Attachment 36647 Details for Bug 58655 – file.diff

[patch] file.diff

file.diff (text/plain), 19.73 KB, created by John R.Shannon on 2003-10-28 23:00:24 UTC

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Creator: John R.Shannon

Created: 2003-10-28 23:00:24 UTC

Size: 19.73 KB

patch

obsolete

>--- gdb/kvm-fbsd.c	Fri Jan  3 08:57:23 2003
>+++ gdb/kvm-fbsd.c	Fri Jan  3 08:57:20 2003
>@@ -0,0 +1,756 @@
>+/* Kernel core dump functions below target vector, for GDB.
>+   Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1995
>+   Free Software Foundation, Inc.
>+
>+This file is part of GDB.
>+
>+This program is free software; you can redistribute it and/or modify
>+it under the terms of the GNU General Public License as published by
>+the Free Software Foundation; either version 2 of the License, or
>+(at your option) any later version.
>+
>+This program is distributed in the hope that it will be useful,
>+but WITHOUT ANY WARRANTY; without even the implied warranty of
>+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>+GNU General Public License for more details.
>+
>+You should have received a copy of the GNU General Public License
>+along with this program; if not, write to the Free Software
>+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
>+*/
>+
>+/* $FreeBSD: ports/devel/gdb53-act/files/patch-gdb_kvm-fbsd.c,v 1.1 2003/09/27 07:38:23 edwin Exp $ */
>+
>+/*
>+ * This works like "remote" but, you use it like this:
>+ *     target kcore /dev/mem
>+ * or
>+ *     target kcore /var/crash/host/core.0
>+ *
>+ * This way makes it easy to short-circut the whole bfd monster,
>+ * and direct the inferior stuff to our libkvm implementation.
>+ *
>+ */
>+
>+#include <sys/param.h>
>+#include <sys/time.h>
>+#include <sys/proc.h>
>+#include <sys/user.h>
>+#include <ctype.h>
>+#include <errno.h>
>+#include <signal.h>
>+#include <fcntl.h>
>+#include <kvm.h>
>+#include <sys/sysctl.h>
>+#include <paths.h>
>+#include <readline/tilde.h>
>+#include <machine/frame.h>
>+
>+#include "defs.h"
>+#include "gdb_string.h"
>+#include "frame.h"  /* required by inferior.h */
>+#include "inferior.h"
>+#include "symtab.h"
>+#include "symfile.h"
>+#include "objfiles.h"
>+#include "command.h"
>+#include "bfd.h"
>+#include "target.h"
>+#include "gdbcore.h"
>+#include "regcache.h"
>+
>+#if __FreeBSD_version >= 500032
>+static void
>+kcore_files_info (struct target_ops *);
>+
>+static void
>+kcore_close (int);
>+
>+static void
>+get_kcore_registers (int);
>+
>+static int
>+xfer_mem (CORE_ADDR, char *, int, int, struct mem_attrib *,
>+          struct target_ops *);
>+
>+static int
>+xfer_umem (CORE_ADDR, char *, int, int);
>+
>+static char		*core_file;
>+static kvm_t		*core_kd;
>+static struct pcb	cur_pcb;
>+static struct kinfo_proc *cur_proc;
>+
>+static struct target_ops kcore_ops;
>+
>+int kernel_debugging;
>+int kernel_writablecore;
>+
>+/* Read the "thing" at kernel address 'addr' into the space pointed to
>+   by point.  The length of the "thing" is determined by the type of p.
