Implemented IMGLUE reloc + dumping

1 files changed, 321 insertions, 96 deletions

diff --git a/bfd/coff-ppc.c b/bfd/coff-ppc.c
index ae87505..444f211 100644
--- a/bfd/coff-ppc.c
+++ b/bfd/coff-ppc.c
@@ -26,6 +26,9 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
 /* Current State:
    - objdump works
    - relocs generated by gas
+   - ld will link files, but they do not run.
+   - dlltool will not produce correct output in some .reloc cases, and will 
+     not produce the right glue code for dll function calls.
 */
 
 
@@ -47,6 +50,126 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
 
 #include "libcoff.h"
 
+/* In order not to add an int to every hash table item for every coff
+   linker, we define our own hash table, derived from the coff one */
+
+/* PE linker hash table entries. */
+
+struct ppc_coff_link_hash_entry
+{
+  struct coff_link_hash_entry root; /* First entry, as required  */
+
+  /* As we wonder around the relocs, we'll keep the assigned toc_offset
+     here */
+  bfd_vma toc_offset;               /* Our addition, as required */
+  int symbol_is_glue;
+  unsigned long int glue_insn;
+  char eye_catcher[8];
+};
+
+/* Need a 7 char string for an eye catcher */
+#define EYE "krkjunk"
+
+#define CHECK_EYE(addr) \
+ if (strcmp(addr, EYE) != 0) \
+  { \
+    fprintf(stderr,\
+    "File %s, line %d, Hash check failure, bad eye %8s\n", \
+    __FILE__, __LINE__, addr); \
+    abort(); \
+ }
+
+/* PE linker hash table.  */
+
+struct ppc_coff_link_hash_table
+{
+  struct coff_link_hash_table root; /* First entry, as required */
+};
+
+static struct bfd_hash_entry *ppc_coff_link_hash_newfunc
+  PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *,
+	   const char *));
+
+/* Routine to create an entry in the link hash table.  */
+
+static struct bfd_hash_entry *
+ppc_coff_link_hash_newfunc (entry, table, string)
+     struct bfd_hash_entry *entry;
+     struct bfd_hash_table *table;
+     const char *string;
+{
+  struct ppc_coff_link_hash_entry *ret = 
+    (struct ppc_coff_link_hash_entry *) entry;
+
+  /* Allocate the structure if it has not already been allocated by a
+     subclass.  */
+  if (ret == (struct ppc_coff_link_hash_entry *) NULL)
+    ret = (struct ppc_coff_link_hash_entry *)
+      bfd_hash_allocate (table, 
+			 sizeof (struct ppc_coff_link_hash_entry));
+
+  if (ret == (struct ppc_coff_link_hash_entry *) NULL)
+    return NULL;
+
+  /* Call the allocation method of the superclass.  */
+  ret = ((struct ppc_coff_link_hash_entry *)
+	 _bfd_coff_link_hash_newfunc ((struct bfd_hash_entry *) ret, 
+				      table, string));
+
+  if (ret)
+    {
+      /* Initialize the local fields.  */
+      ret->toc_offset = 1;
+      ret->symbol_is_glue = 0;
+      ret->glue_insn = 0;
+      strcpy(ret->eye_catcher, EYE);
+    }
+
+  return (struct bfd_hash_entry *) ret;
+}
+
+/* Initialize a PE linker hash table.  */
+
+static boolean
+ppc_coff_link_hash_table_init (table, abfd, newfunc)
+     struct ppc_coff_link_hash_table *table;
+     bfd *abfd;
+     struct bfd_hash_entry *(*newfunc) PARAMS ((struct bfd_hash_entry *,
+						struct bfd_hash_table *,
+						const char *));
+{
+  return _bfd_coff_link_hash_table_init (&table->root, abfd, newfunc);
+}
+
+/* Create a PE linker hash table.  */
+
+static struct bfd_link_hash_table *
+ppc_coff_link_hash_table_create (abfd)
+     bfd *abfd;
+{
+  struct ppc_coff_link_hash_table *ret;
+
+  ret = ((struct ppc_coff_link_hash_table *)
+	 bfd_alloc (abfd, sizeof (struct ppc_coff_link_hash_table)));
+  if (ret == NULL)
+    {
+      bfd_set_error (bfd_error_no_memory);
+      return NULL;
+    }
+  if (! ppc_coff_link_hash_table_init (ret, abfd,
+					ppc_coff_link_hash_newfunc))
+    {
+      bfd_release (abfd, ret);
+      return (struct bfd_link_hash_table *) NULL;
+    }
+  return &ret->root.root;
+}
+
+/* Now, tailor coffcode.h to use our hash stuff */
+
+#define coff_bfd_link_hash_table_create ppc_coff_link_hash_table_create
+
+
 /* The nt loader points the toc register to &toc + 32768, in order to */
 /* use the complete range of a 16-bit displacement (I guess). We have */
 /* to adjust for this when we fix up loads displaced off the toc reg. */
@@ -581,6 +704,7 @@ static reloc_howto_type ppc_coff_howto_table[] =
 
