679 lines
16 KiB
C
679 lines
16 KiB
C
/* Kernel core dump functions below target vector, for GDB.
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Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1995
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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, Boston, MA 02111-1307, USA.
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*/
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/* $FreeBSD$ */
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/*
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* This works like "remote" but, you use it like this:
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* target kcore /dev/mem
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* or
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* target kcore /var/crash/host/core.0
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*
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* This way makes it easy to short-circut the whole bfd monster,
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* and direct the inferior stuff to our libkvm implementation.
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*
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*/
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/proc.h>
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#include <sys/user.h>
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#include <errno.h>
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#include <signal.h>
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#include <fcntl.h>
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#include <kvm.h>
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#include <sys/sysctl.h>
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#include <paths.h>
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#include <readline/tilde.h>
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#include <machine/frame.h>
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#include "defs.h"
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#include "gdb_string.h"
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#include "frame.h" /* required by inferior.h */
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#include "inferior.h"
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#include "symtab.h"
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#include "symfile.h"
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#include "objfiles.h"
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#include "command.h"
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#include "bfd.h"
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#include "target.h"
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#include "gdbcore.h"
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static void
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kcore_files_info (struct target_ops *);
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static void
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kcore_close (int);
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static void
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get_kcore_registers (int);
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static int
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xfer_mem (CORE_ADDR, char *, int, int, struct target_ops *);
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static int
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xfer_umem (CORE_ADDR, char *, int, int);
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static char *core_file;
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static kvm_t *core_kd;
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static struct pcb cur_pcb;
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static struct kinfo_proc *cur_proc;
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static struct target_ops kcore_ops;
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int kernel_debugging;
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int kernel_writablecore;
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/* Read the "thing" at kernel address 'addr' into the space pointed to
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by point. The length of the "thing" is determined by the type of p.
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Result is non-zero if transfer fails. */
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#define kvread(addr, p) \
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(target_read_memory ((CORE_ADDR) (addr), (char *) (p), sizeof (*(p))))
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static CORE_ADDR
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ksym_kernbase (void)
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{
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static CORE_ADDR kernbase;
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struct minimal_symbol *sym;
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if (kernbase == 0)
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{
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sym = lookup_minimal_symbol ("kernbase", NULL, NULL);
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if (sym == NULL) {
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kernbase = KERNBASE;
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} else {
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kernbase = SYMBOL_VALUE_ADDRESS (sym);
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}
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}
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return kernbase;
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}
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#define KERNOFF (ksym_kernbase ())
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#define INKERNEL(x) ((x) >= KERNOFF)
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CORE_ADDR
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ksym_lookup(const char *name)
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{
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struct minimal_symbol *sym;
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sym = lookup_minimal_symbol (name, NULL, NULL);
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if (sym == NULL)
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error ("kernel symbol `%s' not found.", name);
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return SYMBOL_VALUE_ADDRESS (sym);
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}
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/* Provide the address of an initial PCB to use.
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If this is a crash dump, try for "dumppcb".
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If no "dumppcb" or it's /dev/mem, use proc0.
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Return the core address of the PCB we found. */
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static CORE_ADDR
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initial_pcb (void)
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{
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struct minimal_symbol *sym;
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CORE_ADDR addr;
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void *val;
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/* Make sure things are open... */
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if (!core_kd || !core_file)
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return (0);
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/* If this is NOT /dev/mem try for dumppcb. */
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if (strncmp (core_file, _PATH_DEV, sizeof _PATH_DEV - 1))
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{
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sym = lookup_minimal_symbol ("dumppcb", NULL, NULL);
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if (sym != NULL)
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{
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addr = SYMBOL_VALUE_ADDRESS (sym);
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return (addr);
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}
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}
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/* OK, just use thread0's pcb. Note that curproc might
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not exist, and if it does, it will point to gdb.
