| /* Generate a core file for the inferior process. |
| Copyright 2001, 2002 Free Software Foundation, Inc. |
| |
| This file is part of GDB. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program; if not, write to the Free Software |
| Foundation, Inc., 59 Temple Place - Suite 330, |
| Boston, MA 02111-1307, USA. */ |
| |
| #include "defs.h" |
| #include "cli/cli-decode.h" |
| #include "inferior.h" |
| #include "gdbcore.h" |
| #include "elf-bfd.h" |
| #include <sys/procfs.h> |
| #include "symfile.h" |
| #include "objfiles.h" |
| |
| static char *default_gcore_target (void); |
| static enum bfd_architecture default_gcore_arch (void); |
| static unsigned long default_gcore_mach (void); |
| static int gcore_memory_sections (bfd *); |
| |
| /* Function: gcore_command |
| Generate a core file from the inferior process. */ |
| |
| static void |
| gcore_command (char *args, int from_tty) |
| { |
| struct cleanup *old_chain; |
| char *corefilename, corefilename_buffer[40]; |
| asection *note_sec = NULL; |
| bfd *obfd; |
| void *note_data = NULL; |
| int note_size = 0; |
| |
| /* No use generating a corefile without a target process. */ |
| if (!(target_has_execution)) |
| noprocess (); |
| |
| if (args && *args) |
| corefilename = args; |
| else |
| { |
| /* Default corefile name is "core.PID". */ |
| sprintf (corefilename_buffer, "core.%d", PIDGET (inferior_ptid)); |
| corefilename = corefilename_buffer; |
| } |
| |
| if (info_verbose) |
| fprintf_filtered (gdb_stdout, |
| "Opening corefile '%s' for output.\n", corefilename); |
| |
| /* Open the output file. */ |
| if (!(obfd = bfd_openw (corefilename, default_gcore_target ()))) |
| { |
| error ("Failed to open '%s' for output.", corefilename); |
| } |
| |
| /* Need a cleanup that will close the file (FIXME: delete it?). */ |
| old_chain = make_cleanup_bfd_close (obfd); |
| |
| bfd_set_format (obfd, bfd_core); |
| bfd_set_arch_mach (obfd, default_gcore_arch (), default_gcore_mach ()); |
| |
| /* An external target method must build the notes section. */ |
| note_data = (char *) target_make_corefile_notes (obfd, ¬e_size); |
| |
| /* Create the note section. */ |
| if (note_data != NULL && note_size != 0) |
| { |
| if ((note_sec = bfd_make_section_anyway (obfd, "note0")) == NULL) |
| error ("Failed to create 'note' section for corefile: %s", |
| bfd_errmsg (bfd_get_error ())); |
| |
| bfd_set_section_vma (obfd, note_sec, 0); |
| bfd_set_section_flags (obfd, note_sec, |
| SEC_HAS_CONTENTS | SEC_READONLY | SEC_ALLOC); |
| bfd_set_section_alignment (obfd, note_sec, 0); |
| bfd_set_section_size (obfd, note_sec, note_size); |
| } |
| |
| /* Now create the memory/load sections. */ |
| if (gcore_memory_sections (obfd) == 0) |
| error ("gcore: failed to get corefile memory sections from target."); |
| |
| /* Write out the contents of the note section. */ |
| if (note_data != NULL && note_size != 0) |
| { |
| if (!bfd_set_section_contents (obfd, note_sec, note_data, 0, note_size)) |
| { |
| warning ("writing note section (%s)", |
| bfd_errmsg (bfd_get_error ())); |
| } |
| } |
| |
| /* Succeeded. */ |
| fprintf_filtered (gdb_stdout, |
| "Saved corefile %s\n", corefilename); |
| |
| /* Clean-ups will close the output file and free malloc memory. */ |
| do_cleanups (old_chain); |
| return; |
| } |
| |
| static unsigned long |
| default_gcore_mach (void) |
| { |
| #if 1 /* See if this even matters... */ |
| return 0; |
| #else |
| #ifdef TARGET_ARCHITECTURE |
| const struct bfd_arch_info * bfdarch = TARGET_ARCHITECTURE; |
