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authorGravatar Vineet Gupta <vgupta@synopsys.com>2013-12-13 14:49:22 +0530
committerGravatar Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>2013-12-20 14:38:23 +0100
commit706d131f720b2a0d674a7efa88be80488cb0c66f (patch)
tree6a552e50efbd2a62a8c047babd4ac19e06547165 /ldso/ldso
parent49904049066daf66e2937fcde860addc6ba23929 (diff)
downloaduClibc-706d131f720b2a0d674a7efa88be80488cb0c66f.tar.gz
uClibc-706d131f720b2a0d674a7efa88be80488cb0c66f.tar.bz2
ldso: Add ARC support
Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
Diffstat (limited to 'ldso/ldso')
-rw-r--r--ldso/ldso/arc/dl-debug.h68
-rw-r--r--ldso/ldso/arc/dl-startup.h89
-rw-r--r--ldso/ldso/arc/dl-syscalls.h5
-rw-r--r--ldso/ldso/arc/dl-sysdep.h150
-rw-r--r--ldso/ldso/arc/elfinterp.c279
-rw-r--r--ldso/ldso/arc/resolve.S57
6 files changed, 648 insertions, 0 deletions
diff --git a/ldso/ldso/arc/dl-debug.h b/ldso/ldso/arc/dl-debug.h
new file mode 100644
index 000000000..ff559f27f
--- /dev/null
+++ b/ldso/ldso/arc/dl-debug.h
@@ -0,0 +1,68 @@
+/*
+ * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
+ *
+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+ */
+static const char *_dl_reltypes_tab[] =
+{
+ "R_ARC_NONE", /* 0 */
+ "R_ARC_8",
+ "R_ARC_16",
+ "R_ARC_24",
+ "R_ARC_32",
+ "R_ARC_B26", /* 5 */
+ "R_ARC_B22_PCREL",
+ "R_ARC_H30",
+ "R_ARC_N8",
+ "R_ARC_N16",
+ "R_ARC_N24", /* 10 */
+ "R_ARC_N32",
+ "R_ARC_SDA",
+ "R_ARC_SECTOFF",
+ "R_ARC_S21H_PCREL",
+ "R_ARC_S21W_PCREL", /* 15 */
+ "R_ARC_S25H_PCREL",
+ "R_ARC_S25W_PCREL",
+ "R_ARC_SDA32",
+ "R_ARC_SDA_LDST",
+ "R_ARC_SDA_LDST1", /* 20 */
+ "R_ARC_SDA_LDST2",
+ "R_ARC_SDA16_LD",
+ "R_ARC_SDA16_LD1",
+ "R_ARC_SDA16_LD2",
+ "R_ARC_S13_PCREL", /* 25 */
+ "R_ARC_W",
+ "R_ARC_32_ME",
+ "R_ARC_N32_ME",
+ "R_ARC_SECTOFF_ME",
+ "R_ARC_SDA32_ME", /* 30 */
+ "R_ARC_W_ME",
+ "R_ARC_H30_ME",
+ "R_ARC_SECTOFF_U8",
+ "R_ARC_SECTOFF_S9",
+ "R_AC_SECTOFF_U8", /* 35 */
+ "R_AC_SECTOFF_U8_1",
+ "R_AC_SECTOFF_U8_2",
+ "R_AC_SECTOFF_S9",
+ "R_AC_SECTOFF_S9_1",
+ "R_AC_SECTOFF_S9_2", /* 40 */
+ "R_ARC_SECTOFF_ME_1",
+ "R_ARC_SECTOFF_ME_2",
+ "R_ARC_SECTOFF_1",
+ "R_ARC_SECTOFF_2",
+ "", /* 45 */
+ "",
+ "",
+ "",
+ "",
+ "R_ARC_PC32", /* 50 */
+ "R_ARC_GOTPC32",
+ "R_ARC_PLT32",
+ "R_ARC_COPY",
+ "R_ARC_GLOB_DAT",
+ "R_ARC_JMP_SLOT", /* 55 */
+ "R_ARC_RELATIVE",
+ "R_ARC_GOTOFF",
+ "R_ARC_GOTPC",
+ "R_ARC_GOT32",
+};
diff --git a/ldso/ldso/arc/dl-startup.h b/ldso/ldso/arc/dl-startup.h
new file mode 100644
index 000000000..4a8d5d786
--- /dev/null
+++ b/ldso/ldso/arc/dl-startup.h
@@ -0,0 +1,89 @@
+/*
+ * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
+ *
+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+ */
+
+/*
+ * vineetg: Refactoring/cleanup of loader entry point
+ * Removed 6 useless insns
+ * Joern Improved it even further:
+ * -better insn scheduling
+ * -no need for conditional code for _dl_skip_args
+ * -use of assembler .&2 expressions vs. @gotpc refs (avoids need for GP)
