602e3198bc
gdb/gdbserver/ 2013-08-28 Jan Kratochvil <jan.kratochvil@redhat.com> PR server/15604 * linux-low.c: Include filestuff.h. (linux_create_inferior) <pid == 0>: Call close_most_fds. * lynx-low.c: Include filestuff.h. (lynx_create_inferior) <pid == 0>: Call close_most_fds. * server.c: Include filestuff.h. (main): Call notice_open_fds. * spu-low.c: Include filestuff.h. (spu_create_inferior) <pid == 0>: Call close_most_fds.
726 lines
19 KiB
C
726 lines
19 KiB
C
/* Copyright (C) 2009-2013 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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#include "target.h"
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#include "lynx-low.h"
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#include <limits.h>
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#include <sys/ptrace.h>
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#include <sys/piddef.h> /* Provides PIDGET, TIDGET, BUILDPID, etc. */
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#include <unistd.h>
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#include <sys/ioctl.h>
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#include <sys/types.h>
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#include "gdb_wait.h"
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#include <signal.h>
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#include "filestuff.h"
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int using_threads = 1;
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const struct target_desc *lynx_tdesc;
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/* Per-process private data. */
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struct process_info_private
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{
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/* The PTID obtained from the last wait performed on this process.
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Initialized to null_ptid until the first wait is performed. */
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ptid_t last_wait_event_ptid;
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};
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/* Print a debug trace on standard output if debug_threads is set. */
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static void
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lynx_debug (char *string, ...)
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{
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va_list args;
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if (!debug_threads)
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return;
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va_start (args, string);
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fprintf (stderr, "DEBUG(lynx): ");
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vfprintf (stderr, string, args);
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fprintf (stderr, "\n");
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va_end (args);
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}
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/* Build a ptid_t given a PID and a LynxOS TID. */
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static ptid_t
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lynx_ptid_build (int pid, long tid)
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{
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/* brobecker/2010-06-21: It looks like the LWP field in ptids
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should be distinct for each thread (see write_ptid where it
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writes the thread ID from the LWP). So instead of storing
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the LynxOS tid in the tid field of the ptid, we store it in
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the lwp field. */
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return ptid_build (pid, tid, 0);
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}
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/* Return the process ID of the given PTID.
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This function has little reason to exist, it's just a wrapper around
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ptid_get_pid. But since we have a getter function for the lynxos
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ptid, it feels cleaner to have a getter for the pid as well. */
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static int
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lynx_ptid_get_pid (ptid_t ptid)
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{
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return ptid_get_pid (ptid);
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}
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/* Return the LynxOS tid of the given PTID. */
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static long
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lynx_ptid_get_tid (ptid_t ptid)
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{
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/* See lynx_ptid_build: The LynxOS tid is stored inside the lwp field
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of the ptid. */
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return ptid_get_lwp (ptid);
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}
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/* For a given PTID, return the associated PID as known by the LynxOS
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ptrace layer. */
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static int
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lynx_ptrace_pid_from_ptid (ptid_t ptid)
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{
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return BUILDPID (lynx_ptid_get_pid (ptid), lynx_ptid_get_tid (ptid));
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}
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/* Return a string image of the ptrace REQUEST number. */
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static char *
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ptrace_request_to_str (int request)
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{
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#define CASE(X) case X: return #X
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switch (request)
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{
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CASE(PTRACE_TRACEME);
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CASE(PTRACE_PEEKTEXT);
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CASE(PTRACE_PEEKDATA);
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CASE(PTRACE_PEEKUSER);
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CASE(PTRACE_POKETEXT);
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CASE(PTRACE_POKEDATA);
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CASE(PTRACE_POKEUSER);
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CASE(PTRACE_CONT);
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CASE(PTRACE_KILL);
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CASE(PTRACE_SINGLESTEP);
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CASE(PTRACE_ATTACH);
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CASE(PTRACE_DETACH);
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CASE(PTRACE_GETREGS);
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CASE(PTRACE_SETREGS);
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CASE(PTRACE_GETFPREGS);
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CASE(PTRACE_SETFPREGS);
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CASE(PTRACE_READDATA);
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CASE(PTRACE_WRITEDATA);
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CASE(PTRACE_READTEXT);
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CASE(PTRACE_WRITETEXT);
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CASE(PTRACE_GETFPAREGS);
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CASE(PTRACE_SETFPAREGS);
