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authorStan Shebs <shebs@codesourcery.com>1999-04-16 01:35:26 +0000
committerStan Shebs <shebs@codesourcery.com>1999-04-16 01:35:26 +0000
commitc906108c21474dfb4ed285bcc0ac6fe02cd400cc (patch)
treea0015aa5cedc19ccbab307251353a41722a3ae13 /gdb/somread.c
parentcd946cff9ede3f30935803403f06f6ed30cad136 (diff)
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Initial creation of sourceware repositorygdb-4_18-branchpoint
Diffstat (limited to 'gdb/somread.c')
-rw-r--r--gdb/somread.c803
1 files changed, 803 insertions, 0 deletions
diff --git a/gdb/somread.c b/gdb/somread.c
new file mode 100644
index 0000000..c03abd0
--- /dev/null
+++ b/gdb/somread.c
@@ -0,0 +1,803 @@
+/* Read HP PA/Risc object files for GDB.
+ Copyright 1991, 1992, 1996 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 <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 "som.h"
+#include "libhppa.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));
+
+/* FIXME: These should really be in a common header somewhere */
+
+extern void
+hpread_build_psymtabs PARAMS ((struct objfile *, struct section_offsets *, int));
+
+extern void
+hpread_symfile_finish PARAMS ((struct objfile *));
+
+extern void
+hpread_symfile_init PARAMS ((struct objfile *));
+
+extern void
+do_pxdb PARAMS ((bfd *));
+
+/*
+
+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. */
+ /* The code below is not a reliable way to check whether an
+ * executable is dynamic, so I commented it out - RT
+ * 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;
+ */
+ /* I replaced the code with a simple check for text offset not being
+ * zero. Still not 100% reliable, but a more reliable way of asking
+ * "is this a dynamic executable?" than the above. RT
+ */
+ dynamic = (text_offset != 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.
+
+ This also happens for weak symbols, but their type is
+ ST_DATA. */
+ case SS_UNSAT:
+ switch (bufp->symbol_type)
+ {
+ case ST_STORAGE:
+ case ST_DATA:
+ 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);
+
+ prim_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;
+
+ do_pxdb (symfile_bfd_open (objfile->name));
+
+ init_minimal_symbol_collection ();
+ back_to = make_cleanup ((make_cleanup_func) discard_minimal_symbols, 0);
+
+ /* Read in the import list and the export list. Currently
+ the export list isn't used; the import list is used in
+ hp-symtab-read.c to handle static vars declared in other
+ shared libraries. */
+ init_import_symbols (objfile);
+#if 0 /* Export symbols not used today 1997-08-05 */
+ init_export_symbols (objfile);
+#else
+ objfile->export_list = NULL;
+ objfile->export_list_size = 0;
+#endif
+
+ /* 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, section_offsets);
+
+ /* Now read information from the stabs debug sections.
+ This is a no-op for SOM.
+ Perhaps it is intended for some kind of mixed STABS/SOM
+ situation? */
+ stabsect_build_psymtabs (objfile, section_offsets, mainline,
+ "$GDB_SYMBOLS$", "$GDB_STRINGS$", "$TEXT$");
+
+ /* Now read the native debug information.
+ This builds the psymtab. This used to be done via a scan of
+ the DNTT, but is now done via the PXDB-built quick-lookup tables
+ together with a scan of the GNTT. See hp-psymtab-read.c. */
+ hpread_build_psymtabs (objfile, section_offsets, mainline);
+
+ /* 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);
+
+ /* 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. */
+
+static void
+som_symfile_init (objfile)
+ 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;
+ 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_SECTION_OFFSETS);
+
+ /* 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;
+}
+
+
+
+/* Check if a given symbol NAME is in the import list
+ of OBJFILE.
