| /* Generic symbol file reading for the GNU debugger, GDB. |
| |
| Copyright (C) 1990-2024 Free Software Foundation, Inc. |
| |
| Contributed by Cygnus Support, using pieces from other GDB modules. |
| |
| 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 3 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, see <http://www.gnu.org/licenses/>. */ |
| |
| #include "arch-utils.h" |
| #include "cli/cli-cmds.h" |
| #include "extract-store-integer.h" |
| #include "symtab.h" |
| #include "gdbcore.h" |
| #include "frame.h" |
| #include "target.h" |
| #include "value.h" |
| #include "symfile.h" |
| #include "objfiles.h" |
| #include "source.h" |
| #include "breakpoint.h" |
| #include "language.h" |
| #include "complaints.h" |
| #include "inferior.h" |
| #include "regcache.h" |
| #include "filenames.h" |
| #include "gdbsupport/gdb_obstack.h" |
| #include "completer.h" |
| #include "readline/tilde.h" |
| #include "block.h" |
| #include "observable.h" |
| #include "exec.h" |
| #include "varobj.h" |
| #include "solib.h" |
| #include "stack.h" |
| #include "gdb_bfd.h" |
| #include "cli/cli-utils.h" |
| #include "gdbsupport/byte-vector.h" |
| #include "gdbsupport/pathstuff.h" |
| #include "gdbsupport/selftest.h" |
| #include "cli/cli-style.h" |
| #include "gdbsupport/forward-scope-exit.h" |
| #include "gdbsupport/buildargv.h" |
| |
| #include <sys/types.h> |
| #include <fcntl.h> |
| #include <sys/stat.h> |
| #include <ctype.h> |
| #include <chrono> |
| #include <algorithm> |
| |
| int (*deprecated_ui_load_progress_hook) (const char *section, |
| unsigned long num); |
| void (*deprecated_show_load_progress) (const char *section, |
| unsigned long section_sent, |
| unsigned long section_size, |
| unsigned long total_sent, |
| unsigned long total_size); |
| void (*deprecated_pre_add_symbol_hook) (const char *); |
| void (*deprecated_post_add_symbol_hook) (void); |
| |
| using clear_symtab_users_cleanup |
| = FORWARD_SCOPE_EXIT (clear_symtab_users); |
| |
| /* Global variables owned by this file. */ |
| |
| /* See symfile.h. */ |
| |
| int readnow_symbol_files; |
| |
| /* See symfile.h. */ |
| |
| int readnever_symbol_files; |
| |
| /* Functions this file defines. */ |
| |
| static void symbol_file_add_main_1 (const char *args, symfile_add_flags add_flags, |
| objfile_flags flags, CORE_ADDR reloff); |
| |
| static const struct sym_fns *find_sym_fns (bfd *); |
| |
| static void simple_free_overlay_table (void); |
| |
| static void read_target_long_array (CORE_ADDR, unsigned int *, int, int, |
| enum bfd_endian); |
| |
| static int simple_read_overlay_table (void); |
| |
| static int simple_overlay_update_1 (struct obj_section *); |
| |
| static void symfile_find_segment_sections (struct objfile *objfile); |
| |
| /* List of all available sym_fns. On gdb startup, each object file reader |
| calls add_symtab_fns() to register information on each format it is |
| prepared to read. */ |
| |
| struct registered_sym_fns |
| { |
| registered_sym_fns (bfd_flavour sym_flavour_, const struct sym_fns *sym_fns_) |
| : sym_flavour (sym_flavour_), sym_fns (sym_fns_) |
| {} |
| |
| /* BFD flavour that we handle. */ |
| enum bfd_flavour sym_flavour; |
| |
| /* The "vtable" of symbol functions. */ |
| const struct sym_fns *sym_fns; |
| }; |
| |
| static std::vector<registered_sym_fns> symtab_fns; |
| |
| /* Values for "set print symbol-loading". */ |
| |
| const char print_symbol_loading_off[] = "off"; |
| const char print_symbol_loading_brief[] = "brief"; |
| const char print_symbol_loading_full[] = "full"; |
| static const char *print_symbol_loading_enums[] = |
| { |
| print_symbol_loading_off, |
| print_symbol_loading_brief, |
| print_symbol_loading_full, |
| NULL |
| }; |
| static const char *print_symbol_loading = print_symbol_loading_full; |
| |
| /* See symfile.h. */ |
| |
| bool auto_solib_add = true; |
| |
| |
| /* Return non-zero if symbol-loading messages should be printed. |
| FROM_TTY is the standard from_tty argument to gdb commands. |
| If EXEC is non-zero the messages are for the executable. |
| Otherwise, messages are for shared libraries. |
| If FULL is non-zero then the caller is printing a detailed message. |
| E.g., the message includes the shared library name. |
| Otherwise, the caller is printing a brief "summary" message. */ |
| |
| int |
| print_symbol_loading_p (int from_tty, int exec, int full) |
| { |
| if (!from_tty && !info_verbose) |
| return 0; |
| |
| if (exec) |
| { |
| /* We don't check FULL for executables, there are few such |
| messages, therefore brief == full. */ |
| return print_symbol_loading != print_symbol_loading_off; |
| } |
| if (full) |
| return print_symbol_loading == print_symbol_loading_full; |
| return print_symbol_loading == print_symbol_loading_brief; |
| } |
| |
| /* True if we are reading a symbol table. */ |
| |
| int currently_reading_symtab = 0; |
| |
| /* Increment currently_reading_symtab and return a cleanup that can be |
| used to decrement it. */ |
| |
| scoped_restore_tmpl<int> |
| increment_reading_symtab (void) |
| { |
| gdb_assert (currently_reading_symtab >= 0); |
| return make_scoped_restore (¤tly_reading_symtab, |
| currently_reading_symtab + 1); |
| } |
| |
| /* Remember the lowest-addressed loadable section we've seen. |
| |
| In case of equal vmas, the section with the largest size becomes the |
| lowest-addressed loadable section. |
| |
| If the vmas and sizes are equal, the last section is considered the |
| lowest-addressed loadable section. */ |
| |
| static void |
| find_lowest_section (asection *sect, asection **lowest) |
| { |
| if (0 == (bfd_section_flags (sect) & (SEC_ALLOC | SEC_LOAD))) |
| return; |
| if (!*lowest) |
| *lowest = sect; /* First loadable section */ |
| else if (bfd_section_vma (*lowest) > bfd_section_vma (sect)) |
| *lowest = sect; /* A lower loadable section */ |
| else if (bfd_section_vma (*lowest) == bfd_section_vma (sect) |
| && (bfd_section_size (*lowest) <= bfd_section_size (sect))) |
| *lowest = sect; |
| } |
| |
| /* Build (allocate and populate) a section_addr_info struct from |
| an existing section table. */ |
| |
| section_addr_info |
| build_section_addr_info_from_section_table (const std::vector<target_section> &table) |
| { |
| section_addr_info sap; |
| |
| for (const target_section &stp : table) |
| { |
| struct bfd_section *asect = stp.the_bfd_section; |
| bfd *abfd = asect->owner; |
| |
| if (bfd_section_flags (asect) & (SEC_ALLOC | SEC_LOAD) |
| && sap.size () < table.size ()) |
| sap.emplace_back (stp.addr, |
| bfd_section_name (asect), |
| gdb_bfd_section_index (abfd, asect)); |
| } |
| |
| return sap; |
| } |
| |
| /* Create a section_addr_info from section offsets in ABFD. */ |
| |
| static section_addr_info |
| build_section_addr_info_from_bfd (bfd *abfd) |
| { |
| struct bfd_section *sec; |
| |
| section_addr_info sap; |
| for (sec = abfd->sections; sec != NULL; sec = sec->next) |
| if (bfd_section_flags (sec) & (SEC_ALLOC | SEC_LOAD)) |
| sap.emplace_back (bfd_section_vma (sec), |
| bfd_section_name (sec), |
| gdb_bfd_section_index (abfd, sec)); |
| |
| return sap; |
| } |
| |
| /* Create a section_addr_info from section offsets in OBJFILE. */ |
| |
| section_addr_info |
| build_section_addr_info_from_objfile (const struct objfile *objfile) |
| { |
| int i; |
| |
| /* Before reread_symbols gets rewritten it is not safe to call: |
| gdb_assert (objfile->num_sections == bfd_count_sections (objfile->obfd)); |
| */ |
| section_addr_info sap |
| = build_section_addr_info_from_bfd (objfile->obfd.get ()); |
| for (i = 0; i < sap.size (); i++) |
| { |
| int sectindex = sap[i].sectindex; |
| |
| sap[i].addr += objfile->section_offsets[sectindex]; |
| } |
| return sap; |
| } |
| |
| /* Initialize OBJFILE's sect_index_* members. */ |
| |
| static void |
| init_objfile_sect_indices (struct objfile *objfile) |
| { |
| asection *sect; |
| int i; |
| |
| sect = bfd_get_section_by_name (objfile->obfd.get (), ".text"); |
| if (sect) |
| objfile->sect_index_text = sect->index; |
| |
| sect = bfd_get_section_by_name (objfile->obfd.get (), ".data"); |
| if (sect) |
| objfile->sect_index_data = sect->index; |
| |
| sect = bfd_get_section_by_name (objfile->obfd.get (), ".bss"); |
| if (sect) |
| objfile->sect_index_bss = sect->index; |
| |
| sect = bfd_get_section_by_name (objfile->obfd.get (), ".rodata"); |
| if (sect) |
| objfile->sect_index_rodata = sect->index; |
| |
| /* This is where things get really weird... We MUST have valid |
| indices for the various sect_index_* members or gdb will abort. |
| So if for example, there is no ".text" section, we have to |
| accommodate that. First, check for a file with the standard |
| one or two segments. */ |
| |
| symfile_find_segment_sections (objfile); |
| |
| /* Except when explicitly adding symbol files at some address, |
| section_offsets contains nothing but zeros, so it doesn't matter |
| which slot in section_offsets the individual sect_index_* members |
| index into. So if they are all zero, it is safe to just point |
| all the currently uninitialized indices to the first slot. But |
| beware: if this is the main executable, it may be relocated |
| later, e.g. by the remote qOffsets packet, and then this will |
| be wrong! That's why we try segments first. */ |
| |
| for (i = 0; i < objfile->section_offsets.size (); i++) |
| { |
| if (objfile->section_offsets[i] != 0) |
| { |
| break; |
| } |
| } |
| if (i == objfile->section_offsets.size ()) |
| { |
| if (objfile->sect_index_text == -1) |
| objfile->sect_index_text = 0; |
| if (objfile->sect_index_data == -1) |
| objfile->sect_index_data = 0; |
| if (objfile->sect_index_bss == -1) |
| objfile->sect_index_bss = 0; |
| if (objfile->sect_index_rodata == -1) |
| objfile->sect_index_rodata = 0; |
| } |
| } |
| |
| /* Find a unique offset to use for loadable section SECT if |
| the user did not provide an offset. */ |
| |
| static void |
| place_section (bfd *abfd, asection *sect, section_offsets &offsets, |
| CORE_ADDR &lowest) |
| { |
| CORE_ADDR start_addr; |
| int done; |
| ULONGEST align = ((ULONGEST) 1) << bfd_section_alignment (sect); |
| |
| /* We are only interested in allocated sections. */ |
| if ((bfd_section_flags (sect) & SEC_ALLOC) == 0) |
| return; |
| |
| /* If the user specified an offset, honor it. */ |
| if (offsets[gdb_bfd_section_index (abfd, sect)] != 0) |
| return; |
| |
| /* Otherwise, let's try to find a place for the section. */ |
| start_addr = (lowest + align - 1) & -align; |
| |
| do { |
| asection *cur_sec; |
| |
| done = 1; |
| |
| for (cur_sec = abfd->sections; cur_sec != NULL; cur_sec = cur_sec->next) |
| { |
| int indx = cur_sec->index; |
| |
| /* We don't need to compare against ourself. */ |
| if (cur_sec == sect) |
| continue; |
| |
| /* We can only conflict with allocated sections. */ |
| if ((bfd_section_flags (cur_sec) & SEC_ALLOC) == 0) |
| continue; |
| |
| /* If the section offset is 0, either the section has not been placed |
| yet, or it was the lowest section placed (in which case LOWEST |
| will be past its end). */ |
| if (offsets[indx] == 0) |
| continue; |
| |
| /* If this section would overlap us, then we must move up. */ |
| if (start_addr + bfd_section_size (sect) > offsets[indx] |
| && start_addr < offsets[indx] + bfd_section_size (cur_sec)) |
| { |
| start_addr = offsets[indx] + bfd_section_size (cur_sec); |
| start_addr = (start_addr + align - 1) & -align; |
| done = 0; |
| break; |
| } |
| |
| /* Otherwise, we appear to be OK. So far. */ |
| } |
| } |
| while (!done); |
| |
| offsets[gdb_bfd_section_index (abfd, sect)] = start_addr; |
| lowest = start_addr + bfd_section_size (sect); |
| } |
| |
| /* Store section_addr_info as prepared (made relative and with SECTINDEX |
| filled-in) by addr_info_make_relative into SECTION_OFFSETS. */ |
| |
| void |
| relative_addr_info_to_section_offsets (section_offsets §ion_offsets, |
| const section_addr_info &addrs) |
| { |
| int i; |
| |
| section_offsets.assign (section_offsets.size (), 0); |
| |
| /* Now calculate offsets for section that were specified by the caller. */ |
| for (i = 0; i < addrs.size (); i++) |
| { |
| const struct other_sections *osp; |
| |
| osp = &addrs[i]; |
| if (osp->sectindex == -1) |
| continue; |
| |
| /* Record all sections in offsets. */ |
| /* The section_offsets in the objfile are here filled in using |
| the BFD index. */ |
| section_offsets[osp->sectindex] = osp->addr; |
| } |
| } |
| |
| /* Transform section name S for a name comparison. prelink can split section |
| `.bss' into two sections `.dynbss' and `.bss' (in this order). Similarly |
| prelink can split `.sbss' into `.sdynbss' and `.sbss'. Use virtual address |
| of the new `.dynbss' (`.sdynbss') section as the adjacent new `.bss' |
| (`.sbss') section has invalid (increased) virtual address. */ |
| |
| static const char * |
| addr_section_name (const char *s) |
| { |
| if (strcmp (s, ".dynbss") == 0) |
| return ".bss"; |
| if (strcmp (s, ".sdynbss") == 0) |
| return ".sbss"; |
| |
| return s; |
| } |
| |
| /* std::sort comparator for addrs_section_sort. Sort entries in |
| ascending order by their (name, sectindex) pair. sectindex makes |
| the sort by name stable. */ |