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CASE(PTRACE_GETWINDOW);
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CASE(PTRACE_SETWINDOW);
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CASE(PTRACE_SYSCALL);
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CASE(PTRACE_DUMPCORE);
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CASE(PTRACE_SETWRBKPT);
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CASE(PTRACE_SETACBKPT);
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CASE(PTRACE_CLRBKPT);
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CASE(PTRACE_GET_UCODE);
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#ifdef PT_READ_GPR
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CASE(PT_READ_GPR);
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#endif
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#ifdef PT_WRITE_GPR
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CASE(PT_WRITE_GPR);
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#endif
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#ifdef PT_READ_FPR
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CASE(PT_READ_FPR);
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#endif
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#ifdef PT_WRITE_FPR
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CASE(PT_WRITE_FPR);
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#endif
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#ifdef PT_READ_VPR
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CASE(PT_READ_VPR);
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#endif
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#ifdef PT_WRITE_VPR
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CASE(PT_WRITE_VPR);
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#endif
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#ifdef PTRACE_PEEKUSP
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CASE(PTRACE_PEEKUSP);
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#endif
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#ifdef PTRACE_POKEUSP
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CASE(PTRACE_POKEUSP);
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#endif
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CASE(PTRACE_PEEKTHREAD);
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CASE(PTRACE_THREADUSER);
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CASE(PTRACE_FPREAD);
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CASE(PTRACE_FPWRITE);
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CASE(PTRACE_SETSIG);
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CASE(PTRACE_CONT_ONE);
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CASE(PTRACE_KILL_ONE);
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CASE(PTRACE_SINGLESTEP_ONE);
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CASE(PTRACE_GETLOADINFO);
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CASE(PTRACE_GETTRACESIG);
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#ifdef PTRACE_GETTHREADLIST
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CASE(PTRACE_GETTHREADLIST);
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#endif
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}
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#undef CASE
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return "<unknown-request>";
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}
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/* A wrapper around ptrace that allows us to print debug traces of
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ptrace calls if debug traces are activated. */
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static int
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lynx_ptrace (int request, ptid_t ptid, int addr, int data, int addr2)
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{
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int result;
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const int pid = lynx_ptrace_pid_from_ptid (ptid);
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int saved_errno;
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if (debug_threads)
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fprintf (stderr, "PTRACE (%s, pid=%d(pid=%d, tid=%d), addr=0x%x, "
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"data=0x%x, addr2=0x%x)",
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ptrace_request_to_str (request), pid, PIDGET (pid), TIDGET (pid),
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addr, data, addr2);
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result = ptrace (request, pid, addr, data, addr2);
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saved_errno = errno;
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if (debug_threads)
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fprintf (stderr, " -> %d (=0x%x)\n", result, result);
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errno = saved_errno;
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return result;
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}
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/* Call add_process with the given parameters, and initializes
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the process' private data. */
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static struct process_info *
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lynx_add_process (int pid, int attached)
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{
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struct process_info *proc;
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proc = add_process (pid, attached);
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proc->tdesc = lynx_tdesc;
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proc->private = xcalloc (1, sizeof (*proc->private));
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proc->private->last_wait_event_ptid = null_ptid;
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return proc;
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}
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/* Implement the create_inferior method of the target_ops vector. */
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static int
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lynx_create_inferior (char *program, char **allargs)
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{
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int pid;
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lynx_debug ("lynx_create_inferior ()");
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pid = fork ();
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if (pid < 0)
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perror_with_name ("fork");
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if (pid == 0)
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{
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int pgrp;
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close_most_fds ();
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/* Switch child to its own process group so that signals won't
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directly affect gdbserver. */
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pgrp = getpid();
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setpgid (0, pgrp);
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ioctl (0, TIOCSPGRP, &pgrp);
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lynx_ptrace (PTRACE_TRACEME, null_ptid, 0, 0, 0);
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execv (program, allargs);
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fprintf (stderr, "Cannot exec %s: %s.\n", program, strerror (errno));
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fflush (stderr);
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_exit (0177);
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}
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lynx_add_process (pid, 0);
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/* Do not add the process thread just yet, as we do not know its tid.