+ *
+ * What this code does:
+ * -ldso starts execution here when kernel returns from execve()
+ * -calls into generic ldso entry point _dl_start( )
+ * -optionally adjusts argc for executable if exec passed as cmd
+ * -calls into app main with address of finaliser
+ */
+__asm__(
+ ".section .text \n"
+ ".align 4 \n"
+ ".global _start \n"
+ ".hidden _start \n"
+ ".type _start,@function \n"
+
+ "_start: \n"
+ " ; ldso entry point, returns app entry point \n"
+ " bl.d _dl_start \n"
+ " mov_s r0, sp ; pass ptr to aux vector tbl \n"
+
+ " ; If ldso ran as cmd with executable file nm as arg \n"
+ " ; as arg, skip the extra args calc by dl_start() \n"
+ " ld_s r1, [sp] ; orig argc from aux-vec Tbl \n"
+#ifdef STAR_9000535888_FIXED
+ " ld r12, [pcl, _dl_skip_args-.+(.&2)] \n"
+#else
+ " add r12, pcl, _dl_skip_args-.+(.&2) \n"
+ " ld r12, [r12] \n"
+#endif
+
+ " add r2, pcl, _dl_fini-.+(.&2) ; finalizer \n"
+
+ " add2 sp, sp, r12 ; discard argv entries from stack\n"
+ " sub_s r1, r1, r12 ; adjusted argc, on stack \n"
+ " st_s r1, [sp] \n"
+
+ " j_s.d [r0] ; app entry point \n"
+ " mov_s r0, r2 ; ptr to finalizer _dl_fini \n"
+
+ ".size _start,.-_start \n"
+ ".previous \n"
+);
+
+/*
+ * Get a pointer to the argv array. On many platforms this can be just
+ * the address if the first argument, on other platforms we need to
+ * do something a little more subtle here.
+ */
+#define GET_ARGV(ARGVP, ARGS) ARGVP = ((unsigned long*) ARGS + 1)
+
+/*
+ * Dynamic loader bootstrapping:
+ * Since we don't modify text at runtime, these can only be data relos
+ * (so safe to assume that they are word aligned).
+ * And also they HAVE to be RELATIVE relos only
+ * @RELP is the relo entry being processed
+ * @REL is the pointer to the address we are relocating.
+ * @SYMBOL is the symbol involved in the relocation
+ * @LOAD is the load address.
+ */
+
+#define PERFORM_BOOTSTRAP_RELOC(RELP,REL,SYMBOL,LOAD,SYMTAB) \
+do { \
+ int type = ELF32_R_TYPE((RELP)->r_info); \
+ if (likely(type == R_ARC_RELATIVE)) \
+ *REL += (unsigned long) LOAD; \
+ else \
+ _dl_exit(1); \
+}while(0)
+
+/*
+ * This will go away once we have DT_RELACOUNT
+ */
+#define ARCH_NEEDS_BOOTSTRAP_RELOCS
+
+/* we dont need to spit out argc, argv etc for debugging */
+#define NO_EARLY_SEND_STDERR 1
diff --git a/ldso/ldso/arc/dl-syscalls.h b/ldso/ldso/arc/dl-syscalls.h
new file mode 100644
index 000000000..a0b5afc9e
--- /dev/null
+++ b/ldso/ldso/arc/dl-syscalls.h
@@ -0,0 +1,5 @@
+/*
+ * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
+ *
+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+ */
diff --git a/ldso/ldso/arc/dl-sysdep.h b/ldso/ldso/arc/dl-sysdep.h
new file mode 100644
index 000000000..dfde33233
--- /dev/null
+++ b/ldso/ldso/arc/dl-sysdep.h
@@ -0,0 +1,150 @@
+/*
+ * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
+ *
+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+ */
+
+#include "elf.h"
+
+/*
+ * Define this if the system uses RELOCA.
