1 files changed, 500 insertions, 0 deletions

diff --git a/gdb/rs6000-nat.c b/gdb/rs6000-nat.c
index 4ffc48c..db8c580 100644
--- a/gdb/rs6000-nat.c
+++ b/gdb/rs6000-nat.c
@@ -20,6 +20,12 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
 #include "defs.h"
 #include "inferior.h"
 #include "target.h"
+#include "gdbcore.h"
+#include "xcoffsolib.h"
+#include "symfile.h"
+#include "objfiles.h"
+#include "libbfd.h"		/* BFD internals (sigh!)  FIXME */
+#include "bfd.h"
 
 #include <sys/ptrace.h>
 #include <sys/reg.h>
@@ -35,12 +41,19 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
 #include <sys/file.h>
 #include <sys/stat.h>
 #include <sys/core.h>
+#include <sys/ldr.h>
 
 extern int errno;
+extern struct vmap * map_vmap PARAMS ((bfd *bf, bfd *arch));
+
+extern struct target_ops exec_ops;
 
 static void
 exec_one_dummy_insn PARAMS ((void));
 
+extern void
+add_text_to_loadinfo PARAMS ((CORE_ADDR textaddr, CORE_ADDR dataaddr));
+
 /* Conversion from gdb-to-system special purpose register numbers.. */
 
 static int special_regs[] = {
@@ -246,3 +259,490 @@ fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
   else
     fprintf_unfiltered (gdb_stderr, "Gdb error: unknown parameter to fetch_core_registers().\n");
 }
+
+/*  vmap_symtab -	handle symbol translation on vmapping */
+
+static void
+vmap_symtab (vp)
+     register struct vmap *vp;
+{
+  register struct objfile *objfile;
+  asection *textsec;
+  asection *datasec;
+  asection *bsssec;
+  CORE_ADDR text_delta;
+  CORE_ADDR data_delta;
+  CORE_ADDR bss_delta;
+  struct section_offsets *new_offsets;
+  int i;
+  
+  objfile = vp->objfile;
+  if (objfile == NULL)
+    {
+      /* OK, it's not an objfile we opened ourselves.
+	 Currently, that can only happen with the exec file, so
+	 relocate the symbols for the symfile.  */
+      if (symfile_objfile == NULL)
+	return;
+      objfile = symfile_objfile;
+    }
+
+  new_offsets = alloca
+    (sizeof (struct section_offsets)
+     + sizeof (new_offsets->offsets) * objfile->num_sections);
+
+  for (i = 0; i < objfile->num_sections; ++i)
+    ANOFFSET (new_offsets, i) = ANOFFSET (objfile->section_offsets, i);
+  
+  textsec = bfd_get_section_by_name (vp->bfd, ".text");
+  text_delta =
+    vp->tstart - ANOFFSET (objfile->section_offsets, textsec->target_index);
+  ANOFFSET (new_offsets, textsec->target_index) = vp->tstart;
+
+  datasec = bfd_get_section_by_name (vp->bfd, ".data");
+  data_delta =
+    vp->dstart - ANOFFSET (objfile->section_offsets, datasec->target_index);
+  ANOFFSET (new_offsets, datasec->target_index) = vp->dstart;
+  
+  bsssec = bfd_get_section_by_name (vp->bfd, ".bss");
+  bss_delta =
+    vp->dstart - ANOFFSET (objfile->section_offsets, bsssec->target_index);
+  ANOFFSET (new_offsets, bsssec->target_index) = vp->dstart;
+
+  objfile_relocate (objfile, new_offsets);
+
+  {
+    struct obj_section *s;
+    for (s = objfile->sections; s < objfile->sections_end; ++s)
+      {
+	if (s->sec_ptr->target_index == textsec->target_index)
+	  {
+	    s->addr += text_delta;
+	    s->endaddr += text_delta;
+	  }
+	else if (s->sec_ptr->target_index == datasec->target_index)
+	  {
+	    s->addr += data_delta;
+	    s->endaddr += data_delta;
+	  }
+	else if (s->sec_ptr->target_index == bsssec->target_index)
+	  {
+	    s->addr += bss_delta;
+	    s->endaddr += bss_delta;
+	  }
+      }
+  }
+  
+  if (text_delta != 0)
+    /* breakpoints need to be relocated as well. */
+    fixup_breakpoints (0, TEXT_SEGMENT_BASE, text_delta);
+}
+
+/* Add symbols for an objfile.  */
+static int
+objfile_symbol_add (arg)
+     char *arg;
+{
+  struct objfile *obj = (struct objfile *) arg;
+  syms_from_objfile (obj, 0, 0, 0);
+  new_symfile_objfile (obj, 0, 0);
+  return 1;
+}
+
+/* Add a new vmap entry based on ldinfo() information.
