1 /* Generate a core file for the inferior process.
3 Copyright 2001, 2002, 2003 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-decode.h"
30 static char *default_gcore_target (void);
31 static enum bfd_architecture
default_gcore_arch (void);
32 static unsigned long default_gcore_mach (void);
33 static int gcore_memory_sections (bfd
*);
35 /* Function: gcore_command
36 Generate a core file from the inferior process. */
39 gcore_command (char *args
, int from_tty
)
41 struct cleanup
*old_chain
;
42 char *corefilename
, corefilename_buffer
[40];
43 asection
*note_sec
= NULL
;
45 void *note_data
= NULL
;
48 /* No use generating a corefile without a target process. */
49 if (!(target_has_execution
))
56 /* Default corefile name is "core.PID". */
57 sprintf (corefilename_buffer
, "core.%d", PIDGET (inferior_ptid
));
58 corefilename
= corefilename_buffer
;
62 fprintf_filtered (gdb_stdout
,
63 "Opening corefile '%s' for output.\n", corefilename
);
65 /* Open the output file. */
66 if (!(obfd
= bfd_openw (corefilename
, default_gcore_target ())))
68 error ("Failed to open '%s' for output.", corefilename
);
71 /* Need a cleanup that will close the file (FIXME: delete it?). */
72 old_chain
= make_cleanup_bfd_close (obfd
);
74 bfd_set_format (obfd
, bfd_core
);
75 bfd_set_arch_mach (obfd
, default_gcore_arch (), default_gcore_mach ());
77 /* An external target method must build the notes section. */
78 note_data
= (char *) target_make_corefile_notes (obfd
, ¬e_size
);
80 /* Create the note section. */
81 if (note_data
!= NULL
&& note_size
!= 0)
83 if ((note_sec
= bfd_make_section_anyway (obfd
, "note0")) == NULL
)
84 error ("Failed to create 'note' section for corefile: %s",
85 bfd_errmsg (bfd_get_error ()));
87 bfd_set_section_vma (obfd
, note_sec
, 0);
88 bfd_set_section_flags (obfd
, note_sec
,
89 SEC_HAS_CONTENTS
| SEC_READONLY
| SEC_ALLOC
);
90 bfd_set_section_alignment (obfd
, note_sec
, 0);
91 bfd_set_section_size (obfd
, note_sec
, note_size
);
94 /* Now create the memory/load sections. */
95 if (gcore_memory_sections (obfd
) == 0)
96 error ("gcore: failed to get corefile memory sections from target.");
98 /* Write out the contents of the note section. */
99 if (note_data
!= NULL
&& note_size
!= 0)
101 if (!bfd_set_section_contents (obfd
, note_sec
, note_data
, 0, note_size
))
103 warning ("writing note section (%s)",
104 bfd_errmsg (bfd_get_error ()));
109 fprintf_filtered (gdb_stdout
,
110 "Saved corefile %s\n", corefilename
);
112 /* Clean-ups will close the output file and free malloc memory. */
113 do_cleanups (old_chain
);
118 default_gcore_mach (void)
120 #if 1 /* See if this even matters... */
123 #ifdef TARGET_ARCHITECTURE
124 const struct bfd_arch_info
* bfdarch
= TARGET_ARCHITECTURE
;
127 return bfdarch
->mach
;
128 #endif /* TARGET_ARCHITECTURE */
129 if (exec_bfd
== NULL
)
130 error ("Can't find default bfd machine type (need execfile).");
132 return bfd_get_mach (exec_bfd
);
136 static enum bfd_architecture
137 default_gcore_arch (void)
139 #ifdef TARGET_ARCHITECTURE
140 const struct bfd_arch_info
* bfdarch
= TARGET_ARCHITECTURE
;
143 return bfdarch
->arch
;
145 if (exec_bfd
== NULL
)
146 error ("Can't find bfd architecture for corefile (need execfile).");
148 return bfd_get_arch (exec_bfd
);
152 default_gcore_target (void)
154 /* FIXME -- this may only work for ELF targets. */
155 if (exec_bfd
== NULL
)
158 return bfd_get_target (exec_bfd
);
