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"
35 #include "readline/readline.h"
36 #include <sys/param.h>
42 /* Kernel memory interface descriptor. */
45 /* Address of process control block. */
46 struct pcb
*bsd_kvm_paddr
;
48 /* Pointer to architecture-specific function that reconstructs the
49 register state from PCB and supplies it to REGCACHE. */
50 int (*bsd_kvm_supply_pcb
)(struct regcache
*regcache
, struct pcb
*pcb
);
52 /* Target ops for libkvm interface. */
53 struct target_ops bsd_kvm_ops
;
56 bsd_kvm_open (char *filename
, int from_tty
)
58 char errbuf
[_POSIX2_LINE_MAX
];
59 char *execfile
= NULL
;
62 target_preopen (from_tty
);
68 filename
= tilde_expand (filename
);
69 if (filename
[0] != '/')
71 temp
= concat (current_directory
, "/", filename
, NULL
);
77 execfile
= get_exec_file (0);
78 temp_kd
= kvm_openfiles (execfile
, filename
, NULL
, O_RDONLY
, errbuf
);
82 unpush_target (&bsd_kvm_ops
);
84 push_target (&bsd_kvm_ops
);
86 target_fetch_registers (-1);
88 flush_cached_frames ();
89 select_frame (get_current_frame ());
90 print_stack_frame (get_selected_frame (), -1, 1);
94 bsd_kvm_close (int quitting
)
98 if (kvm_close (core_kd
) == -1)
99 warning ("%s", kvm_geterr(core_kd
));
105 bsd_kvm_xfer_memory (CORE_ADDR memaddr
, char *myaddr
, int len
,
106 int write
, struct mem_attrib
*attrib
,
107 struct target_ops
*ops
)
110 return kvm_write (core_kd
, memaddr
, myaddr
, len
);
112 return kvm_read (core_kd
, memaddr
, myaddr
, len
);
117 /* Fetch process control block at address PADDR. */
120 bsd_kvm_fetch_pcb (struct pcb
*paddr
)
124 if (kvm_read (core_kd
, (unsigned long) paddr
, &pcb
, sizeof pcb
) == -1)
125 error ("%s", kvm_geterr (core_kd
));
127 gdb_assert (bsd_kvm_supply_pcb
);
128 return bsd_kvm_supply_pcb (current_regcache
, &pcb
);
132 bsd_kvm_fetch_registers (int regnum
)
138 bsd_kvm_fetch_pcb (bsd_kvm_paddr
);
142 /* On dumping core, BSD kernels store the faulting context (PCB)
143 in the variable "dumppcb". */
144 memset (nl
, 0, sizeof nl
);
145 nl
[0].n_name
= "_dumppcb";
147 if (kvm_nlist (core_kd
, nl
) == -1)
148 error ("%s", kvm_geterr (core_kd
));
150 if (nl
[0].n_value
!= 0)
152 /* Found dumppcb. If it contains a valid context, return
154 if (bsd_kvm_fetch_pcb ((struct pcb
*) nl
[0].n_value
))
158 /* Traditional BSD kernels have a process proc0 that should always
159 be present. The address of proc0's PCB is stored in the variable
162 memset (nl
, 0, sizeof nl
);
163 nl
[0].n_name
= "_proc0paddr";
165 if (kvm_nlist (core_kd
, nl
) == -1)
166 error ("%s", kvm_geterr (core_kd
));
168 if (nl
[0].n_value
!= 0)
172 /* Found proc0paddr. */
173 if (kvm_read (core_kd
, nl
[0].n_value
, &paddr
, sizeof paddr
) == -1)
174 error ("%s", kvm_geterr (core_kd
));
176 bsd_kvm_fetch_pcb (paddr
);
180 #ifdef HAVE_STRUCT_THREAD_TD_PCB
181 /* In FreeBSD kernels for 5.0-RELEASE and later, the PCB no longer
182 lives in `struct proc' but in `struct thread'. The `struct
183 thread' for the initial thread for proc0 can be found in the
184 variable "thread0". */
