gdb/arm-bsd-tdep.c

   1 /* Target-dependent code for ARM BSD's.
   2
   3    Copyright (C) 2006-2024 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 "osabi.h"
  21 #include "regcache.h"
  22 #include "regset.h"
  23
  24 #include "arm-tdep.h"
  25
  26 /* Core file support.  */
  27
  28 /* Sizeof `struct reg' in <machine/reg.h>.  */
  29 #define ARMBSD_SIZEOF_GREGS     (17 * 4)
  30
  31 /* Sizeof `struct fpreg' in <machine/reg.h.  */
  32 #define ARMBSD_SIZEOF_FPREGS    ((1 + (8 * 3)) * 4)
  33
  34 static int
  35 armbsd_fpreg_offset (int regnum)
  36 {
  37   if (regnum == ARM_FPS_REGNUM)
  38     return 0;
  39
  40   return 4 + (regnum - ARM_F0_REGNUM) * 12;
  41 }
  42
  43 /* Supply register REGNUM from the buffer specified by FPREGS and LEN
  44    in the floating-point register set REGSET to register cache
  45    REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */
  46
  47 static void
  48 armbsd_supply_fpregset (const struct regset *regset,
  49                         struct regcache *regcache,
  50                         int regnum, const void *fpregs, size_t len)
  51 {
  52   const gdb_byte *regs = (const gdb_byte *) fpregs;
  53   int i;
  54
  55   gdb_assert (len >= ARMBSD_SIZEOF_FPREGS);
  56
  57   for (i = ARM_F0_REGNUM; i <= ARM_FPS_REGNUM; i++)
  58     {
  59       if (regnum == i || regnum == -1)
  60         regcache->raw_supply (i, regs + armbsd_fpreg_offset (i));
  61     }
  62 }
  63
  64 /* Supply register REGNUM from the buffer specified by GREGS and LEN
  65    in the general-purpose register set REGSET to register cache
  66    REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */
  67
  68 static void
  69 armbsd_supply_gregset (const struct regset *regset,
  70                        struct regcache *regcache,
  71                        int regnum, const void *gregs, size_t len)
  72 {
  73   const gdb_byte *regs = (const gdb_byte *) gregs;
  74   int i;
  75
  76   gdb_assert (len >= ARMBSD_SIZEOF_GREGS);
  77
  78   for (i = ARM_A1_REGNUM; i <= ARM_PC_REGNUM; i++)
  79     {
  80       if (regnum == i || regnum == -1)
  81         regcache->raw_supply (i, regs + i * 4);
  82     }
  83
  84   if (regnum == ARM_PS_REGNUM || regnum == -1)
  85     regcache->raw_supply (i, regs + 16 * 4);
  86
  87   if (len >= ARMBSD_SIZEOF_GREGS + ARMBSD_SIZEOF_FPREGS)
  88     {
  89       regs += ARMBSD_SIZEOF_GREGS;
  90       len -= ARMBSD_SIZEOF_GREGS;
  91       armbsd_supply_fpregset (regset, regcache, regnum, regs, len);
  92     }
  93 }
  94
  95 /* ARM register sets.  */
  96
  97 static const struct regset armbsd_gregset =
  98 {
  99   NULL,
 100   armbsd_supply_gregset,
 101   NULL,
 102   REGSET_VARIABLE_SIZE
 103 };
 104
 105 static const struct regset armbsd_fpregset =
 106 {
 107   NULL,
 108   armbsd_supply_fpregset
 109 };
 110
 111 /* Iterate over supported core file register note sections. */
 112
 113 void
 114 armbsd_iterate_over_regset_sections (struct gdbarch *gdbarch,
 115                                      iterate_over_regset_sections_cb *cb,
 116                                      void *cb_data,
 117                                      const struct regcache *regcache)
 118 {
 119   cb (".reg", ARMBSD_SIZEOF_GREGS, ARMBSD_SIZEOF_GREGS, &armbsd_gregset, NULL,
 120       cb_data);
 121   cb (".reg2", ARMBSD_SIZEOF_FPREGS, ARMBSD_SIZEOF_FPREGS, &armbsd_fpregset,
 122       NULL, cb_data);
 123 }