/* Machine-dependent ELF dynamic relocation inline functions. x86-64 version.
- Copyright (C) 2001, 2002, 2003 Free Software Foundation, Inc.
+ Copyright (C) 2001-2019 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Andreas Jaeger <aj@suse.de>.
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
#ifndef dl_machine_h
#define dl_machine_h
#define ELF_MACHINE_NAME "x86_64"
#include <sys/param.h>
+#include <sysdep.h>
+#include <tls.h>
+#include <dl-tlsdesc.h>
+#include <cpu-features.c>
/* Return nonzero iff ELF header is compatible with the running host. */
static inline int __attribute__ ((unused))
-elf_machine_matches_host (const Elf64_Ehdr *ehdr)
+elf_machine_matches_host (const ElfW(Ehdr) *ehdr)
{
return ehdr->e_machine == EM_X86_64;
}
/* 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. */
-static inline Elf64_Addr __attribute__ ((unused))
+static inline ElfW(Addr) __attribute__ ((unused))
elf_machine_dynamic (void)
{
- Elf64_Addr addr;
-
- /* This works because we have our GOT address available in the small PIC
- model. */
- addr = (Elf64_Addr) &_DYNAMIC;
-
- return addr;
+ /* This produces an IP-relative reloc which is resolved at link time. */
+ extern const ElfW(Addr) _GLOBAL_OFFSET_TABLE_[] attribute_hidden;
+ return _GLOBAL_OFFSET_TABLE_[0];
}
/* Return the run-time load address of the shared object. */
-static inline Elf64_Addr __attribute__ ((unused))
+static inline ElfW(Addr) __attribute__ ((unused))
elf_machine_load_address (void)
{
- register Elf64_Addr addr, tmp;
-
- /* The easy way is just the same as on x86:
- leaq _dl_start, %0
- leaq _dl_start(%%rip), %1
- subq %0, %1
- but this does not work with binutils since we then have
- a R_X86_64_32S relocation in a shared lib.
-
- Instead we store the address of _dl_start in the data section
- and compare it with the current value that we can get via
- an RIP relative addressing mode. */
-
- asm ("movq 1f(%%rip), %1\n"
- "0:\tleaq _dl_start(%%rip), %0\n\t"
- "subq %1, %0\n\t"
- ".section\t.data\n"
- "1:\t.quad _dl_start\n\t"
- ".previous\n\t"
- : "=r" (addr), "=r" (tmp) : : "cc");
-
- return addr;
+ /* Compute the difference between the runtime address of _DYNAMIC as seen
+ by an IP-relative reference, and the link-time address found in the
+ special unrelocated first GOT entry. */
+ extern ElfW(Dyn) _DYNAMIC[] attribute_hidden;
+ return (ElfW(Addr)) &_DYNAMIC - elf_machine_dynamic ();
}
/* 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 __attribute__ ((unused))
+static inline int __attribute__ ((unused, always_inline))
elf_machine_runtime_setup (struct link_map *l, int lazy, int profile)
{
Elf64_Addr *got;
- extern void _dl_runtime_resolve (Elf64_Word) attribute_hidden;
- extern void _dl_runtime_profile (Elf64_Word) attribute_hidden;
+ extern void _dl_runtime_resolve_fxsave (ElfW(Word)) attribute_hidden;
+ extern void _dl_runtime_resolve_xsave (ElfW(Word)) attribute_hidden;
+ extern void _dl_runtime_resolve_xsavec (ElfW(Word)) attribute_hidden;
+ extern void _dl_runtime_profile_sse (ElfW(Word)) attribute_hidden;
+ extern void _dl_runtime_profile_avx (ElfW(Word)) attribute_hidden;
+ extern void _dl_runtime_profile_avx512 (ElfW(Word)) attribute_hidden;
if (l->l_info[DT_JMPREL] && lazy)
{
/* The GOT entries for functions in the PLT have not yet been filled
in. Their initial contents will arrange when called to push an
offset into the .rel.plt section, push _GLOBAL_OFFSET_TABLE_[1],
- and then jump to _GLOBAL_OFFSET_TABLE[2]. */
+ and then jump to _GLOBAL_OFFSET_TABLE_[2]. */
got = (Elf64_Addr *) D_PTR (l, l_info[DT_PLTGOT]);
/* If a library is prelinked but we have to relocate anyway,
we have to be able to undo the prelinking of .got.plt.
