-/* 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
-
-#include "defs.h"
-#include "bfd.h"
-#include <time.h> /* For time_t in libbfd.h. */
-#include <sys/types.h> /* For time_t, if not in time.h. */
-#include "libbfd.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 <string.h>
-#include "demangle.h"
-#include <sys/file.h>
-
-/* Size of n_value and n_strx fields in a stab symbol. */
-#define BYTES_IN_WORD 4
-
-#include "aout/aout64.h"
-
-/* Various things we might complain about... */
-
-static void
-pa_symfile_init PARAMS ((struct objfile *));
-
-static int
-compare_unwind_entries PARAMS ((struct unwind_table_entry *,
- struct unwind_table_entry *));
-
-static void
-pa_new_init PARAMS ((struct objfile *));
-
-static void
-read_unwind_info PARAMS ((struct objfile *));
-
-static void
-pa_symfile_read PARAMS ((struct objfile *, struct section_offsets *, int));
-
-static void
-pa_symfile_finish PARAMS ((struct objfile *));
-
-static void
-pa_symtab_read PARAMS ((bfd *, CORE_ADDR, struct objfile *));
-
-static void
-free_painfo PARAMS ((PTR));
-
-static struct section_offsets *
-pa_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
-
- pa_symtab_read -- read the symbol table of a PA file
-
-SYNOPSIS
-
- void pa_symtab_read (bfd *abfd, CORE_ADDR addr,
- struct objfile *objfile)
-
-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
-pa_symtab_read (abfd, addr, objfile)
- bfd *abfd;
- CORE_ADDR addr;
- struct objfile *objfile;
-{
- unsigned int number_of_symbols;
- unsigned int i;
- int val;
- char *stringtab;
- struct symbol_dictionary_record *buf, *bufp, *endbufp;
- char *symname;
- CONST int symsize = sizeof (struct symbol_dictionary_record);
-
- number_of_symbols = bfd_get_symcount (abfd);
-
- buf = alloca (symsize * number_of_symbols);
- bfd_seek (abfd, obj_som_sym_filepos (abfd), L_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), L_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.");
-
- 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:
- 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_ENTRY:
- case ST_MILLICODE:
- symname = bufp->name.n_strx + stringtab;
- ms_type = mst_text;
-#ifdef SMASH_TEXT_ADDRESS
- SMASH_TEXT_ADDRESS (bufp->symbol_value);
-#endif
- break;
- case ST_DATA:
- symname = bufp->name.n_strx + 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 (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;
-#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 '$'. */
- if ((symname[0] == 'L' && symname[1] == '$')
- || (symname[0] == '$' && symname[strlen(symname) - 1] == '$'))
- continue;
- break;
-
- case ST_PRI_PROG:
- case ST_SEC_PROG:
- case ST_ENTRY:
- case ST_MILLICODE:
- symname = bufp->name.n_strx + stringtab;
- ms_type = mst_file_text;
-#ifdef SMASH_TEXT_ADDRESS
- SMASH_TEXT_ADDRESS (bufp->symbol_value);
-#endif
- break;
-
- case ST_DATA:
- symname = bufp->name.n_strx + stringtab;
- ms_type = mst_file_data;
- goto check_strange_names;
-
- 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);
- }
-
- install_minimal_symbols (objfile);
-}
-
-/* Compare the start address for two unwind entries returning 1 if
- the first address is larger than the second, -1 if the second is
- larger than the first, and zero if they are equal. */
-
-static int
-compare_unwind_entries (a, b)
- struct unwind_table_entry *a;
- struct unwind_table_entry *b;
-{
- if (a->region_start > b->region_start)
- return 1;
- else if (a->region_start < b->region_start)
- return -1;
- else
- return 0;
-}
-
-/* Read in the backtrace information stored in the `$UNWIND_START$' section of
- the object file. This info is used mainly by find_unwind_entry() to find
- out the stack frame size and frame pointer used by procedures. We put
- everything on the psymbol obstack in the objfile so that it automatically
- gets freed when the objfile is destroyed. */
-
-static void
-read_unwind_info (objfile)
- struct objfile *objfile;
