7343d46ade
* infptrace.c (udot_info): Change type of udot_off to long. Use paddr when printing udot_off's value.
687 lines
18 KiB
C
687 lines
18 KiB
C
/* Low level Unix child interface to ptrace, for GDB when running under Unix.
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Copyright 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996,
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1998, 1999, 2000, 2001, 2002
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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 2 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, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "defs.h"
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#include "frame.h"
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#include "inferior.h"
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#include "target.h"
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#include "gdb_string.h"
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#include "regcache.h"
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#include "gdb_wait.h"
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#include "command.h"
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#ifdef USG
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#include <sys/types.h>
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#endif
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#include <sys/param.h>
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#include "gdb_dirent.h"
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#include <signal.h>
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#include <sys/ioctl.h>
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#ifdef HAVE_PTRACE_H
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#include <ptrace.h>
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#else
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#ifdef HAVE_SYS_PTRACE_H
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#include <sys/ptrace.h>
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#endif
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#endif
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#if !defined (PT_READ_I)
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#define PT_READ_I 1 /* Read word from text space */
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#endif
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#if !defined (PT_READ_D)
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#define PT_READ_D 2 /* Read word from data space */
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#endif
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#if !defined (PT_READ_U)
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#define PT_READ_U 3 /* Read word from kernel user struct */
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#endif
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#if !defined (PT_WRITE_I)
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#define PT_WRITE_I 4 /* Write word to text space */
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#endif
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#if !defined (PT_WRITE_D)
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#define PT_WRITE_D 5 /* Write word to data space */
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#endif
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#if !defined (PT_WRITE_U)
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#define PT_WRITE_U 6 /* Write word to kernel user struct */
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#endif
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#if !defined (PT_CONTINUE)
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#define PT_CONTINUE 7 /* Continue after signal */
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#endif
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#if !defined (PT_STEP)
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#define PT_STEP 9 /* Set flag for single stepping */
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#endif
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#if !defined (PT_KILL)
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#define PT_KILL 8 /* Send child a SIGKILL signal */
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#endif
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#ifndef PT_ATTACH
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#define PT_ATTACH PTRACE_ATTACH
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#endif
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#ifndef PT_DETACH
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#define PT_DETACH PTRACE_DETACH
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#endif
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#include "gdbcore.h"
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#ifndef NO_SYS_FILE
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#include <sys/file.h>
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#endif
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#if 0
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/* Don't think this is used anymore. On the sequent (not sure whether it's
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dynix or ptx or both), it is included unconditionally by sys/user.h and
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not protected against multiple inclusion. */
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#include "gdb_stat.h"
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#endif
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#if !defined (FETCH_INFERIOR_REGISTERS)
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#include <sys/user.h> /* Probably need to poke the user structure */
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#if defined (KERNEL_U_ADDR_BSD)
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#include <a.out.h> /* For struct nlist */
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#endif /* KERNEL_U_ADDR_BSD. */
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#endif /* !FETCH_INFERIOR_REGISTERS */
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#if !defined (CHILD_XFER_MEMORY)
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static void udot_info (char *, int);
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#endif
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#if !defined (FETCH_INFERIOR_REGISTERS)
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static void fetch_register (int);
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static void store_register (int);
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#endif
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void _initialize_kernel_u_addr (void);
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void _initialize_infptrace (void);
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/* This function simply calls ptrace with the given arguments.