| |
| if (bfdarch != NULL) |
| return bfdarch->mach; |
| #endif /* TARGET_ARCHITECTURE */ |
| if (exec_bfd == NULL) |
| error ("Can't find default bfd machine type (need execfile)."); |
| |
| return bfd_get_mach (exec_bfd); |
| #endif /* 1 */ |
| } |
| |
| static enum bfd_architecture |
| default_gcore_arch (void) |
| { |
| #ifdef TARGET_ARCHITECTURE |
| const struct bfd_arch_info * bfdarch = TARGET_ARCHITECTURE; |
| |
| if (bfdarch != NULL) |
| return bfdarch->arch; |
| #endif |
| if (exec_bfd == NULL) |
| error ("Can't find bfd architecture for corefile (need execfile)."); |
| |
| return bfd_get_arch (exec_bfd); |
| } |
| |
| static char * |
| default_gcore_target (void) |
| { |
| /* FIXME -- this may only work for ELF targets. */ |
| if (exec_bfd == NULL) |
| return NULL; |
| else |
| return bfd_get_target (exec_bfd); |
| } |
| |
| /* |
| * Default method for stack segment (preemptable by target). |
| */ |
| |
| static int (*override_derive_stack_segment) (bfd_vma *, bfd_vma *); |
| |
| extern void |
| preempt_derive_stack_segment (int (*override_func) (bfd_vma *, bfd_vma *)) |
| { |
| override_derive_stack_segment = override_func; |
| } |
| |
| /* Function: default_derive_stack_segment |
| Derive a reasonable stack segment by unwinding the target stack. |
| |
| Returns 0 for failure, 1 for success. */ |
| |
| static int |
| default_derive_stack_segment (bfd_vma *bottom, bfd_vma *top) |
| { |
| bfd_vma tmp_vma; |
| struct frame_info *fi, *tmp_fi; |
| |
| if (bottom == NULL || top == NULL) |
| return 0; /* Paranoia. */ |
| |
| if (!target_has_stack || !target_has_registers) |
| return 0; /* Can't succeed without stack and registers. */ |
| |
| if ((fi = get_current_frame ()) == NULL) |
| return 0; /* Can't succeed without current frame. */ |
| |
| /* Save frame pointer of TOS frame. */ |
| *top = fi->frame; |
| /* If current stack pointer is more "inner", use that instead. */ |
| if (INNER_THAN (read_sp (), *top)) |
| *top = read_sp (); |
| |
| /* Find prev-most frame. */ |
| while ((tmp_fi = get_prev_frame (fi)) != NULL) |
| fi = tmp_fi; |
| |
| /* Save frame pointer of prev-most frame. */ |
| *bottom = fi->frame; |
| |
| /* Now canonicalize their order, so that 'bottom' is a lower address |
| (as opposed to a lower stack frame). */ |
| if (*bottom > *top) |
| { |
| tmp_vma = *top; |
| *top = *bottom; |
| *bottom = tmp_vma; |
| } |
| |
| return 1; /* success */ |
| } |
| |
| static int |
| derive_stack_segment (bfd_vma *bottom, bfd_vma *top) |
| { |
| if (override_derive_stack_segment) |
| return override_derive_stack_segment (bottom, top); |
| else |
| return default_derive_stack_segment (bottom, top); |
| } |
| |
| /* |
| * Default method for heap segment (preemptable by target). |
| */ |
| |
| static int (*override_derive_heap_segment) (bfd *, bfd_vma *, bfd_vma *); |
| |
| extern void |
| preempt_derive_heap_segment (int (*override_func) (bfd *, |
| bfd_vma *, bfd_vma *)) |
| { |
| override_derive_heap_segment = override_func; |
| } |
| |
| /* Function: default_derive_heap_segment |
| Derive a reasonable heap segment by looking at sbrk and |
| the static data sections. |
| |
| Returns 0 for failure, 1 for success. */ |
| |
| static int |
| default_derive_heap_segment (bfd *abfd, bfd_vma *bottom, bfd_vma *top) |
| { |
| bfd_vma top_of_data_memory = 0; |
| bfd_vma top_of_heap = 0; |
| bfd_size_type sec_size; |
| struct value *zero, *sbrk; |
| bfd_vma sec_vaddr; |
| asection *sec; |
| |
| if (bottom == NULL || top == NULL) |
