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Diffstat (limited to 'ldso/ldso/nds32/elfinterp.c')
-rw-r--r--ldso/ldso/nds32/elfinterp.c315
1 files changed, 315 insertions, 0 deletions
diff --git a/ldso/ldso/nds32/elfinterp.c b/ldso/ldso/nds32/elfinterp.c
new file mode 100644
index 000000000..bf5c901d1
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+++ b/ldso/ldso/nds32/elfinterp.c
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+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+/* NDS32 ELF shared library loader suppport
+ *
+ * Copyright (C) 2001-2004 Erik Andersen
+ *
+ * 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.
+ */
+
+/* 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. */
+
+#include "ldso.h"
+
+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;
+ char *symname;
+ Elf32_Sym *symtab;
+ ELF_RELOC *rel_addr;
+ int symtab_index;
+ char *new_addr;
+ char **got_addr;
+ unsigned long instr_addr;
+
+ rel_addr = (ELF_RELOC *) tpnt->dynamic_info[DT_JMPREL];
+
+ this_reloc = rel_addr + reloc_entry/sizeof(ELF_RELOC);
+ 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];
+ strtab = (char *) tpnt->dynamic_info[DT_STRTAB];
+ symname = strtab + symtab[symtab_index].st_name;
+
+ if (unlikely(reloc_type != R_NDS32_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(symname, &_dl_loaded_modules->symbol_scope, tpnt,
+ ELF_RTYPE_CLASS_PLT, NULL);
+ if (unlikely(!new_addr)) {
+ _dl_dprintf(2, "%s: can't resolve symbol '%s'\n",
+ _dl_progname, symname);
+ _dl_exit(1);
+ }
+#if defined (__SUPPORT_LD_DEBUG__)
+ if ((unsigned long) got_addr < 0x40000000)
+ {
+ if (_dl_debug_bindings)
+ {
+ _dl_dprintf(_dl_debug_file, "\nresolve function: %s", symname);
+ if (_dl_debug_detail) _dl_dprintf(_dl_debug_file,
+ "\tpatch %x ==> %x @ %x", *got_addr, new_addr, got_addr);
+ }
+ }
+ if (!_dl_debug_nofixups) {
+ *got_addr = new_addr;
+ }
+#else
+ *got_addr = new_addr;
+#endif
+
+ return (unsigned long) new_addr;
+}
+
+static int
+_dl_parse(struct elf_resolve *tpnt, struct r_scope_elem *scope,
+ unsigned long rel_addr, unsigned long rel_size,
+ int (*reloc_fnc) (struct elf_resolve *tpnt, struct r_scope_elem *scope,
+ ELF_RELOC *rpnt, ElfW(Sym) *symtab, char *strtab))
+{
+ int symtab_index;
+ int i;
+ char *strtab;
+ int goof = 0;
+ ElfW(Sym) *symtab;
+ ELF_RELOC *rpnt;
+
+ /* Now parse the relocation information */
+ rpnt = (ELF_RELOC *) rel_addr;
+ rel_size = rel_size / sizeof(ELF_RELOC);
+
+ symtab = (Elf32_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 = ELF32_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 (unlikely(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);
+ }
+ if (unlikely(res >0))
+ {
+ _dl_dprintf(2, "can't resolve symbol\n");
+ goof += res;
+ }
+ }
+ return goof;
+}
+
+
+static int
+_dl_do_reloc (struct elf_resolve *tpnt, struct r_scope_elem *scope,
+ ELF_RELOC *rpnt, ElfW(Sym) *symtab, char *strtab)
+{
+ int reloc_type;
+ int symtab_index;
+ char *symname = NULL;
+ unsigned long *reloc_addr;
+ unsigned long symbol_addr;
+ int goof = 0;
+ struct symbol_ref sym_ref;
+
+ 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;
+ sym_ref.sym = &symtab[symtab_index];
+ sym_ref.tpnt = NULL;
+
+ if (symtab_index) {
+ symname = strtab + symtab[symtab_index].st_name;
+ symbol_addr = (unsigned long)_dl_find_hash(symname, scope, tpnt,
+ elf_machine_type_class(reloc_type), &sym_ref);
+
+ /*
+ * 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_WEAK) {
+ _dl_dprintf (2, "%s: can't resolve symbol '%s'\n",
+ _dl_progname, strtab + symtab[symtab_index].st_name);
+ _dl_exit (1);
+ }
+ }
+
+#define COPY_UNALIGNED_WORD(swp, twp, align) \
+ { \
+ void *__s = (swp), *__t = (twp); \
+ unsigned char *__s1 = __s, *__t1 = __t; \
+ unsigned short *__s2 = __s, *__t2 = __t; \
+ unsigned long *__s4 = __s, *__t4 = __t; \
+ switch ((align)) \
+ { \
+ case 0: \
+ *__t4 = *__s4; \
+ break; \
+ case 2: \
+ *__t2++ = *__s2++; \
+ *__t2 = *__s2; \
+ break; \
+ default: \
+ *__t1++ = *__s1++; \
+ *__t1++ = *__s1++; \
+ *__t1++ = *__s1++; \
+ *__t1 = *__s1; \
+ break; \
+ } \
+ }
+
+#if defined (__SUPPORT_LD_DEBUG__)
+ {
+ unsigned long old_val = *reloc_addr;
+#endif
+ symbol_addr += rpnt->r_addend ;
+ switch (reloc_type) {
+ case R_NDS32_NONE:
+ break;
+ case R_NDS32_32:
+ case R_NDS32_GLOB_DAT:
+ case R_NDS32_JMP_SLOT:
+ *reloc_addr = symbol_addr;
+ break;
+ case R_NDS32_32_RELA:
+ COPY_UNALIGNED_WORD (&symbol_addr, reloc_addr,(int) reloc_addr & 3);
+ break;
+#undef COPY_UNALIGNED_WORD
+ case R_NDS32_RELATIVE:
+ *reloc_addr = (unsigned long) tpnt->loadaddr + rpnt->r_addend;
+ break;
+ case R_NDS32_COPY:
+ _dl_memcpy((void *) reloc_addr,
+ (void *) symbol_addr, symtab[symtab_index].st_size);
+ 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 r_scope_elem *scope,
+ ELF_RELOC *rpnt, ElfW(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_NDS32_NONE:
+ break;
+ case R_NDS32_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;
+
+}
+
+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,
+ struct r_scope_elem *scope,
+ unsigned long rel_addr,
+ unsigned long rel_size)
+{
+ return _dl_parse(rpnt->dyn, scope, rel_addr,
+ rel_size, _dl_do_reloc);
+}
+
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