+ */
+#define ELF_USES_RELOCA
+
+/*
+ * Dynamic Linking ABI for ARCompact ISA
+ *
+ * PLT
+ * --------------------------------
+ * | ld r11, [pcl, off-to-GOT[1] | 0 (20 bytes)
+ * | | 4
+ * plt0 | ld r10, [pcl, off-to-GOT[2] | 8
+ * | | 12
+ * | j [r10] | 16
+ * --------------------------------
+ * | Base address of GOT | 20
+ * --------------------------------
+ * | ld r12, [pcl, off-to-GOT[3] | 24 (12 bytes each)
+ * plt1 | |
+ * | j_s.d [r12] | 32
+ * | mov_s r12, pcl | 34
+ * --------------------------------
+ * | | 36
+ * ~ ~
+ * ~ ~
+ * | |
+ * --------------------------------
+ *
+ * GOT
+ * --------------
+ * | [0] |
+ * --------------
+ * | [1] | Module info - setup by ldso
+ * --------------
+ * | [2] | resolver entry point
+ * --------------
+ * | [3] |
+ * | ... | Runtime address for function symbols
+ * | [f] |
+ * --------------
+ * | [f+1] |
+ * | ... | Runtime address for data symbols
+ * | [last] |
+ * --------------
+ */
+
+/*
+ * Initialization sequence for a GOT.
+ * Caller elf_resolve() seeds @GOT_BASE from DT_PLTGOT - which essentially is
+ * pointer to first PLT entry. The actual GOT base is 5th word in PLT
+ *
+ */
+#define INIT_GOT(GOT_BASE,MODULE) \
+do { \
+ unsigned long *__plt_base = (unsigned long *)GOT_BASE; \
+ GOT_BASE = (unsigned long *)(__plt_base[5] + \
+ (unsigned long)MODULE->loadaddr); \
+ GOT_BASE[1] = (unsigned long) MODULE; \
+ GOT_BASE[2] = (unsigned long) _dl_linux_resolve; \
+} while(0)
+
+/* Here we define the magic numbers that this dynamic loader should accept */
+#define MAGIC1 EM_ARCOMPACT
+#undef MAGIC2
+
+/* Used for error messages */
+#define ELF_TARGET "ARC"
+
+struct elf_resolve;
+extern unsigned long _dl_linux_resolver(struct elf_resolve * tpnt,
+ unsigned int plt_pc);
+
+extern unsigned __udivmodsi4(unsigned, unsigned) attribute_hidden;
+
+#define do_rem(result, n, base) ((result) = \
+ \
+ __builtin_constant_p (base) ? (n) % (unsigned) (base) : \
+ __extension__ ({ \
+ register unsigned r1 __asm__ ("r1") = (base); \
+ \
+ __asm("bl.d @__udivmodsi4` mov r0,%1" \
+ : "=r" (r1) \
+ : "r" (n), "r" (r1) \
+ : "r0", "r2", "r3", "r4", "lp_count", "blink", "cc"); \
+ \
+ r1; \
+ }) \
+)
+
+/* ELF_RTYPE_CLASS_PLT iff TYPE describes relocation of a PLT entry, so
+ PLT entries should not be allowed to define the value.
+ ELF_RTYPE_CLASS_NOCOPY iff TYPE should not be allowed to resolve to one
+ of the main executable's symbols, as for a COPY reloc. */
+#define elf_machine_type_class(type) \
+ ((((type) == R_ARC_JMP_SLOT) * ELF_RTYPE_CLASS_PLT) \
+ | (((type) == R_ARC_COPY) * ELF_RTYPE_CLASS_COPY))
+
+/*
+ * Get the runtime address of GOT[0]
+ */
+static __always_inline Elf32_Addr elf_machine_dynamic(void)
+{
+ Elf32_Addr dyn;
+
+ __asm__("ld %0,[pcl,_DYNAMIC@gotpc]\n\t" : "=r" (dyn));
+ return dyn;
+
+/*
+ * Another way would have been to simply return GP, which due to some
+ * PIC reference would be automatically setup by gcc in caller
+ * register Elf32_Addr *got __asm__ ("gp"); return *got;
+ */
+}
+
+/* Return the run-time load address of the shared object. */
+static __always_inline Elf32_Addr elf_machine_load_address(void)
+{
+ /* To find the loadaddr we subtract the runtime addr of any symbol
+ * say _dl_start from it's build-time addr.
