gdb/config/m68k/tm-linux.h

   1 /* Definitions to target GDB to Linux on m680x0
   2    Copyright (C) 1996,1998 Free Software Foundation, Inc.
   3
   4    This file is part of GDB.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 /* Number of traps that happen between exec'ing the shell to run an
  22    inferior, and when we finally get to the inferior code.  This is 2
  23    on most implementations.  */
  24
  25 #define START_INFERIOR_TRAPS_EXPECTED 2
  26
  27 /* The following definitions are appropriate when using the ELF
  28    format, where floating point values are returned in fp0, pointer
  29    values in a0 and other values in d0.  */
  30
  31 /* Extract from an array REGBUF containing the (raw) register state a
  32    function return value of type TYPE, and copy that, in virtual
  33    format, into VALBUF.  */
  34
  35 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
  36 {                                                                       \
  37   if (TYPE_CODE (TYPE) == TYPE_CODE_FLT)                                \
  38     {                                                                   \
  39        REGISTER_CONVERT_TO_VIRTUAL (FP0_REGNUM, TYPE,                   \
  40                                     ((char *) (REGBUF)                  \
  41                                      + REGISTER_BYTE (FP0_REGNUM)),     \
  42                                     VALBUF);                            \
  43     }                                                                   \
  44   else if (TYPE_CODE (TYPE) == TYPE_CODE_PTR)                           \
  45     memcpy (VALBUF, (char *) (REGBUF) + REGISTER_BYTE (A0_REGNUM),      \
  46             TYPE_LENGTH (TYPE));                                        \
  47   else                                                                  \
  48     memcpy (VALBUF,                                                     \
  49             ((char *) (REGBUF)                                          \
  50              + (TYPE_LENGTH (TYPE) >= 4 ? 0 : 4 - TYPE_LENGTH (TYPE))), \
  51             TYPE_LENGTH (TYPE));                                        \
  52 }
  53
  54 /* Write into appropriate registers a function return value of type
  55    TYPE, given in virtual format.  */
  56
  57 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
  58 {                                                                       \
  59   if (TYPE_CODE (TYPE) == TYPE_CODE_FLT)                                \
  60     {                                                                   \
  61       char raw_buffer[REGISTER_RAW_SIZE (FP0_REGNUM)];                  \
  62       REGISTER_CONVERT_TO_RAW (TYPE, FP0_REGNUM, VALBUF, raw_buffer);   \
  63       write_register_bytes (REGISTER_BYTE (FP0_REGNUM),                 \
  64                             raw_buffer, TYPE_LENGTH (TYPE));            \
  65     }                                                                   \
  66   else                                                                  \
  67     {                                                                   \
  68       if (TYPE_CODE (TYPE) == TYPE_CODE_PTR)                            \
  69         write_register_bytes (REGISTER_BYTE (A0_REGNUM), VALBUF,        \
  70                               TYPE_LENGTH (TYPE));                      \
  71       write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE));             \
  72     }                                                                   \
  73 }
  74
  75 #include "tm-sysv4.h"
  76 #include "m68k/tm-m68k.h"
  77
  78 /* Extract from an array REGBUF containing the (raw) register state
  79    the address in which a function should return its structure value,
  80    as a CORE_ADDR (or an expression that can be used as one).  */
  81
  82 #undef EXTRACT_STRUCT_VALUE_ADDRESS
  83 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) \
  84   (*(CORE_ADDR *)((char *) (REGBUF) + REGISTER_BYTE (A0_REGNUM)))
  85
  86 /* Offsets (in target ints) into jmp_buf.  */
  87
  88 #define JB_ELEMENT_SIZE 4
  89 #define JB_PC 7
  90
  91 /* Figure out where the longjmp will land.  Slurp the args out of the stack.
  92    We expect the first arg to be a pointer to the jmp_buf structure from which
  93    we extract the pc (JB_PC) that we will land at.  The pc is copied into ADDR.
  94    This routine returns true on success */
  95
  96 #define GET_LONGJMP_TARGET(ADDR) get_longjmp_target(ADDR)
  97
  98 /* Offset to saved PC in sigcontext, from <asm/sigcontext.h>.  */
  99 #define SIGCONTEXT_PC_OFFSET 26
 100
 101 #undef FRAME_SAVED_PC
 102 #define FRAME_SAVED_PC(FRAME) \
 103   (((FRAME)->signal_handler_caller \
 104     ? sigtramp_saved_pc (FRAME) \
 105     : read_memory_integer ((FRAME)->frame + 4, 4)))
 106
 107 extern CORE_ADDR sigtramp_saved_pc PARAMS ((struct frame_info *));
 108
 109 #define IN_SIGTRAMP(pc,name) in_sigtramp (pc)
 110 extern int in_sigtramp PARAMS ((CORE_ADDR pc));