Initial version of the dynamic linker code for the CRIS port.

1 files changed, 401 insertions, 0 deletions

diff --git a/ldso/ldso/cris/elfinterp.c b/ldso/ldso/cris/elfinterp.c
new file mode 100644
index 000000000..9a0b42635
--- /dev/null
+++ b/ldso/ldso/cris/elfinterp.c
@@ -0,0 +1,401 @@
+/*
+ * CRIS ELF shared library loader support.
+ *
+ * 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.
+ *
+ * Copyright (C) 2002, Axis Communications AB
+ * All rights reserved
+ *
+ * Author: Tobias Anderberg, <tobiasa@axis.com>
+ *
+ * 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
+
+/* Support for the LD_DEBUG variable. */
+#if defined (SUPPORT_LD_DEBUG) || defined (LD_DEBUG_SYMBOLS)
+static const char *_dl_reltypes_tab[] = {
+	[0]		"R_CRIS_NONE", "R_CRIS_8", "R_CRIS_16", "R_CRIS_32",
+	[4]		"R_CRIS_8_PCREL", "R_CRIS_16_PCREL", "R_CRIS_32_PCREL", "R_CRIS_GNU_VTINHERIT",
+	[8]		"R_CRIS_GNU_VTENTRY", "R_CRIS_COPY", "R_CRIS_GLOB_DAT", "R_CRIS_JUMP_SLOT",
+	[16]	"R_CRIS_RELATIVE", "R_CRIS_16_GOT", "R_CRIS_32_GOT", "R_CRIS_16_GOTPLT",
+	[32]	"R_CRIS_32_GOTPLT", "R_CRIS_32_GOTREL", "R_CRIS_32_PLT_GOTREL", "R_CRIS_32_PLT_PCREL",
+};
+
+static const char *
+_dl_reltypes(int type)
+{ 
+	static char buf[22];
+	const char *str;
+  
+	if (type >= (sizeof(_dl_reltypes_tab) / sizeof(_dl_reltypes_tab[0])) ||
+		NULL == (str = _dl_reltypes_tab[type])) { 
+    		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) { 
+		if (symtab_index) {
+			_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) { 
+		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";
+        
+#ifdef ELF_USES_RELOCA
+		_dl_dprintf(_dl_debug_file, "\n%s\toffset=%x\taddend=%x %s",
+			_dl_reltypes(ELF32_R_TYPE(rpnt->r_info)), rpnt->r_offset, rpnt->r_addend, sym);
+#else
+		_dl_dprintf(_dl_debug_file, "\n%s\toffset=%x %s", _dl_reltypes(ELF32_R_TYPE(rpnt->r_info)),
+			rpnt->r_offset, sym);
+#endif
+	}
+}
+#endif
+
+/* Defined in resolve.S */
+extern int _dl_linux_resolve(void);
+
+unsigned long
+_dl_linux_resolver(struct elf_resolve *tpnt, int reloc_offset)
+{
+  
+	int reloc_type;
+	int symtab_index;
+	char *strtab;
+	char *new_addr;
+	char **got_addr;
+	ELF_RELOC *reloc;
+	Elf32_Sym *symtab;
+	Elf32_Addr instr_addr;
+	
+	reloc = (ELF_RELOC *) (tpnt->dynamic_info[DT_JMPREL] + tpnt->loadaddr) + (reloc_offset >> 3);
+
+	reloc_type = ELF32_R_TYPE(reloc->r_info);
+	symtab_index = ELF32_R_SYM(reloc->r_info);
+
+	symtab = (Elf32_Sym *) (tpnt->dynamic_info[DT_SYMTAB] + tpnt->loadaddr);
+	strtab = (char *) (tpnt->dynamic_info[DT_STRTAB] + tpnt->loadaddr);
+
+	if (reloc_type != R_CRIS_JUMP_SLOT) {
+		_dl_dprintf(_dl_debug_file, "%s: Incorrect relocation type for jump relocations.\n", _dl_progname);
+		_dl_exit(1);
+	}
+
+	/* Fetch the address of the jump instruction to fix up. */
+	instr_addr = ((Elf32_Addr) reloc->r_offset + (Elf32_Addr) tpnt->loadaddr);
+	got_addr = (char **) instr_addr;
+
+#ifdef DL_DEBUG_SYMBOLS
+	_dl_dprintf(_dl_debug_file, "Resolving symbol: %s\n", strtab + symtab[symtab_index].st_name);
+#endif
+
+	/* Fetch the address of the GOT entry. */
