/* vi: set sw=4 ts=4: */
-/* i386 ELF shared library loader suppport
+/* powerpc shared library loader suppport
*
- * Copyright (C) 2001-2002, David A. Schleef
+ * Copyright (C) 2001-2002 David A. Schleef
+ * Copyright (C) 2003-2004 Erik Andersen
+ * Copyright (C) 2004 Joakim Tjernlund
*
* All rights reserved.
*
* SUCH DAMAGE.
*/
-/* FIXME -- Disable this when __SUPPORT_LD_DEBUG__ is undefined */
-#if defined (__SUPPORT_LD_DEBUG__)
-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 __SUPPORT_LD_DEBUG__
-static void debug_sym(Elf32_Sym *symtab,char *strtab,int symtab_index);
-static void debug_reloc(ELF_RELOC *rpnt);
-#define DPRINTF(fmt,args...) if (_dl_debug) _dl_dprintf(2,fmt,args)
-#else
-#define debug_sym(a,b,c)
-#define debug_reloc(a)
-#define DPRINTF(fmt,args...)
-#endif
+#include "ldso.h"
+#define TLS_DTV_OFFSET 0x8000
+#define TLS_TP_OFFSET 0x7000
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);
-
+ Elf32_Word *tramp;
+ Elf32_Word num_plt_entries;
+ Elf32_Word data_words;
+ Elf32_Word rel_offset_words;
+ Elf32_Word dlrr = (Elf32_Word) _dl_linux_resolve;
+
+ if (tpnt->dynamic_info[DT_JMPREL] == 0)
+ return;
+ if (tpnt->dynamic_info[DT_PPC_GOT_IDX] != 0) {
+ tpnt->dynamic_info[DT_PPC_GOT_IDX] += tpnt->loadaddr;
+ return;
+ }
+ num_plt_entries = tpnt->dynamic_info[DT_PLTRELSZ] / sizeof(ELF_RELOC);
+ rel_offset_words = PLT_DATA_START_WORDS(num_plt_entries);
+ data_words = (Elf32_Word) (plt + rel_offset_words);
tpnt->data_words = data_words;
plt[PLT_LONGBRANCH_ENTRY_WORDS] = OPCODE_ADDIS_HI(11, 11, data_words);
/* [4] */
/* [5] */
+ tramp = (Elf32_Word *) (plt + PLT_TRAMPOLINE_ENTRY_WORDS);
- tramp = plt + PLT_TRAMPOLINE_ENTRY_WORDS;
+ /* For the long entries, subtract off data_words. */
tramp[0] = OPCODE_ADDIS_HI(11,11,-data_words);
tramp[1] = OPCODE_ADDI(11,11,-data_words);
+
+ /* Multiply index of entry by 3 (in r11). */
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();
-
+ if (dlrr <= 0x01fffffc || dlrr >= 0xfe000000) {
+ /* Load address of link map in r12. */
+ tramp[4] = OPCODE_LI (12, (Elf32_Word) tpnt);
+ tramp[5] = OPCODE_ADDIS_HI (12, 12, (Elf32_Word) tpnt);
+
+ /* Call _dl_linux_resolve . */
+ tramp[6] = OPCODE_BA (dlrr);
+ } else {
+ /* Get address of _dl_linux_resolve in CTR. */
+ tramp[4] = OPCODE_LI(12,dlrr);
+ tramp[5] = OPCODE_ADDIS_HI(12,12,dlrr);
+ tramp[6] = OPCODE_MTCTR(12);
+
+ /* Load address of link map in r12. */
+ tramp[7] = OPCODE_LI(12,(Elf32_Word) tpnt);
+ tramp[8] = OPCODE_ADDIS_HI(12,12,(Elf32_Word) tpnt);
+
+ /* Call _dl_linux_resolve. */
+ tramp[9] = OPCODE_BCTR();
+ }
/* [16] unused */
/* [17] unused */
- /* instructions were modified */
PPC_DCBST(plt);
PPC_DCBST(plt+4);
PPC_DCBST(plt+8);
+ PPC_DCBST(plt+12);
+ PPC_DCBST(plt+16-1);
PPC_SYNC;
PPC_ICBI(plt);
- PPC_ICBI(plt+4);
- PPC_ICBI(plt+8);
+ PPC_ICBI(plt+16-1);
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;
+ char *symname;