+ 1 => true, 0 => false
+ This is used in hp_symtab_read.c to deal with static variables
+ that are defined in a different shared library than the one
+ whose symbols are being processed. */
+
+int is_in_import_list (name, objfile)
+ char * name;
+ struct objfile * objfile;
+{
+ register int i;
+
+ if (!objfile ||
+ !name ||
+ !*name)
+ return 0;
+
+ for (i=0; i < objfile->import_list_size; i++)
+ if (objfile->import_list[i] && STREQ (name, objfile->import_list[i]))
+ return 1;
+ return 0;
+}
+
+
+/* Read in and initialize the SOM import list which is present
+ for all executables and shared libraries. The import list
+ consists of the symbols that are referenced in OBJFILE but
+ not defined there. (Variables that are imported are dealt
+ with as "loc_indirect" vars.)
+ Return value = number of import symbols read in. */
+int
+init_import_symbols (objfile)
+ struct objfile * objfile;
+{
+ unsigned int import_list;
+ unsigned int import_list_size;
+ unsigned int string_table;
+ unsigned int string_table_size;
+ char * string_buffer;
+ register int i;
+ register int j;
+ register int k;
+ asection * text_section; /* section handle */
+ unsigned int dl_header[12]; /* SOM executable header */
+
+ /* A struct for an entry in the SOM import list */
+ typedef struct {
+ int name; /* index into the string table */
+ short dont_care1; /* we don't use this */
+ unsigned char type; /* 0 = NULL, 2 = Data, 3 = Code, 7 = Storage, 13 = Plabel */
+ unsigned int reserved2 : 8; /* not used */
+ } SomImportEntry;
+
+ /* We read 100 entries in at a time from the disk file. */
+# define SOM_READ_IMPORTS_NUM 100
+# define SOM_READ_IMPORTS_CHUNK_SIZE (sizeof (SomImportEntry) * SOM_READ_IMPORTS_NUM)
+ SomImportEntry buffer[SOM_READ_IMPORTS_NUM];
+
+ /* Initialize in case we error out */
+ objfile->import_list = NULL;
+ objfile->import_list_size = 0;
+
+#if 0 /* DEBUGGING */
+ printf ("Processing import list for %s\n", objfile->name);
+#endif
+
+ /* It doesn't work, for some reason, to read in space $TEXT$;
+ the subspace $SHLIB_INFO$ has to be used. Some BFD quirk? pai/1997-08-05 */
+ text_section = bfd_get_section_by_name (objfile->obfd, "$SHLIB_INFO$");
+ if (!text_section)
+ return 0;
+ /* Get the SOM executable header */
+ bfd_get_section_contents (objfile->obfd, text_section, dl_header, 0, 12 * sizeof (int));
+
+ /* Check header version number for 10.x HP-UX */
+ /* Currently we deal only with 10.x systems; on 9.x the version # is 89060912.
+ FIXME: Change for future HP-UX releases and mods to the SOM executable format */
+ if (dl_header[0] != 93092112)
+ return 0;
+
+ import_list = dl_header[4];
+ import_list_size = dl_header[5];
+ if (!import_list_size)
+ return 0;
+ string_table = dl_header[10];
+ string_table_size = dl_header[11];
+ if (!string_table_size)
+ return 0;
+
+ /* Suck in SOM string table */
+ string_buffer = (char *) xmalloc (string_table_size);
+ bfd_get_section_contents (objfile->obfd, text_section, string_buffer,
+ string_table, string_table_size);
+
+ /* Allocate import list in the psymbol obstack; this has nothing
+ to do with psymbols, just a matter of convenience. We want the
+ import list to be freed when the objfile is deallocated */
+ objfile->import_list
+ = (ImportEntry *) obstack_alloc (&objfile->psymbol_obstack,
+ import_list_size * sizeof (ImportEntry));
+
+ /* Read in the import entries, a bunch at a time */
+ for (j=0, k=0;
+ j < (import_list_size / SOM_READ_IMPORTS_NUM);
+ j++)
+ {
+ bfd_get_section_contents (objfile->obfd, text_section, buffer,
+ import_list + j * SOM_READ_IMPORTS_CHUNK_SIZE,
