1 /* BSD Kernel Data Access Library (libkvm) interface.
3 Copyright (C) 2004, 2005, 2007 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 (current_regcache
, -1);
96 reinit_frame_cache ();
97 print_stack_frame (get_selected_frame (NULL
), -1, 1);
101 bsd_kvm_close (int quitting
)
105 if (kvm_close (core_kd
) == -1)
106 warning (("%s"), kvm_geterr(core_kd
));
112 bsd_kvm_xfer_memory (CORE_ADDR addr
, ULONGEST len
,
113 gdb_byte
*readbuf
, const gdb_byte
*writebuf
)
115 ssize_t nbytes
= len
;
118 nbytes
= kvm_read (core_kd
, addr
, readbuf
, nbytes
);
119 if (writebuf
&& nbytes
> 0)
120 nbytes
= kvm_write (core_kd
, addr
, writebuf
, nbytes
);
125 bsd_kvm_xfer_partial (struct target_ops
*ops
, enum target_object object
,
126 const char *annex
, gdb_byte
*readbuf
,
127 const gdb_byte
*writebuf
,
128 ULONGEST offset
, LONGEST len
)
132 case TARGET_OBJECT_MEMORY
:
133 return bsd_kvm_xfer_memory (offset
, len
, readbuf
, writebuf
);
141 bsd_kvm_files_info (struct target_ops
*ops
)
143 if (bsd_kvm_corefile
&& strcmp (bsd_kvm_corefile
, _PATH_MEM
) != 0)
144 printf_filtered (_("\tUsing the kernel crash dump %s.\n"),
147 printf_filtered (_("\tUsing the currently running kernel.\n"));
150 /* Fetch process control block at address PADDR. */
153 bsd_kvm_fetch_pcb (struct regcache
*regcache
, struct pcb
*paddr
)
157 if (kvm_read (core_kd
, (unsigned long) paddr
, &pcb
, sizeof pcb
) == -1)
158 error (("%s"), kvm_geterr (core_kd
));
160 gdb_assert (bsd_kvm_supply_pcb
);
161 return bsd_kvm_supply_pcb (regcache
, &pcb
);
165 bsd_kvm_fetch_registers (struct regcache
*regcache
, int regnum
)
171 bsd_kvm_fetch_pcb (regcache
, bsd_kvm_paddr
);
175 /* On dumping core, BSD kernels store the faulting context (PCB)
176 in the variable "dumppcb". */
177 memset (nl
, 0, sizeof nl
);
178 nl
[0].n_name
= "_dumppcb";
180 if (kvm_nlist (core_kd
, nl
) == -1)
181 error (("%s"), kvm_geterr (core_kd
));
183 if (nl
[0].n_value
!= 0)
185 /* Found dumppcb. If it contains a valid context, return
187 if (bsd_kvm_fetch_pcb (regcache
, (struct pcb
*) nl
[0].n_value
))
191 /* Traditional BSD kernels have a process proc0 that should always
192 be present. The address of proc0's PCB is stored in the variable
195 memset (nl
, 0, sizeof nl
);
196 nl
[0].n_name
= "_proc0paddr";
198 if (kvm_nlist (core_kd
, nl
) == -1)
199 error (("%s"), kvm_geterr (core_kd
));
201 if (nl
[0].n_value
!= 0)
205 /* Found proc0paddr. */
206 if (kvm_read (core_kd
, nl
[0].n_value
, &paddr
, sizeof paddr
) == -1)
207 error (("%s"), kvm_geterr (core_kd
));
209 bsd_kvm_fetch_pcb (regcache
, paddr
);
213 #ifdef HAVE_STRUCT_THREAD_TD_PCB
214 /* In FreeBSD kernels for 5.0-RELEASE and later, the PCB no longer
215 lives in `struct proc' but in `struct thread'. The `struct
216 thread' for the initial thread for proc0 can be found in the
217 variable "thread0". */
219 memset (nl
, 0, sizeof nl
);
220 nl
[0].n_name
= "_thread0";
222 if (kvm_nlist (core_kd
, nl
) == -1)
223 error (("%s"), kvm_geterr (core_kd
));
225 if (nl
[0].n_value
!= 0)
230 nl
[0].n_value
+= offsetof (struct thread