>+   Result is non-zero if transfer fails.  */
>+
>+#define kvread(addr, p) \
>+  (target_read_memory ((CORE_ADDR) (addr), (char *) (p), sizeof (*(p))))
>+
>+static CORE_ADDR
>+ksym_kernbase (void)
>+{
>+  static CORE_ADDR kernbase;
>+  struct minimal_symbol *sym;
>+
>+  if (kernbase == 0)
>+    {
>+      sym = lookup_minimal_symbol ("kernbase", NULL, NULL);
>+      if (sym == NULL) {
>+	kernbase = KERNBASE;
>+      } else {
>+	kernbase = SYMBOL_VALUE_ADDRESS (sym);
>+      }
>+    }
>+  return kernbase;
>+}
>+
>+#define	KERNOFF		(ksym_kernbase ())
>+#define	INKERNEL(x)	((x) >= KERNOFF)
>+
>+CORE_ADDR
>+ksym_lookup(const char *name)
>+{
>+  struct minimal_symbol *sym;
>+
>+  sym = lookup_minimal_symbol (name, NULL, NULL);
>+  if (sym == NULL)
>+    error ("kernel symbol `%s' not found.", name);
>+
>+  return SYMBOL_VALUE_ADDRESS (sym);
>+}
>+
>+/* Provide the address of an initial PCB to use.
>+   If this is a crash dump, try for "dumppcb".
>+   If no "dumppcb" or it's /dev/mem, use proc0.
>+   Return the core address of the PCB we found.  */
>+
>+static CORE_ADDR
>+initial_pcb (void)
>+{
>+  struct minimal_symbol *sym;
>+  CORE_ADDR addr;
>+  void *val;
>+
>+  /* Make sure things are open...  */
>+  if (!core_kd || !core_file)
>+    return (0);
>+
>+  /* If this is NOT /dev/mem try for dumppcb.  */
>+  if (strncmp (core_file, _PATH_DEV, sizeof _PATH_DEV - 1))
>+    {
>+      sym = lookup_minimal_symbol ("dumppcb", NULL, NULL);
>+      if (sym != NULL)
>+	{
>+	  addr = SYMBOL_VALUE_ADDRESS (sym);
>+	  return (addr);
>+	}
>+  }
>+
>+  /* OK, just use thread0's pcb.  Note that curproc might
>+     not exist, and if it does, it will point to gdb.
>+     Therefore, just use proc0 and let the user set
>+     some other context if they care about it.  */
>+
>+  addr = ksym_lookup ("thread0");
>+  if (kvread (addr, &val))
>+    {
>+      error ("cannot read thread0 pointer at %x\n", addr);
>+      val = 0;
>+    }
>+  else
>+    {
>+      /* Read the PCB address in thread structure.  */
>+      addr += offsetof (struct thread, td_pcb);
>+      if (kvread (addr, &val))
>+	{
>+	  error ("cannot read thread0->td_pcb pointer at %x\n", addr);
>+	  val = 0;
>+	}
>+    }
>+
>+  /* thread0 is wholly in the kernel and cur_proc is only used for
>+     reading user mem, so no point in setting this up.  */
>+  cur_proc = 0;
>+
>+  return ((CORE_ADDR)val);
>+}
>+
>+/* Set the current context to that of the PCB struct at the system address
>+   passed.  */
>+
>+static int
>+set_context (CORE_ADDR addr)
>+{
>+  CORE_ADDR procaddr = 0;
>+
>+  if (kvread (addr, &cur_pcb))
>+    error ("cannot read pcb at %#x", addr);
>+
>+  /* Fetch all registers from core file.  */
>+  target_fetch_registers (-1);
>+
>+  /* Now, set up the frame cache, and print the top of stack.  */
>+  flush_cached_frames ();
>+  set_current_frame (create_new_frame (read_fp (), read_pc ()));
>+  select_frame (get_current_frame ());
>+  return (0);
>+}
>+
>+/* Discard all vestiges of any previous core file and mark data and stack
>+   spaces as empty.  */
>+
>+/* ARGSUSED */
>+static void
>+kcore_close (int quitting)
>+{
>+
>+  inferior_ptid = null_ptid;	/* Avoid confusion from thread stuff.  */
>+
>+  if (core_kd)
>+    {
>+      kvm_close (core_kd);
>+      free (core_file);
>+      core_file = NULL;
>+      core_kd = NULL;
>+    }
>+}
>+
>+/* This routine opens and sets up the core file bfd.  */
>+
>+static void
>+kcore_open (char *filename /* the core file */, int from_tty)
>+{
>+  kvm_t *kd;
>+  const char *p;
>+  struct cleanup *old_chain;
>+  char buf[256], *cp;
>+  int ontop;
>+  CORE_ADDR addr;
>+
>+  target_preopen (from_tty);
>+
>+  /* The exec file is required for symbols.  */
>+  if (exec_bfd == NULL)
>+    error ("No kernel exec file specified");
>+
>+  if (core_kd)
>+    {
>+      error ("No core file specified."