186 memset (nl
, 0, sizeof nl
);
187 nl
[0].n_name
= "_thread0";
189 if (kvm_nlist (core_kd
, nl
) == -1)
190 error ("%s", kvm_geterr (core_kd
));
192 if (nl
[0].n_value
!= 0)
197 nl
[0].n_value
+= offsetof (struct thread
, td_pcb
);
198 if (kvm_read (core_kd
, nl
[0].n_value
, &paddr
, sizeof paddr
) == -1)
199 error ("%s", kvm_geterr (core_kd
));
201 bsd_kvm_fetch_pcb (paddr
);
206 error ("Cannot find a valid PCB");
210 /* Kernel memory interface commands. */
211 struct cmd_list_element
*bsd_kvm_cmdlist
;
214 bsd_kvm_cmd (char *arg
, int fromtty
)
216 /* ??? Should this become an alias for "target kvm"? */
219 #ifndef HAVE_STRUCT_THREAD_TD_PCB
222 bsd_kvm_proc_cmd (char *arg
, int fromtty
)
227 error_no_arg ("proc address");
230 error ("No kernel memory image.");
232 addr
= parse_and_eval_address (arg
);
233 #ifdef HAVE_STRUCT_LWP
234 addr
+= offsetof (struct lwp
, l_addr
);
236 addr
+= offsetof (struct proc
, p_addr
);
239 if (kvm_read (core_kd
, addr
, &bsd_kvm_paddr
, sizeof bsd_kvm_paddr
) == -1)
240 error ("%s", kvm_geterr (core_kd
));
242 target_fetch_registers (-1);
244 flush_cached_frames ();
245 select_frame (get_current_frame ());
246 print_stack_frame (get_selected_frame (), -1, 1);
252 bsd_kvm_pcb_cmd (char *arg
, int fromtty
)
255 error_no_arg ("pcb address");
258 error ("No kernel memory image.");
260 bsd_kvm_paddr
= (struct pcb
*) parse_and_eval_address (arg
);
262 target_fetch_registers (-1);
264 flush_cached_frames ();
265 select_frame (get_current_frame ());
266 print_stack_frame (get_selected_frame (), -1, 1);
269 /* Add the libkvm interface to the list of all possible targets and
270 register CUPPLY_PCB as the architecture-specific process control
271 block interpreter. */
274 bsd_kvm_add_target (int (*supply_pcb
)(struct regcache
*, struct pcb
*))
276 gdb_assert (bsd_kvm_supply_pcb
== NULL
);
277 bsd_kvm_supply_pcb
= supply_pcb
;
279 bsd_kvm_ops
.to_shortname
= "kvm";
280 bsd_kvm_ops
.to_longname
= "Kernel memory interface";
281 bsd_kvm_ops
.to_doc
= "Use a kernel virtual memory image as a target.\n\
282 Optionally specify the filename of a core dump.";
283 bsd_kvm_ops
.to_open
= bsd_kvm_open
;
284 bsd_kvm_ops
.to_close
= bsd_kvm_close
;
285 bsd_kvm_ops
.to_fetch_registers
= bsd_kvm_fetch_registers
;
286 bsd_kvm_ops
.to_xfer_memory
= bsd_kvm_xfer_memory
;
287 bsd_kvm_ops
.to_stratum
= process_stratum
;
288 bsd_kvm_ops
.to_has_memory
= 1;
289 bsd_kvm_ops
.to_has_stack
= 1;
290 bsd_kvm_ops
.to_has_registers
= 1;
291 bsd_kvm_ops
.to_magic
= OPS_MAGIC
;
293 add_target (&bsd_kvm_ops
);
295 add_prefix_cmd ("kvm", class_obscure
, bsd_kvm_cmd
, "\
296 Generic command for manipulating the kernel memory interface.",
297 &bsd_kvm_cmdlist
, "kvm ", 0, &cmdlist
);
299 #ifndef HAVE_STRUCT_THREAD_TD_PCB
300 add_cmd ("proc", class_obscure
, bsd_kvm_proc_cmd
,
301 "Set current context from proc address", &bsd_kvm_cmdlist
);
303 add_cmd ("pcb", class_obscure
, bsd_kvm_pcb_cmd
,
304 "Set current context from pcb address", &bsd_kvm_cmdlist
);
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