| |
| static bool |
| addrs_section_compar (const struct other_sections *a, |
| const struct other_sections *b) |
| { |
| int retval; |
| |
| retval = strcmp (addr_section_name (a->name.c_str ()), |
| addr_section_name (b->name.c_str ())); |
| if (retval != 0) |
| return retval < 0; |
| |
| return a->sectindex < b->sectindex; |
| } |
| |
| /* Provide sorted array of pointers to sections of ADDRS. */ |
| |
| static std::vector<const struct other_sections *> |
| addrs_section_sort (const section_addr_info &addrs) |
| { |
| int i; |
| |
| std::vector<const struct other_sections *> array (addrs.size ()); |
| for (i = 0; i < addrs.size (); i++) |
| array[i] = &addrs[i]; |
| |
| std::sort (array.begin (), array.end (), addrs_section_compar); |
| |
| return array; |
| } |
| |
| /* Relativize absolute addresses in ADDRS into offsets based on ABFD. Fill-in |
| also SECTINDEXes specific to ABFD there. This function can be used to |
| rebase ADDRS to start referencing different BFD than before. */ |
| |
| void |
| addr_info_make_relative (section_addr_info *addrs, bfd *abfd) |
| { |
| asection *lower_sect; |
| CORE_ADDR lower_offset; |
| int i; |
| |
| /* Find lowest loadable section to be used as starting point for |
| contiguous sections. */ |
| lower_sect = NULL; |
| for (asection *iter : gdb_bfd_sections (abfd)) |
| find_lowest_section (iter, &lower_sect); |
| if (lower_sect == NULL) |
| { |
| warning (_("no loadable sections found in added symbol-file %s"), |
| bfd_get_filename (abfd)); |
| lower_offset = 0; |
| } |
| else |
| lower_offset = bfd_section_vma (lower_sect); |
| |
| /* Create ADDRS_TO_ABFD_ADDRS array to map the sections in ADDRS to sections |
| in ABFD. Section names are not unique - there can be multiple sections of |
| the same name. Also the sections of the same name do not have to be |
| adjacent to each other. Some sections may be present only in one of the |
| files. Even sections present in both files do not have to be in the same |
| order. |
| |
| Use stable sort by name for the sections in both files. Then linearly |
| scan both lists matching as most of the entries as possible. */ |
| |
| std::vector<const struct other_sections *> addrs_sorted |
| = addrs_section_sort (*addrs); |
| |
| section_addr_info abfd_addrs = build_section_addr_info_from_bfd (abfd); |
| std::vector<const struct other_sections *> abfd_addrs_sorted |
| = addrs_section_sort (abfd_addrs); |
| |
| /* Now create ADDRS_TO_ABFD_ADDRS from ADDRS_SORTED and |
| ABFD_ADDRS_SORTED. */ |
| |
| std::vector<const struct other_sections *> |
| addrs_to_abfd_addrs (addrs->size (), nullptr); |
| |
| std::vector<const struct other_sections *>::iterator abfd_sorted_iter |
| = abfd_addrs_sorted.begin (); |
| for (const other_sections *sect : addrs_sorted) |
| { |
| const char *sect_name = addr_section_name (sect->name.c_str ()); |
| |
| while (abfd_sorted_iter != abfd_addrs_sorted.end () |
| && strcmp (addr_section_name ((*abfd_sorted_iter)->name.c_str ()), |
| sect_name) < 0) |
| abfd_sorted_iter++; |
| |
| if (abfd_sorted_iter != abfd_addrs_sorted.end () |
| && strcmp (addr_section_name ((*abfd_sorted_iter)->name.c_str ()), |
| sect_name) == 0) |
| { |
| int index_in_addrs; |
| |
| /* Make the found item directly addressable from ADDRS. */ |
| index_in_addrs = sect - addrs->data (); |
| gdb_assert (addrs_to_abfd_addrs[index_in_addrs] == NULL); |
| addrs_to_abfd_addrs[index_in_addrs] = *abfd_sorted_iter; |
| |
| /* Never use the same ABFD entry twice. */ |
| abfd_sorted_iter++; |
| } |
| } |
| |
| /* Calculate offsets for the loadable sections. |
| FIXME! Sections must be in order of increasing loadable section |
| so that contiguous sections can use the lower-offset!!! |
| |
| Adjust offsets if the segments are not contiguous. |
| If the section is contiguous, its offset should be set to |
| the offset of the highest loadable section lower than it |
| (the loadable section directly below it in memory). |
| this_offset = lower_offset = lower_addr - lower_orig_addr */ |
| |
| for (i = 0; i < addrs->size (); i++) |
| { |
| const struct other_sections *sect = addrs_to_abfd_addrs[i]; |
| |
| if (sect) |
| { |
| /* This is the index used by BFD. */ |
| (*addrs)[i].sectindex = sect->sectindex; |
| |
| if ((*addrs)[i].addr != 0) |
| { |
| (*addrs)[i].addr -= sect->addr; |
| lower_offset = (*addrs)[i].addr; |
| } |
| else |
| (*addrs)[i].addr = lower_offset; |
| } |
| else |
| { |
| /* addr_section_name transformation is not used for SECT_NAME. */ |
| const std::string §_name = (*addrs)[i].name; |
| |
| /* This section does not exist in ABFD, which is normally |
| unexpected and we want to issue a warning. |
| |
| However, the ELF prelinker does create a few sections which are |
| marked in the main executable as loadable (they are loaded in |
| memory from the DYNAMIC segment) and yet are not present in |
| separate debug info files. This is fine, and should not cause |
| a warning. Shared libraries contain just the section |
| ".gnu.liblist" but it is not marked as loadable there. There is |
| no other way to identify them than by their name as the sections |
| created by prelink have no special flags. |
| |
| For the sections `.bss' and `.sbss' see addr_section_name. */ |
| |
| if (!(sect_name == ".gnu.liblist" |
| || sect_name == ".gnu.conflict" |
| || (sect_name == ".bss" |
| && i > 0 |
| && (*addrs)[i - 1].name == ".dynbss" |
| && addrs_to_abfd_addrs[i - 1] != NULL) |
| || (sect_name == ".sbss" |
| && i > 0 |
| && (*addrs)[i - 1].name == ".sdynbss" |
| && addrs_to_abfd_addrs[i - 1] != NULL))) |
| warning (_("section %s not found in %s"), sect_name.c_str (), |
| bfd_get_filename (abfd)); |
| |
| (*addrs)[i].addr = 0; |
| (*addrs)[i].sectindex = -1; |
| } |
| } |
| } |
| |
| /* Parse the user's idea of an offset for dynamic linking, into our idea |
| of how to represent it for fast symbol reading. This is the default |
| version of the sym_fns.sym_offsets function for symbol readers that |
| don't need to do anything special. It allocates a section_offsets table |
| for the objectfile OBJFILE and stuffs ADDR into all of the offsets. */ |
| |
| void |
| default_symfile_offsets (struct objfile *objfile, |
| const section_addr_info &addrs) |
| { |
| objfile->section_offsets.resize (gdb_bfd_count_sections (objfile->obfd.get ())); |
| relative_addr_info_to_section_offsets (objfile->section_offsets, addrs); |
| |
| /* For relocatable files, all loadable sections will start at zero. |
| The zero is meaningless, so try to pick arbitrary addresses such |
| that no loadable sections overlap. This algorithm is quadratic, |
| but the number of sections in a single object file is generally |
| small. */ |
| if ((bfd_get_file_flags (objfile->obfd.get ()) & (EXEC_P | DYNAMIC)) == 0) |
| { |
| bfd *abfd = objfile->obfd.get (); |
| asection *cur_sec; |
| |
| for (cur_sec = abfd->sections; cur_sec != NULL; cur_sec = cur_sec->next) |
| /* We do not expect this to happen; just skip this step if the |
| relocatable file has a section with an assigned VMA. */ |
| if (bfd_section_vma (cur_sec) != 0) |
| break; |
| |
| if (cur_sec == NULL) |
| { |
| section_offsets &offsets = objfile->section_offsets; |
| |
| /* Pick non-overlapping offsets for sections the user did not |
| place explicitly. */ |
| CORE_ADDR lowest = 0; |
| for (asection *sect : gdb_bfd_sections (objfile->obfd.get ())) |
| place_section (objfile->obfd.get (), sect, objfile->section_offsets, |
| lowest); |
| |
| /* Correctly filling in the section offsets is not quite |
| enough. Relocatable files have two properties that |
| (most) shared objects do not: |
| |
| - Their debug information will contain relocations. Some |
| shared libraries do also, but many do not, so this can not |
| be assumed. |
| |
| - If there are multiple code sections they will be loaded |
| at different relative addresses in memory than they are |
| in the objfile, since all sections in the file will start |
| at address zero. |
| |
| Because GDB has very limited ability to map from an |
| address in debug info to the correct code section, |
| it relies on adding SECT_OFF_TEXT to things which might be |
| code. If we clear all the section offsets, and set the |
| section VMAs instead, then symfile_relocate_debug_section |
| will return meaningful debug information pointing at the |
| correct sections. |
| |
| GDB has too many different data structures for section |
| addresses - a bfd, objfile, and so_list all have section |
| tables, as does exec_ops. Some of these could probably |
| be eliminated. */ |
| |
| for (cur_sec = abfd->sections; cur_sec != NULL; |
| cur_sec = cur_sec->next) |
| { |
| if ((bfd_section_flags (cur_sec) & SEC_ALLOC) == 0) |
| continue; |
| |
| bfd_set_section_vma (cur_sec, offsets[cur_sec->index]); |
| exec_set_section_address (bfd_get_filename (abfd), |
| cur_sec->index, |
| offsets[cur_sec->index]); |
| offsets[cur_sec->index] = 0; |
| } |
| } |
| } |
| |
| /* Remember the bfd indexes for the .text, .data, .bss and |
| .rodata sections. */ |
| init_objfile_sect_indices (objfile); |
| } |
| |
| /* Divide the file into segments, which are individual relocatable units. |
| This is the default version of the sym_fns.sym_segments function for |
| symbol readers that do not have an explicit representation of segments. |
| It assumes that object files do not have segments, and fully linked |
| files have a single segment. */ |
| |
| symfile_segment_data_up |
| default_symfile_segments (bfd *abfd) |
| { |
| int num_sections, i; |
| asection *sect; |
| CORE_ADDR low, high; |
| |
| /* Relocatable files contain enough information to position each |
| loadable section independently; they should not be relocated |
| in segments. */ |
| if ((bfd_get_file_flags (abfd) & (EXEC_P | DYNAMIC)) == 0) |
| return NULL; |
| |
| /* Make sure there is at least one loadable section in the file. */ |
| for (sect = abfd->sections; sect != NULL; sect = sect->next) |
| { |
| if ((bfd_section_flags (sect) & SEC_ALLOC) == 0) |
| continue; |
| |
| break; |
| } |
| if (sect == NULL) |
| return NULL; |
| |
| low = bfd_section_vma (sect); |
| high = low + bfd_section_size (sect); |
| |
| symfile_segment_data_up data (new symfile_segment_data); |
| |
| num_sections = bfd_count_sections (abfd); |
| |
| /* All elements are initialized to 0 (map to no segment). */ |
| data->segment_info.resize (num_sections); |
| |
| for (i = 0, sect = abfd->sections; sect != NULL; i++, sect = sect->next) |
| { |
| CORE_ADDR vma; |
| |
| if ((bfd_section_flags (sect) & SEC_ALLOC) == 0) |
| continue; |
| |
| vma = bfd_section_vma (sect); |
| if (vma < low) |
| low = vma; |
| if (vma + bfd_section_size (sect) > high) |
| high = vma + bfd_section_size (sect); |
| |
| data->segment_info[i] = 1; |
| } |
| |
| data->segments.emplace_back (low, high - low); |
| |
| return data; |
| } |
| |
| /* This is a convenience function to call sym_read for OBJFILE and |
| possibly force the partial symbols to be read. */ |
| |
| static void |
| read_symbols (struct objfile *objfile, symfile_add_flags add_flags) |
| { |
| (*objfile->sf->sym_read) (objfile, add_flags); |
| objfile->per_bfd->minsyms_read = true; |
| |
| /* find_separate_debug_file_in_section should be called only if there is |
| single binary with no existing separate debug info file. */ |
| if (!objfile->has_partial_symbols () |
| && objfile->separate_debug_objfile == NULL |
| && objfile->separate_debug_objfile_backlink == NULL) |
| { |
| gdb_bfd_ref_ptr abfd (find_separate_debug_file_in_section (objfile)); |
| |
| if (abfd != NULL) |
| { |
| /* find_separate_debug_file_in_section uses the same filename for the |
| virtual section-as-bfd like the bfd filename containing the |
| section. Therefore use also non-canonical name form for the same |
| file containing the section. */ |
| symbol_file_add_separate (abfd, bfd_get_filename (abfd.get ()), |
| add_flags | SYMFILE_NOT_FILENAME, objfile); |
| } |
| } |
| } |
| |
| /* Initialize entry point information for this objfile. */ |
| |
| static void |
| init_entry_point_info (struct objfile *objfile) |
| { |
| struct entry_info *ei = &objfile->per_bfd->ei; |
| |
| if (ei->initialized) |
| return; |
| ei->initialized = 1; |
| |
| /* Save startup file's range of PC addresses to help blockframe.c |
| decide where the bottom of the stack is. */ |
| |
| if (bfd_get_file_flags (objfile->obfd.get ()) & EXEC_P) |
| { |
| /* Executable file -- record its entry point so we'll recognize |
| the startup file because it contains the entry point. */ |
| ei->entry_point = bfd_get_start_address (objfile->obfd.get ()); |
| ei->entry_point_p = 1; |
| } |
| else if (bfd_get_file_flags (objfile->obfd.get ()) & DYNAMIC |
| && bfd_get_start_address (objfile->obfd.get ()) != 0) |
| { |
| /* Some shared libraries may have entry points set and be |
| runnable. There's no clear way to indicate this, so just check |
| for values other than zero. */ |
| ei->entry_point = bfd_get_start_address (objfile->obfd.get ()); |
| ei->entry_point_p = 1; |
| } |
| else |
| { |
| /* Examination of non-executable.o files. Short-circuit this stuff. */ |
| ei->entry_point_p = 0; |
| } |
| |
| if (ei->entry_point_p) |
