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-rw-r--r--ldso/ldso/sh/elfinterp.c416
1 files changed, 416 insertions, 0 deletions
diff --git a/ldso/ldso/sh/elfinterp.c b/ldso/ldso/sh/elfinterp.c
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index 000000000..2a0ab9f7a
--- /dev/null
+++ b/ldso/ldso/sh/elfinterp.c
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+/* vi: set sw=4 ts=4: */
+/* SuperH ELF shared library loader suppport
+ *
+ * Copyright (C) 2002, Stefan Allius <allius@atecom.com> and
+ * Eddie C. Dost <ecd@atecom.com>
+ *
+ * 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. The name of the above contributors may not be
+ * used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS ``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 CONTRIBUTORS 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.
+ */
+
+#if defined (SUPPORT_LD_DEBUG) || defined (LD_DEBUG_SYMBOLS)
+static const char *_dl_reltypes_tab[] =
+{
+ [0] "R_SH_NONE", "R_SH_DIR32", "R_SH_REL32", "R_SH_DIR8WPN",
+ [4] "R_SH_IND12W", "R_SH_DIR8WPL", "R_SH_DIR8WPZ", "R_SH_DIR8BP",
+ [8] "R_SH_DIR8W", "R_SH_DIR8L",
+ [25] "R_SH_SWITCH16","R_SH_SWITCH32","R_SH_USES",
+ [28] "R_SH_COUNT", "R_SH_ALIGN", "R_SH_CODE", "R_SH_DATA",
+ [32] "R_SH_LABEL", "R_SH_SWITCH8", "R_SH_GNU_VTINHERIT","R_SH_GNU_VTENTRY",
+[160] "R_SH_GOT32", "R_SH_PLT32", "R_SH_COPY", "R_SH_GLOB_DAT",
+[164] "R_SH_JMP_SLOT","R_SH_RELATIVE","R_SH_GOTOFF", "R_SH_GOTPC",
+};
+
+static const char *
+_dl_reltypes(int type)
+{
+ static char buf[22];
+ const char *str;
+
+ if (type >= (sizeof (_dl_reltypes_tab)/sizeof(_dl_reltypes_tab[0])) ||
+ NULL == (str = _dl_reltypes_tab[type]))
+ {
+ str =_dl_simple_ltoa( buf, (unsigned long)(type));
+ }
+ return str;
+}
+
+static
+void debug_sym(Elf32_Sym *symtab,char *strtab,int symtab_index)
+{
+ if(_dl_debug_symbols)
+ {
+ if(symtab_index){
+ _dl_dprintf(_dl_debug_file, "\n%s\tvalue=%x\tsize=%x\tinfo=%x\tother=%x\tshndx=%x",
+ strtab + symtab[symtab_index].st_name,
+ symtab[symtab_index].st_value,
+ symtab[symtab_index].st_size,
+ symtab[symtab_index].st_info,
+ symtab[symtab_index].st_other,
+ symtab[symtab_index].st_shndx);
+ }
+ }
+}
+
+static void debug_reloc(Elf32_Sym *symtab,char *strtab, ELF_RELOC *rpnt)
+{
+ if(_dl_debug_reloc)
+ {
+ int symtab_index;
+ const char *sym;
+ symtab_index = ELF32_R_SYM(rpnt->r_info);
+ sym = symtab_index ? strtab + symtab[symtab_index].st_name : "sym=0x0";
+
+#ifdef ELF_USES_RELOCA
+ _dl_dprintf(_dl_debug_file, "\n%s\toffset=%x\taddend=%x %s",
+ _dl_reltypes(ELF32_R_TYPE(rpnt->r_info)),
+ rpnt->r_offset,
+ rpnt->r_addend,
+ sym);
+#else
+ _dl_dprintf(_dl_debug_file, "\n%s\toffset=%x %s",
+ _dl_reltypes(ELF32_R_TYPE(rpnt->r_info)),
+ rpnt->r_offset,
+ sym);
+#endif
+ }
+}
+#endif
+
+/* 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. */
+
+extern int _dl_linux_resolve(void);
+
+unsigned long _dl_linux_resolver(struct elf_resolve *tpnt, int reloc_entry)
+{
+ int reloc_type;
+ ELF_RELOC *this_reloc;
+ char *strtab;
+ Elf32_Sym *symtab;
+ int symtab_index;
+ char *rel_addr;
+ char *new_addr;
+ char **got_addr;
+ unsigned long instr_addr;
+
+ rel_addr = (char *) (tpnt->dynamic_info[DT_JMPREL] + tpnt->loadaddr);
+
+ this_reloc = (ELF_RELOC *) (rel_addr + reloc_entry);
+ reloc_type = ELF32_R_TYPE(this_reloc->r_info);
+ symtab_index = ELF32_R_SYM(this_reloc->r_info);
+
+ symtab = (Elf32_Sym *) (tpnt->dynamic_info[DT_SYMTAB] + tpnt->loadaddr);
