| /* Read HP PA/Risc object files for GDB. |
| Copyright (C) 1991-2014 Free Software Foundation, Inc. |
| Written by Fred Fish at Cygnus Support. |
| |
| 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 "defs.h" |
| #include "bfd.h" |
| #include "som/aout.h" |
| #include "symtab.h" |
| #include "symfile.h" |
| #include "objfiles.h" |
| #include "buildsym.h" |
| #include "stabsread.h" |
| #include "gdb-stabs.h" |
| #include "complaints.h" |
| #include "demangle.h" |
| #include "som.h" |
| #include "libhppa.h" |
| #include "psymtab.h" |
| |
| #include "solib-som.h" |
| |
| /* Read the symbol table of a SOM file. |
| |
| Given an open bfd, a base address to relocate symbols to, and a |
| flag that specifies whether or not this bfd is for an executable |
| or not (may be shared library for example), add all the global |
| function and data symbols to the minimal symbol table. */ |
| |
| static void |
| som_symtab_read (bfd *abfd, struct objfile *objfile, |
| struct section_offsets *section_offsets) |
| { |
| struct cleanup *cleanup; |
| struct gdbarch *gdbarch = get_objfile_arch (objfile); |
| unsigned int number_of_symbols; |
| int val, dynamic; |
| char *stringtab; |
| asection *shlib_info; |
| struct som_external_symbol_dictionary_record *buf, *bufp, *endbufp; |
| char *symname; |
| const int symsize = sizeof (struct som_external_symbol_dictionary_record); |
| |
| |
| number_of_symbols = bfd_get_symcount (abfd); |
| |
| /* Allocate a buffer to read in the debug info. |
| We avoid using alloca because the memory size could be so large |
| that we could hit the stack size limit. */ |
| buf = xmalloc (symsize * number_of_symbols); |
| cleanup = make_cleanup (xfree, buf); |
| bfd_seek (abfd, obj_som_sym_filepos (abfd), SEEK_SET); |
| val = bfd_bread (buf, symsize * number_of_symbols, abfd); |
| if (val != symsize * number_of_symbols) |
| error (_("Couldn't read symbol dictionary!")); |
| |
| /* Allocate a buffer to read in the som stringtab section of |
| the debugging info. Again, we avoid using alloca because |
| the data could be so large that we could potentially hit |
| the stack size limitat. */ |
| stringtab = xmalloc (obj_som_stringtab_size (abfd)); |
| make_cleanup (xfree, stringtab); |
| bfd_seek (abfd, obj_som_str_filepos (abfd), SEEK_SET); |
| val = bfd_bread (stringtab, obj_som_stringtab_size (abfd), abfd); |
| if (val != obj_som_stringtab_size (abfd)) |
| error (_("Can't read in HP string table.")); |
| |
| /* We need to determine if objfile is a dynamic executable (so we |
| can do the right thing for ST_ENTRY vs ST_CODE symbols). |
| |
| There's nothing in the header which easily allows us to do |
| this. |
| |
| This code used to rely upon the existence of a $SHLIB_INFO$ |
| section to make this determination. HP claims that it is |
| more accurate to check for a nonzero text offset, but they |
| have not provided any information about why that test is |
| more accurate. */ |
| dynamic = (ANOFFSET (section_offsets, SECT_OFF_TEXT (objfile)) != 0); |
| |
| endbufp = buf + number_of_symbols; |
| for (bufp = buf; bufp < endbufp; ++bufp) |
| { |
| enum minimal_symbol_type ms_type; |
| unsigned int flags = bfd_getb32 (bufp->flags); |
| unsigned int symbol_type |
| = (flags >> SOM_SYMBOL_TYPE_SH) & SOM_SYMBOL_TYPE_MASK; |
| unsigned int symbol_scope |
| = (flags >> SOM_SYMBOL_SCOPE_SH) & SOM_SYMBOL_SCOPE_MASK; |
| CORE_ADDR symbol_value = bfd_getb32 (bufp->symbol_value); |
| asection *section = NULL; |
| |
| QUIT; |
| |
| /* Compute the section. */ |
| switch (symbol_scope) |
| { |
| case SS_EXTERNAL: |
| if (symbol_type != ST_STORAGE) |
| section = bfd_und_section_ptr; |
| else |
| section = bfd_com_section_ptr; |
| break; |
| |
| case SS_UNSAT: |
| if (symbol_type != ST_STORAGE) |
| section = bfd_und_section_ptr; |
| else |
| section = bfd_com_section_ptr; |
| break; |
| |
| case SS_UNIVERSAL: |
| section = bfd_section_from_som_symbol (abfd, bufp); |
| break; |
| |
| case SS_LOCAL: |
| section = bfd_section_from_som_symbol (abfd, bufp); |
| break; |
| } |
| |
| switch (symbol_scope) |
| { |
| case SS_UNIVERSAL: |
| case SS_EXTERNAL: |