| { |
| CORE_ADDR entry_point = ei->entry_point; |
| int found; |
| |
| /* Make certain that the address points at real code, and not a |
| function descriptor. */ |
| entry_point = gdbarch_convert_from_func_ptr_addr |
| (objfile->arch (), entry_point, current_inferior ()->top_target ()); |
| |
| /* Remove any ISA markers, so that this matches entries in the |
| symbol table. */ |
| ei->entry_point |
| = gdbarch_addr_bits_remove (objfile->arch (), entry_point); |
| |
| found = 0; |
| for (obj_section *osect : objfile->sections ()) |
| { |
| struct bfd_section *sect = osect->the_bfd_section; |
| |
| if (entry_point >= bfd_section_vma (sect) |
| && entry_point < (bfd_section_vma (sect) |
| + bfd_section_size (sect))) |
| { |
| ei->the_bfd_section_index |
| = gdb_bfd_section_index (objfile->obfd.get (), sect); |
| found = 1; |
| break; |
| } |
| } |
| |
| if (!found) |
| ei->the_bfd_section_index = SECT_OFF_TEXT (objfile); |
| } |
| } |
| |
| /* Process a symbol file, as either the main file or as a dynamically |
| loaded file. |
| |
| This function does not set the OBJFILE's entry-point info. |
| |
| OBJFILE is where the symbols are to be read from. |
| |
| ADDRS is the list of section load addresses. If the user has given |
| an 'add-symbol-file' command, then this is the list of offsets and |
| addresses he or she provided as arguments to the command; or, if |
| we're handling a shared library, these are the actual addresses the |
| sections are loaded at, according to the inferior's dynamic linker |
| (as gleaned by GDB's shared library code). We convert each address |
| into an offset from the section VMA's as it appears in the object |
| file, and then call the file's sym_offsets function to convert this |
| into a format-specific offset table --- a `section_offsets'. |
| The sectindex field is used to control the ordering of sections |
| with the same name. Upon return, it is updated to contain the |
| corresponding BFD section index, or -1 if the section was not found. |
| |
| ADD_FLAGS encodes verbosity level, whether this is main symbol or |
| an extra symbol file such as dynamically loaded code, and whether |
| breakpoint reset should be deferred. */ |
| |
| static void |
| syms_from_objfile_1 (struct objfile *objfile, |
| section_addr_info *addrs, |
| symfile_add_flags add_flags) |
| { |
| section_addr_info local_addr; |
| const int mainline = add_flags & SYMFILE_MAINLINE; |
| |
| objfile_set_sym_fns (objfile, find_sym_fns (objfile->obfd.get ())); |
| objfile->qf.clear (); |
| |
| if (objfile->sf == NULL) |
| { |
| /* No symbols to load, but we still need to make sure |
| that the section_offsets table is allocated. */ |
| int num_sections = gdb_bfd_count_sections (objfile->obfd.get ()); |
| |
| objfile->section_offsets.assign (num_sections, 0); |
| return; |
| } |
| |
| /* Make sure that partially constructed symbol tables will be cleaned up |
| if an error occurs during symbol reading. */ |
| std::optional<clear_symtab_users_cleanup> defer_clear_users; |
| |
| objfile_up objfile_holder (objfile); |
| |
| /* If ADDRS is NULL, put together a dummy address list. |
| We now establish the convention that an addr of zero means |
| no load address was specified. */ |
| if (! addrs) |
| addrs = &local_addr; |
| |
| if (mainline) |
| { |
| /* We will modify the main symbol table, make sure that all its users |
| will be cleaned up if an error occurs during symbol reading. */ |
| defer_clear_users.emplace ((symfile_add_flag) 0); |
| |
| /* Since no error yet, throw away the old symbol table. */ |
| |
| if (current_program_space->symfile_object_file != NULL) |
| { |
| current_program_space->symfile_object_file->unlink (); |
| gdb_assert (current_program_space->symfile_object_file == NULL); |
| } |
| |
| /* Currently we keep symbols from the add-symbol-file command. |
| If the user wants to get rid of them, they should do "symbol-file" |
| without arguments first. Not sure this is the best behavior |
| (PR 2207). */ |
| |
| (*objfile->sf->sym_new_init) (objfile); |
| } |
| |
| /* Convert addr into an offset rather than an absolute address. |
| We find the lowest address of a loaded segment in the objfile, |
| and assume that <addr> is where that got loaded. |
| |
| We no longer warn if the lowest section is not a text segment (as |
| happens for the PA64 port. */ |
| if (addrs->size () > 0) |
| addr_info_make_relative (addrs, objfile->obfd.get ()); |
| |
| /* Initialize symbol reading routines for this objfile, allow complaints to |
| appear for this new file, and record how verbose to be, then do the |
| initial symbol reading for this file. */ |
| |
| (*objfile->sf->sym_init) (objfile); |
| clear_complaints (); |
| |
| (*objfile->sf->sym_offsets) (objfile, *addrs); |
| |
| read_symbols (objfile, add_flags); |
| |
| /* Discard cleanups as symbol reading was successful. */ |
| |
| objfile_holder.release (); |
| if (defer_clear_users) |
| defer_clear_users->release (); |
| } |
| |
| /* Same as syms_from_objfile_1, but also initializes the objfile |
| entry-point info. */ |
| |
| static void |
| syms_from_objfile (struct objfile *objfile, |
| section_addr_info *addrs, |
| symfile_add_flags add_flags) |
| { |
| syms_from_objfile_1 (objfile, addrs, add_flags); |
| init_entry_point_info (objfile); |
| } |
| |
| /* Perform required actions after either reading in the initial |
| symbols for a new objfile, or mapping in the symbols from a reusable |
| objfile. ADD_FLAGS is a bitmask of enum symfile_add_flags. */ |
| |
| static void |
| finish_new_objfile (struct objfile *objfile, symfile_add_flags add_flags) |
| { |
| /* If this is the main symbol file we have to clean up all users of the |
| old main symbol file. Otherwise it is sufficient to fixup all the |
| breakpoints that may have been redefined by this symbol file. */ |
| if (add_flags & SYMFILE_MAINLINE) |
| { |
| /* OK, make it the "real" symbol file. */ |
| current_program_space->symfile_object_file = objfile; |
| |
| clear_symtab_users (add_flags); |
| } |
| else if ((add_flags & SYMFILE_DEFER_BP_RESET) == 0) |
| { |
| breakpoint_re_set (); |
| } |
| |
| /* We're done reading the symbol file; finish off complaints. */ |
| clear_complaints (); |
| } |
| |
| /* Process a symbol file, as either the main file or as a dynamically |
| loaded file. |
| |
| ABFD is a BFD already open on the file, as from symfile_bfd_open. |
| A new reference is acquired by this function. |
| |
| For NAME description see the objfile constructor. |
| |
| ADD_FLAGS encodes verbosity, whether this is main symbol file or |
| extra, such as dynamically loaded code, and what to do with breakpoints. |
| |
| ADDRS is as described for syms_from_objfile_1, above. |
| ADDRS is ignored when SYMFILE_MAINLINE bit is set in ADD_FLAGS. |
| |
| PARENT is the original objfile if ABFD is a separate debug info file. |
| Otherwise PARENT is NULL. |
| |
| Upon success, returns a pointer to the objfile that was added. |
| Upon failure, jumps back to command level (never returns). */ |
| |
| static struct objfile * |
| symbol_file_add_with_addrs (const gdb_bfd_ref_ptr &abfd, const char *name, |
| symfile_add_flags add_flags, |
| section_addr_info *addrs, |
| objfile_flags flags, struct objfile *parent) |
| { |
| const int from_tty = add_flags & SYMFILE_VERBOSE; |
| const int mainline = add_flags & SYMFILE_MAINLINE; |
| const int always_confirm = add_flags & SYMFILE_ALWAYS_CONFIRM; |
| const int should_print = (print_symbol_loading_p (from_tty, mainline, 1) |
| && (readnow_symbol_files |
| || (add_flags & SYMFILE_NO_READ) == 0)); |
| |
| if (readnow_symbol_files) |
| { |
| flags |= OBJF_READNOW; |
| add_flags &= ~SYMFILE_NO_READ; |
| } |
| else if (readnever_symbol_files |
| || (parent != NULL && (parent->flags & OBJF_READNEVER))) |
| { |
| flags |= OBJF_READNEVER; |
| add_flags |= SYMFILE_NO_READ; |
| } |
| if ((add_flags & SYMFILE_NOT_FILENAME) != 0) |
| flags |= OBJF_NOT_FILENAME; |
| |
| /* Give user a chance to burp if ALWAYS_CONFIRM or we'd be |
| interactively wiping out any existing symbols. */ |
| |
| if (from_tty |
| && (always_confirm |
| || ((have_full_symbols (current_program_space) |
| || have_partial_symbols (current_program_space)) |
| && mainline)) |
| && !query (_ ("Load new symbol table from \"%s\"? "), name)) |
| error (_("Not confirmed.")); |
| |
| if (mainline) |
| flags |= OBJF_MAINLINE; |
| |
| objfile *objfile |
| = objfile::make (abfd, current_program_space, name, flags, parent); |
| |
| /* We either created a new mapped symbol table, mapped an existing |
| symbol table file which has not had initial symbol reading |
| performed, or need to read an unmapped symbol table. */ |
| if (should_print) |
| { |
| if (deprecated_pre_add_symbol_hook) |
| deprecated_pre_add_symbol_hook (name); |
| else |
| gdb_printf (_("Reading symbols from %ps...\n"), |
| styled_string (file_name_style.style (), name)); |
| } |
| syms_from_objfile (objfile, addrs, add_flags); |
| |
| /* We now have at least a partial symbol table. Check to see if the |
| user requested that all symbols be read on initial access via either |
| the gdb startup command line or on a per symbol file basis. Expand |
| all partial symbol tables for this objfile if so. */ |
| |
| if ((flags & OBJF_READNOW)) |
| { |
| if (should_print) |
| gdb_printf (_("Expanding full symbols from %ps...\n"), |
| styled_string (file_name_style.style (), name)); |
| |
| objfile->expand_all_symtabs (); |
| } |
| |
| /* Note that we only print a message if we have no symbols and have |
| no separate debug file. If there is a separate debug file which |
| does not have symbols, we'll have emitted this message for that |
| file, and so printing it twice is just redundant. */ |
| if (should_print && !objfile_has_symbols (objfile) |
| && objfile->separate_debug_objfile == nullptr) |
| gdb_printf (_("(No debugging symbols found in %ps)\n"), |
| styled_string (file_name_style.style (), name)); |
| |
| if (should_print) |
| { |
| if (deprecated_post_add_symbol_hook) |
| deprecated_post_add_symbol_hook (); |
| } |
| |
| /* We print some messages regardless of whether 'from_tty || |
| info_verbose' is true, so make sure they go out at the right |
| time. */ |
| gdb_flush (gdb_stdout); |
| |
| if (objfile->sf != nullptr) |
| finish_new_objfile (objfile, add_flags); |
| |
| gdb::observers::new_objfile.notify (objfile); |
| |
| return objfile; |
| } |
| |
| /* Add BFD as a separate debug file for OBJFILE. For NAME description |
| see the objfile constructor. */ |
| |
| void |
| symbol_file_add_separate (const gdb_bfd_ref_ptr &bfd, const char *name, |
| symfile_add_flags symfile_flags, |
| struct objfile *objfile) |
| { |
| /* Create section_addr_info. We can't directly use offsets from OBJFILE |
| because sections of BFD may not match sections of OBJFILE and because |
| vma may have been modified by tools such as prelink. */ |
| section_addr_info sap = build_section_addr_info_from_objfile (objfile); |
| |
| symbol_file_add_with_addrs |
| (bfd, name, symfile_flags, &sap, |
| objfile->flags & (OBJF_SHARED | OBJF_READNOW |
| | OBJF_USERLOADED | OBJF_MAINLINE), |
| objfile); |
| } |
| |
| /* Process the symbol file ABFD, as either the main file or as a |
| dynamically loaded file. |
| See symbol_file_add_with_addrs's comments for details. */ |
| |
| struct objfile * |
| symbol_file_add_from_bfd (const gdb_bfd_ref_ptr &abfd, const char *name, |
| symfile_add_flags add_flags, |
| section_addr_info *addrs, |
| objfile_flags flags, struct objfile *parent) |
| { |
| return symbol_file_add_with_addrs (abfd, name, add_flags, addrs, flags, |
| parent); |
| } |
| |
| /* Process a symbol file, as either the main file or as a dynamically |
| loaded file. See symbol_file_add_with_addrs's comments for details. */ |
| |
| struct objfile * |
| symbol_file_add (const char *name, symfile_add_flags add_flags, |
| section_addr_info *addrs, objfile_flags flags) |
| { |
| gdb_bfd_ref_ptr bfd (symfile_bfd_open (name)); |
| |
| return symbol_file_add_from_bfd (bfd, name, add_flags, addrs, |
| flags, NULL); |
| } |
| |
| /* Call symbol_file_add() with default values and update whatever is |
| affected by the loading of a new main(). |
| Used when the file is supplied in the gdb command line |
| and by some targets with special loading requirements. |
| The auxiliary function, symbol_file_add_main_1(), has the flags |
| argument for the switches that can only be specified in the symbol_file |
| command itself. */ |
| |
| void |
| symbol_file_add_main (const char *args, symfile_add_flags add_flags) |
| { |
| symbol_file_add_main_1 (args, add_flags, 0, 0); |
| } |
| |
| static void |
| symbol_file_add_main_1 (const char *args, symfile_add_flags add_flags, |
| objfile_flags flags, CORE_ADDR reloff) |
| { |
| add_flags |= current_inferior ()->symfile_flags | SYMFILE_MAINLINE; |
| |
| struct objfile *objfile = symbol_file_add (args, add_flags, NULL, flags); |
| if (reloff != 0) |
| objfile_rebase (objfile, reloff); |
| |
| /* Getting new symbols may change our opinion about |
| what is frameless. */ |
| reinit_frame_cache (); |
| |
| if ((add_flags & SYMFILE_NO_READ) == 0) |
| set_initial_language (); |
