gdb/ptx4-nat.c

   1 /* Native-dependent code for ptx 4.0
   2    Copyright 1988, 1989, 1991, 1992, 1994, 1999, 2000, 2001
   3    Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 #include "defs.h"
  23 #include "inferior.h"
  24 #include "gdbcore.h"
  25 #include "regcache.h"
  26 #include <sys/procfs.h>
  27 #include <sys/ptrace.h>
  28 #include <sys/param.h>
  29 #include <fcntl.h>
  30
  31 /* Prototypes for supply_gregset etc. */
  32 #include "gregset.h"
  33
  34 /*  Given a pointer to a general register set in /proc format (gregset_t *),
  35    unpack the register contents and supply them as gdb's idea of the current
  36    register values. */
  37
  38 void
  39 supply_gregset (gregset_t *gregsetp)
  40 {
  41   supply_register (EAX_REGNUM, (char *) &(*gregsetp)[EAX]);
  42   supply_register (EDX_REGNUM, (char *) &(*gregsetp)[EDX]);
  43   supply_register (ECX_REGNUM, (char *) &(*gregsetp)[ECX]);
  44   supply_register (EBX_REGNUM, (char *) &(*gregsetp)[EBX]);
  45   supply_register (ESI_REGNUM, (char *) &(*gregsetp)[ESI]);
  46   supply_register (EDI_REGNUM, (char *) &(*gregsetp)[EDI]);
  47   supply_register (ESP_REGNUM, (char *) &(*gregsetp)[UESP]);
  48   supply_register (EBP_REGNUM, (char *) &(*gregsetp)[EBP]);
  49   supply_register (EIP_REGNUM, (char *) &(*gregsetp)[EIP]);
  50   supply_register (EFLAGS_REGNUM, (char *) &(*gregsetp)[EFL]);
  51 }
  52
  53 void
  54 fill_gregset (gregset_t *gregsetp, int regno)
  55 {
  56   int regi;
  57
  58   for (regi = 0; regi < NUM_REGS; regi++)
  59     {
  60       if ((regno == -1) || (regno == regi))
  61         {
  62           (*gregsetp)[regi] = *(greg_t *) & registers[REGISTER_BYTE (regi)];
  63         }
  64     }
  65 }
  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 (fpregset_t *fpregsetp)
  73 {
  74   supply_fpu_registers ((struct fpusave *) &fpregsetp->fp_reg_set);
  75   supply_fpa_registers ((struct fpasave *) &fpregsetp->f_wregs);
  76 }
  77
  78 /*  Given a pointer to a floating point register set in /proc format
  79    (fpregset_t *), update the register specified by REGNO from gdb's idea
  80    of the current floating point register set.  If REGNO is -1, update
  81    them all. */
  82
  83 void
  84 fill_fpregset (fpregset_t *fpregsetp, int regno)
  85 {
  86   int regi;
  87   char *to;
  88   char *from;
  89
  90   /* FIXME: see m68k-tdep.c for an example, for the m68k. */
  91 }
  92
  93 /*
  94  * This doesn't quite do the same thing as the procfs.c version, but give
  95  * it the same name so we don't have to put an ifdef in solib.c.
  96  */
  97 /* this could use elf_interpreter() from elfread.c */
  98 int
  99 proc_iterate_over_mappings (int (*func) (int, CORE_ADDR))
 100 {
 101   vaddr_t curseg, memptr;
 102   pt_vseg_t pv;
 103   int rv, cmperr;
 104   sec_ptr interp_sec;
 105   char *interp_content;
 106   int interp_fd, funcstat;
 107   unsigned int size;
 108   char buf1[NBPG], buf2[NBPG];
 109
 110   /*
 111    * The following is really vile.  We can get the name of the
 112    * shared library from the exec_bfd, and we can get a list of
 113    * each virtual memory segment, but there is no simple way to
 114    * find the mapped segment from the shared library (ala
 115    * procfs's PIOCOPENMEM).  As a pretty nasty kludge, we
 116    * compare the virtual memory segment to the contents of the
 117    * .interp file.  If they match, we assume that we've got the
 118    * right one.
 119    */
 120
 121   /*
 122    * TODO: for attach, use XPT_OPENT to get the executable, in
 123    * case we're attached without knowning the executable's
 124    * filename.
 125    */
 126
 127 #ifdef VERBOSE_DEBUG
 128   printf ("proc_iter\n");
 129 #endif
 130   interp_sec = bfd_get_section_by_name (exec_bfd, ".interp");
 131   if (!interp_sec)
 132     {
 133       return 0;
 134     }
 135
 136   size = bfd_section_size (exec_bfd, interp_sec);
 137   interp_content = alloca (size);
 138   if (0 == bfd_get_section_contents (exec_bfd, interp_sec,
 139                                      interp_content, (file_ptr) 0, size))
 140     {
 141       return 0;
 142     }
 143
 144 #ifdef VERBOSE_DEBUG
 145   printf ("proc_iter: \"%s\"\n", interp_content);
 146 #endif
 147   interp_fd = open (interp_content, O_RDONLY, 0);
 148   if (-1 == interp_fd)
 149     {
 150       return 0;
 151     }
 152
 153   curseg = 0;
 154   while (1)
 155     {
 156       rv = ptrace (PT_NEXT_VSEG, PIDGET (inferior_ptid), &pv, curseg);
 157 #ifdef VERBOSE_DEBUG
 158       printf ("PT_NEXT_VSEG: rv %d errno %d\n", rv, errno);
 159 #endif
 160       if (-1 == rv)
 161         break;
 162       if (0 == rv)
 163         break;
 164 #ifdef VERBOSE_DEBUG
 165       printf ("pv.pv_start 0x%x pv_size 0x%x pv_prot 0x%x\n",
 166               pv.pv_start, pv.pv_size, pv.pv_prot);
 167 #endif
 168       curseg = pv.pv_start + pv.pv_size;
 169
 170       rv = lseek (interp_fd, 0, SEEK_SET);
 171       if (-1 == rv)
 172         {
 173           perror ("lseek");
 174           close (interp_fd);
 175           return 0;
 176         }
 177       for (memptr = pv.pv_start; memptr < pv.pv_start + pv.pv_size;
 178            memptr += NBPG)
 179         {
 180 #ifdef VERBOSE_DEBUG
 181           printf ("memptr 0x%x\n", memptr);
 182 #endif
 183           rv = read (interp_fd, buf1, NBPG);
 184           if (-1 == rv)
 185             {
 186               perror ("read");
 187               close (interp_fd);
 188               return 0;
 189             }
 190           rv = ptrace (PT_RDATA_PAGE, PIDGET (inferior_ptid), buf2,
 191                        memptr);
 192           if (-1 == rv)
 193             {
 194               perror ("ptrace");
 195               close (interp_fd);
 196               return 0;
 197             }
 198           cmperr = memcmp (buf1, buf2, NBPG);
 199           if (cmperr)
 200             break;
 201         }
 202       if (0 == cmperr)
 203         {
 204           /* this is it */
 205           funcstat = (*func) (interp_fd, pv.pv_start);
 206           break;
 207         }
 208     }
 209   close (interp_fd);
 210   return 0;
 211 }