gdb/config/alpha/tm-alphalinux.h

   1 /* Definitions to make GDB run on an Alpha box under GNU/Linux.  The
   2    definitions here are used when the _target_ system is running
   3    GNU/Linux.
   4
   5    Copyright 1996, 1998, 1999, 2000, 2002 Free Software Foundation,
   6    Inc.
   7
   8    This file is part of GDB.
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 2 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program; if not, write to the Free Software
  22    Foundation, Inc., 59 Temple Place - Suite 330,
  23    Boston, MA 02111-1307, USA.  */
  24
  25 #ifndef TM_LINUXALPHA_H
  26 #define TM_LINUXALPHA_H
  27
  28 #include "alpha/tm-alpha.h"
  29
  30 /* Are we currently handling a signal ?  */
  31
  32 extern long alpha_linux_sigtramp_offset (CORE_ADDR);
  33 #undef IN_SIGTRAMP
  34 #define IN_SIGTRAMP(pc, name)   (alpha_linux_sigtramp_offset (pc) >= 0)
  35
  36 /* Get start and end address of sigtramp handler.  */
  37
  38 #define SIGTRAMP_START(pc)      (pc - alpha_linux_sigtramp_offset (pc))
  39 #define SIGTRAMP_END(pc)        (SIGTRAMP_START(pc) + 3*4)
  40
  41
  42 /* Number of traps that happen between exec'ing the shell to run an
  43    inferior, and when we finally get to the inferior code.  This is 2
  44    on GNU/Linux and most implementations.  */
  45
  46 #undef START_INFERIOR_TRAPS_EXPECTED
  47 #define START_INFERIOR_TRAPS_EXPECTED 2
  48
  49 /* Return TRUE if procedure descriptor PROC is a procedure descriptor
  50    that refers to a dynamically generated sigtramp function.  */
  51
  52 #undef PROC_DESC_IS_DYN_SIGTRAMP
  53 #define PROC_SIGTRAMP_MAGIC     0x0e0f0f0f
  54 #define PROC_DESC_IS_DYN_SIGTRAMP(proc) ((proc)->pdr.isym               \
  55                                          == PROC_SIGTRAMP_MAGIC)
  56 #undef SET_PROC_DESC_IS_DYN_SIGTRAMP
  57 #define SET_PROC_DESC_IS_DYN_SIGTRAMP(proc) ((proc)->pdr.isym           \
  58                                              = PROC_SIGTRAMP_MAGIC)
  59
  60 /* If PC is inside a dynamically generated sigtramp function, return
  61    how many bytes the program counter is beyond the start of that
  62    function.  Otherwise, return a negative value.  */
  63
  64 #undef DYNAMIC_SIGTRAMP_OFFSET
  65 #define DYNAMIC_SIGTRAMP_OFFSET(pc)     (alpha_linux_sigtramp_offset (pc))
  66
  67 /* Translate a signal handler frame into the address of the sigcontext
  68    structure.  */
  69
  70 #undef SIGCONTEXT_ADDR
  71 #define SIGCONTEXT_ADDR(frame)                  ((frame)->frame - 0x298)
  72
  73 /* If FRAME refers to a sigtramp frame, return the address of the next frame.
  74
  75    Under GNU/Linux, sigtramp handlers have dynamically generated
  76    procedure descriptors that make this hack unnecessary.  */
  77
  78 #undef FRAME_PAST_SIGTRAMP_FRAME
  79 #define FRAME_PAST_SIGTRAMP_FRAME(frame, pc)    (0)
  80
  81 #include "tm-linux.h"
  82
  83 #endif /* TM_LINUXALPHA_H */