| } |
| |
| void |
| symbol_file_clear (int from_tty) |
| { |
| if ((have_full_symbols (current_program_space) |
| || have_partial_symbols (current_program_space)) |
| && from_tty |
| && (current_program_space->symfile_object_file |
| ? !query (_("Discard symbol table from `%s'? "), |
| objfile_name (current_program_space->symfile_object_file)) |
| : !query (_("Discard symbol table? ")))) |
| error (_("Not confirmed.")); |
| |
| /* solib descriptors may have handles to objfiles. Wipe them before their |
| objfiles get stale by free_all_objfiles. */ |
| no_shared_libraries (current_program_space); |
| |
| current_program_space->free_all_objfiles (); |
| |
| clear_symtab_users (0); |
| |
| gdb_assert (current_program_space->symfile_object_file == NULL); |
| if (from_tty) |
| gdb_printf (_("No symbol file now.\n")); |
| } |
| |
| /* See symfile.h. */ |
| |
| bool separate_debug_file_debug = false; |
| |
| static int |
| separate_debug_file_exists (const std::string &name, unsigned long crc, |
| struct objfile *parent_objfile, |
| deferred_warnings *warnings) |
| { |
| SEPARATE_DEBUG_FILE_SCOPED_DEBUG_ENTER_EXIT; |
| |
| unsigned long file_crc; |
| int file_crc_p; |
| struct stat parent_stat, abfd_stat; |
| int verified_as_different; |
| |
| /* Find a separate debug info file as if symbols would be present in |
| PARENT_OBJFILE itself this function would not be called. .gnu_debuglink |
| section can contain just the basename of PARENT_OBJFILE without any |
| ".debug" suffix as "/usr/lib/debug/path/to/file" is a separate tree where |
| the separate debug infos with the same basename can exist. */ |
| |
| if (filename_cmp (name.c_str (), objfile_name (parent_objfile)) == 0) |
| return 0; |
| |
| separate_debug_file_debug_printf ("Trying %s...", name.c_str ()); |
| |
| gdb_bfd_ref_ptr abfd (gdb_bfd_open (name.c_str (), gnutarget)); |
| |
| if (abfd == NULL) |
| { |
| separate_debug_file_debug_printf ("unable to open file"); |
| return 0; |
| } |
| |
| /* Verify symlinks were not the cause of filename_cmp name difference above. |
| |
| Some operating systems, e.g. Windows, do not provide a meaningful |
| st_ino; they always set it to zero. (Windows does provide a |
| meaningful st_dev.) Files accessed from gdbservers that do not |
| support the vFile:fstat packet will also have st_ino set to zero. |
| Do not indicate a duplicate library in either case. While there |
| is no guarantee that a system that provides meaningful inode |
| numbers will never set st_ino to zero, this is merely an |
| optimization, so we do not need to worry about false negatives. */ |
| |
| if (bfd_stat (abfd.get (), &abfd_stat) == 0 |
| && abfd_stat.st_ino != 0 |
| && bfd_stat (parent_objfile->obfd.get (), &parent_stat) == 0) |
| { |
| if (abfd_stat.st_dev == parent_stat.st_dev |
| && abfd_stat.st_ino == parent_stat.st_ino) |
| { |
| separate_debug_file_debug_printf ("same file as the objfile"); |
| return 0; |
| } |
| verified_as_different = 1; |
| } |
| else |
| verified_as_different = 0; |
| |
| file_crc_p = gdb_bfd_crc (abfd.get (), &file_crc); |
| |
| if (!file_crc_p) |
| { |
| separate_debug_file_debug_printf ("error computing CRC"); |
| return 0; |
| } |
| |
| if (crc != file_crc) |
| { |
| unsigned long parent_crc; |
| |
| /* If the files could not be verified as different with |
| bfd_stat then we need to calculate the parent's CRC |
| to verify whether the files are different or not. */ |
| |
| if (!verified_as_different) |
| { |
| if (!gdb_bfd_crc (parent_objfile->obfd.get (), &parent_crc)) |
| { |
| separate_debug_file_debug_printf ("error computing CRC"); |
| return 0; |
| } |
| } |
| |
| if (verified_as_different || parent_crc != file_crc) |
| { |
| separate_debug_file_debug_printf |
| ("the debug information found in \"%s\" does not match " |
| "\"%s\" (CRC mismatch).", name.c_str (), |
| objfile_name (parent_objfile)); |
| |
| warnings->warn (_("the debug information found in \"%ps\"" |
| " does not match \"%ps\" (CRC mismatch)."), |
| styled_string (file_name_style.style (), |
| name.c_str ()), |
| styled_string (file_name_style.style (), |
| objfile_name (parent_objfile))); |
| } |
| |
| return 0; |
| } |
| |
| separate_debug_file_debug_printf ("found a match"); |
| |
| return 1; |
| } |
| |
| std::string debug_file_directory; |
| static void |
| show_debug_file_directory (struct ui_file *file, int from_tty, |
| struct cmd_list_element *c, const char *value) |
| { |
| gdb_printf (file, |
| _("The directory where separate debug " |
| "symbols are searched for is \"%s\".\n"), |
| value); |
| } |
| |
| #if ! defined (DEBUG_SUBDIRECTORY) |
| #define DEBUG_SUBDIRECTORY ".debug" |
| #endif |
| |
| /* Find a separate debuginfo file for OBJFILE, using DIR as the directory |
| where the original file resides (may not be the same as |
| dirname(objfile->name) due to symlinks), and DEBUGLINK as the file we are |
| looking for. CANON_DIR is the "realpath" form of DIR. |
| DIR must contain a trailing '/'. |
| Returns the path of the file with separate debug info, or an empty |
| string. |
| |
| Any warnings generated as part of the lookup process are added to |
| WARNINGS. If some other mechanism can be used to lookup the debug |
| information then the warning will not be shown, however, if GDB fails to |
| find suitable debug information using any approach, then any warnings |
| will be printed. */ |
| |
| static std::string |
| find_separate_debug_file (const char *dir, |
| const char *canon_dir, |
| const char *debuglink, |
| unsigned long crc32, struct objfile *objfile, |
| deferred_warnings *warnings) |
| { |
| SEPARATE_DEBUG_FILE_SCOPED_DEBUG_START_END |
| ("looking for separate debug info (debug link) for %s", |
| objfile_name (objfile)); |
| |
| /* First try in the same directory as the original file. */ |
| std::string debugfile = path_join (dir, debuglink); |
| |
| if (separate_debug_file_exists (debugfile, crc32, objfile, warnings)) |
| return debugfile; |
| |
| /* Then try in the subdirectory named DEBUG_SUBDIRECTORY. */ |
| debugfile = path_join (dir, DEBUG_SUBDIRECTORY, debuglink); |
| |
| if (separate_debug_file_exists (debugfile, crc32, objfile, warnings)) |
| return debugfile; |
| |
| /* Then try in the global debugfile directories. |
| |
| Keep backward compatibility so that DEBUG_FILE_DIRECTORY being "" will |
| cause "/..." lookups. */ |
| |
| bool target_prefix = is_target_filename (dir); |
| const char *dir_notarget |
| = target_prefix ? dir + strlen (TARGET_SYSROOT_PREFIX) : dir; |
| const char *target_prefix_str = target_prefix ? TARGET_SYSROOT_PREFIX : ""; |
| std::vector<gdb::unique_xmalloc_ptr<char>> debugdir_vec |
| = dirnames_to_char_ptr_vec (debug_file_directory.c_str ()); |
| const char *sysroot_str = gdb_sysroot.c_str (); |
| if (is_target_filename (sysroot_str) && target_filesystem_is_local ()) |
| sysroot_str += strlen (TARGET_SYSROOT_PREFIX); |
| gdb::unique_xmalloc_ptr<char> canon_sysroot = gdb_realpath (sysroot_str); |
| |
| /* MS-Windows/MS-DOS don't allow colons in file names; we must |
| convert the drive letter into a one-letter directory, so that the |
| file name resulting from splicing below will be valid. |
| |
| FIXME: The below only works when GDB runs on MS-Windows/MS-DOS. |
| There are various remote-debugging scenarios where such a |
| transformation of the drive letter might be required when GDB runs |
| on a Posix host, see |
| |
| https://sourceware.org/ml/gdb-patches/2019-04/msg00605.html |
| |
| If some of those scenarios need to be supported, we will need to |
| use a different condition for HAS_DRIVE_SPEC and a different macro |
| instead of STRIP_DRIVE_SPEC, which work on Posix systems as well. */ |
| std::string drive; |
| if (HAS_DRIVE_SPEC (dir_notarget)) |
| { |
| drive = dir_notarget[0]; |
| dir_notarget = STRIP_DRIVE_SPEC (dir_notarget); |
| } |
| |
| for (const gdb::unique_xmalloc_ptr<char> &debugdir : debugdir_vec) |
| { |
| debugfile = path_join (target_prefix_str, debugdir.get (), |
| drive.c_str (), dir_notarget, debuglink); |
| |
| if (separate_debug_file_exists (debugfile, crc32, objfile, warnings)) |
| return debugfile; |
| |
| const char *base_path = NULL; |
| if (canon_dir != NULL) |
| { |
| if (canon_sysroot.get () != NULL) |
| base_path = child_path (canon_sysroot.get (), canon_dir); |
| else |
| base_path = child_path (gdb_sysroot.c_str (), canon_dir); |
| } |
| if (base_path != NULL) |
| { |
| /* If the file is in the sysroot, try using its base path in |
| the global debugfile directory. */ |
| debugfile = path_join (target_prefix_str, debugdir.get (), |
| base_path, debuglink); |
| |
| if (separate_debug_file_exists (debugfile, crc32, objfile, warnings)) |
| return debugfile; |
| |
| /* If the file is in the sysroot, try using its base path in |
| the sysroot's global debugfile directory. */ |
| if (gdb_sysroot != TARGET_SYSROOT_PREFIX) |
| { |
| debugfile = path_join (gdb_sysroot.c_str (), debugdir.get (), |
| base_path, debuglink); |
| |
| if (separate_debug_file_exists (debugfile, crc32, objfile, |
| warnings)) |
| return debugfile; |
| } |
| } |
| } |
| |
| return std::string (); |
| } |
| |
| /* Modify PATH to contain only "[/]directory/" part of PATH. |
| If there were no directory separators in PATH, PATH will be empty |
| string on return. */ |
| |
| static void |
| terminate_after_last_dir_separator (char *path) |
| { |
| int i; |
| |
| /* Strip off the final filename part, leaving the directory name, |
| followed by a slash. The directory can be relative or absolute. */ |
| for (i = strlen(path) - 1; i >= 0; i--) |
| if (IS_DIR_SEPARATOR (path[i])) |
| break; |
| |
| /* If I is -1 then no directory is present there and DIR will be "". */ |
| path[i + 1] = '\0'; |
| } |
| |
| /* See symtab.h. */ |
| |
| std::string |
| find_separate_debug_file_by_debuglink |
| (struct objfile *objfile, deferred_warnings *warnings) |
| { |
| uint32_t crc32; |
| |
| gdb::unique_xmalloc_ptr<char> debuglink |
| (bfd_get_debug_link_info (objfile->obfd.get (), &crc32)); |
| |
| if (debuglink == NULL) |
| { |
| /* There's no separate debug info, hence there's no way we could |
| load it => no warning. */ |
| return std::string (); |
| } |
| |
| std::string dir = objfile_name (objfile); |
| terminate_after_last_dir_separator (&dir[0]); |
| gdb::unique_xmalloc_ptr<char> canon_dir (lrealpath (dir.c_str ())); |
| |
| std::string debugfile |
| = find_separate_debug_file (dir.c_str (), canon_dir.get (), |
| debuglink.get (), crc32, objfile, |
| warnings); |
| |
| if (debugfile.empty ()) |
| { |
| /* For PR gdb/9538, try again with realpath (if different from the |
| original). */ |
| |
| struct stat st_buf; |
| |
| if (lstat (objfile_name (objfile), &st_buf) == 0 |
| && S_ISLNK (st_buf.st_mode)) |
| { |
| gdb::unique_xmalloc_ptr<char> symlink_dir |
| (lrealpath (objfile_name (objfile))); |
| if (symlink_dir != NULL) |
| { |
| terminate_after_last_dir_separator (symlink_dir.get ()); |
| if (dir != symlink_dir.get ()) |
| { |
| /* Different directory, so try using it. */ |
| debugfile = find_separate_debug_file (symlink_dir.get (), |
| symlink_dir.get (), |
| debuglink.get (), |
| crc32, |
| objfile, |
| warnings); |
| } |
| } |
| } |
| } |
| |
| return debugfile; |
| } |
| |
| /* Make sure that OBJF_{READNOW,READNEVER} are not set |
| simultaneously. */ |
| |
| static void |
| validate_readnow_readnever (objfile_flags flags) |
| { |
| if ((flags & OBJF_READNOW) && (flags & OBJF_READNEVER)) |
| error (_("-readnow and -readnever cannot be used simultaneously")); |
| } |
| |
| /* See symfile.h. */ |
| |
| void |
| symbol_file_command (const char *args, int from_tty) |
| { |
| dont_repeat (); |
| |
| if (args == NULL) |
| { |
| symbol_file_clear (from_tty); |
| } |
| else |
| { |
| objfile_flags flags = OBJF_USERLOADED; |
| symfile_add_flags add_flags = 0; |
| char *name = NULL; |
| bool stop_processing_options = false; |
| CORE_ADDR offset = 0; |
| int idx; |
| char *arg; |
| |
| if (from_tty) |
| add_flags |= SYMFILE_VERBOSE; |
| |
| gdb_argv built_argv (args); |
| for (arg = built_argv[0], idx = 0; arg != NULL; arg = built_argv[++idx]) |
| { |
| if (stop_processing_options || *arg != '-') |
| { |
| if (name == NULL) |
| name = arg; |
| else |
| error (_("Unrecognized argument \"%s\""), arg); |
| } |
| else if (strcmp (arg, "-readnow") == 0) |
| flags |= OBJF_READNOW; |
| else if (strcmp (arg, "-readnever") == 0) |
| flags |= OBJF_READNEVER; |
| else if (strcmp (arg, "-o") == 0) |
| { |
| arg = built_argv[++idx]; |
| if (arg == NULL) |
| error (_("Missing argument to -o")); |
| |
| offset = parse_and_eval_address (arg); |
| } |
| else if (strcmp (arg, "--") == 0) |
| stop_processing_options = true; |
| else |
| error (_("Unrecognized argument \"%s\""), arg); |
| } |
| |
| if (name == NULL) |
| error (_("no symbol file name was specified")); |
| |
| validate_readnow_readnever (flags); |
| |
| /* Set SYMFILE_DEFER_BP_RESET because the proper displacement for a PIE |
| (Position Independent Executable) main symbol file will only be |
| computed by the solib_create_inferior_hook below. Without it, |
| breakpoint_re_set would fail to insert the breakpoints with the zero |
| displacement. */ |