>+	     "  (Use `detach' to stop debugging a core file.)");
>+      return;
>+    }
>+
>+  if (!filename)
>+    {
>+      error ("No core file specified.");
>+      return;
>+    }
>+
>+  filename = tilde_expand (filename);
>+  if (filename[0] != '/')
>+    {
>+      cp = concat (current_directory, "/", filename, NULL);
>+      free (filename);
>+      filename = cp;
>+    }
>+
>+  old_chain = make_cleanup (free, filename);
>+
>+  kd = kvm_open (bfd_get_filename(exec_bfd), filename, NULL,
>+		 kernel_writablecore ? O_RDWR: O_RDONLY, 0);
>+  if (kd == NULL)
>+    {
>+      perror_with_name (filename);
>+      return;
>+    }
>+
>+  /* Looks semi-reasonable.  Toss the old core file and work on the new.  */
>+
>+  discard_cleanups (old_chain);		/* Don't free filename any more.  */
>+  core_file = filename;
>+  unpush_target (&kcore_ops);
>+  ontop = !push_target (&kcore_ops);
>+
>+  /* Note unpush_target (above) calls kcore_close.  */
>+  core_kd = kd;
>+
>+  /* Print out the panic string if there is one.  */
>+  if (kvread (ksym_lookup ("panicstr"), &addr) == 0 &&
>+      addr != 0 && 
>+      target_read_memory (addr, buf, sizeof(buf)) == 0)
>+    {
>+
>+      for (cp = buf; cp < &buf[sizeof(buf)] && *cp; cp++)
>+	if (!isascii (*cp) || (!isprint (*cp) && !isspace (*cp)))
>+	  *cp = '?';
>+      *cp = '\0';
>+      if (buf[0] != '\0')
>+	printf_filtered ("panic: %s\n", buf);
>+    }
>+
>+  /* Print all the panic messages if possible.  */
>+  if (symfile_objfile != NULL)
>+    {
>+      printf ("panic messages:\n---\n");
>+      snprintf (buf, sizeof buf,
>+                "/sbin/dmesg -N %s -M %s | \
>+                 /usr/bin/awk '/^(panic:|Fatal trap) / { printing = 1 } \
>+                               { if (printing) print $0 }'",
>+                symfile_objfile->name, filename);
>+      fflush (stdout);
>+      system (buf);
>+      printf ("---\n");
>+    }
>+
>+  if (!ontop)
>+    {
>+      warning ("you won't be able to access this core file until you terminate\n"
>+		"your %s; do ``info files''", target_longname);
>+      return;
>+    }
>+
>+  /* Now, set up process context, and print the top of stack.  */
>+  (void)set_context (initial_pcb());
>+  print_stack_frame (selected_frame, frame_relative_level(selected_frame), 1);
>+}
>+
>+static void
>+kcore_detach (char *args, int from_tty)
>+{
>+  if (args)
>+    error ("Too many arguments");
>+  unpush_target (&kcore_ops);
>+  reinit_frame_cache ();
>+  if (from_tty)
>+    printf_filtered ("No kernel core file now.\n");
>+}
>+
>+#ifdef __alpha__
>+
>+#include "alpha/tm-alpha.h"
>+#include "alpha-tdep.h"
>+
>+#ifndef S0_REGNUM