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We will add it later, during the wait for the STOP event corresponding
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to the lynx_ptrace (PTRACE_TRACEME) call above. */
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return pid;
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}
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/* Implement the attach target_ops method. */
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static int
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lynx_attach (unsigned long pid)
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{
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ptid_t ptid = lynx_ptid_build (pid, 0);
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if (lynx_ptrace (PTRACE_ATTACH, ptid, 0, 0, 0) != 0)
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error ("Cannot attach to process %lu: %s (%d)\n", pid,
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strerror (errno), errno);
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lynx_add_process (pid, 1);
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add_thread (ptid, NULL);
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return 0;
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}
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/* Implement the resume target_ops method. */
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static void
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lynx_resume (struct thread_resume *resume_info, size_t n)
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{
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/* FIXME: Assume for now that n == 1. */
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ptid_t ptid = resume_info[0].thread;
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const int request = (resume_info[0].kind == resume_step
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? PTRACE_SINGLESTEP : PTRACE_CONT);
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const int signal = resume_info[0].sig;
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/* If given a minus_one_ptid, then try using the current_process'
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private->last_wait_event_ptid. On most LynxOS versions,
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using any of the process' thread works well enough, but
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LynxOS 178 is a little more sensitive, and triggers some
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unexpected signals (Eg SIG61) when we resume the inferior
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using a different thread. */
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if (ptid_equal (ptid, minus_one_ptid))
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ptid = current_process()->private->last_wait_event_ptid;
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/* The ptid might still be minus_one_ptid; this can happen between
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the moment we create the inferior or attach to a process, and
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the moment we resume its execution for the first time. It is
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fine to use the current_inferior's ptid in those cases. */
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if (ptid_equal (ptid, minus_one_ptid))
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ptid = thread_to_gdb_id (current_inferior);
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regcache_invalidate ();
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errno = 0;
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lynx_ptrace (request, ptid, 1, signal, 0);
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if (errno)
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perror_with_name ("ptrace");
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}
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/* Resume the execution of the given PTID. */
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static void
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lynx_continue (ptid_t ptid)
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{
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struct thread_resume resume_info;
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resume_info.thread = ptid;
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resume_info.kind = resume_continue;
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resume_info.sig = 0;
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lynx_resume (&resume_info, 1);
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}
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/* A wrapper around waitpid that handles the various idiosyncrasies
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of LynxOS' waitpid. */
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static int
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lynx_waitpid (int pid, int *stat_loc)
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{
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int ret = 0;
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while (1)
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{
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ret = waitpid (pid, stat_loc, WNOHANG);
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if (ret < 0)
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{
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/* An ECHILD error is not indicative of a real problem.
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It happens for instance while waiting for the inferior
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to stop after attaching to it. */
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if (errno != ECHILD)
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perror_with_name ("waitpid (WNOHANG)");
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}
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if (ret > 0)
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break;
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/* No event with WNOHANG. See if there is one with WUNTRACED. */
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ret = waitpid (pid, stat_loc, WNOHANG | WUNTRACED);
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if (ret < 0)
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{
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/* An ECHILD error is not indicative of a real problem.