+
+   If ldi->ldinfo_fd is not valid (e.g. this struct ld_info is from a
+   core file), the caller should set it to -1, and we will open the file.
+
+   Return the vmap new entry.  */
+static struct vmap *
+add_vmap(ldi)
+     register struct ld_info *ldi; 
+{
+	bfd *abfd, *last;
+	register char *mem, *objname;
+	struct objfile *obj;
+	struct vmap *vp;
+
+	/* This ldi structure was allocated using alloca() in 
+	   xcoff_relocate_symtab(). Now we need to have persistent object 
+	   and member names, so we should save them. */
+
+	mem = ldi->ldinfo_filename + strlen(ldi->ldinfo_filename) + 1;
+	mem = savestring (mem, strlen (mem));
+	objname = savestring (ldi->ldinfo_filename, strlen (ldi->ldinfo_filename));
+
+	if (ldi->ldinfo_fd < 0)
+	  /* Note that this opens it once for every member; a possible
+	     enhancement would be to only open it once for every object.  */
+	  abfd = bfd_openr (objname, gnutarget);
+	else
+	  abfd = bfd_fdopenr(objname, gnutarget, ldi->ldinfo_fd);
+	if (!abfd)
+	  error("Could not open `%s' as an executable file: %s",
+					objname, bfd_errmsg(bfd_error));
+
+
+	/* make sure we have an object file */
+
+	if (bfd_check_format(abfd, bfd_object))
+	  vp = map_vmap (abfd, 0);
+
+	else if (bfd_check_format(abfd, bfd_archive)) {
+		last = 0;
+		/*
+		 * FIXME??? am I tossing BFDs?  bfd?
+		 */
+		while (last = bfd_openr_next_archived_file(abfd, last))
+			if (STREQ(mem, last->filename))
+				break;
+
+		if (!last) {
+		  bfd_close(abfd);
+		  /* FIXME -- should be error */
+		  warning("\"%s\": member \"%s\" missing.", abfd->filename, mem);
+		  return;
+		}
+
+		if (!bfd_check_format(last, bfd_object)) {
+			bfd_close(last);	/* XXX???	*/
+			goto obj_err;
+		}
+
+		vp = map_vmap (last, abfd);
+	}
+	else {
+	    obj_err:
+		bfd_close(abfd);
+		error ("\"%s\": not in executable format: %s.",
+		       objname, bfd_errmsg(bfd_error));
+		/*NOTREACHED*/
+	}
+	obj = allocate_objfile (vp->bfd, 0);
+	vp->objfile = obj;
+
+#ifndef SOLIB_SYMBOLS_MANUAL
+	if (catch_errors (objfile_symbol_add, (char *)obj,
+			  "Error while reading shared library symbols:\n",
+			  RETURN_MASK_ALL))
+	  {
+	    /* Note this is only done if symbol reading was successful.  */
+	    vmap_symtab (vp);
+	    vp->loaded = 1;
+	  }
+#endif
+	return vp;
+}
+
+/*
+ * vmap_ldinfo -	update VMAP info with ldinfo() information
+ *
+ * Input:
+ *	ldi	-	^ to ldinfo() results.