>+#define S0_REGNUM (ALPHA_T7_REGNUM+1)
>+#endif
>+
>+fetch_kcore_registers (struct pcb *pcbp)
>+{
>+
>+  /* First clear out any garbage.  */
>+  memset (registers, '\0', REGISTER_BYTES);
>+
>+  /* SP */
>+  *(long *) &registers[REGISTER_BYTE (SP_REGNUM)] =
>+    pcbp->pcb_hw.apcb_ksp;
>+
>+  /* S0 through S6 */
>+  memcpy (&registers[REGISTER_BYTE (S0_REGNUM)],
>+          &pcbp->pcb_context[0], 7 * sizeof (long));
>+
>+  /* PC */
>+  *(long *) &registers[REGISTER_BYTE (PC_REGNUM)] =
>+    pcbp->pcb_context[7];
>+
>+  registers_fetched ();
>+}
>+
>+
>+CORE_ADDR
>+fbsd_kern_frame_saved_pc (struct frame_info *fi)
>+{
>+  struct minimal_symbol *sym;
>+  CORE_ADDR this_saved_pc;
>+
>+  this_saved_pc = FRAME_SAVED_PC(fi);
>+
>+  sym = lookup_minimal_symbol_by_pc (this_saved_pc);
>+
>+  if (sym != NULL &&
>+      (strcmp (SYMBOL_NAME (sym), "XentArith") == 0 ||
>+       strcmp (SYMBOL_NAME (sym), "XentIF") == 0 ||
>+       strcmp (SYMBOL_NAME (sym), "XentInt") == 0 ||
>+       strcmp (SYMBOL_NAME (sym), "XentMM") == 0 ||
>+       strcmp (SYMBOL_NAME (sym), "XentSys") == 0 ||
>+       strcmp (SYMBOL_NAME (sym), "XentUna") == 0 ||
>+       strcmp (SYMBOL_NAME (sym), "XentRestart") == 0))
>+    {
>+      return (read_memory_integer (fi->frame + 32 * 8, 8));
>+    }
>+  else
>+    {
>+      return (this_saved_pc);
>+    }
>+}
>+
>+#endif /* __alpha__ */
>+
>+#ifdef __i386__
>+
>+static CORE_ADDR
>+ksym_maxuseraddr (void)
>+{
>+  static CORE_ADDR maxuseraddr;
>+  struct minimal_symbol *sym;
>+
>+  if (maxuseraddr == 0)
>+    {
>+      sym = lookup_minimal_symbol ("PTmap", NULL, NULL);
>+      if (sym == NULL) {
>+	maxuseraddr = VM_MAXUSER_ADDRESS;
>+      } else {
>+	maxuseraddr = SYMBOL_VALUE_ADDRESS (sym);
>+      }
>+    }
>+  return maxuseraddr;
>+}
>+
>+
>+/* Symbol names of kernel entry points.  Use special frames.  */
>+#define	KSYM_TRAP	"calltrap"
>+#define	KSYM_INTR	"Xintr"
>+#define	KSYM_FASTINTR	"Xfastintr"
>+#define	KSYM_OLDSYSCALL	"Xlcall_syscall"
>+#define	KSYM_SYSCALL	"Xint0x80_syscall"
>+
>+/* The following is FreeBSD-specific hackery to decode special frames
>+   and elide the assembly-language stub.  This could be made faster by
>+   defining a frame_type field in the machine-dependent frame information,
>+   but we don't think that's too important right now.  */
>+enum frametype { tf_normal, tf_trap, tf_interrupt, tf_syscall };
>+
>+CORE_ADDR
>+fbsd_kern_frame_saved_pc (struct frame_info *fr)
>+{
>+  struct minimal_symbol *sym;
>+  CORE_ADDR this_saved_pc;
>+  enum frametype frametype;
>+
>+  this_saved_pc = read_memory_integer (fr->frame + 4, 4);
