79ab09505f60be6fbf34fc67397132d7e183677d
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"
30 #include "gdb_assert.h"
34 #include "readline/readline.h"
35 #include <sys/param.h>
41 /* Kernel memory interface descriptor. */
44 /* Address of process control block. */
45 struct pcb
*bsd_kvm_paddr
;
47 /* Pointer to architecture-specific function that reconstructs the
48 register state from PCB and supplies it to REGCACHE. */
49 int (*bsd_kvm_supply_pcb
)(struct regcache
*regcache
, struct pcb
*pcb
);
51 /* Target ops for libkvm interface. */
52 struct target_ops bsd_kvm_ops
;
55 bsd_kvm_open (char *filename
, int from_tty
)
57 char errbuf
[_POSIX2_LINE_MAX
];
58 char *execfile
= NULL
;
61 target_preopen (from_tty
);
67 filename
= tilde_expand (filename
);
68 if (filename
[0] != '/')
70 temp
= concat (current_directory
, "/", filename
, NULL
);
76 temp_kd
= kvm_openfiles (execfile
, filename
, NULL
, O_RDONLY
, errbuf
);
80 unpush_target (&bsd_kvm_ops
);
82 push_target (&bsd_kvm_ops
);
84 target_fetch_registers (-1);
86 flush_cached_frames ();
87 select_frame (get_current_frame ());
88 print_stack_frame (get_selected_frame (), -1, 1);
92 bsd_kvm_close (int quitting
)
96 if (kvm_close (core_kd
) == -1)
97 warning ("%s", kvm_geterr(core_kd
));
103 bsd_kvm_xfer_memory (CORE_ADDR memaddr
, char *myaddr
, int len
,
104 int write
, struct mem_attrib
*attrib
,
105 struct target_ops
*ops
)
108 return kvm_write (core_kd
, memaddr
, myaddr
, len
);
110 return kvm_read (core_kd
, memaddr
, myaddr
, len
);
115 /* Fetch process control block at address PADDR. */
118 bsd_kvm_fetch_pcb (struct pcb
*paddr
)
122 if (kvm_read (core_kd
, (unsigned long) paddr
, &pcb
, sizeof pcb
) == -1)
123 error ("%s", kvm_geterr (core_kd
));
125 gdb_assert (bsd_kvm_supply_pcb
);
126 return bsd_kvm_supply_pcb (current_regcache
, &pcb
);
130 bsd_kvm_fetch_registers (int regnum
)
136 bsd_kvm_fetch_pcb (bsd_kvm_paddr
);
140 /* On dumping core, BSD kernels store the faulting context (PCB)
141 in the variable "dumppcb". */
142 memset (nl
, 0, sizeof nl
);
143 nl
[0].n_name
= "_dumppcb";
145 if (kvm_nlist (core_kd
, nl
) == -1)
146 error ("%s", kvm_geterr (core_kd
));
148 if (nl
[0].n_value
!= 0)
150 /* Found dumppcb. If it contains a valid context, return
152 if (bsd_kvm_fetch_pcb ((struct pcb
*) nl
[0].n_value
))
156 /* Traditional BSD kernels have a process proc0 that should always
157 be present. The address of proc0's PCB is stored in the variable
160 memset (nl
, 0, sizeof nl
);
161 nl
[0].n_name
= "_proc0paddr";
163 if (kvm_nlist (core_kd
, nl
) == -1)
164 error ("%s", kvm_geterr (core_kd
));
166 if (nl
[0].n_value
!= 0)
170 /* Found proc0paddr. */
171 if (kvm_read (core_kd
, nl
[0].n_value
, &paddr
, sizeof paddr
) == -1)
172 error ("%s", kvm_geterr (core_kd
));
174 bsd_kvm_fetch_pcb (paddr
);
178 #ifdef HAVE_STRUCT_THREAD_TD_PCB
179 /* In FreeBSD kernels for 5.0-RELEASE and later, the PCB no longer
180 lives in `struct proc' but in `struct thread'. The `struct
181 thread' for the initial thread for proc0 can be found in the
