gdb/hppa-obsd-nat.c

   1 /* Native-dependent code for OpenBSD/hppa.
   2
   3    Copyright (C) 2004-2018 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 static int
  35 hppaobsd_gregset_supplies_p (int regnum)
  36 {
  37   return (regnum >= HPPA_R0_REGNUM && regnum <= HPPA_CR27_REGNUM);
  38 }
  39
  40 static int
  41 hppaobsd_fpregset_supplies_p (int regnum)
  42 {
  43   return (regnum >= HPPA_FP0_REGNUM && regnum <= HPPA_FP31R_REGNUM);
  44 }
  45
  46 /* Supply the general-purpose registers stored in GREGS to REGCACHE.  */
  47
  48 static void
  49 hppaobsd_supply_gregset (struct regcache *regcache, const void *gregs)
  50 {
  51   gdb_byte zero[4] = { 0 };
  52   const char *regs = gregs;
  53   int regnum;
  54
  55   regcache_raw_supply (regcache, HPPA_R0_REGNUM, &zero);
  56   for (regnum = HPPA_R1_REGNUM; regnum <= HPPA_R31_REGNUM; regnum++)
  57     regcache_raw_supply (regcache, regnum, regs + regnum * 4);
  58
  59   if (sizeof(struct reg) >= 46 * 4)
  60     {
  61       regcache_raw_supply (regcache, HPPA_IPSW_REGNUM, regs);
  62       regcache_raw_supply (regcache, HPPA_SAR_REGNUM, regs + 32 * 4);
  63       regcache_raw_supply (regcache, HPPA_PCSQ_HEAD_REGNUM, regs + 33 * 4);
  64       regcache_raw_supply (regcache, HPPA_PCSQ_TAIL_REGNUM, regs + 34 * 4);
  65       regcache_raw_supply (regcache, HPPA_PCOQ_HEAD_REGNUM, regs + 35 * 4);
  66       regcache_raw_supply (regcache, HPPA_PCOQ_TAIL_REGNUM, regs + 36 * 4);
  67       regcache_raw_supply (regcache, HPPA_SR0_REGNUM, regs + 37 * 4);
  68       regcache_raw_supply (regcache, HPPA_SR1_REGNUM, regs + 38 * 4);
  69       regcache_raw_supply (regcache, HPPA_SR2_REGNUM, regs + 39 * 4);
  70       regcache_raw_supply (regcache, HPPA_SR3_REGNUM, regs + 40 * 4);
  71       regcache_raw_supply (regcache, HPPA_SR4_REGNUM, regs + 41 * 4);
  72       regcache_raw_supply (regcache, HPPA_SR5_REGNUM, regs + 42 * 4);
  73       regcache_raw_supply (regcache, HPPA_SR6_REGNUM, regs + 43 * 4);
  74       regcache_raw_supply (regcache, HPPA_SR7_REGNUM, regs + 44 * 4);
  75       regcache_raw_supply (regcache, HPPA_CR26_REGNUM, regs + 45 * 4);
  76       regcache_raw_supply (regcache, HPPA_CR27_REGNUM, regs + 46 * 4);
  77     }
  78   else
  79     {
  80       regcache_raw_supply (regcache, HPPA_SAR_REGNUM, regs);
  81       regcache_raw_supply (regcache, HPPA_PCOQ_HEAD_REGNUM, regs + 32 * 4);
  82       regcache_raw_supply (regcache, HPPA_PCOQ_TAIL_REGNUM, regs + 33 * 4);
  83     }
  84 }
  85
  86 /* Supply the floating-point registers stored in FPREGS to REGCACHE.  */
  87
  88 static void
  89 hppaobsd_supply_fpregset (struct regcache *regcache, const void *fpregs)
  90 {
  91   const char *regs = fpregs;
  92   int regnum;
  93
  94   for (regnum = HPPA_FP0_REGNUM; regnum <= HPPA_FP31R_REGNUM;
  95        regnum += 2, regs += 8)
  96     {
  97       regcache_raw_supply (regcache, regnum, regs);
  98       regcache_raw_supply (regcache, regnum + 1, regs + 4);
  99     }
 100 }
 101
 102 /* Collect the general-purpose registers from REGCACHE and store them
 103    in GREGS.  */
 104
 105 static void