+ */
+
+static void
+vmap_ldinfo(ldi)
+     register struct ld_info *ldi;
+{
+  struct stat ii, vi;
+  register struct vmap *vp;
+  register got_one, retried;
+  CORE_ADDR ostart;
+
+  /*
+   * for each *ldi, see if we have a corresponding *vp
+   *	if so, update the mapping, and symbol table.
+   *	if not, add an entry and symbol table.
+   */
+  do {
+	char *name = ldi->ldinfo_filename;
+	char *memb = name + strlen(name) + 1;
+
+	retried = 0;
+
+	if (fstat(ldi->ldinfo_fd, &ii) < 0)
+		fatal("cannot fstat(%d) on %s"
+		      , ldi->ldinfo_fd
+		      , name);
+retry:
+	for (got_one = 0, vp = vmap; vp; vp = vp->nxt) {
+	  FILE *io;
+
+	  /* First try to find a `vp', which is the same as in ldinfo.
+	     If not the same, just continue and grep the next `vp'. If same,
+	     relocate its tstart, tend, dstart, dend values. If no such `vp'
+	     found, get out of this for loop, add this ldi entry as a new vmap
+	     (add_vmap) and come back, fins its `vp' and so on... */
+
+	  /* The filenames are not always sufficient to match on. */
+
+	  if ((name[0] == '/' && !STREQ(name, vp->name))
+	      	|| (memb[0] && !STREQ(memb, vp->member)))
+	    continue;
+
+	  io = bfd_cache_lookup(vp->bfd);		/* totally opaque! */
+	  if (!io)
+	    fatal("cannot find BFD's iostream for %s", vp->name);
+
+	  /* see if we are referring to the same file */
+
+	  if (fstat(fileno(io), &vi) < 0)
+	    fatal("cannot fstat BFD for %s", vp->name);
+
+	  if (ii.st_dev != vi.st_dev || ii.st_ino != vi.st_ino)
+	    continue;
+
+	  if (!retried)
+	    close(ldi->ldinfo_fd);
+
+	  ++got_one;
+
+	  /* found a corresponding VMAP. remap! */
+	  ostart = vp->tstart;
+
+	  /* We can assume pointer == CORE_ADDR, this code is native only.  */
+	  vp->tstart = (CORE_ADDR) ldi->ldinfo_textorg;
+	  vp->tend   = vp->tstart + ldi->ldinfo_textsize;
+	  vp->dstart = (CORE_ADDR) ldi->ldinfo_dataorg;
+	  vp->dend   = vp->dstart + ldi->ldinfo_datasize;
+
+	  if (vp->tadj) {
+	    vp->tstart += vp->tadj;
+	    vp->tend   += vp->tadj;
+	  }
+
+	  /* relocate symbol table(s). */
+	  vmap_symtab (vp);
+
+	  /* there may be more, so we don't break out of the loop. */
+	}
+
+	/* if there was no matching *vp, we must perforce create the sucker(s) */
+  	if (!got_one && !retried) {
+	  add_vmap(ldi);
+	  ++retried;
+	  goto retry;
+	}
+  } while (ldi->ldinfo_next
+	   && (ldi = (void *) (ldi->ldinfo_next + (char *) ldi)));
+
+}
+
+/* As well as symbol tables, exec_sections need relocation. After
+   the inferior process' termination, there will be a relocated symbol
+   table exist with no corresponding inferior process. At that time, we
+   need to use `exec' bfd, rather than the inferior process's memory space
+   to look up symbols.
+
+   `exec_sections' need to be relocated only once, as long as the exec
+   file remains unchanged.
