gdb/mips64obsd-nat.c

   1 /* Native-dependent code for OpenBSD/mips64.
   2
   3    Copyright (C) 2004, 2007 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 2 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, write to the Free Software
  19    Foundation, Inc., 51 Franklin Street, Fifth Floor,
  20    Boston, MA 02110-1301, USA.  */
  21
  22 #include "defs.h"
  23 #include "inferior.h"
  24 #include "regcache.h"
  25 #include "target.h"
  26
  27 #include <sys/types.h>
  28 #include <sys/ptrace.h>
  29 #include <machine/reg.h>
  30
  31 #include "mips-tdep.h"
  32 #include "inf-ptrace.h"
  33
  34 /* Shorthand for some register numbers used below.  */
  35 #define MIPS_PC_REGNUM  MIPS_EMBED_PC_REGNUM
  36 #define MIPS_FP0_REGNUM MIPS_EMBED_FP0_REGNUM
  37 #define MIPS_FSR_REGNUM MIPS_EMBED_FP0_REGNUM + 32
  38
  39 /* Supply the general-purpose registers stored in GREGS to REGCACHE.  */
  40
  41 static void
  42 mips64obsd_supply_gregset (struct regcache *regcache, const void *gregs)
  43 {
  44   const char *regs = gregs;
  45   int regnum;
  46
  47   for (regnum = MIPS_ZERO_REGNUM; regnum <= MIPS_PC_REGNUM; regnum++)
  48     regcache_raw_supply (regcache, regnum, regs + regnum * 8);
  49
  50   for (regnum = MIPS_FP0_REGNUM; regnum <= MIPS_FSR_REGNUM; regnum++)
  51     regcache_raw_supply (regcache, regnum, regs + (regnum + 2) * 8);
  52 }
  53
  54 /* Collect the general-purpose registers from REGCACHE and store them
  55    in GREGS.  */
  56
  57 static void
  58 mips64obsd_collect_gregset (const struct regcache *regcache,
  59                             void *gregs, int regnum)
  60 {
  61   char *regs = gregs;
  62   int i;
  63
  64   for (i = MIPS_ZERO_REGNUM; i <= MIPS_PC_REGNUM; i++)
  65     {
  66       if (regnum == -1 || regnum == i)
  67         regcache_raw_collect (regcache, i, regs + i * 8);
  68     }
  69
  70   for (i = MIPS_FP0_REGNUM; i <= MIPS_FSR_REGNUM; i++)
  71     {
  72       if (regnum == -1 || regnum == i)
  73         regcache_raw_collect (regcache, i, regs + (i + 2) * 8);
  74     }
  75 }
  76 \f
  77
  78 /* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
  79    for all registers.  */
  80
  81 static void
  82 mips64obsd_fetch_inferior_registers (int regnum)
  83 {
  84   struct reg regs;
  85
  86   if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
  87               (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  88     perror_with_name (_("Couldn't get registers"));
  89
  90   mips64obsd_supply_gregset (current_regcache, &regs);
  91 }
  92
  93 /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
  94    this for all registers.  */
  95
  96 static void
  97 mips64obsd_store_inferior_registers (int regnum)
  98 {
  99   struct reg regs;
 100
 101   if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
 102               (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 103     perror_with_name (_("Couldn't get registers"));
 104
 105   mips64obsd_collect_gregset (current_regcache, &regs, regnum);
 106
 107   if (ptrace (PT_SETREGS, PIDGET (inferior_ptid),
 108               (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 109     perror_with_name (_("Couldn't write registers"));
 110 }
 111 \f
 112
 113 /* Provide a prototype to silence -Wmissing-prototypes.  */
 114 void _initialize_mips64obsd_nat (void);
 115
 116 void
 117 _initialize_mips64obsd_nat (void)
 118 {
 119   struct target_ops *t;
 120
 121   t = inf_ptrace_target ();
 122   t->to_fetch_registers = mips64obsd_fetch_inferior_registers;
 123   t->to_store_registers = mips64obsd_store_inferior_registers;
 124   add_target (t);
 125 }