>+  sym = lookup_minimal_symbol_by_pc (this_saved_pc);
>+  frametype = tf_normal;
>+  if (sym != NULL)
>+    {
>+      if (strcmp (SYMBOL_NAME (sym), KSYM_TRAP) == 0)
>+	frametype = tf_trap;
>+      else
>+	if (strncmp (SYMBOL_NAME (sym), KSYM_INTR,
>+	    strlen (KSYM_INTR)) == 0 || strncmp (SYMBOL_NAME(sym),
>+	    KSYM_FASTINTR, strlen (KSYM_FASTINTR)) == 0)
>+	  frametype = tf_interrupt;
>+      else
>+	if (strcmp (SYMBOL_NAME (sym), KSYM_SYSCALL) == 0 ||
>+	    strcmp (SYMBOL_NAME (sym), KSYM_OLDSYSCALL) == 0)
>+	  frametype = tf_syscall;
>+    }
>+
>+  switch (frametype)
>+    {
>+      default:
>+      case tf_normal:
>+        return (this_saved_pc);
>+#define oEIP   offsetof (struct trapframe, tf_eip)
>+
>+      case tf_trap:
>+	return (read_memory_integer (fr->frame + 8 + oEIP, 4));
>+
>+      case tf_interrupt:
>+	return (read_memory_integer (fr->frame + 12 + oEIP, 4));
>+
>+      case tf_syscall:
>+	return (read_memory_integer (fr->frame + 8 + oEIP, 4));
>+#undef oEIP
>+    }
>+}
>+
>+static void
>+fetch_kcore_registers (struct pcb *pcb)
>+{
>+  int i;
>+  int noreg;
>+
>+  /* Get the register values out of the sys pcb and store them where
>+     `read_register' will find them.  */
>+  /*
>+   * XXX many registers aren't available.
>+   * XXX for the non-core case, the registers are stale - they are for
>+   *     the last context switch to the debugger.
>+   * XXX gcc's register numbers aren't all #defined in tm-i386.h.
>+   */
>+  noreg = 0;
>+  for (i = 0; i < 3; ++i)		/* eax,ecx,edx */
>+    supply_register (i, (char *)&noreg);
>+
>+  supply_register (3, (char *) &pcb->pcb_ebx);
>+  supply_register (SP_REGNUM, (char *) &pcb->pcb_esp);
>+  supply_register (FP_REGNUM, (char *) &pcb->pcb_ebp);
>+  supply_register (6, (char *) &pcb->pcb_esi);
>+  supply_register (7, (char *) &pcb->pcb_edi);
>+  supply_register (PC_REGNUM, (char *) &pcb->pcb_eip);
>+
>+  for (i = 9; i < 14; ++i)		/* eflags, cs, ss, ds, es, fs */
>+    supply_register (i, (char *) &noreg);
>+  supply_register (15, (char *) &pcb->pcb_gs);
>+
>+  /* XXX 80387 registers?  */
>+}
>+
>+#endif /* __i386__ */
>+
>+#ifdef __sparc64__
>+
>+#define	SPARC_INTREG_SIZE	8
>+
>+static void
>+fetch_kcore_registers (struct pcb *pcbp)
>+{
>+  static struct frame top;
>+  CORE_ADDR f_addr;
>+  int i;
>+
>+  /* Get the register values out of the sys pcb and store them where
>+     `read_register' will find them.  */
>+  /*
>+   * XXX many registers aren't available.
>+   * XXX for the non-core case, the registers are stale - they are for
>+   *     the last context switch to the debugger.
>+   * XXX do something with the floating-point registers?