, td_pcb
);
231 if (kvm_read (core_kd
, nl
[0].n_value
, &paddr
, sizeof paddr
) == -1)
232 error (("%s"), kvm_geterr (core_kd
));
234 bsd_kvm_fetch_pcb (regcache
, paddr
);
239 /* i18n: PCB == "Process Control Block" */
240 error (_("Cannot find a valid PCB"));
244 /* Kernel memory interface commands. */
245 struct cmd_list_element
*bsd_kvm_cmdlist
;
248 bsd_kvm_cmd (char *arg
, int fromtty
)
250 /* ??? Should this become an alias for "target kvm"? */
253 #ifndef HAVE_STRUCT_THREAD_TD_PCB
256 bsd_kvm_proc_cmd (char *arg
, int fromtty
)
261 error_no_arg (_("proc address"));
264 error (_("No kernel memory image."));
266 addr
= parse_and_eval_address (arg
);
267 #ifdef HAVE_STRUCT_LWP
268 addr
+= offsetof (struct lwp
, l_addr
);
270 addr
+= offsetof (struct proc
, p_addr
);
273 if (kvm_read (core_kd
, addr
, &bsd_kvm_paddr
, sizeof bsd_kvm_paddr
) == -1)
274 error (("%s"), kvm_geterr (core_kd
));
276 target_fetch_registers (current_regcache
, -1);
278 reinit_frame_cache ();
279 print_stack_frame (get_selected_frame (NULL
), -1, 1);
285 bsd_kvm_pcb_cmd (char *arg
, int fromtty
)
288 /* i18n: PCB == "Process Control Block" */
289 error_no_arg (_("pcb address"));
292 error (_("No kernel memory image."));
294 bsd_kvm_paddr
= (struct pcb
*)(u_long
) parse_and_eval_address (arg
);
296 target_fetch_registers (current_regcache
, -1);
298 reinit_frame_cache ();
299 print_stack_frame (get_selected_frame (NULL
), -1, 1);
302 /* Add the libkvm interface to the list of all possible targets and
303 register CUPPLY_PCB as the architecture-specific process control
304 block interpreter. */
307 bsd_kvm_add_target (int (*supply_pcb
)(struct regcache
*, struct pcb
*))
309 gdb_assert (bsd_kvm_supply_pcb
== NULL
);
310 bsd_kvm_supply_pcb
= supply_pcb
;
312 bsd_kvm_ops
.to_shortname
= "kvm";
313 bsd_kvm_ops
.to_longname
= _("Kernel memory interface");
314 bsd_kvm_ops
.to_doc
= _("Use a kernel virtual memory image as a target.\n\
315 Optionally specify the filename of a core dump.");
316 bsd_kvm_ops
.to_open
= bsd_kvm_open
;
317 bsd_kvm_ops
.to_close
= bsd_kvm_close
;
318 bsd_kvm_ops
.to_fetch_registers
= bsd_kvm_fetch_registers
;
319 bsd_kvm_ops
.to_xfer_partial
= bsd_kvm_xfer_partial
;
320 bsd_kvm_ops
.to_files_info
= bsd_kvm_files_info
;
321 bsd_kvm_ops
.to_stratum
= process_stratum
;
322 bsd_kvm_ops
.to_has_memory
= 1;
323 bsd_kvm_ops
.to_has_stack
= 1;
324 bsd_kvm_ops
.to_has_registers
= 1;
325 bsd_kvm_ops
.to_magic
= OPS_MAGIC
;
327 add_target (&bsd_kvm_ops
);
329 add_prefix_cmd ("kvm", class_obscure
, bsd_kvm_cmd
, _("\
330 Generic command for manipulating the kernel memory interface."),
331 &bsd_kvm_cmdlist
, "kvm ", 0, &cmdlist
);
333 #ifndef HAVE_STRUCT_THREAD_TD_PCB
334 add_cmd ("proc", class_obscure
, bsd_kvm_proc_cmd
,
335 _("Set current context from proc address"), &bsd_kvm_cmdlist
);
337 add_cmd ("pcb", class_obscure
, bsd_kvm_pcb_cmd
,
338 /* i18n: PCB == "Process Control Block" */
339 _("Set current context from pcb address"), &bsd_kvm_cmdlist
);
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