+ */
+ Elf32_Addr addr, tmp;
+ __asm__ (
+ "ld %1, [pcl, _dl_start@gotpc] ;build addr of _dl_start \n"
+ "add %0, pcl, _dl_start-.+(.&2) ;runtime addr of _dl_start \n"
+ "sub %0, %0, %1 ;delta \n"
+ : "=&r" (addr), "=r"(tmp)
+ );
+ return addr;
+}
+
+static __always_inline void
+elf_machine_relative (Elf32_Addr load_off, const Elf32_Addr rel_addr,
+ Elf32_Word relative_count)
+{
+ Elf32_Rel * rpnt = (void *) rel_addr;
+ --rpnt;
+ do {
+ Elf32_Addr *const reloc_addr = (void *) (load_off + (++rpnt)->r_offset);
+ *reloc_addr += load_off;
+ } while (--relative_count);
+}
diff --git a/ldso/ldso/arc/elfinterp.c b/ldso/ldso/arc/elfinterp.c
new file mode 100644
index 000000000..a3d741b65
--- /dev/null
+++ b/ldso/ldso/arc/elfinterp.c
@@ -0,0 +1,279 @@
+/*
+ * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
+ *
+ * Lots of code copied from ../i386/elfinterp.c, so:
+ * Copyright (c) 1994-2000 Eric Youngdale, Peter MacDonald,
+ * David Engel, Hongjiu Lu and Mitch D'Souza
+ * Copyright (C) 2001-2002, Erik Andersen
+ * All rights reserved.
+ *
+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+ */
+#include "ldso.h"
+
+#define ARC_PLT_SIZE 12
+
+unsigned long
+_dl_linux_resolver(struct elf_resolve *tpnt, unsigned int plt_pc)
+{
+ ELF_RELOC *this_reloc, *rel_base;
+ char *strtab, *symname, *new_addr;
+ ElfW(Sym) *symtab;
+ int symtab_index;
+ unsigned int *got_addr;
+ unsigned long plt_base;
+ int plt_idx;
+
+ /* start of .rela.plt */
+ rel_base = (ELF_RELOC *)(tpnt->dynamic_info[DT_JMPREL]);
+
+ /* starts of .plt (addr of PLT0) */
+ plt_base = tpnt->dynamic_info[DT_PLTGOT];
+
+ /*
+ * compute the idx of the yet-unresolved PLT entry in .plt
+ * Same idx will be used to find the relo entry in .rela.plt
+ */
+ plt_idx = (plt_pc - plt_base)/ARC_PLT_SIZE - 2; /* ignoring 2 dummy PLTs */
+
+ this_reloc = rel_base + plt_idx;
+
+ symtab_index = ELF_R_SYM(this_reloc->r_info);
+ symtab = (ElfW(Sym) *)(intptr_t) (tpnt->dynamic_info[DT_SYMTAB]);
+ strtab = (char *) (tpnt->dynamic_info[DT_STRTAB]);
+ symname= strtab + symtab[symtab_index].st_name;
+
+ /* relo-offset to fixup, shd be a .got entry */
+ got_addr = (unsigned int *)(this_reloc->r_offset + tpnt->loadaddr);
+
+ /* Get the address of the GOT entry */
+ new_addr = _dl_find_hash(symname, &_dl_loaded_modules->symbol_scope, tpnt,
+ ELF_RTYPE_CLASS_PLT, NULL);
+
+ 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 (_dl_debug_bindings) {
+ _dl_dprintf(_dl_debug_file, "\nresolve function: %s", symname);
+ if(_dl_debug_detail)
+ _dl_dprintf(_dl_debug_file, "\n\tpatched %x ==> %pc @ %pl\n",
+ *got_addr, new_addr, got_addr);
+ }
+
+ if (!_dl_debug_nofixups)
+ *got_addr = (unsigned int)new_addr;
+#else
+ /* Update the .got entry with the runtime address of symbol */
+ *got_addr = (unsigned int)new_addr;
+#endif
+
+ /*
+ * Return the new addres, where the asm trampoline will jump to
+ * after re-setting up the orig args
+ */
+ return (unsigned long) new_addr;
+}
+
+
+static int
+_dl_do_reloc(struct elf_resolve *tpnt, struct r_scope_elem *scope,
+ ELF_RELOC *rpnt, ElfW(Sym) *symtab, char *strtab)