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Therefore, just use proc0 and let the user set
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some other context if they care about it. */
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addr = ksym_lookup ("thread0");
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if (kvread (addr, &val))
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{
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error ("cannot read thread0 pointer at %x\n", addr);
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val = 0;
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}
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else
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{
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/* Read the PCB address in thread structure. */
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addr += offsetof (struct thread, td_pcb);
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if (kvread (addr, &val))
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{
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error ("cannot read thread0->td_pcb pointer at %x\n", addr);
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val = 0;
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}
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}
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/* thread0 is wholly in the kernel and cur_proc is only used for
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reading user mem, so no point in setting this up. */
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cur_proc = 0;
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return ((CORE_ADDR)val);
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}
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/* Set the current context to that of the PCB struct at the system address
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passed. */
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static int
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set_context (CORE_ADDR addr)
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{
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CORE_ADDR procaddr = 0;
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if (kvread (addr, &cur_pcb))
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error ("cannot read pcb at %#x", addr);
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/* Fetch all registers from core file. */
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target_fetch_registers (-1);
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/* Now, set up the frame cache, and print the top of stack. */
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flush_cached_frames ();
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set_current_frame (create_new_frame (read_fp (), read_pc ()));
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select_frame (get_current_frame (), 0);
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return (0);
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}
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/* Discard all vestiges of any previous core file and mark data and stack
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spaces as empty. */
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/* ARGSUSED */
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static void
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kcore_close (int quitting)
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{
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inferior_ptid = null_ptid; /* Avoid confusion from thread stuff. */
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if (core_kd)
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{
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kvm_close (core_kd);
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free (core_file);
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core_file = NULL;
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core_kd = NULL;
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}
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}
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/* This routine opens and sets up the core file bfd. */
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static void
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kcore_open (char *filename /* the core file */, int from_tty)
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{
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kvm_t *kd;
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const char *p;
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struct cleanup *old_chain;
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char buf[256], *cp;
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int ontop;
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CORE_ADDR addr;
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target_preopen (from_tty);
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/* The exec file is required for symbols. */
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if (exec_bfd == NULL)
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error ("No kernel exec file specified");
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if (core_kd)
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{
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error ("No core file specified."
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" (Use `detach' to stop debugging a core file.)");
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return;
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}
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if (!filename)
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{
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error ("No core file specified.");
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return;
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}
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filename = tilde_expand (filename);
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if (filename[0] != '/')
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{
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cp = concat (current_directory, "/", filename, NULL);
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free (filename);
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filename = cp;
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}
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old_chain = make_cleanup (free, filename);
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kd = kvm_open (bfd_get_filename(exec_bfd), filename, NULL,
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kernel_writablecore ? O_RDWR: O_RDONLY, 0);
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if (kd == NULL)
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{
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perror_with_name (filename);
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return;
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}
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/* Looks semi-reasonable. Toss the old core file and work on the new. */
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discard_cleanups (old_chain); /* Don't free filename any more. */
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core_file = filename;
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unpush_target (&kcore_ops);
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ontop = !push_target (&kcore_ops);
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/* Note unpush_target (above) calls kcore_close. */
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core_kd = kd;
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/* Print out the panic string if there is one. */
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if (kvread (ksym_lookup ("panicstr"), &addr) == 0 &&
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addr != 0 &&
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target_read_memory (addr, buf, sizeof(buf)) == 0)
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{
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for (cp = buf; cp < &buf[sizeof(buf)] && *cp; cp++)
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if (!isascii (*cp) || (!isprint (*cp) && !isspace (*cp)))
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*cp = '?';
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*cp = '\0';
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if (buf[0] != '\0')
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printf_filtered ("panic: %s\n", buf);
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}
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/* Print all the panic messages if possible. */
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if (symfile_objfile != NULL)
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{
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printf ("panic messages:\n---\n");
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snprintf (buf, sizeof buf,
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"/sbin/dmesg -N %s -M %s | \
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/usr/bin/awk '/^(panic:|Fatal trap) / { printing = 1 } \
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{ if (printing) print $0 }'",
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symfile_objfile->name, filename);
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fflush (stdout);
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system (buf);
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printf ("---\n");
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}
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if (!ontop)
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{
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warning ("you won't be able to access this core file until you terminate\n"
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"your %s; do ``info files''", target_longname);
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return;
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}
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/* Now, set up process context, and print the top of stack. */
