1/* Common target dependent code for GDB on Alpha systems.
2   Copyright 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2002, 2003 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/* Say how long (ordinary) registers are.  This is a piece of bogosity
26   used in push_word and a few other places;
27   DEPRECATED_REGISTER_RAW_SIZE is the real way to know how big a
28   register is.  */
29#define ALPHA_REGISTER_SIZE 8
30
31/* Number of machine registers.  */
32#define ALPHA_NUM_REGS 67
33
34/* Total amount of space needed to store our copies of the machine's
35   register state.  */
36#define ALPHA_REGISTER_BYTES (ALPHA_NUM_REGS * 8)
37
38/* Register numbers of various important registers.  Note that most of
39   these values are "real" register numbers, and correspond to the
40   general registers of the machine.  */
41
42#define ALPHA_V0_REGNUM	     0  /* Function integer return value */
43#define ALPHA_T7_REGNUM	     8  /* Return address register for OSF/1 __add* */
44#define ALPHA_GCC_FP_REGNUM 15  /* Used by gcc as frame register */
45#define ALPHA_A0_REGNUM     16  /* Loc of first arg during a subr call */
46#define ALPHA_T9_REGNUM     23  /* Return address register for OSF/1 __div* */
47#define ALPHA_RA_REGNUM     26  /* Contains return address value */
48#define ALPHA_T12_REGNUM    27  /* Contains start addr of current proc */
49#define ALPHA_GP_REGNUM     29  /* Contains the global pointer */
50#define ALPHA_SP_REGNUM     30  /* Contains address of top of stack */
51#define ALPHA_ZERO_REGNUM   31  /* Read-only register, always 0 */
52#define ALPHA_FP0_REGNUM    32  /* Floating point register 0 */
53#define ALPHA_FPA0_REGNUM   48  /* First float arg during a subr call */
54#define ALPHA_FPCR_REGNUM   63  /* Floating point control register */
55#define ALPHA_PC_REGNUM     64  /* Contains program counter */
56#define ALPHA_UNIQUE_REGNUM 66	/* PAL_rduniq value */
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.  */
73struct gdbarch_tdep
74{
75  CORE_ADDR vm_min_address;	/* 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) (CORE_ADDR);
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) (struct frame_info *);
85
86  /* Offset of registers in `struct sigcontext'.  */
87  int sc_pc_offset;
88  int sc_regs_offset;
89  int sc_fpregs_offset;
90
91  int jb_pc;			/* Offset to PC value in jump buffer.
92				   If htis is negative, longjmp support
93				   will be disabled.  */
94  size_t jb_elt_size;		/* And the size of each entry in the buf. */
95};
96
97extern unsigned int alpha_read_insn (CORE_ADDR pc);
98extern void alpha_software_single_step (enum target_signal, int);
99extern CORE_ADDR alpha_after_prologue (CORE_ADDR pc);
100
101extern void alpha_mdebug_init_abi (struct gdbarch_info, struct gdbarch *);
102extern void alpha_dwarf2_init_abi (struct gdbarch_info, struct gdbarch *);
103
104extern void alpha_supply_int_regs (int, const void *, const void *,
105				   const void *);
106extern void alpha_fill_int_regs (int, void *, void *, void *);
107extern void alpha_supply_fp_regs (int, const void *, const void *);
108extern void alpha_fill_fp_regs (int, void *, void *);
109
110#endif /* ALPHA_TDEP_H */
111