--- /dev/null
+/* vi: set sw=4 ts=4: */
+/* mips/mipsel ELF shared library loader suppport
+ *
+ Copyright (C) 2002, Steven J. Hill (sjhill@realitydiluted.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.
+ */
+
+#include "ldso.h"
+
+extern int _dl_runtime_resolve(void);
+extern int _dl_runtime_pltresolve(void);
+
+#define OFFSET_GP_GOT 0x7ff0
+
+unsigned long __dl_runtime_resolve(unsigned long sym_index,
+ unsigned long old_gpreg)
+{
+ unsigned long *got = (unsigned long *) (old_gpreg - OFFSET_GP_GOT);
+ struct elf_resolve *tpnt = (struct elf_resolve *) got[1];
+ ElfW(Sym) *sym;
+ char *strtab;
+ unsigned long local_gotno;
+ unsigned long gotsym;
+ unsigned long new_addr;
+ unsigned long instr_addr;
+ char **got_addr;
+ char *symname;
+
+ gotsym = tpnt->dynamic_info[DT_MIPS_GOTSYM_IDX];
+ local_gotno = tpnt->dynamic_info[DT_MIPS_LOCAL_GOTNO_IDX];
+
+ sym = ((ElfW(Sym) *) tpnt->dynamic_info[DT_SYMTAB]) + sym_index;
+ strtab = (char *) tpnt->dynamic_info[DT_STRTAB];
+ symname = strtab + sym->st_name;
+
+ new_addr = (unsigned long) _dl_find_hash(symname,
+ tpnt->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);
+ }
+
+ /* Address of jump instruction to fix up */
+ instr_addr = (unsigned long) (got + local_gotno + sym_index - gotsym);
+ got_addr = (char **) instr_addr;
+
+#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\n", *got_addr, new_addr, got_addr);
+ }
+ if (!_dl_debug_nofixups) {
+ *got_addr = (char*)new_addr;
+ }
+#else
+ *got_addr = (char*)new_addr;
+#endif
+
+ return new_addr;
+}
+
+unsigned long
+__dl_runtime_pltresolve(struct elf_resolve *tpnt, int reloc_entry)
+{
+ 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;
+ char *symname;
+
+ rel_addr = (char *)tpnt->dynamic_info[DT_JMPREL];
+ this_reloc = (ELF_RELOC *)(intptr_t)(rel_addr + reloc_entry);
+ symtab_index = ELF32_R_SYM(this_reloc->r_info);
+
+ symtab = (Elf32_Sym *)(intptr_t)tpnt->dynamic_info[DT_SYMTAB];
+ strtab = (char *)tpnt->dynamic_info[DT_STRTAB];
+ symname = strtab + symtab[symtab_index].st_name;
+
+ /* Address of the 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, tpnt->symbol_scope, tpnt, ELF_RTYPE_CLASS_PLT, NULL);
+ if (unlikely(!new_addr)) {
+ _dl_dprintf(2, "%s: can't resolve symbol '%s' in lib '%s'.\n", _dl_progname, symname, tpnt->libname);
+ _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,
+ "\n\tpatched: %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;
+}
+
+void _dl_parse_lazy_relocation_information(struct dyn_elf *rpnt,
+ unsigned long rel_addr, unsigned long rel_size)
+{
+ /* Nothing to do */
+ return;
+}
+
+int _dl_parse_relocation_information(struct dyn_elf *xpnt,
+ unsigned long rel_addr, unsigned long rel_size)
+{
+ ElfW(Sym) *symtab;
+ ELF_RELOC *rpnt;
+ char *strtab;
+ unsigned long i;
+ unsigned long *got;
+ unsigned long *reloc_addr=NULL;
+ unsigned long symbol_addr;
+ int reloc_type, symtab_index;
+ struct elf_resolve *tpnt = xpnt->dyn;
+ char *symname = NULL;
+#if defined (__SUPPORT_LD_DEBUG__)
+ unsigned long old_val=0;
+#endif
+
+ /* Now parse the relocation information */
+ rel_size = rel_size / sizeof(ElfW(Rel));
+ rpnt = (ELF_RELOC *) rel_addr;
+
+ symtab = (ElfW(Sym) *) tpnt->dynamic_info[DT_SYMTAB];
+ strtab = (char *) tpnt->dynamic_info[DT_STRTAB];
+ got = (unsigned long *) tpnt->dynamic_info[DT_PLTGOT];
+
+ for (i = 0; i < rel_size; i++, rpnt++) {
+ 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;
+
+ debug_sym(symtab,strtab,symtab_index);
+ debug_reloc(symtab,strtab,rpnt);
+ symname = strtab + symtab[symtab_index].st_name;
+#if defined (__SUPPORT_LD_DEBUG__)
+ if (reloc_addr)
+ old_val = *reloc_addr;
+#endif
+
+ if (reloc_type == R_MIPS_JUMP_SLOT || reloc_type == R_MIPS_COPY) {
+ symbol_addr = (unsigned long)_dl_find_hash(symname,
+ tpnt->symbol_scope,
+ tpnt,
+ elf_machine_type_class(reloc_type), NULL);
+ if (unlikely(!symbol_addr && ELF32_ST_BIND(symtab[symtab_index].st_info) != STB_WEAK))
+ return 1;
+ }
+ if (!symtab_index) {
+ /* Relocs against STN_UNDEF are usually treated as using a
+ * symbol value of zero, and using the module containing the
+ * reloc itself.