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(void)set_context (initial_pcb());
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print_stack_frame (selected_frame, selected_frame_level, 1);
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}
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static void
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kcore_detach (char *args, int from_tty)
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{
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if (args)
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error ("Too many arguments");
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unpush_target (&kcore_ops);
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reinit_frame_cache ();
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if (from_tty)
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printf_filtered ("No kernel core file now.\n");
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}
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#ifdef __alpha__
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#include "alpha/tm-alpha.h"
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#ifndef S0_REGNUM
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#define S0_REGNUM (T7_REGNUM+1)
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#endif
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fetch_kcore_registers (struct pcb *pcbp)
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{
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/* First clear out any garbage. */
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memset (registers, '\0', REGISTER_BYTES);
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/* SP */
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*(long *) ®isters[REGISTER_BYTE (SP_REGNUM)] =
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pcbp->pcb_hw.apcb_ksp;
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/* S0 through S6 */
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memcpy (®isters[REGISTER_BYTE (S0_REGNUM)],
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&pcbp->pcb_context[0], 7 * sizeof (long));
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/* PC */
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*(long *) ®isters[REGISTER_BYTE (PC_REGNUM)] =
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pcbp->pcb_context[7];
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registers_fetched ();
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}
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CORE_ADDR
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fbsd_kern_frame_saved_pc (struct frame_info *fi)
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{
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struct minimal_symbol *sym;
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CORE_ADDR this_saved_pc;
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this_saved_pc = alpha_frame_saved_pc (fi);
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sym = lookup_minimal_symbol_by_pc (this_saved_pc);
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if (sym != NULL &&
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(strcmp (SYMBOL_NAME (sym), "XentArith") == 0 ||
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strcmp (SYMBOL_NAME (sym), "XentIF") == 0 ||
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strcmp (SYMBOL_NAME (sym), "XentInt") == 0 ||
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strcmp (SYMBOL_NAME (sym), "XentMM") == 0 ||
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strcmp (SYMBOL_NAME (sym), "XentSys") == 0 ||
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strcmp (SYMBOL_NAME (sym), "XentUna") == 0 ||
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strcmp (SYMBOL_NAME (sym), "XentRestart") == 0))
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{
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return (read_memory_integer (fi->frame + 32 * 8, 8));
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}
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else
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{
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return (this_saved_pc);
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}
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}
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#endif /* __alpha__ */
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#ifdef __i386__
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static CORE_ADDR
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ksym_maxuseraddr (void)
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{
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static CORE_ADDR maxuseraddr;
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struct minimal_symbol *sym;
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if (maxuseraddr == 0)
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{
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sym = lookup_minimal_symbol ("PTmap", NULL, NULL);
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if (sym == NULL) {
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maxuseraddr = VM_MAXUSER_ADDRESS;
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} else {
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maxuseraddr = SYMBOL_VALUE_ADDRESS (sym);
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}
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}
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return maxuseraddr;
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}
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/* Symbol names of kernel entry points. Use special frames. */
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#define KSYM_TRAP "calltrap"
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#define KSYM_INTR "Xintr"
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#define KSYM_FASTINTR "Xfastintr"
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#define KSYM_OLDSYSCALL "Xlcall_syscall"
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#define KSYM_SYSCALL "Xint0x80_syscall"
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/* The following is FreeBSD-specific hackery to decode special frames
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and elide the assembly-language stub. This could be made faster by
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defining a frame_type field in the machine-dependent frame information,
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but we don't think that's too important right now. */
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enum frametype { tf_normal, tf_trap, tf_interrupt, tf_syscall };
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CORE_ADDR
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fbsd_kern_frame_saved_pc (struct frame_info *fr)
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{
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struct minimal_symbol *sym;
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CORE_ADDR this_saved_pc;
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enum frametype frametype;
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this_saved_pc = read_memory_integer (fr->frame + 4, 4);
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sym = lookup_minimal_symbol_by_pc (this_saved_pc);
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frametype = tf_normal;
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if (sym != NULL)
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{
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if (strcmp (SYMBOL_NAME (sym), KSYM_TRAP) == 0)
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frametype = tf_trap;
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else
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if (strncmp (SYMBOL_NAME (sym), KSYM_INTR,
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strlen (KSYM_INTR)) == 0 || strncmp (SYMBOL_NAME(sym),
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KSYM_FASTINTR, strlen (KSYM_FASTINTR)) == 0)
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frametype = tf_interrupt;
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else
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if (strcmp (SYMBOL_NAME (sym), KSYM_SYSCALL) == 0 ||
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strcmp (SYMBOL_NAME (sym), KSYM_OLDSYSCALL) == 0)
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frametype = tf_syscall;
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}
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switch (frametype)
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{
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case tf_normal:
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return (this_saved_pc);
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#define oEIP offsetof (struct trapframe, tf_eip)
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case tf_trap:
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return (read_memory_integer (fr->frame + 8 + oEIP, 4));
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case tf_interrupt:
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return (read_memory_integer (fr->frame + 12 + oEIP, 4));
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case tf_syscall:
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return (read_memory_integer (fr->frame + 8 + oEIP, 4));
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#undef oEIP
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}
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}
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static int
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fetch_kcore_registers (struct pcb *pcb)
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{
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int i;
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int noreg;
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/* Get the register values out of the sys pcb and store them where
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`read_register' will find them. */
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/*
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* XXX many registers aren't available.