+ SOM_READ_IMPORTS_CHUNK_SIZE);
+ for (i=0; i < SOM_READ_IMPORTS_NUM; i++, k++)
+ {
+ if (buffer[i].type != (unsigned char) 0)
+ {
+ objfile->import_list[k]
+ = (char *) obstack_alloc (&objfile->psymbol_obstack, strlen (string_buffer + buffer[i].name) + 1);
+ strcpy (objfile->import_list[k], string_buffer + buffer[i].name);
+ /* Some day we might want to record the type and other information too */
+ }
+ else /* null type */
+ objfile->import_list[k] = NULL;
+
+#if 0 /* DEBUGGING */
+ printf ("Import String %d:%d (%d), type %d is %s\n", j, i, k,
+ (int) buffer[i].type, objfile->import_list[k]);
+#endif
+ }
+ }
+
+ /* Get the leftovers */
+ if (k < import_list_size)
+ bfd_get_section_contents (objfile->obfd, text_section, buffer,
+ import_list + k * sizeof (SomImportEntry),
+ (import_list_size - k) * sizeof (SomImportEntry));
+ for (i=0; k < import_list_size; i++, k++)
+ {
+ if (buffer[i].type != (unsigned char) 0)
+ {
+ objfile->import_list[k]
+ = (char *) obstack_alloc (&objfile->psymbol_obstack, strlen (string_buffer + buffer[i].name) + 1);
+ strcpy (objfile->import_list[k], string_buffer + buffer[i].name);
+ /* Some day we might want to record the type and other information too */
+ }
+ else
+ objfile->import_list[k] = NULL;
+#if 0 /* DEBUGGING */
+ printf ("Import String F:%d (%d), type %d, is %s\n", i, k,
+ (int) buffer[i].type, objfile->import_list[k]);
+#endif
+ }
+
+ objfile->import_list_size = import_list_size;
+ free (string_buffer);
+ return import_list_size;
+}
+
+/* Read in and initialize the SOM export list which is present
+ for all executables and shared libraries. The import list
+ consists of the symbols that are referenced in OBJFILE but
+ not defined there. (Variables that are imported are dealt
+ with as "loc_indirect" vars.)
+ Return value = number of import symbols read in. */
+int
+init_export_symbols (objfile)
+ struct objfile * objfile;
+{
+ unsigned int export_list;
+ unsigned int export_list_size;
+ unsigned int string_table;
+ unsigned int string_table_size;
+ char * string_buffer;
+ register int i;
+ register int j;
+ register int k;
+ asection * text_section; /* section handle */
+ unsigned int dl_header[12]; /* SOM executable header */
+
+ /* A struct for an entry in the SOM export list */
+ typedef struct {
+ int next; /* for hash table use -- we don't use this */
+ int name; /* index into string table */
+ int value; /* offset or plabel */
+ int dont_care1; /* not used */
+ unsigned char type; /* 0 = NULL, 2 = Data, 3 = Code, 7 = Storage, 13 = Plabel */
+ char dont_care2; /* not used */
+ short dont_care3; /* not used */
+ } SomExportEntry;
+
+ /* We read 100 entries in at a time from the disk file. */
+# define SOM_READ_EXPORTS_NUM 100
+# define SOM_READ_EXPORTS_CHUNK_SIZE (sizeof (SomExportEntry) * SOM_READ_EXPORTS_NUM)
+ SomExportEntry buffer[SOM_READ_EXPORTS_NUM];
+
+ /* Initialize in case we error out */
+ objfile->export_list = NULL;
+ objfile->export_list_size = 0;
+
+#if 0 /* DEBUGGING */
+ printf ("Processing export list for %s\n", objfile->name);
+#endif
+
+ /* It doesn't work, for some reason, to read in space $TEXT$;
+ the subspace $SHLIB_INFO$ has to be used. Some BFD quirk? pai/1997-08-05 */
+ text_section = bfd_get_section_by_name (objfile->obfd, "$SHLIB_INFO$");
+ if (!text_section)
+ return 0;
+ /* Get the SOM executable header */
+ bfd_get_section_contents (objfile->obfd, text_section, dl_header, 0, 12 * sizeof (int));
+
+ /* Check header version number for 10.x HP-UX */
+ /* Currently we deal only with 10.x systems; on 9.x the version # is 89060912.
