm...>]

This has been committed to the CVS repository.

I hope you get a segfault real soon! ;-)

Camiel.

On Feb 7, 2008 3:48 PM, Brian Wheeler <bdw...@in...> wrote:
> Sometimes I get a segfault when I'm running es40.  I've added code
> (specific to g++) which will dump a backtrace and exit.  Of course,
> since I've added that code I've not seen a segfault, but I'm hopeful :)
>
> Brian
>
> ===================================================================
> RCS file: /cvsroot/es40/es40/src/Makefile,v
> retrieving revision 1.20
> diff -u -r1.20 Makefile
> --- Makefile    2 Feb 2008 16:43:01 -0000       1.20
> +++ Makefile    7 Feb 2008 14:47:48 -0000
> @@ -102,7 +102,7 @@
>  #  -O3   -- optimize at level 3
>  #  -mtune=<cpu>   -- cpu is one of:  generic, core2, athlon64,
> pentium4, etc
>  #
> -CTUNINGFLAGS = -O3 -mtune=generic
> +CTUNINGFLAGS = -O3 -mtune=generic
>
>  #
>  # CDEBUGFLAGS - turn on debugging in ES40
> @@ -124,8 +124,9 @@
>  #   -DDEBUG_KBD                    Turn on keyboard debugging
>  #   -DDEBUG_PIC                    Turn on Programmable Interrupt
> Controller debugging
>  #   -DDEBUG_LPT         Turn on debugging for LPT Port
> +#   -DDEBUG_BACKTRACE   Turn on backtrace dump on SIGSEGV
>  #
> -CDEBUGFLAGS = -g -DHIDE_COUNTER
> +CDEBUGFLAGS = -g -DHIDE_COUNTER -DDEBUG_BACKTRACE
>
>  #
>  # ES40 Options
> @@ -247,4 +248,3 @@
>         $(DEPEND) -o.do -a -- $(IDB_CFLAGS) -- $(SRCS)
>  clean:
>         rm -f es40 es40_idb es40_lss es40_lsm *.o *.do *.mao *.slo *.trc
> gui/*.o gui/*.mao gui/*.slo gui/*.do
> -
> Index: AlphaSim.cpp
> ===================================================================
> RCS file: /cvsroot/es40/es40/src/AlphaSim.cpp,v
> retrieving revision 1.39
> diff -u -r1.39 AlphaSim.cpp
> --- AlphaSim.cpp        5 Feb 2008 10:15:57 -0000       1.39
> +++ AlphaSim.cpp        7 Feb 2008 14:47:48 -0000
> @@ -180,6 +180,46 @@
>    0
>  };
>
> +
> +#ifdef DEBUG_BACKTRACE
> +#ifdef __GNUG__
> +#include <execinfo.h>
> +#include <signal.h>
> +#define HAS_BACKTRACE
> +
> +#define BTCOUNT 100
> +void *btbuffer[BTCOUNT];
> +
> +void segv_handler(int signum) {
> +  int nptrs = backtrace(btbuffer, BTCOUNT);
> +  char **strings;
> +
> +  printf("%%SYS-F-SEGFAULT: The Alpha Simulator has Segfaulted.\n");
> +  printf("-SYS-F-SEGFAULT: Backtrace follows.\n");
> +
> +  printf("backtrace() returned %d addresses.\n",nptrs);
> +  strings = backtrace_symbols(btbuffer,nptrs);
> +  if(strings==NULL) {
> +    perror("backtrace_symbols");
> +    exit(1);
> +  }
> +
> +  for(int i = 0; i < nptrs; i++) {
> +    printf("%3d %s\n",nptrs-i, strings[i]);
> +  }
> +  free(strings);
> +  exit(1);
> +}
> +
> +#else
> +#warning "Your compiler isn't configured to support backtraces."
> +#endif // __GNUG__
> +#endif
> +
> +
> +
> +
> +
>  /**
>   * Entry point for the application.
>   *
> @@ -214,6 +254,12 @@
>    char *filename = 0;
>    FILE *f;
>
> +#ifdef HAS_BACKTRACE
> +#ifdef __GNUG__
> +  signal(SIGSEGV, &segv_handler);
> +#endif
> +#endif
> +
>    try
>    {
>  #if defined(IDB) && (defined(LS_MASTER) || defined(LS_SLAVE))
>
>
>
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