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- /* vi: set sw=4 ts=4: */
- /* i386 ELF shared library loader suppport
- *
- * Copyright (C) 2001-2002, David A. Schleef
- *
- * 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.
- */
- #ifndef VERBOSE_DLINKER
- #define VERBOSE_DLINKER
- #endif
- #ifdef VERBOSE_DLINKER
- static const char *_dl_reltypes[] =
- { "R_PPC_NONE", "R_PPC_ADDR32", "R_PPC_ADDR24", "R_PPC_ADDR16",
- "R_PPC_ADDR16_LO", "R_PPC_ADDR16_HI", "R_PPC_ADDR16_HA",
- "R_PPC_ADDR14", "R_PPC_ADDR14_BRTAKEN", "R_PPC_ADDR14_BRNTAKEN",
- "R_PPC_REL24", "R_PPC_REL14", "R_PPC_REL14_BRTAKEN",
- "R_PPC_REL14_BRNTAKEN", "R_PPC_GOT16", "R_PPC_GOT16_LO",
- "R_PPC_GOT16_HI", "R_PPC_GOT16_HA", "R_PPC_PLTREL24",
- "R_PPC_COPY", "R_PPC_GLOB_DAT", "R_PPC_JMP_SLOT", "R_PPC_RELATIVE",
- "R_PPC_LOCAL24PC", "R_PPC_UADDR32", "R_PPC_UADDR16", "R_PPC_REL32",
- "R_PPC_PLT32", "R_PPC_PLTREL32", "R_PPC_PLT16_LO", "R_PPC_PLT16_HI",
- "R_PPC_PLT16_HA", "R_PPC_SDAREL16", "R_PPC_SECTOFF",
- "R_PPC_SECTOFF_LO", "R_PPC_SECTOFF_HI", "R_PPC_SECTOFF_HA",
- };
- #define N_RELTYPES (sizeof(_dl_reltypes)/sizeof(_dl_reltypes[0]))
- #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. */
- #ifdef LD_DEBUG_SYMBOLS
- static void debug_sym(Elf32_Sym *symtab,char *strtab,int symtab_index);
- static void debug_reloc(ELF_RELOC *rpnt);
- #define DPRINTF(fmt,args...) _dl_dprintf(2,fmt,args)
- #else
- #define debug_sym(a,b,c)
- #define debug_reloc(a)
- #define DPRINTF(fmt,args...)
- #endif
- extern int _dl_linux_resolve(void);
- void _dl_init_got(unsigned long *plt,struct elf_resolve *tpnt)
- {
- unsigned long target_addr = (unsigned long)_dl_linux_resolve;
- unsigned int n_plt_entries;
- unsigned long *tramp;
- unsigned long data_words;
- unsigned int rel_offset_words;
- DPRINTF("init_got plt=%x, tpnt=%x\n",
- (unsigned long)plt,(unsigned long)tpnt);
- n_plt_entries = tpnt->dynamic_info[DT_PLTRELSZ] / sizeof(ELF_RELOC);
- DPRINTF("n_plt_entries %d\n",n_plt_entries);
- rel_offset_words = PLT_DATA_START_WORDS(n_plt_entries);
- DPRINTF("rel_offset_words %x\n",rel_offset_words);
- data_words = (unsigned long)(plt + rel_offset_words);
- DPRINTF("data_words %x\n",data_words);
- tpnt->data_words = data_words;
- plt[PLT_LONGBRANCH_ENTRY_WORDS] = OPCODE_ADDIS_HI(11, 11, data_words);
- plt[PLT_LONGBRANCH_ENTRY_WORDS+1] = OPCODE_LWZ(11,data_words,11);
- plt[PLT_LONGBRANCH_ENTRY_WORDS+2] = OPCODE_MTCTR(11);
- plt[PLT_LONGBRANCH_ENTRY_WORDS+3] = OPCODE_BCTR();
- /* [4] */
- /* [5] */
- tramp = plt + PLT_TRAMPOLINE_ENTRY_WORDS;
- tramp[0] = OPCODE_ADDIS_HI(11,11,-data_words);
- tramp[1] = OPCODE_ADDI(11,11,-data_words);
- tramp[2] = OPCODE_SLWI(12,11,1);
- tramp[3] = OPCODE_ADD(11,12,11);
- tramp[4] = OPCODE_LI(12,target_addr);
- tramp[5] = OPCODE_ADDIS_HI(12,12,target_addr);
- tramp[6] = OPCODE_MTCTR(12);
- tramp[7] = OPCODE_LI(12,(unsigned long)tpnt);
- tramp[8] = OPCODE_ADDIS_HI(12,12,(unsigned long)tpnt);
- tramp[9] = OPCODE_BCTR();
- /* [16] unused */
- /* [17] unused */
- /* instructions were modified */
- PPC_DCBST(plt);
- PPC_DCBST(plt+4);
- PPC_DCBST(plt+8);
- PPC_SYNC;
- PPC_ICBI(plt);
- PPC_ICBI(plt+4);
- PPC_ICBI(plt+8);
- PPC_ISYNC;
- }
- unsigned long _dl_linux_resolver(struct elf_resolve *tpnt, int reloc_entry)
- {
- int reloc_type;
- ELF_RELOC *this_reloc;