| switch (symbol_type) |
| { |
| case ST_SYM_EXT: |
| case ST_ARG_EXT: |
| continue; |
| |
| case ST_CODE: |
| case ST_PRI_PROG: |
| case ST_SEC_PROG: |
| case ST_MILLICODE: |
| symname = bfd_getb32 (bufp->name) + stringtab; |
| ms_type = mst_text; |
| symbol_value = gdbarch_addr_bits_remove (gdbarch, symbol_value); |
| break; |
| |
| case ST_ENTRY: |
| symname = bfd_getb32 (bufp->name) + stringtab; |
| /* For a dynamic executable, ST_ENTRY symbols are |
| the stubs, while the ST_CODE symbol is the real |
| function. */ |
| if (dynamic) |
| ms_type = mst_solib_trampoline; |
| else |
| ms_type = mst_text; |
| symbol_value = gdbarch_addr_bits_remove (gdbarch, symbol_value); |
| break; |
| |
| case ST_STUB: |
| symname = bfd_getb32 (bufp->name) + stringtab; |
| ms_type = mst_solib_trampoline; |
| symbol_value = gdbarch_addr_bits_remove (gdbarch, symbol_value); |
| break; |
| |
| case ST_DATA: |
| symname = bfd_getb32 (bufp->name) + stringtab; |
| ms_type = mst_data; |
| break; |
| default: |
| continue; |
| } |
| break; |
| |
| #if 0 |
| /* SS_GLOBAL and SS_LOCAL are two names for the same thing (!). */ |
| case SS_GLOBAL: |
| #endif |
| case SS_LOCAL: |
| switch (symbol_type) |
| { |
| case ST_SYM_EXT: |
| case ST_ARG_EXT: |
| continue; |
| |
| case ST_CODE: |
| symname = bfd_getb32 (bufp->name) + stringtab; |
| ms_type = mst_file_text; |
| symbol_value = gdbarch_addr_bits_remove (gdbarch, symbol_value); |
| |
| check_strange_names: |
| /* Utah GCC 2.5, FSF GCC 2.6 and later generate correct local |
| label prefixes for stabs, constant data, etc. So we need |
| only filter out L$ symbols which are left in due to |
| limitations in how GAS generates SOM relocations. |
| |
| When linking in the HPUX C-library the HP linker has |
| the nasty habit of placing section symbols from the literal |
| subspaces in the middle of the program's text. Filter |
| those out as best we can. Check for first and last character |
| being '$'. |
| |
| And finally, the newer HP compilers emit crud like $PIC_foo$N |
| in some circumstance (PIC code I guess). It's also claimed |
| that they emit D$ symbols too. What stupidity. */ |
| if ((symname[0] == 'L' && symname[1] == '$') |
| || (symname[0] == '$' && symname[strlen (symname) - 1] == '$') |
| || (symname[0] == 'D' && symname[1] == '$') |
| || (strncmp (symname, "L0\001", 3) == 0) |
| || (strncmp (symname, "$PIC", 4) == 0)) |
| continue; |
| break; |
| |
| case ST_PRI_PROG: |
| case ST_SEC_PROG: |
| case ST_MILLICODE: |
| symname = bfd_getb32 (bufp->name) + stringtab; |
| ms_type = mst_file_text; |
| symbol_value = gdbarch_addr_bits_remove (gdbarch, symbol_value); |
| break; |
| |
| case ST_ENTRY: |
| symname = bfd_getb32 (bufp->name) + stringtab; |
| /* SS_LOCAL symbols in a shared library do not have |
| export stubs, so we do not have to worry about |
| using mst_file_text vs mst_solib_trampoline here like |
| we do for SS_UNIVERSAL and SS_EXTERNAL symbols above. */ |
| ms_type = mst_file_text; |
| symbol_value = gdbarch_addr_bits_remove (gdbarch, symbol_value); |
| break; |
| |
| case ST_STUB: |
| symname = bfd_getb32 (bufp->name) + stringtab; |
| ms_type = mst_solib_trampoline; |
| symbol_value = gdbarch_addr_bits_remove (gdbarch, symbol_value); |
| break; |
| |
| |
| case ST_DATA: |
| symname = bfd_getb32 (bufp->name) + stringtab; |
| ms_type = mst_file_data; |
| goto check_strange_names; |
| |
| default: |
| continue; |
| } |
| break; |
| |
| /* This can happen for common symbols when -E is passed to the |
| final link. No idea _why_ that would make the linker force |
| common symbols to have an SS_UNSAT scope, but it does. |
| |
| This also happens for weak symbols, but their type is |
| ST_DATA. */ |
| case SS_UNSAT: |
| switch (symbol_type) |
| { |
| case ST_STORAGE: |
| case ST_DATA: |
| symname = bfd_getb32 (bufp->name) + stringtab; |
| ms_type = mst_data; |
| break; |
| |
| default: |
| continue; |
| } |
| break; |
| |
| default: |
| continue; |
| } |
| |
| if (bfd_getb32 (bufp->name) > obj_som_stringtab_size (abfd)) |
| error (_("Invalid symbol data; bad HP string table offset: %s"), |
| plongest (bfd_getb32 (bufp->name))); |