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It happens for instance while waiting for the inferior
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to stop after attaching to it. */
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if (errno != ECHILD)
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perror_with_name ("waitpid (WNOHANG|WUNTRACED)");
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}
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if (ret > 0)
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break;
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usleep (1000);
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}
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return ret;
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}
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/* Implement the wait target_ops method. */
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static ptid_t
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lynx_wait_1 (ptid_t ptid, struct target_waitstatus *status, int options)
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{
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int pid;
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int ret;
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int wstat;
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ptid_t new_ptid;
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if (ptid_equal (ptid, minus_one_ptid))
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pid = lynx_ptid_get_pid (thread_to_gdb_id (current_inferior));
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else
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pid = BUILDPID (lynx_ptid_get_pid (ptid), lynx_ptid_get_tid (ptid));
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retry:
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ret = lynx_waitpid (pid, &wstat);
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new_ptid = lynx_ptid_build (ret, ((union wait *) &wstat)->w_tid);
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find_process_pid (ret)->private->last_wait_event_ptid = new_ptid;
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/* If this is a new thread, then add it now. The reason why we do
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this here instead of when handling new-thread events is because
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we need to add the thread associated to the "main" thread - even
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for non-threaded applications where the new-thread events are not
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generated. */
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if (!find_thread_ptid (new_ptid))
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{
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lynx_debug ("New thread: (pid = %d, tid = %d)",
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lynx_ptid_get_pid (new_ptid), lynx_ptid_get_tid (new_ptid));
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add_thread (new_ptid, NULL);
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}
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if (WIFSTOPPED (wstat))
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{
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status->kind = TARGET_WAITKIND_STOPPED;
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status->value.integer = gdb_signal_from_host (WSTOPSIG (wstat));
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lynx_debug ("process stopped with signal: %d",
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status->value.integer);
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}
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else if (WIFEXITED (wstat))
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{
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status->kind = TARGET_WAITKIND_EXITED;
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status->value.integer = WEXITSTATUS (wstat);
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lynx_debug ("process exited with code: %d", status->value.integer);
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}
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else if (WIFSIGNALED (wstat))
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{
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status->kind = TARGET_WAITKIND_SIGNALLED;
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status->value.integer = gdb_signal_from_host (WTERMSIG (wstat));
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lynx_debug ("process terminated with code: %d",
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status->value.integer);
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}
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else
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{
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/* Not sure what happened if we get here, or whether we can
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in fact get here. But if we do, handle the event the best
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we can. */
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status->kind = TARGET_WAITKIND_STOPPED;
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status->value.integer = gdb_signal_from_host (0);
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lynx_debug ("unknown event ????");
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}
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/* SIGTRAP events are generated for situations other than single-step/
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breakpoint events (Eg. new-thread events). Handle those other types
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of events, and resume the execution if necessary. */
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if (status->kind == TARGET_WAITKIND_STOPPED
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&& status->value.integer == GDB_SIGNAL_TRAP)
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{
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const int realsig = lynx_ptrace (PTRACE_GETTRACESIG, new_ptid, 0, 0, 0);
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lynx_debug ("(realsig = %d)", realsig);
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switch (realsig)
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{
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case SIGNEWTHREAD:
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/* We just added the new thread above. No need to do anything
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further. Just resume the execution again. */
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lynx_continue (new_ptid);
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goto retry;
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case SIGTHREADEXIT:
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remove_thread (find_thread_ptid (new_ptid));
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lynx_continue (new_ptid);
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goto retry;
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}
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}
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return new_ptid;
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}
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/* A wrapper around lynx_wait_1 that also prints debug traces when
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such debug traces have been activated. */
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static ptid_t
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lynx_wait (ptid_t ptid, struct target_waitstatus *status, int options)
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{
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ptid_t new_ptid;
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lynx_debug ("lynx_wait (pid = %d, tid = %ld)",
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lynx_ptid_get_pid (ptid), lynx_ptid_get_tid (ptid));
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new_ptid = lynx_wait_1 (ptid, status, options);
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lynx_debug (" -> (pid=%d, tid=%ld, status->kind = %d)",
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lynx_ptid_get_pid (new_ptid), lynx_ptid_get_tid (new_ptid),
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status->kind);
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return new_ptid;
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}
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/* Implement the kill target_ops method. */
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static int
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lynx_kill (int pid)
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{
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ptid_t ptid = lynx_ptid_build (pid, 0);
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struct target_waitstatus status;
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struct process_info *process;
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process = find_process_pid (pid);
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if (process == NULL)
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return -1;
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lynx_ptrace (PTRACE_KILL, ptid, 0, 0, 0);
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lynx_wait (ptid, &status, 0);
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the_target->mourn (process);
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return 0;
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}
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/* Implement the detach target_ops method. */
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static int
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lynx_detach (int pid)
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{
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ptid_t ptid = lynx_ptid_build (pid, 0);
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struct process_info *process;
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process = find_process_pid (pid);
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if (process == NULL)
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return -1;
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lynx_ptrace (PTRACE_DETACH, ptid, 0, 0, 0);
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the_target->mourn (process);
|
|
return 0;
|
|
}
|
|
|
|
/* Implement the mourn target_ops method. */
|
|
|
|
static void
|
|
lynx_mourn (struct process_info *proc)
|
|
{
|
|
/* Free our private data. */
|
|
free (proc->private);
|
|
proc->private = NULL;
|
|
|
|
clear_inferiors ();
|
|
}
|
|
|
|
/* Implement the join target_ops method. */
|
|
|
|
static void
|
|
lynx_join (int pid)
|
|
{
|
|
/* The PTRACE_DETACH is sufficient to detach from the process.