+*/
+
+static void
+vmap_exec ()
+{
+  static bfd *execbfd;
+  int i;
+
+  if (execbfd == exec_bfd)
+    return;
+
+  execbfd = exec_bfd;
+
+  if (!vmap || !exec_ops.to_sections)
+    error ("vmap_exec: vmap or exec_ops.to_sections == 0\n");
+
+  for (i=0; &exec_ops.to_sections[i] < exec_ops.to_sections_end; i++)
+    {
+      if (STREQ(".text", exec_ops.to_sections[i].sec_ptr->name))
+	{
+	  exec_ops.to_sections[i].addr += vmap->tstart;
+	  exec_ops.to_sections[i].endaddr += vmap->tstart;
+	}
+      else if (STREQ(".data", exec_ops.to_sections[i].sec_ptr->name))
+	{
+	  exec_ops.to_sections[i].addr += vmap->dstart;
+	  exec_ops.to_sections[i].endaddr += vmap->dstart;
+	}
+    }
+}
+
+/* xcoff_relocate_symtab -	hook for symbol table relocation.
+   also reads shared libraries.. */
+
+xcoff_relocate_symtab (pid)
+unsigned int pid;
+{
+#define	MAX_LOAD_SEGS 64		/* maximum number of load segments */
+
+    struct ld_info *ldi;
+    int temp;
+
+    ldi = (void *) alloca(MAX_LOAD_SEGS * sizeof (*ldi));
+
+    /* According to my humble theory, AIX has some timing problems and
+       when the user stack grows, kernel doesn't update stack info in time
+       and ptrace calls step on user stack. That is why we sleep here a little,
+       and give kernel to update its internals. */
+
+    usleep (36000);
+
+    errno = 0;
+    ptrace(PT_LDINFO, pid, (PTRACE_ARG3_TYPE) ldi,
+	   MAX_LOAD_SEGS * sizeof(*ldi), ldi);
+    if (errno) {
+      perror_with_name ("ptrace ldinfo");
+      return 0;
+    }
+
+    vmap_ldinfo(ldi);
+
+   do {
+     /* We are allowed to assume CORE_ADDR == pointer.  This code is
+	native only.  */
+     add_text_to_loadinfo ((CORE_ADDR) ldi->ldinfo_textorg,
+			   (CORE_ADDR) ldi->ldinfo_dataorg);
+    } while (ldi->ldinfo_next
+	     && (ldi = (void *) (ldi->ldinfo_next + (char *) ldi)));
+
+#if 0
+  /* Now that we've jumbled things around, re-sort them.  */
+  sort_minimal_symbols ();
+#endif
+
+  /* relocate the exec and core sections as well. */
+  vmap_exec ();
+}
+
+/* Core file stuff.  */
+
+/* Relocate symtabs and read in shared library info, based on symbols
+   from the core file.  */
+void
+xcoff_relocate_core ()
+{
+/* Offset of member MEMBER in a struct of type TYPE.  */
+#ifndef offsetof
+#define offsetof(TYPE, MEMBER) ((int) &((TYPE *)0)->MEMBER)
+#endif
+
+/* Size of a struct ld_info except for the variable-length filename.  */
+#define LDINFO_SIZE (offsetof (struct ld_info, ldinfo_filename))
+
+  sec_ptr ldinfo_sec;
+  int offset = 0;
+  struct ld_info *ldip;
+  struct vmap *vp;
+
+  /* Allocated size of buffer.  */
+  int buffer_size = LDINFO_SIZE;
+  char *buffer = xmalloc (buffer_size);
+  struct cleanup *old = make_cleanup (free_current_contents, &buffer);
+    
+  /* FIXME, this restriction should not exist.  For now, though I'll
+     avoid coredumps with error() pending a real fix.  */
+  if (vmap == NULL)
+    error
+      ("Can't debug a core file without an executable file (on the RS/6000)");
+  
+  ldinfo_sec = bfd_get_section_by_name (core_bfd, ".ldinfo");
+  if (ldinfo_sec == NULL)