if (got[1])
{
l->l_mach.plt = got[1] + l->l_addr;
- l->l_mach.gotplt = (Elf64_Addr) &got[3];
+ l->l_mach.gotplt = (ElfW(Addr)) &got[3];
}
- got[1] = (Elf64_Addr) l; /* Identify this shared object. */
+ /* Identify this shared object. */
+ *(ElfW(Addr) *) (got + 1) = (ElfW(Addr)) l;
/* The got[2] entry contains the address of a function which gets
called to get the address of a so far unresolved function and
to intercept the calls to collect information. In this case we
don't store the address in the GOT so that all future calls also
end in this function. */
- if (__builtin_expect (profile, 0))
+ if (__glibc_unlikely (profile))
{
- got[2] = (Elf64_Addr) &_dl_runtime_profile;
-
- if (_dl_name_match_p (GL(dl_profile), l))
+ if (HAS_ARCH_FEATURE (AVX512F_Usable))
+ *(ElfW(Addr) *) (got + 2) = (ElfW(Addr)) &_dl_runtime_profile_avx512;
+ else if (HAS_ARCH_FEATURE (AVX_Usable))
+ *(ElfW(Addr) *) (got + 2) = (ElfW(Addr)) &_dl_runtime_profile_avx;
+ else
+ *(ElfW(Addr) *) (got + 2) = (ElfW(Addr)) &_dl_runtime_profile_sse;
+
+ 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. */
GL(dl_profile_map) = l;
}
else
- /* This function will get called to fix up the GOT entry indicated by
- the offset on the stack, and then jump to the resolved address. */
- got[2] = (Elf64_Addr) &_dl_runtime_resolve;
+ {
+ /* This function will get called to fix up the GOT entry
+ indicated by the offset on the stack, and then jump to
+ the resolved address. */
+ if (GLRO(dl_x86_cpu_features).xsave_state_size != 0)
+ *(ElfW(Addr) *) (got + 2)
+ = (HAS_ARCH_FEATURE (XSAVEC_Usable)
+ ? (ElfW(Addr)) &_dl_runtime_resolve_xsavec
+ : (ElfW(Addr)) &_dl_runtime_resolve_xsave);
+ else
+ *(ElfW(Addr) *) (got + 2)
+ = (ElfW(Addr)) &_dl_runtime_resolve_fxsave;
+ }
}
+ if (l->l_info[ADDRIDX (DT_TLSDESC_GOT)] && lazy)
+ *(ElfW(Addr)*)(D_PTR (l, l_info[ADDRIDX (DT_TLSDESC_GOT)]) + l->l_addr)
+ = (ElfW(Addr)) &_dl_tlsdesc_resolve_rela;
+
return lazy;
}
-/* This code is used in dl-runtime.c to call the `fixup' function
- and then redirect to the address it returns. */
-#ifndef PROF
-# define ELF_MACHINE_RUNTIME_TRAMPOLINE asm ("\n\
- .text\n\
- .globl _dl_runtime_resolve\n\
- .type _dl_runtime_resolve, @function\n\
- .align 16\n\
-_dl_runtime_resolve:\n\
- pushq %rax # Preserve registers otherwise clobbered.\n\
- pushq %rcx\n\
- pushq %rdx\n\
- pushq %rsi\n\
- pushq %rdi\n\
- pushq %r8\n\
- pushq %r9\n\
- movq 64(%rsp), %rsi # Copy args pushed by PLT in register.\n\
- movq %rsi,%r11 # Multiply by 24\n\
- addq %r11,%rsi\n\
- addq %r11,%rsi\n\
- shlq $3, %rsi\n\
- movq 56(%rsp), %rdi # %rdi: link_map, %rsi: reloc_offset\n\
- call fixup # Call resolver.\n\
- movq %rax, %r11 # Save return value\n\
- popq %r9 # Get register content back.\n\
- popq %r8\n\
- popq %rdi\n\
- popq %rsi\n\
- popq %rdx\n\
- popq %rcx\n\
- popq %rax\n\
- addq $16,%rsp # Adjust stack\n\
- jmp *%r11 # Jump to function address.\n\
- .size _dl_runtime_resolve, .-_dl_runtime_resolve\n\
-\n\
- .globl _dl_runtime_profile\n\
- .type _dl_runtime_profile, @function\n\
- .align 16\n\
-_dl_runtime_profile:\n\
- pushq %rax # Preserve registers otherwise clobbered.\n\
- pushq %rcx\n\
- pushq %rdx\n\
- pushq %rsi\n\
- pushq %rdi\n\
- pushq %r8\n\
- pushq %r9\n\
- movq 72(%rsp), %rdx # Load return address if needed\n\
- movq 64(%rsp), %rsi # Copy args pushed by PLT in register.\n\
- movq %rsi,%r11 # Multiply by 24\n\
- addq %r11,%rsi\n\
- addq %r11,%rsi\n\
- shlq $3, %rsi\n\
