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
   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 /*
  38  * See the comment in m68k-tdep.c regarding the utility of these functions.
  39  */
  40
  41 void
  42 supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp)
  43 {
  44   const long *regp = (const long *)gregsetp;
  45
  46   /* PC is in slot 32, UNIQUE is in slot 33.  */
  47   alpha_supply_int_regs (regcache, -1, regp, regp + 31, regp + 32);
  48 }
  49
  50 void
  51 fill_gregset (const struct regcache *regcache,
  52               gdb_gregset_t *gregsetp, int regno)
  53 {
  54   long *regp = (long *)gregsetp;
  55
  56   /* PC is in slot 32, UNIQUE is in slot 33.  */
  57   alpha_fill_int_regs (regcache, regno, regp, regp + 31, regp + 32);
  58 }
  59
  60 /*
  61  * Now we do the same thing for floating-point registers.
  62  * Again, see the comments in m68k-tdep.c.
  63  */
  64
  65 void
  66 supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregsetp)
  67 {
  68   const long *regp = (const long *)fpregsetp;
  69
  70   /* FPCR is in slot 32.  */
  71   alpha_supply_fp_regs (regcache, -1, regp, regp + 31);
  72 }
  73
  74 void
  75 fill_fpregset (const struct regcache *regcache,
  76                gdb_fpregset_t *fpregsetp, int regno)
  77 {
  78   long *regp = (long *)fpregsetp;
  79
  80   /* FPCR is in slot 32.  */
  81   alpha_fill_fp_regs (regcache, regno, regp, regp + 31);
  82 }
  83
  84
  85 static CORE_ADDR
  86 alpha_linux_register_u_offset (struct gdbarch *gdbarch, int regno, int store_p)
  87 {
  88   if (regno == gdbarch_pc_regnum (gdbarch))
  89     return PC;
  90   if (regno == ALPHA_UNIQUE_REGNUM)
  91     return ALPHA_UNIQUE_PTRACE_ADDR;
  92   if (regno < gdbarch_fp0_regnum (gdbarch))
  93     return GPR_BASE + regno;
  94   else
  95     return FPR_BASE + regno - gdbarch_fp0_regnum (gdbarch);
  96 }
  97
  98 void _initialialize_alpha_linux_nat (void);
  99
 100 void
 101 _initialize_alpha_linux_nat (void)
 102 {
 103   linux_nat_add_target (linux_trad_target (alpha_linux_register_u_offset));
 104 }