/* Read HP PA/Risc object files for GDB. Copyright 1991, 1992 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 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include "defs.h" #include "bfd.h" #include "som.h" #include "libhppa.h" #include <syms.h> #include "symtab.h" #include "symfile.h" #include "objfiles.h" #include "buildsym.h" #include "stabsread.h" #include "gdb-stabs.h" #include "complaints.h" #include "gdb_string.h" #include "demangle.h" #include <sys/file.h> /* Various things we might complain about... */ static void som_symfile_init PARAMS ((struct objfile *)); static void som_new_init PARAMS ((struct objfile *)); static void som_symfile_read PARAMS ((struct objfile *, struct section_offsets *, int)); static void som_symfile_finish PARAMS ((struct objfile *)); static void som_symtab_read PARAMS ((bfd *, struct objfile *, struct section_offsets *)); static struct section_offsets * som_symfile_offsets PARAMS ((struct objfile *, CORE_ADDR)); static void record_minimal_symbol PARAMS ((char *, CORE_ADDR, enum minimal_symbol_type, struct objfile *)); static void record_minimal_symbol (name, address, ms_type, objfile) char *name; CORE_ADDR address; enum minimal_symbol_type ms_type; struct objfile *objfile; { name = obsavestring (name, strlen (name), &objfile -> symbol_obstack); prim_record_minimal_symbol (name, address, ms_type, objfile); } /* LOCAL FUNCTION som_symtab_read -- read the symbol table of a SOM file SYNOPSIS void som_symtab_read (bfd *abfd, struct objfile *objfile, struct section_offsets *section_offsets) DESCRIPTION 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 (abfd, objfile, section_offsets) bfd *abfd; struct objfile *objfile; struct section_offsets *section_offsets; { unsigned int number_of_symbols; int val, dynamic; char *stringtab; asection *shlib_info; struct symbol_dictionary_record *buf, *bufp, *endbufp; char *symname; CONST int symsize = sizeof (struct symbol_dictionary_record); CORE_ADDR text_offset, data_offset; text_offset = ANOFFSET (section_offsets, 0); data_offset = ANOFFSET (section_offsets, 1); number_of_symbols = bfd_get_symcount (abfd); buf = alloca (symsize * number_of_symbols); bfd_seek (abfd, obj_som_sym_filepos (abfd), SEEK_SET); val = bfd_read (buf, symsize * number_of_symbols, 1, abfd); if (val != symsize * number_of_symbols) error ("Couldn't read symbol dictionary!"); stringtab = alloca (obj_som_stringtab_size (abfd)); bfd_seek (abfd, obj_som_str_filepos (abfd), SEEK_SET); val = bfd_read (stringtab, obj_som_stringtab_size (abfd), 1, 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. The only reliable way I know of is to check for the existance of a $SHLIB_INFO$ section with a non-zero size. */ shlib_info = bfd_get_section_by_name (objfile->obfd, "$SHLIB_INFO$"); if (shlib_info) dynamic = (bfd_section_size (objfile->obfd, shlib_info) != 0); else dynamic = 0; endbufp = buf + number_of_symbols; for (bufp = buf; bufp < endbufp; ++bufp) { enum minimal_symbol_type ms_type; QUIT; switch (bufp->symbol_scope) { case SS_UNIVERSAL: case SS_EXTERNAL: switch (bufp->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 = bufp->name.n_strx + stringtab; ms_type = mst_text; bufp->symbol_value += text_offset; #ifdef SMASH_TEXT_ADDRESS SMASH_TEXT_ADDRESS (bufp->symbol_value); #endif break; case ST_ENTRY: symname = bufp->name.n_strx + 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; bufp->symbol_value += text_offset; #ifdef SMASH_TEXT_ADDRESS SMASH_TEXT_ADDRESS (bufp->symbol_value); #endif break; case ST_STUB: symname = bufp->name.n_strx + stringtab; ms_type = mst_solib_trampoline; bufp->symbol_value += text_offset; #ifdef SMASH_TEXT_ADDRESS SMASH_TEXT_ADDRESS (bufp->symbol_value); #endif break; case ST_DATA: symname = bufp->name.n_strx + stringtab; bufp->symbol_value += data_offset; 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 (bufp->symbol_type) { case ST_SYM_EXT: case ST_ARG_EXT: continue; case ST_CODE: symname = bufp->name.n_strx + stringtab; ms_type = mst_file_text; bufp->symbol_value += text_offset; #ifdef SMASH_TEXT_ADDRESS SMASH_TEXT_ADDRESS (bufp->symbol_value); #endif 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, "$PIC", 4) == 0)) continue; break; case