 106 hppaobsd_collect_gregset (const struct regcache *regcache,
 107                           void *gregs, int regnum)
 108 {
 109   char *regs = gregs;
 110   int i;
 111
 112   for (i = HPPA_R1_REGNUM; i <= HPPA_R31_REGNUM; i++)
 113     {
 114       if (regnum == -1 || regnum == i)
 115         regcache_raw_collect (regcache, i, regs + i * 4);
 116     }
 117
 118   if (sizeof(struct reg) >= 46 * 4)
 119     {
 120       if (regnum == -1 || regnum == HPPA_IPSW_REGNUM)
 121         regcache_raw_collect (regcache, HPPA_IPSW_REGNUM, regs);
 122       if (regnum == -1 || regnum == HPPA_SAR_REGNUM)
 123         regcache_raw_collect (regcache, HPPA_SAR_REGNUM, regs + 32 * 4);
 124       if (regnum == -1 || regnum == HPPA_PCSQ_HEAD_REGNUM)
 125         regcache_raw_collect (regcache, HPPA_PCSQ_HEAD_REGNUM, regs + 33 * 4);
 126       if (regnum == -1 || regnum == HPPA_PCSQ_TAIL_REGNUM)
 127         regcache_raw_collect (regcache, HPPA_PCSQ_TAIL_REGNUM, regs + 34 * 4);
 128       if (regnum == -1 || regnum == HPPA_PCOQ_HEAD_REGNUM)
 129         regcache_raw_collect (regcache, HPPA_PCOQ_HEAD_REGNUM, regs + 35 * 4);
 130       if (regnum == -1 || regnum == HPPA_PCOQ_TAIL_REGNUM)
 131         regcache_raw_collect (regcache, HPPA_PCOQ_TAIL_REGNUM, regs + 36 * 4);
 132       if (regnum == -1 || regnum == HPPA_SR0_REGNUM)
 133         regcache_raw_collect (regcache, HPPA_SR0_REGNUM, regs + 37 * 4);
 134       if (regnum == -1 || regnum == HPPA_SR1_REGNUM)
 135         regcache_raw_collect (regcache, HPPA_SR1_REGNUM, regs + 38 * 4);
 136       if (regnum == -1 || regnum == HPPA_SR2_REGNUM)
 137         regcache_raw_collect (regcache, HPPA_SR2_REGNUM, regs + 39 * 4);
 138       if (regnum == -1 || regnum == HPPA_SR3_REGNUM)
 139         regcache_raw_collect (regcache, HPPA_SR3_REGNUM, regs + 40 * 4);
 140       if (regnum == -1 || regnum == HPPA_SR4_REGNUM)
 141         regcache_raw_collect (regcache, HPPA_SR4_REGNUM, regs + 41 * 4);
 142       if (regnum == -1 || regnum == HPPA_SR5_REGNUM)
 143         regcache_raw_collect (regcache, HPPA_SR5_REGNUM, regs + 42 * 4);
 144       if (regnum == -1 || regnum == HPPA_SR6_REGNUM)
 145         regcache_raw_collect (regcache, HPPA_SR6_REGNUM, regs + 43 * 4);
 146       if (regnum == -1 || regnum == HPPA_SR7_REGNUM)
 147         regcache_raw_collect (regcache, HPPA_SR7_REGNUM, regs + 44 * 4);
 148       if (regnum == -1 || regnum == HPPA_CR26_REGNUM)
 149         regcache_raw_collect (regcache, HPPA_CR26_REGNUM, regs + 45 * 4);
 150       if (regnum == -1 || regnum == HPPA_CR27_REGNUM)
 151         regcache_raw_collect (regcache, HPPA_CR27_REGNUM, regs + 46 * 4);
 152     }
 153   else
 154     {
 155       if (regnum == -1 || regnum == HPPA_SAR_REGNUM)
 156         regcache_raw_collect (regcache, HPPA_SAR_REGNUM, regs);
 157       if (regnum == -1 || regnum == HPPA_PCOQ_HEAD_REGNUM)
 158         regcache_raw_collect (regcache, HPPA_PCOQ_HEAD_REGNUM, regs + 32 * 4);
 159       if (regnum == -1 || regnum == HPPA_PCOQ_TAIL_REGNUM)
 160         regcache_raw_collect (regcache, HPPA_PCOQ_TAIL_REGNUM, regs + 33 * 4);
 161     }
 162 }
 163
