update sparc code using x86_64 as a template

ldso/ldso/sparc/elfinterp.c

@@ -33,236 +33,334 @@ 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. */
+	 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. */
+
+/* Some SPARC opcodes we need to use for self-modifying code.  */
+#define OPCODE_NOP	0x01000000 /* nop */
+#define OPCODE_CALL	0x40000000 /* call ?; add PC-rel word address */
+#define OPCODE_SETHI_G1	0x03000000 /* sethi ?, %g1; add value>>10 */
+#define OPCODE_JMP_G1	0x81c06000 /* jmp %g1+?; add lo 10 bits of value */
+#define OPCODE_SAVE_SP	0x9de3bfa8 /* save %sp, -(16+6)*4, %sp */
+#define OPCODE_BA	0x30800000 /* b,a ?; add PC-rel word address */
 
 extern int _dl_linux_resolve(void);
 
-unsigned int _dl_linux_resolver(unsigned int reloc_entry, unsigned int * plt)
+unsigned long
+_dl_linux_resolver(struct elf_resolve *tpnt, int reloc_entry)
 {
-  int reloc_type;
-  Elf32_Rela * this_reloc;
-  char * strtab;
-  Elf32_Sym * symtab;
-  Elf32_Rela * rel_addr;
-  struct elf_resolve * tpnt;
-  int symtab_index;
-  char * new_addr;
-  char ** got_addr;
-  unsigned int instr_addr;
-  tpnt = (struct elf_resolve *) plt[2];
-
-  rel_addr = (Elf32_Rela *)tpnt->dynamic_info[DT_JMPREL];
-
-  /*
-   * Generate the correct relocation index into the .rela.plt section.
-   */
-  reloc_entry = (reloc_entry >> 10) - 0xc;
-
-  this_reloc = (Elf32_Rela *) ((char *) 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];
-  strtab = (char *)tpnt->dynamic_info[DT_STRTAB];
-
-#ifdef __SUPPORT_LD_DEBUG__
-  if (_dl_debug_symbols) {
-  _dl_dprintf(2, "tpnt = %x\n", tpnt);
-  _dl_dprintf(2, "reloc = %x\n", this_reloc);
-  _dl_dprintf(2, "symtab = %x\n", symtab);
-  _dl_dprintf(2, "strtab = %x\n", strtab);
-  }
+	int reloc_type;
+	ELF_RELOC *this_reloc;
+	char *strtab;
+	ElfW(Sym) *symtab;
+	int symtab_index;
+	char *rel_addr;
+	char *new_addr;
+	char **got_addr;
+	ElfW(Addr) instr_addr;
+	char *symname;
+
+	rel_addr = (char *)tpnt->dynamic_info[DT_JMPREL];
+	/*
+	 * Generate the correct relocation index into the .rela.plt section.
+	 */
+	reloc_entry = (reloc_entry >> 10) - 0xc;
+
+	this_reloc = (ELF_RELOC *)(rel_addr + reloc_entry);
+	reloc_type = ELF_R_TYPE(this_reloc->r_info);
+	symtab_index = ELF_R_SYM(this_reloc->r_info);
+
+	symtab = (ElfW(Sym) *)tpnt->dynamic_info[DT_SYMTAB];
+	strtab = (char *)tpnt->dynamic_info[DT_STRTAB];
+	symname = strtab + symtab[symtab_index].st_name;
+
+	if (unlikely(reloc_type != R_SPARC_JMP_SLOT)) {
+		_dl_dprintf(2, "%s: Incorrect relocation type in jump relocations\n",
+			          _dl_progname);
+		_dl_exit(1);
+	}
+
+	/* Address of the jump instruction to fix up. */
+	instr_addr = (this_reloc->r_offset + 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);
+	if (unlikely(!new_addr)) {
+		_dl_dprintf(2, "%s: Can't resolve symbol '%s'\n", _dl_progname, symname);
+		_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,
+				            "\tpatched: %x ==> %x @ %x\n",
+				            *got_addr, new_addr, got_addr);
+		}
+	}
+	if (!_dl_debug_nofixups)
 #endif
+	{
+		got_addr[1] = (char *) (0x03000000 | (((unsigned int) new_addr >> 10) & 0x3fffff));
+		got_addr[2] = (char *) (0x81c06000 | ((unsigned int) new_addr & 0x3ff));
+	}
 