+ Elf32_Addr *reloc_addr;
+ Elf32_Addr finaladdr;
+ Elf32_Sword delta;
- //DPRINTF("linux_resolver tpnt=%x reloc_entry=%x\n", tpnt, reloc_entry);
-
- rel_addr = (ELF_RELOC *) (tpnt->dynamic_info[DT_JMPREL] + tpnt->loadaddr);
+ rel_addr = (ELF_RELOC *)tpnt->dynamic_info[DT_JMPREL];
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);
+ symtab = (Elf32_Sym *)tpnt->dynamic_info[DT_SYMTAB];
+ strtab = (char *)tpnt->dynamic_info[DT_STRTAB];
+ symname = strtab + symtab[symtab_index].st_name;
- //debug_reloc(this_reloc);
-
- if (reloc_type != R_PPC_JMP_SLOT) {
-#if defined (__SUPPORT_LD_DEBUG__)
- _dl_dprintf(2, "%s: Incorrect relocation type [%s] in jump relocation\n",
- _dl_progname,
- (reloc_type<N_RELTYPES)?_dl_reltypes[reloc_type]:"unknown");
-#else
- _dl_dprintf(2, "%s: Incorrect relocation type in jump relocation\n", _dl_progname);
-#endif
- _dl_exit(1);
- };
+ debug_sym(symtab,strtab,symtab_index);
+ debug_reloc(symtab,strtab,this_reloc);
/* Address of dump instruction to fix up */
- insn_addr = (unsigned long) tpnt->loadaddr +
- (unsigned long) this_reloc->r_offset;
+ reloc_addr = (Elf32_Addr *) (tpnt->loadaddr + this_reloc->r_offset);
- DPRINTF("Resolving symbol %s %x --> ",
- strtab + symtab[symtab_index].st_name,
- insn_addr);
+#if defined (__SUPPORT_LD_DEBUG__)
+ if (_dl_debug_reloc && _dl_debug_detail)
+ _dl_dprintf(_dl_debug_file, "\n\tResolving symbol %s %x --> ", symname, (Elf32_Addr)reloc_addr);
+#endif
/* 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);
+ finaladdr = (Elf32_Addr) _dl_find_hash(symname,
+ tpnt->symbol_scope, tpnt, ELF_RTYPE_CLASS_PLT, NULL);
+ if (unlikely(!finaladdr)) {
+ _dl_dprintf(2, "%s: can't resolve symbol '%s' in lib '%s'.\n", _dl_progname, symname, tpnt->libname);
_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);
+ finaladdr += this_reloc->r_addend;
#if defined (__SUPPORT_LD_DEBUG__)
- _dl_dprintf(2, "%s ", _dl_reltypes[reloc_type]);
+ if (_dl_debug_reloc && _dl_debug_detail)
+ _dl_dprintf(_dl_debug_file, "%x\n", finaladdr);
#endif
- if (symtab_index)
- _dl_dprintf(2, "'%s'\n", strtab + symtab[symtab_index].st_name);
- _dl_exit(1);
- };
+ if (tpnt->dynamic_info[DT_PPC_GOT_IDX] != 0) {
+ *reloc_addr = finaladdr;
+ } else {
+ delta = finaladdr - (Elf32_Word)reloc_addr;
+ if (delta<<6>>6 == delta) {
+ *reloc_addr = OPCODE_B(delta);
+ } else if (finaladdr <= 0x01fffffc) {
+ *reloc_addr = OPCODE_BA (finaladdr);
+ } else {
+ /* Warning: we don't handle double-sized PLT entries */
+ Elf32_Word *plt, *data_words, idx, offset;
+
+ plt = (Elf32_Word *)tpnt->dynamic_info[DT_PLTGOT];
+ offset = reloc_addr - plt;
+ idx = (offset - PLT_INITIAL_ENTRY_WORDS)/2;
+ data_words = (Elf32_Word *)tpnt->data_words;
+ reloc_addr += 1;
+
+ data_words[idx] = finaladdr;
+ PPC_SYNC;
+ *reloc_addr = OPCODE_B ((PLT_LONGBRANCH_ENTRY_WORDS - (offset+1)) * 4);
+ }
/* instructions were modified */
PPC_DCBST(reloc_addr);
PPC_SYNC;
