gdb/alpha-tdep.h

   1 /* Common target dependent code for GDB on Alpha systems.
   2    Copyright (C) 1993-2024 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 3 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, see <http://www.gnu.org/licenses/>.  */
  18
  19 #ifndef ALPHA_TDEP_H
  20 #define ALPHA_TDEP_H
  21
  22 #include "gdbarch.h"
  23
  24 struct regcache;
  25
  26 /* Say how long (ordinary) registers are.  This is a piece of bogosity
  27    used in push_word and a few other places; register_size() is the
  28    real way to know how big a register is.  */
  29 #define ALPHA_REGISTER_SIZE 8
  30
  31 /* Number of machine registers.  */
  32 #define ALPHA_NUM_REGS 67
  33
  34 /* Register numbers of various important registers.  Note that most of
  35    these values are "real" register numbers, and correspond to the
  36    general registers of the machine.  */
  37
  38 #define ALPHA_V0_REGNUM      0  /* Function integer return value */
  39 #define ALPHA_T7_REGNUM      8  /* Return address register for OSF/1 __add* */
  40 #define ALPHA_S0_REGNUM      9  /* First saved register */
  41 #define ALPHA_GCC_FP_REGNUM 15  /* Used by gcc as frame register */
  42 #define ALPHA_A0_REGNUM     16  /* Loc of first arg during a subr call */
  43 #define ALPHA_T9_REGNUM     23  /* Return address register for OSF/1 __div* */
  44 #define ALPHA_RA_REGNUM     26  /* Contains return address value */
  45 #define ALPHA_T12_REGNUM    27  /* Contains start addr of current proc */
  46 #define ALPHA_GP_REGNUM     29  /* Contains the global pointer */
  47 #define ALPHA_SP_REGNUM     30  /* Contains address of top of stack */
  48 #define ALPHA_ZERO_REGNUM   31  /* Read-only register, always 0 */
  49 #define ALPHA_FP0_REGNUM    32  /* Floating point register 0 */
  50 #define ALPHA_FPA0_REGNUM   48  /* First float arg during a subr call */
  51 #define ALPHA_FPCR_REGNUM   63  /* Floating point control register */
  52 #define ALPHA_PC_REGNUM     64  /* Contains program counter */
  53 #define ALPHA_UNIQUE_REGNUM 66  /* PAL_rduniq value */
  54
  55 /* Instruction size.  */
  56 #define ALPHA_INSN_SIZE 4
  57
  58 /* The alpha has two different virtual pointers for arguments and locals.
  59
  60    The virtual argument pointer is pointing to the bottom of the argument
  61    transfer area, which is located immediately below the virtual frame
  62    pointer.  Its size is fixed for the native compiler, it is either zero
  63    (for the no arguments case) or large enough to hold all argument registers.
  64    gcc uses a variable sized argument transfer area.  As it has
  65    to stay compatible with the native debugging tools it has to use the same
  66    virtual argument pointer and adjust the argument offsets accordingly.
  67
  68    The virtual local pointer is localoff bytes below the virtual frame
  69    pointer, the value of localoff is obtained from the PDR.  */
  70 #define ALPHA_NUM_ARG_REGS   6
  71
  72 /* Target-dependent structure in gdbarch.  */
  73 struct alpha_gdbarch_tdep : gdbarch_tdep_base
  74 {
  75   CORE_ADDR vm_min_address = 0; /* Used by alpha_heuristic_proc_start.  */
  76
  77   /* If PC is inside a dynamically-generated signal trampoline function
  78      (i.e. one copied onto the user stack at run-time), return how many
  79      bytes PC is beyond the start of that function.  Otherwise, return -1.  */
  80   LONGEST (*dynamic_sigtramp_offset) (struct gdbarch *, CORE_ADDR) = nullptr;
  81
  82   /* Translate a signal handler stack base address into the address of
  83      the sigcontext structure for that signal handler.  */
  84   CORE_ADDR (*sigcontext_addr) (const frame_info_ptr &) = nullptr;
  85
  86   /* Does the PC fall in a signal trampoline.  */
  87   /* NOTE: cagney/2004-04-30: Do not copy/clone this code.  Instead
  88      look at tramp-frame.h and other simpler per-architecture
  89      sigtramp unwinders.  */
  90   int (*pc_in_sigtramp) (struct gdbarch *gdbarch, CORE_ADDR pc,
  91                          const char *name) = nullptr;
  92
  93   /* If TYPE will be returned in memory, return true.  */
  94   int (*return_in_memory) (struct type *type) = nullptr;
  95
  96   /* Offset of registers in `struct sigcontext'.  */
  97   int sc_pc_offset = 0;
  98   int sc_regs_offset = 0;
  99   int sc_fpregs_offset = 0;
 100
 101   int jb_pc = 0;                        /* Offset to PC value in jump buffer.
 102                                    If htis is negative, longjmp support
 103                                    will be disabled.  */
 104   size_t jb_elt_size = 0;               /* And the size of each entry in the buf.  */
 105 };
 106
 107 extern unsigned int alpha_read_insn (struct gdbarch *gdbarch, CORE_ADDR pc);
 108 extern std::vector<CORE_ADDR> alpha_software_single_step
 109   (struct regcache *regcache);
 110 extern CORE_ADDR alpha_after_prologue (CORE_ADDR pc);
 111
 112 extern void alpha_mdebug_init_abi (struct gdbarch_info, struct gdbarch *);
 113 extern void alpha_dwarf2_init_abi (struct gdbarch_info, struct gdbarch *);
 114
 115 extern void alpha_supply_int_regs (struct regcache *, int, const void *,
 116                                    const void *, const void *);
 117 extern void alpha_fill_int_regs (const struct regcache *, int,
 118                                  void *, void *, void *);
 119 extern void alpha_supply_fp_regs (struct regcache *, int,
 120                                   const void *, const void *);
 121 extern void alpha_fill_fp_regs (const struct regcache *,
 122                                 int, void *, void *);
 123
 124 #endif /* ALPHA_TDEP_H */