| |
| if (bfd_is_const_section (section)) |
| { |
| struct obj_section *iter; |
| |
| ALL_OBJFILE_OSECTIONS (objfile, iter) |
| { |
| CORE_ADDR start; |
| CORE_ADDR len; |
| |
| if (bfd_is_const_section (iter->the_bfd_section)) |
| continue; |
| |
| start = bfd_get_section_vma (iter->objfile->obfd, |
| iter->the_bfd_section); |
| len = bfd_get_section_size (iter->the_bfd_section); |
| if (start <= symbol_value && symbol_value < start + len) |
| { |
| section = iter->the_bfd_section; |
| break; |
| } |
| } |
| } |
| |
| prim_record_minimal_symbol_and_info (symname, symbol_value, ms_type, |
| gdb_bfd_section_index (objfile->obfd, |
| section), |
| objfile); |
| } |
| |
| do_cleanups (cleanup); |
| } |
| |
| /* Scan and build partial symbols for a symbol file. |
| We have been initialized by a call to som_symfile_init, which |
| currently does nothing. |
| |
| SECTION_OFFSETS is a set of offsets to apply to relocate the symbols |
| in each section. This is ignored, as it isn't needed for SOM. |
| |
| This function only does the minimum work necessary for letting the |
| user "name" things symbolically; it does not read the entire symtab. |
| Instead, it reads the external and static symbols and puts them in partial |
| symbol tables. When more extensive information is requested of a |
| file, the corresponding partial symbol table is mutated into a full |
| fledged symbol table by going back and reading the symbols |
| for real. |
| |
| We look for sections with specific names, to tell us what debug |
| format to look for. |
| |
| somstab_build_psymtabs() handles STABS symbols. |
| |
| Note that SOM files have a "minimal" symbol table, which is vaguely |
| reminiscent of a COFF symbol table, but has only the minimal information |
| necessary for linking. We process this also, and use the information to |
| build gdb's minimal symbol table. This gives us some minimal debugging |
| capability even for files compiled without -g. */ |
| |
| static void |
| som_symfile_read (struct objfile *objfile, int symfile_flags) |
| { |
| bfd *abfd = objfile->obfd; |
| struct cleanup *back_to; |
| |
| init_minimal_symbol_collection (); |
| back_to = make_cleanup_discard_minimal_symbols (); |
| |
| /* Process the normal SOM symbol table first. |
| This reads in the DNTT and string table, but doesn't |
| actually scan the DNTT. It does scan the linker symbol |
| table and thus build up a "minimal symbol table". */ |
| |
| som_symtab_read (abfd, objfile, objfile->section_offsets); |
| |
| /* Install any minimal symbols that have been collected as the current |
| minimal symbols for this objfile. |
| Further symbol-reading is done incrementally, file-by-file, |
| in a step known as "psymtab-to-symtab" expansion. hp-symtab-read.c |
| contains the code to do the actual DNTT scanning and symtab building. */ |
| install_minimal_symbols (objfile); |
| do_cleanups (back_to); |
| |
| /* Now read information from the stabs debug sections. |
| This is emitted by gcc. */ |
| stabsect_build_psymtabs (objfile, |
| "$GDB_SYMBOLS$", "$GDB_STRINGS$", "$TEXT$"); |
| } |
| |
| /* Initialize anything that needs initializing when a completely new symbol |
| file is specified (not just adding some symbols from another file, e.g. a |
| shared library). |
| |
| We reinitialize buildsym, since we may be reading stabs from a SOM file. */ |
| |
| static void |
| som_new_init (struct objfile *ignore) |
| { |
| stabsread_new_init (); |
| buildsym_new_init (); |
| } |
| |
| /* Perform any local cleanups required when we are done with a particular |
| objfile. I.e, we are in the process of discarding all symbol information |
| for an objfile, freeing up all memory held for it, and unlinking the |
| objfile struct from the global list of known objfiles. */ |
| |
| static void |
| som_symfile_finish (struct objfile *objfile) |
| { |
| } |
| |
| /* SOM specific initialization routine for reading symbols. */ |
| |
| static void |
| som_symfile_init (struct objfile *objfile) |
| { |
| /* SOM objects may be reordered, so set OBJF_REORDERED. If we |
| find this causes a significant slowdown in gdb then we could |