+    {
+bfd_err:
+      fprintf_filtered (gdb_stderr, "Couldn't get ldinfo from core file: %s\n",
+			bfd_errmsg (bfd_error));
+      do_cleanups (old);
+      return;
+    }
+  do
+    {
+      int i;
+      int names_found = 0;
+
+      /* Read in everything but the name.  */
+      if (bfd_get_section_contents (core_bfd, ldinfo_sec, buffer,
+				    offset, LDINFO_SIZE) == 0)
+	goto bfd_err;
+
+      /* Now the name.  */
+      i = LDINFO_SIZE;
+      do
+	{
+	  if (i == buffer_size)
+	    {
+	      buffer_size *= 2;
+	      buffer = xrealloc (buffer, buffer_size);
+	    }
+	  if (bfd_get_section_contents (core_bfd, ldinfo_sec, &buffer[i],
+					offset + i, 1) == 0)
+	    goto bfd_err;
+	  if (buffer[i++] == '\0')
+	    ++names_found;
+	} while (names_found < 2);
+
+      ldip = (struct ld_info *)buffer;
+
+      /* Can't use a file descriptor from the core file; need to open it.  */
+      ldip->ldinfo_fd = -1;
+      
+      /* The first ldinfo is for the exec file, allocated elsewhere.  */
+      if (offset == 0)
+	vp = vmap;
+      else
+	vp = add_vmap (ldip);
+
+      offset += ldip->ldinfo_next;
+
+      /* We can assume pointer == CORE_ADDR, this code is native only.  */
+      vp->tstart = (CORE_ADDR) ldip->ldinfo_textorg;
+      vp->tend = vp->tstart + ldip->ldinfo_textsize;
+      vp->dstart = (CORE_ADDR) ldip->ldinfo_dataorg;
+      vp->dend = vp->dstart + ldip->ldinfo_datasize;
+
+      if (vp->tadj != 0) {
+	vp->tstart += vp->tadj;
+	vp->tend += vp->tadj;
+      }
+
+      /* Unless this is the exec file,
+	 add our sections to the section table for the core target.  */
+      if (vp != vmap)
+	{
+	  int count;
+	  struct section_table *stp;
+	  
+	  count = core_ops.to_sections_end - core_ops.to_sections;
+	  count += 2;
+	  core_ops.to_sections = (struct section_table *)
+	    xrealloc (core_ops.to_sections,
+		      sizeof (struct section_table) * count);
+	  core_ops.to_sections_end = core_ops.to_sections + count;
+	  stp = core_ops.to_sections_end - 2;
+
+	  /* "Why do we add bfd_section_vma?", I hear you cry.
+	     Well, the start of the section in the file is actually
+	     that far into the section as the struct vmap understands it.
+	     So for text sections, bfd_section_vma tends to be 0x200,
+	     and if vp->tstart is 0xd0002000, then the first byte of
+	     the text section on disk corresponds to address 0xd0002200.  */
+	  stp->bfd = vp->bfd;
+	  stp->sec_ptr = bfd_get_section_by_name (stp->bfd, ".text");
+	  stp->addr = bfd_section_vma (stp->bfd, stp->sec_ptr) + vp->tstart;
+	  stp->endaddr = bfd_section_vma (stp->bfd, stp->sec_ptr) + vp->tend;
+	  stp++;
+	  
+	  stp->bfd = vp->bfd;
+	  stp->sec_ptr = bfd_get_section_by_name (stp->bfd, ".data");
+	  stp->addr = bfd_section_vma (stp->bfd, stp->sec_ptr) + vp->dstart;
+	  stp->endaddr = bfd_section_vma (stp->bfd, stp->sec_ptr) + vp->dend;
+	}
+
+      vmap_symtab (vp);
+
+      add_text_to_loadinfo ((CORE_ADDR)ldip->ldinfo_textorg,
+			    (CORE_ADDR)ldip->ldinfo_dataorg);
+    } while (ldip->ldinfo_next != 0);
+  vmap_exec ();
+  do_cleanups (old);
+}