>+   */
>+  supply_register (SP_REGNUM, &pcbp->pcb_sp);
>+  supply_register (PC_REGNUM, &pcbp->pcb_pc);
>+  f_addr = extract_address (&pcbp->pcb_sp, SPARC_INTREG_SIZE);
>+  /* Load the previous frame by hand (XXX) and supply it. */
>+  read_memory (f_addr + SPOFF, (char *)&top, sizeof (top));
>+  for (i = 0; i < 8; i++)
>+    supply_register (i + L0_REGNUM, &top.fr_local[i]);
>+  for (i = 0; i < 8; i++)
>+    supply_register (i + I0_REGNUM, &top.fr_in[i]);
>+}
>+
>+CORE_ADDR
>+fbsd_kern_frame_saved_pc (struct frame_info *fi)
>+{
>+  struct minimal_symbol *sym;
>+  CORE_ADDR frame, pc_addr, pc;
>+  char *buf;
>+
>+  buf = alloca (MAX_REGISTER_RAW_SIZE);
>+  /* XXX: duplicates fi->extra_info->bottom. */
>+  frame = (fi->next != NULL) ? fi->next->frame : read_sp ();
>+  pc_addr = frame + offsetof (struct frame, fr_in[7]);
>+
>+#define	READ_PC(pc, a, b) do { \
>+  read_memory (a, b, SPARC_INTREG_SIZE); \
>+  pc = extract_address (b, SPARC_INTREG_SIZE); \
>+} while (0)
>+
>+  READ_PC (pc, pc_addr, buf);
>+
>+  sym = lookup_minimal_symbol_by_pc (pc);
>+  if (sym != NULL)
>+    {
>+      if (strncmp (SYMBOL_NAME (sym), "tl0_", 4) == 0 ||
>+	  strcmp (SYMBOL_NAME (sym), "btext") == 0 ||
>+	  strcmp (SYMBOL_NAME (sym), "mp_startup") == 0 ||
>+	  strcmp (SYMBOL_NAME (sym), "fork_trampoline") == 0)
>+        {
>+	  /*
>+	   * Ugly kluge: user space addresses aren't separated from kernel
>+	   * ones by range; if encountering a trap from user space, just
>+	   * return a 0 to stop the trace.
>+	   * Do the same for entry points of kernel processes to avoid
>+	   * printing garbage.
>+	   */
>+	  pc = 0;
>+        }
>+      if (strncmp (SYMBOL_NAME (sym), "tl1_", 4) == 0)
>+        {
>+          pc_addr = fi->frame + sizeof (struct frame) +
>+	    offsetof (struct trapframe, tf_tpc);
>+          READ_PC (pc, pc_addr, buf);
>+	}
>+    }
>+  return (pc);
>+}
>+
>+#endif /* __sparc64__ */
>+
>+/* Get the registers out of a core file.  This is the machine-
>+   independent part.  Fetch_core_registers is the machine-dependent
>+   part, typically implemented in the xm-file for each architecture.  */
>+
>+/* We just get all the registers, so we don't use regno.  */
>+
>+/* ARGSUSED */
>+static void
>+get_kcore_registers (int regno)
>+{
>+
>+  /* XXX - Only read the pcb when set_context() is called.
>+     When looking at a live kernel this may be a problem,
>+     but the user can do another "proc" or "pcb" command to
>+     grab a new copy of the pcb...  */
>+
>+  /* Zero out register set then fill in the ones we know about.  */
>+  fetch_kcore_registers (&cur_pcb);
>+}
>+
>+static void
>+kcore_files_info (t)
>+  struct target_ops *t;
>+{
>+  printf_filtered ("\t`%s'\n", core_file);
>+}
>+
>+/* If mourn is being called in all the right places, this could be say
>+   `gdb internal error' (since generic_mourn calls breakpoint_init_inferior). */
>+
>+static int
>+ignore (CORE_ADDR addr, char *contents)
>+{
>+  return 0;
>+}
>+
>+static int
>+xfer_kmem (CORE_ADDR memaddr, char *myaddr, int len, int write,
>+	   struct mem_attrib *attrib, 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, int from_tty)
>+{
>+  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");
>+}
>+#else
>+int kernel_debugging = 0;
>+int kernel_writablecore = 0;
>+
>+CORE_ADDR
>+fbsd_kern_frame_saved_pc (struct frame_info *fi)
>+{
>+  return 0;
>+}
>+#endif
>+
>+void
>+_initialize_kcorelow (void)
>+{
>+#if __FreeBSD_version >= 500032
>+  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");
>+#endif
>+}

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Attachments on bug 58655: 36647