PPC_ICBI(reloc_addr);
- };
+ PPC_ISYNC;
+ }
+ return finaladdr;
}
-int _dl_parse_relocation_information(struct elf_resolve *tpnt,
- unsigned long rel_addr, unsigned long rel_size, int type)
+static __inline__ int
+_dl_do_reloc (struct elf_resolve *tpnt,struct dyn_elf *scope,
+ ELF_RELOC *rpnt, Elf32_Sym *symtab, char *strtab)
{
- 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);
+ ElfW(Sym) *sym;
+ Elf32_Addr *reloc_addr;
+ Elf32_Addr finaladdr;
+ struct elf_resolve *tls_tpnt = NULL;
+ unsigned long symbol_addr;
+ char *symname;
+#if defined (__SUPPORT_LD_DEBUG__)
+ unsigned long old_val;
+#endif
- 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++;
+ symbol_addr = tpnt->loadaddr; /* For R_PPC_RELATIVE */
+ reloc_addr = (Elf32_Addr *)(intptr_t) (symbol_addr + (unsigned long) rpnt->r_offset);
+ reloc_type = ELF32_R_TYPE(rpnt->r_info);
+ symtab_index = ELF32_R_SYM(rpnt->r_info);
+ sym = &symtab[symtab_index];
+ symname = strtab + sym->st_name;
+ if (symtab_index) {
+ symbol_addr = (unsigned long) _dl_find_hash(symname, scope, tpnt,
+ elf_machine_type_class(reloc_type), &tls_tpnt);
+ /* 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 (unlikely(!symbol_addr
+ && (ELF32_ST_TYPE(sym->st_info) != STT_TLS
+ && ELF32_ST_BIND(sym->st_info) != STB_WEAK)))
+ return 1;
+ } else {
+ symbol_addr = sym->st_value;
+ tls_tpnt = tpnt;
+ }
+#if defined (__SUPPORT_LD_DEBUG__)
+ old_val = *reloc_addr;
+#endif
+ finaladdr = (Elf32_Addr) (symbol_addr + rpnt->r_addend);
+
+ switch (reloc_type) {
+ case R_PPC_RELATIVE:
+ case R_PPC_ADDR32:
+ case R_PPC_GLOB_DAT:
+ *reloc_addr = finaladdr;
+ goto out_nocode; /* No code code modified */
+ case R_PPC_JMP_SLOT:
+ {
+ if (tpnt->dynamic_info[DT_PPC_GOT_IDX] != 0) {
+ *reloc_addr = finaladdr;
+ goto out_nocode; /* No code code modified */
+ } else {
+ Elf32_Sword delta = finaladdr - (Elf32_Word)reloc_addr;
+ if (delta<<6>>6 == delta) {
+ *reloc_addr = OPCODE_B(delta);
+ } else if (finaladdr <= 0x01fffffc) {
+ *reloc_addr = OPCODE_BA (finaladdr);
+ } else {
+ /* Warning: we don't handle double-sized PLT entries */
+ Elf32_Word *plt, *data_words, idx, offset;
+
+ plt = (Elf32_Word *)tpnt->dynamic_info[DT_PLTGOT];
+ offset = reloc_addr - plt;
+ idx = (offset - PLT_INITIAL_ENTRY_WORDS)/2;
+ data_words = (Elf32_Word *)tpnt->data_words;
+
+ data_words[idx] = finaladdr;
+ reloc_addr[0] = OPCODE_LI(11,idx*4);
+ reloc_addr[1] = OPCODE_B((PLT_LONGBRANCH_ENTRY_WORDS - (offset+1)) * 4);
+
+ /* instructions were modified */
+ PPC_DCBST(reloc_addr+1);
+ PPC_SYNC;
+ PPC_ICBI(reloc_addr+1);
}
}
- debug_sym(symtab,strtab,symtab_index);
-
- switch (reloc_type) {
- case R_PPC_NONE:
- break;
- case R_PPC_REL24:
+ break;
+ }
+ case R_PPC_COPY:
+#if defined (__SUPPORT_LD_DEBUG__)
+ if (_dl_debug_move)
+ _dl_dprintf(_dl_debug_file,"\n%s move %x bytes from %x to %x",
+ symname, sym->st_size,
+ symbol_addr, reloc_addr);
+#endif
