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/* Definitions to target GDB to GNU/Linux on 386.

   Copyright 1992, 1993 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 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., 59 Temple Place - Suite 330,

   Boston, MA 02111-1307, USA.  */

#ifndef TM_LINUX_H

#define TM_LINUX_H

#define I386_GNULINUX_TARGET

#define HAVE_I387_REGS

#ifdef HAVE_PTRACE_GETXFPREGS

#define HAVE_SSE_REGS

#endif

#include "i386/tm-i386.h"

#include "tm-linux.h"

/* FIXME: kettenis/2000-03-26: We should get rid of this last piece of

   Linux-specific `long double'-support code, probably by adding code

   to valprint.c:print_floating() to recognize various extended

   floating-point formats.  */

#if defined(HAVE_LONG_DOUBLE) && defined(HOST_I386)

/* The host and target are i386 machines and the compiler supports

   long doubles. Long doubles on the host therefore have the same

   layout as a 387 FPU stack register. */

#define TARGET_ANALYZE_FLOATING                                 \

  do                                                            \

    {                                                           \

      unsigned expon;                                           \

                                                                \

      low = extract_unsigned_integer (valaddr, 4);              \

      high = extract_unsigned_integer (valaddr + 4, 4);         \

      expon = extract_unsigned_integer (valaddr + 8, 2);        \

                                                                \

      nonnegative = ((expon & 0x8000) == 0);                     \

      is_nan = ((expon & 0x7fff) == 0x7fff)                     \

        && ((high & 0x80000000) == 0x80000000)                  \

        && (((high & 0x7fffffff) | low) != 0);                   \

    }                                                           \

  while (0)

#endif

/* The following works around a problem with /usr/include/sys/procfs.h  */

#define sys_quotactl 1

/* When the i386 Linux kernel calls a signal handler, the return

   address points to a bit of code on the stack.  These definitions

   are used to identify this bit of code as a signal trampoline in

   order to support backtracing through calls to signal handlers.  */

#define IN_SIGTRAMP(pc, name) i386_linux_in_sigtramp (pc, name)

extern int i386_linux_in_sigtramp (CORE_ADDR, char *);

/* We need our own version of sigtramp_saved_pc to get the saved PC in

   a sigtramp routine.  */

#define sigtramp_saved_pc i386_linux_sigtramp_saved_pc

extern CORE_ADDR i386_linux_sigtramp_saved_pc (struct frame_info *);

/* Signal trampolines don't have a meaningful frame.  As in tm-i386.h,

   the frame pointer value we use is actually the frame pointer of the

   calling frame--that is, the frame which was in progress when the

   signal trampoline was entered.  gdb mostly treats this frame

   pointer value as a magic cookie.  We detect the case of a signal

   trampoline by looking at the SIGNAL_HANDLER_CALLER field, which is

   set based on IN_SIGTRAMP.

   When a signal trampoline is invoked from a frameless function, we

   essentially have two frameless functions in a row.  In this case,

   we use the same magic cookie for three frames in a row.  We detect

   this case by seeing whether the next frame has

   SIGNAL_HANDLER_CALLER set, and, if it does, checking whether the

   current frame is actually frameless.  In this case, we need to get

   the PC by looking at the SP register value stored in the signal

   context.

   This should work in most cases except in horrible situations where

   a signal occurs just as we enter a function but before the frame

   has been set up.  */

#define FRAMELESS_SIGNAL(FRAME)                                 \

  ((FRAME)->next != NULL                                        \

   && (FRAME)->next->signal_handler_caller                      \

   && frameless_look_for_prologue (FRAME))

#undef FRAME_CHAIN

#define FRAME_CHAIN(FRAME)                                      \

  ((FRAME)->signal_handler_caller                               \

   ? (FRAME)->frame                                             \

    : (FRAMELESS_SIGNAL (FRAME)                                 \

       ? (FRAME)->frame                                         \

       : (!inside_entry_file ((FRAME)->pc)                      \

          ? read_memory_integer ((FRAME)->frame, 4)             \

          : 0)))

#undef FRAME_SAVED_PC

#define FRAME_SAVED_PC(FRAME)                                   \

  ((FRAME)->signal_handler_caller                               \

   ? sigtramp_saved_pc (FRAME)                                  \

   : (FRAMELESS_SIGNAL (FRAME)                                  \

      ? read_memory_integer (i386_linux_sigtramp_saved_sp ((FRAME)->next), 4) \

      : read_memory_integer ((FRAME)->frame + 4, 4)))

extern CORE_ADDR i386_linux_sigtramp_saved_sp (struct frame_info *);

#undef SAVED_PC_AFTER_CALL

#define SAVED_PC_AFTER_CALL(frame) i386_linux_saved_pc_after_call (frame)

extern CORE_ADDR i386_linux_saved_pc_after_call (struct frame_info *);

/* When we call a function in a shared library, and the PLT sends us

   into the dynamic linker to find the function's real address, we

   need to skip over the dynamic linker call.  This function decides

   when to skip, and where to skip to.  See the comments for

   SKIP_SOLIB_RESOLVER at the top of infrun.c.  */

#define SKIP_SOLIB_RESOLVER i386_linux_skip_solib_resolver

extern CORE_ADDR i386_linux_skip_solib_resolver (CORE_ADDR pc);

/* N_FUN symbols in shared libaries have 0 for their values and need

   to be relocated. */

#define SOFUN_ADDRESS_MAYBE_MISSING

#endif /* #ifndef TM_LINUX_H */