307 lines
8.9 KiB
C
307 lines
8.9 KiB
C
/* Machine-dependent ELF dynamic relocation inline functions. Sparc64 version.
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Copyright (C) 1997 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc.,
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59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#define ELF_MACHINE_NAME "sparc64"
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#include <assert.h>
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#include <string.h>
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#include <link.h>
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#include <sys/param.h>
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#include <sysdep.h>
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/* Return nonzero iff E_MACHINE is compatible with the running host. */
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static inline int
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elf_machine_matches_host (Elf64_Half e_machine)
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{
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return e_machine == EM_SPARC64;
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}
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/* Return the link-time address of _DYNAMIC. Conveniently, this is the
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first element of the GOT. This must be inlined in a function which
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uses global data. */
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static inline Elf64_Addr
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elf_machine_dynamic (void)
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{
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register Elf64_Addr *got asm ("%l7");
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return *got;
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}
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/* Return the run-time load address of the shared object. */
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static inline Elf64_Addr
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elf_machine_load_address (void)
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{
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Elf64_Addr here;
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__asm("rd %pc,%0\n\t"
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"ba 1f\n\t"
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" add %0,12,%0\n\t"
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".weak __load_address_undefined\n\t"
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"call __load_address_undefined\n"
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"1:"
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: "=r"(here));
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return here + (*(int *)here << 2);
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}
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#ifdef RESOLVE
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/* Perform the relocation specified by RELOC and SYM (which is fully resolved).
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MAP is the object containing the reloc. */
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static inline void
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elf_machine_rela (struct link_map *map, const Elf64_Rela *reloc,
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const Elf64_Sym *sym, const struct r_found_version *version)
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{
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Elf64_Addr *const reloc_addr = (void *) (map->l_addr + reloc->r_offset);
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Elf64_Addr loadbase;
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#ifndef RTLD_BOOTSTRAP
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/* This is defined in rtld.c, but nowhere in the static libc.a; make the
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reference weak so static programs can still link. This declaration
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cannot be done when compiling rtld.c (i.e. #ifdef RTLD_BOOTSTRAP)
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because rtld.c contains the common defn for _dl_rtld_map, which is
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incompatible with a weak decl in the same file. */
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weak_extern (_dl_rtld_map);
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#endif
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if (ELF64_R_TYPE (reloc->r_info) == R_SPARC_RELATIVE)
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{
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#ifndef RTLD_BOOTSTRAP
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if (map != &_dl_rtld_map) /* Already done in rtld itself. */
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#endif
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*reloc_addr += map->l_addr + reloc->r_addend;
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}
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else
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{
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const Elf64_Sym *const refsym = sym;
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Elf64_Addr value;
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if (sym->st_shndx != SHN_UNDEF &&
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ELF64_ST_BIND (sym->st_info) == STB_LOCAL)
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value = map->l_addr;
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else
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{
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value = RESOLVE (&sym, version, ELF64_R_TYPE (reloc->r_info));
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if (sym)
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value += sym->st_value;
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}
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value += reloc->r_addend; /* Assume copy relocs have zero addend. */
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switch (ELF64_R_TYPE (reloc->r_info))
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{
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case R_SPARC_COPY:
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if (sym->st_size > refsym->st_size
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|| (_dl_verbose && sym->st_size < refsym->st_size))
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{
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extern char **_dl_argv;
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const char *strtab;
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strtab = ((void *) map->l_addr
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+ map->l_info[DT_STRTAB]->d_un.d_ptr);
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_dl_sysdep_error (_dl_argv[0] ?: "<program name unknown>",
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": Symbol `", strtab + refsym->st_name,
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"' has different size in shared object, "
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"consider re-linking\n", NULL);
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}
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memcpy (reloc_addr, (void *) value, MIN (sym->st_size,
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refsym->st_size));
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break;
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case R_SPARC_GLOB_DAT:
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/* case R_SPARC_64: */
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case R_SPARC_JMP_SLOT:
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*reloc_addr = value;
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break;
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case R_SPARC_8:
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*(char *) reloc_addr = value;
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break;
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case R_SPARC_16:
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*(short *) reloc_addr = value;
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break;
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case R_SPARC_DISP8:
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*(char *) reloc_addr = (value - (Elf64_Addr) reloc_addr);
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break;
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case R_SPARC_DISP16:
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*(short *) reloc_addr = (value - (Elf64_Addr) reloc_addr);
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break;
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case R_SPARC_DISP32:
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*(unsigned int *)reloc_addr = (value - (Elf64_Addr) reloc_addr);
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break;
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case R_SPARC_LO10:
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*(unsigned *)reloc_addr = (*(unsigned *)reloc_addr & ~0x3ff)
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| (value & 0x3ff);
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break;
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case R_SPARC_WDISP30:
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*(unsigned *)reloc_addr = ((*(unsigned *)reloc_addr & 0xc0000000)
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| ((value - (Elf64_Addr) reloc_addr) >> 2));
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break;
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case R_SPARC_HI22:
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*(unsigned *)reloc_addr = (*(unsigned *)reloc_addr & 0xffc00000)
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| (value >> 10);
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break;
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case R_SPARC_NONE: /* Alright, Wilbur. */
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break;
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default:
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assert (! "unexpected dynamic reloc type");