| return 0; /* Paranoia. */ |
| |
| if (!target_has_execution) |
| return 0; /* This function depends on being able |
| to call a function in the inferior. */ |
| |
| /* Assumption: link map is arranged as follows (low to high addresses): |
| text sections |
| data sections (including bss) |
| heap |
| */ |
| |
| for (sec = abfd->sections; sec; sec = sec->next) |
| { |
| if (bfd_get_section_flags (abfd, sec) & SEC_DATA || |
| strcmp (".bss", bfd_get_section_name (abfd, sec)) == 0) |
| { |
| sec_vaddr = bfd_get_section_vma (abfd, sec); |
| sec_size = bfd_get_section_size_before_reloc (sec); |
| if (sec_vaddr + sec_size > top_of_data_memory) |
| top_of_data_memory = sec_vaddr + sec_size; |
| } |
| } |
| /* Now get the top-of-heap by calling sbrk in the inferior. */ |
| if ((sbrk = find_function_in_inferior ("sbrk")) == NULL) |
| return 0; |
| if ((zero = value_from_longest (builtin_type_int, (LONGEST) 0)) == NULL) |
| return 0; |
| if ((sbrk = call_function_by_hand (sbrk, 1, &zero)) == NULL) |
| return 0; |
| top_of_heap = value_as_long (sbrk); |
| |
| /* Return results. */ |
| if (top_of_heap > top_of_data_memory) |
| { |
| *bottom = top_of_data_memory; |
| *top = top_of_heap; |
| return 1; /* success */ |
| } |
| else |
| return 0; /* No additional heap space needs to be saved. */ |
| } |
| |
| static int |
| derive_heap_segment (bfd *abfd, bfd_vma *bottom, bfd_vma *top) |
| { |
| if (override_derive_heap_segment) |
| return override_derive_heap_segment (abfd, bottom, top); |
| else |
| return default_derive_heap_segment (abfd, bottom, top); |
| } |
| |
| /* ARGSUSED */ |
| static void |
| make_output_phdrs (bfd *obfd, asection *osec, void *ignored) |
| { |
| int p_flags = 0; |
| int p_type; |
| |
| /* FIXME: these constants may only be applicable for ELF. */ |
| if (strncmp (osec->name, "load", 4) == 0) |
| p_type = PT_LOAD; |
| else |
| p_type = PT_NOTE; |
| |
| p_flags |= PF_R; /* Segment is readable. */ |
| if (!(bfd_get_section_flags (obfd, osec) & SEC_READONLY)) |
| p_flags |= PF_W; /* Segment is writable. */ |
| if (bfd_get_section_flags (obfd, osec) & SEC_CODE) |
| p_flags |= PF_X; /* Segment is executable. */ |
| |
| bfd_record_phdr (obfd, p_type, 1, p_flags, 0, 0, |
| 0, 0, 1, &osec); |
| } |
| |
| static asection * |
| make_mem_sec (bfd *obfd, |
| bfd_vma addr, |
| bfd_size_type size, |
| unsigned int flags, |
| unsigned int alignment) |
| { |
| asection *osec; |
| |
| if ((osec = bfd_make_section_anyway (obfd, "load")) == NULL) |
| { |
| warning ("Couldn't make gcore segment: %s", |
| bfd_errmsg (bfd_get_error ())); |
| return NULL; |
| } |
| |
| if (info_verbose) |
| { |
| fprintf_filtered (gdb_stdout, |
| "Save segment, %lld bytes at 0x%s\n", |
| (long long) size, paddr_nz (addr)); |
| } |
| |
| bfd_set_section_size (obfd, osec, size); |
| bfd_set_section_vma (obfd, osec, addr); |
| osec->lma = 0; /* FIXME: there should be a macro for this! */ |
| bfd_set_section_alignment (obfd, osec, alignment); |
| bfd_set_section_flags (obfd, osec, |
| flags | SEC_LOAD | SEC_ALLOC | SEC_HAS_CONTENTS); |
| return osec; |
| } |
| |
| static int |
| gcore_create_callback (CORE_ADDR vaddr, |
| unsigned long size, |
| int read, int write, int exec, |
| void *data) |
| { |
| flagword flags = 0; |
| |
| if (write == 0) |
| { |
| flags |= SEC_READONLY; |
| /* Set size == zero for readonly sections. */ |
| size = 0; |
| } |
| if (exec) |
| { |
| flags |= SEC_CODE; |
| } |
| else |
| { |
| flags |= SEC_DATA; |
| } |
| |
