db60052eccad4efb072111a1579a6c271a2198ed
1 /* BSD Kernel Data Access Library (libkvm) interface.
3 Copyright 2004, 2005 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
23 #include "cli/cli-cmds.h"
29 #include "gdbcore.h" /* for get_exec_file */
31 #include "gdb_assert.h"
37 #include "readline/readline.h"
38 #include <sys/param.h>
44 /* Kernel memory interface descriptor. */
47 /* Address of process control block. */
48 struct pcb
*bsd_kvm_paddr
;
50 /* Pointer to architecture-specific function that reconstructs the
51 register state from PCB and supplies it to REGCACHE. */
52 int (*bsd_kvm_supply_pcb
)(struct regcache
*regcache
, struct pcb
*pcb
);
54 /* Target ops for libkvm interface. */
55 struct target_ops bsd_kvm_ops
;
58 bsd_kvm_open (char *filename
, int from_tty
)
60 char errbuf
[_POSIX2_LINE_MAX
];
61 char *execfile
= NULL
;
64 target_preopen (from_tty
);
70 filename
= tilde_expand (filename
);
71 if (filename
[0] != '/')
73 temp
= concat (current_directory
, "/", filename
, NULL
);
79 execfile
= get_exec_file (0);
80 temp_kd
= kvm_openfiles (execfile
, filename
, NULL
, O_RDONLY
, errbuf
);
82 error (("%s"), errbuf
);
84 unpush_target (&bsd_kvm_ops
);
86 push_target (&bsd_kvm_ops
);
88 target_fetch_registers (-1);
90 flush_cached_frames ();
91 select_frame (get_current_frame ());
92 print_stack_frame (get_selected_frame (NULL
), -1, 1);
96 bsd_kvm_close (int quitting
)
100 if (kvm_close (core_kd
) == -1)
101 warning (("%s"), kvm_geterr(core_kd
));
107 bsd_kvm_xfer_memory (CORE_ADDR addr
, ULONGEST len
,
108 gdb_byte
*readbuf
, const gdb_byte
*writebuf
)
110 ssize_t nbytes
= len
;
113 nbytes
= kvm_read (core_kd
, addr
, readbuf
, nbytes
);
114 if (writebuf
&& nbytes
> 0)
115 nbytes
= kvm_write (core_kd
, addr
, writebuf
, nbytes
);
120 bsd_kvm_xfer_partial (struct target_ops
*ops
, enum target_object object
,
121 const char *annex
, gdb_byte
*readbuf
,
122 const gdb_byte
*writebuf
,
123 ULONGEST offset
, LONGEST len
)
127 case TARGET_OBJECT_MEMORY
:
128 return bsd_kvm_xfer_memory (offset
, len
, readbuf
, writebuf
);
135 /* Fetch process control block at address PADDR. */
138 bsd_kvm_fetch_pcb (struct pcb
*paddr
)
142 if (kvm_read (core_kd
, (unsigned long) paddr
, &pcb
, sizeof pcb
) == -1)
143 error (("%s"), kvm_geterr (core_kd
));
145 gdb_assert (bsd_kvm_supply_pcb
);
146 return bsd_kvm_supply_pcb (current_regcache
, &pcb
);
150 bsd_kvm_fetch_registers (int regnum
)
156 bsd_kvm_fetch_pcb (bsd_kvm_paddr
);
160 /* On dumping core, BSD kernels store the faulting context (PCB)
161 in the variable "dumppcb". */
162 memset (nl
, 0, sizeof nl
);
163 nl
[0].n_name
= "_dumppcb";
165 if (kvm_nlist (core_kd
, nl
) == -1)
166 error (("%s"), kvm_geterr (core_kd
));
168 if (nl
[0].n_value
!= 0)
170 /* Found dumppcb. If it contains a valid context, return
172 if (bsd_kvm_fetch_pcb ((struct pcb
*) nl
[0].n_value
))
176 /* Traditional BSD kernels have a process proc0 that should always
177 be present. The address of proc0's PCB is stored in the variable
180 memset (nl
, 0, sizeof nl
);
181 nl
[0].n_name
= "_proc0paddr";
183 if (kvm_nlist (core_kd
, nl
) == -1)
184 error (("%s"), kvm_geterr (core_kd
));
186 if (nl
[0].n_value
!= 0)
190 /* Found proc0paddr. */
191 if (kvm_read (core_kd
, nl
[0].n_value
, &paddr
, sizeof paddr
) == -1)
192 error (("%s"), kvm_geterr (core_kd
));
194 bsd_kvm_fetch_pcb (paddr
);
198 #ifdef HAVE_STRUCT_THREAD_TD_PCB
199 /* In FreeBSD kernels for 5.0-RELEASE and later, the PCB no longer
