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authordfr <dfr@FreeBSD.org>1998-09-04 19:03:57 +0000
committerdfr <dfr@FreeBSD.org>1998-09-04 19:03:57 +0000
commitb5ab30c0dc5fcbceebb8fe7939b9b22b365dbb81 (patch)
treeb5d0a554c070d669d34d1dd16aedbdc80ac19468 /libexec/rtld-elf/alpha/reloc.c
parentcc6d00dd2e04653dd42a1e017648ef5a6865205e (diff)
downloadFreeBSD-src-b5ab30c0dc5fcbceebb8fe7939b9b22b365dbb81.zip
FreeBSD-src-b5ab30c0dc5fcbceebb8fe7939b9b22b365dbb81.tar.gz
Add alpha support.
Submitted by: John Birrell <jb@cimlogic.com.au> (with extra hacks by me) Obtained from: Probably NetBSD
Diffstat (limited to 'libexec/rtld-elf/alpha/reloc.c')
-rw-r--r--libexec/rtld-elf/alpha/reloc.c309
1 files changed, 309 insertions, 0 deletions
diff --git a/libexec/rtld-elf/alpha/reloc.c b/libexec/rtld-elf/alpha/reloc.c
new file mode 100644
index 0000000..e43b12a
--- /dev/null
+++ b/libexec/rtld-elf/alpha/reloc.c
@@ -0,0 +1,309 @@
+/*-
+ * 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");
+
+extern Elf_Dyn _DYNAMIC;
+
+/* Relocate a non-PLT object with addend. */
+static int
+reloc_non_plt_obj(Obj_Entry *obj_rtld, const Obj_Entry *obj,
+ const Elf_Rela *rela)
+{
+ Elf_Addr *where = (Elf_Addr *) (obj->relocbase + rela->r_offset);
+
+ switch (ELF_R_TYPE(rela->r_info)) {
+
+ case R_ALPHA_REFQUAD: {
+ const Elf_Sym *def;
+ const Obj_Entry *defobj;
+ Elf_Addr tmp_value;
+
+ def = find_symdef(ELF_R_SYM(rela->r_info), obj,
+ &defobj, false);
+ if (def == NULL)
+ return -1;
+
+ tmp_value = (Elf_Addr) (defobj->relocbase +
+ def->st_value) + *where + rela->r_addend;
+ if (*where != tmp_value)
+ *where = tmp_value;
+ }
+ break;
+
+ case R_ALPHA_GLOB_DAT: {
+ const Elf_Sym *def;
+ const Obj_Entry *defobj;
+
+ def = find_symdef(ELF_R_SYM(rela->r_info), obj,
+ &defobj, false);
+ if (def == NULL)
+ return -1;
+
+ if (*where != (Elf_Addr) (defobj->relocbase +
+ def->st_value))
+ *where = (Elf_Addr) (defobj->relocbase +
+ def->st_value);
+ }
+ break;
+
+ case R_ALPHA_RELATIVE: {
+ if (obj != obj_rtld ||
+ (caddr_t)where < (caddr_t)_GLOBAL_OFFSET_TABLE_ ||
+ (caddr_t)where >= (caddr_t)&_DYNAMIC)
+ *where += (Elf_Addr) obj->relocbase;
+ }
+ break;
+
+ case R_ALPHA_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_COPY "
+ " relocation in shared library",
+ obj->path);
+ return -1;
+ }
+ }
+ break;
+
+ default:
+ _rtld_error("%s: Unsupported relocation type %d"
+ " in non-PLT relocations\n", obj->path,
+ ELF_R_TYPE(rela->r_info));
+ return -1;
+ }
+ 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;
+ const Elf_Rela *relalim;
+ const Elf_Rela *rela;
+
+ /* Perform relocations without addend if there are any: */
+ rellim = (const Elf_Rel *) ((caddr_t) obj->rel + obj->relsize);
+ for (rel = obj->rel; obj->rel != NULL && rel < rellim; rel++) {
+ Elf_Rela locrela;
+
+ locrela.r_info = rel->r_info;
+ locrela.r_offset = rel->r_offset;
+ locrela.r_addend = 0;
