/* Machine-dependent ELF dynamic relocation inline functions. m68k version.
- Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc.
+ Copyright (C) 1996-2019 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Library General Public License as
- published by the Free Software Foundation; either version 2 of the
- License, or (at your option) any later version.
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Library General Public License for more details.
+ Lesser General Public License for more details.
- You should have received a copy of the GNU Library General Public
- License along with the GNU C Library; see the file COPYING.LIB. If
- not, write to the Free Software Foundation, Inc.,
- 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library. If not, see
+ <http://www.gnu.org/licenses/>. */
#ifndef dl_machine_h
#define dl_machine_h
#define ELF_MACHINE_NAME "m68k"
#include <sys/param.h>
+#include <sysdep.h>
+#include <dl-tls.h>
-#include <assert.h>
-
-/* Return nonzero iff E_MACHINE is compatible with the running host. */
+/* Return nonzero iff ELF header is compatible with the running host. */
static inline int
-elf_machine_matches_host (Elf32_Half e_machine)
+elf_machine_matches_host (const Elf32_Ehdr *ehdr)
{
- switch (e_machine)
- {
- case EM_68K:
- return 1;
- default:
- return 0;
- }
+ return ehdr->e_machine == EM_68K;
}
-/* Return the link-time address of _DYNAMIC. Conveniently, this is the
- first element of the GOT. This must be inlined in a function which
- uses global data. */
+/* Return the link-time address of _DYNAMIC.
+ This must be inlined in a function which uses global data. */
static inline Elf32_Addr
elf_machine_dynamic (void)
{
- register Elf32_Addr *got asm ("%a5");
- return *got;
+ Elf32_Addr addr;
+
+ asm ("move.l _DYNAMIC@GOT.w(%%a5), %0"
+ : "=a" (addr));
+ return addr;
}
elf_machine_load_address (void)
{
Elf32_Addr addr;
- asm ("lea _dl_start(%%pc), %0\n\t"
+#ifdef SHARED
+ asm (PCREL_OP ("lea", "_dl_start", "%0", "%0", "%%pc") "\n\t"
"sub.l _dl_start@GOT.w(%%a5), %0"
: "=a" (addr));
+#else
+ asm (PCREL_OP ("lea", "_dl_relocate_static_pie", "%0", "%0", "%%pc") "\n\t"
+ "sub.l _dl_relocate_static_pie@GOT.w(%%a5), %0"
+ : "=a" (addr));
+#endif
return addr;
}
/* Set up the loaded object described by L so its unrelocated PLT
entries will jump to the on-demand fixup code in dl-runtime.c. */
-static inline int
+static inline int __attribute__ ((always_inline))
elf_machine_runtime_setup (struct link_map *l, int lazy, int profile)
{
Elf32_Addr *got;
to push an offset into the .rela.plt section, push
_GLOBAL_OFFSET_TABLE_[1], and then jump to
_GLOBAL_OFFSET_TABLE_[2]. */
- got = (Elf32_Addr *) (l->l_addr + l->l_info[DT_PLTGOT]->d_un.d_ptr);
+ got = (Elf32_Addr *) D_PTR (l, l_info[DT_PLTGOT]);
got[1] = (Elf32_Addr) l; /* Identify this shared object. */
/* The got[2] entry contains the address of a function which gets
{
got[2] = (Elf32_Addr) &_dl_runtime_profile;
- if (_dl_name_match_p (_dl_profile, l))
+ if (GLRO(dl_profile) != NULL
+ && _dl_name_match_p (GLRO(dl_profile), l))
{
/* This is the object we are looking for. Say that we really
want profiling and the timers are started. */
- _dl_profile_map = l;
+ GL(dl_profile_map) = l;
}
}
else
return lazy;
}
-/* This code is used in dl-runtime.c to call the `fixup' function
- and then redirect to the address it returns. */
-#define TRAMPOLINE_TEMPLATE(tramp_name, fixup_name) \
-"| Trampoline for " #fixup_name "
- .globl " #tramp_name "
- .type " #tramp_name ", @function
-" #tramp_name ":
- | Save %a0 (struct return address) and %a1.
- move.l %a0, -(%sp)
- move.l %a1, -(%sp)
- | Call the real address resolver.
- jbsr " #fixup_name "
- | Restore register %a0 and %a1.