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break;
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}
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}
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}
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static inline void
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elf_machine_lazy_rel (struct link_map *map, const Elf64_Rela *reloc)
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{
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switch (ELF64_R_TYPE (reloc->r_info))
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{
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case R_SPARC_NONE:
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break;
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case R_SPARC_JMP_SLOT:
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break;
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default:
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assert (! "unexpected PLT reloc type");
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break;
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}
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}
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#endif /* RESOLVE */
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/* Nonzero iff TYPE should not be allowed to resolve to one of
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the main executable's symbols, as for a COPY reloc. */
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#define elf_machine_lookup_noexec_p(type) ((type) == R_SPARC_COPY)
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/* Nonzero iff TYPE describes relocation of a PLT entry, so
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PLT entries should not be allowed to define the value. */
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#define elf_machine_lookup_noplt_p(type) ((type) == R_SPARC_JMP_SLOT)
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/* A reloc type used for ld.so cmdline arg lookups to reject PLT entries. */
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#define ELF_MACHINE_RELOC_NOPLT R_SPARC_JMP_SLOT
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/* The SPARC never uses Elf64_Rel relocations. */
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#define ELF_MACHINE_NO_REL 1
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/* Set up the loaded object described by L so its unrelocated PLT
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entries will jump to the on-demand fixup code in dl-runtime.c. */
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static inline int
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elf_machine_runtime_setup (struct link_map *l, int lazy)
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{
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Elf64_Addr *got;
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extern void _dl_runtime_resolve (Elf64_Word);
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if (l->l_info[DT_JMPREL] && lazy)
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{
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got = (Elf64_Addr *) (l->l_addr + l->l_info[DT_PLTGOT]->d_un.d_ptr);
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got[1] = (Elf64_Addr) l; /* Identify this shared object. */
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/* This function will get called to fix up the GOT entry indicated by
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the offset on the stack, and then jump to the resolved address. */
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got[2] = (Elf64_Addr) &_dl_runtime_resolve;
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}
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return lazy;
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}
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/* This code is used in dl-runtime.c to call the `fixup' function
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and then redirect to the address it returns. */
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#define ELF_MACHINE_RUNTIME_TRAMPOLINE asm ("\
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.globl _dl_runtime_resolve
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.type _dl_runtime_resolve, @function
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_dl_runtime_resolve:
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save %sp, -160, %sp
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mov %g1, %o1
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call fixup
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mov %g2, %o0
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jmp %o0
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restore
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.size _dl_runtime_resolve, .-_dl_runtime_resolve
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");
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/* The PLT uses Elf64_Rela relocs. */
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#define elf_machine_relplt elf_machine_rela
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/* Mask identifying addresses reserved for the user program,
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where the dynamic linker should not map anything. */
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#define ELF_MACHINE_USER_ADDRESS_MASK ???
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/* Initial entry point code for the dynamic linker.
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The C function `_dl_start' is the real entry point;
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its return value is the user program's entry point. */
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#define __S1(x) #x
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#define __S(x) __S1(x)
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#define RTLD_START __asm__ ( "\
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.global _start
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.type _start, @function
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_start:
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/* Make room for functions to drop their arguments on the stack. */
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sub %sp, 6*8, %sp
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/* Pass pointer to argument block to _dl_start. */
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call _dl_start
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add %sp," __S(STACK_BIAS) "+22*8,%o0
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/* FALLTHRU */
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.global _dl_start_user
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.type _dl_start_user, @function
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_dl_start_user:
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/* Load the GOT register. */
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1: rd %pc,%g1
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sethi %hi(_GLOBAL_OFFSET_TABLE_-(1b-.)),%l7
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or %l2,%lo(_GLOBAL_OFFSET_TABLE_-(1b-.)),%l7
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add %l7,%g1,%l7
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/* Save the user entry point address in %l0. */
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mov %o0,%l0
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/* See if we were run as a command with the executable file name as an
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extra leading argument. If so, adjust the stack pointer. */
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sethi %hi(_dl_skip_args), %g2
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or %g2, %lo(_dl_skip_args), %g2
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ld [%l7+%g2], %i0
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brz,pt %i0, 2f
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ldx [%sp+" __S(STACK_BIAS) "+22*8], %i1
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sub %i1, %i0, %i1
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sllx %i0, 3, %i2
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add %sp, %i2, %sp
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stx %i1, [%sp+" __S(STACK_BIAS) "+22*8]
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/* Load _dl_default_scope[2] to pass to _dl_init_next. */
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2: sethi %hi(_dl_default_scope), %g2
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or %g2, %lo(_dl_defalt_scope), %g2
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add %g2, 2*8, %g2
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ldx [%l7+%g2], %l1
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/* Call _dl_init_next to return the address of an initializer to run. */
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3: call _dl_init_next
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mov %l1, %o0
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brz,pn %o0, 4f
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nop
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jmpl %o0, %o7
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nop
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ba,a 3b
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/* Clear the startup flag. */
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4: sethi %hi(_dl_starting_up), %g2
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or %g2, %lo(_dl_starting_up), %g2
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st %g0, [%l7+%g2]
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/* Pass our finalizer function to the user in %g1
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sethi %hi(_dl_fini), %g1
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or %g1, %lo(_dl_fini), %g1
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ldx [%l7+%g1], %g1
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/* Jump to the user's entry point & undo the allocation of the xtra regs. */
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jmp %l0
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add %sp, 6*8, %sp
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.size _dl_start_user, .-_dl_start_user");
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