 /* Some really cheezy macros that can be turned on to test stderr :-) */
 
+#define DEBUG_RELOC
 
 #ifdef DEBUG_RELOC
 #define UN_IMPL(x)                                           \
@@ -638,6 +762,43 @@ enum toc_type
   toc_64
 };
 
+struct list_ele
+{
+  struct list_ele *next;
+  bfd_vma addr;
+  int offset;
+  const char *name;
+};
+
+extern struct list_ele *head;
+extern struct list_ele *tail;
+
+static void
+record_toc(toc_section, our_toc_offset, name)
+     asection *toc_section;
+     int our_toc_offset;
+     const char *name;
+{
+  /* add this entry to our toc addr-offset-name list */
+  struct list_ele *t;
+  t = malloc(sizeof(struct list_ele));
+  t->next = 0;
+  t->offset = our_toc_offset;
+  t->name = name;
+  t->addr = toc_section->output_offset + our_toc_offset;
+
+  if (head == 0)
+    {
+      head = t;
+      tail = t;
+    }
+  else
+    {
+      tail->next = t;
+      tail = t;
+    }
+}
+
 /* record a toc offset against a symbol */
 static int
 ppc_record_toc_entry(abfd, info, sec, sym, toc_kind)
@@ -653,7 +814,7 @@ ppc_record_toc_entry(abfd, info, sec, sym, toc_kind)
   int element_size;
   int data;
   int offset;
-  struct coff_link_hash_entry *h;
+  struct ppc_coff_link_hash_entry *h;
   struct coff_symbol_struct *target;
   int ret_val;
   const char *name;
@@ -662,7 +823,11 @@ ppc_record_toc_entry(abfd, info, sec, sym, toc_kind)
 
   h = 0;
 
-  h = obj_coff_sym_hashes (abfd)[sym];
+  h = (struct ppc_coff_link_hash_entry *) (obj_coff_sym_hashes (abfd)[sym]);
+  if (h != 0)
+    {
+      CHECK_EYE(h->eye_catcher);
+    }
 
   if (h == 0) 
     { 
@@ -707,7 +872,7 @@ ppc_record_toc_entry(abfd, info, sec, sym, toc_kind)
     }
   else
     {
-      name = h->root.root.string;
+      name = h->root.root.root.string;
 
       /* check to see if there's a toc slot allocated. If not, do it
 	 here. It will be used in relocate_section */
@@ -736,6 +901,25 @@ ppc_record_toc_entry(abfd, info, sec, sym, toc_kind)
   return ret_val;
 }
 
+/* record a toc offset against a symbol */
+static void
+ppc_mark_symbol_as_glue(abfd, sym, rel)
+     bfd *abfd;
+     int sym;
+     struct internal_reloc *rel;
+{
+  struct ppc_coff_link_hash_entry *h;
+
+  h = (struct ppc_coff_link_hash_entry *) (obj_coff_sym_hashes (abfd)[sym]);
+
+  CHECK_EYE(h->eye_catcher);
+
+  h->symbol_is_glue = 1;
+  h->glue_insn = bfd_get_32 (abfd, (bfd_byte *) &rel->r_vaddr);
+
+  return;
+}
+
 