+ FIXME: Change for future HP-UX releases and mods to the SOM executable format */
+ if (dl_header[0] != 93092112)
+ return 0;
+
+ export_list = dl_header[8];
+ export_list_size = dl_header[9];
+ if (!export_list_size)
+ return 0;
+ string_table = dl_header[10];
+ string_table_size = dl_header[11];
+ if (!string_table_size)
+ return 0;
+
+ /* Suck in SOM string table */
+ string_buffer = (char *) xmalloc (string_table_size);
+ bfd_get_section_contents (objfile->obfd, text_section, string_buffer,
+ string_table, string_table_size);
+
+ /* Allocate export list in the psymbol obstack; this has nothing
+ to do with psymbols, just a matter of convenience. We want the
+ export list to be freed when the objfile is deallocated */
+ objfile->export_list
+ = (ExportEntry *) obstack_alloc (&objfile->psymbol_obstack,
+ export_list_size * sizeof (ExportEntry));
+
+ /* Read in the export entries, a bunch at a time */
+ for (j=0, k=0;
+ j < (export_list_size / SOM_READ_EXPORTS_NUM);
+ j++)
+ {
+ bfd_get_section_contents (objfile->obfd, text_section, buffer,
+ export_list + j * SOM_READ_EXPORTS_CHUNK_SIZE,
+ SOM_READ_EXPORTS_CHUNK_SIZE);
+ for (i=0; i < SOM_READ_EXPORTS_NUM; i++, k++)
+ {
+ if (buffer[i].type != (unsigned char) 0)
+ {
+ objfile->export_list[k].name
+ = (char *) obstack_alloc (&objfile->psymbol_obstack, strlen (string_buffer + buffer[i].name) + 1);
+ strcpy (objfile->export_list[k].name, string_buffer + buffer[i].name);
+ objfile->export_list[k].address = buffer[i].value;
+ /* Some day we might want to record the type and other information too */
+ }
+ else /* null type */
+ {
+ objfile->export_list[k].name = NULL;
+ objfile->export_list[k].address = 0;
+ }
+#if 0 /* DEBUGGING */
+ printf ("Export String %d:%d (%d), type %d is %s\n", j, i, k,
+ (int) buffer[i].type, objfile->export_list[k].name);
+#endif
+ }
+ }
+
+ /* Get the leftovers */
+ if (k < export_list_size)
+ bfd_get_section_contents (objfile->obfd, text_section, buffer,
+ export_list + k * sizeof (SomExportEntry),
+ (export_list_size - k) * sizeof (SomExportEntry));
+ for (i=0; k < export_list_size; i++, k++)
+ {
+ if (buffer[i].type != (unsigned char) 0)
+ {
+ objfile->export_list[k].name
+ = (char *) obstack_alloc (&objfile->psymbol_obstack, strlen (string_buffer + buffer[i].name) + 1);
+ strcpy (objfile->export_list[k].name, string_buffer + buffer[i].name);
+ /* Some day we might want to record the type and other information too */
+ objfile->export_list[k].address = buffer[i].value;
+ }
+ else
+ {
+ objfile->export_list[k].name = NULL;
+ objfile->export_list[k].address = 0;
+ }
+#if 0 /* DEBUGGING */
+ printf ("Export String F:%d (%d), type %d, value %x is %s\n", i, k,
+ (int) buffer[i].type, buffer[i].value, objfile->export_list[k].name);
+#endif
+ }
+
+ objfile->export_list_size = export_list_size;
+ free (string_buffer);
+ return export_list_size;
+}
+
+
+
+/* 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);
+}