| add_flags |= SYMFILE_DEFER_BP_RESET; |
| |
| symbol_file_add_main_1 (name, add_flags, flags, offset); |
| |
| solib_create_inferior_hook (from_tty); |
| |
| /* Now it's safe to re-add the breakpoints. */ |
| breakpoint_re_set (); |
| |
| /* Also, it's safe to re-add varobjs. */ |
| varobj_re_set (); |
| } |
| } |
| |
| /* Lazily set the initial language. */ |
| |
| static void |
| set_initial_language_callback () |
| { |
| enum language lang = main_language (); |
| /* Make C the default language. */ |
| enum language default_lang = language_c; |
| |
| if (lang == language_unknown) |
| { |
| const char *name = main_name (); |
| struct symbol *sym |
| = lookup_symbol_in_language (name, nullptr, SEARCH_FUNCTION_DOMAIN, |
| default_lang, nullptr).symbol; |
| |
| if (sym != NULL) |
| lang = sym->language (); |
| } |
| |
| if (lang == language_unknown) |
| { |
| lang = default_lang; |
| } |
| |
| set_language (lang); |
| expected_language = current_language; /* Don't warn the user. */ |
| } |
| |
| /* Set the initial language. */ |
| |
| void |
| set_initial_language (void) |
| { |
| if (language_mode == language_mode_manual) |
| return; |
| lazily_set_language (set_initial_language_callback); |
| } |
| |
| /* Open the file specified by NAME and hand it off to BFD for |
| preliminary analysis. Return a newly initialized bfd *, which |
| includes a newly malloc'd` copy of NAME (tilde-expanded and made |
| absolute). In case of trouble, error() is called. */ |
| |
| gdb_bfd_ref_ptr |
| symfile_bfd_open (const char *name) |
| { |
| int desc = -1; |
| |
| gdb::unique_xmalloc_ptr<char> absolute_name; |
| if (!is_target_filename (name)) |
| { |
| gdb::unique_xmalloc_ptr<char> expanded_name (tilde_expand (name)); |
| |
| /* Look down path for it, allocate 2nd new malloc'd copy. */ |
| desc = openp (getenv ("PATH"), |
| OPF_TRY_CWD_FIRST | OPF_RETURN_REALPATH, |
| expanded_name.get (), O_RDONLY | O_BINARY, &absolute_name); |
| #if defined(__GO32__) || defined(_WIN32) || defined (__CYGWIN__) |
| if (desc < 0) |
| { |
| char *exename = (char *) alloca (strlen (expanded_name.get ()) + 5); |
| |
| strcat (strcpy (exename, expanded_name.get ()), ".exe"); |
| desc = openp (getenv ("PATH"), |
| OPF_TRY_CWD_FIRST | OPF_RETURN_REALPATH, |
| exename, O_RDONLY | O_BINARY, &absolute_name); |
| } |
| #endif |
| if (desc < 0) |
| perror_with_name (expanded_name.get ()); |
| |
| name = absolute_name.get (); |
| } |
| |
| gdb_bfd_ref_ptr sym_bfd (gdb_bfd_open (name, gnutarget, desc)); |
| if (sym_bfd == NULL) |
| error (_("`%s': can't open to read symbols: %s."), name, |
| bfd_errmsg (bfd_get_error ())); |
| |
| if (!bfd_check_format (sym_bfd.get (), bfd_object)) |
| error (_("`%s': can't read symbols: %s."), name, |
| bfd_errmsg (bfd_get_error ())); |
| |
| return sym_bfd; |
| } |
| |
| /* See symfile.h. */ |
| |
| gdb_bfd_ref_ptr |
| symfile_bfd_open_no_error (const char *name) noexcept |
| { |
| try |
| { |
| return symfile_bfd_open (name); |
| } |
| catch (const gdb_exception_error &err) |
| { |
| warning ("%s", err.what ()); |
| } |
| |
| return nullptr; |
| } |
| |
| /* Return the section index for SECTION_NAME on OBJFILE. Return -1 if |
| the section was not found. */ |
| |
| int |
| get_section_index (struct objfile *objfile, const char *section_name) |
| { |
| asection *sect = bfd_get_section_by_name (objfile->obfd.get (), section_name); |
| |
| if (sect) |
| return sect->index; |
| else |
| return -1; |
| } |
| |
| /* Link SF into the global symtab_fns list. |
| FLAVOUR is the file format that SF handles. |
| Called on startup by the _initialize routine in each object file format |
| reader, to register information about each format the reader is prepared |
| to handle. */ |
| |
| void |
| add_symtab_fns (enum bfd_flavour flavour, const struct sym_fns *sf) |
| { |
| symtab_fns.emplace_back (flavour, sf); |
| } |
| |
| /* Initialize OBJFILE to read symbols from its associated BFD. It |
| either returns or calls error(). The result is an initialized |
| struct sym_fns in the objfile structure, that contains cached |
| information about the symbol file. */ |
| |
| static const struct sym_fns * |
| find_sym_fns (bfd *abfd) |
| { |
| enum bfd_flavour our_flavour = bfd_get_flavour (abfd); |
| |
| if (our_flavour == bfd_target_srec_flavour |
| || our_flavour == bfd_target_ihex_flavour |
| || our_flavour == bfd_target_tekhex_flavour) |
| return NULL; /* No symbols. */ |
| |
| for (const registered_sym_fns &rsf : symtab_fns) |
| if (our_flavour == rsf.sym_flavour) |
| return rsf.sym_fns; |
| |
| error (_("I'm sorry, Dave, I can't do that. Symbol format `%s' unknown."), |
| bfd_get_target (abfd)); |
| } |
| |
| |
| /* This function runs the load command of our current target. */ |
| |
| static void |
| load_command (const char *arg, int from_tty) |
| { |
| dont_repeat (); |
| |
| /* The user might be reloading because the binary has changed. Take |
| this opportunity to check. */ |
| reopen_exec_file (); |
| reread_symbols (from_tty); |
| |
| std::string temp; |
| if (arg == NULL) |
| { |
| const char *parg, *prev; |
| |
| arg = current_program_space->exec_filename (); |
| if (arg == nullptr) |
| no_executable_specified_error (); |
| |
| /* We may need to quote this string so buildargv can pull it |
| apart. */ |
| prev = parg = arg; |
| while ((parg = strpbrk (parg, "\\\"'\t "))) |
| { |
| temp.append (prev, parg - prev); |
| prev = parg++; |
| temp.push_back ('\\'); |
| } |
| /* If we have not copied anything yet, then we didn't see a |
| character to quote, and we can just leave ARG unchanged. */ |
| if (!temp.empty ()) |
| { |
| temp.append (prev); |
| arg = temp.c_str (); |
| } |
| } |
| |
| target_load (arg, from_tty); |
| |
| /* After re-loading the executable, we don't really know which |
| overlays are mapped any more. */ |
| overlay_cache_invalid = 1; |
| } |
| |
| /* This version of "load" should be usable for any target. Currently |
| it is just used for remote targets, not inftarg.c or core files, |
| on the theory that only in that case is it useful. |
| |
| Avoiding xmodem and the like seems like a win (a) because we don't have |
| to worry about finding it, and (b) On VMS, fork() is very slow and so |
| we don't want to run a subprocess. On the other hand, I'm not sure how |
| performance compares. */ |
| |
| static int validate_download = 0; |
| |
| /* Opaque data for load_progress. */ |
| struct load_progress_data |
| { |
| /* Cumulative data. */ |
| unsigned long write_count = 0; |
| unsigned long data_count = 0; |
| bfd_size_type total_size = 0; |
| }; |
| |
| /* Opaque data for load_progress for a single section. */ |
| struct load_progress_section_data |
| { |
| load_progress_section_data (load_progress_data *cumulative_, |
| const char *section_name_, ULONGEST section_size_, |
| CORE_ADDR lma_, gdb_byte *buffer_) |
| : cumulative (cumulative_), section_name (section_name_), |
| section_size (section_size_), lma (lma_), buffer (buffer_) |
| {} |
| |
| struct load_progress_data *cumulative; |
| |
| /* Per-section data. */ |
| const char *section_name; |
| ULONGEST section_sent = 0; |
| ULONGEST section_size; |
| CORE_ADDR lma; |
| gdb_byte *buffer; |
| }; |
| |
| /* Opaque data for load_section_callback. */ |
| struct load_section_data |
| { |
| load_section_data (load_progress_data *progress_data_) |
| : progress_data (progress_data_) |
| {} |
| |
| ~load_section_data () |
| { |
| for (auto &&request : requests) |
| { |
| xfree (request.data); |
| delete ((load_progress_section_data *) request.baton); |
| } |
| } |
| |
| CORE_ADDR load_offset = 0; |
| struct load_progress_data *progress_data; |
| std::vector<struct memory_write_request> requests; |
| }; |
| |
| /* Target write callback routine for progress reporting. */ |
| |
| static void |
| load_progress (ULONGEST bytes, void *untyped_arg) |
| { |
| struct load_progress_section_data *args |
| = (struct load_progress_section_data *) untyped_arg; |
| struct load_progress_data *totals; |
| |
| if (args == NULL) |
| /* Writing padding data. No easy way to get at the cumulative |
| stats, so just ignore this. */ |
| return; |
| |
| totals = args->cumulative; |
| |
| if (bytes == 0 && args->section_sent == 0) |
| { |
| /* The write is just starting. Let the user know we've started |
| this section. */ |
| current_uiout->message ("Loading section %s, size %s lma %s\n", |
| args->section_name, |
| hex_string (args->section_size), |
| paddress (current_inferior ()->arch (), |
| args->lma)); |
| return; |
| } |
| |
| if (validate_download) |
| { |
| /* Broken memories and broken monitors manifest themselves here |
| when bring new computers to life. This doubles already slow |
| downloads. */ |
| /* NOTE: cagney/1999-10-18: A more efficient implementation |
| might add a verify_memory() method to the target vector and |
| then use that. remote.c could implement that method using |
| the ``qCRC'' packet. */ |
| gdb::byte_vector check (bytes); |
| |
| if (target_read_memory (args->lma, check.data (), bytes) != 0) |
| error (_("Download verify read failed at %s"), |
| paddress (current_inferior ()->arch (), args->lma)); |
| if (memcmp (args->buffer, check.data (), bytes) != 0) |
| error (_("Download verify compare failed at %s"), |
| paddress (current_inferior ()->arch (), args->lma)); |
| } |
| totals->data_count += bytes; |
| args->lma += bytes; |
| args->buffer += bytes; |
| totals->write_count += 1; |
| args->section_sent += bytes; |
| if (check_quit_flag () |
| || (deprecated_ui_load_progress_hook != NULL |
| && deprecated_ui_load_progress_hook (args->section_name, |
| args->section_sent))) |
| error (_("Canceled the download")); |
| |
| if (deprecated_show_load_progress != NULL) |
| deprecated_show_load_progress (args->section_name, |
| args->section_sent, |
| args->section_size, |
| totals->data_count, |
| totals->total_size); |
| } |
| |
| /* Service function for generic_load. */ |
| |
| static void |
| load_one_section (bfd *abfd, asection *asec, |
| struct load_section_data *args) |
| { |
| bfd_size_type size = bfd_section_size (asec); |
| const char *sect_name = bfd_section_name (asec); |
| |
| if ((bfd_section_flags (asec) & SEC_LOAD) == 0) |
| return; |
| |
| if (size == 0) |
| return; |
| |
| ULONGEST begin = bfd_section_lma (asec) + args->load_offset; |
| ULONGEST end = begin + size; |
| gdb_byte *buffer = (gdb_byte *) xmalloc (size); |
| bfd_get_section_contents (abfd, asec, buffer, 0, size); |
| |
| load_progress_section_data *section_data |
| = new load_progress_section_data (args->progress_data, sect_name, size, |
| begin, buffer); |
| |
| args->requests.emplace_back (begin, end, buffer, section_data); |
| } |
| |
| static void print_transfer_performance (struct ui_file *stream, |
| unsigned long data_count, |
| unsigned long write_count, |
| std::chrono::steady_clock::duration d); |
| |
| /* See symfile.h. */ |
| |
| void |
| generic_load (const char *args, int from_tty) |
| { |
| struct load_progress_data total_progress; |
| struct load_section_data cbdata (&total_progress); |
| struct ui_out *uiout = current_uiout; |
| |
| if (args == NULL) |
| error_no_arg (_("file to load")); |
| |
| gdb_argv argv (args); |
| |
| gdb::unique_xmalloc_ptr<char> filename (tilde_expand (argv[0])); |
| |
| if (argv[1] != NULL) |
| { |
| const char *endptr; |
| |
| cbdata.load_offset = strtoulst (argv[1], &endptr, 0); |
| |
| /* If the last word was not a valid number then |
| treat it as a file name with spaces in. */ |
| if (argv[1] == endptr) |
| error (_("Invalid download offset:%s."), argv[1]); |
| |
| if (argv[2] != NULL) |
| error (_("Too many parameters.")); |
| } |
| |
| /* Open the file for loading. */ |
| gdb_bfd_ref_ptr loadfile_bfd (gdb_bfd_open (filename.get (), gnutarget)); |
| if (loadfile_bfd == NULL) |
| perror_with_name (filename.get ()); |
| |
| if (!bfd_check_format (loadfile_bfd.get (), bfd_object)) |
| { |
| error (_("\"%s\" is not an object file: %s"), filename.get (), |
| bfd_errmsg (bfd_get_error ())); |
| } |
| |
| for (asection *asec : gdb_bfd_sections (loadfile_bfd)) |
| total_progress.total_size += bfd_section_size (asec); |
| |
| for (asection *asec : gdb_bfd_sections (loadfile_bfd)) |
| load_one_section (loadfile_bfd.get (), asec, &cbdata); |
| |
| using namespace std::chrono; |
| |
| steady_clock::time_point start_time = steady_clock::now (); |
| |
| if (target_write_memory_blocks (cbdata.requests, flash_discard, |
| load_progress) != 0) |
| error (_("Load failed")); |
| |
| steady_clock::time_point end_time = steady_clock::now (); |
| |
| CORE_ADDR entry = bfd_get_start_address (loadfile_bfd.get ()); |
| entry = gdbarch_addr_bits_remove (current_inferior ()->arch (), entry); |
| uiout->text ("Start address "); |
| uiout->field_core_addr ("address", current_inferior ()->arch (), entry); |
| uiout->text (", load size "); |
| uiout->field_unsigned ("load-size", total_progress.data_count); |
| uiout->text ("\n"); |
| regcache_write_pc (get_thread_regcache (inferior_thread ()), entry); |
| |
| /* Reset breakpoints, now that we have changed the load image. For |
| instance, breakpoints may have been set (or reset, by |
| post_create_inferior) while connected to the target but before we |
