gdb/armbsd-tdep.c

   1 /* Target-dependent code for ARM BSD's.
   2
   3    Copyright (C) 2006 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 "osabi.h"
  24 #include "regcache.h"
  25 #include "regset.h"
  26
  27 #include "gdb_assert.h"
  28 #include "gdb_string.h"
  29
  30 #include "arm-tdep.h"
  31
  32 /* Core file support.  */
  33
  34 /* Sizeof `struct reg' in <machine/reg.h>.  */
  35 #define ARMBSD_SIZEOF_GREGS     (17 * 4)
  36
  37 /* Sizeof `struct fpreg' in <machine/reg.h.  */
  38 #define ARMBSD_SIZEOF_FPREGS    ((1 + (8 * 3)) * 4)
  39
  40 int
  41 armbsd_fpreg_offset (int regnum)
  42 {
  43   if (regnum == ARM_FPS_REGNUM)
  44     return 0;
  45
  46   return 4 + (regnum - ARM_F0_REGNUM) * 12;
  47 }
  48
  49 /* Supply register REGNUM from the buffer specified by FPREGS and LEN
  50    in the floating-point register set REGSET to register cache
  51    REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */
  52
  53 static void
  54 armbsd_supply_fpregset (const struct regset *regset,
  55                         struct regcache *regcache,
  56                         int regnum, const void *fpregs, size_t len)
  57 {
  58   const gdb_byte *regs = fpregs;
  59   int i;
  60
  61   gdb_assert (len >= ARMBSD_SIZEOF_FPREGS);
  62
  63   for (i = ARM_F0_REGNUM; i <= ARM_FPS_REGNUM; i++)
  64     {
  65       if (regnum == i || regnum == -1)
  66         regcache_raw_supply (regcache, i, regs + armbsd_fpreg_offset (i));
  67     }
  68 }
  69
  70 /* Supply register REGNUM from the buffer specified by GREGS and LEN
  71    in the general-purpose register set REGSET to register cache
  72    REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */
  73
  74 static void
  75 armbsd_supply_gregset (const struct regset *regset,
  76                        struct regcache *regcache,
  77                        int regnum, const void *gregs, size_t len)
  78 {
  79   const gdb_byte *regs = gregs;
  80   int i;
  81
  82   gdb_assert (len >= ARMBSD_SIZEOF_GREGS);
  83
  84   for (i = ARM_A1_REGNUM; i <= ARM_PC_REGNUM; i++)
  85     {
  86       if (regnum == i || regnum == -1)
  87         regcache_raw_supply (regcache, i, regs + i * 4);
  88     }
  89
  90   if (regnum == ARM_PS_REGNUM || regnum == -1)
  91     regcache_raw_supply (regcache, i, regs + 16 * 4);
  92
  93   if (len >= ARMBSD_SIZEOF_GREGS + ARMBSD_SIZEOF_FPREGS)
  94     {
  95       regs += ARMBSD_SIZEOF_GREGS;
  96       len -= ARMBSD_SIZEOF_GREGS;
  97       armbsd_supply_fpregset (regset, regcache, regnum, regs, len);
  98     }
  99 }
 100
 101 /* ARM register sets.  */
 102
 103 static struct regset armbsd_gregset =
 104 {
 105   NULL,
 106   armbsd_supply_gregset
 107 };
 108
 109 static struct regset armbsd_fpregset =
 110 {
 111   NULL,
 112   armbsd_supply_fpregset
 113 };
 114
 115 /* Return the appropriate register set for the core section identified
 116    by SECT_NAME and SECT_SIZE.  */
 117
 118 const struct regset *
 119 armbsd_regset_from_core_section (struct gdbarch *gdbarch,
 120                                  const char *sect_name, size_t sect_size)
 121 {
 122   if (strcmp (sect_name, ".reg") == 0 && sect_size >= ARMBSD_SIZEOF_GREGS)
 123     return &armbsd_gregset;
 124
 125   if (strcmp (sect_name, ".reg2") == 0 && sect_size >= ARMBSD_SIZEOF_FPREGS)
 126     return &armbsd_fpregset;
 127
 128   return NULL;
 129 }