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