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/* Target-dependent, architecture-independent code for DICOS, for GDB.
Copyright (C) 2009-2023 Free Software Foundation, Inc.
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 "osabi.h"
#include "solib.h"
#include "solib-target.h"
#include "inferior.h"
#include "dicos-tdep.h"
#include "gdbarch.h"
void
dicos_init_abi (struct gdbarch *gdbarch)
{
set_gdbarch_so_ops (gdbarch, &solib_target_so_ops);
/* Every process, although has its own address space, sees the same
list of shared libraries. There's no "main executable" in DICOS,
so this accounts for all code. */
set_gdbarch_has_global_solist (gdbarch, 1);
/* The DICOS breakpoint API takes care of magically making
breakpoints visible to all inferiors. */
set_gdbarch_has_global_breakpoints (gdbarch, 1);
/* There's no (standard definition of) entry point or a guaranteed
text location with a symbol where to place the call dummy, so we
need it on the stack. Rely on i386_gdbarch_init used also for
amd64 to set up ON_STACK inferior calls. */
/* DICOS rewinds the PC itself. */
set_gdbarch_decr_pc_after_break (gdbarch, 0);
}
/* Return true if ABFD is a dicos load module. HEADER_SIZE is the
expected size of the "header" section in bytes. */
int
dicos_load_module_p (bfd *abfd, int header_size)
{
long storage_needed;
int ret = 0;
asymbol **symbol_table = NULL;
const char *symname = "Dicos_loadModuleInfo";
asection *section;
/* DICOS files don't have a .note.ABI-tag marker or something
similar. We do know there's always a "header" section of
HEADER_SIZE bytes (size depends on architecture), and there's
always a "Dicos_loadModuleInfo" symbol defined. Look for the
section first, as that should be cheaper. */
section = bfd_get_section_by_name (abfd, "header");
if (!section)
return 0;
if (bfd_section_size (section) != header_size)
return 0;
/* Dicos LMs always have a "Dicos_loadModuleInfo" symbol
defined. Look for it. */
storage_needed = bfd_get_symtab_upper_bound (abfd);
if (storage_needed < 0)
{
warning (_("Can't read elf symbols from %s: %s"),
bfd_get_filename (abfd),
bfd_errmsg (bfd_get_error ()));
return 0;
}
if (storage_needed > 0)
{
long i, symcount;
symbol_table = (asymbol **) xmalloc (storage_needed);
symcount = bfd_canonicalize_symtab (abfd, symbol_table);
if (symcount < 0)
warning (_("Can't read elf symbols from %s: %s"),
bfd_get_filename (abfd),
bfd_errmsg (bfd_get_error ()));
else
{
for (i = 0; i < symcount; i++)
{
asymbol *sym = symbol_table[i];
if (sym->name != NULL
&& symname[0] == sym->name[0]
&& strcmp (symname + 1, sym->name + 1) == 0)
{
ret = 1;
break;
}
}
}
}
xfree (symbol_table);
return ret;
}
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