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[/] [or1k/] [trunk/] [gdb-5.0/] [gdb/] [config/] [i386/] [tm-linux.h] - Blame information for rev 1765

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1 106 markom
/* Definitions to target GDB to GNU/Linux on 386.
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   Copyright 1992, 1993 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 2 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, write to the Free Software
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   Foundation, Inc., 59 Temple Place - Suite 330,
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   Boston, MA 02111-1307, USA.  */
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#ifndef TM_LINUX_H
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#define TM_LINUX_H
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#define I386_GNULINUX_TARGET
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#define HAVE_I387_REGS
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#ifdef HAVE_PTRACE_GETXFPREGS
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#define HAVE_SSE_REGS
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#endif
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#include "i386/tm-i386.h"
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#include "tm-linux.h"
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/* FIXME: kettenis/2000-03-26: We should get rid of this last piece of
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   Linux-specific `long double'-support code, probably by adding code
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   to valprint.c:print_floating() to recognize various extended
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   floating-point formats.  */
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#if defined(HAVE_LONG_DOUBLE) && defined(HOST_I386)
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/* The host and target are i386 machines and the compiler supports
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   long doubles. Long doubles on the host therefore have the same
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   layout as a 387 FPU stack register. */
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#define TARGET_ANALYZE_FLOATING                                 \
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  do                                                            \
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    {                                                           \
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      unsigned expon;                                           \
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                                                                \
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      low = extract_unsigned_integer (valaddr, 4);              \
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      high = extract_unsigned_integer (valaddr + 4, 4);         \
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      expon = extract_unsigned_integer (valaddr + 8, 2);        \
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                                                                \
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      nonnegative = ((expon & 0x8000) == 0);                     \
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      is_nan = ((expon & 0x7fff) == 0x7fff)                     \
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        && ((high & 0x80000000) == 0x80000000)                  \
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        && (((high & 0x7fffffff) | low) != 0);                   \
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    }                                                           \
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  while (0)
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#endif
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/* The following works around a problem with /usr/include/sys/procfs.h  */
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#define sys_quotactl 1
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/* When the i386 Linux kernel calls a signal handler, the return
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   address points to a bit of code on the stack.  These definitions
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   are used to identify this bit of code as a signal trampoline in
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   order to support backtracing through calls to signal handlers.  */
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#define IN_SIGTRAMP(pc, name) i386_linux_in_sigtramp (pc, name)
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extern int i386_linux_in_sigtramp (CORE_ADDR, char *);
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/* We need our own version of sigtramp_saved_pc to get the saved PC in
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   a sigtramp routine.  */
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#define sigtramp_saved_pc i386_linux_sigtramp_saved_pc
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extern CORE_ADDR i386_linux_sigtramp_saved_pc (struct frame_info *);
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/* Signal trampolines don't have a meaningful frame.  As in tm-i386.h,
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   the frame pointer value we use is actually the frame pointer of the
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   calling frame--that is, the frame which was in progress when the
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   signal trampoline was entered.  gdb mostly treats this frame
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   pointer value as a magic cookie.  We detect the case of a signal
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   trampoline by looking at the SIGNAL_HANDLER_CALLER field, which is
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   set based on IN_SIGTRAMP.
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   When a signal trampoline is invoked from a frameless function, we
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   essentially have two frameless functions in a row.  In this case,
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   we use the same magic cookie for three frames in a row.  We detect
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   this case by seeing whether the next frame has
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   SIGNAL_HANDLER_CALLER set, and, if it does, checking whether the
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   current frame is actually frameless.  In this case, we need to get
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   the PC by looking at the SP register value stored in the signal
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   context.
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   This should work in most cases except in horrible situations where
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   a signal occurs just as we enter a function but before the frame
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   has been set up.  */
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#define FRAMELESS_SIGNAL(FRAME)                                 \
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  ((FRAME)->next != NULL                                        \
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   && (FRAME)->next->signal_handler_caller                      \
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   && frameless_look_for_prologue (FRAME))
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#undef FRAME_CHAIN
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#define FRAME_CHAIN(FRAME)                                      \
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  ((FRAME)->signal_handler_caller                               \
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   ? (FRAME)->frame                                             \
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    : (FRAMELESS_SIGNAL (FRAME)                                 \
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       ? (FRAME)->frame                                         \
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       : (!inside_entry_file ((FRAME)->pc)                      \
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          ? read_memory_integer ((FRAME)->frame, 4)             \
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          : 0)))
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#undef FRAME_SAVED_PC
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#define FRAME_SAVED_PC(FRAME)                                   \
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  ((FRAME)->signal_handler_caller                               \
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   ? sigtramp_saved_pc (FRAME)                                  \
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   : (FRAMELESS_SIGNAL (FRAME)                                  \
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      ? read_memory_integer (i386_linux_sigtramp_saved_sp ((FRAME)->next), 4) \
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      : read_memory_integer ((FRAME)->frame + 4, 4)))
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extern CORE_ADDR i386_linux_sigtramp_saved_sp (struct frame_info *);
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#undef SAVED_PC_AFTER_CALL
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#define SAVED_PC_AFTER_CALL(frame) i386_linux_saved_pc_after_call (frame)
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extern CORE_ADDR i386_linux_saved_pc_after_call (struct frame_info *);
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/* When we call a function in a shared library, and the PLT sends us
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   into the dynamic linker to find the function's real address, we
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   need to skip over the dynamic linker call.  This function decides
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   when to skip, and where to skip to.  See the comments for
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   SKIP_SOLIB_RESOLVER at the top of infrun.c.  */
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#define SKIP_SOLIB_RESOLVER i386_linux_skip_solib_resolver
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extern CORE_ADDR i386_linux_skip_solib_resolver (CORE_ADDR pc);
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/* N_FUN symbols in shared libaries have 0 for their values and need
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   to be relocated. */
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#define SOFUN_ADDRESS_MAYBE_MISSING
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#endif /* #ifndef TM_LINUX_H */

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