- char *strtab;
- Elf32_Sym *symtab;
- ELF_RELOC *rel_addr;
- int symtab_index;
- unsigned long insn_addr;
- unsigned long *insns;
- unsigned long targ_addr;
- int delta;
- //DPRINTF("linux_resolver tpnt=%x reloc_entry=%x\n", tpnt, reloc_entry);
- rel_addr = (ELF_RELOC *) (tpnt->dynamic_info[DT_JMPREL] + tpnt->loadaddr);
- this_reloc = (void *)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);
- //debug_reloc(this_reloc);
- if (reloc_type != R_PPC_JMP_SLOT) {
- _dl_dprintf(2, "%s: Incorrect relocation type [%s] in jump relocations\n",
- _dl_progname,
- (reloc_type<N_RELTYPES)?_dl_reltypes[reloc_type]:"unknown");
- _dl_exit(1);
- };
- /* Address of dump instruction to fix up */
- insn_addr = (unsigned long) tpnt->loadaddr +
- (unsigned long) this_reloc->r_offset;
- DPRINTF("Resolving symbol %s %x --> ",
- strtab + symtab[symtab_index].st_name,
- insn_addr);
- /* Get the address of the GOT entry */
- targ_addr = (unsigned long) _dl_find_hash(
- strtab + symtab[symtab_index].st_name,
- tpnt->symbol_scope, tpnt, resolver);
- if (!targ_addr) {
- _dl_dprintf(2, "%s: can't resolve symbol '%s'\n",
- _dl_progname, strtab + symtab[symtab_index].st_name);
- _dl_exit(1);
- };
- DPRINTF("%x\n", targ_addr);
- insns = (unsigned long *)insn_addr;
- delta = targ_addr - insn_addr;
- if(delta<<6>>6 == delta){
- insns[0] = OPCODE_B(delta);
- }else if (targ_addr <= 0x01fffffc || targ_addr >= 0xfe000000){
- insns[0] = OPCODE_BA (targ_addr);
- }else{
- /* Warning: we don't handle double-sized PLT entries */
- unsigned long plt_addr;
- unsigned long lbranch_addr;
- unsigned long *ptr;
- int index;
- plt_addr = (unsigned long)tpnt->dynamic_info[DT_PLTGOT] +
- (unsigned long)tpnt->loadaddr;
- lbranch_addr = plt_addr + PLT_LONGBRANCH_ENTRY_WORDS*4;
- delta = lbranch_addr - insn_addr;
- index = (insn_addr - plt_addr - PLT_INITIAL_ENTRY_WORDS*4)/8;
- ptr = (unsigned long *)tpnt->data_words;
- DPRINTF("plt_addr=%x delta=%x index=%x ptr=%x\n",
- plt_addr, delta, index, ptr);
- ptr[index] = targ_addr;
- /* icache sync is not necessary, since this will be a data load */
- //PPC_DCBST(ptr+index);
- //PPC_SYNC;
- //PPC_ICBI(ptr+index);
- //PPC_ISYNC;
- insns[1] = OPCODE_B(delta - 4);
- }
- /* instructions were modified */
- PPC_DCBST(insn_addr);
- PPC_SYNC;
- PPC_ICBI(insn_addr);
- PPC_ISYNC;
- return targ_addr;
- }
- void _dl_parse_lazy_relocation_information(struct elf_resolve *tpnt,
- unsigned long rel_addr, unsigned long rel_size, int type)
- {
- int i;
- char *strtab;
- int reloc_type;
- int symtab_index;
- Elf32_Sym *symtab;
- ELF_RELOC *rpnt;
- unsigned long reloc_addr;
- unsigned long *insns;
- unsigned long *plt;
- int index;
- DPRINTF("_dl_parse_lazy_relocation_information(tpnt=%x, rel_addr=%x, rel_size=%x, type=%d)\n",
- tpnt,rel_addr,rel_size,type);
- /* 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);
- plt = (unsigned long *)(tpnt->dynamic_info[DT_PLTGOT] + tpnt->loadaddr);
- 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);
- /* 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;
- DPRINTF("L %x %s %s %x %x\n",
- reloc_addr, _dl_reltypes[reloc_type],
- symtab_index?strtab + symtab[symtab_index].st_name:"",0,0);
- switch (reloc_type) {
- case R_PPC_NONE:
- break;
- case R_PPC_JMP_SLOT:
- {
- int delta;
-
- delta = (unsigned long)(plt+PLT_TRAMPOLINE_ENTRY_WORDS+2)
