/* Read a symbol table in MIPS' format (Third-Eye).
- Copyright 1986, 1987, 1989, 1990, 1991, 1992, 1993 Free Software
- Foundation, Inc.
+
+ Copyright (C) 1986-2020 Free Software Foundation, Inc.
+
Contributed by Alessandro Forin (af@cs.cmu.edu) at CMU. Major work
by Per Bothner, John Gilmore and Ian Lance Taylor at Cygnus Support.
-This file is part of GDB.
+ 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 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.
+ 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. */
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* Read symbols from an ECOFF file. Most of the work is done in
mdebugread.c. */
#include "defs.h"
+#include "bfd.h"
#include "symtab.h"
-#include "symfile.h"
#include "objfiles.h"
-#include "buildsym.h"
#include "stabsread.h"
-#include "gdb-stabs.h"
+#include "mdebugread.h"
+#include "coff/sym.h"
#include "coff/internal.h"
#include "coff/ecoff.h"
#include "libcoff.h" /* Private BFD COFF information. */
#include "libecoff.h" /* Private BFD ECOFF information. */
+#include "elf/common.h"
+#include "elf/internal.h"
+#include "elf/mips.h"
-static void
-mipscoff_new_init PARAMS ((struct objfile *));
-
-static void
-mipscoff_symfile_init PARAMS ((struct objfile *));
-
-static void
-mipscoff_symfile_read PARAMS ((struct objfile *, struct section_offsets *,
- int));
+#include "psymtab.h"
static void
-mipscoff_symfile_finish PARAMS ((struct objfile *));
-
-static struct section_offsets *
-mipscoff_symfile_offsets PARAMS ((struct objfile *, CORE_ADDR));
+read_alphacoff_dynamic_symtab (minimal_symbol_reader &,
+ struct section_offsets *,
+ struct objfile *objfile);
/* 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). */
-extern CORE_ADDR sigtramp_address;
-
static void
-mipscoff_new_init (ignore)
- struct objfile *ignore;
+mipscoff_new_init (struct objfile *ignore)
{
- sigtramp_address = 0;
stabsread_new_init ();
- buildsym_new_init ();
}
/* Initialize to read a symbol file (nothing to do). */
static void
-mipscoff_symfile_init (objfile)
- struct objfile *objfile;
+mipscoff_symfile_init (struct objfile *objfile)
{
}
/* Read a symbol file from a file. */
static void
-mipscoff_symfile_read (objfile, section_offsets, mainline)
- struct objfile *objfile;
- struct section_offsets *section_offsets;
- int mainline;
+mipscoff_symfile_read (struct objfile *objfile, symfile_add_flags symfile_flags)
{
bfd *abfd = objfile->obfd;
- struct cleanup * back_to;
- init_minimal_symbol_collection ();
- back_to = make_cleanup (discard_minimal_symbols, 0);
+ minimal_symbol_reader reader (objfile);
/* Now that the executable file is positioned at symbol table,
process it and define symbols accordingly. */
- if (ecoff_slurp_symbolic_info (abfd) == false)
- error ("Error reading symbol table: %s", bfd_errmsg (bfd_error));
+ if (!((*ecoff_backend (abfd)->debug_swap.read_debug_info)
+ (abfd, NULL, &ecoff_data (abfd)->debug_info)))
+ error (_("Error reading symbol table: %s"), bfd_errmsg (bfd_get_error ()));
- mdebug_build_psymtabs (objfile, &ecoff_backend (abfd)->debug_swap,
- &ecoff_data (abfd)->debug_info, section_offsets);
+ mdebug_build_psymtabs (reader, objfile, &ecoff_backend (abfd)->debug_swap,
+ &ecoff_data (abfd)->debug_info);
- /* Install any minimal symbols that have been collected as the current
- minimal symbols for this objfile. */