+ _dl_memcpy((char *) reloc_addr, (char *) finaladdr, sym->st_size);
+ goto out_nocode; /* No code code modified */
+ case R_PPC_ADDR16_HA:
+ finaladdr += 0x8000; /* fall through. */
+ case R_PPC_ADDR16_HI:
+ finaladdr >>= 16; /* fall through. */
+ case R_PPC_ADDR16_LO:
+ *(short *)reloc_addr = finaladdr;
+ break;
+#if USE_TLS
+ case R_PPC_DTPMOD32:
+ *reloc_addr = tls_tpnt->l_tls_modid;
+ break;
+ case R_PPC_DTPREL32:
+ /* During relocation all TLS symbols are defined and used.
+ Therefore the offset is already correct. */
+ *reloc_addr = finaladdr - TLS_DTV_OFFSET;
+ break;
+ case R_PPC_TPREL32:
+ *reloc_addr = tls_tpnt->l_tls_offset + finaladdr - TLS_TP_OFFSET;
+ break;
+#endif
+ 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");
+ {
+ Elf32_Sword delta = finaladdr - (Elf32_Word)reloc_addr;
+ if (unlikely(delta<<6>>6 != delta)) {
+ _dl_dprintf(2, "%s: symbol '%s' R_PPC_REL24 is out of range.\n\t"
+ "Compile shared libraries with -fPIC!\n",
+ _dl_progname, symname);
_dl_exit(1);
}
- *reloc_addr &= 0xfc000003;
- *reloc_addr |= delta&0x03fffffc;
- }
+ *reloc_addr = (*reloc_addr & 0xfc000003) | (delta & 0x3fffffc);
break;
+ }
#else
- _dl_dprintf(2,"R_PPC_REL24: Compile shared libraries with -fPIC!\n");
- _dl_exit(1);
+ _dl_dprintf(2,"R_PPC_REL24: Compile shared libraries with -fPIC!\n");
+ return -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)*reloc_addr;
- 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);
+ case R_PPC_NONE:
+ goto out_nocode; /* No code code modified */
+ default:
+ _dl_dprintf(2, "%s: can't handle reloc type ", _dl_progname);
#if defined (__SUPPORT_LD_DEBUG__)
- _dl_dprintf(2, "%s ", _dl_reltypes[reloc_type]);
+ _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);
+ if (symtab_index)
+ _dl_dprintf(2, "'%s'\n", symname);
+ return -1;
+ }
- DPRINTF("reloc_addr %x: %x\n",reloc_addr,*reloc_addr);
- };
- return goof;
+ /* instructions were modified */
+ PPC_DCBST(reloc_addr);
+ PPC_SYNC;
+ PPC_ICBI(reloc_addr);
+ PPC_ISYNC;
+ out_nocode:
+#if defined (__SUPPORT_LD_DEBUG__)
+ if (_dl_debug_reloc && _dl_debug_detail)
+ _dl_dprintf(_dl_debug_file, "\tpatched: %x ==> %x @ %x\n", 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)
+{
+ struct elf_resolve *tpnt = rpnt->dyn;
+ Elf32_Word *plt, offset, i, num_plt_entries, rel_offset_words;
+
+ num_plt_entries = rel_size / sizeof(ELF_RELOC);
+ plt = (Elf32_Word *)tpnt->dynamic_info[DT_PLTGOT];
+ if (tpnt->dynamic_info[DT_PPC_GOT_IDX] != 0) {
+ /* Secure PLT */
+ Elf32_Addr *got = (Elf32_Addr *)tpnt->dynamic_info[DT_PPC_GOT_IDX];
+ Elf32_Word dlrr = (Elf32_Word) _dl_linux_resolve;
+
+ got[1] = (Elf32_Addr) dlrr;
+ got[2] = (Elf32_Addr) tpnt;
+
+ /* Relocate everything in .plt by the load address offset. */
+ while (num_plt_entries-- != 0)
+ *plt++ += tpnt->loadaddr;
+ return;
+ }
-/* 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 */
+ rel_offset_words = PLT_DATA_START_WORDS(num_plt_entries);