+	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, ElfW(Sym) *symtab, char *strtab))
+{
+	unsigned int i;
+	char *strtab;
+	ElfW(Sym) *symtab;
+	ELF_RELOC *rpnt;
+	int symtab_index;
 
-  if (unlikely(reloc_type != R_SPARC_JMP_SLOT)) {
-    _dl_dprintf(2, "%s: incorrect relocation type in jump relocations (%d)\n",
-		  _dl_progname, reloc_type);
-    _dl_exit(30);
-  };
+	/* Parse the relocation information. */
+	rpnt = (ELF_RELOC *)rel_addr;
+	rel_size /= sizeof(ELF_RELOC);
 
-  /* Address of jump instruction to fix up */
-  instr_addr  = ((int)this_reloc->r_offset  + (int)tpnt->loadaddr);
-  got_addr = (char **) instr_addr;
+	symtab = (ElfW(Sym) *)tpnt->dynamic_info[DT_SYMTAB];
+	strtab = (char *)tpnt->dynamic_info[DT_STRTAB];
 
-#ifdef __SUPPORT_LD_DEBUG__
-  if (_dl_debug_symbols) {
-  _dl_dprintf(2, "symtab_index %x\n", symtab_index);
+	for (i = 0; i < rel_size; i++, rpnt++) {
+		int res;
 
-	  _dl_dprintf(2, "Resolving symbol %s\n",
-			  strtab + symtab[symtab_index].st_name);
-  }
-#endif
+		symtab_index = ELF_R_SYM(rpnt->r_info);
 
-  /* Get the address of the GOT entry */
-  new_addr = _dl_find_hash(strtab + symtab[symtab_index].st_name,
-  			tpnt->symbol_scope, tpnt, ELF_RTYPE_CLASS_PLT);
-  if(unlikely(!new_addr)) {
-    _dl_dprintf(2, "%s: can't resolve symbol '%s'\n",
-	       _dl_progname, strtab + symtab[symtab_index].st_name);
-    _dl_exit(31);
-  };
+		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 = ELF_R_TYPE(rpnt->r_info);
+
+			_dl_dprintf(2, "can't handle reloc type "
 #if defined (__SUPPORT_LD_DEBUG__)
-	if ((unsigned long) got_addr < 0x40000000)
-	{
-		if (_dl_debug_bindings)
-		{
-			_dl_dprintf(_dl_debug_file, "\nresolve function: %s",
-					strtab + symtab[symtab_index].st_name);
-			if(_dl_debug_detail) _dl_dprintf(_dl_debug_file,
-					"\tpatch %x ==> %x @ %x", *got_addr, new_addr, got_addr);
+				    "%s\n", _dl_reltypes(reloc_type));
+#else
+				    "%x\n", reloc_type);
+#endif
+			_dl_exit(-res);
+		} else if (unlikely(res > 0)) {
+			_dl_dprintf(2, "can't resolve symbol\n");
+			return res;
 		}
 	}
-	if (!_dl_debug_nofixups) {
-		got_addr[1] = (char *) (0x03000000 | (((unsigned int) new_addr >> 10) & 0x3fffff));
-		got_addr[2] = (char *) (0x81c06000 | ((unsigned int) new_addr & 0x3ff));
+
+	return 0;
+}
+
+static int
+_dl_do_reloc(struct elf_resolve *tpnt, struct dyn_elf *scope,
+			 ELF_RELOC *rpnt, ElfW(Sym) *symtab, char *strtab)
+{
+	int reloc_type;
+	int symtab_index;
+	char *symname;
+	ElfW(Sym) *sym;
+	ElfW(Addr) *reloc_addr;
+	ElfW(Addr) symbol_addr;
+#if defined (__SUPPORT_LD_DEBUG__)
+	ElfW(Addr) old_val;
+#endif
+
+	reloc_addr = (ElfW(Addr)*)(tpnt->loadaddr + (unsigned long)rpnt->r_offset);
+	reloc_type = ELF_R_TYPE(rpnt->r_info);
+	symtab_index = ELF_R_SYM(rpnt->r_info);
+	sym = &symtab[symtab_index];
+	symbol_addr = 0;
+	symname = strtab + sym->st_name;
+
+	if (symtab_index) {
+		symbol_addr = (ElfW(Addr))_dl_find_hash(symname, scope, tpnt,
+							    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.
+		 */
+		if (unlikely(!symbol_addr && ELF_ST_BIND(sym->st_info) != STB_WEAK)) {
+			_dl_dprintf(2, "%s: can't resolve symbol '%s'\n", _dl_progname, symname);
+			_dl_exit(1);
+		}
 	}
-#else
-	got_addr[1] = (char *) (0x03000000 | (((unsigned int) new_addr >> 10) & 0x3fffff));
-	got_addr[2] = (char *) (0x81c06000 | ((unsigned int) new_addr & 0x3ff));
+
+#if defined (__SUPPORT_LD_DEBUG__)
+	old_val = *reloc_addr;
 #endif
 