- move.l (%sp)+, %a1
- move.l (%sp)+, %a0
- | Pop parameters
- addq.l #8, %sp
- | Call real function.
- jmp (%d0)
- .size " #tramp_name ", . - " #tramp_name "\n"
-#ifndef PROF
-#define ELF_MACHINE_RUNTIME_TRAMPOLINE \
-asm (TRAMPOLINE_TEMPLATE (_dl_runtime_resolve, fixup) \
- TRAMPOLINE_TEMPLATE (_dl_runtime_profile, profile_fixup));
-#else
-#define ELF_MACHINE_RUNTIME_TRAMPOLINE \
-asm (TRAMPOLINE_TEMPLATE (_dl_runtime_resolve, fixup) \
- ".globl _dl_runtime_profile\n" \
- ".set _dl_runtime_profile, _dl_runtime_resolve");
-#endif
#define ELF_MACHINE_RUNTIME_FIXUP_ARGS long int save_a0, long int save_a1
+#define ELF_MACHINE_RUNTIME_FIXUP_PARAMS save_a0, save_a1
/* Mask identifying addresses reserved for the user program,
its return value is the user program's entry point. */
#define RTLD_START asm ("\
- .text
- .globl _start
- .type _start,@function
-_start:
- move.l %sp, -(%sp)
- jbsr _dl_start
- addq.l #4, %sp
-
- .globl _dl_start_user
- .type _dl_start_user,@function
-_dl_start_user:
- | Save the user entry point address in %a4.
- move.l %d0, %a4
- | Point %a5 at the GOT.
- lea _GLOBAL_OFFSET_TABLE_@GOTPC(%pc), %a5
- | Remember the highest stack address.
- move.l %sp, ([__libc_stack_end@GOT.w, %a5])
- | See if we were run as a command with the executable file
- | name as an extra leading argument.
- move.l ([_dl_skip_args@GOT.w, %a5]), %d0
- jeq 0f
- | Pop the original argument count
- move.l (%sp)+, %d1
- | Subtract _dl_skip_args from it.
- sub.l %d0, %d1
- | Adjust the stack pointer to skip _dl_skip_args words.
- lea (%sp, %d0*4), %sp
- | Push back the modified argument count.
- move.l %d1, -(%sp)
-0: | Push _dl_default_scope[2] as argument in _dl_init_next call below.
- move.l ([_dl_default_scope@GOT.w, %a5], 8), %d2
-0: move.l %d2, -(%sp)
- | Call _dl_init_next to return the address of an initializer
- | function to run.
- bsr.l _dl_init_next@PLTPC
- add.l #4, %sp | Pop argument.
- | Check for zero return, when out of initializers.
- tst.l %d0
- jeq 1f
- | Call the shared object initializer function.
- | NOTE: We depend only on the registers (%d2, %a4 and %a5)
- | and the return address pushed by this call;
- | the initializer is called with the stack just
- | as it appears on entry, and it is free to move
- | the stack around, as long as it winds up jumping to
- | the return address on the top of the stack.
- move.l %d0, %a0
- jsr (%a0)
- | Loop to call _dl_init_next for the next initializer.
- jra 0b
-1: | Clear the startup flag.
- clr.l _dl_starting_up@GOT.w(%a5)
- | Pass our finalizer function to the user in %a1.
- move.l _dl_fini@GOT.w(%a5), %a1
- | Initialize %fp with the stack pointer.
- move.l %sp, %fp
- | Jump to the user's entry point.
