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Diffstat (limited to 'ldso/ldso/cris/elfinterp.c')
-rw-r--r--ldso/ldso/cris/elfinterp.c401
1 files changed, 401 insertions, 0 deletions
diff --git a/ldso/ldso/cris/elfinterp.c b/ldso/ldso/cris/elfinterp.c
new file mode 100644
index 000000000..9a0b42635
--- /dev/null
+++ b/ldso/ldso/cris/elfinterp.c
@@ -0,0 +1,401 @@
+/*
+ * CRIS ELF shared library loader support.
+ *
+ * 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.
+ *
+ * Copyright (C) 2002, Axis Communications AB
+ * All rights reserved
+ *
+ * Author: Tobias Anderberg, <tobiasa@axis.com>
+ *
+ * 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.
+ */
+
+#ifndef VERBOSE_DLINKER
+#define VERBOSE_DLINKER
+#endif
+
+/* Support for the LD_DEBUG variable. */
+#if defined (SUPPORT_LD_DEBUG) || defined (LD_DEBUG_SYMBOLS)
+static const char *_dl_reltypes_tab[] = {
+ [0] "R_CRIS_NONE", "R_CRIS_8", "R_CRIS_16", "R_CRIS_32",
+ [4] "R_CRIS_8_PCREL", "R_CRIS_16_PCREL", "R_CRIS_32_PCREL", "R_CRIS_GNU_VTINHERIT",
+ [8] "R_CRIS_GNU_VTENTRY", "R_CRIS_COPY", "R_CRIS_GLOB_DAT", "R_CRIS_JUMP_SLOT",
+ [16] "R_CRIS_RELATIVE", "R_CRIS_16_GOT", "R_CRIS_32_GOT", "R_CRIS_16_GOTPLT",
+ [32] "R_CRIS_32_GOTPLT", "R_CRIS_32_GOTREL", "R_CRIS_32_PLT_GOTREL", "R_CRIS_32_PLT_PCREL",
+};
+
+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
+
+/* Defined in resolve.S */
+extern int _dl_linux_resolve(void);
+
+unsigned long
+_dl_linux_resolver(struct elf_resolve *tpnt, int reloc_offset)
+{
+
+ int reloc_type;
+ int symtab_index;
+ char *strtab;
+ char *new_addr;
+ char **got_addr;
+ ELF_RELOC *reloc;
+ Elf32_Sym *symtab;
+ Elf32_Addr instr_addr;
+
+ reloc = (ELF_RELOC *) (tpnt->dynamic_info[DT_JMPREL] + tpnt->loadaddr) + (reloc_offset >> 3);
+
+ reloc_type = ELF32_R_TYPE(reloc->r_info);
+ symtab_index = ELF32_R_SYM(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_CRIS_JUMP_SLOT) {
+ _dl_dprintf(_dl_debug_file, "%s: Incorrect relocation type for jump relocations.\n", _dl_progname);
+ _dl_exit(1);
+ }
+
+ /* Fetch the address of the jump instruction to fix up. */
+ instr_addr = ((Elf32_Addr) reloc->r_offset + (Elf32_Addr) tpnt->loadaddr);
+ got_addr = (char **) instr_addr;
+
+#ifdef DL_DEBUG_SYMBOLS
+ _dl_dprintf(_dl_debug_file, "Resolving symbol: %s\n", strtab + symtab[symtab_index].st_name);
+#endif
+
+ /* Fetch the address of the GOT entry. */
+ new_addr = _dl_find_hash(strtab + symtab[symtab_index].st_name, tpnt->symbol_scope, tpnt, 0);
+
+ if (!new_addr) {
+ _dl_dprintf(_dl_debug_file, "%s: Can't resolv symbol '%s'\n", _dl_progname, strtab + symtab[symtab_index].st_name);
+ _dl_exit(1);
+ }
+
+#if defined (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
+
+ *got_addr = new_addr;
+ return (unsigned long) new_addr;
+}
+
+void
+_dl_parse_lazy_relocation_information(struct elf_resolve *tpnt, unsigned long rel_addr, unsigned long rel_size, int type)
+{
+ int i;
+ int reloc_type;
+ int symtab_index;
+ char *strtab;
+ Elf32_Sym *symtab;
+ ELF_RELOC *rpnt;
+ Elf32_Addr *reloc_addr;
+
+ /* Parse 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++) {
+ reloc_addr = (Elf32_Addr *) (tpnt->loadaddr + (Elf32_Addr) rpnt->r_offset);
+ reloc_type = ELF32_R_TYPE(rpnt->r_info);
+ symtab_index = ELF32_R_SYM(rpnt->r_info);
+
+ /*
+ * Make sure we don't resolv the same symbols as we did
+ * when ld.so bootstrapped itself.