- - (reloc_addr+4);
- index = (reloc_addr -
- (unsigned long)(plt+PLT_INITIAL_ENTRY_WORDS))
- /sizeof(unsigned long);
- index /= 2;
- DPRINTF(" index %x delta %x\n",index,delta);
- insns = (unsigned long *)reloc_addr;
- insns[0] = OPCODE_LI(11,index*4);
- insns[1] = OPCODE_B(delta);
- break;
- }
- default:
- _dl_dprintf(2, "%s: (LAZY) can't handle reloc type ",
- _dl_progname);
- #ifdef VERBOSE_DLINKER
- _dl_dprintf(2, "%s ", _dl_reltypes[reloc_type]);
- #endif
- if (symtab_index)
- _dl_dprintf(2, "'%s'\n", strtab + symtab[symtab_index].st_name);
- _dl_exit(1);
- };
- /* instructions were modified */
- PPC_DCBST(reloc_addr);
- PPC_SYNC;
- PPC_ICBI(reloc_addr);
- };
- }
- int _dl_parse_relocation_information(struct elf_resolve *tpnt,
- unsigned long rel_addr, unsigned long rel_size, int type)
- {
- int i;
- char *strtab;
- int reloc_type;
- int goof = 0;
- Elf32_Sym *symtab;
- ELF_RELOC *rpnt;
- unsigned long *reloc_addr;
- unsigned long symbol_addr;
- int symtab_index;
- unsigned long addend;
- unsigned long *plt;
- DPRINTF("_dl_parse_relocation_information(tpnt=%x, rel_addr=%x, rel_size=%x, type=%d)\n",
- tpnt,rel_addr,rel_size,type);
- /* 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);
- plt = (unsigned long *)(tpnt->dynamic_info[DT_PLTGOT] + tpnt->loadaddr);
- for (i = 0; i < rel_size; i++, rpnt++) {
- debug_reloc(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);
- addend = rpnt->r_addend;
- 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 = (unsigned long) _dl_find_hash(strtab + symtab[symtab_index].st_name,
- tpnt->symbol_scope,
- (reloc_type == R_PPC_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) {
- _dl_dprintf(2, "%s: can't resolve symbol '%s'\n",
- _dl_progname, strtab + symtab[symtab_index].st_name);
- goof++;
- }
- }
- debug_sym(symtab,strtab,symtab_index);
- switch (reloc_type) {
- case R_PPC_NONE:
- break;
- case R_PPC_REL24:
- #if 0
- {
- int delta = symbol_addr - (unsigned long)reloc_addr;
- if(delta<<6>>6 != delta){
- _dl_dprintf(2,"R_PPC_REL24: Reloc out of range\n");
- _dl_exit(1);
- }
- *reloc_addr &= 0xfc000003;
- *reloc_addr |= delta&0x03fffffc;
- }
- break;
- #else
- _dl_dprintf(2,"R_PPC_REL24: Compile shared libraries with -fPIC!\n");
- _dl_exit(1);
- #endif
- case R_PPC_RELATIVE:
- *reloc_addr = (unsigned long)tpnt->loadaddr + addend;
- break;
- case R_PPC_ADDR32:
- *reloc_addr += symbol_addr;
- break;
- case R_PPC_ADDR16_HA:
- /* XXX is this correct? */
- *(short *)reloc_addr += (symbol_addr+0x8000)>>16;
- break;
- case R_PPC_ADDR16_HI:
- *(short *)reloc_addr += symbol_addr>>16;
- break;
- case R_PPC_ADDR16_LO:
- *(short *)reloc_addr += symbol_addr;
- break;
- case R_PPC_JMP_SLOT:
- {
- unsigned long targ_addr = (unsigned long)_dl_linux_resolve;
- int delta = targ_addr - (unsigned long)reloc_addr;
- if(delta<<6>>6 == delta){
- *reloc_addr = OPCODE_B(delta);
- }else if (targ_addr <= 0x01fffffc || targ_addr >= 0xfe000000){
- *reloc_addr = OPCODE_BA (targ_addr);
- }else{
- {
- int delta;
- int index;
-
- delta = (unsigned long)(plt+PLT_TRAMPOLINE_ENTRY_WORDS+2)
- - (unsigned long)(reloc_addr+1);
- index = ((unsigned long)reloc_addr -
- (unsigned long)(plt+PLT_INITIAL_ENTRY_WORDS))
- /sizeof(unsigned long);
- index /= 2;
- DPRINTF(" index %x delta %x\n",index,delta);
