Add alpha support.

Submitted by: John Birrell <jb@cimlogic.com.au> (with extra hacks by me)
Obtained from: Probably NetBSD

1 files changed, 236 insertions, 0 deletions

diff --git a/libexec/rtld-elf/amd64/reloc.c b/libexec/rtld-elf/amd64/reloc.c
new file mode 100644
index 0000000..d34d892
--- /dev/null
+++ b/libexec/rtld-elf/amd64/reloc.c
@@ -0,0 +1,236 @@
+/*-
+ * Copyright 1996-1998 John D. Polstra.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *      $Id: rtld.c,v 1.3 1998/05/01 08:39:27 dfr Exp $
+ */
+
+/*
+ * Dynamic linker for ELF.
+ *
+ * John Polstra <jdp@polstra.com>.
+ */
+
+#include <sys/param.h>
+#include <sys/mman.h>
+
+#include <dlfcn.h>
+#include <err.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "debug.h"
+#include "rtld.h"
+
+/*
+ * Debugging support.
+ */
+
+#define assert(cond)	((cond) ? (void) 0 :\
+    (msg("oops: " __XSTRING(__LINE__) "\n"), abort()))
+#define msg(s)		(write(1, s, strlen(s)))
+#define trace()		msg("trace: " __XSTRING(__LINE__) "\n");
+
+/*
+ * Process the special R_386_COPY relocations in the main program.  These
+ * copy data from a shared object into a region in the main program's BSS
+ * segment.
+ *
+ * Returns 0 on success, -1 on failure.
+ */
+int
+do_copy_relocations(Obj_Entry *dstobj)
+{
+    const Elf_Rel *rellim;
+    const Elf_Rel *rel;
+
+    assert(dstobj->mainprog);	/* COPY relocations are invalid elsewhere */
+
+    rellim = (const Elf_Rel *) ((caddr_t) dstobj->rel + dstobj->relsize);
+    for (rel = dstobj->rel;  rel < rellim;  rel++) {
+	if (ELF_R_TYPE(rel->r_info) == R_386_COPY) {
+	    void *dstaddr;
+	    const Elf_Sym *dstsym;
+	    const char *name;
+	    unsigned long hash;
+	    size_t size;
+	    const void *srcaddr;
+	    const Elf_Sym *srcsym;
+	    Obj_Entry *srcobj;
+
+	    dstaddr = (void *) (dstobj->relocbase + rel->r_offset);
+	    dstsym = dstobj->symtab + ELF_R_SYM(rel->r_info);
+	    name = dstobj->strtab + dstsym->st_name;
+	    hash = elf_hash(name);
+	    size = dstsym->st_size;
+
+	    for (srcobj = dstobj->next;  srcobj != NULL;  srcobj = srcobj->next)
+		if ((srcsym = symlook_obj(name, hash, srcobj, false)) != NULL)
+		    break;
+
+	    if (srcobj == NULL) {
+		_rtld_error("Undefined symbol \"%s\" referenced from COPY"
+		  " relocation in %s", name, dstobj->path);
+		return -1;
+	    }
+
+	    srcaddr = (const void *) (srcobj->relocbase + srcsym->st_value);
+	    memcpy(dstaddr, srcaddr, size);
+	}
+    }
+
+    return 0;
+}
+
+/* Process the non-PLT relocations. */
+int
+reloc_non_plt(Obj_Entry *obj, Obj_Entry *obj_rtld)
+{
+	const Elf_Rel *rellim;
+	const Elf_Rel *rel;
+
+	rellim = (const Elf_Rel *) ((caddr_t) obj->rel + obj->relsize);
+	for (rel = obj->rel;  rel < rellim;  rel++) {
+	    Elf_Addr *where = (Elf_Addr *) (obj->relocbase + rel->r_offset);
+
+	    switch (ELF_R_TYPE(rel->r_info)) {
+
+	    case R_386_NONE:
+		break;
+
+	    case R_386_32:
+		{
+		    const Elf_Sym *def;
+		    const Obj_Entry *defobj;
+
+		    def = find_symdef(ELF_R_SYM(rel->r_info), obj, &defobj,
+		      false);
+		    if (def == NULL)
+			return -1;
+
+		    *where += (Elf_Addr) (defobj->relocbase + def->st_value);
+		}
+		break;
+
+	    case R_386_PC32:
+		/*
+		 * I don't think the dynamic linker should ever see this
+		 * type of relocation.  But the binutils-2.6 tools sometimes
+		 * generate it.
+		 */
+		{
+		    const Elf_Sym *def;
+		    const Obj_Entry *defobj;
+
+		    def = find_symdef(ELF_R_SYM(rel->r_info), obj, &defobj,
+		      false);
+		    if (def == NULL)
+			return -1;
+
+		    *where +=
+		      (Elf_Addr) (defobj->relocbase + def->st_value) -
+		      (Elf_Addr) where;
+		}
+		break;
+
+	    case R_386_COPY:
+		/*
+		 * These are deferred until all other relocations have
+		 * been done.  All we do here is make sure that the COPY
+		 * relocation is not in a shared library.  They are allowed
+		 * only in executable files.
+		 */
+		if (!obj->mainprog) {
+		    _rtld_error("%s: Unexpected R_386_COPY relocation"
+		      " in shared library", obj->path);
+		    return -1;
+		}
+		break;
+
+	    case R_386_GLOB_DAT:
+		{
+		    const Elf_Sym *def;
+		    const Obj_Entry *defobj;
+
+		    def = find_symdef(ELF_R_SYM(rel->r_info), obj, &defobj,
+		      false);
+		    if (def == NULL)
+			return -1;
+
+		    *where = (Elf_Addr) (defobj->relocbase + def->st_value);
+		}
+		break;
+
+	    case R_386_RELATIVE:
+		*where += (Elf_Addr) obj->relocbase;
+		break;
+
+	    default:
+		_rtld_error("%s: Unsupported relocation type %d"
+		  " in non-PLT relocations\n", obj->path,
+		  ELF_R_TYPE(rel->r_info));
+		return -1;
+	    }
+	}
+    return 0;
+}
+
+/* Process the PLT relocations. */
+int
+reloc_plt(Obj_Entry *obj, bool bind_now)
+{
+	const Elf_Rel *rellim;
+	const Elf_Rel *rel;
+
+	/* Process the PLT relocations. */
+	rellim = (const Elf_Rel *) ((caddr_t) obj->pltrel + obj->pltrelsize);
+	if (bind_now) {
+	    /* Fully resolve procedure addresses now */
+	    for (rel = obj->pltrel;  rel < rellim;  rel++) {
+		Elf_Addr *where = (Elf_Addr *)
+		  (obj->relocbase + rel->r_offset);
+		const Elf_Sym *def;
+		const Obj_Entry *defobj;
+
+		assert(ELF_R_TYPE(rel->r_info) == R_386_JMP_SLOT);
+
+		def = find_symdef(ELF_R_SYM(rel->r_info), obj, &defobj, true);
+		if (def == NULL)
+		    return -1;
+
+		*where = (Elf_Addr) (defobj->relocbase + def->st_value);
+	    }
+	} else {	/* Just relocate the GOT slots pointing into the PLT */
+	    for (rel = obj->pltrel;  rel < rellim;  rel++) {
+		Elf_Addr *where = (Elf_Addr *)
+		  (obj->relocbase + rel->r_offset);
+		*where += (Elf_Addr) obj->relocbase;
+	    }
+	}
+    return 0;
+}