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It exists so that all calls to ptrace are isolated in this
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machine-dependent file. */
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int
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call_ptrace (int request, int pid, PTRACE_ARG3_TYPE addr, int data)
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{
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int pt_status = 0;
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#if 0
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int saved_errno;
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printf ("call_ptrace(request=%d, pid=%d, addr=0x%x, data=0x%x)",
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request, pid, addr, data);
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#endif
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#if defined(PT_SETTRC)
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/* If the parent can be told to attach to us, try to do it. */
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if (request == PT_SETTRC)
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{
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errno = 0;
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#if !defined (FIVE_ARG_PTRACE)
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pt_status = ptrace (PT_SETTRC, pid, addr, data);
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#else
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/* Deal with HPUX 8.0 braindamage. We never use the
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calls which require the fifth argument. */
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pt_status = ptrace (PT_SETTRC, pid, addr, data, 0);
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#endif
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if (errno)
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perror_with_name ("ptrace");
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#if 0
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printf (" = %d\n", pt_status);
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#endif
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if (pt_status < 0)
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return pt_status;
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else
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return parent_attach_all (pid, addr, data);
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}
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#endif
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#if defined(PT_CONTIN1)
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/* On HPUX, PT_CONTIN1 is a form of continue that preserves pending
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signals. If it's available, use it. */
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if (request == PT_CONTINUE)
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request = PT_CONTIN1;
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#endif
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#if defined(PT_SINGLE1)
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/* On HPUX, PT_SINGLE1 is a form of step that preserves pending
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signals. If it's available, use it. */
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if (request == PT_STEP)
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request = PT_SINGLE1;
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#endif
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#if 0
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saved_errno = errno;
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errno = 0;
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#endif
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#if !defined (FIVE_ARG_PTRACE)
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pt_status = ptrace (request, pid, addr, data);
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#else
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/* Deal with HPUX 8.0 braindamage. We never use the
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calls which require the fifth argument. */
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pt_status = ptrace (request, pid, addr, data, 0);
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#endif
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#if 0
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if (errno)
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printf (" [errno = %d]", errno);
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errno = saved_errno;
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printf (" = 0x%x\n", pt_status);
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#endif
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return pt_status;
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}
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#if defined (DEBUG_PTRACE) || defined (FIVE_ARG_PTRACE)
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/* For the rest of the file, use an extra level of indirection */
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/* This lets us breakpoint usefully on call_ptrace. */
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#define ptrace call_ptrace
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#endif
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/* Wait for a process to finish, possibly running a target-specific
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hook before returning. */
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int
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ptrace_wait (ptid_t ptid, int *status)
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{
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int wstate;
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wstate = wait (status);
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target_post_wait (pid_to_ptid (wstate), *status);
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return wstate;
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}
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void
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kill_inferior (void)
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{
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int status;
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int pid = PIDGET (inferior_ptid);
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if (pid == 0)
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return;
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/* This once used to call "kill" to kill the inferior just in case
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the inferior was still running. As others have noted in the past
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(kingdon) there shouldn't be any way to get here if the inferior
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is still running -- else there's a major problem elsewere in gdb
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and it needs to be fixed.
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The kill call causes problems under hpux10, so it's been removed;
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if this causes problems we'll deal with them as they arise. */
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ptrace (PT_KILL, pid, (PTRACE_ARG3_TYPE) 0, 0);
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ptrace_wait (null_ptid, &status);
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target_mourn_inferior ();
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}
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#ifndef CHILD_RESUME
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/* Resume execution of the inferior process.
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If STEP is nonzero, single-step it.
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If SIGNAL is nonzero, give it that signal. */
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void
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child_resume (ptid_t ptid, int step, enum target_signal signal)
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{
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int pid = PIDGET (ptid);
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errno = 0;
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if (pid == -1)
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/* Resume all threads. */
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/* I think this only gets used in the non-threaded case, where "resume
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all threads" and "resume inferior_ptid" are the same. */
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pid = PIDGET (inferior_ptid);
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/* An address of (PTRACE_ARG3_TYPE)1 tells ptrace to continue from where
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it was. (If GDB wanted it to start some other way, we have already
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written a new PC value to the child.)
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If this system does not support PT_STEP, a higher level function will
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have called single_step() to transmute the step request into a
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continue request (by setting breakpoints on all possible successor
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instructions), so we don't have to worry about that here. */
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if (step)
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{
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if (SOFTWARE_SINGLE_STEP_P ())
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internal_error (__FILE__, __LINE__, "failed internal consistency check"); /* Make sure this doesn't happen. */
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else
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ptrace (PT_STEP, pid, (PTRACE_ARG3_TYPE) 1,
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target_signal_to_host (signal));
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}
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else
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ptrace (PT_CONTINUE, pid, (PTRACE_ARG3_TYPE) 1,
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target_signal_to_host (signal));
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if (errno)
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{
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perror_with_name ("ptrace");
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}
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}
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#endif /* CHILD_RESUME */
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#ifdef ATTACH_DETACH
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/* Start debugging the process whose number is PID. */
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int
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attach (int pid)
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{
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errno = 0;
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ptrace (PT_ATTACH, pid, (PTRACE_ARG3_TYPE) 0, 0);
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if (errno)
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perror_with_name ("ptrace");
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attach_flag = 1;
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return pid;
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}
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/* Stop debugging the process whose number is PID
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and continue it with signal number SIGNAL.