-	_dl_dprintf(2, "Address = %x\n",new_addr);
-	_dl_exit(32);
+	symbol_addr += rpnt->r_addend;	/* Assume copy relocs have zero addend.  */
+
+	switch (reloc_type) {
+		case R_SPARC_NONE:
+			break;
+
+#if 0 /* these dont really seem to be useful */
+		case R_SPARC_8:
+			*(char *) reloc_addr = symbol_addr;
+			break;
+		case R_SPARC_16:
+			*(short *) reloc_addr = symbol_addr;
+			break;
+		case R_SPARC_DISP8:
+			*(char *) reloc_addr = (symbol_addr) - (Elf32_Addr) reloc_addr;
+			break;
+		case R_SPARC_DISP16:
+			*(short *) reloc_addr = (symbol_addr) - (Elf32_Addr) reloc_addr;
+			break;
+#endif
 
-  return (unsigned int) new_addr;
-}
+		case R_SPARC_DISP32:
+			*reloc_addr = symbol_addr - (unsigned int) reloc_addr;
+			break;
+
+		case R_SPARC_LO10:
+			if (!symbol_addr)
+				symbol_addr = tpnt->loadaddr + rpnt->r_addend;
+			else
+				symbol_addr += rpnt->r_addend;
+			*reloc_addr = (*reloc_addr & ~0x3ff)|(symbol_addr & 0x3ff);
+			break;
+
+		case R_SPARC_GLOB_DAT:
+		case R_SPARC_32:
+			*reloc_addr = symbol_addr;
+			break;
+
+		case R_SPARC_JMP_SLOT:
+/*
+value = symbol_addr;
+value += reloc->r_addend;
+disp = value - reloc_addr;
+reloc_addr[1] = OPCODE_JMP_G1 | (value & 0x3ff);
+reloc_addr[0] = OPCODE_SETHI_G1 | (value >> 10);
+			reloc_addr[1] = OPCODE_JMP_G1 | ((symbol_addr-(Elf32_Addr)reloc_addr) & 0x3ff);
+			reloc_addr[0] = OPCODE_SETHI_G1 | ((symbol_addr-(Elf32_Addr)reloc_addr) >> 10);
+*/
+			reloc_addr[1] = 0x03000000 | ((symbol_addr >> 10) & 0x3fffff);
+			reloc_addr[2] = 0x81c06000 | (symbol_addr & 0x3ff);
+			break;
+
+		case R_SPARC_RELATIVE:
+			*reloc_addr += tpnt->loadaddr + rpnt->r_addend;
+			break;
+
+		case R_SPARC_WDISP30:
+			*reloc_addr = (*reloc_addr & 0xc0000000)|
+			         ((symbol_addr - (unsigned int) reloc_addr) >> 2);
+			break;
+
+		case R_SPARC_HI22:
+			if (!symbol_addr)
+				symbol_addr = tpnt->loadaddr + rpnt->r_addend;
+			else
+				symbol_addr += rpnt->r_addend;
+			*reloc_addr = (*reloc_addr & 0xffc00000) | (symbol_addr >> 10);
+			break;
+
+		case R_SPARC_COPY:
+			if (symbol_addr) {
+#if defined (__SUPPORT_LD_DEBUG__)
+				if (_dl_debug_move)
+					_dl_dprintf(_dl_debug_file,
+						    "\t%s move %d bytes from %x to %x\n",
+						    symname, sym->st_size,
+						    symbol_addr, reloc_addr);
+#endif
+
+				_dl_memcpy((char *)reloc_addr,
+					   (char *)symbol_addr,
+					   sym->st_size);
+			} else
+				_dl_dprintf(_dl_debug_file, "no symbol_addr to copy !?\n");
+			break;
+		default:
+			return -1;	/* Calls _dl_exit(1). */
+	}
 