 164 /* Collect the floating-point registers from REGCACHE and store them
 165    in FPREGS.  */
 166
 167 static void
 168 hppaobsd_collect_fpregset (struct regcache *regcache,
 169                            void *fpregs, int regnum)
 170 {
 171   char *regs = fpregs;
 172   int i;
 173
 174   for (i = HPPA_FP0_REGNUM; i <= HPPA_FP31R_REGNUM; i += 2, regs += 8)
 175     {
 176       if (regnum == -1 || regnum == i || regnum == i + 1)
 177         {
 178           regcache_raw_collect (regcache, i, regs);
 179           regcache_raw_collect (regcache, i + 1, regs + 4);
 180         }
 181     }
 182 }
 183 \f
 184
 185 /* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
 186    for all registers (including the floating-point registers).  */
 187
 188 static void
 189 hppaobsd_fetch_registers (struct target_ops *ops,
 190                           struct regcache *regcache, int regnum)
 191 {
 192   pid_t pid = ptid_get_pid (regcache_get_ptid (regcache));
 193
 194   if (regnum == -1 || hppaobsd_gregset_supplies_p (regnum))
 195     {
 196       struct reg regs;
 197
 198       if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 199         perror_with_name (_("Couldn't get registers"));
 200
 201       hppaobsd_supply_gregset (regcache, &regs);
 202     }
 203
 204   if (regnum == -1 || hppaobsd_fpregset_supplies_p (regnum))
 205     {
 206       struct fpreg fpregs;
 207
 208       if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 209         perror_with_name (_("Couldn't get floating point status"));
 210
 211       hppaobsd_supply_fpregset (regcache, &fpregs);
 212     }
 213 }
 214
 215 /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
 216    this for all registers (including the floating-point registers).  */
 217
 218 static void
 219 hppaobsd_store_registers (struct target_ops *ops,
 220                           struct regcache *regcache, int regnum)
 221 {
 222   if (regnum == -1 || hppaobsd_gregset_supplies_p (regnum))
 223     {
 224       struct reg regs;
 225
 226       if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 227         perror_with_name (_("Couldn't get registers"));
 228
 229       hppaobsd_collect_gregset (regcache, &regs, regnum);
 230
 231       if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 232         perror_with_name (_("Couldn't write registers"));
 233     }
 234
 235   if (regnum == -1 || hppaobsd_fpregset_supplies_p (regnum))
 236     {
 237       struct fpreg fpregs;
 238
 239       if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 240         perror_with_name (_("Couldn't get floating point status"));
 241
 242       hppaobsd_collect_fpregset (regcache, &fpregs, regnum);
 243
 244       if (ptrace (PT_SETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 245         perror_with_name (_("Couldn't write floating point status"));
 246     }
 247 }
 248
 249 void
 250 _initialize_hppaobsd_nat (void)
 251 {
 252   struct target_ops *t;
 253
 254   t = inf_ptrace_target ();
 255   t->to_fetch_registers = hppaobsd_fetch_registers;
 256   t->to_store_registers = hppaobsd_store_registers;
 257   obsd_add_target (t);
 258 }