gdb/arm-bsd-tdep.c

   1 /* Target-dependent code for ARM BSD's.
   2
   3    Copyright (C) 2006-2019 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
  22 /* Local non-gdb includes.  */
  23 #include "arm-tdep.h"
  24 #include "osabi.h"
  25 #include "regcache.h"
  26 #include "regset.h"
  27
  28 /* Core file support.  */
  29
  30 /* Sizeof `struct reg' in <machine/reg.h>.  */
  31 #define ARMBSD_SIZEOF_GREGS     (17 * 4)
  32
  33 /* Sizeof `struct fpreg' in <machine/reg.h.  */
  34 #define ARMBSD_SIZEOF_FPREGS    ((1 + (8 * 3)) * 4)
  35
  36 static int
  37 armbsd_fpreg_offset (int regnum)
  38 {
  39   if (regnum == ARM_FPS_REGNUM)
  40     return 0;
  41
  42   return 4 + (regnum - ARM_F0_REGNUM) * 12;
  43 }
  44
  45 /* Supply register REGNUM from the buffer specified by FPREGS and LEN
  46    in the floating-point register set REGSET to register cache
  47    REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */
  48
  49 static void
  50 armbsd_supply_fpregset (const struct regset *regset,
  51                         struct regcache *regcache,
  52                         int regnum, const void *fpregs, size_t len)
  53 {
  54   const gdb_byte *regs = (const gdb_byte *) fpregs;
  55   int i;
  56
  57   gdb_assert (len >= ARMBSD_SIZEOF_FPREGS);
  58
  59   for (i = ARM_F0_REGNUM; i <= ARM_FPS_REGNUM; i++)
  60     {
  61       if (regnum == i || regnum == -1)
  62         regcache->raw_supply (i, regs + armbsd_fpreg_offset (i));
  63     }
  64 }
  65
  66 /* Supply register REGNUM from the buffer specified by GREGS and LEN
  67    in the general-purpose register set REGSET to register cache
  68    REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */
  69
  70 static void
  71 armbsd_supply_gregset (const struct regset *regset,
  72                        struct regcache *regcache,
  73                        int regnum, const void *gregs, size_t len)
  74 {
  75   const gdb_byte *regs = (const gdb_byte *) gregs;
  76   int i;
  77
  78   gdb_assert (len >= ARMBSD_SIZEOF_GREGS);
  79
  80   for (i = ARM_A1_REGNUM; i <= ARM_PC_REGNUM; i++)
  81     {
  82       if (regnum == i || regnum == -1)
  83         regcache->raw_supply (i, regs + i * 4);
  84     }
  85
  86   if (regnum == ARM_PS_REGNUM || regnum == -1)
  87     regcache->raw_supply (i, regs + 16 * 4);
  88
  89   if (len >= ARMBSD_SIZEOF_GREGS + ARMBSD_SIZEOF_FPREGS)
  90     {
  91       regs += ARMBSD_SIZEOF_GREGS;
  92       len -= ARMBSD_SIZEOF_GREGS;
  93       armbsd_supply_fpregset (regset, regcache, regnum, regs, len);
  94     }
  95 }
  96
  97 /* ARM register sets.  */
  98
  99 static const struct regset armbsd_gregset =
 100 {
 101   NULL,
 102   armbsd_supply_gregset,
 103   NULL,
 104   REGSET_VARIABLE_SIZE
 105 };
 106
 107 static const struct regset armbsd_fpregset =
 108 {
 109   NULL,
 110   armbsd_supply_fpregset
 111 };
 112
 113 /* Iterate over supported core file register note sections. */
 114
 115 void
 116 armbsd_iterate_over_regset_sections (struct gdbarch *gdbarch,
 117                                      iterate_over_regset_sections_cb *cb,
 118                                      void *cb_data,
 119                                      const struct regcache *regcache)
 120 {
 121   cb (".reg", ARMBSD_SIZEOF_GREGS, ARMBSD_SIZEOF_GREGS, &armbsd_gregset, NULL,
 122       cb_data);
 123   cb (".reg2", ARMBSD_SIZEOF_FPREGS, ARMBSD_SIZEOF_FPREGS, &armbsd_fpregset,
 124       NULL, cb_data);
 125 }