 /* Provided the symbol, returns the value reffed */
 static long get_symbol_value PARAMS ((asymbol *));
@@ -882,7 +1066,7 @@ coff_ppc_relocate_section (output_bfd, info, input_bfd, input_section,
   for (; rel < relend; rel++)
     {
       long symndx;
-      struct coff_link_hash_entry *h;
+      struct ppc_coff_link_hash_entry *h;
       struct internal_syment *sym;
       bfd_vma val;
 
@@ -895,20 +1079,20 @@ coff_ppc_relocate_section (output_bfd, info, input_bfd, input_section,
       unsigned short junk    = EXTRACT_JUNK (rel->r_type);
   
 #ifdef DEBUG_RELOC
-  /* now examine flags */
-  if (r_flags != 0) 
-    {
-      fprintf (stderr, "Reloc with flags found!");
-      if ( r_flags & IMAGE_REL_PPC_NEG ) 
-	fprintf (stderr, " NEG");
-      if ( r_flags & IMAGE_REL_PPC_BRTAKEN )
-	fprintf (stderr, " BRTAKEN");
-      if ( r_flags & IMAGE_REL_PPC_BRNTAKEN )
-	fprintf (stderr, " BRNTAKEN");
-      if ( r_flags & IMAGE_REL_PPC_TOCDEFN )
-	fprintf (stderr, " TOCDEFN");
-      fprintf(stderr, "\n");
-    }
+      /* now examine flags */
+      if (r_flags != 0) 
+	{
+	  fprintf (stderr, "Reloc with flags found!");
+	  if ( r_flags & IMAGE_REL_PPC_NEG ) 
+	    fprintf (stderr, " NEG");
+	  if ( r_flags & IMAGE_REL_PPC_BRTAKEN )
+	    fprintf (stderr, " BRTAKEN");
+	  if ( r_flags & IMAGE_REL_PPC_BRNTAKEN )
+	    fprintf (stderr, " BRNTAKEN");
+	  if ( r_flags & IMAGE_REL_PPC_TOCDEFN )
+	    fprintf (stderr, " TOCDEFN");
+	  fprintf(stderr, "\n");
+	}
 #endif
 
       symndx = rel->r_symndx;
@@ -924,7 +1108,13 @@ coff_ppc_relocate_section (output_bfd, info, input_bfd, input_section,
 	}
       else
 	{
-	  h = obj_coff_sym_hashes (input_bfd)[symndx];
+	  h = (struct ppc_coff_link_hash_entry *) 
+	    (obj_coff_sym_hashes (input_bfd)[symndx]);
+	  if (h != 0) 
+	    {
+	      CHECK_EYE(h->eye_catcher);
+	    }
+
 	  sym = syms + symndx;
 	}
 
@@ -947,18 +1137,20 @@ coff_ppc_relocate_section (output_bfd, info, input_bfd, input_section,
 	}
       else
 	{
-	  if (h->root.type == bfd_link_hash_defined
-	      || h->root.type == bfd_link_hash_defweak)
+	  CHECK_EYE(h->eye_catcher);
+
+	  if (h->root.root.type == bfd_link_hash_defined
+	      || h->root.root.type == bfd_link_hash_defweak)
 	    {
-	      sec = h->root.u.def.section;
-	      val = (h->root.u.def.value
+	      sec = h->root.root.u.def.section;
+	      val = (h->root.root.u.def.value
 		     + sec->output_section->vma
 		     + sec->output_offset);
 	    }
 	  else
 	    {
 	      if (! ((*info->callbacks->undefined_symbol)
-		     (info, h->root.root.string, input_bfd, input_section,
+		     (info, h->root.root.root.string, input_bfd, input_section,
 		      rel->r_vaddr - input_section->vma)))
 		return false;
 	    }
@@ -1001,6 +1193,17 @@ coff_ppc_relocate_section (output_bfd, info, input_bfd, input_section,
 		  }
 	      }
 