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* XXX for the non-core case, the registers are stale - they are for
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* the last context switch to the debugger.
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* XXX gcc's register numbers aren't all #defined in tm-i386.h.
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*/
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noreg = 0;
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for (i = 0; i < 3; ++i) /* eax,ecx,edx */
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supply_register (i, (char *)&noreg);
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supply_register (3, (char *) &pcb->pcb_ebx);
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supply_register (SP_REGNUM, (char *) &pcb->pcb_esp);
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supply_register (FP_REGNUM, (char *) &pcb->pcb_ebp);
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supply_register (6, (char *) &pcb->pcb_esi);
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supply_register (7, (char *) &pcb->pcb_edi);
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supply_register (PC_REGNUM, (char *) &pcb->pcb_eip);
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for (i = 9; i < 14; ++i) /* eflags, cs, ss, ds, es, fs */
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supply_register (i, (char *) &noreg);
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supply_register (15, (char *) &pcb->pcb_gs);
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/* XXX 80387 registers? */
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}
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#endif /* __i386__ */
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#ifdef __sparc64__
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/*
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#include "sparc/tm-sp64.h"
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*/
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fetch_kcore_registers (struct pcb *pcbp)
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{
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}
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CORE_ADDR
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fbsd_kern_frame_saved_pc (struct frame_info *fi)
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{
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return NULL;
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}
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#endif /* __sparc64__ */
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/* Get the registers out of a core file. This is the machine-
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independent part. Fetch_core_registers is the machine-dependent
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part, typically implemented in the xm-file for each architecture. */
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/* We just get all the registers, so we don't use regno. */
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/* ARGSUSED */
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static void
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get_kcore_registers (int regno)
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{
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/* XXX - Only read the pcb when set_context() is called.
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When looking at a live kernel this may be a problem,
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but the user can do another "proc" or "pcb" command to
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grab a new copy of the pcb... */
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/* Zero out register set then fill in the ones we know about. */
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fetch_kcore_registers (&cur_pcb);
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}
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static void