+{
+ int reloc_type;
+ int symtab_index;
+ char *symname;
+ unsigned long *reloc_addr;
+ unsigned long symbol_addr;
+#if defined __SUPPORT_LD_DEBUG__
+ unsigned long old_val = 0;
+#endif
+ struct symbol_ref sym_ref;
+
+ reloc_addr = (unsigned long *)(tpnt->loadaddr + rpnt->r_offset);
+ reloc_type = ELF_R_TYPE(rpnt->r_info);
+ symtab_index = ELF_R_SYM(rpnt->r_info);
+ symbol_addr = 0;
+
+ sym_ref.sym = &symtab[symtab_index];
+ sym_ref.tpnt = NULL;
+
+#if defined __SUPPORT_LD_DEBUG__
+ if (reloc_addr)
+ old_val = *reloc_addr;
+#endif
+
+ if (symtab_index) {
+ symname = strtab + symtab[symtab_index].st_name;
+ 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
+ && ELF_ST_BIND(symtab[symtab_index].st_info) != STB_WEAK)) {
+ /* Non-fatal if called from dlopen, hence different ret code */
+ return 1;
+ }
+ } else if (reloc_type == R_ARC_RELATIVE ) {
+ *reloc_addr += tpnt->loadaddr;
+ goto log_entry;
+ }
+
+ switch (reloc_type) {
+ case R_ARC_32:
+ *reloc_addr += symbol_addr + rpnt->r_addend;
+ break;
+ case R_ARC_PC32:
+ *reloc_addr += symbol_addr + rpnt->r_addend - (unsigned long) reloc_addr;
+ break;
+ case R_ARC_GLOB_DAT:
+ case R_ARC_JMP_SLOT:
+ *reloc_addr = symbol_addr;
+ break;
+ case R_ARC_COPY:
+ _dl_memcpy((void *) reloc_addr,(void *) symbol_addr,
+ symtab[symtab_index].st_size);
+ break;
+ default:
+ return -1;
+ }
+
+log_entry:
+#if defined __SUPPORT_LD_DEBUG__
+ if(_dl_debug_detail)
+ _dl_dprintf(_dl_debug_file,"\tpatched: %lx ==> %lx @ %pl: addend %x ",
+ old_val, *reloc_addr, reloc_addr, rpnt->r_addend);
+#endif
+
+ return 0;
+}
+
+static int
+_dl_do_lazy_reloc(struct elf_resolve *tpnt, struct r_scope_elem *scope,
+ ELF_RELOC *rpnt)
+{
+ int reloc_type;
+ unsigned long *reloc_addr;
+#if defined __SUPPORT_LD_DEBUG__
+ unsigned long old_val;
+#endif
+
+ reloc_addr = (unsigned long *)(tpnt->loadaddr + rpnt->r_offset);
+ reloc_type = ELF_R_TYPE(rpnt->r_info);
+
+#if defined __SUPPORT_LD_DEBUG__
+ old_val = *reloc_addr;
+#endif
+
+ switch (reloc_type) {
+ case R_ARC_JMP_SLOT:
+ *reloc_addr += tpnt->loadaddr;
+ break;
+ default:
+ return -1;
+ }
+
+#if defined __SUPPORT_LD_DEBUG__
+ if(_dl_debug_reloc && _dl_debug_detail)
+ _dl_dprintf(_dl_debug_file, "\tpatched: %lx ==> %lx @ %pl\n",
+ old_val, *reloc_addr, reloc_addr);
+#endif
+
+ return 0;
+}
+
+#define ___DO_LAZY 1
+#define ___DO_NOW 2
+
+static int _dl_parse(struct elf_resolve *tpnt, struct r_scope_elem *scope,
+ unsigned long rel_addr, unsigned long rel_size, int type)
+{
+ unsigned int i;
+ char *strtab;
+ ElfW(Sym) *symtab;
+ ELF_RELOC *rpnt;
+ int symtab_index;
+ int res = 0;
+
+ /* Now parse the relocation information */
+ rpnt = (ELF_RELOC *)(intptr_t) (rel_addr);
+ rel_size = rel_size / sizeof(ELF_RELOC);
+
+ symtab = (ElfW(Sym) *)(intptr_t) (tpnt->dynamic_info[DT_SYMTAB]);
+ strtab = (char *) (tpnt->dynamic_info[DT_STRTAB]);
+
+ for (i = 0; i < rel_size; i++, rpnt++) {
+
+ symtab_index = ELF_R_SYM(rpnt->r_info);
+
+ debug_sym(symtab,strtab,symtab_index);
+ debug_reloc(symtab,strtab,rpnt);
+
+ /* constant propagation subsumes the 'if' */
+ if (type == ___DO_LAZY)