-{
- asection *unwind_sec, *stub_unwind_sec;
- unsigned unwind_size, stub_unwind_size, total_size;
- unsigned index, unwind_entries, stub_entries, total_entries;
- struct obj_unwind_info *ui;
-
- ui = obstack_alloc (&objfile->psymbol_obstack,
- sizeof (struct obj_unwind_info));
-
- ui->table = NULL;
- ui->cache = NULL;
- ui->last = -1;
-
- /* Get hooks to both unwind sections. */
- unwind_sec = bfd_get_section_by_name (objfile->obfd, "$UNWIND_START$");
- stub_unwind_sec = bfd_get_section_by_name (objfile->obfd, "$UNWIND_END$");
-
- /* Get sizes and unwind counts for both sections. */
- if (unwind_sec)
- {
- unwind_size = bfd_section_size (objfile->obfd, unwind_sec);
- unwind_entries = unwind_size / UNWIND_ENTRY_SIZE;
- }
- else
- {
- unwind_size = 0;
- unwind_entries = 0;
- }
-
- if (stub_unwind_sec)
- {
- stub_unwind_size = bfd_section_size (objfile->obfd, stub_unwind_sec);
- stub_entries = stub_unwind_size / STUB_UNWIND_ENTRY_SIZE;
- }
- else
- {
- stub_unwind_size = 0;
- stub_entries = 0;
- }
-
- /* Compute total number of stubs. */
- total_entries = unwind_entries + stub_entries;
- total_size = total_entries * sizeof (struct unwind_table_entry);
-
- /* Allocate memory for the unwind table. */
- ui->table = obstack_alloc (&objfile->psymbol_obstack, total_size);
- ui->last = total_entries - 1;
-
- /* We will read the unwind entries into temporary memory, then
- fill in the actual unwind table. */
- if (unwind_size > 0)
- {
- unsigned long tmp;
- unsigned i;
- char *buf = alloca (unwind_size);
-
- bfd_get_section_contents (objfile->obfd, unwind_sec, buf, 0, unwind_size);
-
- /* Now internalize the information being careful to handle host/target
- endian issues. */
- for (i = 0; i < unwind_entries; i++)
- {
- ui->table[i].region_start = bfd_get_32 (objfile->obfd,
- (bfd_byte *)buf);
- buf += 4;
- ui->table[i].region_end = bfd_get_32 (objfile->obfd, (bfd_byte *)buf);
- buf += 4;
- tmp = bfd_get_32 (objfile->obfd, (bfd_byte *)buf);
- buf += 4;
- ui->table[i].Cannot_unwind = (tmp >> 31) & 0x1;;
- ui->table[i].Millicode = (tmp >> 30) & 0x1;
- ui->table[i].Millicode_save_sr0 = (tmp >> 29) & 0x1;
- ui->table[i].Region_description = (tmp >> 27) & 0x3;
- ui->table[i].reserved1 = (tmp >> 26) & 0x1;
- ui->table[i].Entry_SR = (tmp >> 25) & 0x1;
- ui->table[i].Entry_FR = (tmp >> 21) & 0xf;
- ui->table[i].Entry_GR = (tmp >> 16) & 0x1f;
- ui->table[i].Args_stored = (tmp >> 15) & 0x1;
- ui->table[i].Variable_Frame = (tmp >> 14) & 0x1;
- ui->table[i].Separate_Package_Body = (tmp >> 13) & 0x1;
- ui->table[i].Frame_Extension_Millicode = (tmp >> 12 ) & 0x1;
- ui->table[i].Stack_Overflow_Check = (tmp >> 11) & 0x1;
- ui->table[i].Two_Instruction_SP_Increment = (tmp >> 10) & 0x1;
- ui->table[i].Ada_Region = (tmp >> 9) & 0x1;
- ui->table[i].reserved2 = (tmp >> 5) & 0xf;
- ui->table[i].Save_SP = (tmp >> 4) & 0x1;
- ui->table[i].Save_RP = (tmp >> 3) & 0x1;
- ui->table[i].Save_MRP_in_frame = (tmp >> 2) & 0x1;
- ui->table[i].extn_ptr_defined = (tmp >> 1) & 0x1;
- ui->table[i].Cleanup_defined = tmp & 0x1;
- tmp = bfd_get_32 (objfile->obfd, (bfd_byte *)buf);
- buf += 4;
- ui->table[i].MPE_XL_interrupt_marker = (tmp >> 31) & 0x1;
- ui->table[i].HP_UX_interrupt_marker = (tmp >> 30) & 0x1;
- ui->table[i].Large_frame = (tmp >> 29) & 0x1;
- ui->table[i].reserved4 = (tmp >> 27) & 0x3;
- ui->table[i].Total_frame_size = tmp & 0x7ffffff;
- }
-
- }
-
- if (stub_unwind_size > 0)
- {
- unsigned int i;
- char *buf = alloca (stub_unwind_size);
-
- /* Read in the stub unwind entries. */
- bfd_get_section_contents (objfile->obfd, stub_unwind_sec, buf,
- 0, stub_unwind_size);
-
- /* Now convert them into regular unwind entries. */
- index = unwind_entries;
- for (i = 0; i < stub_entries; i++, index++)
- {
- /* Clear out the next unwind entry. */
- memset (&ui->table[index], 0, sizeof (struct unwind_table_entry));
-
- /* Convert offset & size into region_start and region_end.
