1 /* BSD Kernel Data Access Library (libkvm) interface.
3 Copyright (C) 2004, 2005, 2007, 2008 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 3 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, see <http://www.gnu.org/licenses/>. */
21 #include "cli/cli-cmds.h"
27 #include "gdbcore.h" /* for get_exec_file */
29 #include "gdb_assert.h"
36 #include "readline/readline.h"
37 #include <sys/param.h>
43 /* Kernel memory device file. */
44 static const char *bsd_kvm_corefile
;
46 /* Kernel memory interface descriptor. */
47 static kvm_t
*core_kd
;
49 /* Address of process control block. */
50 static struct pcb
*bsd_kvm_paddr
;
52 /* Pointer to architecture-specific function that reconstructs the
53 register state from PCB and supplies it to REGCACHE. */
54 static int (*bsd_kvm_supply_pcb
)(struct regcache
*regcache
, struct pcb
*pcb
);
56 /* Target ops for libkvm interface. */
57 static struct target_ops bsd_kvm_ops
;
60 bsd_kvm_open (char *filename
, int from_tty
)
62 char errbuf
[_POSIX2_LINE_MAX
];
63 char *execfile
= NULL
;
66 target_preopen (from_tty
);
72 filename
= tilde_expand (filename
);
73 if (filename
[0] != '/')
75 temp
= concat (current_directory
, "/", filename
, (char *)NULL
);
81 execfile
= get_exec_file (0);
82 temp_kd
= kvm_openfiles (execfile
, filename
, NULL
,
83 write_files
? O_RDWR
: O_RDONLY
, errbuf
);
85 error (("%s"), errbuf
);
87 bsd_kvm_corefile
= filename
;
88 unpush_target (&bsd_kvm_ops
);
90 push_target (&bsd_kvm_ops
);
92 target_fetch_registers (get_current_regcache (), -1);
94 reinit_frame_cache ();
95 print_stack_frame (get_selected_frame (NULL
), -1, 1);
99 bsd_kvm_close (int quitting
)
103 if (kvm_close (core_kd
) == -1)
104 warning (("%s"), kvm_geterr(core_kd
));
110 bsd_kvm_xfer_memory (CORE_ADDR addr
, ULONGEST len
,
111 gdb_byte
*readbuf
, const gdb_byte
*writebuf
)
113 ssize_t nbytes
= len
;
116 nbytes
= kvm_read (core_kd
, addr
, readbuf
, nbytes
);
117 if (writebuf
&& nbytes
> 0)
118 nbytes
= kvm_write (core_kd
, addr
, writebuf
, nbytes
);
123 bsd_kvm_xfer_partial (struct target_ops
*ops
, enum target_object object
,
124 const char *annex
, gdb_byte
*readbuf
,
125 const gdb_byte
*writebuf
,
126 ULONGEST offset
, LONGEST len
)
130 case TARGET_OBJECT_MEMORY
:
131 return bsd_kvm_xfer_memory (offset
, len
, readbuf
, writebuf
);
139 bsd_kvm_files_info (struct target_ops
*ops
)
141 if (bsd_kvm_corefile
&& strcmp (bsd_kvm_corefile
, _PATH_MEM
) != 0)
142 printf_filtered (_("\tUsing the kernel crash dump %s.\n"),
145 printf_filtered (_("\tUsing the currently running kernel.\n"));
148 /* Fetch process control block at address PADDR. */
151 bsd_kvm_fetch_pcb (struct regcache
*regcache
, struct pcb
*paddr
)
155 if (kvm_read (core_kd
, (unsigned long) paddr
, &pcb
, sizeof pcb
) == -1)
156 error (("%s"), kvm_geterr (core_kd
));
158 gdb_assert (bsd_kvm_supply_pcb
);
159 return bsd_kvm_supply_pcb (regcache
, &pcb
);
163 bsd_kvm_fetch_registers (struct regcache
*regcache
, int regnum
)
169 bsd_kvm_fetch_pcb (regcache
, bsd_kvm_paddr
);
173 /* On dumping core, BSD kernels store the faulting context (PCB)
174 in the variable "dumppcb". */
175 memset (nl
, 0, sizeof nl
);
176 nl
[0].n_name
= "_dumppcb";
178 if (kvm_nlist (core_kd
, nl
) == -1)
179 error (("%s"), kvm_geterr (core_kd
));
181 if (nl
[0].n_value
!= 0)
183 /* Found dumppcb. If it contains a valid context, return
185 if (bsd_kvm_fetch_pcb (regcache
, (struct pcb
*) nl
[0].n_value
))
189 /* Traditional BSD kernels have a process proc0 that should always
190 be present. The address of proc0's PCB is stored in the variable
193 memset (nl
, 0, sizeof nl
);
194 nl
[0].n_name
= "_proc0paddr";
196 if (kvm_nlist (core_kd
, nl
) == -1)
197 error (("%s"), kvm_geterr (core_kd
));
199 if (nl