182 variable "thread0". */
184 memset (nl
, 0, sizeof nl
);
185 nl
[0].n_name
= "_thread0";
187 if (kvm_nlist (core_kd
, nl
) == -1)
188 error ("%s", kvm_geterr (core_kd
));
190 if (nl
[0].n_value
!= 0)
195 nl
[0].n_value
+= offsetof (struct thread
, td_pcb
);
196 if (kvm_read (core_kd
, nl
[0].n_value
, &paddr
, sizeof paddr
) == -1)
197 error ("%s", kvm_geterr (core_kd
));
199 bsd_kvm_fetch_pcb (paddr
);
204 error ("Cannot find a valid PCB");
208 /* Kernel memory interface commands. */
209 struct cmd_list_element
*bsd_kvm_cmdlist
;
212 bsd_kvm_cmd (char *arg
, int fromtty
)
214 /* ??? Should this become an alias for "target kvm"? */
217 #ifndef HAVE_STRUCT_THREAD_TD_PCB
220 bsd_kvm_proc_cmd (char *arg
, int fromtty
)
225 error_no_arg ("proc address");
228 error ("No kernel memory image.");
230 addr
= parse_and_eval_address (arg
);
231 addr
+= offsetof (struct proc
, p_addr
);
233 if (kvm_read (core_kd
, addr
, &bsd_kvm_paddr
, sizeof bsd_kvm_paddr
) == -1)
234 error ("%s", kvm_geterr (core_kd
));
236 target_fetch_registers (-1);
238 flush_cached_frames ();
239 select_frame (get_current_frame ());
240 print_stack_frame (get_selected_frame (), -1, 1);
246 bsd_kvm_pcb_cmd (char *arg
, int fromtty
)
249 error_no_arg ("pcb address");
252 error ("No kernel memory image.");
254 bsd_kvm_paddr
= (struct pcb
*) parse_and_eval_address (arg
);
256 target_fetch_registers (-1);
258 flush_cached_frames ();
259 select_frame (get_current_frame ());
260 print_stack_frame (get_selected_frame (), -1, 1);
263 /* Add the libkvm interface to the list of all possible targets and
264 register CUPPLY_PCB as the architecture-specific process control
265 block interpreter. */
268 bsd_kvm_add_target (int (*supply_pcb
)(struct regcache
*, struct pcb
*))
270 gdb_assert (bsd_kvm_supply_pcb
== NULL
);
271 bsd_kvm_supply_pcb
= supply_pcb
;
273 bsd_kvm_ops
.to_shortname
= "kvm";
274 bsd_kvm_ops
.to_longname
= "Kernel memory interface";
275 bsd_kvm_ops
.to_doc
= "Use a kernel virtual memory image as a target.\n\
276 Optionally specify the filename of a core dump.";
277 bsd_kvm_ops
.to_open
= bsd_kvm_open
;
278 bsd_kvm_ops
.to_close
= bsd_kvm_close
;
279 bsd_kvm_ops
.to_fetch_registers
= bsd_kvm_fetch_registers
;
280 bsd_kvm_ops
.to_xfer_memory
= bsd_kvm_xfer_memory
;
281 bsd_kvm_ops
.to_stratum
= process_stratum
;
282 bsd_kvm_ops
.to_has_memory
= 1;
283 bsd_kvm_ops
.to_has_stack
= 1;
284 bsd_kvm_ops
.to_has_registers
= 1;
285 bsd_kvm_ops
.to_magic
= OPS_MAGIC
;
287 add_target (&bsd_kvm_ops
);
289 add_prefix_cmd ("kvm", class_obscure
, bsd_kvm_cmd
, "\
290 Generic command for manipulating the kernel memory interface.",
291 &bsd_kvm_cmdlist
, "kvm ", 0, &cmdlist
);
293 #ifndef HAVE_STRUCT_THREAD_TD_PCB
294 add_cmd ("proc", class_obscure
, bsd_kvm_proc_cmd
,
295 "Set current context from proc address", &bsd_kvm_cmdlist
);
297 add_cmd ("pcb", class_obscure
, bsd_kvm_pcb_cmd
,
298 "Set current context from pcb address", &bsd_kvm_cmdlist
);
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