+ /* Add alpha coff dynamic symbols. */
- install_minimal_symbols (objfile);
+ read_alphacoff_dynamic_symtab (reader, objfile->section_offsets, objfile);
- do_cleanups (back_to);
+ /* Install any minimal symbols that have been collected as the current
+ minimal symbols for this objfile. */
+
+ reader.install ();
}
/* Perform any local cleanups required when we are done with a
particular objfile. */
static void
-mipscoff_symfile_finish (objfile)
- struct objfile *objfile;
+mipscoff_symfile_finish (struct objfile *objfile)
{
}
-/* Fake up identical offsets for all sections. */
+/* Alpha OSF/1 encapsulates the dynamic symbols in ELF format in a
+ standard COFF section. The ELF format for the symbols differs from
+ the format defined in elf/external.h. It seems that a normal ELF
+ 32-bit format is used, and the representation only changes because
+ longs are 64-bit on the alpha. In addition, the handling of
+ text/data section indices for symbols is different from the ELF
+ ABI. As the BFD linker currently does not support dynamic linking
+ on the alpha, there seems to be no reason to pollute BFD with
+ another mixture of object file formats for now. */
+
+/* Format of an alpha external ELF symbol. */
-static struct section_offsets *
-mipscoff_symfile_offsets (objfile, addr)
- struct objfile *objfile;
- CORE_ADDR addr;
+typedef struct
{
- struct section_offsets *section_offsets;
- int i;
+ unsigned char st_name[4]; /* Symbol name, index in string table. */
+ unsigned char st_pad[4]; /* Pad to long word boundary. */
+ unsigned char st_value[8]; /* Value of the symbol. */
+ unsigned char st_size[4]; /* Associated symbol size. */
+ unsigned char st_info[1]; /* Type and binding attributes. */
+ unsigned char st_other[1]; /* No defined meaning, 0. */
+ unsigned char st_shndx[2]; /* Associated section index. */
+} Elfalpha_External_Sym;
+
+/* Format of an alpha external ELF dynamic info structure. */
+
+typedef struct
+{
+ unsigned char d_tag[4]; /* Tag. */
+ unsigned char d_pad[4]; /* Pad to long word boundary. */
+ union
+ {
+ unsigned char d_ptr[8]; /* Pointer value. */
+ unsigned char d_val[4]; /* Integer value. */
+ }
+ d_un;
+} Elfalpha_External_Dyn;
+
+/* Struct to obtain the section pointers for alpha dynamic symbol info. */
+
+struct alphacoff_dynsecinfo
+{
+ asection *sym_sect; /* Section pointer for .dynsym section. */
+ asection *str_sect; /* Section pointer for .dynstr section. */
+ asection *dyninfo_sect; /* Section pointer for .dynamic section. */
+ asection *got_sect; /* Section pointer for .got section. */
+};
+
+/* We are called once per section from read_alphacoff_dynamic_symtab.
+ We need to examine each section we are passed, check to see if it
+ is something we are interested in processing, and if so, stash away
+ some access information for the section. */
- 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)))));
+static void
+alphacoff_locate_sections (bfd *ignore_abfd, asection *sectp, void *sip)
+{
+ struct alphacoff_dynsecinfo *si;
+
+ si = (struct alphacoff_dynsecinfo *) sip;
+
+ if (strcmp (sectp->name, ".dynsym") == 0)
+ si->sym_sect = sectp;
+ else if (strcmp (sectp->name, ".dynstr") == 0)
+ si->str_sect = sectp;
+ else if (strcmp (sectp->name, ".dynamic") == 0)
+ si->dyninfo_sect = sectp;
+ else if (strcmp (sectp->name, ".got") == 0)