+ strtab = (char *) (tpnt->dynamic_info[DT_STRTAB] + tpnt->loadaddr);
+
+ if (reloc_type != R_SH_JMP_SLOT) {
+ _dl_dprintf(2, "%s: Incorrect relocation type in jump relocations\n",
+ _dl_progname);
+ _dl_exit(1);
+ }
+
+ /* Address of jump instruction to fix up */
+ instr_addr = ((unsigned long) this_reloc->r_offset +
+ (unsigned long) tpnt->loadaddr);
+ got_addr = (char **) instr_addr;
+
+
+ /* Get the address of the GOT entry */
+ new_addr = _dl_find_hash(strtab + symtab[symtab_index].st_name,
+ tpnt->symbol_scope, tpnt, resolver);
+ if (!new_addr) {
+ _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) || defined (LD_NEVER_FIXUP_SYMBOLS)
+ if ((unsigned long) got_addr < 0x20000000)
+ {
+#ifndef SUPPORT_LD_DEBUG
+ if (_dl_debug_bindings)
+ {
+ _dl_dprintf(_dl_debug_file, "\nresolve function: %s",
+ strtab + symtab[symtab_index].st_name);
+ if(_dl_debug_detail) _dl_dprintf(_dl_debug_file, "\tpatch %x ==> %x @ %x", *got_addr, new_addr, got_addr);
+ }
+#endif
+#ifndef LD_NEVER_FIXUP_SYMBOLS
+ *got_addr = new_addr;
+#endif
+ } else {
+ *got_addr = new_addr;
+ }
+#else
+ *got_addr = new_addr;
+#endif
+
+ return (unsigned long) new_addr;
+}
+
+
+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, Elf32_Sym *symtab, char *strtab))
+{
+ int i;
+ char *strtab;
+ int goof = 0;
+ Elf32_Sym *symtab;
+ ELF_RELOC *rpnt;
+ int symtab_index;
+ /* Now parse the relocation information */
+
+ rpnt = (ELF_RELOC *) (rel_addr + tpnt->loadaddr);
+ rel_size = rel_size / sizeof(ELF_RELOC);
+
+ symtab = (Elf32_Sym *) (tpnt->dynamic_info[DT_SYMTAB] + tpnt->loadaddr);
+ strtab = (char *) (tpnt->dynamic_info[DT_STRTAB] + tpnt->loadaddr);
+
+ for (i = 0; i < rel_size; i++, rpnt++) {
+ int res;
+
+ symtab_index = ELF32_R_SYM(rpnt->r_info);
+
+ /* When the dynamic linker bootstrapped itself, it resolved some symbols.
+ Make sure we do not do them again */
+ if (!symtab_index && tpnt->libtype == program_interpreter)
+ continue;
+ if (symtab_index && tpnt->libtype == program_interpreter &&
+ _dl_symbol(strtab + symtab[symtab_index].st_name))
+ continue;
+
+#if defined (SUPPORT_LD_DEBUG)
+ debug_sym(symtab,strtab,symtab_index);
+ debug_reloc(symtab,strtab,rpnt);
+#endif
+
+ 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 = ELF32_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 '%s'\n");
+ goof += res;
+ }
+ }
+ return goof;
+}
+
+
+static int
+_dl_do_reloc (struct elf_resolve *tpnt,struct dyn_elf *scope,
+ ELF_RELOC *rpnt, Elf32_Sym *symtab, char *strtab)
+{
+ int reloc_type;
+ int symtab_index;
+ unsigned long *reloc_addr;
+ unsigned long symbol_addr;
+ int goof = 0;
+
+ reloc_addr = (unsigned long *) (tpnt->loadaddr + (unsigned long) rpnt->r_offset);
+ reloc_type = ELF32_R_TYPE(rpnt->r_info);
+ symtab_index = ELF32_R_SYM(rpnt->r_info);
+ symbol_addr = 0;
+
+ if (symtab_index) {
+
+
+ symbol_addr = (unsigned long) _dl_find_hash(strtab + symtab[symtab_index].st_name,
+ scope,
+ (reloc_type == R_SH_JMP_SLOT ? tpnt : NULL), symbolrel);
+
+ /*
+ * 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 && ELF32_ST_BIND(symtab[symtab_index].st_info) == STB_GLOBAL) {
+ goof++;
+ }
+ }
+
+
+#if defined (SUPPORT_LD_DEBUG)
+ {
+ unsigned long old_val = *reloc_addr;
+#endif
+ switch (reloc_type) {
+ case R_SH_NONE:
+ break;
+ case R_SH_COPY:
+ /* handled later on */
+ break;
+ case R_SH_DIR32:
+ *reloc_addr += symbol_addr + rpnt->r_addend;
