gdb/alpha-tdep.h

   1 /* Common target dependent code for GDB on Alpha systems.
   2    Copyright 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2002 Free
   3    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,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 #ifndef ALPHA_TDEP_H
  23 #define ALPHA_TDEP_H
  24
  25 #include "osabi.h"
  26
  27 /* Say how long (ordinary) registers are.  This is a piece of bogosity
  28    used in push_word and a few other places;  REGISTER_RAW_SIZE is the
  29    real way to know how big a register is.  */
  30 #define ALPHA_REGISTER_SIZE 8
  31
  32 /* Number of machine registers.  */
  33 #define ALPHA_NUM_REGS 66
  34
  35 /* Total amount of space needed to store our copies of the machine's
  36    register state.  */
  37 #define ALPHA_REGISTER_BYTES (ALPHA_NUM_REGS * 8)
  38
  39 /* Largest value REGISTER_RAW_SIZE can have.  */
  40 #define ALPHA_MAX_REGISTER_RAW_SIZE 8
  41
  42 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
  43 #define ALPHA_MAX_REGISTER_VIRTUAL_SIZE 8
  44
  45 /* Register numbers of various important registers.
  46    Note that most of these values are "real" register numbers,
  47    and correspond to the general registers of the machine,
  48    and FP_REGNUM is a "phony" register number which is too large
  49    to be an actual register number as far as the user is concerned
  50    but serves to get the desired value when passed to read_register.  */
  51
  52 #define ALPHA_V0_REGNUM      0  /* Function integer return value */
  53 #define ALPHA_T7_REGNUM      8  /* Return address register for OSF/1 __add* */
  54 #define ALPHA_GCC_FP_REGNUM 15  /* Used by gcc as frame register */
  55 #define ALPHA_A0_REGNUM     16  /* Loc of first arg during a subr call */
  56 #define ALPHA_T9_REGNUM     23  /* Return address register for OSF/1 __div* */
  57 #define ALPHA_T12_REGNUM    27  /* Contains start addr of current proc */
  58 #define ALPHA_SP_REGNUM     30  /* Contains address of top of stack */
  59 #define ALPHA_RA_REGNUM     26  /* Contains return address value */
  60 #define ALPHA_ZERO_REGNUM   31  /* Read-only register, always 0 */
  61 #define ALPHA_FP0_REGNUM    32  /* Floating point register 0 */
  62 #define ALPHA_FPA0_REGNUM   48  /* First float arg during a subr call */
  63 #define ALPHA_FPCR_REGNUM   63  /* Floating point control register */
  64 #define ALPHA_PC_REGNUM     64  /* Contains program counter */
  65 #define ALPHA_FP_REGNUM     65  /* Virtual frame pointer */
  66
  67 /* The alpha has two different virtual pointers for arguments and locals.
  68
  69    The virtual argument pointer is pointing to the bottom of the argument
  70    transfer area, which is located immediately below the virtual frame
  71    pointer. Its size is fixed for the native compiler, it is either zero
  72    (for the no arguments case) or large enough to hold all argument registers.
  73    gcc uses a variable sized argument transfer area. As it has
  74    to stay compatible with the native debugging tools it has to use the same
  75    virtual argument pointer and adjust the argument offsets accordingly.
  76
  77    The virtual local pointer is localoff bytes below the virtual frame
  78    pointer, the value of localoff is obtained from the PDR.  */
  79 #define ALPHA_NUM_ARG_REGS   6
  80
  81 /* Target-dependent structure in gdbarch.  */
  82 struct gdbarch_tdep
  83 {
  84   enum gdb_osabi osabi;         /* OS/ABI of inferior.  */
  85
  86   CORE_ADDR vm_min_address;     /* used by heuristic_proc_start */
  87
  88   /* If PC is inside a dynamically-generated signal trampoline function
  89      (i.e. one copied onto the user stack at run-time), return how many
  90      bytes PC is beyond the start of that function.  Otherwise, return -1.  */
  91   LONGEST (*dynamic_sigtramp_offset) (CORE_ADDR);
  92
  93   /* If FRAME refers to a sigtramp frame, return the address of the next
  94      frame.  */
  95   CORE_ADDR (*skip_sigtramp_frame) (struct frame_info *, CORE_ADDR);
  96
  97   /* Translate a signal handler frame into the address of the sigcontext
  98      structure for that signal handler.  */
  99   CORE_ADDR (*sigcontext_addr) (struct frame_info *);
 100
 101   int jb_pc;                    /* Offset to PC value in jump buffer.
 102                                    If htis is negative, longjmp support
 103                                    will be disabled.  */
 104   size_t jb_elt_size;           /* And the size of each entry in the buf. */
 105 };
 106
 107 void alpha_software_single_step (enum target_signal, int);
 108
 109 #endif /* ALPHA_TDEP_H */