| return ((make_mem_sec ((bfd *) data, vaddr, size, flags, 0)) == NULL); |
| } |
| |
| static int |
| objfile_find_memory_regions (int (*func) (CORE_ADDR, |
| unsigned long, |
| int, int, int, |
| void *), |
| void *obfd) |
| { |
| /* Use objfile data to create memory sections. */ |
| struct objfile *objfile; |
| struct obj_section *objsec; |
| bfd_vma temp_bottom, temp_top; |
| |
| /* Call callback function for each objfile section. */ |
| ALL_OBJSECTIONS (objfile, objsec) |
| { |
| bfd *ibfd = objfile->obfd; |
| asection *isec = objsec->the_bfd_section; |
| flagword flags = bfd_get_section_flags (ibfd, isec); |
| int ret; |
| |
| if ((flags & SEC_ALLOC) || (flags & SEC_LOAD)) |
| { |
| int size = bfd_section_size (ibfd, isec); |
| int ret; |
| |
| if ((ret = (*func) (objsec->addr, |
| bfd_section_size (ibfd, isec), |
| 1, /* All sections will be readable. */ |
| (flags & SEC_READONLY) == 0, /* writable */ |
| (flags & SEC_CODE) != 0, /* executable */ |
| obfd)) != 0) |
| return ret; |
| } |
| } |
| |
| /* Make a stack segment. */ |
| if (derive_stack_segment (&temp_bottom, &temp_top)) |
| (*func) (temp_bottom, |
| temp_top - temp_bottom, |
| 1, /* Stack section will be readable */ |
| 1, /* Stack section will be writable */ |
| 0, /* Stack section will not be executable */ |
| obfd); |
| |
| /* Make a heap segment. */ |
| if (derive_heap_segment (exec_bfd, &temp_bottom, &temp_top)) |
| (*func) (temp_bottom, |
| temp_top - temp_bottom, |
| 1, /* Heap section will be readable */ |
| 1, /* Heap section will be writable */ |
| 0, /* Heap section will not be executable */ |
| obfd); |
| return 0; |
| } |
| |
| static void |
| gcore_copy_callback (bfd *obfd, asection *osec, void *ignored) |
| { |
| bfd_size_type size = bfd_section_size (obfd, osec); |
| struct cleanup *old_chain = NULL; |
| void *memhunk; |
| |
| if (size == 0) |
| return; /* Read-only sections are marked as zero-size. |
| We don't have to copy their contents. */ |
| if (strncmp ("load", bfd_get_section_name (obfd, osec), 4) != 0) |
| return; /* Only interested in "load" sections. */ |
| |
| if ((memhunk = xmalloc (size)) == NULL) |
| error ("Not enough memory to create corefile."); |
| old_chain = make_cleanup (xfree, memhunk); |
| |
| if (target_read_memory (bfd_section_vma (obfd, osec), |
| memhunk, size) != 0) |
| warning ("Memory read failed for corefile section, %ld bytes at 0x%s\n", |
| (long) size, paddr (bfd_section_vma (obfd, osec))); |
| if (!bfd_set_section_contents (obfd, osec, memhunk, 0, size)) |
| warning ("Failed to write corefile contents (%s).", |
| bfd_errmsg (bfd_get_error ())); |
| |
| do_cleanups (old_chain); /* frees the xmalloc buffer */ |
| } |
| |
| static int |
| gcore_memory_sections (bfd *obfd) |
| { |
| if (target_find_memory_regions (gcore_create_callback, obfd) != 0) |
| return 0; /* FIXME error return/msg? */ |
| |
| /* Record phdrs for section-to-segment mapping. */ |
| bfd_map_over_sections (obfd, make_output_phdrs, NULL); |
| |
| /* Copy memory region contents. */ |
| bfd_map_over_sections (obfd, gcore_copy_callback, NULL); |
| |
| return 1; /* success */ |
| } |
| |
| void |
| _initialize_gcore (void) |
| { |
| add_com ("generate-core-file", class_files, gcore_command, |
| "Save a core file with the current state of the debugged process.\n\ |
| Argument is optional filename. Default filename is 'core.<process_id>'."); |
| |
| add_com_alias ("gcore", "generate-core-file", class_files, 1); |
| exec_set_find_memory_regions (objfile_find_memory_regions); |
| } |