-void _dl_parse_lazy_relocation_information(struct dyn_elf *arg_rpnt,
-	unsigned long rel_addr, unsigned long rel_size)
-{
-  int i;
-  char * strtab;
-  int reloc_type;
-  int symtab_index;
-  Elf32_Sym * symtab;
-  Elf32_Rela * rpnt;
-  unsigned int * reloc_addr;
-  struct elf_resolve * tpnt = arg_rpnt->dyn;
-
-  /* Now parse the relocation information */
-  rpnt = (Elf32_Rela *)rel_addr;
-
-  symtab =  (Elf32_Sym *)tpnt->dynamic_info[DT_SYMTAB];
-  strtab = ( char *)tpnt->dynamic_info[DT_STRTAB];
-
-  for(i=0; i< rel_size; i += sizeof(Elf32_Rela), rpnt++){
-    reloc_addr = (int *) (tpnt->loadaddr + (int)rpnt->r_offset);
-    reloc_type = ELF32_R_TYPE(rpnt->r_info);
-    symtab_index = ELF32_R_SYM(rpnt->r_info);
-
-    switch(reloc_type){
-    case R_SPARC_NONE:
-      break;
-    case R_SPARC_JMP_SLOT:
-      break;
-    default:
-      _dl_dprintf(2, "%s: (LAZY) can't handle reloc type ", _dl_progname);
 #if defined (__SUPPORT_LD_DEBUG__)
-      _dl_dprintf(2, "%s ", _dl_reltypes_tab[reloc_type]);
+	if (_dl_debug_reloc && _dl_debug_detail)
+		_dl_dprintf(_dl_debug_file, "\tpatched: %x ==> %x @ %x\n",
+			    old_val, *reloc_addr, reloc_addr);
 #endif
-      if(symtab_index) _dl_dprintf(2, "'%s'\n",
-				  strtab + symtab[symtab_index].st_name);
-      _dl_exit(33);
-    };
-  };
+
+	return 0;
 }
 