161 /* Function: derive_stack_segment
163 Derive a reasonable stack segment by unwinding the target stack.
165 Returns 0 for failure, 1 for success. */
168 derive_stack_segment (bfd_vma
*bottom
, bfd_vma
*top
)
171 struct frame_info
*fi
, *tmp_fi
;
173 if (bottom
== NULL
|| top
== NULL
)
174 return 0; /* Paranoia. */
176 if (!target_has_stack
|| !target_has_registers
)
177 return 0; /* Can't succeed without stack and registers. */
179 if ((fi
= get_current_frame ()) == NULL
)
180 return 0; /* Can't succeed without current frame. */
182 /* Save frame pointer of TOS frame. */
183 *top
= get_frame_base (fi
);
184 /* If current stack pointer is more "inner", use that instead. */
185 if (INNER_THAN (read_sp (), *top
))
188 /* Find prev-most frame. */
189 while ((tmp_fi
= get_prev_frame (fi
)) != NULL
)
192 /* Save frame pointer of prev-most frame. */
193 *bottom
= get_frame_base (fi
);
195 /* Now canonicalize their order, so that 'bottom' is a lower address
196 (as opposed to a lower stack frame). */
204 return 1; /* success */
207 /* Function: derive_heap_segment
209 Derive a reasonable heap segment by looking at sbrk and
210 the static data sections.
212 Returns 0 for failure, 1 for success. */
215 derive_heap_segment (bfd
*abfd
, bfd_vma
*bottom
, bfd_vma
*top
)
217 bfd_vma top_of_data_memory
= 0;
218 bfd_vma top_of_heap
= 0;
219 bfd_size_type sec_size
;
220 struct value
*zero
, *sbrk
;
224 if (bottom
== NULL
|| top
== NULL
)
225 return 0; /* Paranoia. */
227 if (!target_has_execution
)
228 return 0; /* This function depends on being able
229 to call a function in the inferior. */
231 /* Assumption: link map is arranged as follows (low to high addresses):
233 data sections (including bss)
237 for (sec
= abfd
->sections
; sec
; sec
= sec
->next
)
239 if (bfd_get_section_flags (abfd
, sec
) & SEC_DATA
||
240 strcmp (".bss", bfd_section_name (abfd
, sec
)) == 0)
242 sec_vaddr
= bfd_get_section_vma (abfd
, sec
);
243 sec_size
= bfd_get_section_size_before_reloc (sec
);
244 if (sec_vaddr
+ sec_size
> top_of_data_memory
)
245 top_of_data_memory
= sec_vaddr
+ sec_size
;
248 /* Now get the top-of-heap by calling sbrk in the inferior. */
249 if (lookup_minimal_symbol ("sbrk", NULL
, NULL
) != NULL
)
251 if ((sbrk
= find_function_in_inferior ("sbrk")) == NULL
)
254 else if (lookup_minimal_symbol ("_sbrk", NULL
, NULL
) != NULL
)
256 if ((sbrk
= find_function_in_inferior ("_sbrk")) == NULL
)
262 if ((zero
= value_from_longest (builtin_type_int
, (LONGEST
) 0)) == NULL
)
264 if ((sbrk
= call_function_by_hand (sbrk
, 1, &zero
)) == NULL
)
266 top_of_heap
= value_as_long (sbrk
);
268 /* Return results. */
269 if (top_of_heap
> top_of_data_memory
)
271 *bottom
= top_of_data_memory
;
273 return 1; /* success */
276 return 0; /* No additional heap space needs to be saved. */
281 make_output_phdrs (bfd
*obfd
, asection
*osec
, void *ignored
)
286 /* FIXME: these constants may only be applicable for ELF. */
287 if (strncmp (bfd_section_name (obfd
, osec
), "load", 4) == 0)
292 p_flags
|= PF_R
; /* Segment is readable. */
293 if (!(bfd_get_section_flags (obfd
, osec
) & SEC_READONLY
))
294 p_flags
|= PF_W
; /* Segment is writable. */
295 if (bfd_get_section_flags (obfd
, osec
) & SEC_CODE
)
296 p_flags
|= PF_X
; /* Segment is executable. */
298 bfd_record_phdr (obfd
, p_type
, 1, p_flags
, 0, 0,
303 make_mem_sec (bfd
*obfd
,
307 unsigned int alignment
)
311 if ((osec
= bfd_make_section_anyway (obfd
, "load")) == NULL
)
313 warning ("Couldn't make gcore segment: %s",
314 bfd_errmsg (bfd_get_error ()));
320 fprintf_filtered (gdb_stdout
,
321 "Save segment, %lld bytes at 0x%s\n",
322 (long long) size
, paddr_nz (addr