- jmp (%a4)
- .size _dl_start_user, . - _dl_start_user
+ .text\n\
+ .globl _start\n\
+ .type _start,@function\n\
+_start:\n\
+ sub.l %fp, %fp\n\
+ move.l %sp, -(%sp)\n\
+ jbsr _dl_start\n\
+ addq.l #4, %sp\n\
+ /* FALLTHRU */\n\
+\n\
+ .globl _dl_start_user\n\
+ .type _dl_start_user,@function\n\
+_dl_start_user:\n\
+ | Save the user entry point address in %a4.\n\
+ move.l %d0, %a4\n\
+ | See if we were run as a command with the executable file\n\
+ | name as an extra leading argument.\n\
+ " PCREL_OP ("move.l", "_dl_skip_args", "%d0", "%d0", "%pc") "\n\
+ | Pop the original argument count\n\
+ move.l (%sp)+, %d1\n\
+ | Subtract _dl_skip_args from it.\n\
+ sub.l %d0, %d1\n\
+ | Adjust the stack pointer to skip _dl_skip_args words.\n\
+ lea (%sp, %d0*4), %sp\n\
+ | Push back the modified argument count.\n\
+ move.l %d1, -(%sp)\n\
+ # Call _dl_init (struct link_map *main_map, int argc, char **argv, char **env)\n\
+ pea 8(%sp, %d1*4)\n\
+ pea 8(%sp)\n\
+ move.l %d1, -(%sp)\n\
+ " PCREL_OP ("move.l", "_rtld_local", "-(%sp)", "%d0", "%pc") "\n\
+ jbsr _dl_init\n\
+ addq.l #8, %sp\n\
+ addq.l #8, %sp\n\
+ | Pass our finalizer function to the user in %a1.\n\
+ " PCREL_OP ("lea", "_dl_fini", "%a1", "%a1", "%pc") "\n\
+ | Initialize %fp with the stack pointer.\n\
+ move.l %sp, %fp\n\
+ | Jump to the user's entry point.\n\
+ jmp (%a4)\n\
+ .size _dl_start_user, . - _dl_start_user\n\
.previous");
-/* Nonzero iff TYPE describes a relocation that should
- skip the executable when looking up the symbol value. */
-#define elf_machine_lookup_noexec_p(type) ((type) == R_68K_COPY)
-
-/* Nonzero iff TYPE describes relocation of a PLT entry, so
- PLT entries should not be allowed to define the value. */
-#define elf_machine_lookup_noplt_p(type) ((type) == R_68K_JMP_SLOT)
+/* ELF_RTYPE_CLASS_PLT iff TYPE describes relocation of a PLT entry or
+ TLS variable, so undefined references should not be allowed to
+ define the value.
+ ELF_RTYPE_CLASS_COPY 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_68K_JMP_SLOT \
+ || (type) == R_68K_TLS_DTPMOD32 \
+ || (type) == R_68K_TLS_DTPREL32 \
+ || (type) == R_68K_TLS_TPREL32) * ELF_RTYPE_CLASS_PLT) \
+ | (((type) == R_68K_COPY) * ELF_RTYPE_CLASS_COPY))
/* A reloc type used for ld.so cmdline arg lookups to reject PLT entries. */
#define ELF_MACHINE_JMP_SLOT R_68K_JMP_SLOT
/* The m68k never uses Elf32_Rel relocations. */
#define ELF_MACHINE_NO_REL 1
+#define ELF_MACHINE_NO_RELA 0
-static inline void
-elf_machine_fixup_plt (struct link_map *map, const Elf32_Rela *reloc,
+static inline Elf32_Addr
+elf_machine_fixup_plt (struct link_map *map, lookup_t t,
+ const ElfW(Sym) *refsym, const ElfW(Sym) *sym,
+ const Elf32_Rela *reloc,
Elf32_Addr *reloc_addr, Elf32_Addr value)
{
- *reloc_addr = value;
+ return *reloc_addr = value;
}
/* Return the final value of a plt relocation. On the m68k the JMP_SLOT
return value;
}
+/* Names of the architecture-specific auditing callback functions. */
+#define ARCH_LA_PLTENTER m68k_gnu_pltenter
+#define ARCH_LA_PLTEXIT m68k_gnu_pltexit
+
#endif /* !dl_machine_h */
-#ifdef RESOLVE
+#ifdef RESOLVE_MAP
/* Perform the relocation specified by RELOC and SYM (which is fully resolved).