- Stuff away the stub type into "reserved" fields. */
- ui->table[index].region_start = bfd_get_32 (objfile->obfd,
- (bfd_byte *) buf);
- buf += 4;
- ui->table[index].stub_type = bfd_get_8 (objfile->obfd,
- (bfd_byte *) buf);
- buf += 2;
- ui->table[index].region_end
- = ui->table[index].region_start + 4 *
- (bfd_get_16 (objfile->obfd, (bfd_byte *) buf) - 1);
- buf += 2;
- }
-
- }
-
- /* Unwind table needs to be kept sorted. */
- qsort (ui->table, total_entries, sizeof (struct unwind_table_entry),
- compare_unwind_entries);
-
- /* Keep a pointer to the unwind information. */
- objfile->obj_private = (PTR) ui;
-}
-
-/* Scan and build partial symbols for a symbol file.
- We have been initialized by a call to pa_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 the PA.
-
- 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!!!
-
- pastab_build_psymtabs() handles STABS symbols.
-
- Note that PA 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
-pa_symfile_read (objfile, section_offsets, mainline)
- struct objfile *objfile;
- struct section_offsets *section_offsets;
- int mainline;
-{
- bfd *abfd = objfile->obfd;
- struct cleanup *back_to;
- CORE_ADDR offset;
-
- init_minimal_symbol_collection ();
- back_to = make_cleanup (discard_minimal_symbols, 0);
-
- make_cleanup (free_painfo, (PTR) objfile);
-
- /* Process the normal PA symbol table first. */
-
- /* FIXME, should take a section_offsets param, not just an offset. */
-
- offset = ANOFFSET (section_offsets, 0);
- pa_symtab_read (abfd, offset, objfile);
-
- /* Now process debugging information, which is contained in
- special PA sections. */
-
- pastab_build_psymtabs (objfile, section_offsets, mainline);
-
- read_unwind_info(objfile);
-
- do_cleanups (back_to);
-}
-
-/* This cleans up the objfile's sym_stab_info pointer, and the chain of
- stab_section_info's, that might be dangling from it. */
-
-static void
-free_painfo (objp)
- PTR objp;
-{
- struct objfile *objfile = (struct objfile *)objp;
- struct dbx_symfile_info *dbxinfo = (struct dbx_symfile_info *)
- objfile->sym_stab_info;
- struct stab_section_info *ssi, *nssi;
-
- ssi = dbxinfo->stab_section_info;
- while (ssi)
- {
- nssi = ssi->next;
- mfree (objfile->md, ssi);
- ssi = nssi;
- }
-
- dbxinfo->stab_section_info = 0; /* Just say No mo info about this. */
-}
-
-/* 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 PA file. */
-
-static void
-pa_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
-pa_symfile_finish (objfile)
- struct objfile *objfile;
-{
- if (objfile -> sym_stab_info != NULL)
- {
- mfree (objfile -> md, objfile -> sym_stab_info);
- }
-}
-
-/* PA specific initialization routine for reading symbols.
-
- It is passed a pointer to a struct sym_fns which contains, among other
- things, the BFD for the file whose symbols are being read, and a slot for
- a pointer to "private data" which we can fill with goodies.