+#if 0
+	    if ( r_flags & IMAGE_REL_PPC_TOCDEFN )
+	      {
+		/* Somehow, we are to assume that the toc has already been
+		   done for this one, and the offset is the value of
+		   the symbol? */
+		fprintf(stderr,
+			"Symbol value %d\n", val);
+	      }
+#endif
+
 	    /* 
 	     *  Amazing bit tricks present. As we may have seen earlier, we
 	     *  use the 1 bit to tell us whether or not a toc offset has been
@@ -1036,6 +1239,7 @@ coff_ppc_relocate_section (output_bfd, info, input_bfd, input_section,
 		else
 		  {
 		    /* write out the toc entry */
+		    record_toc(toc_section, our_toc_offset, strdup(name));
 #ifdef TOC_DEBUG
 		    fprintf(stderr,
 			    "Writing out toc_offset toc_section (%p,%p)+%d val %d for %s\n", 
@@ -1056,8 +1260,9 @@ coff_ppc_relocate_section (output_bfd, info, input_bfd, input_section,
 	      }
 	    else
 	      {
-		const char *name = h->root.root.string;
+		const char *name = h->root.root.root.string;
 		our_toc_offset = h->toc_offset;
+
 		if ((our_toc_offset & 1) != 0)
 		  {
 		    /* if it has been written out, it is marked with the 
@@ -1072,6 +1277,8 @@ coff_ppc_relocate_section (output_bfd, info, input_bfd, input_section,
 		  }
 		else
 		  {
+		    record_toc(toc_section, our_toc_offset, strdup(name));
+
 #ifdef TOC_DEBUG
 		    /* write out the toc entry */
 		    fprintf(stderr,
@@ -1133,40 +1340,26 @@ coff_ppc_relocate_section (output_bfd, info, input_bfd, input_section,
 	  }
 	  break;
 	case IMAGE_REL_PPC_IFGLUE:
-	  /* To solve this, we need to know whether or not the symbol */
-	  /* appearing on the call instruction is a function included */
-	  /* in the link or not. If it is, then we leave the nop instruction */
-	  /* alone, and the reloc is done. */
-
-	  /* Actually, for dll support on NT, this is likely not necessary at
-	     all. For any library function, a glue code stub must be supplied
-	     to the linker, and the glue will take care of the toc reload */
-	  DUMP_RELOC2(howto->name, rel);
-#if 0
-	  if (h == 0) 
-	    {
-	      /* this better be a static function */
-		  fprintf(stderr,
-			  "It's a static function.... \n");
-	    }
-	  else
-	    {
-	      /* this is an externally visible function */
-	      /* is it present? */
-	      if (h->root.type == bfd_link_hash_defined
-		  || h->root.type == bfd_link_hash_defweak)
-		{
-		  fprintf(stderr,
-			  "The function is present. \n");
-		  ;
-		}
-	      else
-		{
-		  fprintf(stderr,
-			  "The function is not present. \n");
-		}
-	    }
-#endif
+	  {
+	    /* To solve this, we need to know whether or not the symbol */
+	    /* appearing on the call instruction is a glue function or not. */
+	    /* A glue function must announce itself via a IMGLUE reloc, and */
+	    /* the reloc contains the required toc restore instruction */
+	  
+	    bfd_vma x;
+	    const char *my_name;
+	    DUMP_RELOC2(howto->name, rel);
+
+	    if (h != 0)
+	      {
+		my_name = h->root.root.root.string;
+		if (h->symbol_is_glue == 1) 
+		  {
+		    x = bfd_get_32(input_bfd, loc);
+		    bfd_put_32(input_bfd, h->glue_insn, loc);
+		  }
+	      }
+	  }
 	  break;
 	case IMAGE_REL_PPC_SECREL:
 	  /* Unimplemented: codeview debugging information */
@@ -1180,13 +1373,14 @@ coff_ppc_relocate_section (output_bfd, info, input_bfd, input_section,
 	     symbol */
 	  break;
 	case IMAGE_REL_PPC_ABSOLUTE:
-	case IMAGE_REL_PPC_IMGLUE:
 	  {
 	    const char *my_name;
 	    if (h == 0)
 		my_name = (syms+symndx)->_n._n_name;
 	    else
-		my_name = h->root.root.string;
+	      {
+		my_name = h->root.root.root.string;
+	      }
 