ST_PRI_PROG: case ST_SEC_PROG: case ST_MILLICODE: symname = bufp->name.n_strx + stringtab; ms_type = mst_file_text; bufp->symbol_value += text_offset; #ifdef SMASH_TEXT_ADDRESS SMASH_TEXT_ADDRESS (bufp->symbol_value); #endif break; case ST_ENTRY: symname = bufp->name.n_strx + 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_file_text; bufp->symbol_value += text_offset; #ifdef SMASH_TEXT_ADDRESS SMASH_TEXT_ADDRESS (bufp->symbol_value); #endif break; case ST_STUB: symname = bufp->name.n_strx + stringtab; ms_type = mst_solib_trampoline; bufp->symbol_value += text_offset; #ifdef SMASH_TEXT_ADDRESS SMASH_TEXT_ADDRESS (bufp->symbol_value); #endif break; case ST_DATA: symname = bufp->name.n_strx + stringtab; bufp->symbol_value += data_offset; 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. */ case SS_UNSAT: switch (bufp->symbol_type) { case ST_STORAGE: symname = bufp->name.n_strx + stringtab; bufp->symbol_value += data_offset; ms_type = mst_data; break; default: continue; } break; default: continue; } if (bufp->name.n_strx > obj_som_stringtab_size (abfd)) error ("Invalid symbol data; bad HP string table offset: %d", bufp->name.n_strx); record_minimal_symbol (symname, bufp->symbol_value, ms_type, objfile); } } /* 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. MAINLINE is true if we are reading the main symbol table (as opposed to a shared lib or dynamically loaded file). 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: FIXME!!! 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 (objfile, section_offsets, mainline) struct objfile *objfile; struct section_offsets *section_offsets; int mainline; { bfd *abfd = objfile->obfd; struct cleanup *back_to; init_minimal_symbol_collection (); back_to = make_cleanup (discard_minimal_symbols, 0); /* Process the normal SOM symbol table first. */ som_symtab_read (abfd, objfile, section_offsets); /* Now read information from the stabs debug sections. */ stabsect_build_psymtabs (objfile, section_offsets, mainline, "$GDB_SYMBOLS$", "$GDB_STRINGS$", "$TEXT$"); /* Now read the native debug information. */ hpread_build_psymtabs (objfile, section_offsets, mainline); /* Install any minimal symbols that have been collected as the current minimal symbols for this objfile. */ install_minimal_symbols (objfile); /* Force hppa-tdep.c to re-read the unwind descriptors. */ objfile->obj_private = NULL; do_cleanups (back_to); } /* 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 (ignore) 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 (objfile) struct objfile *objfile; { if (objfile -> sym_stab_info != NULL) { mfree (objfile -> md, objfile -> sym_stab_info); } hpread_symfile_finish (objfile); } /* SOM specific initialization routine for reading symbols. Nothing SOM specific left to do anymore. */ static void som_symfile_init (objfile) struct objfile *objfile; { hpread_symfile_init (objfile); } /* SOM specific parsing routine for section offsets. Plain and simple for now. */ static struct section_offsets * som_symfile_offsets (objfile, addr) struct objfile *objfile; CORE_ADDR addr; { struct section_offsets *section_offsets; int i; objfile->num_sections = SECT_OFF_MAX; section_offsets = (struct section_offsets *) obstack_alloc (&objfile -> psymbol_obstack, sizeof (struct section_offsets) + sizeof (section_offsets->offsets) * (SECT_OFF_MAX-1)); /* First see if we're a shared library. If so, get the section offsets from the library, else get them from addr. */ if (!som_solib_section_offsets (objfile, section_offsets)) { for (i = 0; i < SECT_OFF_MAX; i++) ANOFFSET (section_offsets, i) = addr; } return section_offsets; } /* Register that we are able to handle SOM object file formats. */ static struct sym_fns som_sym_fns = { bfd_target_som_flavour, som_new_init, /* sym_new_init: init anything gbl to entire symtab */ som_symfile_init, /* sym_init: read initial info, setup for sym_read() */ som_symfile_read, /* sym_read: read a symbol file into symtab */ som_symfile_finish, /* sym_finish: finished with file, cleanup */ som_symfile_offsets, /* sym_offsets: Translate ext. to int. relocation */ NULL /* next: pointer to next struct sym_fns */ }; void _initialize_somread () { add_symtab_fns (&som_sym_fns); }