+ si->got_sect = sectp;
+}
- for (i = 0; i < SECT_OFF_MAX; i++)
- ANOFFSET (section_offsets, i) = addr;
+/* Scan an alpha dynamic symbol table for symbols of interest and add
+ them to the minimal symbol table. */
- return section_offsets;
+static void
+read_alphacoff_dynamic_symtab (minimal_symbol_reader &reader,
+ struct section_offsets *section_offsets,
+ struct objfile *objfile)
+{
+ bfd *abfd = objfile->obfd;
+ struct alphacoff_dynsecinfo si;
+ int sym_count;
+ int i;
+ int stripped;
+ Elfalpha_External_Sym *x_symp;
+ gdb_byte *dyninfo_p;
+ gdb_byte *dyninfo_end;
+ int got_entry_size = 8;
+ int dt_mips_local_gotno = -1;
+ int dt_mips_gotsym = -1;
+
+ /* We currently only know how to handle alpha dynamic symbols. */
+ if (bfd_get_arch (abfd) != bfd_arch_alpha)
+ return;
+
+ /* Locate the dynamic symbols sections and read them in. */
+ memset ((char *) &si, 0, sizeof (si));
+ bfd_map_over_sections (abfd, alphacoff_locate_sections, (void *) & si);
+ if (si.sym_sect == NULL || si.str_sect == NULL
+ || si.dyninfo_sect == NULL || si.got_sect == NULL)
+ return;
+
+ gdb::byte_vector sym_sec (bfd_section_size (si.sym_sect));
+ gdb::byte_vector str_sec (bfd_section_size (si.str_sect));
+ gdb::byte_vector dyninfo_sec (bfd_section_size (si.dyninfo_sect));
+ gdb::byte_vector got_sec (bfd_section_size (si.got_sect));
+
+ if (!bfd_get_section_contents (abfd, si.sym_sect, sym_sec.data (),
+ (file_ptr) 0, sym_sec.size ()))
+ return;
+ if (!bfd_get_section_contents (abfd, si.str_sect, str_sec.data (),
+ (file_ptr) 0, str_sec.size ()))
+ return;
+ if (!bfd_get_section_contents (abfd, si.dyninfo_sect, dyninfo_sec.data (),
+ (file_ptr) 0, dyninfo_sec.size ()))
+ return;
+ if (!bfd_get_section_contents (abfd, si.got_sect, got_sec.data (),
+ (file_ptr) 0, got_sec.size ()))
+ return;
+
+ /* Find the number of local GOT entries and the index for the
+ first dynamic symbol in the GOT. */
+ for ((dyninfo_p = dyninfo_sec.data (),
+ dyninfo_end = dyninfo_p + dyninfo_sec.size ());
+ dyninfo_p < dyninfo_end;
+ dyninfo_p += sizeof (Elfalpha_External_Dyn))
+ {
+ Elfalpha_External_Dyn *x_dynp = (Elfalpha_External_Dyn *) dyninfo_p;
+ long dyn_tag;
+
+ dyn_tag = bfd_h_get_32 (abfd, (bfd_byte *) x_dynp->d_tag);
+ if (dyn_tag == DT_NULL)
+ break;
+ else if (dyn_tag == DT_MIPS_LOCAL_GOTNO)
+ {
+ if (dt_mips_local_gotno < 0)
+ dt_mips_local_gotno
+ = bfd_h_get_32 (abfd, (bfd_byte *) x_dynp->d_un.d_val);
+ }
+ else if (dyn_tag == DT_MIPS_GOTSYM)
+ {
+ if (dt_mips_gotsym < 0)
+ dt_mips_gotsym
+ = bfd_h_get_32 (abfd, (bfd_byte *) x_dynp->d_un.d_val);
+ }
+ }
+ if (dt_mips_local_gotno < 0 || dt_mips_gotsym < 0)
+ return;
+
+ /* Scan all dynamic symbols and enter them into the minimal symbol
+ table if appropriate. */
+ sym_count = sym_sec.size () / sizeof (Elfalpha_External_Sym);
+ stripped = (bfd_get_symcount (abfd) == 0);
+
+ /* Skip first symbol, which is a null dummy. */
+ for (i = 1, x_symp = (Elfalpha_External_Sym *) sym_sec.data () + 1;
+ i < sym_count;
+ i++, x_symp++)
+ {
+ unsigned long strx;
+ char *name;
+ bfd_vma sym_value;
+ unsigned char sym_info;
+ unsigned int sym_shndx;
+ int isglobal;
+ enum minimal_symbol_type ms_type;
+
+ strx = bfd_h_get_32 (abfd, (bfd_byte *) x_symp->st_name);
+ if (strx >= str_sec.size ())
+ continue;
+ name = (char *) (str_sec.data () + strx);
+ if (*name == '\0' || *name == '.')
