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- /* vi: set sw=8 ts=8: */
- /*
- * ldso/ldso/sh64/elfinterp.c
- *
- * SuperH (sh64) ELF shared library loader suppport
- *
- * Copyright (C) 2003 Paul Mundt <lethal@linux-sh.org>
- *
- * 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.
- */
- #ifdef __SUPPORT_LD_DEBUG__
- static const char *_dl_reltypes_tab[] = {
- /* SHcompact relocs */
- [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", "R_SH_COUNT",
- [29] = "R_SH_ALIGN", "R_SH_CODE",
- "R_SH_DATA", "R_SH_LABEL",
- [33] = "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",
- /* SHmedia relocs */
- [45] = "R_SH_DIR5U", "R_SH_DIR6U",
- "R_SH_DIR6S", "R_SH_DIR10S",
- [49] = "R_SH_DIR10SW", "R_SH_DIR10SL",
- "R_SH_DIR10SQ",
- [169] = "R_SH_GOT_LOW16", "R_SH_GOT_MEDLOW16",
- "R_SH_GOT_MEDHI16", "R_SH_GOT_HI16",
- [173] = "R_SH_GOTPLT_LOW16", "R_SH_GOTPLT_MEDLOW16",
- "R_SH_GOTPLT_MEDHI16", "R_SH_GOTPLT_HI16",
- [177] = "R_SH_PLT_LOW16", "R_SH_PLT_MEDLOW16",
- "R_SH_PLT_MEDHI16", "R_SH_PLT_HI16",
- [181] = "R_SH_GOTOFF_LOW16", "R_SH_GOTOFF_MEDLOW16",
- "R_SH_GOTOFF_MEDHI16", "R_SH_GOTOFF_HI16",
- [185] = "R_SH_GOTPC_LOW16", "R_SH_GOTPC_MEDLOW16",
- "R_SH_GOTPC_MEDHI16", "R_SH_GOTPC_HI16",
- [189] = "R_SH_GOT10BY4", "R_SH_GOTPLT10BY4",
- "R_SH_GOT10BY8", "R_SH_GOTPLT10BY8",
- [193] = "R_SH_COPY64", "R_SH_GLOB_DAT64",
- "R_SH_JMP_SLOT64", "R_SH_RELATIVE64",
- [197] = "R_SH_RELATIVE_LOW16", "R_SH_RELATIVE_MEDLOW16",
- "R_SH_RELATIVE_MEDHI16","R_SH_RELATIVE_HI16",
- [242] = "R_SH_SHMEDIA_CODE", "R_SH_PT_16",
- "R_SH_IMMS16", "R_SH_IMMU16",
- [246] = "R_SH_IMM_LOW16", "R_SH_IMM_LOW16_PCREL",
- "R_SH_IMM_MEDLOW16", "R_SH_IMM_MEDLOW16_PCREL",
- [250] = "R_SH_IMM_MEDHI16", "R_SH_IMM_MEDHI16_PCREL",
- "R_SH_IMM_HI16", "R_SH_IMM_HI16_PCREL",
- [254] = "R_SH_64", "R_SH_64_PCREL",
- };
- static const char *_dl_reltypes(int type)
- {
- static char buf[22];
- const char *str;
- int tabsize;
- tabsize = sizeof(_dl_reltypes_tab)/sizeof(_dl_reltypes_tab[0]);
- str = _dl_reltypes_tab[type];
- if (type >= tabsize || str == NULL)
- 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 || !symtab_index)
- return;
- _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)
- return;
- if (_dl_debug_symbols) {
- _dl_dprintf(_dl_debug_file, "\n\t");
- } else {
- 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";
- _dl_dprintf(_dl_debug_file, "\n%s\n\t", sym);
- }
- _dl_dprintf(_dl_debug_file, "%s\toffset=%x",