+ */
+ symbol_addr = symtab[symtab_index].st_value;
+ }
+
+ switch (reloc_type) {
+#if USE_TLS
+# if _MIPS_SIM == _MIPS_SIM_ABI64
+ case R_MIPS_TLS_DTPMOD64:
+ case R_MIPS_TLS_DTPREL64:
+ case R_MIPS_TLS_TPREL64:
+# else
+ case R_MIPS_TLS_DTPMOD32:
+ case R_MIPS_TLS_DTPREL32:
+ case R_MIPS_TLS_TPREL32:
+# endif
+ {
+ struct elf_resolve *tpnt_tls = NULL;
+
+ if (ELF32_ST_BIND(symtab[symtab_index].st_info) != STB_LOCAL) {
+ symbol_addr = (unsigned long) _dl_find_hash(symname, tpnt->symbol_scope,
+ tpnt, elf_machine_type_class(reloc_type), &tpnt_tls);
+ }
+ /* In case of a TLS reloc, tpnt_tls NULL means we have an 'anonymous'
+ symbol. This is the case for a static tls variable, so the lookup
+ module is just that one is referencing the tls variable. */
+ if (!tpnt_tls)
+ tpnt_tls = tpnt;
+
+ switch (reloc_type) {
+ case R_MIPS_TLS_DTPMOD64:
+ case R_MIPS_TLS_DTPMOD32:
+ if (tpnt_tls)
+ *(ElfW(Word) *)reloc_addr = tpnt_tls->l_tls_modid;
+#ifdef __SUPPORT_LD_DEBUG__
+ _dl_dprintf(2, "TLS_DTPMOD : %s, %d, %d\n",
+ symname, old_val, *((unsigned int *)reloc_addr));
+#endif
+ break;
+
+ case R_MIPS_TLS_DTPREL64:
+ case R_MIPS_TLS_DTPREL32:
+ *(ElfW(Word) *)reloc_addr +=
+ TLS_DTPREL_VALUE (symbol_addr);
+#ifdef __SUPPORT_LD_DEBUG__
+ _dl_dprintf(2, "TLS_DTPREL : %s, %x, %x\n",
+ symname, old_val, *((unsigned int *)reloc_addr));
+#endif
+ break;
+
+ case R_MIPS_TLS_TPREL32:
+ case R_MIPS_TLS_TPREL64:
+ CHECK_STATIC_TLS((struct link_map *)tpnt_tls);
+ *(ElfW(Word) *)reloc_addr +=
+ TLS_TPREL_VALUE (tpnt_tls, symbol_addr);
+#ifdef __SUPPORT_LD_DEBUG__
+ _dl_dprintf(2, "TLS_TPREL : %s, %x, %x\n",
+ symname, old_val, *((unsigned int *)reloc_addr));
+#endif
+ break;
+ }
+
+ break;
+ }
+#endif /* USE_TLS */
+#if _MIPS_SIM == _MIPS_SIM_ABI64
+ case (R_MIPS_64 << 8) | R_MIPS_REL32:
+#else /* O32 || N32 */
+ case R_MIPS_REL32:
+#endif /* O32 || N32 */
+ if (symtab_index) {
+ if (symtab_index < tpnt->dynamic_info[DT_MIPS_GOTSYM_IDX])
+ *reloc_addr +=
+ symtab[symtab_index].st_value +
+ (unsigned long) tpnt->loadaddr;
+ else {
+ *reloc_addr += got[symtab_index + tpnt->dynamic_info[DT_MIPS_LOCAL_GOTNO_IDX] -
+ tpnt->dynamic_info[DT_MIPS_GOTSYM_IDX]];
+ }
+ }
+ else {
+ *reloc_addr += (unsigned long) tpnt->loadaddr;
+ }
+ break;
+ case R_MIPS_JUMP_SLOT:
+ *reloc_addr = symbol_addr;
+ break;
+ case R_MIPS_COPY:
+ if (symbol_addr) {
+#if defined (__SUPPORT_LD_DEBUG__)
+ if (_dl_debug_move)
+ _dl_dprintf(_dl_debug_file,
+ "\n%s move %d bytes from %x to %x",
+ symname, symtab[symtab_index].st_size,
+ symbol_addr, reloc_addr);
+#endif
+
+ _dl_memcpy((char *)reloc_addr,
+ (char *)symbol_addr,
+ symtab[symtab_index].st_size);
+ }
+ break;
