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 /*  Given a pointer to a general register set in /proc format (gregset_t *),
  30    unpack the register contents and supply them as gdb's idea of the current
  31    register values. */
  32
  33 void
  34 supply_gregset (gregsetp)
  35      gregset_t *gregsetp;
  36 {
  37   supply_register (EAX_REGNUM, (char *) &(*gregsetp)[EAX]);
  38   supply_register (EDX_REGNUM, (char *) &(*gregsetp)[EDX]);
  39   supply_register (ECX_REGNUM, (char *) &(*gregsetp)[ECX]);
  40   supply_register (EBX_REGNUM, (char *) &(*gregsetp)[EBX]);
  41   supply_register (ESI_REGNUM, (char *) &(*gregsetp)[ESI]);
  42   supply_register (EDI_REGNUM, (char *) &(*gregsetp)[EDI]);
  43   supply_register (ESP_REGNUM, (char *) &(*gregsetp)[UESP]);
  44   supply_register (EBP_REGNUM, (char *) &(*gregsetp)[EBP]);
  45   supply_register (EIP_REGNUM, (char *) &(*gregsetp)[EIP]);
  46   supply_register (EFLAGS_REGNUM, (char *) &(*gregsetp)[EFL]);
  47 }
  48
  49 void
  50 fill_gregset (gregsetp, regno)
  51      gregset_t *gregsetp;
  52      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 (fpregsetp)
  71      fpregset_t *fpregsetp;
  72 {
  73   supply_fpu_registers ((struct fpusave *) &fpregsetp->fp_reg_set);
  74   supply_fpa_registers ((struct fpasave *) &fpregsetp->f_wregs);
  75 }
  76
  77 /*  Given a pointer to a floating point register set in /proc format
  78    (fpregset_t *), update the register specified by REGNO from gdb's idea
  79    of the current floating point register set.  If REGNO is -1, update
  80    them all. */
  81
  82 void
  83 fill_fpregset (fpregsetp, regno)
  84      fpregset_t *fpregsetp;
  85      int regno;
  86 {
  87   int regi;
  88   char *to;
  89   char *from;
  90
  91   /* FIXME: see m68k-tdep.c for an example, for the m68k. */
  92 }
  93
  94 /*
  95  * This doesn't quite do the same thing as the procfs.c version, but give
  96  * it the same name so we don't have to put an ifdef in solib.c.
  97  */
  98 /* this could use elf_interpreter() from elfread.c */
  99 int
 100 proc_iterate_over_mappings (func)
 101      int (*func) PARAMS ((int, CORE_ADDR));
 102 {
 103   vaddr_t curseg, memptr;
 104   pt_vseg_t pv;
 105   int rv, cmperr;
 106   sec_ptr interp_sec;
 107   char *interp_content;
 108   int interp_fd, funcstat;
 109   unsigned int size;
 110   char buf1[NBPG], buf2[NBPG];
 111
 112   /*
 113    * The following is really vile.  We can get the name of the
 114    * shared library from the exec_bfd, and we can get a list of
 115    * each virtual memory segment, but there is no simple way to
 116    * find the mapped segment from the shared library (ala
 117    * procfs's PIOCOPENMEM).  As a pretty nasty kludge, we
 118    * compare the virtual memory segment to the contents of the
 119    * .interp file.  If they match, we assume that we've got the
 120    * right one.
 121    */
 122
 123   /*
 124    * TODO: for attach, use XPT_OPENT to get the executable, in
 125    * case we're attached without knowning the executable's
 126    * filename.
 127    */
 128
 129 #ifdef VERBOSE_DEBUG
 130   printf ("proc_iter\n");
 131 #endif
 132   interp_sec = bfd_get_section_by_name (exec_bfd, ".interp");
 133   if (!interp_sec)
 134     {
 135       return 0;
 136     }
 137
 138   size = bfd_section_size (exec_bfd, interp_sec);
 139   interp_content = alloca (size);
 140   if (0 == bfd_get_section_contents (exec_bfd, interp_sec,
 141                                      interp_content, (file_ptr) 0, size))
 142     {
 143       return 0;
 144     }
 145
 146 #ifdef VERBOSE_DEBUG
 147   printf ("proc_iter: \"%s\"\n", interp_content);
 148 #endif
 149   interp_fd = open (interp_content, O_RDONLY, 0);
 150   if (-1 == interp_fd)
 151     {
 152       return 0;
 153     }
 154
 155   curseg = 0;
 156   while (1)
 157     {
 158       rv = ptrace (PT_NEXT_VSEG, inferior_pid, &pv, curseg);
 159 #ifdef VERBOSE_DEBUG
 160       printf ("PT_NEXT_VSEG: rv %d errno %d\n", rv, errno);
 161 #endif
 162       if (-1 == rv)
 163         break;
 164       if (0 == rv)
 165         break;
 166 #ifdef VERBOSE_DEBUG
 167       printf ("pv.pv_start 0x%x pv_size 0x%x pv_prot 0x%x\n",
 168               pv.pv_start, pv.pv_size, pv.pv_prot);
 169 #endif
 170       curseg = pv.pv_start + pv.pv_size;
 171
 172       rv = lseek (interp_fd, 0, SEEK_SET);
 173       if (-1 == rv)
 174         {
 175           perror ("lseek");
 176           close (interp_fd);
 177           return 0;
 178         }
 179       for (memptr = pv.pv_start; memptr < pv.pv_start + pv.pv_size;
 180            memptr += NBPG)
 181         {
 182 #ifdef VERBOSE_DEBUG
 183           printf ("memptr 0x%x\n", memptr);
 184 #endif
 185           rv = read (interp_fd, buf1, NBPG);
 186           if (-1 == rv)
 187             {
 188               perror ("read");
 189               close (interp_fd);
 190               return 0;
 191             }
 192           rv = ptrace (PT_RDATA_PAGE, inferior_pid, buf2,
 193                        memptr);
 194           if (-1 == rv)
 195             {
 196               perror ("ptrace");
 197               close (interp_fd);
 198               return 0;
 199             }
 200           cmperr = memcmp (buf1, buf2, NBPG);
 201           if (cmperr)
 202             break;
 203         }
 204       if (0 == cmperr)
 205         {
 206           /* this is it */
 207           funcstat = (*func) (interp_fd, pv.pv_start);
 208           break;
 209         }
 210     }
 211   close (interp_fd);
 212   return 0;
 213 }