MAP is the object containing the reloc. */
-static inline void
+auto inline void __attribute__ ((unused, always_inline))
elf_machine_rela (struct link_map *map, const Elf32_Rela *reloc,
const Elf32_Sym *sym, const struct r_found_version *version,
- Elf32_Addr *const reloc_addr)
+ void *const reloc_addr_arg, int skip_ifunc)
{
- if (ELF32_R_TYPE (reloc->r_info) == R_68K_RELATIVE)
+ Elf32_Addr *const reloc_addr = reloc_addr_arg;
+ const unsigned int r_type = ELF32_R_TYPE (reloc->r_info);
+
+ if (__builtin_expect (r_type == R_68K_RELATIVE, 0))
*reloc_addr = map->l_addr + reloc->r_addend;
else
{
const Elf32_Sym *const refsym = sym;
- Elf32_Addr value = RESOLVE (&sym, version, ELF32_R_TYPE (reloc->r_info));
- if (sym)
- value += sym->st_value;
+ struct link_map *sym_map = RESOLVE_MAP (&sym, version, r_type);
+ Elf32_Addr value = SYMBOL_ADDRESS (sym_map, sym, true);
- switch (ELF32_R_TYPE (reloc->r_info))
+ switch (r_type)
{
case R_68K_COPY:
if (sym == NULL)
found. */
break;
if (sym->st_size > refsym->st_size
- || (_dl_verbose && sym->st_size < refsym->st_size))
+ || (sym->st_size < refsym->st_size && GLRO(dl_verbose)))
{
- extern char **_dl_argv;
const char *strtab;
- strtab = ((void *) map->l_addr
- + map->l_info[DT_STRTAB]->d_un.d_ptr);
- _dl_sysdep_error (_dl_argv[0] ?: "<program name unknown>",
- ": Symbol `", strtab + refsym->st_name,
- "' has different size in shared object, "
- "consider re-linking\n", NULL);
+ strtab = (const void *) D_PTR (map, l_info[DT_STRTAB]);
+ _dl_error_printf ("\
+%s: Symbol `%s' has different size in shared object, consider re-linking\n",
+ RTLD_PROGNAME, strtab + refsym->st_name);
}
- memcpy (reloc_addr, (void *) value, MIN (sym->st_size,
- refsym->st_size));
+ memcpy (reloc_addr_arg, (void *) value,
+ MIN (sym->st_size, refsym->st_size));
break;
case R_68K_GLOB_DAT:
case R_68K_JMP_SLOT:
case R_68K_PC32:
*reloc_addr = value + reloc->r_addend - (Elf32_Addr) reloc_addr;
break;
+#ifndef RTLD_BOOTSTRAP
+ case R_68K_TLS_DTPMOD32:
+ /* Get the information from the link map returned by the
+ resolv function. */
+ if (sym_map != NULL)
+ *reloc_addr = sym_map->l_tls_modid;
+ break;
+ case R_68K_TLS_DTPREL32:
+ if (sym != NULL)
+ *reloc_addr = TLS_DTPREL_VALUE (sym, reloc);
+ break;
+ case R_68K_TLS_TPREL32:
+ if (sym != NULL)
+ {
+ CHECK_STATIC_TLS (map, sym_map);
+ *reloc_addr = TLS_TPREL_VALUE (sym_map, sym, reloc);
+ }
+ break;
+#endif /* !RTLD_BOOTSTRAP */
case R_68K_NONE: /* Alright, Wilbur. */
break;
default:
- assert (! "unexpected dynamic reloc type");
+ _dl_reloc_bad_type (map, r_type, 0);
break;
}
}
}
-static inline void
-elf_machine_lazy_rel (Elf32_Addr l_addr, const Elf32_Rela *reloc)
+auto inline void __attribute__ ((unused, always_inline))
+elf_machine_rela_relative (Elf32_Addr l_addr, const Elf32_Rela *reloc,
+ void *const reloc_addr_arg)
+{
+ Elf32_Addr *const reloc_addr = reloc_addr_arg;
+ *reloc_addr = l_addr + reloc->r_addend;
+}
+
+auto inline void __attribute__ ((unused, always_inline))
+elf_machine_lazy_rel (struct link_map *map,
+ Elf32_Addr l_addr, const Elf32_Rela *reloc,
+ int skip_ifunc)
{
Elf32_Addr *const reloc_addr = (void *) (l_addr + reloc->r_offset);
- switch (ELF32_R_TYPE (reloc->r_info))
- {
- case R_68K_JMP_SLOT:
- *reloc_addr += l_addr;
- break;
- default:
- assert (! "unexpected PLT reloc type");
- break;
- }
+ if (ELF32_R_TYPE (reloc->r_info) == R_68K_JMP_SLOT)
+ *reloc_addr += l_addr;
+ else
+ _dl_reloc_bad_type (map, ELF32_R_TYPE (reloc->r_info), 1);
}
-#endif /* RESOLVE */
+#endif /* RESOLVE_MAP */
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