Fix buffer overrun parsing a corrupt tekhex binary.

[thirdparty/binutils-gdb.git] / gdb / amd64-sol2-tdep.c

/* Target-dependent code for AMD64 Solaris.

   Copyright (C) 2001-2017 Free Software Foundation, Inc.

   Contributed by Joseph Myers, CodeSourcery, LLC.

   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 "frame.h"
#include "gdbcore.h"
#include "regcache.h"
#include "osabi.h"
#include "symtab.h"

#include "sol2-tdep.h"
#include "amd64-tdep.h"
#include "solib-svr4.h"

/* Mapping between the general-purpose registers in gregset_t format
   and GDB's register cache layout.  */

/* From <sys/regset.h>.  */
static int amd64_sol2_gregset_reg_offset[] = {
  14 * 8,			/* %rax */
  11 * 8,			/* %rbx */
  13 * 8,			/* %rcx */
  12 * 8,			/* %rdx */
  9 * 8,			/* %rsi */
  8 * 8,			/* %rdi */
  10 * 8,			/* %rbp */
  20 * 8,			/* %rsp */
  7 * 8,			/* %r8 ...  */
  6 * 8,
  5 * 8,
  4 * 8,
  3 * 8,
  2 * 8,
  1 * 8,
  0 * 8,			/* ... %r15 */
  17 * 8,			/* %rip */
  19 * 8,			/* %eflags */
  18 * 8,			/* %cs */
  21 * 8,			/* %ss */
  25 * 8,			/* %ds */
  24 * 8,			/* %es */
  22 * 8,			/* %fs */
  23 * 8			/* %gs */
};
\f

/* Return whether THIS_FRAME corresponds to a Solaris sigtramp
   routine.  */

static int
amd64_sol2_sigtramp_p (struct frame_info *this_frame)
{
  CORE_ADDR pc = get_frame_pc (this_frame);
  const char *name;

  find_pc_partial_function (pc, &name, NULL, NULL);
  return (name && (strcmp ("sigacthandler", name) == 0
		   || strcmp (name, "ucbsigvechandler") == 0));
}

/* Solaris doesn't have a 'struct sigcontext', but it does have a
   'mcontext_t' that contains the saved set of machine registers.  */

static CORE_ADDR
amd64_sol2_mcontext_addr (struct frame_info *this_frame)
{
  CORE_ADDR sp, ucontext_addr;

  sp = get_frame_register_unsigned (this_frame, AMD64_RSP_REGNUM);
  ucontext_addr = get_frame_memory_unsigned (this_frame, sp + 8, 8);

  return ucontext_addr + 72;
}

static void
amd64_sol2_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

  tdep->gregset_reg_offset = amd64_sol2_gregset_reg_offset;
  tdep->gregset_num_regs = ARRAY_SIZE (amd64_sol2_gregset_reg_offset);
  tdep->sizeof_gregset = 28 * 8;

  amd64_init_abi (info, gdbarch, tdesc_amd64);

  tdep->sigtramp_p = amd64_sol2_sigtramp_p;
  tdep->sigcontext_addr = amd64_sol2_mcontext_addr;
  tdep->sc_reg_offset = tdep->gregset_reg_offset;
  tdep->sc_num_regs = tdep->gregset_num_regs;

  /* Solaris uses SVR4-style shared libraries.  */
  set_gdbarch_skip_solib_resolver (gdbarch, sol2_skip_solib_resolver);
  set_solib_svr4_fetch_link_map_offsets
    (gdbarch, svr4_lp64_fetch_link_map_offsets);

  /* How to print LWP PTIDs from core files.  */
  set_gdbarch_core_pid_to_str (gdbarch, sol2_core_pid_to_str);
}
\f

/* Provide a prototype to silence -Wmissing-prototypes.  */
extern void _initialize_amd64_sol2_tdep (void);

void
_initialize_amd64_sol2_tdep (void)
{
  gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64,
			  GDB_OSABI_SOLARIS, amd64_sol2_init_abi);
}