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-rw-r--r--ldso/ldso/bfin/elfinterp.c352
1 files changed, 352 insertions, 0 deletions
diff --git a/ldso/ldso/bfin/elfinterp.c b/ldso/ldso/bfin/elfinterp.c
new file mode 100644
index 000000000..792c45c21
--- /dev/null
+++ b/ldso/ldso/bfin/elfinterp.c
@@ -0,0 +1,352 @@
+/* Blackfin ELF shared library loader suppport
+ Copyright (C) 2003, 2004 Red Hat, Inc.
+ Contributed by Alexandre Oliva <aoliva@redhat.com>
+ Lots of code copied from ../i386/elfinterp.c, so:
+ Copyright (c) 1994-2000 Eric Youngdale, Peter MacDonald,
+ David Engel, Hongjiu Lu and Mitch D'Souza
+ Copyright (C) 2001-2002, Erik Andersen
+ All rights reserved.
+
+This file is part of uClibc.
+
+uClibc is free software; you can redistribute it and/or modify it
+under the terms of the GNU Lesser General Public License as
+published by the Free Software Foundation; either version 2.1 of the
+License, or (at your option) any later version.
+
+uClibc is distributed in the hope that it will be useful, but WITHOUT
+ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+Library General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public
+License along with uClibc; see the file COPYING.LIB. If not, write to
+the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139,
+USA. */
+
+#include <sys/cdefs.h> /* __attribute_used__ */
+
+/* Program to load an ELF binary on a linux system, and run it.
+ References to symbols in sharable libraries can be resolved by either
+ an ELF sharable library or a linux style of shared library. */
+
+/* Disclaimer: I have never seen any AT&T source code for SVr4, nor have
+ I ever taken any courses on internals. This program was developed using
+ information available through the book "UNIX SYSTEM V RELEASE 4,
+ Programmers guide: Ansi C and Programming Support Tools", which did
+ a more than adequate job of explaining everything required to get this
+ working. */
+
+struct funcdesc_value volatile *__attribute__((__visibility__("hidden")))
+_dl_linux_resolver (struct elf_resolve *tpnt, int reloc_entry)
+{
+ int reloc_type;
+ ELF_RELOC *this_reloc;
+ char *strtab;
+ ElfW(Sym) *symtab;
+ int symtab_index;
+ char *rel_addr;
+ struct elf_resolve *new_tpnt;
+ char *new_addr;
+ struct funcdesc_value funcval;
+ struct funcdesc_value volatile *got_entry;
+ char *symname;
+
+ rel_addr = (char *)tpnt->dynamic_info[DT_JMPREL];
+
+ this_reloc = (ELF_RELOC *)(intptr_t)(rel_addr + reloc_entry);
+ reloc_type = ELF_R_TYPE(this_reloc->r_info);
+ symtab_index = ELF_R_SYM(this_reloc->r_info);
+
+ symtab = (Elf32_Sym *) tpnt->dynamic_info[DT_SYMTAB];
+ strtab = (char *) tpnt->dynamic_info[DT_STRTAB];
+ symname= strtab + symtab[symtab_index].st_name;
+
+ if (reloc_type != R_BFIN_FUNCDESC_VALUE) {
+ _dl_dprintf(2, "%s: Incorrect relocation type in jump relocations\n",
+ _dl_progname);
+ _dl_exit(1);
+ }
+
+ /* Address of GOT entry fix up */
+ got_entry = (struct funcdesc_value *) DL_RELOC_ADDR(tpnt->loadaddr, this_reloc->r_offset);
+
+ /* Get the address to be used to fill in the GOT entry. */
+ new_addr = _dl_find_hash_mod(symname, tpnt->symbol_scope, NULL, 0,
+ &new_tpnt);
+ if (!new_addr) {
+ new_addr = _dl_find_hash_mod(symname, NULL, NULL, 0,
+ &new_tpnt);
+ if (!new_addr) {
