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 #if defined (FP0_REGNUM)
  66
  67 /*  Given a pointer to a floating point register set in /proc format
  68    (fpregset_t *), unpack the register contents and supply them as gdb's
  69    idea of the current floating point register values. */
  70
  71 void
  72 supply_fpregset (fpregsetp)
  73      fpregset_t *fpregsetp;
  74 {
  75   supply_fpu_registers ((struct fpusave *) &fpregsetp->fp_reg_set);
  76   supply_fpa_registers ((struct fpasave *) &fpregsetp->f_wregs);
  77 }
  78
  79 /*  Given a pointer to a floating point register set in /proc format
  80    (fpregset_t *), update the register specified by REGNO from gdb's idea
  81    of the current floating point register set.  If REGNO is -1, update
  82    them all. */
  83
  84 void
  85 fill_fpregset (fpregsetp, regno)
  86      fpregset_t *fpregsetp;
  87      int regno;
  88 {
  89   int regi;
  90   char *to;
  91   char *from;
  92
  93   /* FIXME: see m68k-tdep.c for an example, for the m68k. */
  94 }
  95
  96 #endif /* defined (FP0_REGNUM) */
  97
  98 /*
  99  * This doesn't quite do the same thing as the procfs.c version, but give
 100  * it the same name so we don't have to put an ifdef in solib.c.
 101  */
 102 /* this could use elf_interpreter() from elfread.c */
 103 int
 104 proc_iterate_over_mappings (func)
 105      int (*func) PARAMS ((int, CORE_ADDR));
 106 {
 107   vaddr_t curseg, memptr;
 108   pt_vseg_t pv;
 109   int rv, cmperr;
 110   sec_ptr interp_sec;
 111   char *interp_content;
 112   int interp_fd, funcstat;
 113   unsigned int size;
 114   char buf1[NBPG], buf2[NBPG];
 115
 116   /*
 117    * The following is really vile.  We can get the name of the
 118    * shared library from the exec_bfd, and we can get a list of
 119    * each virtual memory segment, but there is no simple way to
 120    * find the mapped segment from the shared library (ala
 121    * procfs's PIOCOPENMEM).  As a pretty nasty kludge, we
 122    * compare the virtual memory segment to the contents of the
 123    * .interp file.  If they match, we assume that we've got the
 124    * right one.
 125    */
 126
 127   /*
 128    * TODO: for attach, use XPT_OPENT to get the executable, in
 129    * case we're attached without knowning the executable's
 130    * filename.
 131    */
 132
 133 #ifdef VERBOSE_DEBUG
 134   printf ("proc_iter\n");
 135 #endif
 136   interp_sec = bfd_get_section_by_name (exec_bfd, ".interp");
 137   if (!interp_sec)
 138     {
 139       return 0;
 140     }
 141
 142   size = bfd_section_size (exec_bfd, interp_sec);
 143   interp_content = alloca (size);
 144   if (0 == bfd_get_section_contents (exec_bfd, interp_sec,
 145                                      interp_content, (file_ptr) 0, size))
 146     {
 147       return 0;
 148     }
 149
 150 #ifdef VERBOSE_DEBUG
 151   printf ("proc_iter: \"%s\"\n", interp_content);
 152 #endif
 153   interp_fd = open (interp_content, O_RDONLY, 0);
 154   if (-1 == interp_fd)
 155     {
 156       return 0;
 157     }
 158
 159   curseg = 0;
 160   while (1)
 161     {
 162       rv = ptrace (PT_NEXT_VSEG, inferior_pid, &pv, curseg);
 163 #ifdef VERBOSE_DEBUG
 164       printf ("PT_NEXT_VSEG: rv %d errno %d\n", rv, errno);
 165 #endif
 166       if (-1 == rv)
 167         break;
 168       if (0 == rv)
 169         break;
 170 #ifdef VERBOSE_DEBUG
 171       printf ("pv.pv_start 0x%x pv_size 0x%x pv_prot 0x%x\n",
 172               pv.pv_start, pv.pv_size, pv.pv_prot);
 173 #endif
 174       curseg = pv.pv_start + pv.pv_size;
 175
 176       rv = lseek (interp_fd, 0, SEEK_SET);
 177       if (-1 == rv)
 178         {
 179           perror ("lseek");
 180           close (interp_fd);
 181           return 0;
 182         }
 183       for (memptr = pv.pv_start; memptr < pv.pv_start + pv.pv_size;
 184            memptr += NBPG)
 185         {
 186 #ifdef VERBOSE_DEBUG
 187           printf ("memptr 0x%x\n", memptr);
 188 #endif
 189           rv = read (interp_fd, buf1, NBPG);
 190           if (-1 == rv)
 191             {
 192               perror ("read");
 193               close (interp_fd);
 194               return 0;
 195             }
 196           rv = ptrace (PT_RDATA_PAGE, inferior_pid, buf2,
 197                        memptr);
 198           if (-1 == rv)
 199             {
 200               perror ("ptrace");
 201               close (interp_fd);
 202               return 0;
 203             }
 204           cmperr = memcmp (buf1, buf2, NBPG);
 205           if (cmperr)
 206             break;
 207         }
 208       if (0 == cmperr)
 209         {
 210           /* this is it */
 211           funcstat = (*func) (interp_fd, pv.pv_start);
 212           break;
 213         }
 214     }
 215   close (interp_fd);
 216   return 0;
 217 }