gdb/mips64-obsd-nat.c

   1 /* Native-dependent code for OpenBSD/mips64.
   2
   3    Copyright (C) 2004-2024 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 "inferior.h"
  21 #include "regcache.h"
  22 #include "target.h"
  23
  24 #include <sys/types.h>
  25 #include <sys/ptrace.h>
  26 #include <machine/reg.h>
  27
  28 #include "mips-tdep.h"
  29 #include "inf-ptrace.h"
  30 #include "obsd-nat.h"
  31
  32 /* Shorthand for some register numbers used below.  */
  33 #define MIPS_PC_REGNUM  MIPS_EMBED_PC_REGNUM
  34 #define MIPS_FP0_REGNUM MIPS_EMBED_FP0_REGNUM
  35 #define MIPS_FSR_REGNUM MIPS_EMBED_FP0_REGNUM + 32
  36
  37 struct mips64_obsd_nat_target final : public obsd_nat_target
  38 {
  39   void fetch_registers (struct regcache *, int) override;
  40   void store_registers (struct regcache *, int) override;
  41 };
  42
  43 static mips64_obsd_nat_target the_mips64_obsd_nat_target;
  44
  45 /* Supply the general-purpose registers stored in GREGS to REGCACHE.  */
  46
  47 static void
  48 mips64obsd_supply_gregset (struct regcache *regcache, const void *gregs)
  49 {
  50   const char *regs = gregs;
  51   int regnum;
  52
  53   for (regnum = MIPS_ZERO_REGNUM; regnum <= MIPS_PC_REGNUM; regnum++)
  54     regcache->raw_supply (regnum, regs + regnum * 8);
  55
  56   for (regnum = MIPS_FP0_REGNUM; regnum <= MIPS_FSR_REGNUM; regnum++)
  57     regcache->raw_supply (regnum, regs + (regnum + 2) * 8);
  58 }
  59
  60 /* Collect the general-purpose registers from REGCACHE and store them
  61    in GREGS.  */
  62
  63 static void
  64 mips64obsd_collect_gregset (const struct regcache *regcache,
  65                             void *gregs, int regnum)
  66 {
  67   char *regs = gregs;
  68   int i;
  69
  70   for (i = MIPS_ZERO_REGNUM; i <= MIPS_PC_REGNUM; i++)
  71     {
  72       if (regnum == -1 || regnum == i)
  73         regcache->raw_collect (i, regs + i * 8);
  74     }
  75
  76   for (i = MIPS_FP0_REGNUM; i <= MIPS_FSR_REGNUM; i++)
  77     {
  78       if (regnum == -1 || regnum == i)
  79         regcache->raw_collect (i, regs + (i + 2) * 8);
  80     }
  81 }
  82 \f
  83
  84 /* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
  85    for all registers.  */
  86
  87 void
  88 mips64_obsd_nat_target::fetch_registers (struct regcache *regcache, int regnum)
  89 {
  90   struct reg regs;
  91   pid_t pid = regcache->ptid ().pid ();
  92
  93   if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  94     perror_with_name (_("Couldn't get registers"));
  95
  96   mips64obsd_supply_gregset (regcache, &regs);
  97 }
  98
  99 /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
 100    this for all registers.  */
 101
 102 static void
 103 mips64_obsd_nat_target::store_registers (struct regcache *regcache, int regnum)
 104 {
 105   struct reg regs;
 106   pid_t pid = regcache->ptid ().pid ();
 107
 108   if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 109     perror_with_name (_("Couldn't get registers"));
 110
 111   mips64obsd_collect_gregset (regcache, &regs, regnum);
 112
 113   if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 114     perror_with_name (_("Couldn't write registers"));
 115 }
 116
 117 void _initialize_mips64obsd_nat ();
 118 void
 119 _initialize_mips64obsd_nat ()
 120 {
 121   add_inf_child_target (&the_mips64_obsd_nat_target);
 122 }