gdb/hp300ux-nat.c

   1 /* HP/UX native interface for HP 300's, for GDB when running under Unix.
   2    Copyright 1986, 1987, 1989, 1991, 1992, 1993 Free Software Foundation, Inc.
   3
   4 This file is part of GDB.
   5
   6 This program is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2 of the License, or
   9 (at your option) any later version.
  10
  11 This program is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with this program; if not, write to the Free Software
  18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  19
  20 #include "defs.h"
  21 #include "frame.h"
  22 #include "inferior.h"
  23
  24 /* Defining this means some system include files define some extra stuff.  */
  25 #define WOPR
  26 #include <sys/param.h>
  27 #include <signal.h>
  28 #include <sys/user.h>
  29 #include <fcntl.h>
  30
  31 #include <sys/ptrace.h>
  32 #include <sys/reg.h>
  33 #include <sys/trap.h>
  34
  35 #include "gdbcore.h"
  36
  37 #include <sys/file.h>
  38
  39 /* Get kernel_u_addr using HPUX-style nlist().  */
  40 CORE_ADDR kernel_u_addr;
  41
  42 struct hpnlist {
  43         char *          n_name;
  44         long            n_value;
  45         unsigned char   n_type;
  46         unsigned char   n_length;
  47         short           n_almod;
  48         short           n_unused;
  49 };
  50 static struct hpnlist nl[] = {{ "_u", -1, }, { (char *) 0, }};
  51
  52 /* read the value of the u area from the hp-ux kernel */
  53 void
  54 _initialize_hp300ux_nat ()
  55 {
  56 #ifndef HPUX_VERSION_5
  57     nlist ("/hp-ux", nl);
  58     kernel_u_addr = nl[0].n_value;
  59 #else /* HPUX version 5.  */
  60     kernel_u_addr = (CORE_ADDR) 0x0097900;
  61 #endif
  62 }
  63
  64 #define INFERIOR_AR0(u)                                                 \
  65   ((ptrace                                                              \
  66     (PT_RUAREA, inferior_pid,                                           \
  67      (PTRACE_ARG3_TYPE) ((char *) &u.u_ar0 - (char *) &u), 0, 0))               \
  68    - kernel_u_addr)
  69
  70 static void
  71 fetch_inferior_register (regno, regaddr)
  72      register int regno;
  73      register unsigned int regaddr;
  74 {
  75 #ifndef HPUX_VERSION_5
  76   if (regno == PS_REGNUM)
  77     {
  78       union { int i; short s[2]; } ps_val;
  79       int regval;
  80
  81       ps_val.i = (ptrace (PT_RUAREA, inferior_pid, (PTRACE_ARG3_TYPE) regaddr,
  82                           0, 0));
  83       regval = ps_val.s[0];
  84       supply_register (regno, (char *)&regval);
  85     }
  86   else
  87 #endif /* not HPUX_VERSION_5 */
  88     {
  89       char buf[MAX_REGISTER_RAW_SIZE];
  90       register int i;
  91
  92       for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int))
  93         {
  94           *(int *) &buf[i] = ptrace (PT_RUAREA, inferior_pid,
  95                                      (PTRACE_ARG3_TYPE) regaddr, 0, 0);
  96           regaddr += sizeof (int);
  97         }
  98       supply_register (regno, buf);
  99     }
 100   return;
 101 }
 102
 103 static void
 104 store_inferior_register_1 (regno, regaddr, val)
 105      int regno;
 106      unsigned int regaddr;
 107      int val;
 108 {
 109   errno = 0;
 110   ptrace (PT_WUAREA, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, val, 0);
 111 #if 0
 112   /* HP-UX randomly sets errno to non-zero for regno == 25.