| loaded the program. In that case, the prologue analyzer could |
| have read instructions from the target to find the right |
| breakpoint locations. Loading has changed the contents of that |
| memory. */ |
| |
| breakpoint_re_set (); |
| |
| print_transfer_performance (gdb_stdout, total_progress.data_count, |
| total_progress.write_count, |
| end_time - start_time); |
| } |
| |
| /* Report on STREAM the performance of a memory transfer operation, |
| such as 'load'. DATA_COUNT is the number of bytes transferred. |
| WRITE_COUNT is the number of separate write operations, or 0, if |
| that information is not available. TIME is how long the operation |
| lasted. */ |
| |
| static void |
| print_transfer_performance (struct ui_file *stream, |
| unsigned long data_count, |
| unsigned long write_count, |
| std::chrono::steady_clock::duration time) |
| { |
| using namespace std::chrono; |
| struct ui_out *uiout = current_uiout; |
| |
| milliseconds ms = duration_cast<milliseconds> (time); |
| |
| uiout->text ("Transfer rate: "); |
| if (ms.count () > 0) |
| { |
| unsigned long rate = ((ULONGEST) data_count * 1000) / ms.count (); |
| |
| if (uiout->is_mi_like_p ()) |
| { |
| uiout->field_unsigned ("transfer-rate", rate * 8); |
| uiout->text (" bits/sec"); |
| } |
| else if (rate < 1024) |
| { |
| uiout->field_unsigned ("transfer-rate", rate); |
| uiout->text (" bytes/sec"); |
| } |
| else |
| { |
| uiout->field_unsigned ("transfer-rate", rate / 1024); |
| uiout->text (" KB/sec"); |
| } |
| } |
| else |
| { |
| uiout->field_unsigned ("transferred-bits", (data_count * 8)); |
| uiout->text (" bits in <1 sec"); |
| } |
| if (write_count > 0) |
| { |
| uiout->text (", "); |
| uiout->field_unsigned ("write-rate", data_count / write_count); |
| uiout->text (" bytes/write"); |
| } |
| uiout->text (".\n"); |
| } |
| |
| /* Add an OFFSET to the start address of each section in OBJF, except |
| sections that were specified in ADDRS. */ |
| |
| static void |
| set_objfile_default_section_offset (struct objfile *objf, |
| const section_addr_info &addrs, |
| CORE_ADDR offset) |
| { |
| /* Add OFFSET to all sections by default. */ |
| section_offsets offsets (objf->section_offsets.size (), offset); |
| |
| /* Create sorted lists of all sections in ADDRS as well as all |
| sections in OBJF. */ |
| |
| std::vector<const struct other_sections *> addrs_sorted |
| = addrs_section_sort (addrs); |
| |
| section_addr_info objf_addrs |
| = build_section_addr_info_from_objfile (objf); |
| std::vector<const struct other_sections *> objf_addrs_sorted |
| = addrs_section_sort (objf_addrs); |
| |
| /* Walk the BFD section list, and if a matching section is found in |
| ADDRS_SORTED_LIST, set its offset to zero to keep its address |
| unchanged. |
| |
| Note that both lists may contain multiple sections with the same |
| name, and then the sections from ADDRS are matched in BFD order |
| (thanks to sectindex). */ |
| |
| std::vector<const struct other_sections *>::iterator addrs_sorted_iter |
| = addrs_sorted.begin (); |
| for (const other_sections *objf_sect : objf_addrs_sorted) |
| { |
| const char *objf_name = addr_section_name (objf_sect->name.c_str ()); |
| int cmp = -1; |
| |
| while (cmp < 0 && addrs_sorted_iter != addrs_sorted.end ()) |
| { |
| const struct other_sections *sect = *addrs_sorted_iter; |
| const char *sect_name = addr_section_name (sect->name.c_str ()); |
| cmp = strcmp (sect_name, objf_name); |
| if (cmp <= 0) |
| ++addrs_sorted_iter; |
| } |
| |
| if (cmp == 0) |
| offsets[objf_sect->sectindex] = 0; |
| } |
| |
| /* Apply the new section offsets. */ |
| objfile_relocate (objf, offsets); |
| } |
| |
| /* This function allows the addition of incrementally linked object files. |
| It does not modify any state in the target, only in the debugger. */ |
| |
| static void |
| add_symbol_file_command (const char *args, int from_tty) |
| { |
| struct gdbarch *gdbarch = get_current_arch (); |
| gdb::unique_xmalloc_ptr<char> filename; |
| char *arg; |
| int argcnt = 0; |
| struct objfile *objf; |
| objfile_flags flags = OBJF_USERLOADED | OBJF_SHARED; |
| symfile_add_flags add_flags = 0; |
| |
| if (from_tty) |
| add_flags |= SYMFILE_VERBOSE; |
| |
| struct sect_opt |
| { |
| const char *name; |
| const char *value; |
| }; |
| |
| std::vector<sect_opt> sect_opts = { { ".text", NULL } }; |
| bool stop_processing_options = false; |
| CORE_ADDR offset = 0; |
| |
| dont_repeat (); |
| |
| if (args == NULL) |
| error (_("add-symbol-file takes a file name and an address")); |
| |
| bool seen_addr = false; |
| bool seen_offset = false; |
| gdb_argv argv (args); |
| |
| for (arg = argv[0], argcnt = 0; arg != NULL; arg = argv[++argcnt]) |
| { |
| if (stop_processing_options || *arg != '-') |
| { |
| if (filename == NULL) |
| { |
| /* First non-option argument is always the filename. */ |
| filename.reset (tilde_expand (arg)); |
| } |
| else if (!seen_addr) |
| { |
| /* The second non-option argument is always the text |
| address at which to load the program. */ |
| sect_opts[0].value = arg; |
| seen_addr = true; |
| } |
| else |
| error (_("Unrecognized argument \"%s\""), arg); |
| } |
| else if (strcmp (arg, "-readnow") == 0) |
| flags |= OBJF_READNOW; |
| else if (strcmp (arg, "-readnever") == 0) |
| flags |= OBJF_READNEVER; |
| else if (strcmp (arg, "-s") == 0) |
| { |
| if (argv[argcnt + 1] == NULL) |
| error (_("Missing section name after \"-s\"")); |
| else if (argv[argcnt + 2] == NULL) |
| error (_("Missing section address after \"-s\"")); |
| |
| sect_opt sect = { argv[argcnt + 1], argv[argcnt + 2] }; |
| |
| sect_opts.push_back (sect); |
| argcnt += 2; |
| } |
| else if (strcmp (arg, "-o") == 0) |
| { |
| arg = argv[++argcnt]; |
| if (arg == NULL) |
| error (_("Missing argument to -o")); |
| |
| offset = parse_and_eval_address (arg); |
| seen_offset = true; |
| } |
| else if (strcmp (arg, "--") == 0) |
| stop_processing_options = true; |
| else |
| error (_("Unrecognized argument \"%s\""), arg); |
| } |
| |
| if (filename == NULL) |
| error (_("You must provide a filename to be loaded.")); |
| |
| validate_readnow_readnever (flags); |
| |
| /* Print the prompt for the query below. And save the arguments into |
| a sect_addr_info structure to be passed around to other |
| functions. We have to split this up into separate print |
| statements because hex_string returns a local static |
| string. */ |
| |
| gdb_printf (_("add symbol table from file \"%ps\""), |
| styled_string (file_name_style.style (), filename.get ())); |
| section_addr_info section_addrs; |
| std::vector<sect_opt>::const_iterator it = sect_opts.begin (); |
| if (!seen_addr) |
| ++it; |
| for (; it != sect_opts.end (); ++it) |
| { |
| CORE_ADDR addr; |
| const char *val = it->value; |
| const char *sec = it->name; |
| |
| if (section_addrs.empty ()) |
| gdb_printf (_(" at\n")); |
| addr = parse_and_eval_address (val); |
| |
| /* Here we store the section offsets in the order they were |
| entered on the command line. Every array element is |
| assigned an ascending section index to preserve the above |
| order over an unstable sorting algorithm. This dummy |
| index is not used for any other purpose. |
| */ |
| section_addrs.emplace_back (addr, sec, section_addrs.size ()); |
| gdb_printf ("\t%s_addr = %s\n", sec, |
| paddress (gdbarch, addr)); |
| |
| /* The object's sections are initialized when a |
| call is made to build_objfile_section_table (objfile). |
| This happens in reread_symbols. |
| At this point, we don't know what file type this is, |
| so we can't determine what section names are valid. */ |
| } |
| if (seen_offset) |
| gdb_printf (_("%s offset by %s\n"), |
| (section_addrs.empty () |
| ? _(" with all sections") |
| : _("with other sections")), |
| paddress (gdbarch, offset)); |
| else if (section_addrs.empty ()) |
| gdb_printf ("\n"); |
| |
| if (from_tty && (!query ("%s", ""))) |
| error (_("Not confirmed.")); |
| |
| objf = symbol_file_add (filename.get (), add_flags, §ion_addrs, |
| flags); |
| if (!objfile_has_symbols (objf) && objf->per_bfd->minimal_symbol_count <= 0) |
| warning (_("newly-added symbol file \"%ps\" does not provide any symbols"), |
| styled_string (file_name_style.style (), filename.get ())); |
| |
| if (seen_offset) |
| set_objfile_default_section_offset (objf, section_addrs, offset); |
| |
| current_program_space->add_target_sections (objf); |
| |
| /* Getting new symbols may change our opinion about what is |
| frameless. */ |
| reinit_frame_cache (); |
| } |
| |
| |
| /* This function removes a symbol file that was added via add-symbol-file. */ |
| |
| static void |
| remove_symbol_file_command (const char *args, int from_tty) |
| { |
| struct objfile *objf = NULL; |
| struct program_space *pspace = current_program_space; |
| |
| dont_repeat (); |
| |
| if (args == NULL) |
| error (_("remove-symbol-file: no symbol file provided")); |
| |
| gdb_argv argv (args); |
| |
| if (strcmp (argv[0], "-a") == 0) |
| { |
| /* Interpret the next argument as an address. */ |
| CORE_ADDR addr; |
| |
| if (argv[1] == NULL) |
| error (_("Missing address argument")); |
| |
| if (argv[2] != NULL) |
| error (_("Junk after %s"), argv[1]); |
| |
| addr = parse_and_eval_address (argv[1]); |
| |
| for (objfile *objfile : current_program_space->objfiles ()) |
| { |
| if ((objfile->flags & OBJF_USERLOADED) != 0 |
| && (objfile->flags & OBJF_SHARED) != 0 |
| && objfile->pspace () == pspace |
| && is_addr_in_objfile (addr, objfile)) |
| { |
| objf = objfile; |
| break; |
| } |
| } |
| } |
| else if (argv[0] != NULL) |
| { |
| /* Interpret the current argument as a file name. */ |
| |
| if (argv[1] != NULL) |
| error (_("Junk after %s"), argv[0]); |
| |
| gdb::unique_xmalloc_ptr<char> filename (tilde_expand (argv[0])); |
| |
| for (objfile *objfile : current_program_space->objfiles ()) |
| { |
| if ((objfile->flags & OBJF_USERLOADED) != 0 |
| && (objfile->flags & OBJF_SHARED) != 0 |
| && objfile->pspace () == pspace |
| && filename_cmp (filename.get (), objfile_name (objfile)) == 0) |
| { |
| objf = objfile; |
| break; |
| } |
| } |
| } |
| |
| if (objf == NULL) |
| error (_("No symbol file found")); |
| |
| if (from_tty |
| && !query (_("Remove symbol table from file \"%s\"? "), |
| objfile_name (objf))) |
| error (_("Not confirmed.")); |
| |
| objf->unlink (); |
| clear_symtab_users (0); |
| } |
| |
| /* Re-read symbols if a symbol-file has changed. */ |
| |
| void |
| reread_symbols (int from_tty) |
| { |
| std::vector<struct objfile *> new_objfiles; |
| |
| /* Check to see if the executable has changed, and if so reopen it. The |
| executable might not be in the list of objfiles (if the user set |
| different values for 'exec-file' and 'symbol-file'), and even if it |
| is, then we use a separate timestamp (within the program_space) to |
| indicate when the executable was last reloaded. */ |
| reopen_exec_file (); |
| |
| for (objfile *objfile : current_program_space->objfiles ()) |
| { |
| if (objfile->obfd.get () == NULL) |
| continue; |
| |
| /* Separate debug objfiles are handled in the main objfile. */ |
| if (objfile->separate_debug_objfile_backlink) |
| continue; |
| |
| /* When a in-memory BFD is initially created, it's mtime (as |
| returned by bfd_get_mtime) is the creation time of the BFD. |
| However, we call bfd_stat here as we want to see if the |
| underlying file has changed, and in this case an in-memory BFD |
| will return an st_mtime of zero, so it appears that the in-memory |
| file has changed, which isn't what we want here -- this code is |
| about reloading BFDs that changed on disk. |
| |
| Just skip any in-memory BFD. */ |
| if (objfile->obfd.get ()->flags & BFD_IN_MEMORY) |
| continue; |
| |
| struct stat new_statbuf; |
| int res = bfd_stat (objfile->obfd.get (), &new_statbuf); |
| if (res != 0) |
| { |
| /* If this object is from an archive (what you usually create |
| with `ar', often called a `static library' on most systems, |
| though a `shared library' on AIX is also an archive), then you |
| should stat on the archive name, not member name. */ |
| const char *filename; |
| if (objfile->obfd->my_archive) |
| filename = bfd_get_filename (objfile->obfd->my_archive); |
| else |
| filename = objfile_name (objfile); |
| |
| warning (_("`%ps' has disappeared; keeping its symbols."), |
| styled_string (file_name_style.style (), filename)); |
| continue; |
| } |
| time_t new_modtime = new_statbuf.st_mtime; |
| if (new_modtime != objfile->mtime) |
| { |
| gdb_printf (_("`%ps' has changed; re-reading symbols.\n"), |
| styled_string (file_name_style.style (), |
| objfile_name (objfile))); |
| |
| /* There are various functions like symbol_file_add, |
| symfile_bfd_open, syms_from_objfile, etc., which might |
| appear to do what we want. But they have various other |
| effects which we *don't* want. So we just do stuff |
| ourselves. We don't worry about mapped files (for one thing, |
| any mapped file will be out of date). */ |
| |
| /* If we get an error, blow away this objfile (not sure if |
| that is the correct response for things like shared |
| libraries). */ |
| objfile_up objfile_holder (objfile); |
