gdb/alpha-linux-nat.c

   1 /* Low level Alpha GNU/Linux interface, for GDB when running native.
   2    Copyright (C) 2005-2019 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
  26 #include "nat/gdb_ptrace.h"
  27 #include <alpha/ptrace.h>
  28
  29 #include <sys/procfs.h>
  30 #include "gregset.h"
  31
  32 /* The address of UNIQUE for ptrace.  */
  33 #define ALPHA_UNIQUE_PTRACE_ADDR 65
  34
  35 class alpha_linux_nat_target final : public linux_nat_trad_target
  36 {
  37 protected:
  38   /* Override linux_nat_trad_target methods.  */
  39   CORE_ADDR register_u_offset (struct gdbarch *gdbarch,
  40                                int regno, int store_p) override;
  41 };
  42
  43 static alpha_linux_nat_target the_alpha_linux_nat_target;
  44
  45 /* See the comment in m68k-tdep.c regarding the utility of these
  46    functions.  */
  47
  48 void
  49 supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp)
  50 {
  51   const long *regp = (const long *)gregsetp;
  52
  53   /* PC is in slot 32, UNIQUE is in slot 33.  */
  54   alpha_supply_int_regs (regcache, -1, regp, regp + 31, regp + 32);
  55 }
  56
  57 void
  58 fill_gregset (const struct regcache *regcache,
  59               gdb_gregset_t *gregsetp, int regno)
  60 {
  61   long *regp = (long *)gregsetp;
  62
  63   /* PC is in slot 32, UNIQUE is in slot 33.  */
  64   alpha_fill_int_regs (regcache, regno, regp, regp + 31, regp + 32);
  65 }
  66
  67 /* Now we do the same thing for floating-point registers.
  68    Again, see the comments in m68k-tdep.c.  */
  69
  70 void
  71 supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregsetp)
  72 {
  73   const long *regp = (const long *)fpregsetp;
  74
  75   /* FPCR is in slot 32.  */
  76   alpha_supply_fp_regs (regcache, -1, regp, regp + 31);
  77 }
  78
  79 void
  80 fill_fpregset (const struct regcache *regcache,
  81                gdb_fpregset_t *fpregsetp, int regno)
  82 {
  83   long *regp = (long *)fpregsetp;
  84
  85   /* FPCR is in slot 32.  */
  86   alpha_fill_fp_regs (regcache, regno, regp, regp + 31);
  87 }
  88
  89 CORE_ADDR
  90 alpha_linux_nat_target::register_u_offset (struct gdbarch *gdbarch,
  91                                            int regno, int store_p)
  92 {
  93   if (regno == gdbarch_pc_regnum (gdbarch))
  94     return PC;
  95   if (regno == ALPHA_UNIQUE_REGNUM)
  96     return ALPHA_UNIQUE_PTRACE_ADDR;
  97   if (regno < gdbarch_fp0_regnum (gdbarch))
  98     return GPR_BASE + regno;
  99   else
 100     return FPR_BASE + regno - gdbarch_fp0_regnum (gdbarch);
 101 }
 102
 103 void
 104 _initialize_alpha_linux_nat (void)
 105 {
 106   linux_target = &the_alpha_linux_nat_target;
 107   add_inf_child_target (&the_alpha_linux_nat_target);
 108 }