+ */
+ 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) || defined (LD_DEBUG_SYMBOLS)
+ {
+ unsigned long old_val = *reloc_addr;
+
+#endif
+
+ switch (reloc_type) {
+ case R_CRIS_NONE:
+ break;
+ case R_CRIS_JUMP_SLOT:
+ *reloc_addr += (Elf32_Addr) tpnt->loadaddr;
+ break;
+ default:
+ _dl_dprintf(_dl_debug_file, "%s: Can't handle relocation type (lazy).\n",
+ _dl_progname);
+#ifdef SUPPORT_LD_DEBUG
+ _dl_dprintf(_dl_debug_file, "%s ", _dl_reltypes(reloc_type));
+#endif
+ if (symtab_index)
+ _dl_dprintf(_dl_debug_file, "'%s'\n", strtab + symtab[symtab_index].st_name);
+
+ _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
+ }
+}
+
+int
+_dl_parse_relocation_information(struct elf_resolve *tpnt, unsigned long rel_addr, unsigned long rel_size, int type)
+{
+ int i;
+ int goof;
+ int reloc_type;
+ int symtab_index;
+ char *strtab;
+ Elf32_Sym *symtab;
+ ELF_RELOC *rpnt;
+ Elf32_Addr *reloc_addr;
+ Elf32_Addr symbol_addr;
+
+ goof = 0;
+ 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++) {
+ reloc_addr = (Elf32_Addr *) (tpnt->loadaddr + (Elf32_Addr) 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 && tpnt->libtype == program_interpreter)
+ continue;
+
+ if (symtab_index) {
+ if (tpnt->libtype == program_interpreter &&
+ _dl_symbol(strtab + symtab[symtab_index].st_name))
+ continue;
+
+ if (symtab[symtab_index].st_shndx != SHN_UNDEF && ELF32_ST_BIND(symtab[symtab_index].st_info) == STB_LOCAL)
+ symbol_addr = (Elf32_Addr) tpnt->loadaddr;
+ else
+ symbol_addr = (Elf32_Addr) _dl_find_hash(strtab + symtab[symtab_index].st_name,
+ tpnt->symbol_scope, (reloc_type == R_CRIS_JUMP_SLOT ? tpnt : NULL), 0);
+
+ /*
+ * 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) {
+ _dl_dprintf(_dl_debug_file, "%s: Can't resolve '%s'\n",
+ _dl_progname, strtab + symtab[symtab_index].st_name);
+ goof++;
+ }
+
+ symbol_addr += rpnt->r_addend;
+ }
+
+#if defined(SUPPORT_LD_DEBUG)
+ {
+ unsigned long old_val = *reloc_addr;
+ debug_sym(symtab,strtab,symtab_index);
+ debug_reloc(symtab,strtab,rpnt);
+#endif
+
+ switch (reloc_type) {
+ case R_CRIS_GLOB_DAT:
+ case R_CRIS_JUMP_SLOT:
+ case R_CRIS_32:
+ *reloc_addr = symbol_addr;
+ break;
+ case R_CRIS_RELATIVE:
+ *reloc_addr = (Elf32_Addr) tpnt->loadaddr + rpnt->r_addend;
+ break;
+ case R_CRIS_COPY:
+ *reloc_addr = symbol_addr;
+ break;
+ case R_CRIS_8:
+ *(char *) reloc_addr = symbol_addr;
+ break;
+ case R_CRIS_16:
+ *(short *) reloc_addr = symbol_addr;
+ break;
+ case R_CRIS_8_PCREL:
+ *(char *) reloc_addr = symbol_addr + rpnt->r_addend - (Elf32_Addr) reloc_addr - 1;
+ break;
+ case R_CRIS_16_PCREL:
+ *(short *) reloc_addr = symbol_addr + rpnt->r_addend - (Elf32_Addr) reloc_addr - 2;
+ break;
+ case R_CRIS_32_PCREL:
+ *reloc_addr = symbol_addr + rpnt->r_addend - (Elf32_Addr) reloc_addr - 4;
+ break;
+ case R_CRIS_NONE:
+ break;
+ default:
+ _dl_dprintf(_dl_debug_file, "%s: Can't handle relocation type ", _dl_progname);
+#ifdef SUPPORT_LD_DEBUG
+ _dl_dprintf(_dl_debug_file, "%s\n", _dl_reltypes(reloc_type));
+#endif
+ if (symtab_index) {
+ _dl_dprintf(_dl_debug_file, "'%s'\n", strtab + symtab[symtab_index].st_name);
+ return -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;
+}
+
+/*
+ * This is done as a seperate step, because there are cases where
+ * information is first copied and later initialized. This results
+ * in the wrong information being copied.
+ */
+int
+_dl_parse_copy_information(struct dyn_elf *xpnt, unsigned long rel_addr, unsigned long rel_size, int type)
+{
+ int i;
+ int reloc_type;
+ int goof;
+ int symtab_index;
+ char *strtab;
+ struct elf_resolve *tpnt;
+ Elf32_Sym *symtab;
+ ELF_RELOC *rpnt;
+ Elf32_Addr *reloc_addr;
+ Elf32_Addr symbol_addr;
+
+ goof = 0;
+ tpnt = xpnt->dyn;
+
+ 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++) {
+ reloc_addr = (Elf32_Addr *) (tpnt->loadaddr + (Elf32_Addr) rpnt->r_offset);
+ reloc_type = ELF32_R_TYPE(rpnt->r_info);
+
+ if (reloc_type != R_CRIS_COPY)
+ continue;
+
+ symtab_index = ELF32_R_SYM(rpnt->r_info);
+ symbol_addr = 0;
+
+ if (!symtab_index && tpnt->libtype == program_interpreter)
+ continue;
+
+ if (symtab_index) {
+ if (tpnt->libtype == program_interpreter &&
+ _dl_symbol(strtab + symtab[symtab_index].st_name))
+ continue;
+
+ symbol_addr = (Elf32_Addr) _dl_find_hash(strtab +
+ symtab[symtab_index].st_name, xpnt->next, NULL, 1);
+
+ if (!symbol_addr) {
+ _dl_dprintf(_dl_debug_file, "%s: Can't resolv symbol '%s'\n",
+ _dl_progname, strtab + symtab[symtab_index].st_name);
+ 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;
+}
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