| |
| /* We need to do this whenever any symbols go away. */ |
| clear_symtab_users_cleanup defer_clear_users (0); |
| |
| /* Keep the calls order approx. the same as in free_objfile. */ |
| |
| /* Free the separate debug objfiles. It will be |
| automatically recreated by sym_read. */ |
| free_objfile_separate_debug (objfile); |
| |
| /* Clear the stale source cache. */ |
| forget_cached_source_info (); |
| |
| /* Remove any references to this objfile in the global |
| value lists. */ |
| preserve_values (objfile); |
| |
| /* Nuke all the state that we will re-read. Much of the following |
| code which sets things to NULL really is necessary to tell |
| other parts of GDB that there is nothing currently there. |
| |
| Try to keep the freeing order compatible with free_objfile. */ |
| |
| if (objfile->sf != NULL) |
| { |
| (*objfile->sf->sym_finish) (objfile); |
| } |
| |
| objfile->registry_fields.clear_registry (); |
| |
| /* Clean up any state BFD has sitting around. */ |
| { |
| gdb_bfd_ref_ptr obfd = objfile->obfd; |
| const char *obfd_filename; |
| |
| obfd_filename = bfd_get_filename (objfile->obfd.get ()); |
| /* Open the new BFD before freeing the old one, so that |
| the filename remains live. */ |
| gdb_bfd_ref_ptr temp (gdb_bfd_open (obfd_filename, gnutarget)); |
| objfile->obfd = std::move (temp); |
| if (objfile->obfd == NULL) |
| error (_("Can't open %s to read symbols."), obfd_filename); |
| } |
| |
| std::string original_name = objfile->original_name; |
| |
| /* bfd_openr sets cacheable to true, which is what we want. */ |
| if (!bfd_check_format (objfile->obfd.get (), bfd_object)) |
| error (_("Can't read symbols from %s: %s."), objfile_name (objfile), |
| bfd_errmsg (bfd_get_error ())); |
| |
| /* NB: after this call to obstack_free, objfiles_changed |
| will need to be called (see discussion below). */ |
| obstack_free (&objfile->objfile_obstack, 0); |
| objfile->sections_start = NULL; |
| objfile->section_offsets.clear (); |
| objfile->sect_index_bss = -1; |
| objfile->sect_index_data = -1; |
| objfile->sect_index_rodata = -1; |
| objfile->sect_index_text = -1; |
| objfile->compunit_symtabs = NULL; |
| objfile->template_symbols = NULL; |
| objfile->static_links.reset (nullptr); |
| |
| /* obstack_init also initializes the obstack so it is |
| empty. We could use obstack_specify_allocation but |
| gdb_obstack.h specifies the alloc/dealloc functions. */ |
| obstack_init (&objfile->objfile_obstack); |
| |
| /* set_objfile_per_bfd potentially allocates the per-bfd |
| data on the objfile's obstack (if sharing data across |
| multiple users is not possible), so it's important to |
| do it *after* the obstack has been initialized. */ |
| set_objfile_per_bfd (objfile); |
| |
| objfile->original_name |
| = obstack_strdup (&objfile->objfile_obstack, original_name); |
| |
| /* Reset the sym_fns pointer. The ELF reader can change it |
| based on whether .gdb_index is present, and we need it to |
| start over. PR symtab/15885 */ |
| objfile_set_sym_fns (objfile, find_sym_fns (objfile->obfd.get ())); |
| objfile->qf.clear (); |
| |
| build_objfile_section_table (objfile); |
| |
| /* What the hell is sym_new_init for, anyway? The concept of |
| distinguishing between the main file and additional files |
| in this way seems rather dubious. */ |
| if (objfile == current_program_space->symfile_object_file) |
| { |
| (*objfile->sf->sym_new_init) (objfile); |
| } |
| |
| (*objfile->sf->sym_init) (objfile); |
| clear_complaints (); |
| |
| /* We are about to read new symbols and potentially also |
| DWARF information. Some targets may want to pass addresses |
| read from DWARF DIE's through an adjustment function before |
| saving them, like MIPS, which may call into |
| "find_pc_section". When called, that function will make |
| use of per-objfile program space data. |
| |
| Since we discarded our section information above, we have |
| dangling pointers in the per-objfile program space data |
| structure. Force GDB to update the section mapping |
| information by letting it know the objfile has changed, |
| making the dangling pointers point to correct data |
| again. */ |
| |
| objfiles_changed (current_program_space); |
| |
| /* Recompute section offsets and section indices. */ |
| objfile->sf->sym_offsets (objfile, {}); |
| |
| read_symbols (objfile, 0); |
| |
| if ((objfile->flags & OBJF_READNOW)) |
| { |
| const int mainline = objfile->flags & OBJF_MAINLINE; |
| const int should_print = (print_symbol_loading_p (from_tty, mainline, 1) |
| && readnow_symbol_files); |
| if (should_print) |
| gdb_printf (_("Expanding full symbols from %ps...\n"), |
| styled_string (file_name_style.style (), |
| objfile_name (objfile))); |
| |
| objfile->expand_all_symtabs (); |
| } |
| |
| if (!objfile_has_symbols (objfile)) |
| { |
| gdb_stdout->wrap_here (0); |
| gdb_printf (_("(no debugging symbols found)\n")); |
| gdb_stdout->wrap_here (0); |
| } |
| |
| /* We're done reading the symbol file; finish off complaints. */ |
| clear_complaints (); |
| |
| /* Getting new symbols may change our opinion about what is |
| frameless. */ |
| |
| reinit_frame_cache (); |
| |
| /* Discard cleanups as symbol reading was successful. */ |
| objfile_holder.release (); |
| defer_clear_users.release (); |
| |
| /* If the mtime has changed between the time we set new_modtime |
| and now, we *want* this to be out of date, so don't call stat |
| again now. */ |
| objfile->mtime = new_modtime; |
| init_entry_point_info (objfile); |
| |
| new_objfiles.push_back (objfile); |
| } |
| } |
| |
| if (!new_objfiles.empty ()) |
| { |
| clear_symtab_users (0); |
| |
| /* The registry for each objfile was cleared and |
| gdb::observers::new_objfile.notify (NULL) has been called by |
| clear_symtab_users above. Notify the new files now. */ |
| for (auto iter : new_objfiles) |
| gdb::observers::new_objfile.notify (iter); |
| } |
| } |
| |
| |
| struct filename_language |
| { |
| filename_language (const std::string &ext_, enum language lang_) |
| : ext (ext_), lang (lang_) |
| {} |
| |
| std::string ext; |
| enum language lang; |
| }; |
| |
| static std::vector<filename_language> filename_language_table; |
| |
| /* See symfile.h. */ |
| |
| void |
| add_filename_language (const char *ext, enum language lang) |
| { |
| gdb_assert (ext != nullptr); |
| filename_language_table.emplace_back (ext, lang); |
| } |
| |
| static std::string ext_args; |
| static void |
| show_ext_args (struct ui_file *file, int from_tty, |
| struct cmd_list_element *c, const char *value) |
| { |
| gdb_printf (file, |
| _("Mapping between filename extension " |
| "and source language is \"%s\".\n"), |
| value); |
| } |
| |
| static void |
| set_ext_lang_command (const char *args, |
| int from_tty, struct cmd_list_element *e) |
| { |
| const char *begin = ext_args.c_str (); |
| const char *end = ext_args.c_str (); |
| |
| /* First arg is filename extension, starting with '.' */ |
| if (*end != '.') |
| error (_("'%s': Filename extension must begin with '.'"), ext_args.c_str ()); |
| |
| /* Find end of first arg. */ |
| while (*end != '\0' && !isspace (*end)) |
| end++; |
| |
| if (*end == '\0') |
| error (_("'%s': two arguments required -- " |
| "filename extension and language"), |
| ext_args.c_str ()); |
| |
| /* Extract first arg, the extension. */ |
| std::string extension = ext_args.substr (0, end - begin); |
| |
| /* Find beginning of second arg, which should be a source language. */ |
| begin = skip_spaces (end); |
| |
| if (*begin == '\0') |
| error (_("'%s': two arguments required -- " |
| "filename extension and language"), |
| ext_args.c_str ()); |
| |
| /* Lookup the language from among those we know. */ |
| language lang = language_enum (begin); |
| |
| auto it = filename_language_table.begin (); |
| /* Now lookup the filename extension: do we already know it? */ |
| for (; it != filename_language_table.end (); it++) |
| { |
| if (it->ext == extension) |
| break; |
| } |
| |
| if (it == filename_language_table.end ()) |
| { |
| /* New file extension. */ |
| add_filename_language (extension.data (), lang); |
| } |
| else |
| { |
| /* Redefining a previously known filename extension. */ |
| |
| /* if (from_tty) */ |
| /* query ("Really make files of type %s '%s'?", */ |
| /* ext_args, language_str (lang)); */ |
| |
| it->lang = lang; |
| } |
| } |
| |
| static void |
| info_ext_lang_command (const char *args, int from_tty) |
| { |
| gdb_printf (_("Filename extensions and the languages they represent:")); |
| gdb_printf ("\n\n"); |
| for (const filename_language &entry : filename_language_table) |
| gdb_printf ("\t%s\t- %s\n", entry.ext.c_str (), |
| language_str (entry.lang)); |
| } |
| |
| enum language |
| deduce_language_from_filename (const char *filename) |
| { |
| const char *cp; |
| |
| if (filename != NULL) |
| if ((cp = strrchr (filename, '.')) != NULL) |
| { |
| for (const filename_language &entry : filename_language_table) |
| if (entry.ext == cp) |
| return entry.lang; |
| } |
| |
| return language_unknown; |
| } |
| |
| /* Allocate and initialize a new symbol table. |
| CUST is from the result of allocate_compunit_symtab. */ |
| |
| struct symtab * |
| allocate_symtab (struct compunit_symtab *cust, const char *filename, |
| const char *filename_for_id) |
| { |
| struct objfile *objfile = cust->objfile (); |
| struct symtab *symtab |
| = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct symtab); |
| |
| symtab->filename = objfile->intern (filename); |
| symtab->filename_for_id = objfile->intern (filename_for_id); |
| symtab->set_language (deduce_language_from_filename (filename)); |
| |
| /* This can be very verbose with lots of headers. |
| Only print at higher debug levels. */ |
| if (symtab_create_debug >= 2) |
| { |
| /* Be a bit clever with debugging messages, and don't print objfile |
| every time, only when it changes. */ |
| static std::string last_objfile_name; |
| const char *this_objfile_name = objfile_name (objfile); |
| |
| if (last_objfile_name.empty () || last_objfile_name != this_objfile_name) |
| { |
| last_objfile_name = this_objfile_name; |
| |
| symtab_create_debug_printf_v |
| ("creating one or more symtabs for objfile %s", this_objfile_name); |
| } |
| |
| symtab_create_debug_printf_v ("created symtab %s for module %s", |
| host_address_to_string (symtab), filename); |
| } |
| |
| /* Add it to CUST's list of symtabs. */ |
| cust->add_filetab (symtab); |
| |
| /* Backlink to the containing compunit symtab. */ |
| symtab->set_compunit (cust); |
| |
| return symtab; |
| } |
| |
| /* Allocate and initialize a new compunit. |
| NAME is the name of the main source file, if there is one, or some |
| descriptive text if there are no source files. */ |
| |
| struct compunit_symtab * |
| allocate_compunit_symtab (struct objfile *objfile, const char *name) |
| { |
| struct compunit_symtab *cu = OBSTACK_ZALLOC (&objfile->objfile_obstack, |
| struct compunit_symtab); |
| const char *saved_name; |
| |
| cu->set_objfile (objfile); |
| |
| /* The name we record here is only for display/debugging purposes. |
| Just save the basename to avoid path issues (too long for display, |
| relative vs absolute, etc.). */ |
| saved_name = lbasename (name); |
| cu->name = obstack_strdup (&objfile->objfile_obstack, saved_name); |
| |
| cu->set_debugformat ("unknown"); |
| |
| symtab_create_debug_printf_v ("created compunit symtab %s for %s", |
| host_address_to_string (cu), |
| cu->name); |
| |
| return cu; |
| } |
| |
| /* Hook CU to the objfile it comes from. */ |
| |
| void |
| add_compunit_symtab_to_objfile (struct compunit_symtab *cu) |
| { |
| cu->next = cu->objfile ()->compunit_symtabs; |
| cu->objfile ()->compunit_symtabs = cu; |
| } |
| |
| |
| /* Reset all data structures in gdb which may contain references to |
| symbol table data. */ |
| |
| void |
| clear_symtab_users (symfile_add_flags add_flags) |
| { |
| /* Someday, we should do better than this, by only blowing away |
| the things that really need to be blown. */ |
| |
| /* Clear the "current" symtab first, because it is no longer valid. |
| breakpoint_re_set may try to access the current symtab. */ |
| clear_current_source_symtab_and_line (current_program_space); |
| |
| clear_displays (); |
| clear_last_displayed_sal (); |
| clear_pc_function_cache (); |
| gdb::observers::all_objfiles_removed.notify (current_program_space); |
| |
| /* Now that the various caches have been cleared, we can re_set |
| our breakpoints without risking it using stale data. */ |
| if ((add_flags & SYMFILE_DEFER_BP_RESET) == 0) |
| breakpoint_re_set (); |
| } |
| |
| /* OVERLAYS: |
| The following code implements an abstraction for debugging overlay sections. |
| |
| The target model is as follows: |
| 1) The gnu linker will permit multiple sections to be mapped into the |
| same VMA, each with its own unique LMA (or load address). |
| 2) It is assumed that some runtime mechanism exists for mapping the |
| sections, one by one, from the load address into the VMA address. |
| 3) This code provides a mechanism for gdb to keep track of which |
| sections should be considered to be mapped from the VMA to the LMA. |