+ _dl_dprintf(2, "%s: can't resolve symbol '%s'\n",
+ _dl_progname, symname);
+ _dl_exit(1);
+ }
+ }
+
+ funcval.entry_point = new_addr;
+ funcval.got_value = new_tpnt->loadaddr.got_value;
+
+#if defined (__SUPPORT_LD_DEBUG__)
+ if (_dl_debug_bindings) {
+ _dl_dprintf(_dl_debug_file, "\nresolve function: %s", symname);
+ if (_dl_debug_detail)
+ _dl_dprintf(_dl_debug_file,
+ "\n\tpatched (%x,%x) ==> (%x,%x) @ %x\n",
+ got_entry->entry_point, got_entry->got_value,
+ funcval.entry_point, funcval.got_value,
+ got_entry);
+ }
+ if (1 || !_dl_debug_nofixups) {
+ *got_entry = funcval;
+ }
+#else
+ *got_entry = funcval;
+#endif
+
+ return got_entry;
+}
+
+static int
+_dl_parse(struct elf_resolve *tpnt, struct dyn_elf *scope,
+ unsigned long rel_addr, unsigned long rel_size,
+ int (*reloc_fnc) (struct elf_resolve *tpnt, struct dyn_elf *scope,
+ ELF_RELOC *rpnt, ElfW(Sym) *symtab, char *strtab))
+{
+ unsigned int i;
+ char *strtab;
+ ElfW(Sym) *symtab;
+ ELF_RELOC *rpnt;
+ int symtab_index;
+
+ /* Now parse the relocation information */
+ rpnt = (ELF_RELOC *) rel_addr;
+ rel_size = rel_size / sizeof(ELF_RELOC);
+
+ symtab = (ElfW(Sym) *) tpnt->dynamic_info[DT_SYMTAB];
+ strtab = (char *) tpnt->dynamic_info[DT_STRTAB];
+
+ for (i = 0; i < rel_size; i++, rpnt++) {
+ int res;
+
+ symtab_index = ELF_R_SYM(rpnt->r_info);
+ debug_sym(symtab,strtab,symtab_index);
+ debug_reloc(symtab,strtab,rpnt);
+
+ res = reloc_fnc (tpnt, scope, rpnt, symtab, strtab);
+
+ if (res==0) continue;
+
+ _dl_dprintf(2, "\n%s: ",_dl_progname);
+
+ if (symtab_index)
+ _dl_dprintf(2, "symbol '%s': ", strtab + symtab[symtab_index].st_name);
+
+ if (res <0) {
+ int reloc_type = ELF_R_TYPE(rpnt->r_info);
+#if defined (__SUPPORT_LD_DEBUG__)
+ _dl_dprintf(2, "can't handle reloc type %s\n ", _dl_reltypes(reloc_type));
+#else
+ _dl_dprintf(2, "can't handle reloc type %x\n", reloc_type);
+#endif
+ _dl_exit(-res);
+ } else if (res >0) {
+ _dl_dprintf(2, "can't resolve symbol\n");
+ return res;
+ }
+ }
+ return 0;
+}
+
+static int
+_dl_do_reloc (struct elf_resolve *tpnt,struct dyn_elf *scope,
+ ELF_RELOC *rpnt, ElfW(Sym) *symtab, char *strtab)
+{
+ int reloc_type;
+ int symtab_index;
+ char *symname;
+ unsigned long reloc_value = 0, *reloc_addr;
+ struct { unsigned long v; } __attribute__((__packed__))
+ *reloc_addr_packed;
+ unsigned long symbol_addr;
+ struct elf_resolve *symbol_tpnt;
+ struct funcdesc_value funcval;
+#if defined (__SUPPORT_LD_DEBUG__)
+ unsigned long old_val;
+#endif
+
+ reloc_addr = (unsigned long *) DL_RELOC_ADDR(tpnt->loadaddr, rpnt->r_offset);
+ __asm__ ("" : "=r" (reloc_addr_packed) : "0" (reloc_addr));
+ reloc_type = ELF_R_TYPE(rpnt->r_info);
+ symtab_index = ELF_R_SYM(rpnt->r_info);
+ symbol_addr = 0;
+ symname = strtab + symtab[symtab_index].st_name;
+
+ if (ELF_ST_BIND (symtab[symtab_index].st_info) == STB_LOCAL) {
+ symbol_addr = (unsigned long) DL_RELOC_ADDR(tpnt->loadaddr, symtab[symtab_index].st_value);
+ symbol_tpnt = tpnt;
+ } else {
+
+ symbol_addr = (unsigned long)
+ _dl_find_hash_mod(symname, scope, NULL, 0, &symbol_tpnt);
+
+ /*
+ * We want to allow undefined references to weak symbols - this might
+ * have been intentional. We should not be linking local symbols
+ * here, so all bases should be covered.
