gdb/hppa-obsd-nat.c

   1 /* Native-dependent code for OpenBSD/hppa.
   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 "hppa-tdep.h"
  30 #include "inf-ptrace.h"
  31
  32 #include "obsd-nat.h"
  33
  34 struct hppa_obsd_nat_target final : public obsd_nat_target
  35 {
  36   void fetch_registers (struct regcache *, int) override;
  37   void store_registers (struct regcache *, int) override;
  38 };
  39
  40 static hppa_obsd_nat_target the_hppa_obsd_nat_target;
  41
  42 static int
  43 hppaobsd_gregset_supplies_p (int regnum)
  44 {
  45   return (regnum >= HPPA_R0_REGNUM && regnum <= HPPA_CR27_REGNUM);
  46 }
  47
  48 static int
  49 hppaobsd_fpregset_supplies_p (int regnum)
  50 {
  51   return (regnum >= HPPA_FP0_REGNUM && regnum <= HPPA_FP31R_REGNUM);
  52 }
  53
  54 /* Supply the general-purpose registers stored in GREGS to REGCACHE.  */
  55
  56 static void
  57 hppaobsd_supply_gregset (struct regcache *regcache, const void *gregs)
  58 {
  59   gdb_byte zero[4] = { 0 };
  60   const char *regs = gregs;
  61   int regnum;
  62
  63   regcache->raw_supply (HPPA_R0_REGNUM, &zero);
  64   for (regnum = HPPA_R1_REGNUM; regnum <= HPPA_R31_REGNUM; regnum++)
  65     regcache->raw_supply (regnum, regs + regnum * 4);
  66
  67   if (sizeof(struct reg) >= 46 * 4)
  68     {
  69       regcache->raw_supply (HPPA_IPSW_REGNUM, regs);
  70       regcache->raw_supply (HPPA_SAR_REGNUM, regs + 32 * 4);
  71       regcache->raw_supply (HPPA_PCSQ_HEAD_REGNUM, regs + 33 * 4);
  72       regcache->raw_supply (HPPA_PCSQ_TAIL_REGNUM, regs + 34 * 4);
  73       regcache->raw_supply (HPPA_PCOQ_HEAD_REGNUM, regs + 35 * 4);
  74       regcache->raw_supply (HPPA_PCOQ_TAIL_REGNUM, regs + 36 * 4);
  75       regcache->raw_supply (HPPA_SR0_REGNUM, regs + 37 * 4);
  76       regcache->raw_supply (HPPA_SR1_REGNUM, regs + 38 * 4);
  77       regcache->raw_supply (HPPA_SR2_REGNUM, regs + 39 * 4);
  78       regcache->raw_supply (HPPA_SR3_REGNUM, regs + 40 * 4);
  79       regcache->raw_supply (HPPA_SR4_REGNUM, regs + 41 * 4);
  80       regcache->raw_supply (HPPA_SR5_REGNUM, regs + 42 * 4);
  81       regcache->raw_supply (HPPA_SR6_REGNUM, regs + 43 * 4);
  82       regcache->raw_supply (HPPA_SR7_REGNUM, regs + 44 * 4);
  83       regcache->raw_supply (HPPA_CR26_REGNUM, regs + 45 * 4);
  84       regcache->raw_supply (HPPA_CR27_REGNUM, regs + 46 * 4);
  85     }
  86   else
  87     {
  88       regcache->raw_supply (HPPA_SAR_REGNUM, regs);
  89       regcache->raw_supply (HPPA_PCOQ_HEAD_REGNUM, regs + 32 * 4);
  90       regcache->raw_supply (HPPA_PCOQ_TAIL_REGNUM, regs + 33 * 4);
  91     }
  92 }
  93
  94 /* Supply the floating-point registers stored in FPREGS to REGCACHE.  */
  95
  96 static void
  97 hppaobsd_supply_fpregset (struct regcache *regcache, const void *fpregs)
  98 {
  99   const char *regs = fpregs;
 100   int regnum;
 101
 102   for (regnum = HPPA_FP0_REGNUM; regnum <= HPPA_FP31R_REGNUM;
 103        regnum += 2, regs += 8)
 104     {
 105       regcache->raw_supply (regnum, regs);
 106       regcache->raw_supply (regnum + 1, regs + 4);
 107     }
 108 }
 109
 110 /* Collect the general-purpose registers from REGCACHE and store them
 111    in GREGS.  */
 112
 113 static void
 114 hppaobsd_collect_gregset (const struct regcache *regcache,
 115                           void *gregs, int regnum)
 116 {
 117   char *regs = gregs;
 118   int i;
 119
 120   for (i = HPPA_R1_REGNUM; i <= HPPA_R31_REGNUM; i++)
 121     {
 122       if (regnum == -1 || regnum == i)
 123         regcache->raw_collect (i, regs + i * 4);
 124     }
 125
 126   if (sizeof(struct reg) >= 46 * 4)
 127     {
 128       if (regnum == -1 || regnum == HPPA_IPSW_REGNUM)
 129         regcache->raw_collect (HPPA_IPSW_REGNUM, regs);
 130       if (regnum == -1 || regnum == HPPA_SAR_REGNUM)
 131         regcache->raw_collect (HPPA_SAR_REGNUM, regs + 32 * 4);
 132       if (regnum == -1 || regnum == HPPA_PCSQ_HEAD_REGNUM)
 133         regcache->raw_collect (HPPA_PCSQ_HEAD_REGNUM, regs + 33 * 4);
 134       if (regnum == -1 || regnum == HPPA_PCSQ_TAIL_REGNUM)
 135         regcache->raw_collect (HPPA_PCSQ_TAIL_REGNUM, regs + 34 * 4);
 136       if (regnum == -1 || regnum == HPPA_PCOQ_HEAD_REGNUM)
 137         regcache->raw_collect (HPPA_PCOQ_HEAD_REGNUM, regs + 35 * 4);
 138       if (regnum == -1 || regnum == HPPA_PCOQ_TAIL_REGNUM)
 139         regcache->raw_collect (HPPA_PCOQ_TAIL_REGNUM, regs + 36 * 4);
 140       if (regnum == -1 || regnum == HPPA_SR0_REGNUM)
