1 /* BSD Kernel Data Access Library (libkvm) interface.
3 Copyright 2004 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
);
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 memaddr
, char *myaddr
, int len
,
108 int write
, struct mem_attrib
*attrib
,
109 struct target_ops
*ops
)
112 return kvm_write (core_kd
, memaddr
, myaddr
, len
);
114 return kvm_read (core_kd
, memaddr
, myaddr
, len
);
119 /* Fetch process control block at address PADDR. */
122 bsd_kvm_fetch_pcb (struct pcb
*paddr
)
126 if (kvm_read (core_kd
, (unsigned long) paddr
, &pcb
, sizeof pcb
) == -1)
127 error ("%s", kvm_geterr (core_kd
));
129 gdb_assert (bsd_kvm_supply_pcb
);
130 return bsd_kvm_supply_pcb (current_regcache
, &pcb
);
134 bsd_kvm_fetch_registers (int regnum
)
140 bsd_kvm_fetch_pcb (bsd_kvm_paddr
);
144 /* On dumping core, BSD kernels store the faulting context (PCB)
145 in the variable "dumppcb". */
146 memset (nl
, 0, sizeof nl
);
147 nl
[0].n_name
= "_dumppcb";
149 if (kvm_nlist (core_kd
, nl
) == -1)
150 error ("%s", kvm_geterr (core_kd
));
152 if (nl
[0].n_value
!= 0)
154 /* Found dumppcb. If it contains a valid context, return
156 if (bsd_kvm_fetch_pcb ((struct pcb
*) nl
[0].n_value
))
160 /* Traditional BSD kernels have a process proc0 that should always
161 be present. The address of proc0's PCB is stored in the variable
164 memset (nl
, 0, sizeof nl
);
165 nl
[0].n_name
= "_proc0paddr";
167 if (kvm_nlist (core_kd
, nl
) == -1)
168 error ("%s", kvm_geterr (core_kd
));
170 if (nl
[0].n_value
!= 0)
174 /* Found proc0paddr. */
175 if (kvm_read (core_kd
, nl
[0].n_value
, &paddr
, sizeof paddr
) == -1)
176 error ("%s", kvm_geterr (core_kd
));
178 bsd_kvm_fetch_pcb (paddr
);
182 #ifdef HAVE_STRUCT_THREAD_TD_PCB
183 /* In FreeBSD kernels for 5.0-RELEASE and later, the PCB no longer
184 lives in `struct proc' but in `struct thread'. The `struct
185 thread' for the initial thread for proc0 can be found in the
186 variable "thread0". */
188 memset (nl
, 0, sizeof nl
);
189 nl
[0].n_name
= "_thread0";
191 if (kvm_nlist (core_kd
, nl
) == -1)
192 error ("%s", kvm_geterr (core_kd
));
194 if (nl
[0].n_value
!= 0)
199 nl
[0].n_value
+= offsetof (struct thread
, td_pcb
);
200 if (kvm_read (core_kd
, nl
[0].n_value
, &paddr
, sizeof paddr
) == -1)
201 error ("%s", kvm_geterr (core_kd
));
203 bsd_kvm_fetch_pcb (paddr
);
208 error ("Cannot find a valid PCB");
212 /* Kernel memory interface commands. */
213 struct cmd_list_element
*bsd_kvm_cmdlist
;
216 bsd_kvm_cmd (char *arg
, int fromtty
)
218 /* ??? Should this become an alias for "target kvm"? */
221 #ifndef HAVE_STRUCT_THREAD_TD_PCB
224 bsd_kvm_proc_cmd (char *arg
, int fromtty
)
229 error_no_arg ("proc address");
232 error ("No kernel memory image.");
234 addr
= parse_and_eval_address (arg
);
235 #ifdef HAVE_STRUCT_LWP
236 addr
+= offsetof (struct lwp
, l_addr
);
238 addr
+= offsetof (struct proc
, p_addr
);
241 if (kvm_read (core_kd
, addr
, &bsd_kvm_paddr
, sizeof bsd_kvm_paddr
) == -1)
242 error ("%s", kvm_geterr (core_kd
));
244 target_fetch_registers (-1);
246 flush_cached_frames ();
247 select_frame (get_current_frame ());
248 print_stack_frame (get_selected_frame (NULL
), -1, 1);
254 bsd_kvm_pcb_cmd (char *arg
, int fromtty
)
257 error_no_arg ("pcb address");
260 error ("No kernel memory image.");
262 bsd_kvm_paddr
= (struct pcb
*)(u_long
) parse_and_eval_address (arg
);
264 target_fetch_registers (-1);
266 flush_cached_frames ();
267 select_frame (get_current_frame ());
268 print_stack_frame (get_selected_frame (NULL
), -1, 1);
271 /* Add the libkvm interface to the list of all possible targets and
272 register CUPPLY_PCB as the architecture-specific process control
273 block interpreter. */
276 bsd_kvm_add_target (int (*supply_pcb
)(struct regcache
*, struct pcb
*))
278 gdb_assert (bsd_kvm_supply_pcb
== NULL
);
279 bsd_kvm_supply_pcb
= supply_pcb
;
281 bsd_kvm_ops
.to_shortname
= "kvm";
282 bsd_kvm_ops
.to_longname
= "Kernel memory interface";
283 bsd_kvm_ops
.to_doc
= "Use a kernel virtual memory image as a target.\n\
284 Optionally specify the filename of a core dump.";
285 bsd_kvm_ops
.to_open
= bsd_kvm_open
;
286 bsd_kvm_ops
.to_close
= bsd_kvm_close
;
287 bsd_kvm_ops
.to_fetch_registers
= bsd_kvm_fetch_registers
;
288 bsd_kvm_ops
.deprecated_xfer_memory
= bsd_kvm_xfer_memory
;
289 bsd_kvm_ops
.to_stratum
= process_stratum
;
290 bsd_kvm_ops
.to_has_memory
= 1;
291 bsd_kvm_ops
.to_has_stack
= 1;
292 bsd_kvm_ops
.to_has_registers
= 1;
293 bsd_kvm_ops
.to_magic
= OPS_MAGIC
;
295 add_target (&bsd_kvm_ops
);
297 add_prefix_cmd ("kvm", class_obscure
, bsd_kvm_cmd
, "\
298 Generic command for manipulating the kernel memory interface.",
299 &bsd_kvm_cmdlist
, "kvm ", 0, &cmdlist
);
301 #ifndef HAVE_STRUCT_THREAD_TD_PCB
302 add_cmd ("proc", class_obscure
, bsd_kvm_proc_cmd
,
303 "Set current context from proc address", &bsd_kvm_cmdlist
);
305 add_cmd ("pcb", class_obscure
, bsd_kvm_pcb_cmd
,
306 "Set current context from pcb address", &bsd_kvm_cmdlist
);
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