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SIGNAL = 0 means just continue it. */
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void
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detach (int signal)
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{
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errno = 0;
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ptrace (PT_DETACH, PIDGET (inferior_ptid), (PTRACE_ARG3_TYPE) 1,
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signal);
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if (errno)
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perror_with_name ("ptrace");
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attach_flag = 0;
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}
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#endif /* ATTACH_DETACH */
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/* Default the type of the ptrace transfer to int. */
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#ifndef PTRACE_XFER_TYPE
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#define PTRACE_XFER_TYPE int
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#endif
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/* KERNEL_U_ADDR is the amount to subtract from u.u_ar0
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to get the offset in the core file of the register values. */
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#if defined (KERNEL_U_ADDR_BSD) && !defined (FETCH_INFERIOR_REGISTERS)
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/* Get kernel_u_addr using BSD-style nlist(). */
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CORE_ADDR kernel_u_addr;
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#endif /* KERNEL_U_ADDR_BSD. */
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void
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_initialize_kernel_u_addr (void)
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{
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#if defined (KERNEL_U_ADDR_BSD) && !defined (FETCH_INFERIOR_REGISTERS)
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struct nlist names[2];
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names[0].n_un.n_name = "_u";
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names[1].n_un.n_name = NULL;
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if (nlist ("/vmunix", names) == 0)
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kernel_u_addr = names[0].n_value;
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else
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internal_error (__FILE__, __LINE__,
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"Unable to get kernel u area address.");
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#endif /* KERNEL_U_ADDR_BSD. */
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}
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#if !defined (FETCH_INFERIOR_REGISTERS)
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#if !defined (offsetof)
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#define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)
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#endif
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/* U_REGS_OFFSET is the offset of the registers within the u area. */
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#if !defined (U_REGS_OFFSET)
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#define U_REGS_OFFSET \
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ptrace (PT_READ_U, PIDGET (inferior_ptid), \
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(PTRACE_ARG3_TYPE) (offsetof (struct user, u_ar0)), 0) \
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- KERNEL_U_ADDR
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#endif
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/* Fetch one register. */
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static void
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fetch_register (int regno)
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{
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/* This isn't really an address. But ptrace thinks of it as one. */
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CORE_ADDR regaddr;
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char mess[128]; /* For messages */
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register int i;
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unsigned int offset; /* Offset of registers within the u area. */
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char *buf = alloca (MAX_REGISTER_RAW_SIZE);
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int tid;
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if (CANNOT_FETCH_REGISTER (regno))
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{
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memset (buf, '\0', REGISTER_RAW_SIZE (regno)); /* Supply zeroes */
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supply_register (regno, buf);
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return;
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}
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/* Overload thread id onto process id */
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if ((tid = TIDGET (inferior_ptid)) == 0)
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tid = PIDGET (inferior_ptid); /* no thread id, just use process id */
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offset = U_REGS_OFFSET;
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regaddr = register_addr (regno, offset);
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for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (PTRACE_XFER_TYPE))
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{
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errno = 0;
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*(PTRACE_XFER_TYPE *) & buf[i] = ptrace (PT_READ_U, tid,
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(PTRACE_ARG3_TYPE) regaddr, 0);
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regaddr += sizeof (PTRACE_XFER_TYPE);
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if (errno != 0)
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{
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sprintf (mess, "reading register %s (#%d)",
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REGISTER_NAME (regno), regno);
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perror_with_name (mess);
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}
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}
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supply_register (regno, buf);
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}
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/* Fetch register values from the inferior.
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If REGNO is negative, do this for all registers.
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Otherwise, REGNO specifies which register (so we can save time). */
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void
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fetch_inferior_registers (int regno)
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{
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if (regno >= 0)
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{
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fetch_register (regno);
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}
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else
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{
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for (regno = 0; regno < NUM_REGS; regno++)
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{
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fetch_register (regno);
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}
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}
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}
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/* Store one register. */
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static void
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store_register (int regno)
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{
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/* This isn't really an address. But ptrace thinks of it as one. */
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CORE_ADDR regaddr;
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char mess[128]; /* For messages */
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register int i;
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unsigned int offset; /* Offset of registers within the u area. */
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int tid;
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char *buf = alloca (MAX_REGISTER_RAW_SIZE);
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if (CANNOT_STORE_REGISTER (regno))
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{
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return;
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}
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/* Overload thread id onto process id */
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if ((tid = TIDGET (inferior_ptid)) == 0)
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tid = PIDGET (inferior_ptid); /* no thread id, just use process id */
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offset = U_REGS_OFFSET;
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regaddr = register_addr (regno, offset);
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/* Put the contents of regno into a local buffer */
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regcache_collect (regno, buf);
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/* Store the local buffer into the inferior a chunk at the time. */
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for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (PTRACE_XFER_TYPE))
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{
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errno = 0;
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ptrace (PT_WRITE_U, tid, (PTRACE_ARG3_TYPE) regaddr,
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*(PTRACE_XFER_TYPE *) (buf + i));
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regaddr += sizeof (PTRACE_XFER_TYPE);
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if (errno != 0)
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{
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sprintf (mess, "writing register %s (#%d)",
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REGISTER_NAME (regno), regno);
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perror_with_name (mess);
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}
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}
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}
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/* Store our register values back into the inferior.
