bfd/trad-core.c

   1 /* BFD back end for traditional Unix core files (U-area and sections, raw)
   2    Copyright (C) 1988, 1989, 1991 Free Software Foundation, Inc.  */
   3
   4 /* This file does not define a particular back-end, but it defines routines
   5    that can be used by other back-ends.  */
   6
   7 #include "bfd.h"
   8 #include <stdio.h>
   9 #include "libbfd.h"
  10
  11 #include "liba.out.h"           /* BFD a.out internal data structures */
  12
  13 #include <sys/types.h>
  14 #include <sys/param.h>
  15 #include <sys/dir.h>
  16 #include <signal.h>
  17 #include <machine/reg.h>
  18
  19 #include <sys/user.h>           /* After a.out.h  */
  20 #include <sys/file.h>
  21 #include <sys/stat.h>
  22
  23 #include <errno.h>
  24
  25 /* need this cast b/c ptr is really void * */
  26 #define core_hdr(bfd) (((struct core_data *) (bfd->tdata))->hdr)
  27 #define core_datasec(bfd) (((struct core_data *) ((bfd)->tdata))->data_section)
  28 #define core_stacksec(bfd) (((struct core_data*)((bfd)->tdata))->stack_section)
  29 #define core_regsec(bfd) (((struct core_data *) ((bfd)->tdata))->reg_section)
  30 #define core_upage(bfd) (((struct core_data *) ((bfd)->tdata))->upage)
  31
  32 /* These are stored in the bfd's tdata */
  33 struct core_data {
  34   struct user *upage;             /* core file header */
  35   asection *data_section;
  36   asection *stack_section;
  37   asection *reg_section;
  38 };
  39
  40 bfd_target *
  41 trad_unix_core_file_p (abfd)
  42      bfd *abfd;
  43 {
  44 #if HOST_SYS == SUN_SYS
  45   return 0;
  46 #else
  47   int val;
  48   char *rawptr;
  49   struct user u;
  50   unsigned int reg_offset, fp_reg_offset;
  51
  52   /* 4.2-style (and perhaps also sysV-style) core dump file.  */
  53
  54   val = bfd_read ((void *)&u, 1, sizeof u, abfd);
  55   if (val != sizeof u)
  56     return 0;                   /* Too small to be a core file */
  57
  58   /* Sanity check perhaps??? */
  59   if (u.u_dsize > 0x1000000)    /* Remember, it's in pages... */
  60     return 0;
  61   if (u.u_ssize > 0x1000000)
  62     return 0;
  63   /* Check that the size claimed is no greater than the file size. FIXME. */
  64
  65   /* OK, we believe you.  You're a core file (sure, sure).  */
  66
  67   /* Allocate both the upage and the struct core_data at once, so
  68      a single free() will free them both.  */
  69   rawptr = (char *)zalloc (sizeof (u) + sizeof (struct core_data));
  70   if (rawptr == NULL) {
  71     bfd_error = no_memory;
  72     return 0;
  73   }
  74
  75   set_tdata (abfd, (struct core_data *)rawptr);
  76   core_upage (abfd) = (struct user *)(rawptr + sizeof (struct core_data));
  77   *core_upage (abfd) = u;               /* Save that upage! */
  78
  79   /* create the sections.  This is raunchy, but bfd_close wants to reclaim
  80      them */
  81   core_stacksec (abfd) = (asection *) zalloc (sizeof (asection));
  82   if (core_stacksec (abfd) == NULL) {
  83 loser:
  84     bfd_error = no_memory;
  85     free ((void *)rawptr);
  86     return 0;
  87   }
  88   core_datasec (abfd) = (asection *) zalloc (sizeof (asection));
  89   if (core_datasec (abfd) == NULL) {
  90 loser1:
  91     free ((void *)core_stacksec (abfd));
  92     goto loser;
  93   }
  94   core_regsec (abfd) = (asection *) zalloc (sizeof (asection));
  95   if (core_regsec (abfd) == NULL) {
  96 loser2:
  97     free ((void *)core_datasec (abfd));
  98     goto loser1;
  99   }
 100
 101   core_stacksec (abfd)->name = ".stack";
 102   core_datasec (abfd)->name = ".data";
 103   core_regsec (abfd)->name = ".reg";
 104
 105   core_stacksec (abfd)->flags = SEC_ALLOC + SEC_LOAD;
 106   core_datasec (abfd)->flags = SEC_ALLOC + SEC_LOAD;
 107   core_regsec (abfd)->flags = SEC_ALLOC;
 108
 109   core_datasec (abfd)->size =  NBPG * u.u_dsize;
 110   core_stacksec (abfd)->size = NBPG * u.u_ssize;
 111   core_regsec (abfd)->size = NBPG * UPAGES;  /* Larger than sizeof struct u */
 112
 113   /* What a hack... we'd like to steal it from the exec file,
 114      since the upage does not seem to provide it.  FIXME.  */
 115   core_datasec (abfd)->vma = TEXT_START_ADDR + (NBPG * u.u_tsize);
 116   core_stacksec (abfd)->vma = STACK_END_ADDR - (NBPG * u.u_ssize);
 117   core_regsec (abfd)->vma = -1;
 118
 119   core_datasec (abfd)->filepos = NBPG * UPAGES;
 120   core_stacksec (abfd)->filepos = (NBPG * UPAGES) + NBPG * u.u_dsize;
 121   core_regsec (abfd)->filepos = 0;      /* Register segment is the upage */
 122
 123   /* Align to word at least */
 124   core_stacksec (abfd)->alignment_power = 2;
 125   core_datasec (abfd)->alignment_power = 2;
 126   core_regsec (abfd)->alignment_power = 2;
 127
 128   abfd->sections = core_stacksec (abfd);
 129   core_stacksec (abfd)->next = core_datasec (abfd);
 130   core_datasec (abfd)->next = core_regsec (abfd);
 131   abfd->section_count = 3;
 132
 133   return abfd->xvec;
 134 #endif
 135 }
 136
 137 char *
 138 trad_unix_core_file_failing_command (abfd)
 139      bfd *abfd;
 140 {
 141   if (*core_upage (abfd)->u_comm)
 142     return core_upage (abfd)->u_comm;
 143   else
 144     return 0;
 145 }
 146
 147 int
 148 trad_unix_core_file_failing_signal (abfd)
 149      bfd *abfd;
 150 {
 151   return -1;            /* FIXME, where is it? */
 152 }
 153
 154 boolean
 155 trad_unix_core_file_matches_executable_p  (core_bfd, exec_bfd)
 156      bfd *core_bfd, *exec_bfd;
 157 {
 158   return true;          /* FIXME, We have no way of telling at this point */
 159 }