+ res = _dl_do_lazy_reloc(tpnt, scope, rpnt);
+ else
+ res = _dl_do_reloc(tpnt, scope, rpnt, symtab, strtab);
+
+ if (res != 0)
+ break;
+ }
+
+ if (unlikely(res != 0)) {
+ if (res < 0) {
+ int reloc_type = ELF_R_TYPE(rpnt->r_info);
+#if defined __SUPPORT_LD_DEBUG__
+ _dl_dprintf(2, "can't handle reloc type %s\n ",
+ _dl_reltypes(reloc_type));
+#else
+ _dl_dprintf(2, "can't handle reloc type %x\n",
+ reloc_type);
+#endif
+ _dl_exit(-res);
+ } else {
+ _dl_dprintf(2, "can't resolve symbol\n");
+ /* Fall thru to return res */
+ }
+ }
+
+ return res;
+}
+
+void
+_dl_parse_lazy_relocation_information(struct dyn_elf *rpnt,
+ unsigned long rel_addr,
+ unsigned long rel_size)
+{
+ /* This func is called for processing .rela.plt of loaded module(s)
+ * The relo entries handled are JMP_SLOT type for fixing up .got slots
+ * for external function calls.
+ * This function doesn't resolve the slots: that is done lazily at
+ * runtime. The build linker (at least thats what happens for ARC) had
+ * pre-init the .got slots to point to PLT0. All that is done here is
+ * to fix them up to point to load value of PLT0 (as opposed to the
+ * build value).
+ * On ARC, the loadaddr of dyn exec is zero, thus elfaddr == loadaddr
+ * Thus there is no point in adding "0" to values and un-necessarily
+ * stir up the caches and TLB.
+ * For lsdo processing busybox binary, this skips over 380 relo entries
+ */
+ if (rpnt->dyn->loadaddr != 0)
+ _dl_parse(rpnt->dyn, NULL, rel_addr, rel_size, ___DO_LAZY);
+}
+
+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, ___DO_NOW);
+}
diff --git a/ldso/ldso/arc/resolve.S b/ldso/ldso/arc/resolve.S
new file mode 100644
index 000000000..891f66b97
--- /dev/null
+++ b/ldso/ldso/arc/resolve.S
@@ -0,0 +1,57 @@
+/*
+ * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
+ *
+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+ */
+
+#include <sysdep.h>
+#include <sys/syscall.h>
+
+; Save the registers which resolver could possibly clobber
+; r0-r9: args to the function - symbol being resolved
+; r10-r12 are already clobbered by PLTn, PLT0 thus neednot be saved
+
+.macro SAVE_CALLER_SAVED
+ push_s r0
+ push_s r1
+ push_s r2
+ push_s r3
+ st.a r4, [sp, -4]
+ st.a r5, [sp, -4]
+ st.a r6, [sp, -4]
+ st.a r7, [sp, -4]
+ st.a r8, [sp, -4]
+ st.a r9, [sp, -4]
+ push_s blink
+.endm
+
+.macro RESTORE_CALLER_SAVED_BUT_R0
+ ld.ab blink,[sp, 4]
+ ld.ab r9, [sp, 4]
+ ld.ab r8, [sp, 4]
+ ld.ab r7, [sp, 4]
+ ld.ab r6, [sp, 4]
+ ld.ab r5, [sp, 4]
+ ld.ab r4, [sp, 4]
+ pop_s r3
+ pop_s r2
+ pop_s r1
+.endm
+
+; Upon entry, PLTn, which led us here, sets up the following regs
+; r11 = Module info (tpnt pointer as expected by resolver)
+; r12 = PC of the PLTn itself - needed by resolver to find
+; corresponding .rela.plt entry
+
+ENTRY(_dl_linux_resolve)
+ ; args to func being resolved, which resolver might clobber
+ SAVE_CALLER_SAVED
+
+ mov_s r1, r12
+ bl.d _dl_linux_resolver
+ mov r0, r11
+
+ RESTORE_CALLER_SAVED_BUT_R0
+ j_s.d [r0] ; r0 has resolved function addr
+ pop_s r0 ; restore first arg to resolved call
+END(_dl_linux_resolve)