- _dl_reltypes(ELF32_R_TYPE(rpnt->r_info)),
- rpnt->r_offset);
- #ifdef ELF_USES_RELOCA
- _dl_dprintf(_dl_debug_file, "\taddend=%x", rpnt->r_addend);
- #endif
- _dl_dprintf(_dl_debug_file, "\n");
- }
- #endif /* __SUPPORT_LD_DEBUG__ */
- /* 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;
- char *symname;
- rel_addr = (char *)(tpnt->dynamic_info[DT_JMPREL] + tpnt->loadaddr);
- this_reloc = (ELF_RELOC *)(intptr_t)(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 *)(intptr_t)
- (tpnt->dynamic_info[DT_SYMTAB] + tpnt->loadaddr);
- strtab = (char *)(tpnt->dynamic_info[DT_STRTAB] + tpnt->loadaddr);
- symname = strtab + symtab[symtab_index].st_name;
- if (reloc_type != R_SH_JMP_SLOT) {
- _dl_dprintf(2, "%s: Incorrect relocation type in jump reloc\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, tpnt->symbol_scope, ELF_RTYPE_CLASS_PLT);
- if (!new_addr) {
- _dl_dprintf(2, "%s: can't resolve symbol '%s'\n",
- _dl_progname, symname);
- _dl_exit(1);
- }
- #ifdef __SUPPORT_LD_DEBUG__
- if ((unsigned long)got_addr < 0x20000000) {
- 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 = 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))
- {
- unsigned int i;
- char *strtab;
- Elf32_Sym *symtab;
- ELF_RELOC *rpnt;
- int symtab_index;
- /* Now parse the relocation information */
- rpnt = (ELF_RELOC *)(intptr_t)(rel_addr + tpnt->loadaddr);
- rel_size = rel_size / sizeof(ELF_RELOC);
- symtab = (Elf32_Sym *)(intptr_t)
- (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;
- #ifdef __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);
- _dl_dprintf(2, "can't handle reloc type "
- #ifdef __SUPPORT_LD_DEBUG__
- "%s\n", _dl_reltypes(reloc_type)
- #else
- "%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, Elf32_Sym *symtab, char *strtab)
- {
- int reloc_type;
- int symtab_index, lsb;
- char *symname;
- unsigned long *reloc_addr;
- unsigned long symbol_addr;
- #ifdef __SUPPORT_LD_DEBUG__
- unsigned long old_val;
- #endif
- reloc_type = ELF32_R_TYPE(rpnt->r_info);
- symtab_index = ELF32_R_SYM(rpnt->r_info);
- symbol_addr = 0;
- lsb = symtab[symtab_index].st_other & 4;
- symname = strtab + symtab[symtab_index].st_name;
- reloc_addr = (unsigned long *)(intptr_t)
- (tpnt->loadaddr + (unsigned long)rpnt->r_offset);
- if (symtab_index) {
- int stb;
- symbol_addr = (unsigned long)_dl_find_hash(symname, scope,
- elf_machine_type_class(reloc_type));
- /*
- * 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.
