gdb/ptx4-nat.c

   1 /* Native-dependent code for ptx 4.0
   2    Copyright 1988, 1989, 1991, 1992 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,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 #include "defs.h"
  22 #include "inferior.h"
  23 #include "gdbcore.h"
  24 #include <sys/procfs.h>
  25 #include <sys/ptrace.h>
  26 #include <sys/param.h>
  27 #include <fcntl.h>
  28
  29 /* Prototypes for supply_gregset etc. */
  30 #include "gregset.h"
  31
  32 /*  Given a pointer to a general register set in /proc format (gregset_t *),
  33    unpack the register contents and supply them as gdb's idea of the current
  34    register values. */
  35
  36 void
  37 supply_gregset (gregset_t *gregsetp)
  38 {
  39   supply_register (EAX_REGNUM, (char *) &(*gregsetp)[EAX]);
  40   supply_register (EDX_REGNUM, (char *) &(*gregsetp)[EDX]);
  41   supply_register (ECX_REGNUM, (char *) &(*gregsetp)[ECX]);
  42   supply_register (EBX_REGNUM, (char *) &(*gregsetp)[EBX]);
  43   supply_register (ESI_REGNUM, (char *) &(*gregsetp)[ESI]);
  44   supply_register (EDI_REGNUM, (char *) &(*gregsetp)[EDI]);
  45   supply_register (ESP_REGNUM, (char *) &(*gregsetp)[UESP]);
  46   supply_register (EBP_REGNUM, (char *) &(*gregsetp)[EBP]);
  47   supply_register (EIP_REGNUM, (char *) &(*gregsetp)[EIP]);
  48   supply_register (EFLAGS_REGNUM, (char *) &(*gregsetp)[EFL]);
  49 }
  50
  51 void
  52 fill_gregset (gregset_t *gregsetp, int regno)
  53 {
  54   int regi;
  55
  56   for (regi = 0; regi < NUM_REGS; regi++)
  57     {
  58       if ((regno == -1) || (regno == regi))
  59         {
  60           (*gregsetp)[regi] = *(greg_t *) & registers[REGISTER_BYTE (regi)];
  61         }
  62     }
  63 }
  64
  65 /*  Given a pointer to a floating point register set in /proc format
  66    (fpregset_t *), unpack the register contents and supply them as gdb's
  67    idea of the current floating point register values. */
  68
  69 void
  70 supply_fpregset (fpregset_t *fpregsetp)
  71 {
  72   supply_fpu_registers ((struct fpusave *) &fpregsetp->fp_reg_set);
  73   supply_fpa_registers ((struct fpasave *) &fpregsetp->f_wregs);
  74 }
  75
  76 /*  Given a pointer to a floating point register set in /proc format
  77    (fpregset_t *), update the register specified by REGNO from gdb's idea
  78    of the current floating point register set.  If REGNO is -1, update
  79    them all. */
  80
  81 void
  82 fill_fpregset (fpregset_t *fpregsetp, int regno)
  83 {
  84   int regi;
  85   char *to;
  86   char *from;
  87
  88   /* FIXME: see m68k-tdep.c for an example, for the m68k. */
  89 }
  90
  91 /*
  92  * This doesn't quite do the same thing as the procfs.c version, but give
  93  * it the same name so we don't have to put an ifdef in solib.c.
  94  */
  95 /* this could use elf_interpreter() from elfread.c */
  96 int
  97 proc_iterate_over_mappings (int (*func) (int, CORE_ADDR))
  98 {
  99   vaddr_t curseg, memptr;
 100   pt_vseg_t pv;
 101   int rv, cmperr;
 102   sec_ptr interp_sec;
 103   char *interp_content;
 104   int interp_fd, funcstat;
 105   unsigned int size;
 106   char buf1[NBPG], buf2[NBPG];
 107
 108   /*
 109    * The following is really vile.  We can get the name of the
 110    * shared library from the exec_bfd, and we can get a list of
 111    * each virtual memory segment, but there is no simple way to
 112    * find the mapped segment from the shared library (ala
 113    * procfs's PIOCOPENMEM).  As a pretty nasty kludge, we
 114    * compare the virtual memory segment to the contents of the
 115    * .interp file.  If they match, we assume that we've got the
 116    * right one.
 117    */
 118
 119   /*
 120    * TODO: for attach, use XPT_OPENT to get the executable, in
 121    * case we're attached without knowning the executable's
 122    * filename.
 123    */
 124
 125 #ifdef VERBOSE_DEBUG
 126   printf ("proc_iter\n");
 127 #endif
 128   interp_sec = bfd_get_section_by_name (exec_bfd, ".interp");
 129   if (!interp_sec)
 130     {
 131       return 0;
 132     }
 133
 134   size = bfd_section_size (exec_bfd, interp_sec);
 135   interp_content = alloca (size);
 136   if (0 == bfd_get_section_contents (exec_bfd, interp_sec,
 137                                      interp_content, (file_ptr) 0, size))
 138     {
 139       return 0;
 140     }
 141
 142 #ifdef VERBOSE_DEBUG
 143   printf ("proc_iter: \"%s\"\n", interp_content);
 144 #endif
 145   interp_fd = open (interp_content, O_RDONLY, 0);
 146   if (-1 == interp_fd)
 147     {
 148       return 0;
 149     }
 150
 151   curseg = 0;
 152   while (1)
 153     {
 154       rv = ptrace (PT_NEXT_VSEG, inferior_pid, &pv, curseg);
 155 #ifdef VERBOSE_DEBUG
 156       printf ("PT_NEXT_VSEG: rv %d errno %d\n", rv, errno);
 157 #endif
 158       if (-1 == rv)
 159         break;
 160       if (0 == rv)
 161         break;
 162 #ifdef VERBOSE_DEBUG
 163       printf ("pv.pv_start 0x%x pv_size 0x%x pv_prot 0x%x\n",
 164               pv.pv_start, pv.pv_size, pv.pv_prot);
 165 #endif
 166       curseg = pv.pv_start + pv.pv_size;
 167
 168       rv = lseek (interp_fd, 0, SEEK_SET);
 169       if (-1 == rv)
 170         {
 171           perror ("lseek");
 172           close (interp_fd);
 173           return 0;
 174         }
 175       for (memptr = pv.pv_start; memptr < pv.pv_start + pv.pv_size;
 176            memptr += NBPG)
 177         {
 178 #ifdef VERBOSE_DEBUG
 179           printf ("memptr 0x%x\n", memptr);
 180 #endif
 181           rv = read (interp_fd, buf1, NBPG);
 182           if (-1 == rv)
 183             {
 184               perror ("read");
 185               close (interp_fd);
 186               return 0;
 187             }
 188           rv = ptrace (PT_RDATA_PAGE, inferior_pid, buf2,
 189                        memptr);
 190           if (-1 == rv)
 191             {
 192               perror ("ptrace");
 193               close (interp_fd);
 194               return 0;
 195             }
 196           cmperr = memcmp (buf1, buf2, NBPG);
 197           if (cmperr)
 198             break;
 199         }
 200       if (0 == cmperr)
 201         {
 202           /* this is it */
 203           funcstat = (*func) (interp_fd, pv.pv_start);
 204           break;
 205         }
 206     }
 207   close (interp_fd);
 208   return 0;
 209 }