- movq 56(%rsp), %rdi # %rdi: link_map, %rsi: reloc_offset\n\
- call profile_fixup # Call resolver.\n\
- movq %rax, %r11 # Save return value\n\
- popq %r9 # Get register content back.\n\
- popq %r8\n\
- popq %rdi\n\
- popq %rsi\n\
- popq %rdx\n\
- popq %rcx\n\
- popq %rax\n\
- addq $16,%rsp # Adjust stack\n\
- jmp *%r11 # Jump to function address.\n\
- .size _dl_runtime_profile, .-_dl_runtime_profile\n\
- .previous\n\
-");
-#else
-# define ELF_MACHINE_RUNTIME_TRAMPOLINE asm ("\n\
- .text\n\
- .globl _dl_runtime_resolve\n\
- .globl _dl_runtime_profile\n\
- .type _dl_runtime_resolve, @function\n\
- .type _dl_runtime_profile, @function\n\
- .align 16\n\
-_dl_runtime_resolve:\n\
-_dl_runtime_profile:\n\
- pushq %rax # Preserve registers otherwise clobbered.\n\
- pushq %rcx\n\
- pushq %rdx\n\
- pushq %rsi\n\
- pushq %rdi\n\
- pushq %r8\n\
- pushq %r9\n\
- movq 64(%rsp), %rsi # Copy args pushed by PLT in register.\n\
- movq %rsi,%r11 # Multiply by 24\n\
- addq %r11,%rsi\n\
- addq %r11,%rsi\n\
- shlq $3, %rsi\n\
- movq 56(%rsp), %rdi # %rdi: link_map, %rsi: reloc_offset\n\
- call fixup # Call resolver.\n\
- movq %rax, %r11 # Save return value\n\
- popq %r9 # Get register content back.\n\
- popq %r8\n\
- popq %rdi\n\
- popq %rsi\n\
- popq %rdx\n\
- popq %rcx\n\
- popq %rax\n\
- addq $16,%rsp # Adjust stack\n\
- jmp *%r11 # Jump to function address.\n\
- .size _dl_runtime_resolve, .-_dl_runtime_resolve\n\
- .size _dl_runtime_profile, .-_dl_runtime_profile\n\
- .previous\n\
-");
-#endif
-
/* Initial entry point code for the dynamic linker.
The C function `_dl_start' is the real entry point;
its return value is the user program's entry point. */
_dl_start_user:\n\
# Save the user entry point address in %r12.\n\
movq %rax, %r12\n\
- # Store the highest stack address\n\
- movq __libc_stack_end@GOTPCREL(%rip), %rax\n\
- movq %rsp, (%rax)\n\
# See if we were run as a command with the executable file\n\
# name as an extra leading argument.\n\
- movq _dl_skip_args@GOTPCREL(%rip), %rax\n\
- movl (%rax), %eax\n\
+ movl _dl_skip_args(%rip), %eax\n\
# Pop the original argument count.\n\
popq %rdx\n\
# Adjust the stack pointer to skip _dl_skip_args words.\n\
# Call _dl_init (struct link_map *main_map, int argc, char **argv, char **env)\n\
# argc -> rsi\n\
movq %rdx, %rsi\n\
+ # Save %rsp value in %r13.\n\
+ movq %rsp, %r13\n\
+ # And align stack for the _dl_init call. \n\
+ andq $-16, %rsp\n\
# _dl_loaded -> rdi\n\
- movq _rtld_local@GOTPCREL(%rip), %rdi\n\
- movq (%rdi), %rdi\n\
+ movq _rtld_local(%rip), %rdi\n\
# env -> rcx\n\
- leaq 16(%rsp,%rdx,8), %rcx\n\
+ leaq 16(%r13,%rdx,8), %rcx\n\
# argv -> rdx\n\
- leaq 8(%rsp), %rdx\n\
+ leaq 8(%r13), %rdx\n\
+ # Clear %rbp to mark outermost frame obviously even for constructors.\n\
+ xorl %ebp, %ebp\n\
# Call the function to run the initializers.\n\
- call _dl_init_internal@PLT\n\
+ call _dl_init\n\
# Pass our finalizer function to the user in %rdx, as per ELF ABI.\n\
- movq _dl_fini@GOTPCREL(%rip), %rdx\n\
+ leaq _dl_fini(%rip), %rdx\n\
+ # And make sure %rsp points to argc stored on the stack.\n\
+ movq %r13, %rsp\n\
# Jump to the user's entry point.\n\
jmp *%r12\n\
.previous\n\
/* 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_NOCOPY iff TYPE should not be allowed to resolve to one
- of the main executable's symbols, as for a COPY reloc. */
-#if defined USE_TLS && (!defined RTLD_BOOTSTRAP || USE___THREAD)
-# define elf_machine_type_class(type) \
+ 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.
+ ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA iff TYPE describes relocation may
+ against protected data whose address be external due to copy relocation.
+ */
+#define elf_machine_type_class(type) \
((((type) == R_X86_64_JUMP_SLOT \
|| (type) == R_X86_64_DTPMOD64 \
- || (type) == R_X86_64_DTPOFF64 || (type) == R_X86_64_TPOFF64) \
+ || (type) == R_X86_64_DTPOFF64 \
+ || (type) == R_X86_64_TPOFF64 \
+ || (type) == R_X86_64_TLSDESC) \
* ELF_RTYPE_CLASS_PLT) \
- | (((type) == R_X86_64_COPY) * ELF_RTYPE_CLASS_COPY))
-#else
-# define elf_machine_type_class(type) \
- ((((type) == R_X86_64_JUMP_SLOT) * ELF_RTYPE_CLASS_PLT) \
- | (((type) == R_X86_64_COPY) * ELF_RTYPE_CLASS_COPY))
-#endif
+ | (((type) == R_X86_64_COPY) * ELF_RTYPE_CLASS_COPY) \
+ | (((type) == R_X86_64_GLOB_DAT) * ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA))
/* A reloc type used for ld.so cmdline arg lookups to reject PLT entries. */
#define ELF_MACHINE_JMP_SLOT R_X86_64_JUMP_SLOT
-/* The x86-64 never uses Elf64_Rel relocations. */
+/* The relative ifunc relocation. */
+// XXX This is a work-around for a broken linker. Remove!
+#define ELF_MACHINE_IRELATIVE R_X86_64_IRELATIVE
+
+/* The x86-64 never uses Elf64_Rel/Elf32_Rel relocations. */
#define ELF_MACHINE_NO_REL 1
+#define ELF_MACHINE_NO_RELA 0
-/* We define an initialization functions. This is called very early in
+/* We define an initialization function. This is called very early in
_dl_sysdep_start. */
#define DL_PLATFORM_INIT dl_platform_init ()
static inline void __attribute__ ((unused))
dl_platform_init (void)
{
- if (GL(dl_platform) != NULL && *GL(dl_platform) == '\0')
+#if IS_IN (rtld)
+ /* init_cpu_features has been called early from __libc_start_main in
+ static executable. */
+ init_cpu_features (&GLRO(dl_x86_cpu_features));
+#else
+ if (GLRO(dl_platform) != NULL && *GLRO(dl_platform) == '\0')
/* Avoid an empty string which would disturb us. */
- GL(dl_platform) = NULL;
+ GLRO(dl_platform) = NULL;
+#endif
}
-static inline Elf64_Addr
+static inline ElfW(Addr)
elf_machine_fixup_plt (struct link_map *map, lookup_t t,
- const Elf64_Rela *reloc,
- Elf64_Addr *reloc_addr, Elf64_Addr value)
+ const ElfW(Sym) *refsym, const ElfW(Sym) *sym,
+ const ElfW(Rela) *reloc,
+ ElfW(Addr) *reloc_addr, ElfW(Addr) value)
{
return *reloc_addr = value;
}
-/* Return the final value of a plt relocation. On x86-64 the
- JUMP_SLOT relocation ignores the addend. */
-static inline Elf64_Addr
-elf_machine_plt_value (struct link_map *map, const Elf64_Rela *reloc,
- Elf64_Addr value)
+/* Return the final value of a PLT relocation. On x86-64 the
+ JUMP_SLOT relocation ignores the addend. */
+static inline ElfW(Addr)
+elf_machine_plt_value (struct link_map *map, const ElfW(Rela) *reloc,
+ ElfW(Addr) value)
{
return value;
}
+
+/* Names of the architecture-specific auditing callback functions. */
+#define ARCH_LA_PLTENTER x86_64_gnu_pltenter