|
|
So no need to do anything extra. */
|
|
}
|
|
|
|
/* Implement the thread_alive target_ops method. */
|
|
|
|
static int
|
|
lynx_thread_alive (ptid_t ptid)
|
|
{
|
|
/* The list of threads is updated at the end of each wait, so it
|
|
should be up to date. No need to re-fetch it. */
|
|
return (find_thread_ptid (ptid) != NULL);
|
|
}
|
|
|
|
/* Implement the fetch_registers target_ops method. */
|
|
|
|
static void
|
|
lynx_fetch_registers (struct regcache *regcache, int regno)
|
|
{
|
|
struct lynx_regset_info *regset = lynx_target_regsets;
|
|
ptid_t inferior_ptid = thread_to_gdb_id (current_inferior);
|
|
|
|
lynx_debug ("lynx_fetch_registers (regno = %d)", regno);
|
|
|
|
while (regset->size >= 0)
|
|
{
|
|
char *buf;
|
|
int res;
|
|
|
|
buf = xmalloc (regset->size);
|
|
res = lynx_ptrace (regset->get_request, inferior_ptid, (int) buf, 0, 0);
|
|
if (res < 0)
|
|
perror ("ptrace");
|
|
regset->store_function (regcache, buf);
|
|
free (buf);
|
|
regset++;
|
|
}
|
|
}
|
|
|
|
/* Implement the store_registers target_ops method. */
|
|
|
|
static void
|
|
lynx_store_registers (struct regcache *regcache, int regno)
|
|
{
|
|
struct lynx_regset_info *regset = lynx_target_regsets;
|
|
ptid_t inferior_ptid = thread_to_gdb_id (current_inferior);
|
|
|
|
lynx_debug ("lynx_store_registers (regno = %d)", regno);
|
|
|
|
while (regset->size >= 0)
|
|
{
|
|
char *buf;
|
|
int res;
|
|
|
|
buf = xmalloc (regset->size);
|
|
res = lynx_ptrace (regset->get_request, inferior_ptid, (int) buf, 0, 0);
|
|
if (res == 0)
|
|
{
|
|
/* Then overlay our cached registers on that. */
|
|
regset->fill_function (regcache, buf);
|
|
/* Only now do we write the register set. */
|
|
res = lynx_ptrace (regset->set_request, inferior_ptid, (int) buf,
|
|
0, 0);
|
|
}
|
|
if (res < 0)
|
|
perror ("ptrace");
|
|
free (buf);
|
|
regset++;
|
|
}
|
|
}
|
|
|
|
/* Implement the read_memory target_ops method. */
|
|
|
|
static int
|
|
lynx_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len)
|
|
{
|
|
/* On LynxOS, memory reads needs to be performed in chunks the size
|
|
of int types, and they should also be aligned accordingly. */
|
|
int buf;
|
|
const int xfer_size = sizeof (buf);
|
|
CORE_ADDR addr = memaddr & -(CORE_ADDR) xfer_size;
|
|
ptid_t inferior_ptid = thread_to_gdb_id (current_inferior);
|
|
|
|
while (addr < memaddr + len)
|
|
{
|
|
int skip = 0;
|
|
int truncate = 0;
|
|
|
|
errno = 0;
|
|
if (addr < memaddr)
|
|
skip = memaddr - addr;
|
|
if (addr + xfer_size > memaddr + len)
|
|
truncate = addr + xfer_size - memaddr - len;
|
|
buf = lynx_ptrace (PTRACE_PEEKTEXT, inferior_ptid, addr, 0, 0);
|
|
if (errno)
|
|
return errno;
|
|
memcpy (myaddr + (addr - memaddr) + skip, (gdb_byte *) &buf + skip,