-
- This routine is almost a complete ripoff of dbx_symfile_init. The
- common parts of these routines should be extracted and used instead of
- duplicating this code. FIXME. */
-
-static void
-pa_symfile_init (objfile)
- struct objfile *objfile;
-{
- int val;
- bfd *sym_bfd = objfile->obfd;
- char *name = bfd_get_filename (sym_bfd);
- asection *stabsect; /* Section containing symbol table entries */
- asection *stringsect; /* Section containing symbol name strings */
-
- stabsect = bfd_get_section_by_name (sym_bfd, "$GDB_SYMBOLS$");
- stringsect = bfd_get_section_by_name (sym_bfd, "$GDB_STRINGS$");
-
- /* Allocate struct to keep track of the symfile */
- objfile->sym_stab_info = (PTR)
- xmmalloc (objfile -> md, sizeof (struct dbx_symfile_info));
-
- memset ((PTR) objfile->sym_stab_info, 0, sizeof (struct dbx_symfile_info));
-
-
- /* FIXME POKING INSIDE BFD DATA STRUCTURES */
-#define STRING_TABLE_OFFSET (stringsect->filepos)
-#define SYMBOL_TABLE_OFFSET (stabsect->filepos)
-
- /* FIXME POKING INSIDE BFD DATA STRUCTURES */
-
- DBX_SYMFILE_INFO (objfile)->stab_section_info = NULL;
- DBX_TEXT_SECT (objfile) = bfd_get_section_by_name (sym_bfd, "$TEXT$");
- if (!DBX_TEXT_SECT (objfile))
- error ("Can't find $TEXT$ section in symbol file");
-
- if (!stabsect)
- return;
-
- if (!stringsect)
- error ("Found stabs, but not string section");
-
- /* FIXME: I suspect this should be external_nlist. The size of host
- types like long and bfd_vma should not affect how we read the
- file. */
- DBX_SYMBOL_SIZE (objfile) = sizeof (struct internal_nlist);
- DBX_SYMCOUNT (objfile) = bfd_section_size (sym_bfd, stabsect)
- / DBX_SYMBOL_SIZE (objfile);
- DBX_SYMTAB_OFFSET (objfile) = SYMBOL_TABLE_OFFSET;
-
- /* Read the string table and stash it away in the psymbol_obstack. It is
- only needed as long as we need to expand psymbols into full symbols,
- so when we blow away the psymbol the string table goes away as well.
- Note that gdb used to use the results of attempting to malloc the
- string table, based on the size it read, as a form of sanity check
- for botched byte swapping, on the theory that a byte swapped string
- table size would be so totally bogus that the malloc would fail. Now
- that we put in on the psymbol_obstack, we can't do this since gdb gets
- a fatal error (out of virtual memory) if the size is bogus. We can
- however at least check to see if the size is zero or some negative
- value. */
-
- DBX_STRINGTAB_SIZE (objfile) = bfd_section_size (sym_bfd, stringsect);
-
- if (DBX_SYMCOUNT (objfile) == 0
- || DBX_STRINGTAB_SIZE (objfile) == 0)
- return;
-
- if (DBX_STRINGTAB_SIZE (objfile) <= 0
- || DBX_STRINGTAB_SIZE (objfile) > bfd_get_size (sym_bfd))
- error ("ridiculous string table size (%d bytes).",
- DBX_STRINGTAB_SIZE (objfile));
-
- DBX_STRINGTAB (objfile) =
- (char *) obstack_alloc (&objfile -> psymbol_obstack,
- DBX_STRINGTAB_SIZE (objfile));
-
- /* Now read in the string table in one big gulp. */
-
- val = bfd_seek (sym_bfd, STRING_TABLE_OFFSET, L_SET);
- if (val < 0)
- perror_with_name (name);
- val = bfd_read (DBX_STRINGTAB (objfile), DBX_STRINGTAB_SIZE (objfile), 1,
- sym_bfd);
- if (val == 0)
- error ("End of file reading string table");
- else if (val < 0)
- /* It's possible bfd_read should be setting bfd_error, and we should be
- checking that. But currently it doesn't set bfd_error. */
- perror_with_name (name);
- else if (val != DBX_STRINGTAB_SIZE (objfile))
- error ("Short read reading string table");
-}
-
-/* PA specific parsing routine for section offsets.
-
- Plain and simple for now. */
-
-static struct section_offsets *
-pa_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));
-
- for (i = 0; i < SECT_OFF_MAX; i++)
- ANOFFSET (section_offsets, i) = addr;
-
- return section_offsets;
-}
-\f
-/* Register that we are able to handle SOM object file formats. */
-
-static struct sym_fns pa_sym_fns =
-{
- bfd_target_som_flavour,
- pa_new_init, /* sym_new_init: init anything gbl to entire symtab */
- pa_symfile_init, /* sym_init: read initial info, setup for sym_read() */
- pa_symfile_read, /* sym_read: read a symbol file into symtab */
- pa_symfile_finish, /* sym_finish: finished with file, cleanup */
- pa_symfile_offsets, /* sym_offsets: Translate ext. to int. relocation */
- NULL /* next: pointer to next struct sym_fns */
-};
-
-void
-_initialize_paread ()
-{
- add_symtab_fns (&pa_sym_fns);
-}
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