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https://github.com/darlinghq/darling-gdb.git
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57ac95b8fc
parse_and_eval_address to u_long before converting it to a pointer type. * i386fbsd-nat.c (_initialize_i386fbsd_nat): Change type of ps_strings from int to u_long. * i386obsd-nat.c (_initialize_i386obsd_nat): Cast _ps.val to u_long instead of CORE_ADDR.
308 lines
7.6 KiB
C
308 lines
7.6 KiB
C
/* BSD Kernel Data Access Library (libkvm) interface.
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Copyright 2004 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 "cli/cli-cmds.h"
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#include "command.h"
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#include "frame.h"
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#include "regcache.h"
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#include "target.h"
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#include "value.h"
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#include "gdbcore.h" /* for get_exec_file */
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#include "gdb_assert.h"
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#include <fcntl.h>
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#include <kvm.h>
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#ifdef HAVE_NLIST_H
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#include <nlist.h>
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#endif
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#include "readline/readline.h"
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#include <sys/param.h>
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#include <sys/proc.h>
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#include <sys/user.h>
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#include "bsd-kvm.h"
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/* Kernel memory interface descriptor. */
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kvm_t *core_kd;
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/* Address of process control block. */
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struct pcb *bsd_kvm_paddr;
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/* Pointer to architecture-specific function that reconstructs the
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register state from PCB and supplies it to REGCACHE. */
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int (*bsd_kvm_supply_pcb)(struct regcache *regcache, struct pcb *pcb);
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/* Target ops for libkvm interface. */
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struct target_ops bsd_kvm_ops;
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static void
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bsd_kvm_open (char *filename, int from_tty)
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{
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char errbuf[_POSIX2_LINE_MAX];
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char *execfile = NULL;
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kvm_t *temp_kd;
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target_preopen (from_tty);
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if (filename)
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{
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char *temp;
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filename = tilde_expand (filename);
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if (filename[0] != '/')
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{
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temp = concat (current_directory, "/", filename, NULL);
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xfree (filename);
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filename = temp;
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}
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}
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execfile = get_exec_file (0);
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temp_kd = kvm_openfiles (execfile, filename, NULL, O_RDONLY, errbuf);
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if (temp_kd == NULL)
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error ("%s", errbuf);
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unpush_target (&bsd_kvm_ops);
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core_kd = temp_kd;
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push_target (&bsd_kvm_ops);
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target_fetch_registers (-1);
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flush_cached_frames ();
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select_frame (get_current_frame ());
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print_stack_frame (get_selected_frame (NULL), -1, 1);
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}
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static void
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bsd_kvm_close (int quitting)
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{
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if (core_kd)
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{
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if (kvm_close (core_kd) == -1)
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warning ("%s", kvm_geterr(core_kd));
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core_kd = NULL;
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}
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}
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static int
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bsd_kvm_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len,
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int write, struct mem_attrib *attrib,
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struct target_ops *ops)
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{
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if (write)
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return kvm_write (core_kd, memaddr, myaddr, len);
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else
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return kvm_read (core_kd, memaddr, myaddr, len);
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return -1;
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}
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/* Fetch process control block at address PADDR. */
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static int
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bsd_kvm_fetch_pcb (struct pcb *paddr)
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{
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struct pcb pcb;
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if (kvm_read (core_kd, (unsigned long) paddr, &pcb, sizeof pcb) == -1)
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error ("%s", kvm_geterr (core_kd));
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gdb_assert (bsd_kvm_supply_pcb);
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return bsd_kvm_supply_pcb (current_regcache, &pcb);
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}
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static void
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bsd_kvm_fetch_registers (int regnum)
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{
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struct nlist nl[2];
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if (bsd_kvm_paddr)
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{
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bsd_kvm_fetch_pcb (bsd_kvm_paddr);
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return;
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}
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/* On dumping core, BSD kernels store the faulting context (PCB)
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in the variable "dumppcb". */
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memset (nl, 0, sizeof nl);
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nl[0].n_name = "_dumppcb";
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if (kvm_nlist (core_kd, nl) == -1)
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error ("%s", kvm_geterr (core_kd));
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if (nl[0].n_value != 0)
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{
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/* Found dumppcb. If it contains a valid context, return
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immediately. */
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if (bsd_kvm_fetch_pcb ((struct pcb *) nl[0].n_value))
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return;
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}
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/* Traditional BSD kernels have a process proc0 that should always
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be present. The address of proc0's PCB is stored in the variable
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"proc0paddr". */