+ if (reloc_non_plt_obj(obj_rtld, obj, &locrela))
+ return -1;
+ }
+
+ /* Perform relocations with addend if there are any: */
+ relalim = (const Elf_Rela *) ((caddr_t) obj->rela + obj->relasize);
+ for (rela = obj->rela; obj->rela != NULL && rela < relalim; rela++) {
+ if (reloc_non_plt_obj(obj_rtld, obj, rela))
+ 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;
+ const Elf_Rela *relalim;
+ const Elf_Rela *rela;
+
+ /* Process the PLT relocations without addend if there are any. */
+ rellim = (const Elf_Rel *) ((caddr_t) obj->pltrel + obj->pltrelsize);
+ if (bind_now) {
+ /* Fully resolve procedure addresses now */
+ for (rel = obj->pltrel; obj->pltrel != NULL && 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_ALPHA_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; obj->pltrel != NULL && rel < rellim;
+ rel++) {
+ Elf_Addr *where = (Elf_Addr *)
+ (obj->relocbase + rel->r_offset);
+ *where += (Elf_Addr) obj->relocbase;
+ }
+ }
+
+ /* Process the PLT relocations with addend if there are any. */
+ relalim = (const Elf_Rela *) ((caddr_t) obj->pltrela +
+ obj->pltrelasize);
+ if (bind_now) {
+ /* Fully resolve procedure addresses now */
+ for (rela = obj->pltrela; obj->pltrela != NULL && rela < relalim;
+ rel++) {
+ Elf_Addr *where = (Elf_Addr *) (obj->relocbase +
+ rela->r_offset);
+ const Elf_Sym *def;
+ const Obj_Entry *defobj;
+
+ assert(ELF_R_TYPE(rela->r_info) == R_ALPHA_JMP_SLOT);
+
+ def = find_symdef(ELF_R_SYM(rela->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 (rela = obj->pltrela; obj->pltrela != NULL && rela < relalim;
+ rela++) {
+ Elf_Addr *where = (Elf_Addr *)
+ (obj->relocbase + rela->r_offset);
+ *where += (Elf_Addr) obj->relocbase;
+ }
+ }
+ return 0;
+}
+
+/* Process an R_ALPHA_COPY relocation. */
+static int
+do_copy_relocation(Obj_Entry *dstobj, const Elf_Rela *rela)
+{
+ 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 + rela->r_offset);
+ dstsym = dstobj->symtab + ELF_R_SYM(rela->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 special R_ALPHA_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;
+ const Elf_Rela *relalim;
+ const Elf_Rela *rela;
+
+ assert(dstobj->mainprog); /* COPY relocations are invalid elsewhere */
+
+ rellim = (const Elf_Rel *) ((caddr_t) dstobj->rel + dstobj->relsize);
+ for (rel = dstobj->rel; dstobj->rel != NULL && rel < rellim; rel++) {
+ if (ELF_R_TYPE(rel->r_info) == R_ALPHA_COPY) {
+ Elf_Rela locrela;
+
+ locrela.r_info = rel->r_info;
+ locrela.r_offset = rel->r_offset;
+ locrela.r_addend = 0;
+ if (do_copy_relocation(dstobj, &locrela))
+ return -1;
+ }
+ }
+
+ relalim = (const Elf_Rela *) ((caddr_t) dstobj->rela +
+ dstobj->relasize);
+ for (rela = dstobj->rela; dstobj->rela != NULL && rela < relalim;
+ rela++) {
+ if (ELF_R_TYPE(rela->r_info) == R_ALPHA_COPY) {
+ if (do_copy_relocation(dstobj, rela))
+ return -1;
+ }
+ }
+
+ return 0;
+}
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