| set it in the debug symbol readers only when necessary. */ |
| objfile->flags |= OBJF_REORDERED; |
| } |
| |
| /* An object of this type is passed to find_section_offset. */ |
| |
| struct find_section_offset_arg |
| { |
| /* The objfile. */ |
| |
| struct objfile *objfile; |
| |
| /* Flags to invert. */ |
| |
| flagword invert; |
| |
| /* Flags to look for. */ |
| |
| flagword flags; |
| |
| /* A text section with non-zero size, if any. */ |
| |
| asection *best_section; |
| |
| /* An empty text section, if any. */ |
| |
| asection *empty_section; |
| }; |
| |
| /* A callback for bfd_map_over_sections that tries to find a section |
| with particular flags in an objfile. */ |
| |
| static void |
| find_section_offset (bfd *abfd, asection *sect, void *arg) |
| { |
| struct find_section_offset_arg *info = arg; |
| flagword aflag; |
| |
| aflag = bfd_get_section_flags (abfd, sect); |
| |
| aflag ^= info->invert; |
| |
| if ((aflag & info->flags) == info->flags) |
| { |
| if (bfd_section_size (abfd, sect) > 0) |
| { |
| if (info->best_section == NULL) |
| info->best_section = sect; |
| } |
| else |
| { |
| if (info->empty_section == NULL) |
| info->empty_section = sect; |
| } |
| } |
| } |
| |
| /* Set a section index from a BFD. */ |
| |
| static void |
| set_section_index (struct objfile *objfile, flagword invert, flagword flags, |
| int *index_ptr) |
| { |
| struct find_section_offset_arg info; |
| |
| info.objfile = objfile; |
| info.best_section = NULL; |
| info.empty_section = NULL; |
| info.invert = invert; |
| info.flags = flags; |
| bfd_map_over_sections (objfile->obfd, find_section_offset, &info); |
| |
| if (info.best_section) |
| *index_ptr = info.best_section->index; |
| else if (info.empty_section) |
| *index_ptr = info.empty_section->index; |
| } |
| |
| /* SOM specific parsing routine for section offsets. |
| |
| Plain and simple for now. */ |
| |
| static void |
| som_symfile_offsets (struct objfile *objfile, |
| const struct section_addr_info *addrs) |
| { |
| int i; |
| CORE_ADDR text_addr; |
| asection *sect; |
| |
| objfile->num_sections = bfd_count_sections (objfile->obfd); |
| objfile->section_offsets = (struct section_offsets *) |
| obstack_alloc (&objfile->objfile_obstack, |
| SIZEOF_N_SECTION_OFFSETS (objfile->num_sections)); |
| |
| set_section_index (objfile, 0, SEC_ALLOC | SEC_CODE, |
| &objfile->sect_index_text); |
| set_section_index (objfile, 0, SEC_ALLOC | SEC_DATA, |
| &objfile->sect_index_data); |
| set_section_index (objfile, SEC_LOAD, SEC_ALLOC | SEC_LOAD, |
| &objfile->sect_index_bss); |
| set_section_index (objfile, 0, SEC_ALLOC | SEC_READONLY, |
| &objfile->sect_index_rodata); |
| |
| /* First see if we're a shared library. If so, get the section |
| offsets from the library, else get them from addrs. */ |
| if (!som_solib_section_offsets (objfile, objfile->section_offsets)) |
| { |
| /* Note: Here is OK to compare with ".text" because this is the |
| name that gdb itself gives to that section, not the SOM |
| name. */ |
| for (i = 0; i < addrs->num_sections; i++) |
| if (strcmp (addrs->other[i].name, ".text") == 0) |
| break; |
| text_addr = addrs->other[i].addr; |
| |
| for (i = 0; i < objfile->num_sections; i++) |
| (objfile->section_offsets)->offsets[i] = text_addr; |
| } |
| } |
| |
| |
| |
| /* Register that we are able to handle SOM object file formats. */ |
| |
| static const struct sym_fns som_sym_fns = |
| { |
| som_new_init, /* init anything gbl to entire symtab */ |
| som_symfile_init, /* read initial info, setup for sym_read() */ |
| som_symfile_read, /* read a symbol file into symtab */ |
| NULL, /* sym_read_psymbols */ |
| som_symfile_finish, /* finished with file, cleanup */ |
| som_symfile_offsets, /* Translate ext. to int. relocation */ |
| default_symfile_segments, /* Get segment information from a file. */ |
| NULL, |
| default_symfile_relocate, /* Relocate a debug section. */ |
| NULL, /* sym_get_probes */ |
| &psym_functions |
| }; |
| |
| initialize_file_ftype _initialize_somread; |
| |
| void |
| _initialize_somread (void) |
| { |
| add_symtab_fns (bfd_target_som_flavour, &som_sym_fns); |
| } |