gdb/alpha-linux-nat.c

   1 /* Low level Alpha GNU/Linux interface, for GDB when running native.
   2    Copyright (C) 2005, 2006, 2007 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., 51 Franklin Street, Fifth Floor,
  19    Boston, MA 02110-1301, USA.  */
  20
  21 #include "defs.h"
  22 #include "target.h"
  23 #include "linux-nat.h"
  24
  25 #include "alpha-tdep.h"
  26
  27 #include <sys/ptrace.h>
  28 #include <alpha/ptrace.h>
  29
  30 #include <sys/procfs.h>
  31 #include "gregset.h"
  32
  33 /* Given a pointer to either a gregset_t or fpregset_t, return a
  34    pointer to the first register.  */
  35 #define ALPHA_REGSET_BASE(regsetp)  ((long *) (regsetp))
  36
  37 /* Given a pointer to a gregset_t, locate the UNIQUE value.  */
  38 #define ALPHA_REGSET_UNIQUE(regsetp)  ((long *)(regsetp) + 32)
  39
  40 /* The address of UNIQUE for ptrace.  */
  41 #define ALPHA_UNIQUE_PTRACE_ADDR 65
  42
  43
  44 /*
  45  * See the comment in m68k-tdep.c regarding the utility of these functions.
  46  */
  47
  48 void
  49 supply_gregset (gdb_gregset_t *gregsetp)
  50 {
  51   long *regp = ALPHA_REGSET_BASE (gregsetp);
  52   void *unique = ALPHA_REGSET_UNIQUE (gregsetp);
  53
  54   /* PC is in slot 32.  */
  55   alpha_supply_int_regs (-1, regp, regp + 31, unique);
  56 }
  57
  58 void
  59 fill_gregset (gdb_gregset_t *gregsetp, int regno)
  60 {
  61   long *regp = ALPHA_REGSET_BASE (gregsetp);
  62   void *unique = ALPHA_REGSET_UNIQUE (gregsetp);
  63
  64   /* PC is in slot 32.  */
  65   alpha_fill_int_regs (regno, regp, regp + 31, unique);
  66 }
  67
  68 /*
  69  * Now we do the same thing for floating-point registers.
  70  * Again, see the comments in m68k-tdep.c.
  71  */
  72
  73 void
  74 supply_fpregset (gdb_fpregset_t *fpregsetp)
  75 {
  76   long *regp = ALPHA_REGSET_BASE (fpregsetp);
  77
  78   /* FPCR is in slot 32.  */
  79   alpha_supply_fp_regs (-1, regp, regp + 31);
  80 }
  81
  82 void
  83 fill_fpregset (gdb_fpregset_t *fpregsetp, int regno)
  84 {
  85   long *regp = ALPHA_REGSET_BASE (fpregsetp);
  86
  87   /* FPCR is in slot 32.  */
  88   alpha_fill_fp_regs (regno, regp, regp + 31);
  89 }
  90
  91
  92 static CORE_ADDR
  93 alpha_linux_register_u_offset (int regno)
  94 {
  95   if (regno == PC_REGNUM)
  96     return PC;
  97   if (regno == ALPHA_UNIQUE_REGNUM)
  98     return ALPHA_UNIQUE_PTRACE_ADDR;
  99   if (regno < FP0_REGNUM)
 100     return GPR_BASE + regno;
 101   else
 102     return FPR_BASE + regno - FP0_REGNUM;
 103 }
 104
 105 void _initialialize_alpha_linux_nat (void);
 106
 107 void
 108 _initialize_alpha_linux_nat (void)
 109 {
 110   linux_nat_add_target (linux_trad_target (alpha_linux_register_u_offset));
 111 }