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kcore_files_info (t)
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struct target_ops *t;
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{
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printf_filtered ("\t`%s'\n", core_file);
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}
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/* If mourn is being called in all the right places, this could be say
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`gdb internal error' (since generic_mourn calls breakpoint_init_inferior). */
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||
|
||
static int
|
||
ignore (CORE_ADDR addr, char *contents)
|
||
{
|
||
return 0;
|
||
}
|
||
|
||
static int
|
||
xfer_kmem (CORE_ADDR memaddr, char *myaddr, int len, int write,
|
||
struct target_ops *target)
|
||
{
|
||
int n;
|
||
|
||
|
||
if (!INKERNEL (memaddr))
|
||
return xfer_umem (memaddr, myaddr, len, write);
|
||
|
||
if (core_kd == NULL)
|
||
return 0;
|
||
|
||
if (write)
|
||
n = kvm_write (core_kd, memaddr, myaddr, len);
|
||
else
|
||
n = kvm_read (core_kd, memaddr, myaddr, len) ;
|
||
if (n < 0) {
|
||
fprintf_unfiltered (gdb_stderr, "can not access 0x%x, %s\n",
|
||
memaddr, kvm_geterr (core_kd));
|
||
n = 0;
|
||
}
|
||
|
||
return n;
|
||
}
|
||
|
||
|
||
static int
|
||
xfer_umem (CORE_ADDR memaddr, char *myaddr, int len, int write /* ignored */)
|
||
{
|
||
int n = 0;
|
||
|
||
if (cur_proc == 0)
|
||
{
|
||
error ("---Can't read userspace from dump, or kernel process---\n");
|
||
return 0;
|
||
}
|
||
|
||
if (write)
|
||
error ("kvm_uwrite unimplemented\n");
|
||
else
|
||
n = kvm_uread (core_kd, cur_proc, memaddr, myaddr, len) ;
|
||
|
||
if (n < 0)
|
||
return 0;
|
||
|
||
return n;
|
||
}
|
||
|
||
static void
|
||
set_proc_cmd (char *arg)
|
||
{
|
||
CORE_ADDR addr, pid_addr, first_td;
|
||
void *val;
|
||
struct kinfo_proc *kp;
|
||
int cnt;
|
||
pid_t pid;
|
||
|
||
if (!arg)
|
||
error_no_arg ("proc address for the new context");
|
||
|
||
if (core_kd == NULL)
|
||
error ("no kernel core file");
|
||
|
||
addr = (CORE_ADDR) parse_and_eval_address (arg);
|
||
|
||
if (!INKERNEL (addr))
|
||
{
|
||
kp = kvm_getprocs (core_kd, KERN_PROC_PID, addr, &cnt);
|
||
if (!cnt)
|
||
error ("invalid pid");
|
||
addr = (CORE_ADDR)kp->ki_paddr;
|
||
cur_proc = kp;
|
||
}
|
||
else
|
||
{
|
||
/* Update cur_proc. */
|
||
pid_addr = addr + offsetof (struct proc, p_pid);
|
||
if (kvread (pid_addr, &pid))
|
||
error ("cannot read pid ptr");
|
||
cur_proc = kvm_getprocs (core_kd, KERN_PROC_PID, pid, &cnt);
|
||
if (!cnt)
|
||
error("invalid pid");
|
||
}
|
||
|
||
/* Find the first thread in the process. XXXKSE */
|
||
addr += offsetof (struct proc, p_threads.tqh_first);
|
||
if (kvread (addr, &first_td))
|
||
error ("cannot read thread ptr");
|
||
|
||
/* Read the PCB address in thread structure. */
|
||
addr = first_td + offsetof (struct thread, td_pcb);
|
||
if (kvread (addr, &val))
|
||
error("cannot read pcb ptr");
|
||
|
||
/* Read the PCB address in proc structure. */
|
||
if (set_context ((CORE_ADDR) val))
|
||
error ("invalid proc address");
|
||
}
|
||
|
||
void
|
||
_initialize_kcorelow (void)
|
||
{
|
||
kcore_ops.to_shortname = "kcore";
|
||
kcore_ops.to_longname = "Kernel core dump file";
|
||
kcore_ops.to_doc =
|
||
"Use a core file as a target. Specify the filename of the core file.";
|
||
kcore_ops.to_open = kcore_open;
|
||
kcore_ops.to_close = kcore_close;
|
||
kcore_ops.to_attach = find_default_attach;
|
||
kcore_ops.to_detach = kcore_detach;
|
||
kcore_ops.to_fetch_registers = get_kcore_registers;
|
||
kcore_ops.to_xfer_memory = xfer_kmem;
|
||
kcore_ops.to_files_info = kcore_files_info;
|
||
kcore_ops.to_create_inferior = find_default_create_inferior;
|
||
kcore_ops.to_stratum = kcore_stratum;
|
||
kcore_ops.to_has_memory = 1;
|
||
kcore_ops.to_has_stack = 1;
|
||
kcore_ops.to_has_registers = 1;
|
||
kcore_ops.to_magic = OPS_MAGIC;
|
||
|
||
add_target (&kcore_ops);
|
||
add_com ("proc", class_obscure, set_proc_cmd, "Set current process context");
|
||
}
|