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#include "ldso.h"
unsigned long
_dl_linux_resolver(struct elf_resolve *tpnt, int reloc_entry)
{
ELF_RELOC *this_reloc;
int symtab_index;
//char *rel_tab;
Elf32_Sym *sym_tab;
char *str_tab;
char *sym_name;
char *sym_addr;
char **reloc_addr;
this_reloc = (ELF_RELOC *)tpnt->dynamic_info[DT_JMPREL];
this_reloc += reloc_entry;
//this_reloc = (ELF_RELOC *)(intptr_t)(rel_tab + reloc_entry);
symtab_index = ELF32_R_SYM(this_reloc->r_info);
sym_tab = (Elf32_Sym *)(intptr_t)tpnt->dynamic_info[DT_SYMTAB];
str_tab = (char *)tpnt->dynamic_info[DT_STRTAB];
sym_name = str_tab + sym_tab[symtab_index].st_name;
reloc_addr = (char **)((unsigned long)this_reloc->r_offset +
(unsigned long)tpnt->loadaddr);
sym_addr = _dl_find_hash(sym_name, &_dl_loaded_modules->symbol_scope, tpnt, ELF_RTYPE_CLASS_PLT, NULL);
if (unlikely(!sym_addr)) {
_dl_dprintf(2, "%s: 1can't resolve symbol '%s' in lib '%s'.\n", _dl_progname, sym_name, tpnt->libname);
_dl_exit(1);
}
*reloc_addr = sym_addr;
return (unsigned long)sym_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, Elf32_Sym *symtab, char *strtab))
{
unsigned int i;
char *strtab;
Elf32_Sym *symtab;
ELF_RELOC *rpnt;
int symtab_index;
/* Parse the relocation information. */
rpnt = (ELF_RELOC *)(intptr_t)rel_addr;
rel_size /= sizeof(ELF_RELOC);
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++) {
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, "2can't handle reloc type '%s' in lib '%s'\n",
_dl_reltypes(reloc_type), tpnt->libname);
#else
_dl_dprintf(2, "3can't handle reloc type %x in lib '%s'\n",
reloc_type, tpnt->libname);
#endif
return res;
} else if (unlikely(res > 0)) {
_dl_dprintf(2, "4can't resolve symbol in lib '%s'.\n", tpnt->libname);
return res;
}
}
return 0;
}
static int
_dl_do_reloc(struct elf_resolve *tpnt, struct r_scope_elem *scope,
ELF_RELOC *rpnt, Elf32_Sym *symtab, char *strtab)
{
int reloc_type;
int symtab_index;
char *symname;
unsigned long *reloc_addr;
unsigned long symbol_addr;
struct symbol_ref sym_ref;
#if defined (__SUPPORT_LD_DEBUG__)
unsigned long old_val;
#endif
#if defined USE_TLS && USE_TLS
struct elf_resolve *tls_tpnt = NULL;
#endif
#if defined(__CSKYABIV2__)
unsigned int insn_opcode = 0x0;
unsigned short *opcode16_addr;
#endif
reloc_addr = (unsigned long *)(intptr_t)(tpnt->loadaddr + (unsigned long)rpnt->r_offset);
#if defined(__CSKYABIV2__)
opcode16_addr = (unsigned short *)reloc_addr;
#endif
reloc_type = ELF32_R_TYPE(rpnt->r_info);
if (reloc_type == R_CKCORE_NONE)
return 0;
symtab_index = ELF32_R_SYM(rpnt->r_info);
symbol_addr = 0;
sym_ref.sym = &symtab[symtab_index];
sym_ref.tpnt = NULL;
symname = strtab + symtab[symtab_index].st_name;
if (symtab_index) {
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 (unlikely(!symbol_addr && ELF32_ST_BIND(symtab[symtab_index].st_info) != STB_WEAK))
if (!symbol_addr && (ELF_ST_TYPE(symtab[symtab_index].st_info) != STT_TLS)
&& (ELF_ST_BIND(symtab[symtab_index].st_info) != STB_WEAK))
return 1;
#if defined USE_TLS && USE_TLS
tls_tpnt = sym_ref.tpnt;
#endif
}else{
/*
* 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_name;
#if defined USE_TLS && USE_TLS