+ */
+
+ if (!symbol_addr && ELF_ST_BIND(symtab[symtab_index].st_info) != STB_WEAK) {
+ _dl_dprintf (2, "%s: can't resolve symbol '%s'\n",
+ _dl_progname, strtab + symtab[symtab_index].st_name);
+ _dl_exit (1);
+ }
+ }
+
+#if defined (__SUPPORT_LD_DEBUG__)
+ if (_dl_debug_reloc && _dl_debug_detail)
+ {
+ if ((long)reloc_addr_packed & 3)
+ old_val = reloc_addr_packed->v;
+ else
+ old_val = *reloc_addr;
+ }
+ else
+ old_val = 0;
+#endif
+ switch (reloc_type) {
+ case R_BFIN_unused0:
+ break;
+ case R_BFIN_byte4_data:
+ if ((long)reloc_addr_packed & 3)
+ reloc_value = reloc_addr_packed->v += symbol_addr;
+ else
+ reloc_value = *reloc_addr += symbol_addr;
+ break;
+ case R_BFIN_FUNCDESC_VALUE:
+ funcval.entry_point = (void*)symbol_addr;
+ /* The addend of FUNCDESC_VALUE
+ relocations referencing global
+ symbols must be ignored, because it
+ may hold the address of a lazy PLT
+ entry. */
+ if (ELF_ST_BIND(symtab[symtab_index].st_info) == STB_LOCAL)
+ funcval.entry_point += *reloc_addr;
+ reloc_value = (unsigned long)funcval.entry_point;
+ if (symbol_addr)
+ funcval.got_value
+ = symbol_tpnt->loadaddr.got_value;
+ else
+ funcval.got_value = 0;
+ __asm__ ("%0 = %2; %1 = %H2;"
+ : "=m" (*(struct funcdesc_value *)reloc_addr), "=m" (((long *)reloc_addr)[1])
+ : "d" (funcval));
+ break;
+ case R_BFIN_FUNCDESC:
+ if ((long)reloc_addr_packed & 3)
+ reloc_value = reloc_addr_packed->v;
+ else
+ reloc_value = *reloc_addr;
+ if (symbol_addr)
+ reloc_value = (unsigned long)_dl_funcdesc_for
+ ((char *)symbol_addr + reloc_value,
+ symbol_tpnt->loadaddr.got_value);
+ else
+ reloc_value = 0;
+ if ((long)reloc_addr_packed & 3)
+ reloc_addr_packed->v = reloc_value;
+ else
+ *reloc_addr = reloc_value;
+ break;
+ default:
+ return -1;
+ }
+#if defined (__SUPPORT_LD_DEBUG__)
+ if (_dl_debug_reloc && _dl_debug_detail) {
+ _dl_dprintf(_dl_debug_file, "\tpatched: %x ==> %x @ %x", old_val, reloc_value, reloc_addr);
+ switch (reloc_type) {
+ case R_BFIN_FUNCDESC_VALUE:
+ _dl_dprintf(_dl_debug_file, " got %x", ((struct funcdesc_value *)reloc_value)->got_value);
+ break;
+ case R_BFIN_FUNCDESC:
+ if (! reloc_value)
+ break;
+ _dl_dprintf(_dl_debug_file, " funcdesc (%x,%x)",
+ ((struct funcdesc_value *)reloc_value)->entry_point,
+ ((struct funcdesc_value *)reloc_value)->got_value);
+ break;
+ }
+ }
+#endif
+
+ return 0;
+}
+
+static int
+_dl_do_lazy_reloc (struct elf_resolve *tpnt,
+ struct dyn_elf *scope __attribute__((unused)),
+ ELF_RELOC *rpnt, ElfW(Sym) *symtab __attribute__((unused)),
+ char *strtab __attribute__((unused)))
+{
+ int reloc_type;
+ struct funcdesc_value volatile *reloc_addr;
+ struct funcdesc_value funcval;
+#if defined (__SUPPORT_LD_DEBUG__)
+ unsigned long old_val;
+#endif
+
+ reloc_addr = (struct funcdesc_value *) DL_RELOC_ADDR(tpnt->loadaddr, rpnt->r_offset);
+ reloc_type = ELF_R_TYPE(rpnt->r_info);
+
+#if defined (__SUPPORT_LD_DEBUG__)
+ old_val = (unsigned long)reloc_addr->entry_point;
+#endif
+ switch (reloc_type) {
+ case R_BFIN_unused0:
+ break;
+ case R_BFIN_FUNCDESC_VALUE:
+ funcval = *reloc_addr;
+ funcval.entry_point = DL_RELOC_ADDR(tpnt->loadaddr, funcval.entry_point);
+ funcval.got_value = tpnt->loadaddr.got_value;
+ *reloc_addr = funcval;
+ break;
+ default:
+ return -1;
+ }
+#if defined (__SUPPORT_LD_DEBUG__)
+ if (_dl_debug_reloc && _dl_debug_detail)
+ _dl_dprintf(_dl_debug_file, "\tpatched: %x ==> %x @ %x", old_val, reloc_addr->entry_point, reloc_addr);
+#endif
+ return 0;
+
+}
+
+void
+_dl_parse_lazy_relocation_information
+(struct dyn_elf *rpnt, unsigned long rel_addr, unsigned long rel_size)
+{
+ _dl_parse(rpnt->dyn, NULL, rel_addr, rel_size, _dl_do_lazy_reloc);
+}
+
+int
+_dl_parse_relocation_information
+(struct dyn_elf *rpnt, unsigned long rel_addr, unsigned long rel_size)
+{
+ return _dl_parse(rpnt->dyn, rpnt->dyn->symbol_scope, rel_addr, rel_size, _dl_do_reloc);
+}
+
+/* We don't have copy relocs. */
+
+int
+_dl_parse_copy_information
+(struct dyn_elf *rpnt __attribute__((unused)),
+ unsigned long rel_addr __attribute__((unused)),
+ unsigned long rel_size __attribute__((unused)))
+{
+ return 0;
+}
+
+#ifndef LIBDL
+# include "../../libc/sysdeps/linux/bfin/crtreloc.c"
+#endif
+
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