-int _dl_parse_relocation_information(struct dyn_elf *arg_rpnt,
-	unsigned long rel_addr, unsigned long rel_size)
+static int
+_dl_do_lazy_reloc(struct elf_resolve *tpnt, struct dyn_elf *scope,
+		  ELF_RELOC *rpnt, ElfW(Sym) *symtab, char *strtab)
 {
-  int i;
-  char * strtab;
-  int reloc_type;
-  int goof = 0;
-  Elf32_Sym * symtab;
-  Elf32_Rela * rpnt;
-  unsigned int * reloc_addr;
-  unsigned int symbol_addr;
-  int symtab_index;
-  struct elf_resolve * tpnt = arg_rpnt->dyn;
-  /* Now parse the relocation information */
-
-  rpnt = (Elf32_Rela *)rel_addr;
-
-  symtab =  (Elf32_Sym *)tpnt->dynamic_info[DT_SYMTAB];
-  strtab = ( char *)tpnt->dynamic_info[DT_STRTAB];
-
-  for(i=0; i< rel_size; i+= sizeof(Elf32_Rela), rpnt++){
-    reloc_addr = (int *) (tpnt->loadaddr + (int)rpnt->r_offset);
-    reloc_type = ELF32_R_TYPE(rpnt->r_info);
-    symtab_index = ELF32_R_SYM(rpnt->r_info);
-    symbol_addr = 0;
-
-    if(symtab_index) {
-
-      symbol_addr = (unsigned int)
-	_dl_find_hash(strtab + symtab[symtab_index].st_name,
-		      tpnt->symbol_scope, tpnt, elf_machine_type_class(reloc_type));
-
-      if(!symbol_addr &&
-	 ELF32_ST_BIND(symtab [symtab_index].st_info) != STB_WEAK) {
-			_dl_dprintf (2, "%s: can't resolve symbol '%s'\n",
-				     _dl_progname, strtab + symtab[symtab_index].st_name);
-			_dl_exit (1);
-      };
-    };
-    switch(reloc_type){
-    case R_SPARC_NONE:
-	break;
-    case R_SPARC_32:
-      *reloc_addr = symbol_addr + rpnt->r_addend;
-      break;
-    case R_SPARC_DISP32:
-      *reloc_addr = symbol_addr + rpnt->r_addend - (unsigned int) reloc_addr;
-      break;
-    case R_SPARC_GLOB_DAT:
-      *reloc_addr = symbol_addr + rpnt->r_addend;
-      break;
-    case R_SPARC_JMP_SLOT:
-      reloc_addr[1] = 0x03000000 | ((symbol_addr >> 10) & 0x3fffff);
-      reloc_addr[2] = 0x81c06000 | (symbol_addr & 0x3ff);
-      break;
-    case R_SPARC_RELATIVE:
-      *reloc_addr += (unsigned int) tpnt->loadaddr + rpnt->r_addend;
-      break;
-    case R_SPARC_HI22:
-      if (!symbol_addr)
-        symbol_addr = tpnt->loadaddr + rpnt->r_addend;
-      else
-	symbol_addr += rpnt->r_addend;
-      *reloc_addr = (*reloc_addr & 0xffc00000)|(symbol_addr >> 10);
-      break;
-    case R_SPARC_LO10:
-      if (!symbol_addr)
-        symbol_addr = tpnt->loadaddr + rpnt->r_addend;
-      else
-	symbol_addr += rpnt->r_addend;
-      *reloc_addr = (*reloc_addr & ~0x3ff)|(symbol_addr & 0x3ff);
-      break;
-    case R_SPARC_WDISP30:
-      *reloc_addr = (*reloc_addr & 0xc0000000)|
-	((symbol_addr - (unsigned int) reloc_addr) >> 2);
-      break;
-    case R_SPARC_COPY:
-      _dl_memcpy((void *) reloc_addr, (void *) symbol_addr, symtab[symtab_index].st_size);
-      break;
-    default:
-      _dl_dprintf(2, "%s: can't handle reloc type ", _dl_progname);
+	int reloc_type;
+	int symtab_index;
+	ElfW(Addr) *reloc_addr;
+#if defined (__SUPPORT_LD_DEBUG__)
+	ElfW(Addr) old_val;
+#endif
+
+	(void)scope;
+	symtab_index = ELF_R_SYM(rpnt->r_info);
+	(void)strtab;
+
+	reloc_addr = (ElfW(Addr)*)(tpnt->loadaddr + rpnt->r_offset);
+	reloc_type = ELF_R_TYPE(rpnt->r_info);
+
 #if defined (__SUPPORT_LD_DEBUG__)
-      _dl_dprintf(2, "%s ", _dl_reltypes_tab[reloc_type]);
+	old_val = *reloc_addr;
 #endif
-      if (symtab_index)
-	_dl_dprintf(2, "'%s'\n", strtab + symtab[symtab_index].st_name);
-      _dl_exit(34);
-    };
 
-  };
-  return goof;
+	switch (reloc_type) {
+		case R_SPARC_NONE:
+			break;
+		case R_SPARC_JMP_SLOT:
+			break;
+		default:
+			_dl_exit(1);
+	}
+
+#if defined (__SUPPORT_LD_DEBUG__)
+	if (_dl_debug_reloc && _dl_debug_detail)
+		_dl_dprintf(_dl_debug_file, "\tpatched_lazy: %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)
+{
+//	(void)_dl_parse(rpnt->dyn, NULL, rel_addr, rel_size, _dl_do_lazy_reloc);
+	_dl_parse_relocation_information(rpnt, rel_addr, rel_size);
+}
+
+int
+_dl_parse_relocation_information(struct dyn_elf *rpnt,
+				 unsigned long rel_addr,
+				 unsigned long rel_size)
+{
+	return _dl_parse(rpnt->dyn, rpnt->dyn->symbol_scope, rel_addr, rel_size, _dl_do_reloc);
 }