[0].n_value
!= 0)
203 /* Found proc0paddr. */
204 if (kvm_read (core_kd
, nl
[0].n_value
, &paddr
, sizeof paddr
) == -1)
205 error (("%s"), kvm_geterr (core_kd
));
207 bsd_kvm_fetch_pcb (regcache
, paddr
);
211 #ifdef HAVE_STRUCT_THREAD_TD_PCB
212 /* In FreeBSD kernels for 5.0-RELEASE and later, the PCB no longer
213 lives in `struct proc' but in `struct thread'. The `struct
214 thread' for the initial thread for proc0 can be found in the
215 variable "thread0". */
217 memset (nl
, 0, sizeof nl
);
218 nl
[0].n_name
= "_thread0";
220 if (kvm_nlist (core_kd
, nl
) == -1)
221 error (("%s"), kvm_geterr (core_kd
));
223 if (nl
[0].n_value
!= 0)
228 nl
[0].n_value
+= offsetof (struct thread
, td_pcb
);
229 if (kvm_read (core_kd
, nl
[0].n_value
, &paddr
, sizeof paddr
) == -1)
230 error (("%s"), kvm_geterr (core_kd
));
232 bsd_kvm_fetch_pcb (regcache
, paddr
);
237 /* i18n: PCB == "Process Control Block" */
238 error (_("Cannot find a valid PCB"));
242 /* Kernel memory interface commands. */
243 struct cmd_list_element
*bsd_kvm_cmdlist
;
246 bsd_kvm_cmd (char *arg
, int fromtty
)
248 /* ??? Should this become an alias for "target kvm"? */
251 #ifndef HAVE_STRUCT_THREAD_TD_PCB
254 bsd_kvm_proc_cmd (char *arg
, int fromtty
)
259 error_no_arg (_("proc address"));
262 error (_("No kernel memory image."));
264 addr
= parse_and_eval_address (arg
);
265 #ifdef HAVE_STRUCT_LWP
266 addr
+= offsetof (struct lwp
, l_addr
);
268 addr
+= offsetof (struct proc
, p_addr
);
271 if (kvm_read (core_kd
, addr
, &bsd_kvm_paddr
, sizeof bsd_kvm_paddr
) == -1)
272 error (("%s"), kvm_geterr (core_kd
));
274 target_fetch_registers (get_current_regcache (), -1);
276 reinit_frame_cache ();
277 print_stack_frame (get_selected_frame (NULL
), -1, 1);
283 bsd_kvm_pcb_cmd (char *arg
, int fromtty
)
286 /* i18n: PCB == "Process Control Block" */
287 error_no_arg (_("pcb address"));
290 error (_("No kernel memory image."));
292 bsd_kvm_paddr
= (struct pcb
*)(u_long
) parse_and_eval_address (arg
);
294 target_fetch_registers (get_current_regcache (), -1);
296 reinit_frame_cache ();
297 print_stack_frame (get_selected_frame (NULL
), -1, 1);
300 /* Add the libkvm interface to the list of all possible targets and
301 register CUPPLY_PCB as the architecture-specific process control
302 block interpreter. */
305 bsd_kvm_add_target (int (*supply_pcb
)(struct regcache
*, struct pcb
*))
307 gdb_assert (bsd_kvm_supply_pcb
== NULL
);
308 bsd_kvm_supply_pcb
= supply_pcb
;
310 bsd_kvm_ops
.to_shortname
= "kvm";
311 bsd_kvm_ops
.to_longname
= _("Kernel memory interface");
312 bsd_kvm_ops
.to_doc
= _("Use a kernel virtual memory image as a target.\n\
313 Optionally specify the filename of a core dump.");
314 bsd_kvm_ops
.to_open
= bsd_kvm_open
;
315 bsd_kvm_ops
.to_close
= bsd_kvm_close
;
316 bsd_kvm_ops
.to_fetch_registers
= bsd_kvm_fetch_registers
;
317 bsd_kvm_ops
.to_xfer_partial
= bsd_kvm_xfer_partial
;
318 bsd_kvm_ops
.to_files_info
= bsd_kvm_files_info
;
319 bsd_kvm_ops
.to_stratum
= process_stratum
;
320 bsd_kvm_ops
.to_has_memory
= 1;
321 bsd_kvm_ops
.to_has_stack
= 1;
322 bsd_kvm_ops
.to_has_registers
= 1;
323 bsd_kvm_ops
.to_magic
= OPS_MAGIC
;
325 add_target (&bsd_kvm_ops
);
327 add_prefix_cmd ("kvm", class_obscure
, bsd_kvm_cmd
, _("\
328 Generic command for manipulating the kernel memory interface."),
329 &bsd_kvm_cmdlist
, "kvm ", 0, &cmdlist
);
331 #ifndef HAVE_STRUCT_THREAD_TD_PCB
332 add_cmd ("proc", class_obscure
, bsd_kvm_proc_cmd
,
333 _("Set current context from proc address"), &bsd_kvm_cmdlist
);
335 add_cmd ("pcb", class_obscure
, bsd_kvm_pcb_cmd
,
336 /* i18n: PCB == "Process Control Block" */
337 _("Set current context from pcb address"), &bsd_kvm_cmdlist
);
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