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 "regcache.h"
  24 #include "linux-nat.h"
  25
  26 #include "alpha-tdep.h"
  27
  28 #include <sys/ptrace.h>
  29 #include <alpha/ptrace.h>
  30
  31 #include <sys/procfs.h>
  32 #include "gregset.h"
  33
  34 /* The address of UNIQUE for ptrace.  */
  35 #define ALPHA_UNIQUE_PTRACE_ADDR 65
  36
  37
  38 /*
  39  * See the comment in m68k-tdep.c regarding the utility of these functions.
  40  */
  41
  42 void
  43 supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp)
  44 {
  45   const long *regp = (const long *)gregsetp;
  46
  47   /* PC is in slot 32, UNIQUE is in slot 33.  */
  48   alpha_supply_int_regs (regcache, -1, regp, regp + 31, regp + 32);
  49 }
  50
  51 void
  52 fill_gregset (const struct regcache *regcache,
  53               gdb_gregset_t *gregsetp, int regno)
  54 {
  55   long *regp = (long *)gregsetp;
  56
  57   /* PC is in slot 32, UNIQUE is in slot 33.  */
  58   alpha_fill_int_regs (regcache, regno, regp, regp + 31, regp + 32);
  59 }
  60
  61 /*
  62  * Now we do the same thing for floating-point registers.
  63  * Again, see the comments in m68k-tdep.c.
  64  */
  65
  66 void
  67 supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregsetp)
  68 {
  69   const long *regp = (const long *)fpregsetp;
  70
  71   /* FPCR is in slot 32.  */
  72   alpha_supply_fp_regs (regcache, -1, regp, regp + 31);
  73 }
  74
  75 void
  76 fill_fpregset (const struct regcache *regcache,
  77                gdb_fpregset_t *fpregsetp, int regno)
  78 {
  79   long *regp = (long *)fpregsetp;
  80
  81   /* FPCR is in slot 32.  */
  82   alpha_fill_fp_regs (regcache, regno, regp, regp + 31);
  83 }
  84
  85
  86 static CORE_ADDR
  87 alpha_linux_register_u_offset (struct gdbarch *gdbarch, int regno, int store_p)
  88 {
  89   if (regno == PC_REGNUM)
  90     return PC;
  91   if (regno == ALPHA_UNIQUE_REGNUM)
  92     return ALPHA_UNIQUE_PTRACE_ADDR;
  93   if (regno < FP0_REGNUM)
  94     return GPR_BASE + regno;
  95   else
  96     return FPR_BASE + regno - FP0_REGNUM;
  97 }
  98
  99 void _initialialize_alpha_linux_nat (void);
 100
 101 void
 102 _initialize_alpha_linux_nat (void)
 103 {
 104   linux_nat_add_target (linux_trad_target (alpha_linux_register_u_offset));
 105 }