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42f0bc8eaf
(i386_dicos_frame_align): New. (i386_dicos_init_abi): Register i386_dicos_frame_align. Set call dummy location ON_STACK. * Makefile.in (i386-dicos-tdep.o): Depend on $(inferior_h).
134 lines
3.9 KiB
C
134 lines
3.9 KiB
C
/* Target-dependent code for DICOS running on i386's, for GDB.
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Copyright (C) 2008 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "osabi.h"
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#include "gdb_string.h"
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#include "solib.h"
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#include "solib-target.h"
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#include "inferior.h"
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static CORE_ADDR
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i386_dicos_frame_align (struct gdbarch *gdbarch, CORE_ADDR sp)
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{
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/* Having a call dummy on the stack requires a gdbarch_frame_align
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method to align the breakpoint instruction in the stack.
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Strictly speaking, we could just return SP pristine on x86. But,
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as long as we're providing a frame align method, might as well
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align for efficiency. */
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return sp & -(CORE_ADDR)16;
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}
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static void
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i386_dicos_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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set_solib_ops (gdbarch, &solib_target_so_ops);
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/* There's no (standard definition of) entry point or a guaranteed
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text location we could find with a symbol where to place the call
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dummy, so we put it on the stack. */
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set_gdbarch_call_dummy_location (gdbarch, ON_STACK);
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set_gdbarch_frame_align (gdbarch, i386_dicos_frame_align);
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}
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/* Look in the elf symbol table of ABFD for a symbol named WANTED.
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Return true if found. */
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static int
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i386_dicos_bfd_has_symbol_p (bfd *abfd, const char *wanted)
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{
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long storage_needed;
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int ret = 0;
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asymbol **symbol_table = NULL;
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storage_needed = bfd_get_symtab_upper_bound (abfd);
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if (storage_needed < 0)
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{
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warning (_("Can't read elf symbols from %s: %s"), bfd_get_filename (abfd),
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bfd_errmsg (bfd_get_error ()));
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return 0;
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}
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if (storage_needed > 0)
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{
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long i, symcount;
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symbol_table = xmalloc (storage_needed);
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symcount = bfd_canonicalize_symtab (abfd, symbol_table);
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if (symcount < 0)
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warning (_("Can't read elf symbols from %s: %s"),
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bfd_get_filename (abfd),
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bfd_errmsg (bfd_get_error ()));
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else
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{
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for (i = 0; i < symcount; i++)
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{
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asymbol *sym = symbol_table[i];
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if (sym->name != NULL
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&& wanted[0] == sym->name[0]
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&& strcmp (wanted + 1, sym->name + 1) == 0)
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{
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ret = 1;
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break;
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}
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}
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}
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}
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xfree (symbol_table);
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return ret;
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}
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static enum gdb_osabi
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i386_dicos_osabi_sniffer (bfd *abfd)
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{
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char *target_name = bfd_get_target (abfd);
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/* DICOS debug info files don't have a .note.ABI-tag marker or
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something similar. We do know there's always a "header" section
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of 36 bytes, and there's always a "Dicos_loadModuleInfo" symbol
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defined. Look for the section first, as that should be
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cheaper. */
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if (strcmp (target_name, "elf32-i386") == 0)
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{
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asection *section = bfd_get_section_by_name (abfd, "header");
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if (section
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&& bfd_section_size (abfd, section) == 36
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&& i386_dicos_bfd_has_symbol_p (abfd, "Dicos_loadModuleInfo"))
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return GDB_OSABI_DICOS;
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}
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return GDB_OSABI_UNKNOWN;
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}
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/* Provide a prototype to silence -Wmissing-prototypes. */
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void _initialize_i386_dicos_tdep (void);
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void
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_initialize_i386_dicos_tdep (void)
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{
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gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_elf_flavour,
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i386_dicos_osabi_sniffer);
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gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_DICOS,
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i386_dicos_init_abi);
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}
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