 113      However, the value is correctly written, so ignore errno. */
 114   if (errno != 0)
 115     {
 116       char string_buf[64];
 117
 118       sprintf (string_buf, "writing register number %d", regno);
 119       perror_with_name (string_buf);
 120     }
 121 #endif
 122   return;
 123 }
 124
 125 static void
 126 store_inferior_register (regno, regaddr)
 127      register int regno;
 128      register unsigned int regaddr;
 129 {
 130 #ifndef HPUX_VERSION_5
 131   if (regno == PS_REGNUM)
 132     {
 133       union { int i; short s[2]; } ps_val;
 134
 135       ps_val.i = (ptrace (PT_RUAREA, inferior_pid, (PTRACE_ARG3_TYPE) regaddr,
 136                           0, 0));
 137       ps_val.s[0] = (read_register (regno));
 138       store_inferior_register_1 (regno, regaddr, ps_val.i);
 139     }
 140   else
 141 #endif /* not HPUX_VERSION_5 */
 142     {
 143       char buf[MAX_REGISTER_RAW_SIZE];
 144       register int i;
 145       extern char registers[];
 146
 147       for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int))
 148         {
 149           store_inferior_register_1
 150             (regno, regaddr,
 151              (*(int *) &registers[(REGISTER_BYTE (regno)) + i]));
 152           regaddr += sizeof (int);
 153         }
 154     }
 155   return;
 156 }
 157
 158 void
 159 fetch_inferior_registers (regno)
 160      int regno;
 161 {
 162   struct user u;
 163   register unsigned int ar0_offset;
 164
 165   ar0_offset = (INFERIOR_AR0 (u));
 166   if (regno == -1)
 167     {
 168       for (regno = 0; (regno < FP0_REGNUM); regno++)
 169         fetch_inferior_register (regno, (REGISTER_ADDR (ar0_offset, regno)));
 170       for (; (regno < NUM_REGS); regno++)
 171         fetch_inferior_register (regno, (FP_REGISTER_ADDR (u, regno)));
 172     }
 173   else
 174     fetch_inferior_register (regno,
 175                              (regno < FP0_REGNUM
 176                               ? REGISTER_ADDR (ar0_offset, regno)
 177                               : FP_REGISTER_ADDR (u, regno)));
 178 }
 179
 180 /* Store our register values back into the inferior.
 181    If REGNO is -1, do this for all registers.
 182    Otherwise, REGNO specifies which register (so we can save time).  */
 183
 184 void
 185 store_inferior_registers (regno)
 186      register int regno;
 187 {
 188   struct user u;
 189   register unsigned int ar0_offset;
 190   extern char registers[];
 191
 192   if (regno >= FP0_REGNUM)
 193     {
 194       store_inferior_register (regno, (FP_REGISTER_ADDR (u, regno)));
 195       return;
 196     }
 197
 198   ar0_offset = (INFERIOR_AR0 (u));
 199   if (regno >= 0)
 200     {
 201       store_inferior_register (regno, (REGISTER_ADDR (ar0_offset, regno)));
 202       return;
 203     }
 204
 205   for (regno = 0; (regno < FP0_REGNUM); regno++)
 206     store_inferior_register (regno, (REGISTER_ADDR (ar0_offset, regno)));
 207   for (; (regno < NUM_REGS); regno++)
 208     store_inferior_register (regno, (FP_REGISTER_ADDR (u, regno)));
 209   return;
 210 }
 211
 212 \f
 213 #if 0
 214
 215 /* This function is no longer used.  The version in coredep.c is used
 216    instead.  */
 217
 218 /* Take the register values out of a core file and store
 219    them where `read_register' will find them.  */
 220
 221 #ifdef HPUX_VERSION_5
 222 #define e_PS e_regs[PS]
 223 #define e_PC e_regs[PC]
 224 #endif /* HPUX_VERSION_5 */
 225
 226 void
 227 fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
 228      char *core_reg_sect;
 229      unsigned int core_reg_size;
 230      int which;
 231      unsigned int reg_addr;     /* Unused in this version */
 232 {
 233   int val, regno;
 234   struct user u;
 235   struct exception_stack *pes = (struct exception_stack *) core_reg_sect;
 236 #define es (*pes)
 237   char *buf;
 238
 239   if (which == 0) {
 240     if (core_reg_size <
 241                   ((char *) &es.e_offset - (char *) &es.e_regs[R0]))
 242           error ("Not enough registers in core file");
 243     for (regno = 0; (regno < PS_REGNUM); regno++)
 244       supply_register (regno, (char *) &es.e_regs[regno + R0]);
 245     val = es.e_PS;
 246     supply_register (regno++, (char *) &val);
 247     supply_register (regno++, (char *) &es.e_PC);
 248
 249   } else if (which == 2) {
 250
 251     /* FIXME: This may not work if the float regs and control regs are
 252        discontinuous.  */
 253     for (regno = FP0_REGNUM, buf = core_reg_sect;
 254          (regno < NUM_REGS);
 255          buf += REGISTER_RAW_SIZE (regno), regno++)
 256       {
 257         supply_register (regno, buf);
 258       }
 259   }
 260 }
 261
 262 #endif /* 0 */
 263
 264 int
 265 getpagesize ()
 266 {
 267   return 4096;
 268 }