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171fba11ab
Currently, if GDBserver hits some internal assertion, it exits with error status, instead of aborting. This makes it harder to debug GDBserver, as you can't just debug a core file if GDBserver fails an assertion. I've had to hack the code to make GDBserver abort to debug something several times before. I believe the reason it exits instead of aborting, is to prevent potentially littering the filesystem of smaller embedded targets with core files. I think I recall Daniel Jacobowitz once saying that many years ago, but I can't be sure. Anyhow, that seems reasonable to me. Since we nowadays have a distinction between development and release modes, I propose to make GDBserver abort on internal error if in development mode, while keeping the status quo when in release mode. Thus, after this patch, in development mode, you get: $ ../gdbserver/gdbserver ../../src/gdbserver/server.cc:3711: A problem internal to GDBserver has been detected. captured_main: Assertion `0' failed. Aborted (core dumped) $ while in release mode, you'll continue to get: $ ../gdbserver/gdbserver ../../src/gdbserver/server.cc:3711: A problem internal to GDBserver has been detected. captured_main: Assertion `0' failed. $ echo $? 1 I do not think that this requires a separate configure switch. A "--target_board=native-extended-gdbserver" run on Ubuntu 20.04 ends up with: === gdb Summary === # of unexpected core files 29 ... for me, of which 8 are GDBserver core dumps, 7 more than without this patch. Change-Id: I6861e08ad71f65a0332c91ec95ca001d130b0e9d
130 lines
3.3 KiB
C++
130 lines
3.3 KiB
C++
/* General utility routines for the remote server for GDB.
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Copyright (C) 1986-2022 Free Software Foundation, Inc.
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This file is part of GDB.
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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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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "server.h"
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#ifdef IN_PROCESS_AGENT
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# define PREFIX "ipa: "
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# define TOOLNAME "GDBserver in-process agent"
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#else
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# define PREFIX "gdbserver: "
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# define TOOLNAME "GDBserver"
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#endif
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/* Generally useful subroutines used throughout the program. */
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/* If in release mode, just exit. This avoids potentially littering
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the filesystem of small embedded targets with core files. If in
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development mode however, abort, producing core files to help with
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debugging GDBserver. */
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static void ATTRIBUTE_NORETURN
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abort_or_exit ()
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{
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#ifdef DEVELOPMENT
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abort ();
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#else
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exit (1);
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#endif
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}
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void
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malloc_failure (long size)
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{
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fprintf (stderr,
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PREFIX "ran out of memory while trying to allocate %lu bytes\n",
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(unsigned long) size);
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abort_or_exit ();
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}
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/* Print the system error message for errno, and also mention STRING
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as the file name for which the error was encountered.
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Then return to command level. */
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void
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perror_with_name (const char *string)
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{
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const char *err;
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char *combined;
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err = safe_strerror (errno);
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if (err == NULL)
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err = "unknown error";
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combined = (char *) alloca (strlen (err) + strlen (string) + 3);
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strcpy (combined, string);
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strcat (combined, ": ");
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strcat (combined, err);
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error ("%s.", combined);
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}
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/* Print an error message and return to top level. */
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void
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verror (const char *string, va_list args)
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{
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#ifdef IN_PROCESS_AGENT
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fflush (stdout);
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vfprintf (stderr, string, args);
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fprintf (stderr, "\n");
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exit (1);
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#else
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throw_verror (GENERIC_ERROR, string, args);
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#endif
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}
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void
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vwarning (const char *string, va_list args)
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{
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fprintf (stderr, PREFIX);
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vfprintf (stderr, string, args);
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fprintf (stderr, "\n");
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}
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/* Report a problem internal to GDBserver, and abort/exit. */
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void
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internal_verror (const char *file, int line, const char *fmt, va_list args)
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{
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fprintf (stderr, "\
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%s:%d: A problem internal to " TOOLNAME " has been detected.\n", file, line);
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vfprintf (stderr, fmt, args);
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fprintf (stderr, "\n");
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abort_or_exit ();
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}
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/* Report a problem internal to GDBserver. */
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void
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internal_vwarning (const char *file, int line, const char *fmt, va_list args)
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{
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fprintf (stderr, "\
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%s:%d: A problem internal to " TOOLNAME " has been detected.\n", file, line);
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vfprintf (stderr, fmt, args);
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fprintf (stderr, "\n");
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}
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/* Convert a CORE_ADDR into a HEX string, like %lx.
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The result is stored in a circular static buffer, NUMCELLS deep. */
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char *
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paddress (CORE_ADDR addr)
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{
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return phex_nz (addr, sizeof (CORE_ADDR));
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}
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