tls_tpnt = tpnt;
#endif
}
#if defined (__SUPPORT_LD_DEBUG__)
old_val = *reloc_addr;
#endif
switch (reloc_type) { /* need modify */
case R_CKCORE_NONE:
case R_CKCORE_PCRELJSR_IMM11BY2:
break;
case R_CKCORE_ADDR32:
*reloc_addr = symbol_addr + rpnt->r_addend;
break;
case R_CKCORE_GLOB_DAT:
case R_CKCORE_JUMP_SLOT:
*reloc_addr = symbol_addr;
break;
case R_CKCORE_RELATIVE:
*reloc_addr = (unsigned long)tpnt->loadaddr + rpnt->r_addend;
break;
#if defined(__CSKYABIV2__)
case R_CKCORE_ADDR_HI16:
insn_opcode = (*opcode16_addr << 16) | (*(opcode16_addr + 1));
insn_opcode = (insn_opcode & 0xffff0000)
| (((symbol_addr + rpnt->r_addend) >> 16) & 0xffff);
*(opcode16_addr++) = (unsigned short)(insn_opcode >> 16);
*opcode16_addr = (unsigned short)(insn_opcode & 0xffff);
break;
case R_CKCORE_ADDR_LO16:
insn_opcode = (*opcode16_addr << 16) | (*(opcode16_addr + 1));
insn_opcode = (insn_opcode & 0xffff0000)
| ((symbol_addr + rpnt->r_addend) & 0xffff);
*(opcode16_addr++) = (unsigned short)(insn_opcode >> 16);
*opcode16_addr = (unsigned short)(insn_opcode & 0xffff);
break;
case R_CKCORE_PCREL_IMM26BY2:
{
unsigned int offset = ((symbol_addr + rpnt->r_addend -
(unsigned int)reloc_addr) >> 1);
insn_opcode = (*opcode16_addr << 16) | (*(opcode16_addr + 1));
if (offset > 0x3ffffff){
_dl_dprintf(2, "%s:The reloc R_CKCORE_PCREL_IMM26BY2 cannot reach the symbol '%s'.\n", _dl_progname, symname);
_dl_exit(1);
}
insn_opcode = (insn_opcode & ~0x3ffffff) | offset;
*(opcode16_addr++) = (unsigned short)(insn_opcode >> 16);
*opcode16_addr = (unsigned short)(insn_opcode & 0xffff);
break;
}
case R_CKCORE_PCREL_JSR_IMM26BY2:
break;
#endif
case R_CKCORE_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;
#if defined USE_TLS && USE_TLS
case R_CKCORE_TLS_DTPMOD32:
*reloc_addr = tls_tpnt->l_tls_modid;
break;
case R_CKCORE_TLS_DTPOFF32:
*reloc_addr += symbol_addr;
break;
case R_CKCORE_TLS_TPOFF32:
CHECK_STATIC_TLS ((struct link_map *) tls_tpnt);
*reloc_addr += tls_tpnt->l_tls_offset + symbol_addr;
break;
#endif
default:
return -1;
}
#if defined (__SUPPORT_LD_DEBUG__)
if (_dl_debug_reloc && _dl_debug_detail)
_dl_dprintf(_dl_debug_file, "\n\tpatched: %x ==> %x @ %x",
old_val, *reloc_addr, reloc_addr);
#endif
return 0;
}
static int
_dl_do_lazy_reloc(struct elf_resolve *tpnt, struct r_scope_elem *scope,
ELF_RELOC *rpnt, Elf32_Sym *symtab, char *strtab)
{
int reloc_type;
unsigned long *reloc_addr;
#if defined (__SUPPORT_LD_DEBUG__)
unsigned long old_val;
#endif
reloc_addr = (unsigned long *)(intptr_t)(tpnt->loadaddr + (unsigned long)rpnt->r_offset);
reloc_type = ELF32_R_TYPE(rpnt->r_info);
#if defined (__SUPPORT_LD_DEBUG__)
old_val = *reloc_addr;
#endif
switch (reloc_type) {
case R_CKCORE_NONE:
case R_CKCORE_PCRELJSR_IMM11BY2:
break;
case R_CKCORE_JUMP_SLOT:
*reloc_addr = (unsigned long)tpnt->loadaddr + rpnt->r_addend;
break;
default:
return -1;
}
#if defined (__SUPPORT_LD_DEBUG__)
if (_dl_debug_reloc && _dl_debug_detail)
_dl_dprintf(_dl_debug_file, "\n\tpatched: %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)
{
(void)_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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