XEmacs 21.2-b1

[chise/xemacs-chise.git.1] / dynodump / i386 / _relocate.c

diff --git a/dynodump/i386/_relocate.c b/dynodump/i386/_relocate.c
new file mode 100644 (file)
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+++ b/dynodump/i386/_relocate.c
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+/*
+ *     Copyright (c) 1995 by Sun Microsystems, Inc.
+ *     All rights reserved.
+ *
+ * This source code is a product of Sun Microsystems, Inc. and is provided
+ * for unrestricted use provided that this legend is included on all tape
+ * media and as a part of the software program in whole or part.  Users
+ * may copy or modify this source code without charge, but are not authorized
+ * to license or distribute it to anyone else except as part of a product or
+ * program developed by the user.
+ *
+ * THIS PROGRAM CONTAINS SOURCE CODE COPYRIGHTED BY SUN MICROSYSTEMS, INC.
+ * SUN MICROSYSTEMS, INC., MAKES NO REPRESENTATIONS ABOUT THE SUITABLITY
+ * OF SUCH SOURCE CODE FOR ANY PURPOSE.  IT IS PROVIDED "AS IS" WITHOUT
+ * EXPRESS OR IMPLIED WARRANTY OF ANY KIND.  SUN MICROSYSTEMS, INC. DISCLAIMS
+ * ALL WARRANTIES WITH REGARD TO SUCH SOURCE CODE, INCLUDING ALL IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  IN
+ * NO EVENT SHALL SUN MICROSYSTEMS, INC. BE LIABLE FOR ANY SPECIAL, INDIRECT,
+ * INCIDENTAL, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
+ * FROM USE OF SUCH SOURCE CODE, REGARDLESS OF THE THEORY OF LIABILITY.
+ * 
+ * This source code is provided with no support and without any obligation on
+ * the part of Sun Microsystems, Inc. to assist in its use, correction, 
+ * modification or enhancement.
+ *
+ * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
+ * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY THIS
+ * SOURCE CODE OR ANY PART THEREOF.
+ *
+ * Sun Microsystems, Inc.
+ * 2550 Garcia Avenue
+ * Mountain View, California 94043
+ */
+
+#pragma ident  "@(#) $Id: _relocate.c,v 1.3 1997/05/29 04:23:02 steve Exp $ - SMI"
+
+/* LINTLIBRARY */
+
+#include       <libelf.h>
+#include       <string.h>
+#include       <machdep.h>
+#include       "_dynodump.h"
+
+void
+update_reloc(Cache *ocache, Cache *_ocache,
+            Cache *icache, Cache *_icache,
+            Half shnum)
+{
+    Shdr *shdr;
+    Rel *rels;
+    int reln, cnt;
+    Cache *orcache, *ircache;
+
+    /*
+     * Set up to readh the output relocation table.
+     */
+    shdr = _ocache->c_shdr;
+    rels = (Rel *) _ocache->c_data->d_buf;
+    reln = shdr->sh_size / shdr->sh_entsize;
+
+    /*
+     * Determine the section that is being relocated.
+     */
+    orcache = &ocache[shdr->sh_info];
+    shdr = _icache->c_shdr;
+    ircache = &icache[shdr->sh_info];
+
+    /*
+     * Determine the section that is being relocated.  Note that for this
+     * stupid architecture the .rel.plt actually contains offsets into the
+     * .got.
+     */
+    if (strcmp(_ocache->c_name, ".rel.plt")) {
+       orcache = &ocache[shdr->sh_info];
+       shdr = _icache->c_shdr;
+       ircache = &icache[shdr->sh_info];
+    } else {
+       Half    ndx;
+       Cache * __ocache = ocache;
+
+       for (__ocache++, ndx = 1; ndx != shnum; ndx++, __ocache++) {
+           if (strcmp(__ocache->c_name, ".got") == 0) {
+               orcache = __ocache;
+               ircache = &icache[ndx];
+               break;
+           }
+       }
+    }
+
+    /*
+     * Loop through the relocation table.
+     */
+    for (cnt = 0; cnt < reln; cnt++, rels++) {
+       unsigned char *iaddr, *oaddr;
+       Addr off;
+       unsigned char type = ELF_R_TYPE(rels->r_info);
+
+       /*
+        * Ignore some relocations as these can be safely carried out
+        * twice (they simply override any existing data).  In fact,
+        * some relocations like __iob's copy relocation must be carried
+        * out each time the process restarts, otherwise stdio blows up.
+        */
+       if ((type == R_386_COPY) || (type == R_386_NONE))
+           continue;
+
+       /*
+        * If we are required to restore the relocation location
+        * to its value prior to relocation, then read the
+        * location's original contents from the input image and
+        * copy it to the output image.
+        */
+       off = rels->r_offset - ircache->c_shdr->sh_addr;
+       iaddr = (unsigned char *) ircache->c_data->d_buf + off;
+       oaddr = (unsigned char *) orcache->c_data->d_buf + off;
+       *(unsigned long *) oaddr = *(unsigned long *) iaddr;
+    }
+}