- reloc_addr[0] = OPCODE_LI(11,index*4);
- reloc_addr[1] = OPCODE_B(delta);
- }
- }
- break;
- }
- case R_PPC_GLOB_DAT:
- *reloc_addr += symbol_addr;
- break;
- case R_PPC_COPY:
- // handled later
- break;
- default:
- _dl_dprintf(2, "%s: can't handle reloc type ", _dl_progname);
- #ifdef VERBOSE_DLINKER
- _dl_dprintf(2, "%s ", _dl_reltypes[reloc_type]);
- #endif
- if (symtab_index)
- _dl_dprintf(2, "'%s'\n", strtab + symtab[symtab_index].st_name);
- _dl_exit(1);
- };
- /* instructions were modified */
- PPC_DCBST(reloc_addr);
- PPC_SYNC;
- PPC_ICBI(reloc_addr);
- DPRINTF("reloc_addr %x: %x\n",reloc_addr,*reloc_addr);
- };
- return goof;
- }
- /* 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 */
- int _dl_parse_copy_information(struct dyn_elf *xpnt, unsigned long rel_addr,
- unsigned long rel_size, int type)
- {
- int i;
- char *strtab;
- int reloc_type;
- int goof = 0;
- Elf32_Sym *symtab;
- ELF_RELOC *rpnt;
- unsigned long *reloc_addr;
- unsigned long symbol_addr;
- struct elf_resolve *tpnt;
- int symtab_index;
- DPRINTF("parse_copy xpnt=%x rel_addr=%x rel_size=%x type=%d\n",
- (int)xpnt,rel_addr,rel_size,type);
- /* Now parse the relocation information */
- 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 = (unsigned long *) (tpnt->loadaddr + (unsigned long) rpnt->r_offset);
- reloc_type = ELF32_R_TYPE(rpnt->r_info);
- if (reloc_type != R_PPC_COPY)
- continue;
- debug_reloc(rpnt);
- 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 = (unsigned long) _dl_find_hash(strtab +
- symtab[symtab_index].st_name, xpnt->next,
- NULL, copyrel);
- if (!symbol_addr) {
- _dl_dprintf(2, "%s: can't resolve symbol '%s'\n",
- _dl_progname, strtab + symtab[symtab_index].st_name);
- goof++;
- };
- };
- debug_sym(symtab,strtab,symtab_index);
- DPRINTF("copy: to=%x from=%x size=%x\n",
- symtab[symtab_index].st_value,
- symbol_addr, symtab[symtab_index].st_size);
- if (!goof) {
- _dl_memcpy((char *) symtab[symtab_index].st_value,
- (char *) symbol_addr,
- symtab[symtab_index].st_size);
- }
- };
- return goof;
- }
- #ifdef unused
- static void fixup_jmpslot(unsigned long reloc_addr, unsigned long targ_addr)
- {
- int delta = targ_addr - reloc_addr;
- int index;
-
- if(delta<<6>>6 == delta){
- *reloc_addr = OPCODE_B(delta);
- }else if (targ_addr <= 0x01fffffc || targ_addr >= 0xfe000000){
- *reloc_addr = OPCODE_BA (targ_addr);
- }else{
- delta = (unsigned long)(plt+PLT_TRAMPOLINE_ENTRY_WORDS+2)
- - (unsigned long)(reloc_addr+1);
- index = ((unsigned long)reloc_addr -
- (unsigned long)(plt+PLT_INITIAL_ENTRY_WORDS))
- /sizeof(unsigned long);
- index /= 2;
- DPRINTF(" index %x delta %x\n",index,delta);
- reloc_addr[0] = OPCODE_LI(11,index*4);
- reloc_addr[1] = OPCODE_B(delta);
- }
- }
- #endif
- #ifdef LD_DEBUG_SYMBOLS
- static void debug_sym(Elf32_Sym *symtab,char *strtab,int symtab_index)
- {
- if(symtab_index){
- _dl_dprintf(2, "sym: name=%s value=%x size=%x info=%x other=%x shndx=%x\n",
- 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);
- }else{
- _dl_dprintf(2, "sym: null\n");
- }
- }
- static void debug_reloc(ELF_RELOC *rpnt)
- {
- _dl_dprintf(2, "reloc: offset=%x type=%x sym=%x addend=%x\n",
- rpnt->r_offset,
- ELF32_R_TYPE(rpnt->r_info),
- ELF32_R_SYM(rpnt->r_info),
- rpnt->r_addend);
- }
- #endif
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