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., 675 Mass Ave, Cambridge, MA 02139, 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 <sys/dir.h>
  28 #include <signal.h>
  29 #include <sys/user.h>
  30 #include <sys/ioctl.h>
  31 #include <fcntl.h>
  32
  33 #include <sys/ptrace.h>
  34 #include <sys/reg.h>
  35 #include <sys/trap.h>
  36
  37 #include "gdbcore.h"
  38
  39 #include <sys/file.h>
  40 #include <sys/stat.h>
  41
  42 /* Get kernel_u_addr using HPUX-style nlist().  */
  43 CORE_ADDR kernel_u_addr;
  44
  45 struct hpnlist {
  46         char *          n_name;
  47         long            n_value;
  48         unsigned char   n_type;
  49         unsigned char   n_length;
  50         short           n_almod;
  51         short           n_unused;
  52 };
  53 static struct hpnlist nl[] = {{ "_u", -1, }, { (char *) 0, }};
  54
  55 /* read the value of the u area from the hp-ux kernel */
  56 void _initialize_kernel_u_addr ()
  57 {
  58 #ifndef HPUX_VERSION_5
  59     nlist ("/hp-ux", nl);
  60     kernel_u_addr = nl[0].n_value;
  61 #else /* HPUX version 5.  */
  62     kernel_u_addr = (CORE_ADDR) 0x0097900;
  63 #endif
  64 }
  65
  66 #define INFERIOR_AR0(u)                                                 \
  67   ((ptrace                                                              \
  68     (PT_RUAREA, inferior_pid,                                           \
  69      (PTRACE_ARG3_TYPE) ((char *) &u.u_ar0 - (char *) &u), 0, 0))               \
  70    - kernel_u_addr)
  71
  72 static void
  73 fetch_inferior_register (regno, regaddr)
  74      register int regno;
  75      register unsigned int regaddr;
  76 {
  77 #ifndef HPUX_VERSION_5
  78   if (regno == PS_REGNUM)
  79     {
  80       union { int i; short s[2]; } ps_val;
  81       int regval;
  82
  83       ps_val.i = (ptrace (PT_RUAREA, inferior_pid, (PTRACE_ARG3_TYPE) regaddr,
  84                           0, 0));
  85       regval = ps_val.s[0];
  86       supply_register (regno, (char *)&regval);
  87     }
  88   else
  89 #endif /* not HPUX_VERSION_5 */
  90     {
  91       char buf[MAX_REGISTER_RAW_SIZE];
  92       register int i;
  93
  94       for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int))
  95         {
  96           *(int *) &buf[i] = ptrace (PT_RUAREA, inferior_pid,
  97                                      (PTRACE_ARG3_TYPE) regaddr, 0, 0);
  98           regaddr += sizeof (int);
  99         }
 100       supply_register (regno, buf);
 101     }
 102   return;
 103 }
 104
 105 static void
 106 store_inferior_register_1 (regno, regaddr, val)
 107      int regno;
 108      unsigned int regaddr;
 109      int val;
 110 {
 111   errno = 0;
 112   ptrace (PT_WUAREA, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, val, 0);
 113 #if 0
 114   /* HP-UX randomly sets errno to non-zero for regno == 25.
