1 /* BSD Kernel Data Access Library (libkvm) interface.
3 Copyright (C) 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., 51 Franklin Street, Fifth Floor,
20 Boston, MA 02110-1301, USA. */
23 #include "cli/cli-cmds.h"
29 #include "gdbcore.h" /* for get_exec_file */
31 #include "gdb_assert.h"
38 #include "readline/readline.h"
39 #include <sys/param.h>
45 /* Kernel memory device file. */
46 static const char *bsd_kvm_corefile
;
48 /* Kernel memory interface descriptor. */
49 static kvm_t
*core_kd
;
51 /* Address of process control block. */
52 static struct pcb
*bsd_kvm_paddr
;
54 /* Pointer to architecture-specific function that reconstructs the
55 register state from PCB and supplies it to REGCACHE. */
56 static int (*bsd_kvm_supply_pcb
)(struct regcache
*regcache
, struct pcb
*pcb
);
58 /* Target ops for libkvm interface. */
59 static struct target_ops bsd_kvm_ops
;
62 bsd_kvm_open (char *filename
, int from_tty
)
64 char errbuf
[_POSIX2_LINE_MAX
];
65 char *execfile
= NULL
;
68 target_preopen (from_tty
);
74 filename
= tilde_expand (filename
);
75 if (filename
[0] != '/')
77 temp
= concat (current_directory
, "/", filename
, (char *)NULL
);
83 execfile
= get_exec_file (0);
84 temp_kd
= kvm_openfiles (execfile
, filename
, NULL
,
85 write_files
? O_RDWR
: O_RDONLY
, errbuf
);
87 error (("%s"), errbuf
);
89 bsd_kvm_corefile
= filename
;
90 unpush_target (&bsd_kvm_ops
);
92 push_target (&bsd_kvm_ops
);
94 target_fetch_registers (-1);
96 flush_cached_frames ();
97 select_frame (get_current_frame ());
98 print_stack_frame (get_selected_frame (NULL
), -1, 1);
102 bsd_kvm_close (int quitting
)
106 if (kvm_close (core_kd
) == -1)
107 warning (("%s"), kvm_geterr(core_kd
));
113 bsd_kvm_xfer_memory (CORE_ADDR addr
, ULONGEST len
,
114 gdb_byte
*readbuf
, const gdb_byte
*writebuf
)
116 ssize_t nbytes
= len
;
119 nbytes
= kvm_read (core_kd
, addr
, readbuf
, nbytes
);
120 if (writebuf
&& nbytes
> 0)
121 nbytes
= kvm_write (core_kd
, addr
, writebuf
, nbytes
);
126 bsd_kvm_xfer_partial (struct target_ops
*ops
, enum target_object object
,
127 const char *annex
, gdb_byte
*readbuf
,
128 const gdb_byte
*writebuf
,
129 ULONGEST offset
, LONGEST len
)
133 case TARGET_OBJECT_MEMORY
:
134 return bsd_kvm_xfer_memory (offset
, len
, readbuf
, writebuf
);
142 bsd_kvm_files_info (struct target_ops
*ops
)
144 if (bsd_kvm_corefile
&& strcmp (bsd_kvm_corefile
, _PATH_MEM
) != 0)
145 printf_filtered (_("\tUsing the kernel crash dump %s.\n"),
148 printf_filtered (_("\tUsing the currently running kernel.\n"));
151 /* Fetch process control block at address PADDR. */
154 bsd_kvm_fetch_pcb (struct pcb
*paddr
)
158 if (kvm_read (core_kd
, (unsigned long) paddr
, &pcb
, sizeof pcb
) == -1)
159 error (("%s"), kvm_geterr (core_kd
));
161 gdb_assert (bsd_kvm_supply_pcb
);
162 return bsd_kvm_supply_pcb (current_regcache
, &pcb
);
166 bsd_kvm_fetch_registers (int regnum
)
172 bsd_kvm_fetch_pcb (bsd_kvm_paddr
);
176 /* On dumping core, BSD kernels store the faulting context (PCB)
177 in the variable "dumppcb". */
178 memset (nl
, 0, sizeof nl
);
179 nl
[0].n_name
= "_dumppcb";
181 if (kvm_nlist (core_kd
, nl
) == -1)
182 error (("%s"), kvm_geterr (core_kd
));
184 if (nl
[0].n_value
!= 0)
186 /* Found dumppcb. If it contains a valid context, return
188 if (bsd_kvm_fetch_pcb ((struct pcb
*) nl
[0].n_value
))
192 /* Traditional BSD kernels have a process proc0 that should always
193 be present. The address of proc0's PCB is stored in the variable
196 memset (nl
, 0, sizeof nl
);
197 nl
[0].n_name
= "_proc0paddr";
199 if (kvm_nlist (core_kd
, nl
) == -1)
200 error (("%s"), kvm_geterr (core_kd
));
202 if (nl
[0].n_value
!= 0)
206 /* Found proc0paddr. */
207 if (kvm_read (core_kd
