gdb/alpha-linux-nat.c

   1 /* Low level Alpha GNU/Linux interface, for GDB when running native.
   2    Copyright (C) 2005-2014 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 #include "defs.h"
  20 #include "target.h"
  21 #include "regcache.h"
  22 #include "linux-nat.h"
  23
  24 #include "alpha-tdep.h"
  25
  26 #include <sys/ptrace.h>
  27 #include <alpha/ptrace.h>
  28
  29 #include <sys/procfs.h>
  30 #include "gregset.h"
  31
  32 /* The address of UNIQUE for ptrace.  */
  33 #define ALPHA_UNIQUE_PTRACE_ADDR 65
  34
  35
  36 /* See the comment in m68k-tdep.c regarding the utility of these
  37    functions.  */
  38
  39 void
  40 supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp)
  41 {
  42   const long *regp = (const long *)gregsetp;
  43
  44   /* PC is in slot 32, UNIQUE is in slot 33.  */
  45   alpha_supply_int_regs (regcache, -1, regp, regp + 31, regp + 32);
  46 }
  47
  48 void
  49 fill_gregset (const struct regcache *regcache,
  50               gdb_gregset_t *gregsetp, int regno)
  51 {
  52   long *regp = (long *)gregsetp;
  53
  54   /* PC is in slot 32, UNIQUE is in slot 33.  */
  55   alpha_fill_int_regs (regcache, regno, regp, regp + 31, regp + 32);
  56 }
  57
  58 /* Now we do the same thing for floating-point registers.
  59    Again, see the comments in m68k-tdep.c.  */
  60
  61 void
  62 supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregsetp)
  63 {
  64   const long *regp = (const long *)fpregsetp;
  65
  66   /* FPCR is in slot 32.  */
  67   alpha_supply_fp_regs (regcache, -1, regp, regp + 31);
  68 }
  69
  70 void
  71 fill_fpregset (const struct regcache *regcache,
  72                gdb_fpregset_t *fpregsetp, int regno)
  73 {
  74   long *regp = (long *)fpregsetp;
  75
  76   /* FPCR is in slot 32.  */
  77   alpha_fill_fp_regs (regcache, regno, regp, regp + 31);
  78 }
  79
  80
  81 static CORE_ADDR
  82 alpha_linux_register_u_offset (struct gdbarch *gdbarch, int regno, int store_p)
  83 {
  84   if (regno == gdbarch_pc_regnum (gdbarch))
  85     return PC;
  86   if (regno == ALPHA_UNIQUE_REGNUM)
  87     return ALPHA_UNIQUE_PTRACE_ADDR;
  88   if (regno < gdbarch_fp0_regnum (gdbarch))
  89     return GPR_BASE + regno;
  90   else
  91     return FPR_BASE + regno - gdbarch_fp0_regnum (gdbarch);
  92 }
  93
  94 void _initialialize_alpha_linux_nat (void);
  95
  96 void
  97 _initialize_alpha_linux_nat (void)
  98 {
  99   linux_nat_add_target (linux_trad_target (alpha_linux_register_u_offset));
 100 }