gdb/alpha-linux-nat.c

   1 /* Low level Alpha GNU/Linux interface, for GDB when running native.
   2    Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011
   3    Free 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 3 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, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "defs.h"
  21 #include "target.h"
  22 #include "regcache.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 /* The address of UNIQUE for ptrace.  */
  34 #define ALPHA_UNIQUE_PTRACE_ADDR 65
  35
  36
  37 /* See the comment in m68k-tdep.c regarding the utility of these
  38    functions.  */
  39
  40 void
  41 supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp)
  42 {
  43   const long *regp = (const long *)gregsetp;
  44
  45   /* PC is in slot 32, UNIQUE is in slot 33.  */
  46   alpha_supply_int_regs (regcache, -1, regp, regp + 31, regp + 32);
  47 }
  48
  49 void
  50 fill_gregset (const struct regcache *regcache,
  51               gdb_gregset_t *gregsetp, int regno)
  52 {
  53   long *regp = (long *)gregsetp;
  54
  55   /* PC is in slot 32, UNIQUE is in slot 33.  */
  56   alpha_fill_int_regs (regcache, regno, regp, regp + 31, regp + 32);
  57 }
  58
  59 /* Now we do the same thing for floating-point registers.
  60    Again, see the comments in m68k-tdep.c.  */
  61
  62 void
  63 supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregsetp)
  64 {
  65   const long *regp = (const long *)fpregsetp;
  66
  67   /* FPCR is in slot 32.  */
  68   alpha_supply_fp_regs (regcache, -1, regp, regp + 31);
  69 }
  70
  71 void
  72 fill_fpregset (const struct regcache *regcache,
  73                gdb_fpregset_t *fpregsetp, int regno)
  74 {
  75   long *regp = (long *)fpregsetp;
  76
  77   /* FPCR is in slot 32.  */
  78   alpha_fill_fp_regs (regcache, regno, regp, regp + 31);
  79 }
  80
  81
  82 static CORE_ADDR
  83 alpha_linux_register_u_offset (struct gdbarch *gdbarch, int regno, int store_p)
  84 {
  85   if (regno == gdbarch_pc_regnum (gdbarch))
  86     return PC;
  87   if (regno == ALPHA_UNIQUE_REGNUM)
  88     return ALPHA_UNIQUE_PTRACE_ADDR;
  89   if (regno < gdbarch_fp0_regnum (gdbarch))
  90     return GPR_BASE + regno;
  91   else
  92     return FPR_BASE + regno - gdbarch_fp0_regnum (gdbarch);
  93 }
  94
  95 void _initialialize_alpha_linux_nat (void);
  96
  97 void
  98 _initialize_alpha_linux_nat (void)
  99 {
 100   linux_nat_add_target (linux_trad_target (alpha_linux_register_u_offset));
 101 }