gdb/armbsd-tdep.c

   1 /* Target-dependent code for ARM BSD's.
   2
   3    Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011
   4    Free Software Foundation, Inc.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 #include "defs.h"
  22 #include "osabi.h"
  23 #include "regcache.h"
  24 #include "regset.h"
  25
  26 #include "gdb_assert.h"
  27 #include "gdb_string.h"
  28
  29 #include "arm-tdep.h"
  30
  31 /* Core file support.  */
  32
  33 /* Sizeof `struct reg' in <machine/reg.h>.  */
  34 #define ARMBSD_SIZEOF_GREGS     (17 * 4)
  35
  36 /* Sizeof `struct fpreg' in <machine/reg.h.  */
  37 #define ARMBSD_SIZEOF_FPREGS    ((1 + (8 * 3)) * 4)
  38
  39 static int
  40 armbsd_fpreg_offset (int regnum)
  41 {
  42   if (regnum == ARM_FPS_REGNUM)
  43     return 0;
  44
  45   return 4 + (regnum - ARM_F0_REGNUM) * 12;
  46 }
  47
  48 /* Supply register REGNUM from the buffer specified by FPREGS and LEN
  49    in the floating-point register set REGSET to register cache
  50    REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */
  51
  52 static void
  53 armbsd_supply_fpregset (const struct regset *regset,
  54                         struct regcache *regcache,
  55                         int regnum, const void *fpregs, size_t len)
  56 {
  57   const gdb_byte *regs = fpregs;
  58   int i;
  59
  60   gdb_assert (len >= ARMBSD_SIZEOF_FPREGS);
  61
  62   for (i = ARM_F0_REGNUM; i <= ARM_FPS_REGNUM; i++)
  63     {
  64       if (regnum == i || regnum == -1)
  65         regcache_raw_supply (regcache, i, regs + armbsd_fpreg_offset (i));
  66     }
  67 }
  68
  69 /* Supply register REGNUM from the buffer specified by GREGS and LEN
  70    in the general-purpose register set REGSET to register cache
  71    REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */
  72
  73 static void
  74 armbsd_supply_gregset (const struct regset *regset,
  75                        struct regcache *regcache,
  76                        int regnum, const void *gregs, size_t len)
  77 {
  78   const gdb_byte *regs = gregs;
  79   int i;
  80
  81   gdb_assert (len >= ARMBSD_SIZEOF_GREGS);
  82
  83   for (i = ARM_A1_REGNUM; i <= ARM_PC_REGNUM; i++)
  84     {
  85       if (regnum == i || regnum == -1)
  86         regcache_raw_supply (regcache, i, regs + i * 4);
  87     }
  88
  89   if (regnum == ARM_PS_REGNUM || regnum == -1)
  90     regcache_raw_supply (regcache, i, regs + 16 * 4);
  91
  92   if (len >= ARMBSD_SIZEOF_GREGS + ARMBSD_SIZEOF_FPREGS)
  93     {
  94       regs += ARMBSD_SIZEOF_GREGS;
  95       len -= ARMBSD_SIZEOF_GREGS;
  96       armbsd_supply_fpregset (regset, regcache, regnum, regs, len);
  97     }
  98 }
  99
 100 /* ARM register sets.  */
 101
 102 static struct regset armbsd_gregset =
 103 {
 104   NULL,
 105   armbsd_supply_gregset
 106 };
 107
 108 static struct regset armbsd_fpregset =
 109 {
 110   NULL,
 111   armbsd_supply_fpregset
 112 };
 113
 114 /* Return the appropriate register set for the core section identified
 115    by SECT_NAME and SECT_SIZE.  */
 116
 117 const struct regset *
 118 armbsd_regset_from_core_section (struct gdbarch *gdbarch,
 119                                  const char *sect_name, size_t sect_size)
 120 {
 121   if (strcmp (sect_name, ".reg") == 0 && sect_size >= ARMBSD_SIZEOF_GREGS)
 122     return &armbsd_gregset;
 123
 124   if (strcmp (sect_name, ".reg2") == 0 && sect_size >= ARMBSD_SIZEOF_FPREGS)
 125     return &armbsd_fpregset;
 126
 127   return NULL;
 128 }