+	new_addr = _dl_find_hash(strtab + symtab[symtab_index].st_name, tpnt->symbol_scope, tpnt, 0);
+	
+	if (!new_addr) {
+		_dl_dprintf(_dl_debug_file, "%s: Can't resolv symbol '%s'\n", _dl_progname, strtab + symtab[symtab_index].st_name);
+		_dl_exit(1);
+	}
+
+#if defined (SUPPORT_LD_DEBUG)
+	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);
+	}
+#endif
+
+	*got_addr = new_addr;
+	return (unsigned long) new_addr;
+}
+
+void
+_dl_parse_lazy_relocation_information(struct elf_resolve *tpnt, unsigned long rel_addr, unsigned long rel_size, int type)
+{
+	int i;
+	int reloc_type;
+	int symtab_index;
+	char *strtab;
+	Elf32_Sym *symtab;
+	ELF_RELOC *rpnt;
+	Elf32_Addr *reloc_addr;
+
+	/* Parse 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);
+
+	for (i = 0; i < rel_size; i++, rpnt++) {
+		reloc_addr = (Elf32_Addr *) (tpnt->loadaddr + (Elf32_Addr) rpnt->r_offset);
+		reloc_type = ELF32_R_TYPE(rpnt->r_info);
+		symtab_index = ELF32_R_SYM(rpnt->r_info);
+
+		/*
+		 * Make sure we don't resolv the same symbols as we did
+		 * when ld.so bootstrapped itself.
+		 */
+		if (!symtab_index && tpnt->libtype == program_interpreter)
+		 	continue;
+		if (symtab_index && tpnt->libtype == program_interpreter &&
+			_dl_symbol(strtab + symtab[symtab_index].st_name))
+			continue;
+
+#if defined (SUPPORT_LD_DEBUG) || defined (LD_DEBUG_SYMBOLS)
+	{
+		unsigned long old_val = *reloc_addr;
+
+#endif
+
+		switch (reloc_type) {
+			case R_CRIS_NONE:
+				break;
+			case R_CRIS_JUMP_SLOT:
+				*reloc_addr += (Elf32_Addr) tpnt->loadaddr;
+				break;
+			default:
+				_dl_dprintf(_dl_debug_file, "%s: Can't handle relocation type (lazy).\n",
+					_dl_progname);
+#ifdef SUPPORT_LD_DEBUG
+					_dl_dprintf(_dl_debug_file, "%s ", _dl_reltypes(reloc_type));
+#endif
+				if (symtab_index)
+					_dl_dprintf(_dl_debug_file, "'%s'\n", strtab + symtab[symtab_index].st_name);
+
+				_dl_exit(1);
+		}
+#if defined(SUPPORT_LD_DEBUG)
+		if (_dl_debug_reloc && _dl_debug_detail)
+			_dl_dprintf(_dl_debug_file, "\tpatch: %x ==> %x @ %x", old_val, *reloc_addr, reloc_addr);
+	}
+#endif
+	}
+}
+
+int
+_dl_parse_relocation_information(struct elf_resolve *tpnt, unsigned long rel_addr, unsigned long rel_size, int type)
+{
+	int i;
+	int goof;
+	int reloc_type;
+	int symtab_index;
+	char *strtab;
+	Elf32_Sym *symtab;
+	ELF_RELOC *rpnt;
+	Elf32_Addr *reloc_addr;
+	Elf32_Addr symbol_addr;
+
+	goof = 0;
+	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 = (Elf32_Addr *) (tpnt->loadaddr + (Elf32_Addr) 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 && tpnt->libtype == program_interpreter)
+			continue;
+
+		if (symtab_index) {
+			if (tpnt->libtype == program_interpreter &&
+				_dl_symbol(strtab + symtab[symtab_index].st_name))
+				continue;
+
+			if (symtab[symtab_index].st_shndx != SHN_UNDEF && ELF32_ST_BIND(symtab[symtab_index].st_info) == STB_LOCAL)
+				symbol_addr = (Elf32_Addr) tpnt->loadaddr;
+			else
+				symbol_addr = (Elf32_Addr) _dl_find_hash(strtab + symtab[symtab_index].st_name,
+					tpnt->symbol_scope, (reloc_type == R_CRIS_JUMP_SLOT ? tpnt : NULL), 0);
+
+			/*
