gdb/mips64-obsd-nat.c

   1 /* Native-dependent code for OpenBSD/mips64.
   2
   3    Copyright (C) 2004-2020 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 "inferior.h"
  22 #include "regcache.h"
  23 #include "target.h"
  24
  25 #include <sys/types.h>
  26 #include <sys/ptrace.h>
  27 #include <machine/reg.h>
  28
  29 #include "mips-tdep.h"
  30 #include "inf-ptrace.h"
  31 #include "obsd-nat.h"
  32
  33 /* Shorthand for some register numbers used below.  */
  34 #define MIPS_PC_REGNUM  MIPS_EMBED_PC_REGNUM
  35 #define MIPS_FP0_REGNUM MIPS_EMBED_FP0_REGNUM
  36 #define MIPS_FSR_REGNUM MIPS_EMBED_FP0_REGNUM + 32
  37
  38 struct mips64_obsd_nat_target final : public obsd_nat_target
  39 {
  40   void fetch_registers (struct regcache *, int) override;
  41   void store_registers (struct regcache *, int) override;
  42 };
  43
  44 static mips64_obsd_nat_target the_mips64_obsd_nat_target;
  45
  46 /* Supply the general-purpose registers stored in GREGS to REGCACHE.  */
  47
  48 static void
  49 mips64obsd_supply_gregset (struct regcache *regcache, const void *gregs)
  50 {
  51   const char *regs = gregs;
  52   int regnum;
  53
  54   for (regnum = MIPS_ZERO_REGNUM; regnum <= MIPS_PC_REGNUM; regnum++)
  55     regcache->raw_supply (regnum, regs + regnum * 8);
  56
  57   for (regnum = MIPS_FP0_REGNUM; regnum <= MIPS_FSR_REGNUM; regnum++)
  58     regcache->raw_supply (regnum, regs + (regnum + 2) * 8);
  59 }
  60
  61 /* Collect the general-purpose registers from REGCACHE and store them
  62    in GREGS.  */
  63
  64 static void
  65 mips64obsd_collect_gregset (const struct regcache *regcache,
  66                             void *gregs, int regnum)
  67 {
  68   char *regs = gregs;
  69   int i;
  70
  71   for (i = MIPS_ZERO_REGNUM; i <= MIPS_PC_REGNUM; i++)
  72     {
  73       if (regnum == -1 || regnum == i)
  74         regcache->raw_collect (i, regs + i * 8);
  75     }
  76
  77   for (i = MIPS_FP0_REGNUM; i <= MIPS_FSR_REGNUM; i++)
  78     {
  79       if (regnum == -1 || regnum == i)
  80         regcache->raw_collect (i, regs + (i + 2) * 8);
  81     }
  82 }
  83 \f
  84
  85 /* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
  86    for all registers.  */
  87
  88 void
  89 mips64_obsd_nat_target::fetch_registers (struct regcache *regcache, int regnum)
  90 {
  91   struct reg regs;
  92   pid_t pid = regcache->ptid ().pid ();
  93
  94   if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  95     perror_with_name (_("Couldn't get registers"));
  96
  97   mips64obsd_supply_gregset (regcache, &regs);
  98 }
  99
 100 /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
 101    this for all registers.  */
 102
 103 static void
 104 mips64_obsd_nat_target::store_registers (struct regcache *regcache, int regnum)
 105 {
 106   struct reg regs;
 107   pid_t pid = regcache->ptid ().pid ();
 108
 109   if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 110     perror_with_name (_("Couldn't get registers"));
 111
 112   mips64obsd_collect_gregset (regcache, &regs, regnum);
 113
 114   if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 115     perror_with_name (_("Couldn't write registers"));
 116 }
 117
 118 void
 119 _initialize_mips64obsd_nat (void)
 120 {
 121   add_inf_child_target (&the_mips64_obsd_nat_target);
 122 }