gdb/alpha-linux-nat.c

   1 /* Low level Alpha GNU/Linux interface, for GDB when running native.
   2    Copyright (C) 2005-2020 Free Software Foundation, Inc.
   3
   4    This file is part of GDB.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  18
  19 #include "defs.h"
  20 #include "target.h"
  21 #include "regcache.h"
  22 #include "linux-nat-trad.h"
  23
  24 #include "alpha-tdep.h"
  25 #include "gdbarch.h"
  26
  27 #include "nat/gdb_ptrace.h"
  28 #include <alpha/ptrace.h>
  29
  30 #include <sys/procfs.h>
  31 #include "gregset.h"
  32
  33 /* The address of UNIQUE for ptrace.  */
  34 #define ALPHA_UNIQUE_PTRACE_ADDR 65
  35
  36 class alpha_linux_nat_target final : public linux_nat_trad_target
  37 {
  38 protected:
  39   /* Override linux_nat_trad_target methods.  */
  40   CORE_ADDR register_u_offset (struct gdbarch *gdbarch,
  41                                int regno, int store_p) override;
  42 };
  43
  44 static alpha_linux_nat_target the_alpha_linux_nat_target;
  45
  46 /* See the comment in m68k-tdep.c regarding the utility of these
  47    functions.  */
  48
  49 void
  50 supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp)
  51 {
  52   const long *regp = (const long *)gregsetp;
  53
  54   /* PC is in slot 32, UNIQUE is in slot 33.  */
  55   alpha_supply_int_regs (regcache, -1, regp, regp + 31, regp + 32);
  56 }
  57
  58 void
  59 fill_gregset (const struct regcache *regcache,
  60               gdb_gregset_t *gregsetp, int regno)
  61 {
  62   long *regp = (long *)gregsetp;
  63
  64   /* PC is in slot 32, UNIQUE is in slot 33.  */
  65   alpha_fill_int_regs (regcache, regno, regp, regp + 31, regp + 32);
  66 }
  67
  68 /* Now we do the same thing for floating-point registers.
  69    Again, see the comments in m68k-tdep.c.  */
  70
  71 void
  72 supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregsetp)
  73 {
  74   const long *regp = (const long *)fpregsetp;
  75
  76   /* FPCR is in slot 32.  */
  77   alpha_supply_fp_regs (regcache, -1, regp, regp + 31);
  78 }
  79
  80 void
  81 fill_fpregset (const struct regcache *regcache,
  82                gdb_fpregset_t *fpregsetp, int regno)
  83 {
  84   long *regp = (long *)fpregsetp;
  85
  86   /* FPCR is in slot 32.  */
  87   alpha_fill_fp_regs (regcache, regno, regp, regp + 31);
  88 }
  89
  90 CORE_ADDR
  91 alpha_linux_nat_target::register_u_offset (struct gdbarch *gdbarch,
  92                                            int regno, int store_p)
  93 {
  94   if (regno == gdbarch_pc_regnum (gdbarch))
  95     return PC;
  96   if (regno == ALPHA_UNIQUE_REGNUM)
  97     return ALPHA_UNIQUE_PTRACE_ADDR;
  98   if (regno < gdbarch_fp0_regnum (gdbarch))
  99     return GPR_BASE + regno;
 100   else
 101     return FPR_BASE + regno - gdbarch_fp0_regnum (gdbarch);
 102 }
 103
 104 void
 105 _initialize_alpha_linux_nat (void)
 106 {
 107   linux_target = &the_alpha_linux_nat_target;
 108   add_inf_child_target (&the_alpha_linux_nat_target);
 109 }