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If REGNO is negative, do this for all registers.
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Otherwise, REGNO specifies which register (so we can save time). */
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void
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store_inferior_registers (int regno)
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{
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if (regno >= 0)
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{
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store_register (regno);
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}
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else
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{
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for (regno = 0; regno < NUM_REGS; regno++)
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{
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store_register (regno);
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}
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}
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}
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#endif /* !defined (FETCH_INFERIOR_REGISTERS). */
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/* Set an upper limit on alloca. */
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#ifndef GDB_MAX_ALLOCA
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#define GDB_MAX_ALLOCA 0x1000
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#endif
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#if !defined (CHILD_XFER_MEMORY)
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/* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory
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in the NEW_SUN_PTRACE case. It ought to be straightforward. But
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it appears that writing did not write the data that I specified. I
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cannot understand where it got the data that it actually did write. */
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/* Copy LEN bytes to or from inferior's memory starting at MEMADDR to
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debugger memory starting at MYADDR. Copy to inferior if WRITE is
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nonzero. TARGET is ignored.
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Returns the length copied, which is either the LEN argument or
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zero. This xfer function does not do partial moves, since
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child_ops doesn't allow memory operations to cross below us in the
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target stack anyway. */
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int
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child_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write,
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struct mem_attrib *attrib, struct target_ops *target)
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{
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int i;
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/* Round starting address down to longword boundary. */
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CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE);
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/* Round ending address up; get number of longwords that makes. */
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int count = ((((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1)
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/ sizeof (PTRACE_XFER_TYPE));
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int alloc = count * sizeof (PTRACE_XFER_TYPE);
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PTRACE_XFER_TYPE *buffer;
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struct cleanup *old_chain = NULL;
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#ifdef PT_IO
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/* OpenBSD 3.1, NetBSD 1.6 and FreeBSD 5.0 have a new PT_IO request
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that promises to be much more efficient in reading and writing
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data in the traced process's address space. */
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{