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memset (nl, 0, sizeof nl);
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nl[0].n_name = "_proc0paddr";
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if (kvm_nlist (core_kd, nl) == -1)
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error ("%s", kvm_geterr (core_kd));
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if (nl[0].n_value != 0)
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{
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struct pcb *paddr;
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/* Found proc0paddr. */
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if (kvm_read (core_kd, nl[0].n_value, &paddr, sizeof paddr) == -1)
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error ("%s", kvm_geterr (core_kd));
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bsd_kvm_fetch_pcb (paddr);
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return;
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}
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#ifdef HAVE_STRUCT_THREAD_TD_PCB
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/* In FreeBSD kernels for 5.0-RELEASE and later, the PCB no longer
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lives in `struct proc' but in `struct thread'. The `struct
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thread' for the initial thread for proc0 can be found in the
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variable "thread0". */
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memset (nl, 0, sizeof nl);
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nl[0].n_name = "_thread0";
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if (kvm_nlist (core_kd, nl) == -1)
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error ("%s", kvm_geterr (core_kd));
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if (nl[0].n_value != 0)
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{
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struct pcb *paddr;
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/* Found thread0. */
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nl[0].n_value += offsetof (struct thread, td_pcb);
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if (kvm_read (core_kd, nl[0].n_value, &paddr, sizeof paddr) == -1)
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error ("%s", kvm_geterr (core_kd));
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bsd_kvm_fetch_pcb (paddr);
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return;
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}
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#endif
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error ("Cannot find a valid PCB");
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}
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/* Kernel memory interface commands. */
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struct cmd_list_element *bsd_kvm_cmdlist;
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static void
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bsd_kvm_cmd (char *arg, int fromtty)
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{
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/* ??? Should this become an alias for "target kvm"? */
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}
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#ifndef HAVE_STRUCT_THREAD_TD_PCB
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static void
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bsd_kvm_proc_cmd (char *arg, int fromtty)
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{
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CORE_ADDR addr;
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if (arg == NULL)
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error_no_arg ("proc address");
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if (core_kd == NULL)
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error ("No kernel memory image.");
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addr = parse_and_eval_address (arg);
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#ifdef HAVE_STRUCT_LWP
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addr += offsetof (struct lwp, l_addr);
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#else
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addr += offsetof (struct proc, p_addr);
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#endif
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if (kvm_read (core_kd, addr, &bsd_kvm_paddr, sizeof bsd_kvm_paddr) == -1)
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error ("%s", kvm_geterr (core_kd));
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target_fetch_registers (-1);
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flush_cached_frames ();
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select_frame (get_current_frame ());
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print_stack_frame (get_selected_frame (NULL), -1, 1);
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}
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#endif
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static void
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bsd_kvm_pcb_cmd (char *arg, int fromtty)
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{
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if (arg == NULL)
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error_no_arg ("pcb address");
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if (core_kd == NULL)
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error ("No kernel memory image.");
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bsd_kvm_paddr = (struct pcb *)(u_long) parse_and_eval_address (arg);
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target_fetch_registers (-1);
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flush_cached_frames ();
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select_frame (get_current_frame ());
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print_stack_frame (get_selected_frame (NULL), -1, 1);
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}
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/* Add the libkvm interface to the list of all possible targets and
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register CUPPLY_PCB as the architecture-specific process control
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block interpreter. */
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void
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bsd_kvm_add_target (int (*supply_pcb)(struct regcache *, struct pcb *))
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{
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gdb_assert (bsd_kvm_supply_pcb == NULL);
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bsd_kvm_supply_pcb = supply_pcb;
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bsd_kvm_ops.to_shortname = "kvm";
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bsd_kvm_ops.to_longname = "Kernel memory interface";
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bsd_kvm_ops.to_doc = "Use a kernel virtual memory image as a target.\n\
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Optionally specify the filename of a core dump.";
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bsd_kvm_ops.to_open = bsd_kvm_open;
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bsd_kvm_ops.to_close = bsd_kvm_close;
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bsd_kvm_ops.to_fetch_registers = bsd_kvm_fetch_registers;
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bsd_kvm_ops.deprecated_xfer_memory = bsd_kvm_xfer_memory;
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bsd_kvm_ops.to_stratum = process_stratum;
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bsd_kvm_ops.to_has_memory = 1;
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bsd_kvm_ops.to_has_stack = 1;
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bsd_kvm_ops.to_has_registers = 1;
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bsd_kvm_ops.to_magic = OPS_MAGIC;
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add_target (&bsd_kvm_ops);
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add_prefix_cmd ("kvm", class_obscure, bsd_kvm_cmd, "\
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Generic command for manipulating the kernel memory interface.",
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&bsd_kvm_cmdlist, "kvm ", 0, &cmdlist);
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#ifndef HAVE_STRUCT_THREAD_TD_PCB
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add_cmd ("proc", class_obscure, bsd_kvm_proc_cmd,
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"Set current context from proc address", &bsd_kvm_cmdlist);
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#endif
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add_cmd ("pcb", class_obscure, bsd_kvm_pcb_cmd,
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"Set current context from pcb address", &bsd_kvm_cmdlist);
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}
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