|
|
xfer_size - skip - truncate);
|
|
addr += xfer_size;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Implement the write_memory target_ops method. */
|
|
|
|
static int
|
|
lynx_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len)
|
|
{
|
|
/* On LynxOS, memory writes needs to be performed in chunks the size
|
|
of int types, and they should also be aligned accordingly. */
|
|
int buf;
|
|
const int xfer_size = sizeof (buf);
|
|
CORE_ADDR addr = memaddr & -(CORE_ADDR) xfer_size;
|
|
ptid_t inferior_ptid = thread_to_gdb_id (current_inferior);
|
|
|
|
while (addr < memaddr + len)
|
|
{
|
|
int skip = 0;
|
|
int truncate = 0;
|
|
|
|
if (addr < memaddr)
|
|
skip = memaddr - addr;
|
|
if (addr + xfer_size > memaddr + len)
|
|
truncate = addr + xfer_size - memaddr - len;
|
|
if (skip > 0 || truncate > 0)
|
|
/* We need to read the memory at this address in order to preserve
|
|
the data that we are not overwriting. */
|
|
lynx_read_memory (addr, (unsigned char *) &buf, xfer_size);
|
|
if (errno)
|
|
return errno;
|
|
memcpy ((gdb_byte *) &buf + skip, myaddr + (addr - memaddr) + skip,
|
|
xfer_size - skip - truncate);
|
|
errno = 0;
|
|
lynx_ptrace (PTRACE_POKETEXT, inferior_ptid, addr, buf, 0);
|
|
if (errno)
|
|
return errno;
|
|
addr += xfer_size;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Implement the kill_request target_ops method. */
|
|
|
|
static void
|
|
lynx_request_interrupt (void)
|
|
{
|
|
ptid_t inferior_ptid = thread_to_gdb_id (current_inferior);
|
|
|
|
kill (lynx_ptid_get_pid (inferior_ptid), SIGINT);
|
|
}
|
|
|
|
/* The LynxOS target_ops vector. */
|
|
|
|
static struct target_ops lynx_target_ops = {
|
|
lynx_create_inferior,
|
|
lynx_attach,
|
|
lynx_kill,
|
|
lynx_detach,
|
|
lynx_mourn,
|
|
lynx_join,
|
|
lynx_thread_alive,
|
|
lynx_resume,
|
|
lynx_wait,
|
|
lynx_fetch_registers,
|
|
lynx_store_registers,
|
|
NULL, /* prepare_to_access_memory */
|
|
NULL, /* done_accessing_memory */
|
|
lynx_read_memory,
|
|
lynx_write_memory,
|
|
NULL, /* look_up_symbols */
|
|
lynx_request_interrupt,
|
|
NULL, /* read_auxv */
|
|
NULL, /* insert_point */
|
|
NULL, /* remove_point */
|
|
NULL, /* stopped_by_watchpoint */
|
|
NULL, /* stopped_data_address */
|
|
NULL, /* read_offsets */
|
|
NULL, /* get_tls_address */
|
|
NULL, /* qxfer_spu */
|
|
NULL, /* hostio_last_error */
|
|
NULL, /* qxfer_osdata */
|
|
NULL, /* qxfer_siginfo */
|
|
NULL, /* supports_non_stop */
|
|
NULL, /* async */
|
|
NULL, /* start_non_stop */
|
|
NULL, /* supports_multi_process */
|
|
NULL, /* handle_monitor_command */
|
|
};
|
|
|
|
void
|
|
initialize_low (void)
|
|
{
|
|
set_target_ops (&lynx_target_ops);
|
|
the_low_target.arch_setup ();
|
|
}
|
|
|