, nl
[0].n_value
, &paddr
, sizeof paddr
) == -1)
208 error (("%s"), kvm_geterr (core_kd
));
210 bsd_kvm_fetch_pcb (paddr
);
214 #ifdef HAVE_STRUCT_THREAD_TD_PCB
215 /* In FreeBSD kernels for 5.0-RELEASE and later, the PCB no longer
216 lives in `struct proc' but in `struct thread'. The `struct
217 thread' for the initial thread for proc0 can be found in the
218 variable "thread0". */
220 memset (nl
, 0, sizeof nl
);
221 nl
[0].n_name
= "_thread0";
223 if (kvm_nlist (core_kd
, nl
) == -1)
224 error (("%s"), kvm_geterr (core_kd
));
226 if (nl
[0].n_value
!= 0)
231 nl
[0].n_value
+= offsetof (struct thread
, td_pcb
);
232 if (kvm_read (core_kd
, nl
[0].n_value
, &paddr
, sizeof paddr
) == -1)
233 error (("%s"), kvm_geterr (core_kd
));
235 bsd_kvm_fetch_pcb (paddr
);
240 /* i18n: PCB == "Process Control Block" */
241 error (_("Cannot find a valid PCB"));
245 /* Kernel memory interface commands. */
246 struct cmd_list_element
*bsd_kvm_cmdlist
;
249 bsd_kvm_cmd (char *arg
, int fromtty
)
251 /* ??? Should this become an alias for "target kvm"? */
254 #ifndef HAVE_STRUCT_THREAD_TD_PCB
257 bsd_kvm_proc_cmd (char *arg
, int fromtty
)
262 error_no_arg (_("proc address"));
265 error (_("No kernel memory image."));
267 addr
= parse_and_eval_address (arg
);
268 #ifdef HAVE_STRUCT_LWP
269 addr
+= offsetof (struct lwp
, l_addr
);
271 addr
+= offsetof (struct proc
, p_addr
);
274 if (kvm_read (core_kd
, addr
, &bsd_kvm_paddr
, sizeof bsd_kvm_paddr
) == -1)
275 error (("%s"), kvm_geterr (core_kd
));
277 target_fetch_registers (-1);
279 flush_cached_frames ();
280 select_frame (get_current_frame ());
281 print_stack_frame (get_selected_frame (NULL
), -1, 1);
287 bsd_kvm_pcb_cmd (char *arg
, int fromtty
)
290 /* i18n: PCB == "Process Control Block" */
291 error_no_arg (_("pcb address"));
294 error (_("No kernel memory image."));
296 bsd_kvm_paddr
= (struct pcb
*)(u_long
) parse_and_eval_address (arg
);
298 target_fetch_registers (-1);
300 flush_cached_frames ();
301 select_frame (get_current_frame ());
302 print_stack_frame (get_selected_frame (NULL
), -1, 1);
305 /* Add the libkvm interface to the list of all possible targets and
306 register CUPPLY_PCB as the architecture-specific process control
307 block interpreter. */
310 bsd_kvm_add_target (int (*supply_pcb
)(struct regcache
*, struct pcb
*))
312 gdb_assert (bsd_kvm_supply_pcb
== NULL
);
313 bsd_kvm_supply_pcb
= supply_pcb
;
315 bsd_kvm_ops
.to_shortname
= "kvm";
316 bsd_kvm_ops
.to_longname
= _("Kernel memory interface");
317 bsd_kvm_ops
.to_doc
= _("Use a kernel virtual memory image as a target.\n\
318 Optionally specify the filename of a core dump.");
319 bsd_kvm_ops
.to_open
= bsd_kvm_open
;
320 bsd_kvm_ops
.to_close
= bsd_kvm_close
;
321 bsd_kvm_ops
.to_fetch_registers
= bsd_kvm_fetch_registers
;
322 bsd_kvm_ops
.to_xfer_partial
= bsd_kvm_xfer_partial
;
323 bsd_kvm_ops
.to_files_info
= bsd_kvm_files_info
;
324 bsd_kvm_ops
.to_stratum
= process_stratum
;
325 bsd_kvm_ops
.to_has_memory
= 1;
326 bsd_kvm_ops
.to_has_stack
= 1;
327 bsd_kvm_ops
.to_has_registers
= 1;
328 bsd_kvm_ops
.to_magic
= OPS_MAGIC
;
330 add_target (&bsd_kvm_ops
);
332 add_prefix_cmd ("kvm", class_obscure
, bsd_kvm_cmd
, _("\
333 Generic command for manipulating the kernel memory interface."),
334 &bsd_kvm_cmdlist
, "kvm ", 0, &cmdlist
);
336 #ifndef HAVE_STRUCT_THREAD_TD_PCB
337 add_cmd ("proc", class_obscure
, bsd_kvm_proc_cmd
,
338 _("Set current context from proc address"), &bsd_kvm_cmdlist
);
340 add_cmd ("pcb", class_obscure
, bsd_kvm_pcb_cmd
,
341 /* i18n: PCB == "Process Control Block" */
342 _("Set current context from pcb address"), &bsd_kvm_cmdlist
);
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