gdb/config/alpha/tm-alpha.h

   1 /* Definitions to make GDB run on an Alpha box under OSF1.  This is
   2    also used by the Alpha/Netware and Alpha GNU/Linux targets.
   3
   4    Copyright 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2002 Free
   5    Software Foundation, Inc.
   6
   7    This file is part of GDB.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 59 Temple Place - Suite 330,
  22    Boston, MA 02111-1307, USA.  */
  23
  24 #ifndef TM_ALPHA_H
  25 #define TM_ALPHA_H
  26
  27 #define GDB_MULTI_ARCH GDB_MULTI_ARCH_PARTIAL
  28
  29 #include "regcache.h"
  30 #include "bfd.h"
  31 #include "coff/sym.h"           /* Needed for PDR below.  */
  32 #include "coff/symconst.h"
  33
  34 struct frame_info;
  35 struct type;
  36 struct value;
  37 struct symbol;
  38
  39 /* Number of traps that happen between exec'ing the shell
  40  * to run an inferior, and when we finally get to
  41  * the inferior code.  This is 2 on most implementations.
  42  */
  43 #define START_INFERIOR_TRAPS_EXPECTED 3
  44
  45 /* Offset from address of function to start of its code.
  46    Zero on most machines.  */
  47
  48 #define FUNCTION_START_OFFSET 0
  49
  50 /* Are we currently handling a signal ?  */
  51
  52 #define IN_SIGTRAMP(pc, name) alpha_osf_in_sigtramp ((pc), (name))
  53 extern int alpha_osf_in_sigtramp (CORE_ADDR, char *);
  54
  55 #define BREAKPOINT {0x80, 0, 0, 0}      /* call_pal bpt */
  56
  57 /* Special symbol found in blocks associated with routines.  We can hang
  58    alpha_extra_func_info_t's off of this.  */
  59
  60 #define MIPS_EFI_SYMBOL_NAME "__GDB_EFI_INFO__"
  61 extern void ecoff_relocate_efi (struct symbol *, CORE_ADDR);
  62
  63 #define RA_REGNUM 26            /* XXXJRT needed by mdebugread.c */
  64
  65 /* Specific information about a procedure.
  66    This overlays the ALPHA's PDR records,
  67    alpharead.c (ab)uses this to save memory */
  68
  69 typedef struct alpha_extra_func_info
  70   {
  71     long numargs;               /* number of args to procedure (was iopt) */
  72     PDR pdr;                    /* Procedure descriptor record */
  73   }
  74  *alpha_extra_func_info_t;
  75
  76 /* Define the extra_func_info that mipsread.c needs.
  77    FIXME: We should define our own PDR interface, perhaps in a separate
  78    header file. This would get rid of the <bfd.h> inclusion in all sources
  79    and would abstract the mips/alpha interface from ecoff.  */
  80 #define mips_extra_func_info alpha_extra_func_info
  81 #define mips_extra_func_info_t alpha_extra_func_info_t
  82
  83
  84 #define PRINT_EXTRA_FRAME_INFO(fi) alpha_print_extra_frame_info ((fi))
  85 extern void alpha_print_extra_frame_info (struct frame_info *);
  86
  87
  88 /* It takes two values to specify a frame on the ALPHA.  Sigh.
  89
  90    In fact, at the moment, the *PC* is the primary value that sets up
  91    a frame.  The PC is looked up to see what function it's in; symbol
  92    information from that function tells us which register is the frame
  93    pointer base, and what offset from there is the "virtual frame pointer".
  94    (This is usually an offset from SP.)  FIXME -- this should be cleaned
  95    up so that the primary value is the SP, and the PC is used to disambiguate
  96    multiple functions with the same SP that are at different stack levels. */
  97
  98 #define SETUP_ARBITRARY_FRAME(argc, argv) \
  99   alpha_setup_arbitrary_frame (argc, argv)
 100 extern struct frame_info *alpha_setup_arbitrary_frame (int, CORE_ADDR *);
 101
 102 /* This is used by heuristic_proc_start.  It should be shot it the head.  */
 103 #ifndef VM_MIN_ADDRESS
 104 #define VM_MIN_ADDRESS (CORE_ADDR)0x120000000
 105 #endif
 106
 107 /* If PC is in a shared library trampoline code, return the PC
 108    where the function itself actually starts.  If not, return 0.  */
 109 #define SKIP_TRAMPOLINE_CODE(pc)  find_solib_trampoline_target (pc)
 110
 111 /* If the current gcc for for this target does not produce correct debugging
 112    information for float parameters, both prototyped and unprototyped, then
 113    define this macro.  This forces gdb to  always assume that floats are
 114    passed as doubles and then converted in the callee.
 115
 116    For the alpha, it appears that the debug info marks the parameters as
 117    floats regardless of whether the function is prototyped, but the actual
 118    values are always passed in as doubles.  Thus by setting this to 1, both
 119    types of calls will work. */
 120
 121 #define COERCE_FLOAT_TO_DOUBLE(formal, actual) \
 122   standard_coerce_float_to_double ((formal), (actual))
 123
 124 /* Return TRUE if procedure descriptor PROC is a procedure descriptor
 125    that refers to a dynamically generated sigtramp function.
 126
 127    OSF/1 doesn't use dynamic sigtramp functions, so this is always
 128    FALSE.  */
 129
 130 #define PROC_DESC_IS_DYN_SIGTRAMP(proc) (0)
 131 #define SET_PROC_DESC_IS_DYN_SIGTRAMP(proc)
 132
 133 /* If PC is inside a dynamically generated sigtramp function, return
 134    how many bytes the program counter is beyond the start of that
 135    function.  Otherwise, return a negative value.
 136
 137    OSF/1 doesn't use dynamic sigtramp functions, so this always
 138    returns -1.  */
 139
 140 #define DYNAMIC_SIGTRAMP_OFFSET(pc)     (-1)
 141
 142 /* Translate a signal handler frame into the address of the sigcontext
 143    structure.  */
 144
 145 #define SIGCONTEXT_ADDR(frame) \
 146   (read_memory_integer ((frame)->next ? frame->next->frame : frame->frame, 8))
 147
 148 /* If FRAME refers to a sigtramp frame, return the address of the next
 149    frame.  */
 150
 151 #define FRAME_PAST_SIGTRAMP_FRAME(frame, pc) \
 152   (alpha_osf_skip_sigtramp_frame (frame, pc))
 153 extern CORE_ADDR alpha_osf_skip_sigtramp_frame (struct frame_info *,
 154                                                 CORE_ADDR);
 155
 156 /* Single step based on where the current instruction will take us.  */
 157 extern void alpha_software_single_step (enum target_signal, int);
 158
 159 #endif /* TM_ALPHA_H */