 	    fprintf(stderr, 
 		    "Warning: unsupported reloc %s <file %s, section %s>\n", 
@@ -1198,6 +1392,23 @@ coff_ppc_relocate_section (output_bfd, info, input_bfd, input_section,
 		    rel->r_symndx, my_name, rel->r_vaddr, rel->r_vaddr);  
 	  }
 	  break;
+	case IMAGE_REL_PPC_IMGLUE:
+	  {
+	    /* There is nothing to do now. This reloc was noted in the first
+	       pass over the relocs, and the glue instruction extracted */
+	    const char *my_name;
+	    if (h->symbol_is_glue == 1) 
+	      break;
+	    my_name = h->root.root.root.string;
+	    fprintf(stderr, 
+		    "Warning: previously missed IMGLUE reloc %s <file %s, section %s>\n", 
+		    howto->name,
+		    bfd_get_filename(input_bfd),
+		    input_section->name);
+	    break;
+
+	  }
+	  break;
 
 	case IMAGE_REL_PPC_ADDR32NB:
 	  {
@@ -1213,7 +1424,7 @@ coff_ppc_relocate_section (output_bfd, info, input_bfd, input_section,
 	      {
 		char *target = 0;
 
-		name = h->root.root.string;
+		name = h->root.root.root.string;
 		if (strcmp(".idata$2", name) == 0)
 		  target = "__idata2_magic__";
 		else if (strcmp(".idata$4", name) == 0)
@@ -1234,15 +1445,18 @@ coff_ppc_relocate_section (output_bfd, info, input_bfd, input_section,
 		    abort();
 		  }
 
-		val = myh->root.u.def.value + sec->output_section->vma + sec->output_offset;
+		val = myh->root.u.def.value + 
+		  sec->output_section->vma + sec->output_offset;
 		if (first_thunk_address == 0)
 		  {
 		    int idata5offset;
 		    myh = coff_link_hash_lookup (coff_hash_table (info),
 						 "__idata5_magic__",
 						 false, false, true);
-		    first_thunk_address = myh->root.u.def.value + sec->output_section->vma + 
-		      sec->output_offset - pe_data(output_bfd)->pe_opthdr.ImageBase;
+		    first_thunk_address = myh->root.u.def.value + 
+		      sec->output_section->vma + 
+		      sec->output_offset - 
+			pe_data(output_bfd)->pe_opthdr.ImageBase;
 
 		    idata5offset = myh->root.u.def.value;
 		    myh = coff_link_hash_lookup (coff_hash_table (info),
@@ -1258,9 +1472,10 @@ coff_ppc_relocate_section (output_bfd, info, input_bfd, input_section,
 	      }
 
 	    rstat = _bfd_relocate_contents (howto,
-					    input_bfd, 
-					    val - pe_data(output_bfd)->pe_opthdr.ImageBase,
-					    loc);
+		      	      input_bfd, 
+			      val - 
+			      pe_data(output_bfd)->pe_opthdr.ImageBase,
+			      loc);
 	  }
 	  break;
 
@@ -1316,7 +1531,7 @@ coff_ppc_relocate_section (output_bfd, info, input_bfd, input_section,
 	    if (symndx == -1)
 	      name = "*ABS*";
 	    else if (h != NULL)
-	      name = h->root.root.string;
+	      name = h->root.root.root.string;
 	    else if (sym == NULL)
 	      name = "*unknown*";
 	    else if (sym->_n._n_n._n_zeroes == 0
@@ -1360,6 +1575,26 @@ long int import_table_size;
 long int first_thunk_address;
 long int thunk_size;
 