+#define ARCH_LA_PLTEXIT x86_64_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
-elf_machine_rela (struct link_map *map, const Elf64_Rela *reloc,
- const Elf64_Sym *sym, const struct r_found_version *version,
- Elf64_Addr *const reloc_addr)
+auto inline void
+__attribute__ ((always_inline))
+elf_machine_rela (struct link_map *map, const ElfW(Rela) *reloc,
+ const ElfW(Sym) *sym, const struct r_found_version *version,
+ void *const reloc_addr_arg, int skip_ifunc)
{
- const unsigned long int r_type = ELF64_R_TYPE (reloc->r_info);
+ ElfW(Addr) *const reloc_addr = reloc_addr_arg;
+ const unsigned long int r_type = ELFW(R_TYPE) (reloc->r_info);
-#if !defined RTLD_BOOTSTRAP || !defined HAVE_Z_COMBRELOC
- if (__builtin_expect (r_type == R_X86_64_RELATIVE, 0))
+# if !defined RTLD_BOOTSTRAP || !defined HAVE_Z_COMBRELOC
+ if (__glibc_unlikely (r_type == R_X86_64_RELATIVE))
{
-# if !defined RTLD_BOOTSTRAP && !defined HAVE_Z_COMBRELOC
+# if !defined RTLD_BOOTSTRAP && !defined HAVE_Z_COMBRELOC
/* This is defined in rtld.c, but nowhere in the static libc.a;
make the reference weak so static programs can still link.
This declaration cannot be done when compiling rtld.c
(i.e. #ifdef RTLD_BOOTSTRAP) because rtld.c contains the
common defn for _dl_rtld_map, which is incompatible with a
weak decl in the same file. */
-# ifndef SHARED
+# ifndef SHARED
weak_extern (GL(dl_rtld_map));
-# endif
+# endif
if (map != &GL(dl_rtld_map)) /* Already done in rtld itself. */
-# endif
+# endif
*reloc_addr = map->l_addr + reloc->r_addend;
}
else
-#endif
- if (__builtin_expect (r_type == R_X86_64_NONE, 0))
+# endif
+# if !defined RTLD_BOOTSTRAP
+ /* l_addr + r_addend may be > 0xffffffff and R_X86_64_RELATIVE64
+ relocation updates the whole 64-bit entry. */
+ if (__glibc_unlikely (r_type == R_X86_64_RELATIVE64))
+ *(Elf64_Addr *) reloc_addr = (Elf64_Addr) map->l_addr + reloc->r_addend;
+ else
+# endif
+ if (__glibc_unlikely (r_type == R_X86_64_NONE))
return;
else
{
-#ifndef RTLD_BOOTSTRAP
- const Elf64_Sym *const refsym = sym;
-#endif
-#if defined USE_TLS && !defined RTLD_BOOTSTRAP
+# ifndef RTLD_BOOTSTRAP
+ const ElfW(Sym) *const refsym = sym;
+# endif
struct link_map *sym_map = RESOLVE_MAP (&sym, version, r_type);
- Elf64_Addr value = (sym == NULL ? 0
- : (Elf64_Addr) sym_map->l_addr + sym->st_value);
-#else
- Elf64_Addr value = RESOLVE (&sym, version, r_type);
+ ElfW(Addr) value = SYMBOL_ADDRESS (sym_map, sym, true);
+ if (sym != NULL
+ && __glibc_unlikely (ELFW(ST_TYPE) (sym->st_info) == STT_GNU_IFUNC)
+ && __glibc_likely (sym->st_shndx != SHN_UNDEF)
+ && __glibc_likely (!skip_ifunc))
+ {
# ifndef RTLD_BOOTSTRAP
- if (sym != NULL)
+ if (sym_map != map
+ && sym_map->l_type != lt_executable
+ && !sym_map->l_relocated)
+ {
+ const char *strtab
+ = (const char *) D_PTR (map, l_info[DT_STRTAB]);
+ _dl_error_printf ("\
+%s: Relink `%s' with `%s' for IFUNC symbol `%s'\n",
+ RTLD_PROGNAME, map->l_name,
+ sym_map->l_name,