));
325 bfd_set_section_size (obfd
, osec
, size
);
326 bfd_set_section_vma (obfd
, osec
, addr
);
327 osec
->lma
= 0; /* FIXME: there should be a macro for this! */
328 bfd_set_section_alignment (obfd
, osec
, alignment
);
329 bfd_set_section_flags (obfd
, osec
,
330 flags
| SEC_LOAD
| SEC_ALLOC
| SEC_HAS_CONTENTS
);
335 gcore_create_callback (CORE_ADDR vaddr
,
337 int read
, int write
, int exec
,
344 flags
|= SEC_READONLY
;
345 /* Set size == zero for readonly sections. */
357 return ((make_mem_sec ((bfd
*) data
, vaddr
, size
, flags
, 0)) == NULL
);
361 objfile_find_memory_regions (int (*func
) (CORE_ADDR
,
367 /* Use objfile data to create memory sections. */
368 struct objfile
*objfile
;
369 struct obj_section
*objsec
;
370 bfd_vma temp_bottom
, temp_top
;
372 /* Call callback function for each objfile section. */
373 ALL_OBJSECTIONS (objfile
, objsec
)
375 bfd
*ibfd
= objfile
->obfd
;
376 asection
*isec
= objsec
->the_bfd_section
;
377 flagword flags
= bfd_get_section_flags (ibfd
, isec
);
380 if ((flags
& SEC_ALLOC
) || (flags
& SEC_LOAD
))
382 int size
= bfd_section_size (ibfd
, isec
);
385 if ((ret
= (*func
) (objsec
->addr
,
386 bfd_section_size (ibfd
, isec
),
387 1, /* All sections will be readable. */
388 (flags
& SEC_READONLY
) == 0, /* writable */
389 (flags
& SEC_CODE
) != 0, /* executable */
395 /* Make a stack segment. */
396 if (derive_stack_segment (&temp_bottom
, &temp_top
))
397 (*func
) (temp_bottom
,
398 temp_top
- temp_bottom
,
399 1, /* Stack section will be readable */
400 1, /* Stack section will be writable */
401 0, /* Stack section will not be executable */
404 /* Make a heap segment. */
405 if (derive_heap_segment (exec_bfd
, &temp_bottom
, &temp_top
))
406 (*func
) (temp_bottom
,
407 temp_top
- temp_bottom
,
408 1, /* Heap section will be readable */
409 1, /* Heap section will be writable */
410 0, /* Heap section will not be executable */
416 gcore_copy_callback (bfd
*obfd
, asection
*osec
, void *ignored
)
418 bfd_size_type size
= bfd_section_size (obfd
, osec
);
419 struct cleanup
*old_chain
= NULL
;
423 return; /* Read-only sections are marked as zero-size.
424 We don't have to copy their contents. */
425 if (strncmp ("load", bfd_section_name (obfd
, osec
), 4) != 0)
426 return; /* Only interested in "load" sections. */
428 if ((memhunk
= xmalloc (size
)) == NULL
)
429 error ("Not enough memory to create corefile.");
430 old_chain
= make_cleanup (xfree
, memhunk
);
432 if (target_read_memory (bfd_section_vma (obfd
, osec
),
434 warning ("Memory read failed for corefile section, %ld bytes at 0x%s\n",
435 (long) size
, paddr (bfd_section_vma (obfd
, osec
)));
436 if (!bfd_set_section_contents (obfd
, osec
, memhunk
, 0, size
))
437 warning ("Failed to write corefile contents (%s).",
438 bfd_errmsg (bfd_get_error ()));
440 do_cleanups (old_chain
); /* frees the xmalloc buffer */
444 gcore_memory_sections (bfd
*obfd
)
446 if (target_find_memory_regions (gcore_create_callback
, obfd
) != 0)
447 return 0; /* FIXME error return/msg? */
449 /* Record phdrs for section-to-segment mapping. */
450 bfd_map_over_sections (obfd
, make_output_phdrs
, NULL
);
452 /* Copy memory region contents. */
453 bfd_map_over_sections (obfd
, gcore_copy_callback
, NULL
);
455 return 1; /* success */
459 _initialize_gcore (void)
461 add_com ("generate-core-file", class_files
, gcore_command
,
462 "Save a core file with the current state of the debugged process.\n\
463 Argument is optional filename. Default filename is 'core.<process_id>'.");
465 add_com_alias ("gcore", "generate-core-file", class_files
, 1);
466 exec_set_find_memory_regions (objfile_find_memory_regions
);