 115      However, the value is correctly written, so ignore errno. */
 116   if (errno != 0)
 117     {
 118       char string_buf[64];
 119
 120       sprintf (string_buf, "writing register number %d", regno);
 121       perror_with_name (string_buf);
 122     }
 123 #endif
 124   return;
 125 }
 126
 127 static void
 128 store_inferior_register (regno, regaddr)
 129      register int regno;
 130      register unsigned int regaddr;
 131 {
 132 #ifndef HPUX_VERSION_5
 133   if (regno == PS_REGNUM)
 134     {
 135       union { int i; short s[2]; } ps_val;
 136
 137       ps_val.i = (ptrace (PT_RUAREA, inferior_pid, (PTRACE_ARG3_TYPE) regaddr,
 138                           0, 0));
 139       ps_val.s[0] = (read_register (regno));
 140       store_inferior_register_1 (regno, regaddr, ps_val.i);
 141     }
 142   else
 143 #endif /* not HPUX_VERSION_5 */
 144     {
 145       char buf[MAX_REGISTER_RAW_SIZE];
 146       register int i;
 147       extern char registers[];
 148
 149       for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int))
 150         {
 151           store_inferior_register_1
 152             (regno, regaddr,
 153              (*(int *) &registers[(REGISTER_BYTE (regno)) + i]));
 154           regaddr += sizeof (int);
 155         }
 156     }
 157   return;
 158 }
 159
 160 void
 161 fetch_inferior_registers (regno)
 162      int regno;
 163 {
 164   struct user u;
 165   register unsigned int ar0_offset;
 166
 167   ar0_offset = (INFERIOR_AR0 (u));
 168   if (regno == -1)
 169     {
 170       for (regno = 0; (regno < FP0_REGNUM); regno++)
 171         fetch_inferior_register (regno, (REGISTER_ADDR (ar0_offset, regno)));
 172       for (; (regno < NUM_REGS); regno++)
 173         fetch_inferior_register (regno, (FP_REGISTER_ADDR (u, regno)));
 174     }
 175   else
 176     fetch_inferior_register (regno,
 177                              (regno < FP0_REGNUM
 178                               ? REGISTER_ADDR (ar0_offset, regno)
 179                               : FP_REGISTER_ADDR (u, regno)));
 180 }
 181
 182 /* Store our register values back into the inferior.
 183    If REGNO is -1, do this for all registers.
 184    Otherwise, REGNO specifies which register (so we can save time).  */
 185
 186 void
 187 store_inferior_registers (regno)
 188      register int regno;
 189 {
 190   struct user u;
 191   register unsigned int ar0_offset;
 192   extern char registers[];
 193
 194   if (regno >= FP0_REGNUM)
 195     {
 196       store_inferior_register (regno, (FP_REGISTER_ADDR (u, regno)));
 197       return;
 198     }
 199
 200   ar0_offset = (INFERIOR_AR0 (u));
 201   if (regno >= 0)
 202     {
 203       store_inferior_register (regno, (REGISTER_ADDR (ar0_offset, regno)));
 204       return;
 205     }
 206
 207   for (regno = 0; (regno < FP0_REGNUM); regno++)
 208     store_inferior_register (regno, (REGISTER_ADDR (ar0_offset, regno)));
 209   for (; (regno < NUM_REGS); regno++)
 210     store_inferior_register (regno, (FP_REGISTER_ADDR (u, regno)));
 211   return;
 212 }
 213
 214 \f
 215 /* Take the register values out of a core file and store
 216    them where `read_register' will find them.  */
 217
 218 #ifdef HPUX_VERSION_5
 219 #define e_PS e_regs[PS]
 220 #define e_PC e_regs[PC]
 221 #endif /* HPUX_VERSION_5 */
 222
 223 void
 224 fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
 225      char *core_reg_sect;
 226      unsigned int core_reg_size;
 227      int which;
 228      unsigned int reg_addr;     /* Unused in this version */
 229 {
 230   int val, regno;
 231   struct user u;
 232   struct exception_stack *pes = (struct exception_stack *) core_reg_sect;
 233 #define es (*pes)
 234   char *buf;
 235
 236   if (which == 0) {
 237     if (core_reg_size <
 238                   ((char *) &es.e_offset - (char *) &es.e_regs[R0]))
 239           error ("Not enough registers in core file");
 240     for (regno = 0; (regno < PS_REGNUM); regno++)
 241       supply_register (regno, (char *) &es.e_regs[regno + R0]);
 242     val = es.e_PS;
 243     supply_register (regno++, (char *) &val);
 244     supply_register (regno++, (char *) &es.e_PC);
 245
 246   } else if (which == 2) {
 247
 248     /* FIXME: This may not work if the float regs and control regs are
 249        discontinuous.  */
 250     for (regno = FP0_REGNUM, buf = core_reg_sect;
 251          (regno < NUM_REGS);
 252          buf += REGISTER_RAW_SIZE (regno), regno++)
 253       {
 254         supply_register (regno, buf);
 255       }
 256   }
 257 }
 258
 259 int
 260 getpagesize ()
 261 {
 262   return 4096;
 263 }