+ strtab + refsym->st_name);
+ }
# endif
- value += sym->st_value;
-#endif
+ value = ((ElfW(Addr) (*) (void)) value) ();
+ }
-#if defined RTLD_BOOTSTRAP && !USE___THREAD
- assert (r_type == R_X86_64_GLOB_DAT || r_type == R_X86_64_JUMP_SLOT);
- *reloc_addr = value + reloc->r_addend;
-#else
switch (r_type)
{
+# ifndef RTLD_BOOTSTRAP
+# ifdef __ILP32__
+ case R_X86_64_SIZE64:
+ /* Set to symbol size plus addend. */
+ *(Elf64_Addr *) (uintptr_t) reloc_addr
+ = (Elf64_Addr) sym->st_size + reloc->r_addend;
+ break;
+
+ case R_X86_64_SIZE32:
+# else
+ case R_X86_64_SIZE64:
+# endif
+ /* Set to symbol size plus addend. */
+ value = sym->st_size;
+# endif
+ /* Fall through. */
case R_X86_64_GLOB_DAT:
case R_X86_64_JUMP_SLOT:
*reloc_addr = value + reloc->r_addend;
break;
-#ifdef USE_TLS
+# ifndef RESOLVE_CONFLICT_FIND_MAP
case R_X86_64_DTPMOD64:
-# ifdef RTLD_BOOTSTRAP
+# ifdef RTLD_BOOTSTRAP
/* During startup the dynamic linker is always the module
with index 1.
XXX If this relocation is necessary move before RESOLVE
call. */
*reloc_addr = 1;
-# else
+# else
/* Get the information from the link map returned by the
resolve function. */
if (sym_map != NULL)
*reloc_addr = sym_map->l_tls_modid;
-# endif
+# endif
break;
case R_X86_64_DTPOFF64:
-# ifndef RTLD_BOOTSTRAP
+# ifndef RTLD_BOOTSTRAP
/* During relocation all TLS symbols are defined and used.
Therefore the offset is already correct. */
if (sym != NULL)
- *reloc_addr = sym->st_value + reloc->r_addend;
-# endif
+ {
+ value = sym->st_value + reloc->r_addend;
+# ifdef __ILP32__
+ /* This relocation type computes a signed offset that is
+ usually negative. The symbol and addend values are 32
+ bits but the GOT entry is 64 bits wide and the whole
+ 64-bit entry is used as a signed quantity, so we need
+ to sign-extend the computed value to 64 bits. */
+ *(Elf64_Sxword *) reloc_addr = (Elf64_Sxword) (Elf32_Sword) value;
+# else
+ *reloc_addr = value;
+# endif
+ }
+# endif
break;
+ case R_X86_64_TLSDESC:
+ {
+ struct tlsdesc volatile *td =
+ (struct tlsdesc volatile *)reloc_addr;
+
+# ifndef RTLD_BOOTSTRAP
+ if (! sym)
+ {
+ td->arg = (void*)reloc->r_addend;
+ td->entry = _dl_tlsdesc_undefweak;
+ }
+ else
+# endif
+ {
+# ifndef RTLD_BOOTSTRAP
+# ifndef SHARED
+ CHECK_STATIC_TLS (map, sym_map);
+# else
+ if (!TRY_STATIC_TLS (map, sym_map))
+ {
+ td->arg = _dl_make_tlsdesc_dynamic
+ (sym_map, sym->st_value + reloc->r_addend);
+ td->entry = _dl_tlsdesc_dynamic;
+ }
+ else
+# endif
+# endif
+ {
+ td->arg = (void*)(sym->st_value - sym_map->l_tls_offset
+ + reloc->r_addend);
+ td->entry = _dl_tlsdesc_return;
+ }
+ }
+ break;
+ }
case R_X86_64_TPOFF64:
/* The offset is negative, forward from the thread pointer. */
-# ifndef RTLD_BOOTSTRAP
+# ifndef RTLD_BOOTSTRAP
if (sym != NULL)
-# endif
+# endif
{
-# ifndef RTLD_BOOTSTRAP
+# ifndef RTLD_BOOTSTRAP
CHECK_STATIC_TLS (map, sym_map);
-# endif
+# endif
/* We know the offset of the object the symbol is contained in.
