gdb/arm-bsd-tdep.c

   1 /* Target-dependent code for ARM BSD's.
   2
   3    Copyright (C) 2006-2020 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 "arm-tdep.h"
  26
  27 /* Core file support.  */
  28
  29 /* Sizeof `struct reg' in <machine/reg.h>.  */
  30 #define ARMBSD_SIZEOF_GREGS     (17 * 4)
  31
  32 /* Sizeof `struct fpreg' in <machine/reg.h.  */
  33 #define ARMBSD_SIZEOF_FPREGS    ((1 + (8 * 3)) * 4)
  34
  35 static int
  36 armbsd_fpreg_offset (int regnum)
  37 {
  38   if (regnum == ARM_FPS_REGNUM)
  39     return 0;
  40
  41   return 4 + (regnum - ARM_F0_REGNUM) * 12;
  42 }
  43
  44 /* Supply register REGNUM from the buffer specified by FPREGS and LEN
  45    in the floating-point register set REGSET to register cache
  46    REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */
  47
  48 static void
  49 armbsd_supply_fpregset (const struct regset *regset,
  50                         struct regcache *regcache,
  51                         int regnum, const void *fpregs, size_t len)
  52 {
  53   const gdb_byte *regs = (const gdb_byte *) fpregs;
  54   int i;
  55
  56   gdb_assert (len >= ARMBSD_SIZEOF_FPREGS);
  57
  58   for (i = ARM_F0_REGNUM; i <= ARM_FPS_REGNUM; i++)
  59     {
  60       if (regnum == i || regnum == -1)
  61         regcache->raw_supply (i, regs + armbsd_fpreg_offset (i));
  62     }
  63 }
  64
  65 /* Supply register REGNUM from the buffer specified by GREGS and LEN
  66    in the general-purpose register set REGSET to register cache
  67    REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */
  68
  69 static void
  70 armbsd_supply_gregset (const struct regset *regset,
  71                        struct regcache *regcache,
  72                        int regnum, const void *gregs, size_t len)
  73 {
  74   const gdb_byte *regs = (const gdb_byte *) gregs;
  75   int i;
  76
  77   gdb_assert (len >= ARMBSD_SIZEOF_GREGS);
  78
  79   for (i = ARM_A1_REGNUM; i <= ARM_PC_REGNUM; i++)
  80     {
  81       if (regnum == i || regnum == -1)
  82         regcache->raw_supply (i, regs + i * 4);
  83     }
  84
  85   if (regnum == ARM_PS_REGNUM || regnum == -1)
  86     regcache->raw_supply (i, regs + 16 * 4);
  87
  88   if (len >= ARMBSD_SIZEOF_GREGS + ARMBSD_SIZEOF_FPREGS)
  89     {
  90       regs += ARMBSD_SIZEOF_GREGS;
  91       len -= ARMBSD_SIZEOF_GREGS;
  92       armbsd_supply_fpregset (regset, regcache, regnum, regs, len);
  93     }
  94 }
  95
  96 /* ARM register sets.  */
  97
  98 static const struct regset armbsd_gregset =
  99 {
 100   NULL,
 101   armbsd_supply_gregset,
 102   NULL,
 103   REGSET_VARIABLE_SIZE
 104 };
 105
 106 static const struct regset armbsd_fpregset =
 107 {
 108   NULL,
 109   armbsd_supply_fpregset
 110 };
 111
 112 /* Iterate over supported core file register note sections. */
 113
 114 void
 115 armbsd_iterate_over_regset_sections (struct gdbarch *gdbarch,
 116                                      iterate_over_regset_sections_cb *cb,
 117                                      void *cb_data,
 118                                      const struct regcache *regcache)
 119 {
 120   cb (".reg", ARMBSD_SIZEOF_GREGS, ARMBSD_SIZEOF_GREGS, &armbsd_gregset, NULL,
 121       cb_data);
 122   cb (".reg2", ARMBSD_SIZEOF_FPREGS, ARMBSD_SIZEOF_FPREGS, &armbsd_fpregset,
 123       NULL, cb_data);
 124 }