+ break;
+ case R_SH_JMP_SLOT:
+ *reloc_addr = symbol_addr + rpnt->r_addend;
+ break;
+ case R_SH_REL32:
+ *reloc_addr += rpnt->r_addend -
+ (unsigned long) tpnt->loadaddr;
+ break;
+ case R_SH_RELATIVE:
+ *reloc_addr += (unsigned long) tpnt->loadaddr;
+ break;
+ default:
+ return -1; /*call _dl_exit(1) */
+ }
+#if defined (SUPPORT_LD_DEBUG)
+ if(_dl_debug_reloc && _dl_debug_detail)
+ _dl_dprintf(_dl_debug_file, "\tpatch: %x ==> %x @ %x", old_val, *reloc_addr, reloc_addr);
+ }
+
+#endif
+
+ return goof;
+}
+
+
+static int
+_dl_do_lazy_reloc (struct elf_resolve *tpnt, struct dyn_elf *scope,
+ ELF_RELOC *rpnt, Elf32_Sym *symtab, char *strtab)
+{
+ int reloc_type;
+ unsigned long *reloc_addr;
+
+ reloc_addr = (unsigned long *) (tpnt->loadaddr + (unsigned long) rpnt->r_offset);
+ reloc_type = ELF32_R_TYPE(rpnt->r_info);
+
+#if defined (SUPPORT_LD_DEBUG)
+ {
+ unsigned long old_val = *reloc_addr;
+#endif
+ switch (reloc_type) {
+ case R_SH_NONE:
+ break;
+ case R_SH_JMP_SLOT:
+ *reloc_addr += (unsigned long) tpnt->loadaddr;
+ break;
+ default:
+ return -1; /*call _dl_exit(1) */
+ }
+#if defined (SUPPORT_LD_DEBUG)
+ if(_dl_debug_reloc && _dl_debug_detail)
+ _dl_dprintf(_dl_debug_file, "\tpatch: %x ==> %x @ %x", old_val, *reloc_addr, reloc_addr);
+ }
+
+#endif
+ return 0;
+
+}
+
+/* This is done as a separate step, because there are cases where
+ information is first copied and later initialized. This results in
+ the wrong information being copied. Someone at Sun was complaining about
+ a bug in the handling of _COPY by SVr4, and this may in fact be what he
+ was talking about. Sigh. */
+
+/* No, there are cases where the SVr4 linker fails to emit COPY relocs
+ at all */
+static int
+_dl_do_copy (struct elf_resolve *tpnt, struct dyn_elf *scope,
+ ELF_RELOC *rpnt, Elf32_Sym *symtab, char *strtab)
+{
+ int reloc_type;
+ int symtab_index;
+ unsigned long *reloc_addr;
+ unsigned long symbol_addr;
+ int goof = 0;
+
+ reloc_addr = (unsigned long *) (tpnt->loadaddr + (unsigned long) rpnt->r_offset);
+ reloc_type = ELF32_R_TYPE(rpnt->r_info);
+ if (reloc_type != R_SH_COPY)
+ return 0;
+ symtab_index = ELF32_R_SYM(rpnt->r_info);
+ symbol_addr = 0;
+
+ if (symtab_index) {
+
+ symbol_addr = (unsigned long) _dl_find_hash(strtab +
+ symtab[symtab_index].st_name, scope,
+ NULL, copyrel);
+ if (!symbol_addr) goof++;
+ }
+ if (!goof) {
+#if defined (SUPPORT_LD_DEBUG)
+ if(_dl_debug_move)
+ _dl_dprintf(_dl_debug_file,"\n%s move %x bytes from %x to %x",
+ strtab + symtab[symtab_index].st_name,
+ symtab[symtab_index].st_size,
+ symbol_addr, symtab[symtab_index].st_value);
+#endif
+ _dl_memcpy((char *) symtab[symtab_index].st_value,
+ (char *) symbol_addr, symtab[symtab_index].st_size);
+ }
+
+ return goof;
+}
+
+
+void _dl_parse_lazy_relocation_information(struct elf_resolve *tpnt,
+ unsigned long rel_addr, unsigned long rel_size, int type)
+{
+ (void)_dl_parse(tpnt, NULL, rel_addr, rel_size, _dl_do_lazy_reloc);
+}
+
+int _dl_parse_relocation_information(struct elf_resolve *tpnt,
+ unsigned long rel_addr, unsigned long rel_size, int type)
+{
+ return _dl_parse(tpnt, tpnt->symbol_scope, rel_addr, rel_size, _dl_do_reloc);
+}
+
+int _dl_parse_copy_information(struct dyn_elf *xpnt, unsigned long rel_addr,
+ unsigned long rel_size, int type)
+{
+ return _dl_parse(xpnt->dyn, xpnt->next, rel_addr, rel_size, _dl_do_copy);
+}
+
+
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