gdb/mips64obsd-nat.c

   1 /* Native-dependent code for OpenBSD/mips64.
   2
   3    Copyright (C) 2004, 2007, 2008 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 "inferior.h"
  22 #include "regcache.h"
  23 #include "target.h"
  24
  25 #include <sys/types.h>
  26 #include <sys/ptrace.h>
  27 #include <machine/reg.h>
  28
  29 #include "mips-tdep.h"
  30 #include "inf-ptrace.h"
  31
  32 /* Shorthand for some register numbers used below.  */
  33 #define MIPS_PC_REGNUM  MIPS_EMBED_PC_REGNUM
  34 #define MIPS_FP0_REGNUM MIPS_EMBED_FP0_REGNUM
  35 #define MIPS_FSR_REGNUM MIPS_EMBED_FP0_REGNUM + 32
  36
  37 /* Supply the general-purpose registers stored in GREGS to REGCACHE.  */
  38
  39 static void
  40 mips64obsd_supply_gregset (struct regcache *regcache, const void *gregs)
  41 {
  42   const char *regs = gregs;
  43   int regnum;
  44
  45   for (regnum = MIPS_ZERO_REGNUM; regnum <= MIPS_PC_REGNUM; regnum++)
  46     regcache_raw_supply (regcache, regnum, regs + regnum * 8);
  47
  48   for (regnum = MIPS_FP0_REGNUM; regnum <= MIPS_FSR_REGNUM; regnum++)
  49     regcache_raw_supply (regcache, regnum, regs + (regnum + 2) * 8);
  50 }
  51
  52 /* Collect the general-purpose registers from REGCACHE and store them
  53    in GREGS.  */
  54
  55 static void
  56 mips64obsd_collect_gregset (const struct regcache *regcache,
  57                             void *gregs, int regnum)
  58 {
  59   char *regs = gregs;
  60   int i;
  61
  62   for (i = MIPS_ZERO_REGNUM; i <= MIPS_PC_REGNUM; i++)
  63     {
  64       if (regnum == -1 || regnum == i)
  65         regcache_raw_collect (regcache, i, regs + i * 8);
  66     }
  67
  68   for (i = MIPS_FP0_REGNUM; i <= MIPS_FSR_REGNUM; i++)
  69     {
  70       if (regnum == -1 || regnum == i)
  71         regcache_raw_collect (regcache, i, regs + (i + 2) * 8);
  72     }
  73 }
  74 \f
  75
  76 /* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
  77    for all registers.  */
  78
  79 static void
  80 mips64obsd_fetch_inferior_registers (struct regcache *regcache, int regnum)
  81 {
  82   struct reg regs;
  83
  84   if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
  85               (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  86     perror_with_name (_("Couldn't get registers"));
  87
  88   mips64obsd_supply_gregset (regcache, &regs);
  89 }
  90
  91 /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
  92    this for all registers.  */
  93
  94 static void
  95 mips64obsd_store_inferior_registers (struct regcache *regcache, int regnum)
  96 {
  97   struct reg regs;
  98
  99   if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
 100               (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 101     perror_with_name (_("Couldn't get registers"));
 102
 103   mips64obsd_collect_gregset (regcache, &regs, regnum);
 104
 105   if (ptrace (PT_SETREGS, PIDGET (inferior_ptid),
 106               (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 107     perror_with_name (_("Couldn't write registers"));
 108 }
 109 \f
 110
 111 /* Provide a prototype to silence -Wmissing-prototypes.  */
 112 void _initialize_mips64obsd_nat (void);
 113
 114 void
 115 _initialize_mips64obsd_nat (void)
 116 {
 117   struct target_ops *t;
 118
 119   t = inf_ptrace_target ();
 120   t->to_fetch_registers = mips64obsd_fetch_inferior_registers;
 121   t->to_store_registers = mips64obsd_store_inferior_registers;
 122   add_target (t);
 123 }