+struct list_ele *head;
+struct list_ele *tail;
+
+void
+dump_toc(vfile)
+     void *vfile;
+{
+  FILE *file = vfile;
+  struct list_ele *t;
+
+  fprintf(file, 
+	  " Offset Offset   Name if present\n");
+
+  for(t = head; t != 0; t=t->next)
+    {
+      fprintf(file,
+	      " %2x  %04lx    %s\n",
+	      t->offset - 32768, t->offset, t->name);
+    }
+}
 
 boolean
 ppc_allocate_toc_section (info) 
@@ -1455,20 +1690,20 @@ ppc_process_before_allocation (abfd, info)
 	unsigned short junk    = EXTRACT_JUNK (rel->r_type);
 
 #ifdef DEBUG_RELOC
-  /* now examine flags */
-  if (r_flags != 0) 
-    {
-      fprintf (stderr, "Reloc with flags found!");
-      if ( r_flags & IMAGE_REL_PPC_NEG ) 
-	fprintf (stderr, " NEG");
-      if ( r_flags & IMAGE_REL_PPC_BRTAKEN )
-	fprintf (stderr, " BRTAKEN");
-      if ( r_flags & IMAGE_REL_PPC_BRNTAKEN )
-	fprintf (stderr, " BRNTAKEN");
-      if ( r_flags & IMAGE_REL_PPC_TOCDEFN )
-	fprintf (stderr, " TOCDEFN");
-      fprintf(stderr, "\n");
-    }
+	/* now examine flags */
+	if (r_flags != 0) 
+	  {
+	    fprintf (stderr, "Reloc with flags found!");
+	    if ( r_flags & IMAGE_REL_PPC_NEG ) 
+	      fprintf (stderr, " NEG");
+	    if ( r_flags & IMAGE_REL_PPC_BRTAKEN )
+	      fprintf (stderr, " BRTAKEN");
+	    if ( r_flags & IMAGE_REL_PPC_BRNTAKEN )
+	      fprintf (stderr, " BRNTAKEN");
+	    if ( r_flags & IMAGE_REL_PPC_TOCDEFN )
+		fprintf (stderr, " TOCDEFN");
+	    fprintf(stderr, "\n");
+	  }
 #endif
 	
 	DUMP_RELOC2(ppc_coff_howto_table[r_type].name, rel);
@@ -1479,6 +1714,9 @@ ppc_process_before_allocation (abfd, info)
 	    toc_offset = ppc_record_toc_entry(abfd, info, sec, 
 					      rel->r_symndx, default_toc);
 	    break;
+	  case IMAGE_REL_PPC_IMGLUE:
+	    ppc_mark_symbol_as_glue(abfd, rel->r_symndx, rel);
+	    break;
 	  default:
 	    break;
 	  }
@@ -1779,8 +2017,6 @@ ppc_coff_rtype2howto (relent, internal)
       break;
     case IMAGE_REL_PPC_IMGLUE:
       DUMP_RELOC2(ppc_coff_howto_table[r_type].name, internal);
-      /* IMGLUE relocs have big numbers in them. Don't know what for yet. */
-      internal->r_vaddr = 0; /* make it zero for now */
       break;
     default:
       fprintf(stderr, 
@@ -1876,8 +2112,6 @@ fprintf(stderr,
       break;
     case IMAGE_REL_PPC_IMGLUE:
       DUMP_RELOC2(ppc_coff_howto_table[r_type].name, rel);
-      /* IMGLUE relocs have big numbers in them. Don't know what for yet. */
-      rel->r_vaddr = 0; /* make it zero for now */
       break;
     default:
       fprintf(stderr, 
@@ -2112,12 +2346,3 @@ TARGET_BIG_SYM =
 };
 
 #endif
-
-
-
-
-
-
-
-
-