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 (func)
  98      int (*func) (int, CORE_ADDR);
  99 {
 100   vaddr_t curseg, memptr;
 101   pt_vseg_t pv;
 102   int rv, cmperr;
 103   sec_ptr interp_sec;
 104   char *interp_content;
 105   int interp_fd, funcstat;
 106   unsigned int size;
 107   char buf1[NBPG], buf2[NBPG];
 108
 109   /*
 110    * The following is really vile.  We can get the name of the
 111    * shared library from the exec_bfd, and we can get a list of
 112    * each virtual memory segment, but there is no simple way to
 113    * find the mapped segment from the shared library (ala
 114    * procfs's PIOCOPENMEM).  As a pretty nasty kludge, we
 115    * compare the virtual memory segment to the contents of the
 116    * .interp file.  If they match, we assume that we've got the
 117    * right one.
 118    */
 119
 120   /*
 121    * TODO: for attach, use XPT_OPENT to get the executable, in
 122    * case we're attached without knowning the executable's
 123    * filename.
 124    */
 125
 126 #ifdef VERBOSE_DEBUG
 127   printf ("proc_iter\n");
 128 #endif
 129   interp_sec = bfd_get_section_by_name (exec_bfd, ".interp");
 130   if (!interp_sec)
 131     {
 132       return 0;
 133     }
 134
 135   size = bfd_section_size (exec_bfd, interp_sec);
 136   interp_content = alloca (size);
 137   if (0 == bfd_get_section_contents (exec_bfd, interp_sec,
 138                                      interp_content, (file_ptr) 0, size))
 139     {
 140       return 0;
 141     }
 142
 143 #ifdef VERBOSE_DEBUG
 144   printf ("proc_iter: \"%s\"\n", interp_content);
 145 #endif
 146   interp_fd = open (interp_content, O_RDONLY, 0);
 147   if (-1 == interp_fd)
 148     {
 149       return 0;
 150     }
 151
 152   curseg = 0;
 153   while (1)
 154     {
 155       rv = ptrace (PT_NEXT_VSEG, inferior_pid, &pv, curseg);
 156 #ifdef VERBOSE_DEBUG
 157       printf ("PT_NEXT_VSEG: rv %d errno %d\n", rv, errno);
 158 #endif
 159       if (-1 == rv)
 160         break;
 161       if (0 == rv)
 162         break;
 163 #ifdef VERBOSE_DEBUG
 164       printf ("pv.pv_start 0x%x pv_size 0x%x pv_prot 0x%x\n",
 165               pv.pv_start, pv.pv_size, pv.pv_prot);
 166 #endif
 167       curseg = pv.pv_start + pv.pv_size;
 168
 169       rv = lseek (interp_fd, 0, SEEK_SET);
 170       if (-1 == rv)
 171         {
 172           perror ("lseek");
 173           close (interp_fd);
 174           return 0;
 175         }
 176       for (memptr = pv.pv_start; memptr < pv.pv_start + pv.pv_size;
 177            memptr += NBPG)
 178         {
 179 #ifdef VERBOSE_DEBUG
 180           printf ("memptr 0x%x\n", memptr);
 181 #endif
 182           rv = read (interp_fd, buf1, NBPG);
 183           if (-1 == rv)
 184             {
 185               perror ("read");
 186               close (interp_fd);
 187               return 0;
 188             }
 189           rv = ptrace (PT_RDATA_PAGE, inferior_pid, buf2,
 190                        memptr);
 191           if (-1 == rv)
 192             {
 193               perror ("ptrace");
 194               close (interp_fd);
 195               return 0;
 196             }
 197           cmperr = memcmp (buf1, buf2, NBPG);
 198           if (cmperr)
 199             break;
 200         }
 201       if (0 == cmperr)
 202         {
 203           /* this is it */
 204           funcstat = (*func) (interp_fd, pv.pv_start);
 205           break;
 206         }
 207     }
 208   close (interp_fd);
 209   return 0;
 210 }