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 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 /*
  37  * See the comment in m68k-tdep.c regarding the utility of these functions.
  38  */
  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 /*
  60  * Now we do the same thing for floating-point registers.
  61  * Again, see the comments in m68k-tdep.c.
  62  */
  63
  64 void
  65 supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregsetp)
  66 {
  67   const long *regp = (const long *)fpregsetp;
  68
  69   /* FPCR is in slot 32.  */
  70   alpha_supply_fp_regs (regcache, -1, regp, regp + 31);
  71 }
  72
  73 void
  74 fill_fpregset (const struct regcache *regcache,
  75                gdb_fpregset_t *fpregsetp, int regno)
  76 {
  77   long *regp = (long *)fpregsetp;
  78
  79   /* FPCR is in slot 32.  */
  80   alpha_fill_fp_regs (regcache, regno, regp, regp + 31);
  81 }
  82
  83
  84 static CORE_ADDR
  85 alpha_linux_register_u_offset (struct gdbarch *gdbarch, int regno, int store_p)
  86 {
  87   if (regno == gdbarch_pc_regnum (gdbarch))
  88     return PC;
  89   if (regno == ALPHA_UNIQUE_REGNUM)
  90     return ALPHA_UNIQUE_PTRACE_ADDR;
  91   if (regno < gdbarch_fp0_regnum (gdbarch))
  92     return GPR_BASE + regno;
  93   else
  94     return FPR_BASE + regno - gdbarch_fp0_regnum (gdbarch);
  95 }
  96
  97 void _initialialize_alpha_linux_nat (void);
  98
  99 void
 100 _initialize_alpha_linux_nat (void)
 101 {
 102   linux_nat_add_target (linux_trad_target (alpha_linux_register_u_offset));
 103 }