gdb/armbsd-tdep.c

   1 /* Target-dependent code for ARM BSD's.
   2
   3    Copyright (C) 2006-2013 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 "osabi.h"
  22 #include "regcache.h"
  23 #include "regset.h"
  24
  25 #include "gdb_assert.h"
  26 #include "gdb_string.h"
  27
  28 #include "arm-tdep.h"
  29
  30 /* Core file support.  */
  31
  32 /* Sizeof `struct reg' in <machine/reg.h>.  */
  33 #define ARMBSD_SIZEOF_GREGS     (17 * 4)
  34
  35 /* Sizeof `struct fpreg' in <machine/reg.h.  */
  36 #define ARMBSD_SIZEOF_FPREGS    ((1 + (8 * 3)) * 4)
  37
  38 static int
  39 armbsd_fpreg_offset (int regnum)
  40 {
  41   if (regnum == ARM_FPS_REGNUM)
  42     return 0;
  43
  44   return 4 + (regnum - ARM_F0_REGNUM) * 12;
  45 }
  46
  47 /* Supply register REGNUM from the buffer specified by FPREGS and LEN
  48    in the floating-point register set REGSET to register cache
  49    REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */
  50
  51 static void
  52 armbsd_supply_fpregset (const struct regset *regset,
  53                         struct regcache *regcache,
  54                         int regnum, const void *fpregs, size_t len)
  55 {
  56   const gdb_byte *regs = fpregs;
  57   int i;
  58
  59   gdb_assert (len >= ARMBSD_SIZEOF_FPREGS);
  60
  61   for (i = ARM_F0_REGNUM; i <= ARM_FPS_REGNUM; i++)
  62     {
  63       if (regnum == i || regnum == -1)
  64         regcache_raw_supply (regcache, i, regs + armbsd_fpreg_offset (i));
  65     }
  66 }
  67
  68 /* Supply register REGNUM from the buffer specified by GREGS and LEN
  69    in the general-purpose register set REGSET to register cache
  70    REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */
  71
  72 static void
  73 armbsd_supply_gregset (const struct regset *regset,
  74                        struct regcache *regcache,
  75                        int regnum, const void *gregs, size_t len)
  76 {
  77   const gdb_byte *regs = gregs;
  78   int i;
  79
  80   gdb_assert (len >= ARMBSD_SIZEOF_GREGS);
  81
  82   for (i = ARM_A1_REGNUM; i <= ARM_PC_REGNUM; i++)
  83     {
  84       if (regnum == i || regnum == -1)
  85         regcache_raw_supply (regcache, i, regs + i * 4);
  86     }
  87
  88   if (regnum == ARM_PS_REGNUM || regnum == -1)
  89     regcache_raw_supply (regcache, i, regs + 16 * 4);
  90
  91   if (len >= ARMBSD_SIZEOF_GREGS + ARMBSD_SIZEOF_FPREGS)
  92     {
  93       regs += ARMBSD_SIZEOF_GREGS;
  94       len -= ARMBSD_SIZEOF_GREGS;
  95       armbsd_supply_fpregset (regset, regcache, regnum, regs, len);
  96     }
  97 }
  98
  99 /* ARM register sets.  */
 100
 101 static struct regset armbsd_gregset =
 102 {
 103   NULL,
 104   armbsd_supply_gregset
 105 };
 106
 107 static struct regset armbsd_fpregset =
 108 {
 109   NULL,
 110   armbsd_supply_fpregset
 111 };
 112
 113 /* Return the appropriate register set for the core section identified
 114    by SECT_NAME and SECT_SIZE.  */
 115
 116 const struct regset *
 117 armbsd_regset_from_core_section (struct gdbarch *gdbarch,
 118                                  const char *sect_name, size_t sect_size)
 119 {
 120   if (strcmp (sect_name, ".reg") == 0 && sect_size >= ARMBSD_SIZEOF_GREGS)
 121     return &armbsd_gregset;
 122
 123   if (strcmp (sect_name, ".reg2") == 0 && sect_size >= ARMBSD_SIZEOF_FPREGS)
 124     return &armbsd_fpregset;
 125
 126   return NULL;
 127 }