gdb/config/alpha/tm-alphalinux.h

   1 /* Definitions to make GDB run on an Alpha box under Linux.  The
   2    definitions here are used when the _target_ system is running Linux.
   3    Copyright 1996 Free Software Foundation, Inc.
   4
   5 This file is part of GDB.
   6
   7 This program is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2 of the License, or
  10 (at your option) any later version.
  11
  12 This program is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with this program; if not, write to the Free Software
  19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  20
  21 #ifndef TM_LINUXALPHA_H
  22 #define TM_LINUXALPHA_H
  23
  24 #include "alpha/tm-alpha.h"
  25
  26 /* Are we currently handling a signal ?  */
  27
  28 extern long alpha_linux_sigtramp_offset PARAMS ((CORE_ADDR));
  29 #undef IN_SIGTRAMP
  30 #define IN_SIGTRAMP(pc, name)   (alpha_linux_sigtramp_offset (pc) >= 0)
  31
  32 /* Get start and end address of sigtramp handler.  */
  33
  34 #define SIGTRAMP_START(pc)      (pc - alpha_linux_sigtramp_offset (pc))
  35 #define SIGTRAMP_END(pc)        (SIGTRAMP_START(pc) + 3*4)
  36
  37
  38 /* Number of traps that happen between exec'ing the shell to run an
  39    inferior, and when we finally get to the inferior code.  This is 2
  40    on Linux and most implementations.  */
  41
  42 #undef START_INFERIOR_TRAPS_EXPECTED
  43 #define START_INFERIOR_TRAPS_EXPECTED 2
  44
  45 /* Return TRUE if procedure descriptor PROC is a procedure descriptor
  46    that refers to a dynamically generated sigtramp function.  */
  47
  48 #undef PROC_DESC_IS_DYN_SIGTRAMP
  49 #define PROC_SIGTRAMP_MAGIC     0x0e0f0f0f
  50 #define PROC_DESC_IS_DYN_SIGTRAMP(proc) ((proc)->pdr.isym               \
  51                                          == PROC_SIGTRAMP_MAGIC)
  52 #undef SET_PROC_DESC_IS_DYN_SIGTRAMP
  53 #define SET_PROC_DESC_IS_DYN_SIGTRAMP(proc) ((proc)->pdr.isym           \
  54                                              = PROC_SIGTRAMP_MAGIC)
  55
  56 /* If PC is inside a dynamically generated sigtramp function, return
  57    how many bytes the program counter is beyond the start of that
  58    function.  Otherwise, return a negative value.  */
  59
  60 #undef DYNAMIC_SIGTRAMP_OFFSET
  61 #define DYNAMIC_SIGTRAMP_OFFSET(pc)     (alpha_linux_sigtramp_offset (pc))
  62
  63 /* Translate a signal handler frame into the address of the sigcontext
  64    structure.  */
  65
  66 #undef SIGCONTEXT_ADDR
  67 #define SIGCONTEXT_ADDR(frame)                  ((frame)->frame - 0x298)
  68
  69 /* If FRAME refers to a sigtramp frame, return the address of the next frame.
  70
  71    Under Linux, sigtramp handlers have dynamically generated procedure
  72    descriptors that make this hack unnecessary.  */
  73
  74 #undef FRAME_PAST_SIGTRAMP_FRAME
  75 #define FRAME_PAST_SIGTRAMP_FRAME(frame, pc)    (0)
  76
  77 /* We need this for the SOLIB_TRAMPOLINE stuff.  */
  78 #include "tm-sysv4.h"
  79
  80 #endif /* TM_LINUXALPHA_H */