200 lives in `struct proc' but in `struct thread'. The `struct
201 thread' for the initial thread for proc0 can be found in the
202 variable "thread0". */
204 memset (nl
, 0, sizeof nl
);
205 nl
[0].n_name
= "_thread0";
207 if (kvm_nlist (core_kd
, nl
) == -1)
208 error (("%s"), kvm_geterr (core_kd
));
210 if (nl
[0].n_value
!= 0)
215 nl
[0].n_value
+= offsetof (struct thread
, td_pcb
);
216 if (kvm_read (core_kd
, nl
[0].n_value
, &paddr
, sizeof paddr
) == -1)
217 error (("%s"), kvm_geterr (core_kd
));
219 bsd_kvm_fetch_pcb (paddr
);
224 /* i18n: PCB == "Process Control Block" */
225 error (_("Cannot find a valid PCB"));
229 /* Kernel memory interface commands. */
230 struct cmd_list_element
*bsd_kvm_cmdlist
;
233 bsd_kvm_cmd (char *arg
, int fromtty
)
235 /* ??? Should this become an alias for "target kvm"? */
238 #ifndef HAVE_STRUCT_THREAD_TD_PCB
241 bsd_kvm_proc_cmd (char *arg
, int fromtty
)
246 error_no_arg (_("proc address"));
249 error (_("No kernel memory image."));
251 addr
= parse_and_eval_address (arg
);
252 #ifdef HAVE_STRUCT_LWP
253 addr
+= offsetof (struct lwp
, l_addr
);
255 addr
+= offsetof (struct proc
, p_addr
);
258 if (kvm_read (core_kd
, addr
, &bsd_kvm_paddr
, sizeof bsd_kvm_paddr
) == -1)
259 error (("%s"), kvm_geterr (core_kd
));
261 target_fetch_registers (-1);
263 flush_cached_frames ();
264 select_frame (get_current_frame ());
265 print_stack_frame (get_selected_frame (NULL
), -1, 1);
271 bsd_kvm_pcb_cmd (char *arg
, int fromtty
)
274 /* i18n: PCB == "Process Control Block" */
275 error_no_arg (_("pcb address"));
278 error (_("No kernel memory image."));
280 bsd_kvm_paddr
= (struct pcb
*)(u_long
) parse_and_eval_address (arg
);
282 target_fetch_registers (-1);
284 flush_cached_frames ();
285 select_frame (get_current_frame ());
286 print_stack_frame (get_selected_frame (NULL
), -1, 1);
289 /* Add the libkvm interface to the list of all possible targets and
290 register CUPPLY_PCB as the architecture-specific process control
291 block interpreter. */
294 bsd_kvm_add_target (int (*supply_pcb
)(struct regcache
*, struct pcb
*))
296 gdb_assert (bsd_kvm_supply_pcb
== NULL
);
297 bsd_kvm_supply_pcb
= supply_pcb
;
299 bsd_kvm_ops
.to_shortname
= "kvm";
300 bsd_kvm_ops
.to_longname
= _("Kernel memory interface");
301 bsd_kvm_ops
.to_doc
= _("Use a kernel virtual memory image as a target.\n\
302 Optionally specify the filename of a core dump.");
303 bsd_kvm_ops
.to_open
= bsd_kvm_open
;
304 bsd_kvm_ops
.to_close
= bsd_kvm_close
;
305 bsd_kvm_ops
.to_fetch_registers
= bsd_kvm_fetch_registers
;
306 bsd_kvm_ops
.to_xfer_partial
= bsd_kvm_xfer_partial
;
307 bsd_kvm_ops
.to_stratum
= process_stratum
;
308 bsd_kvm_ops
.to_has_memory
= 1;
309 bsd_kvm_ops
.to_has_stack
= 1;
310 bsd_kvm_ops
.to_has_registers
= 1;
311 bsd_kvm_ops
.to_magic
= OPS_MAGIC
;
313 add_target (&bsd_kvm_ops
);
315 add_prefix_cmd ("kvm", class_obscure
, bsd_kvm_cmd
, _("\
316 Generic command for manipulating the kernel memory interface."),
317 &bsd_kvm_cmdlist
, "kvm ", 0, &cmdlist
);
319 #ifndef HAVE_STRUCT_THREAD_TD_PCB
320 add_cmd ("proc", class_obscure
, bsd_kvm_proc_cmd
,
321 _("Set current context from proc address"), &bsd_kvm_cmdlist
);
323 add_cmd ("pcb", class_obscure
, bsd_kvm_pcb_cmd
,
324 /* i18n: PCB == "Process Control Block" */
325 _("Set current context from pcb address"), &bsd_kvm_cmdlist
);
This page took 0.036576 seconds and 4 git commands to generate.