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struct ptrace_io_desc piod;
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/* NOTE: We assume that there are no distinct address spaces for
|
||
instruction and data. */
|
||
piod.piod_op = write ? PIOD_WRITE_D : PIOD_READ_D;
|
||
piod.piod_offs = (void *) memaddr;
|
||
piod.piod_addr = myaddr;
|
||
piod.piod_len = len;
|
||
|
||
if (ptrace (PT_IO, PIDGET (inferior_ptid), (caddr_t) &piod, 0) == -1)
|
||
{
|
||
/* If the PT_IO request is somehow not supported, fallback on
|
||
using PT_WRITE_D/PT_READ_D. Otherwise we will return zero
|
||
to indicate failure. */
|
||
if (errno != EINVAL)
|
||
return 0;
|
||
}
|
||
else
|
||
{
|
||
/* Return the actual number of bytes read or written. */
|
||
return piod.piod_len;
|
||
}
|
||
}
|
||
#endif
|
||
|
||
/* Allocate buffer of that many longwords. */
|
||
if (len < GDB_MAX_ALLOCA)
|
||
{
|
||
buffer = (PTRACE_XFER_TYPE *) alloca (alloc);
|
||
}
|
||
else
|
||
{
|
||
buffer = (PTRACE_XFER_TYPE *) xmalloc (alloc);
|
||
old_chain = make_cleanup (xfree, buffer);
|
||
}
|
||
|
||
if (write)
|
||
{
|
||
/* Fill start and end extra bytes of buffer with existing memory
|
||
data. */
|
||
if (addr != memaddr || len < (int) sizeof (PTRACE_XFER_TYPE))
|
||
{
|
||
/* Need part of initial word -- fetch it. */
|
||
buffer[0] = ptrace (PT_READ_I, PIDGET (inferior_ptid),
|
||
(PTRACE_ARG3_TYPE) addr, 0);
|
||
}
|
||
|
||
if (count > 1) /* FIXME, avoid if even boundary. */
|
||
{
|
||
buffer[count - 1] =
|
||
ptrace (PT_READ_I, PIDGET (inferior_ptid),
|
||
((PTRACE_ARG3_TYPE)
|
||
(addr + (count - 1) * sizeof (PTRACE_XFER_TYPE))), 0);
|
||
}
|
||
|
||
/* Copy data to be written over corresponding part of buffer. */
|
||
memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)),
|
||
myaddr, len);
|
||
|
||
/* Write the entire buffer. */
|
||
for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE))
|
||
{
|
||
errno = 0;
|
||
ptrace (PT_WRITE_D, PIDGET (inferior_ptid),
|
||
(PTRACE_ARG3_TYPE) addr, buffer[i]);
|
||
if (errno)
|
||
{
|
||
/* Using the appropriate one (I or D) is necessary for
|
||
Gould NP1, at least. */
|
||
errno = 0;
|
||
ptrace (PT_WRITE_I, PIDGET (inferior_ptid),
|
||
(PTRACE_ARG3_TYPE) addr, buffer[i]);
|
||
}
|
||
if (errno)
|
||
return 0;
|
||
}
|
||
#ifdef CLEAR_INSN_CACHE
|
||
CLEAR_INSN_CACHE ();
|
||
#endif
|
||
}
|
||
else
|
||
{
|
||
/* Read all the longwords. */
|
||
for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE))
|
||
{
|
||
errno = 0;
|
||
buffer[i] = ptrace (PT_READ_I, PIDGET (inferior_ptid),
|
||
(PTRACE_ARG3_TYPE) addr, 0);
|
||
if (errno)
|
||
return 0;
|
||
QUIT;
|
||
}
|
||
|
||
/* Copy appropriate bytes out of the buffer. */
|
||
memcpy (myaddr,
|
||
(char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)),
|
||
len);
|
||
}
|
||
|
||
if (old_chain != NULL)
|
||
do_cleanups (old_chain);
|
||
return len;
|
||
}
|
||
|
||
|
||
static void
|
||
udot_info (char *dummy1, int dummy2)
|
||
{
|
||
#if defined (KERNEL_U_SIZE)
|
||
long udot_off; /* Offset into user struct */
|
||
int udot_val; /* Value from user struct at udot_off */
|
||
char mess[128]; /* For messages */
|
||
#endif
|
||
|
||
if (!target_has_execution)
|
||
{
|
||
error ("The program is not being run.");
|
||
}
|
||
|
||
#if !defined (KERNEL_U_SIZE)
|
||
|
||
/* Adding support for this command is easy. Typically you just add a
|
||
routine, called "kernel_u_size" that returns the size of the user
|
||
struct, to the appropriate *-nat.c file and then add to the native
|
||
config file "#define KERNEL_U_SIZE kernel_u_size()" */
|
||
error ("Don't know how large ``struct user'' is in this version of gdb.");
|
||
|
||
#else
|
||
|
||
for (udot_off = 0; udot_off < KERNEL_U_SIZE; udot_off += sizeof (udot_val))
|
||
{
|
||
if ((udot_off % 24) == 0)
|
||
{
|
||
if (udot_off > 0)
|
||
{
|
||
printf_filtered ("\n");
|
||
}
|
||
printf_filtered ("%s:", paddr (udot_off));
|
||
}
|
||
udot_val = ptrace (PT_READ_U, PIDGET (inferior_ptid), (PTRACE_ARG3_TYPE) udot_off, 0);
|
||
if (errno != 0)
|
||
{
|
||
sprintf (mess, "\nreading user struct at offset 0x%s",
|
||
paddr_nz (udot_off));
|
||
perror_with_name (mess);
|
||
}
|
||
/* Avoid using nonportable (?) "*" in print specs */
|
||
printf_filtered (sizeof (int) == 4 ? " 0x%08x" : " 0x%16x", udot_val);
|
||
}
|
||
printf_filtered ("\n");
|
||
|
||
#endif
|
||
}
|
||
#endif /* !defined (CHILD_XFER_MEMORY). */
|
||
|
||
|
||
void
|
||
_initialize_infptrace (void)
|
||
{
|
||
#if !defined (CHILD_XFER_MEMORY)
|
||
add_info ("udot", udot_info,
|
||
"Print contents of kernel ``struct user'' for current child.");
|
||
#endif
|
||
}
|