 141         regcache->raw_collect (HPPA_SR0_REGNUM, regs + 37 * 4);
 142       if (regnum == -1 || regnum == HPPA_SR1_REGNUM)
 143         regcache->raw_collect (HPPA_SR1_REGNUM, regs + 38 * 4);
 144       if (regnum == -1 || regnum == HPPA_SR2_REGNUM)
 145         regcache->raw_collect (HPPA_SR2_REGNUM, regs + 39 * 4);
 146       if (regnum == -1 || regnum == HPPA_SR3_REGNUM)
 147         regcache->raw_collect (HPPA_SR3_REGNUM, regs + 40 * 4);
 148       if (regnum == -1 || regnum == HPPA_SR4_REGNUM)
 149         regcache->raw_collect (HPPA_SR4_REGNUM, regs + 41 * 4);
 150       if (regnum == -1 || regnum == HPPA_SR5_REGNUM)
 151         regcache->raw_collect (HPPA_SR5_REGNUM, regs + 42 * 4);
 152       if (regnum == -1 || regnum == HPPA_SR6_REGNUM)
 153         regcache->raw_collect (HPPA_SR6_REGNUM, regs + 43 * 4);
 154       if (regnum == -1 || regnum == HPPA_SR7_REGNUM)
 155         regcache->raw_collect (HPPA_SR7_REGNUM, regs + 44 * 4);
 156       if (regnum == -1 || regnum == HPPA_CR26_REGNUM)
 157         regcache->raw_collect (HPPA_CR26_REGNUM, regs + 45 * 4);
 158       if (regnum == -1 || regnum == HPPA_CR27_REGNUM)
 159         regcache->raw_collect (HPPA_CR27_REGNUM, regs + 46 * 4);
 160     }
 161   else
 162     {
 163       if (regnum == -1 || regnum == HPPA_SAR_REGNUM)
 164         regcache->raw_collect (HPPA_SAR_REGNUM, regs);
 165       if (regnum == -1 || regnum == HPPA_PCOQ_HEAD_REGNUM)
 166         regcache->raw_collect (HPPA_PCOQ_HEAD_REGNUM, regs + 32 * 4);
 167       if (regnum == -1 || regnum == HPPA_PCOQ_TAIL_REGNUM)
 168         regcache->raw_collect (HPPA_PCOQ_TAIL_REGNUM, regs + 33 * 4);
 169     }
 170 }
 171
 172 /* Collect the floating-point registers from REGCACHE and store them
 173    in FPREGS.  */
 174
 175 static void
 176 hppaobsd_collect_fpregset (struct regcache *regcache,
 177                            void *fpregs, int regnum)
 178 {
 179   char *regs = fpregs;
 180   int i;
 181
 182   for (i = HPPA_FP0_REGNUM; i <= HPPA_FP31R_REGNUM; i += 2, regs += 8)
 183     {
 184       if (regnum == -1 || regnum == i || regnum == i + 1)
 185         {
 186           regcache->raw_collect (i, regs);
 187           regcache->raw_collect (i + 1, regs + 4);
 188         }
 189     }
 190 }
 191 \f
 192
 193 /* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
 194    for all registers (including the floating-point registers).  */
 195
 196 void
 197 hppa_obsd_nat_target::fetch_registers (struct regcache *regcache, int regnum)
 198 {
 199   pid_t pid = regcache->ptid ().pid ();
 200
 201   if (regnum == -1 || hppaobsd_gregset_supplies_p (regnum))
 202     {
 203       struct reg regs;
 204
 205       if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 206         perror_with_name (_("Couldn't get registers"));
 207
 208       hppaobsd_supply_gregset (regcache, &regs);
 209     }
 210
 211   if (regnum == -1 || hppaobsd_fpregset_supplies_p (regnum))
 212     {
 213       struct fpreg fpregs;
 214
 215       if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 216         perror_with_name (_("Couldn't get floating point status"));
 217
 218       hppaobsd_supply_fpregset (regcache, &fpregs);
 219     }
 220 }
 221
 222 /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
 223    this for all registers (including the floating-point registers).  */
 224
 225 void
 226 hppa_obsd_nat_target::store_registers (struct regcache *regcache, int regnum)
 227 {
 228   if (regnum == -1 || hppaobsd_gregset_supplies_p (regnum))
 229     {
 230       struct reg regs;
 231
 232       if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 233         perror_with_name (_("Couldn't get registers"));
 234
 235       hppaobsd_collect_gregset (regcache, &regs, regnum);
 236
 237       if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 238         perror_with_name (_("Couldn't write registers"));
 239     }
 240
 241   if (regnum == -1 || hppaobsd_fpregset_supplies_p (regnum))
 242     {
 243       struct fpreg fpregs;
 244
 245       if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 246         perror_with_name (_("Couldn't get floating point status"));
 247
 248       hppaobsd_collect_fpregset (regcache, &fpregs, regnum);
 249
 250       if (ptrace (PT_SETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 251         perror_with_name (_("Couldn't write floating point status"));
 252     }
 253 }
 254
 255 void _initialize_hppaobsd_nat ();
 256 void
 257 _initialize_hppaobsd_nat ()
 258 {
 259   add_inf_child_target (&the_hppa_obsd_nat_target);
 260 }