+			 * 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(_dl_debug_file, "%s: Can't resolve '%s'\n",
+					_dl_progname, strtab + symtab[symtab_index].st_name);
+				goof++;
+			}
+			
+			symbol_addr += rpnt->r_addend;
+		}
+
+#if defined(SUPPORT_LD_DEBUG)
+	{
+		unsigned long old_val = *reloc_addr;
+		debug_sym(symtab,strtab,symtab_index);
+		debug_reloc(symtab,strtab,rpnt);
+#endif
+		
+		switch (reloc_type) {
+			case R_CRIS_GLOB_DAT:
+			case R_CRIS_JUMP_SLOT:
+			case R_CRIS_32:
+				*reloc_addr = symbol_addr;
+				break;
+			case R_CRIS_RELATIVE:
+				*reloc_addr = (Elf32_Addr) tpnt->loadaddr + rpnt->r_addend;
+				break;
+			case R_CRIS_COPY:
+				*reloc_addr = symbol_addr;
+				break;
+			case R_CRIS_8:
+				*(char *) reloc_addr = symbol_addr;
+				break;
+			case R_CRIS_16:
+				*(short *) reloc_addr = symbol_addr;
+				break;
+			case R_CRIS_8_PCREL:
+				*(char *) reloc_addr = symbol_addr + rpnt->r_addend - (Elf32_Addr) reloc_addr - 1;
+				break;
+			case R_CRIS_16_PCREL:
+				*(short *) reloc_addr = symbol_addr + rpnt->r_addend - (Elf32_Addr) reloc_addr - 2;
+				break;
+			case R_CRIS_32_PCREL:
+				*reloc_addr = symbol_addr + rpnt->r_addend - (Elf32_Addr) reloc_addr - 4;
+				break;
+			case R_CRIS_NONE:
+				break;
+			default:
+				_dl_dprintf(_dl_debug_file, "%s: Can't handle relocation type ", _dl_progname);
+#ifdef SUPPORT_LD_DEBUG
+				_dl_dprintf(_dl_debug_file, "%s\n", _dl_reltypes(reloc_type));
+#endif
+				if (symtab_index) {
+					_dl_dprintf(_dl_debug_file, "'%s'\n", strtab + symtab[symtab_index].st_name);
+					return -1;
+				}
+		}
+#if defined(SUPPORT_LD_DEBUG)
+		if (_dl_debug_reloc && _dl_debug_detail)
+			_dl_dprintf(_dl_debug_file, "\tpatch: %x ==> %x @ %x", old_val, *reloc_addr, reloc_addr);
+	}
+#endif
+	}
+	return goof;
+}
+
+/*
+ * This is done as a seperate step, because there are cases where
+ * information is first copied and later initialized. This results
+ * in the wrong information being copied.
+ */
+int
+_dl_parse_copy_information(struct dyn_elf *xpnt, unsigned long rel_addr, unsigned long rel_size, int type)
+{
+	int i;
+	int reloc_type;
+	int goof;
+	int symtab_index;
+	char *strtab;
+	struct elf_resolve *tpnt;
+	Elf32_Sym *symtab;
+	ELF_RELOC *rpnt;
+	Elf32_Addr *reloc_addr;
+	Elf32_Addr symbol_addr;
+
+	goof = 0;
+	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 = (Elf32_Addr *) (tpnt->loadaddr + (Elf32_Addr) rpnt->r_offset);
+		reloc_type = ELF32_R_TYPE(rpnt->r_info);
+
+		if (reloc_type != R_CRIS_COPY)
+			continue;
+
+		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 = (Elf32_Addr) _dl_find_hash(strtab + 
+				symtab[symtab_index].st_name, xpnt->next, NULL, 1);
+
+			if (!symbol_addr) {
+				_dl_dprintf(_dl_debug_file, "%s: Can't resolv symbol '%s'\n",
+					_dl_progname, strtab + symtab[symtab_index].st_name);
+				goof++;
+			}
+		}
+
+		if (!goof) {
+#if defined(SUPPORT_LD_DEBUG)
+			if (_dl_debug_move)
+				_dl_dprintf(_dl_debug_file, "\n%s move %x bytes from %x to %x",
+					strtab + symtab[symtab_index].st_name,
+					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;
+}