+
+ /* Set up the lazy PLT entries. */
+ offset = PLT_INITIAL_ENTRY_WORDS;
+ i = 0;
+ /* Warning: we don't handle double-sized PLT entries */
+ while (i < num_plt_entries) {
+ plt[offset ] = OPCODE_LI(11, i * 4);
+ plt[offset+1] = OPCODE_B((PLT_TRAMPOLINE_ENTRY_WORDS + 2 - (offset+1)) * 4);
+ i++;
+ offset += 2;
+ }
+ /* Now, we've modified code. We need to write the changes from
+ the data cache to a second-level unified cache, then make
+ sure that stale data in the instruction cache is removed.
+ (In a multiprocessor system, the effect is more complex.)
+ Most of the PLT shouldn't be in the instruction cache, but
+ there may be a little overlap at the start and the end.
+
+ Assumes that dcbst and icbi apply to lines of 16 bytes or
+ more. Current known line sizes are 16, 32, and 128 bytes. */
+ for (i = 0; i < rel_offset_words; i += 4)
+ PPC_DCBST (plt + i);
+ PPC_DCBST (plt + rel_offset_words - 1);
+ PPC_SYNC;
+ PPC_ICBI (plt);
+ PPC_ICBI (plt + rel_offset_words - 1);
+ PPC_ISYNC;
+}
-int _dl_parse_copy_information(struct dyn_elf *xpnt, unsigned long rel_addr,
- unsigned long rel_size, int type)
+static __inline__ 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))
{
- int i;
+ unsigned 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);
+ rpnt = (ELF_RELOC *)(intptr_t)rel_addr;
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);
+ symtab = (Elf32_Sym *)(intptr_t)tpnt->dynamic_info[DT_SYMTAB];
+ strtab = (char *)tpnt->dynamic_info[DT_STRTAB];
- 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);
+ for (i = 0; i < rel_size; i++, rpnt++) {
+ int res;
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);
+ debug_reloc(symtab,strtab,rpnt);
- 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;
-}
+ res = reloc_fnc (tpnt, scope, rpnt, symtab, strtab);
+ if (res==0) continue;
-#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
+ _dl_dprintf(2, "\n%s: ",_dl_progname);
+ if (symtab_index)
+ _dl_dprintf(2, "symbol '%s': ", strtab + symtab[symtab_index].st_name);
-#ifdef __SUPPORT_LD_DEBUG__
-static void debug_sym(Elf32_Sym *symtab,char *strtab,int symtab_index)
-{
- if (_dl_debug_symbols) {
- 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");
+ 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' 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
+ return res;
}
- }
+ if (unlikely(res >0))
+ {
+ _dl_dprintf(2, "can't resolve symbol in lib '%s'.\n", tpnt->libname);
+ return res;
+ }
+ }
+ return 0;
}
-static void debug_reloc(ELF_RELOC *rpnt)
+int _dl_parse_relocation_information(struct dyn_elf *rpnt,
+ unsigned long rel_addr, unsigned long rel_size)
{
- if (_dl_debug_reloc) {
- _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);
- }
+ return _dl_parse(rpnt->dyn, rpnt->dyn->symbol_scope, rel_addr, rel_size, _dl_do_reloc);
}
-
-#endif
-
-
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