+ case R_MIPS_NONE:
+ break;
+ default:
+ {
+ _dl_dprintf(2, "\n%s: ",_dl_progname);
+
+ if (symtab_index)
+ _dl_dprintf(2, "symbol '%s': ", symname);
+
+#if defined (__SUPPORT_LD_DEBUG__)
+ _dl_dprintf(2, "can't handle reloc type '%s' in lib '%s'\n", _dl_reltypes(reloc_type), tpnt->libname);
+#else
+ _dl_dprintf(2, "can't handle reloc type %x in lib '%s'\n", reloc_type, tpnt->libname);
+#endif
+ _dl_exit(1);
+ }
+ }
+
+ }
+#if defined (__SUPPORT_LD_DEBUG__)
+ if (_dl_debug_reloc && _dl_debug_detail && reloc_addr)
+ _dl_dprintf(_dl_debug_file, "\tpatched: %x ==> %x @ %x\n", old_val, *reloc_addr, reloc_addr);
+#endif
+
+ return 0;
+}
+
+/* Relocate the global GOT entries for the object */
+void _dl_perform_mips_global_got_relocations(struct elf_resolve *tpnt, int lazy)
+{
+ ElfW(Sym) *sym;
+ char *strtab;
+ unsigned long i, tmp_lazy;
+ unsigned long *got_entry;
+
+ for (; tpnt ; tpnt = tpnt->next) {
+
+ /* We don't touch the dynamic linker */
+ if (tpnt->libtype == program_interpreter)
+ continue;
+
+ /* Setup the loop variables */
+ got_entry = (unsigned long *) (tpnt->dynamic_info[DT_PLTGOT])
+ + tpnt->dynamic_info[DT_MIPS_LOCAL_GOTNO_IDX];
+ sym = (ElfW(Sym) *) tpnt->dynamic_info[DT_SYMTAB] + tpnt->dynamic_info[DT_MIPS_GOTSYM_IDX];
+ strtab = (char *) tpnt->dynamic_info[DT_STRTAB];
+ i = tpnt->dynamic_info[DT_MIPS_SYMTABNO_IDX] - tpnt->dynamic_info[DT_MIPS_GOTSYM_IDX];
+
+#if defined (__SUPPORT_LD_DEBUG__)
+ if (_dl_debug_reloc)
+ _dl_dprintf(2, "_dl_perform_mips_global_got_relocations for '%s'\n", tpnt->libname);
+#endif
+ tmp_lazy = lazy && !tpnt->dynamic_info[DT_BIND_NOW];
+ /* Relocate the global GOT entries for the object */
+ while (i--) {
+ if (sym->st_shndx == SHN_UNDEF) {
+ if (ELF_ST_TYPE(sym->st_info) == STT_FUNC && sym->st_value && tmp_lazy) {
+ *got_entry = sym->st_value + (unsigned long) tpnt->loadaddr;
+ }
+ else {
+ *got_entry = (unsigned long) _dl_find_hash(strtab +
+ sym->st_name, tpnt->symbol_scope, tpnt, ELF_RTYPE_CLASS_PLT, NULL);
+ }
+ }
+ else if (sym->st_shndx == SHN_COMMON) {
+ *got_entry = (unsigned long) _dl_find_hash(strtab +
+ sym->st_name, tpnt->symbol_scope, tpnt, ELF_RTYPE_CLASS_PLT, NULL);
+ }
+ else if (ELF_ST_TYPE(sym->st_info) == STT_FUNC &&
+ *got_entry != sym->st_value && tmp_lazy) {
+ *got_entry += (unsigned long) tpnt->loadaddr;
+ }
+ else if (ELF_ST_TYPE(sym->st_info) == STT_SECTION) {
+ if (sym->st_other == 0)
+ *got_entry += (unsigned long) tpnt->loadaddr;
+ }
+ else {
+ *got_entry = (unsigned long) _dl_find_hash(strtab +
+ sym->st_name, tpnt->symbol_scope, tpnt, ELF_RTYPE_CLASS_PLT, NULL);
+ }
+
+ got_entry++;
+ sym++;
+ }
+ }
+}
+
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