gdb/hppa-obsd-nat.c

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