- */
- stb = ELF32_ST_BIND(symtab[symtab_index].st_info);
- if (stb == STB_GLOBAL && !symbol_addr) {
- #ifdef __SUPPORT_LD_DEBUG__
- _dl_dprintf(2, "\tglobal symbol '%s' "
- "already defined in '%s'\n",
- symname, tpnt->libname);
- #endif
- return 0;
- }
- }
- #ifdef __SUPPORT_LD_DEBUG__
- 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:
- case R_SH_GLOB_DAT:
- case R_SH_JMP_SLOT:
- *reloc_addr = (symbol_addr + rpnt->r_addend) | lsb;
- break;
- case R_SH_REL32:
- *reloc_addr = symbol_addr + rpnt->r_addend -
- (unsigned long)reloc_addr;
- break;
- case R_SH_RELATIVE:
- *reloc_addr = (unsigned long)tpnt->loadaddr + rpnt->r_addend;
- break;
- case R_SH_RELATIVE_LOW16:
- case R_SH_RELATIVE_MEDLOW16:
- {
- unsigned long word, value;
- word = (unsigned long)reloc_addr & ~0x3fffc00;
- value = (unsigned long)tpnt->loadaddr + rpnt->r_addend;
- if (reloc_type == R_SH_RELATIVE_MEDLOW16)
- value >>= 16;
- word |= (value & 0xffff) << 10;
- *reloc_addr = word;
- break;
- }
- case R_SH_IMM_LOW16:
- case R_SH_IMM_MEDLOW16:
- {
- unsigned long word, value;
- word = (unsigned long)reloc_addr & ~0x3fffc00;
- value = (symbol_addr + rpnt->r_addend) | lsb;
- if (reloc_type == R_SH_IMM_MEDLOW16)
- value >>= 16;
- word |= (value & 0xffff) << 10;
- *reloc_addr = word;
- break;
- }
- case R_SH_IMM_LOW16_PCREL:
- case R_SH_IMM_MEDLOW16_PCREL:
- {
- unsigned long word, value;
- word = (unsigned long)reloc_addr & ~0x3fffc00;
- value = symbol_addr + rpnt->r_addend -
- (unsigned long)reloc_addr;
- if (reloc_type == R_SH_IMM_MEDLOW16_PCREL)
- value >>= 16;
- word |= (value & 0xffff) << 10;
- *reloc_addr = word;
- break;
- }
- default:
- return -1; /*call _dl_exit(1) */
- }
- #ifdef __SUPPORT_LD_DEBUG__
- if (_dl_debug_reloc && _dl_debug_detail)
- _dl_dprintf(_dl_debug_file, "\tpatched: %x ==> %x @ %x",
- old_val, *reloc_addr, reloc_addr);
- #endif
- return 0;
- }
- 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, symtab_index, lsb;
- unsigned long *reloc_addr;
- #ifdef __SUPPORT_LD_DEBUG__
- unsigned long old_val;
- #endif
- reloc_type = ELF32_R_TYPE(rpnt->r_info);
- symtab_index = ELF32_R_SYM(rpnt->r_info);
- lsb = symtab[symtab_index].st_other & 4;
- reloc_addr = (unsigned long *)(intptr_t)
- (tpnt->loadaddr + (unsigned long)rpnt->r_offset);
- #ifdef __SUPPORT_LD_DEBUG__
- old_val = *reloc_addr;
- #endif
- switch (reloc_type) {
- case R_SH_NONE:
- break;
- case R_SH_JMP_SLOT:
- *reloc_addr += (unsigned long)tpnt->loadaddr | lsb;
- break;
- default:
- return -1; /*call _dl_exit(1) */
- }
- #ifdef __SUPPORT_LD_DEBUG__
- if (_dl_debug_reloc && _dl_debug_detail)
- _dl_dprintf(_dl_debug_file, "\tpatched: %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_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;
- char *symname;
- int goof = 0;
- reloc_addr = (unsigned long *)(intptr_t)
- (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;
- symname = strtab + symtab[symtab_index].st_name;
- if (symtab_index) {
- symbol_addr = (unsigned long)
- _dl_find_hash(symname, scope, ELF_RTYPE_CLASS_COPY);
- if (!symbol_addr)
- goof++;
- }
- if (!goof) {
- #ifdef __SUPPORT_LD_DEBUG__
- if (_dl_debug_move)
- _dl_dprintf(_dl_debug_file,
- "\n%s move %x bytes from %x to %x",
- symname, 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 dyn_elf *rpnt,
- unsigned long rel_addr, unsigned long rel_size, int type)
- {
- (void)_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, int type)
- {
- return _dl_parse(rpnt->dyn, rpnt->dyn->symbol_scope, rel_addr, rel_size, _dl_do_reloc);
- }
- int _dl_parse_copy_information(struct dyn_elf *rpnt,
- unsigned long rel_addr, unsigned long rel_size, int type)
- {
- return _dl_parse(rpnt->dyn, rpnt->next, rel_addr, rel_size, _dl_do_copy_reloc);
- }
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