| This information is used for symbol lookup, and memory read/write. |
| For instance, if a section has been mapped then its contents |
| should be read from the VMA, otherwise from the LMA. |
| |
| Two levels of debugger support for overlays are available. One is |
| "manual", in which the debugger relies on the user to tell it which |
| overlays are currently mapped. This level of support is |
| implemented entirely in the core debugger, and the information about |
| whether a section is mapped is kept in the objfile->obj_section table. |
| |
| The second level of support is "automatic", and is only available if |
| the target-specific code provides functionality to read the target's |
| overlay mapping table, and translate its contents for the debugger |
| (by updating the mapped state information in the obj_section tables). |
| |
| The interface is as follows: |
| User commands: |
| overlay map <name> -- tell gdb to consider this section mapped |
| overlay unmap <name> -- tell gdb to consider this section unmapped |
| overlay list -- list the sections that GDB thinks are mapped |
| overlay read-target -- get the target's state of what's mapped |
| overlay off/manual/auto -- set overlay debugging state |
| Functional interface: |
| find_pc_mapped_section(pc): if the pc is in the range of a mapped |
| section, return that section. |
| find_pc_overlay(pc): find any overlay section that contains |
| the pc, either in its VMA or its LMA |
| section_is_mapped(sect): true if overlay is marked as mapped |
| section_is_overlay(sect): true if section's VMA != LMA |
| pc_in_mapped_range(pc,sec): true if pc belongs to section's VMA |
| pc_in_unmapped_range(...): true if pc belongs to section's LMA |
| sections_overlap(sec1, sec2): true if mapped sec1 and sec2 ranges overlap |
| overlay_mapped_address(...): map an address from section's LMA to VMA |
| overlay_unmapped_address(...): map an address from section's VMA to LMA |
| symbol_overlayed_address(...): Return a "current" address for symbol: |
| either in VMA or LMA depending on whether |
| the symbol's section is currently mapped. */ |
| |
| /* Overlay debugging state: */ |
| |
| enum overlay_debugging_state overlay_debugging = ovly_off; |
| int overlay_cache_invalid = 0; /* True if need to refresh mapped state. */ |
| |
| /* Function: section_is_overlay (SECTION) |
| Returns true if SECTION has VMA not equal to LMA, ie. |
| SECTION is loaded at an address different from where it will "run". */ |
| |
| int |
| section_is_overlay (struct obj_section *section) |
| { |
| if (overlay_debugging && section) |
| { |
| asection *bfd_section = section->the_bfd_section; |
| |
| if (bfd_section_lma (bfd_section) != 0 |
| && bfd_section_lma (bfd_section) != bfd_section_vma (bfd_section)) |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| /* Invalidate the mapped state of all overlay sections (mark it as stale) in |
| PSPACE. */ |
| |
| static void |
| overlay_invalidate_all (program_space *pspace) |
| { |
| for (objfile *objfile : pspace->objfiles ()) |
| for (obj_section *sect : objfile->sections ()) |
| if (section_is_overlay (sect)) |
| sect->ovly_mapped = -1; |
| } |
| |
| /* Function: section_is_mapped (SECTION) |
| Returns true if section is an overlay, and is currently mapped. |
| |
| Access to the ovly_mapped flag is restricted to this function, so |
| that we can do automatic update. If the global flag |
| OVERLAY_CACHE_INVALID is set (by wait_for_inferior), then call |
| overlay_invalidate_all. If the mapped state of the particular |
| section is stale, then call TARGET_OVERLAY_UPDATE to refresh it. */ |
| |
| int |
| section_is_mapped (struct obj_section *osect) |
| { |
| struct gdbarch *gdbarch; |
| |
| if (osect == 0 || !section_is_overlay (osect)) |
| return 0; |
| |
| switch (overlay_debugging) |
| { |
| default: |
| case ovly_off: |
| return 0; /* overlay debugging off */ |
| case ovly_auto: /* overlay debugging automatic */ |
| /* Unles there is a gdbarch_overlay_update function, |
| there's really nothing useful to do here (can't really go auto). */ |
| gdbarch = osect->objfile->arch (); |
| if (gdbarch_overlay_update_p (gdbarch)) |
| { |
| if (overlay_cache_invalid) |
| { |
| overlay_invalidate_all (current_program_space); |
| overlay_cache_invalid = 0; |
| } |
| if (osect->ovly_mapped == -1) |
| gdbarch_overlay_update (gdbarch, osect); |
| } |
| [[fallthrough]]; |
| case ovly_on: /* overlay debugging manual */ |
| return osect->ovly_mapped == 1; |
| } |
| } |
| |
| /* Function: pc_in_unmapped_range |
| If PC falls into the lma range of SECTION, return true, else false. */ |
| |
| bool |
| pc_in_unmapped_range (CORE_ADDR pc, struct obj_section *section) |
| { |
| if (section_is_overlay (section)) |
| { |
| asection *bfd_section = section->the_bfd_section; |
| |
| /* We assume the LMA is relocated by the same offset as the VMA. */ |
| bfd_vma size = bfd_section_size (bfd_section); |
| CORE_ADDR offset = section->offset (); |
| |
| if (bfd_section_lma (bfd_section) + offset <= pc |
| && pc < bfd_section_lma (bfd_section) + offset + size) |
| return true; |
| } |
| |
| return false; |
| } |
| |
| /* Function: pc_in_mapped_range |
| If PC falls into the vma range of SECTION, return true, else false. */ |
| |
| bool |
| pc_in_mapped_range (CORE_ADDR pc, struct obj_section *section) |
| { |
| if (section_is_overlay (section)) |
| { |
| if (section->contains (pc)) |
| return true; |
| } |
| |
| return false; |
| } |
| |
| /* Return true if the mapped ranges of sections A and B overlap, false |
| otherwise. */ |
| |
| static int |
| sections_overlap (struct obj_section *a, struct obj_section *b) |
| { |
| CORE_ADDR a_start = a->addr (); |
| CORE_ADDR a_end = a->endaddr (); |
| CORE_ADDR b_start = b->addr (); |
| CORE_ADDR b_end = b->endaddr (); |
| |
| return (a_start < b_end && b_start < a_end); |
| } |
| |
| /* Function: overlay_unmapped_address (PC, SECTION) |
| Returns the address corresponding to PC in the unmapped (load) range. |
| May be the same as PC. */ |
| |
| CORE_ADDR |
| overlay_unmapped_address (CORE_ADDR pc, struct obj_section *section) |
| { |
| if (section_is_overlay (section) && pc_in_mapped_range (pc, section)) |
| { |
| asection *bfd_section = section->the_bfd_section; |
| |
| return (pc + bfd_section_lma (bfd_section) |
| - bfd_section_vma (bfd_section)); |
| } |
| |
| return pc; |
| } |
| |
| /* Function: overlay_mapped_address (PC, SECTION) |
| Returns the address corresponding to PC in the mapped (runtime) range. |
| May be the same as PC. */ |
| |
| CORE_ADDR |
| overlay_mapped_address (CORE_ADDR pc, struct obj_section *section) |
| { |
| if (section_is_overlay (section) && pc_in_unmapped_range (pc, section)) |
| { |
| asection *bfd_section = section->the_bfd_section; |
| |
| return (pc + bfd_section_vma (bfd_section) |
| - bfd_section_lma (bfd_section)); |
| } |
| |
| return pc; |
| } |
| |
| /* Function: symbol_overlayed_address |
| Return one of two addresses (relative to the VMA or to the LMA), |
| depending on whether the section is mapped or not. */ |
| |
| CORE_ADDR |
| symbol_overlayed_address (CORE_ADDR address, struct obj_section *section) |
| { |
| if (overlay_debugging) |
| { |
| /* If the symbol has no section, just return its regular address. */ |
| if (section == 0) |
| return address; |
| /* If the symbol's section is not an overlay, just return its |
| address. */ |
| if (!section_is_overlay (section)) |
| return address; |
| /* If the symbol's section is mapped, just return its address. */ |
| if (section_is_mapped (section)) |
| return address; |
| /* |
| * HOWEVER: if the symbol is in an overlay section which is NOT mapped, |
| * then return its LOADED address rather than its vma address!! |
| */ |
| return overlay_unmapped_address (address, section); |
| } |
| return address; |
| } |
| |
| /* Function: find_pc_overlay (PC) |
| Return the best-match overlay section for PC: |
| If PC matches a mapped overlay section's VMA, return that section. |
| Else if PC matches an unmapped section's VMA, return that section. |
| Else if PC matches an unmapped section's LMA, return that section. */ |
| |
| struct obj_section * |
| find_pc_overlay (CORE_ADDR pc) |
| { |
| struct obj_section *best_match = NULL; |
| |
| if (overlay_debugging) |
| { |
| for (objfile *objfile : current_program_space->objfiles ()) |
| for (obj_section *osect : objfile->sections ()) |
| if (section_is_overlay (osect)) |
| { |
| if (pc_in_mapped_range (pc, osect)) |
| { |
| if (section_is_mapped (osect)) |
| return osect; |
| else |
| best_match = osect; |
| } |
| else if (pc_in_unmapped_range (pc, osect)) |
| best_match = osect; |
| } |
| } |
| return best_match; |
| } |
| |
| /* Function: find_pc_mapped_section (PC) |
| If PC falls into the VMA address range of an overlay section that is |
| currently marked as MAPPED, return that section. Else return NULL. */ |
| |
| struct obj_section * |
| find_pc_mapped_section (CORE_ADDR pc) |
| { |
| if (overlay_debugging) |
| { |
| for (objfile *objfile : current_program_space->objfiles ()) |
| for (obj_section *osect : objfile->sections ()) |
| if (pc_in_mapped_range (pc, osect) && section_is_mapped (osect)) |
| return osect; |
| } |
| |
| return NULL; |
| } |
| |
| /* Function: list_overlays_command |
| Print a list of mapped sections and their PC ranges. */ |
| |
| static void |
| list_overlays_command (const char *args, int from_tty) |
| { |
| int nmapped = 0; |
| |
| if (overlay_debugging) |
| { |
| for (objfile *objfile : current_program_space->objfiles ()) |
| for (obj_section *osect : objfile->sections ()) |
| if (section_is_mapped (osect)) |
| { |
| struct gdbarch *gdbarch = objfile->arch (); |
| const char *name; |
| bfd_vma lma, vma; |
| int size; |
| |
| vma = bfd_section_vma (osect->the_bfd_section); |
| lma = bfd_section_lma (osect->the_bfd_section); |
| size = bfd_section_size (osect->the_bfd_section); |
| name = bfd_section_name (osect->the_bfd_section); |
| |
| gdb_printf ("Section %s, loaded at ", name); |
| gdb_puts (paddress (gdbarch, lma)); |
| gdb_puts (" - "); |
| gdb_puts (paddress (gdbarch, lma + size)); |
| gdb_printf (", mapped at "); |
| gdb_puts (paddress (gdbarch, vma)); |
| gdb_puts (" - "); |
| gdb_puts (paddress (gdbarch, vma + size)); |
| gdb_puts ("\n"); |
| |
| nmapped++; |
| } |
| } |
| if (nmapped == 0) |
| gdb_printf (_("No sections are mapped.\n")); |
| } |
| |
| /* Function: map_overlay_command |
| Mark the named section as mapped (ie. residing at its VMA address). */ |
| |
| static void |
| map_overlay_command (const char *args, int from_tty) |
| { |
| if (!overlay_debugging) |
| error (_("Overlay debugging not enabled. Use " |
| "either the 'overlay auto' or\n" |
| "the 'overlay manual' command.")); |
| |
| if (args == 0 || *args == 0) |
| error (_("Argument required: name of an overlay section")); |
| |
| /* First, find a section matching the user supplied argument. */ |
| for (objfile *obj_file : current_program_space->objfiles ()) |
| for (obj_section *sec : obj_file->sections ()) |
| if (!strcmp (bfd_section_name (sec->the_bfd_section), args)) |
| { |
| /* Now, check to see if the section is an overlay. */ |
| if (!section_is_overlay (sec)) |
| continue; /* not an overlay section */ |
| |
| /* Mark the overlay as "mapped". */ |
| sec->ovly_mapped = 1; |
| |
| /* Next, make a pass and unmap any sections that are |
| overlapped by this new section: */ |
| for (objfile *objfile2 : current_program_space->objfiles ()) |
| for (obj_section *sec2 : objfile2->sections ()) |
| if (sec2->ovly_mapped && sec != sec2 && sections_overlap (sec, |
| sec2)) |
| { |
| if (info_verbose) |
| gdb_printf (_("Note: section %s unmapped by overlap\n"), |
| bfd_section_name (sec2->the_bfd_section)); |
| sec2->ovly_mapped = 0; /* sec2 overlaps sec: unmap sec2. */ |
| } |
| return; |
| } |
| error (_("No overlay section called %s"), args); |
| } |
| |
| /* Function: unmap_overlay_command |
| Mark the overlay section as unmapped |
| (ie. resident in its LMA address range, rather than the VMA range). */ |
| |
| static void |
| unmap_overlay_command (const char *args, int from_tty) |
| { |
| if (!overlay_debugging) |
| error (_("Overlay debugging not enabled. " |
| "Use either the 'overlay auto' or\n" |
| "the 'overlay manual' command.")); |
| |
| if (args == 0 || *args == 0) |
| error (_("Argument required: name of an overlay section")); |
| |
| /* First, find a section matching the user supplied argument. */ |
| for (objfile *objfile : current_program_space->objfiles ()) |
| for (obj_section *sec : objfile->sections ()) |
| if (!strcmp (bfd_section_name (sec->the_bfd_section), args)) |
| { |
| if (!sec->ovly_mapped) |
| error (_("Section %s is not mapped"), args); |
| sec->ovly_mapped = 0; |
| return; |
| } |
| error (_("No overlay section called %s"), args); |
| } |
| |
| /* Function: overlay_auto_command |
| A utility command to turn on overlay debugging. |
| Possibly this should be done via a set/show command. */ |
| |
| static void |
| overlay_auto_command (const char *args, int from_tty) |
| { |
| overlay_debugging = ovly_auto; |
| enable_overlay_breakpoints (); |
<
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