+ continue;
+
+ sym_value = bfd_h_get_64 (abfd, (bfd_byte *) x_symp->st_value);
+ sym_info = bfd_h_get_8 (abfd, (bfd_byte *) x_symp->st_info);
+ sym_shndx = bfd_h_get_16 (abfd, (bfd_byte *) x_symp->st_shndx);
+ if (sym_shndx >= (SHN_LORESERVE & 0xffff))
+ sym_shndx += SHN_LORESERVE - (SHN_LORESERVE & 0xffff);
+ isglobal = (ELF_ST_BIND (sym_info) == STB_GLOBAL);
+
+ if (sym_shndx == SHN_UNDEF)
+ {
+ /* Handle undefined functions which are defined in a shared
+ library. */
+ if (ELF_ST_TYPE (sym_info) != STT_FUNC
+ || ELF_ST_BIND (sym_info) != STB_GLOBAL)
+ continue;
+
+ ms_type = mst_solib_trampoline;
+
+ /* If sym_value is nonzero, it points to the shared library
+ trampoline entry, which is what we are looking for.
+
+ If sym_value is zero, then we have to get the GOT entry
+ for the symbol.
+
+ If the GOT entry is nonzero, it represents the quickstart
+ address of the function and we use that as the symbol
+ value.
+
+ If the GOT entry is zero, the function address has to be
+ resolved by the runtime loader before the executable is
+ started. We are unable to find any meaningful address
+ for these functions in the executable file, so we skip
+ them. */
+ if (sym_value == 0)
+ {
+ int got_entry_offset =
+ (i - dt_mips_gotsym + dt_mips_local_gotno) * got_entry_size;
+
+ if (got_entry_offset < 0
+ || got_entry_offset >= got_sec.size ())
+ continue;
+ sym_value =
+ bfd_h_get_64 (abfd,
+ (bfd_byte *) (got_sec.data ()
+ + got_entry_offset));
+ if (sym_value == 0)
+ continue;
+ }
+ }
+ else
+ {
+ /* Symbols defined in the executable itself. We only care
+ about them if this is a stripped executable, otherwise
+ they have been retrieved from the normal symbol table
+ already. */
+ if (!stripped)
+ continue;
+
+ if (sym_shndx == SHN_MIPS_TEXT)
+ {
+ if (isglobal)
+ ms_type = mst_text;
+ else
+ ms_type = mst_file_text;
+ }
+ else if (sym_shndx == SHN_MIPS_DATA)
+ {
+ if (isglobal)
+ ms_type = mst_data;
+ else
+ ms_type = mst_file_data;
+ }
+ else if (sym_shndx == SHN_MIPS_ACOMMON)
+ {
+ if (isglobal)
+ ms_type = mst_bss;
+ else
+ ms_type = mst_file_bss;
+ }
+ else if (sym_shndx == SHN_ABS)
+ {
+ ms_type = mst_abs;
+ }
+ else
+ {
+ continue;
+ }
+ }
+
+ reader.record (name, sym_value, ms_type);
+ }
}
-/* Initialization */
+/* Initialization. */
-static struct sym_fns ecoff_sym_fns =
+static const struct sym_fns ecoff_sym_fns =
{
- bfd_target_ecoff_flavour,
- mipscoff_new_init, /* sym_new_init: init anything gbl to entire symtab */
- mipscoff_symfile_init, /* sym_init: read initial info, setup for sym_read() */
- mipscoff_symfile_read, /* sym_read: read a symbol file into symtab */
- mipscoff_symfile_finish, /* sym_finish: finished with file, cleanup */
- mipscoff_symfile_offsets, /* sym_offsets: dummy FIXME til implem sym reloc */
- NULL /* next: pointer to next struct sym_fns */
+ mipscoff_new_init, /* init anything gbl to entire symtab */
+ mipscoff_symfile_init, /* read initial info, setup for sym_read() */
+ mipscoff_symfile_read, /* read a symbol file into symtab */
+ NULL, /* sym_read_psymbols */
+ mipscoff_symfile_finish, /* finished with file, cleanup */
+ default_symfile_offsets, /* dummy FIXME til implem sym reloc */
+ default_symfile_segments, /* Get segment information from a file. */
+ NULL,
+ default_symfile_relocate, /* Relocate a debug section. */
+ NULL, /* sym_probe_fns */
+ &psym_functions
};
void
-_initialize_mipsread ()
+_initialize_mipsread (void)
{
- add_symtab_fns (&ecoff_sym_fns);
+ add_symtab_fns (bfd_target_ecoff_flavour, &ecoff_sym_fns);
}
projects / deliverable / binutils-gdb.git / blobdiff