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 (gregsetp)
  38      gregset_t *gregsetp;
  39 {
  40   supply_register (EAX_REGNUM, (char *) &(*gregsetp)[EAX]);
  41   supply_register (EDX_REGNUM, (char *) &(*gregsetp)[EDX]);
  42   supply_register (ECX_REGNUM, (char *) &(*gregsetp)[ECX]);
  43   supply_register (EBX_REGNUM, (char *) &(*gregsetp)[EBX]);
  44   supply_register (ESI_REGNUM, (char *) &(*gregsetp)[ESI]);
  45   supply_register (EDI_REGNUM, (char *) &(*gregsetp)[EDI]);
  46   supply_register (ESP_REGNUM, (char *) &(*gregsetp)[UESP]);
  47   supply_register (EBP_REGNUM, (char *) &(*gregsetp)[EBP]);
  48   supply_register (EIP_REGNUM, (char *) &(*gregsetp)[EIP]);
  49   supply_register (EFLAGS_REGNUM, (char *) &(*gregsetp)[EFL]);
  50 }
  51
  52 void
  53 fill_gregset (gregsetp, regno)
  54      gregset_t *gregsetp;
  55      int regno;
  56 {
  57   int regi;
  58
  59   for (regi = 0; regi < NUM_REGS; regi++)
  60     {
  61       if ((regno == -1) || (regno == regi))
  62         {
  63           (*gregsetp)[regi] = *(greg_t *) & registers[REGISTER_BYTE (regi)];
  64         }
  65     }
  66 }
  67
  68 /*  Given a pointer to a floating point register set in /proc format
  69    (fpregset_t *), unpack the register contents and supply them as gdb's
  70    idea of the current floating point register values. */
  71
  72 void
  73 supply_fpregset (fpregsetp)
  74      fpregset_t *fpregsetp;
  75 {
  76   supply_fpu_registers ((struct fpusave *) &fpregsetp->fp_reg_set);
  77   supply_fpa_registers ((struct fpasave *) &fpregsetp->f_wregs);
  78 }
  79
  80 /*  Given a pointer to a floating point register set in /proc format
  81    (fpregset_t *), update the register specified by REGNO from gdb's idea
  82    of the current floating point register set.  If REGNO is -1, update
  83    them all. */
  84
  85 void
  86 fill_fpregset (fpregsetp, regno)
  87      fpregset_t *fpregsetp;
  88      int regno;
  89 {
  90   int regi;
  91   char *to;
  92   char *from;
  93
  94   /* FIXME: see m68k-tdep.c for an example, for the m68k. */
  95 }
  96
  97 /*
  98  * This doesn't quite do the same thing as the procfs.c version, but give
  99  * it the same name so we don't have to put an ifdef in solib.c.
 100  */
 101 /* this could use elf_interpreter() from elfread.c */
 102 int
 103 proc_iterate_over_mappings (func)
 104      int (*func) PARAMS ((int, CORE_ADDR));
 105 {
 106   vaddr_t curseg, memptr;
 107   pt_vseg_t pv;
 108   int rv, cmperr;
 109   sec_ptr interp_sec;
 110   char *interp_content;
 111   int interp_fd, funcstat;
 112   unsigned int size;
 113   char buf1[NBPG], buf2[NBPG];
 114
 115   /*
 116    * The following is really vile.  We can get the name of the
 117    * shared library from the exec_bfd, and we can get a list of
 118    * each virtual memory segment, but there is no simple way to
 119    * find the mapped segment from the shared library (ala
 120    * procfs's PIOCOPENMEM).  As a pretty nasty kludge, we
 121    * compare the virtual memory segment to the contents of the
 122    * .interp file.  If they match, we assume that we've got the
 123    * right one.
 124    */
 125
 126   /*
 127    * TODO: for attach, use XPT_OPENT to get the executable, in
 128    * case we're attached without knowning the executable's
 129    * filename.
 130    */
 131
 132 #ifdef VERBOSE_DEBUG
 133   printf ("proc_iter\n");
 134 #endif
 135   interp_sec = bfd_get_section_by_name (exec_bfd, ".interp");
 136   if (!interp_sec)
 137     {
 138       return 0;
 139     }
 140
 141   size = bfd_section_size (exec_bfd, interp_sec);
 142   interp_content = alloca (size);
 143   if (0 == bfd_get_section_contents (exec_bfd, interp_sec,
 144                                      interp_content, (file_ptr) 0, size))
 145     {
 146       return 0;
 147     }
 148
 149 #ifdef VERBOSE_DEBUG
 150   printf ("proc_iter: \"%s\"\n", interp_content);
 151 #endif
 152   interp_fd = open (interp_content, O_RDONLY, 0);
 153   if (-1 == interp_fd)
 154     {
 155       return 0;
 156     }
 157
 158   curseg = 0;
 159   while (1)
 160     {
 161       rv = ptrace (PT_NEXT_VSEG, inferior_pid, &pv, curseg);
 162 #ifdef VERBOSE_DEBUG
 163       printf ("PT_NEXT_VSEG: rv %d errno %d\n", rv, errno);
 164 #endif
 165       if (-1 == rv)
 166         break;
 167       if (0 == rv)
 168         break;
 169 #ifdef VERBOSE_DEBUG
 170       printf ("pv.pv_start 0x%x pv_size 0x%x pv_prot 0x%x\n",
 171               pv.pv_start, pv.pv_size, pv.pv_prot);
 172 #endif
 173       curseg = pv.pv_start + pv.pv_size;
 174
 175       rv = lseek (interp_fd, 0, SEEK_SET);
 176       if (-1 == rv)
 177         {
 178           perror ("lseek");
 179           close (interp_fd);
 180           return 0;
 181         }
 182       for (memptr = pv.pv_start; memptr < pv.pv_start + pv.pv_size;
 183            memptr += NBPG)
 184         {
 185 #ifdef VERBOSE_DEBUG
 186           printf ("memptr 0x%x\n", memptr);
 187 #endif
 188           rv = read (interp_fd, buf1, NBPG);
 189           if (-1 == rv)
 190             {
 191               perror ("read");
 192               close (interp_fd);
 193               return 0;
 194             }
 195           rv = ptrace (PT_RDATA_PAGE, inferior_pid, buf2,
 196                        memptr);
 197           if (-1 == rv)
 198             {
 199               perror ("ptrace");
 200               close (interp_fd);
 201               return 0;
 202             }
 203           cmperr = memcmp (buf1, buf2, NBPG);
 204           if (cmperr)
 205             break;
 206         }
 207       if (0 == cmperr)
 208         {
 209           /* this is it */
 210           funcstat = (*func) (interp_fd, pv.pv_start);
 211           break;
 212         }
 213     }
 214   close (interp_fd);
 215   return 0;
 216 }