It is a negative value which will be added to the
thread pointer. */
- *reloc_addr = (sym->st_value + reloc->r_addend
- - sym_map->l_tls_offset);
+ value = (sym->st_value + reloc->r_addend
+ - sym_map->l_tls_offset);
+# ifdef __ILP32__
+ /* The symbol and addend values are 32 bits but the GOT
+ entry is 64 bits wide and the whole 64-bit entry is used
+ as a signed quantity, so we need to sign-extend the
+ computed value to 64 bits. */
+ *(Elf64_Sxword *) reloc_addr = (Elf64_Sxword) (Elf32_Sword) value;
+# else
+ *reloc_addr = value;
+# endif
}
break;
-#endif /* use TLS */
+# endif
-#ifndef RTLD_BOOTSTRAP
+# ifndef RTLD_BOOTSTRAP
case R_X86_64_64:
- *reloc_addr = value + reloc->r_addend;
+ /* value + r_addend may be > 0xffffffff and R_X86_64_64
+ relocation updates the whole 64-bit entry. */
+ *(Elf64_Addr *) reloc_addr = (Elf64_Addr) value + reloc->r_addend;
break;
+# ifndef __ILP32__
+ case R_X86_64_SIZE32:
+ /* Set to symbol size plus addend. */
+ value = sym->st_size;
+# endif
+ /* Fall through. */
case R_X86_64_32:
- *(unsigned int *) reloc_addr = value + reloc->r_addend;
- if (value + reloc->r_addend > UINT_MAX)
+ value += reloc->r_addend;
+ *(unsigned int *) reloc_addr = value;
+
+ const char *fmt;
+ if (__glibc_unlikely (value > UINT_MAX))
{
const char *strtab;
+ fmt = "\
+%s: Symbol `%s' causes overflow in R_X86_64_32 relocation\n";
+# ifndef RESOLVE_CONFLICT_FIND_MAP
+ print_err:
+# endif
strtab = (const char *) D_PTR (map, l_info[DT_STRTAB]);
- _dl_error_printf ("\
-%s: Symbol `%s' causes overflow in R_X86_64_32 relocation\n",
- rtld_progname ?: "<program name unknown>",
- strtab + refsym->st_name);
+ _dl_error_printf (fmt, RTLD_PROGNAME, strtab + refsym->st_name);
}
break;
+# ifndef RESOLVE_CONFLICT_FIND_MAP
+ /* Not needed for dl-conflict.c. */
case R_X86_64_PC32:
- *(unsigned int *) reloc_addr = value + reloc->r_addend
- - (Elf64_Addr) reloc_addr;
- if (value + reloc->r_addend - (Elf64_Addr) reloc_addr
- != (int)(value + reloc->r_addend - (Elf64_Addr) reloc_addr))
+ value += reloc->r_addend - (ElfW(Addr)) reloc_addr;
+ *(unsigned int *) reloc_addr = value;
+ if (__glibc_unlikely (value != (int) value))
{
- const char *strtab;
-
- strtab = (const char *) D_PTR (map, l_info[DT_STRTAB]);
-
- _dl_error_printf ("\
-%s: Symbol `%s' causes overflow in R_X86_64_PC32 relocation\n",
- rtld_progname ?: "<program name unknown>",
- strtab + refsym->st_name);
+ fmt = "\
+%s: Symbol `%s' causes overflow in R_X86_64_PC32 relocation\n";
+ goto print_err;
}
break;
case R_X86_64_COPY:
/* This can happen in trace mode if an object could not be
found. */
break;
- if (__builtin_expect (sym->st_size > refsym->st_size, 0)
- || (__builtin_expect (sym->st_size < refsym->st_size, 0)
- && GL(dl_verbose)))
+ memcpy (reloc_addr_arg, (void *) value,
+ MIN (sym->st_size, refsym->st_size));
+ if (__glibc_unlikely (sym->st_size > refsym->st_size)
+ || (__glibc_unlikely (sym->st_size < refsym->st_size)
+ && GLRO(dl_verbose)))
{
- const char *strtab;
-
- strtab = (const char *) 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 ?: "<program name unknown>",
- strtab + refsym->st_name);
+ fmt = "\
+%s: Symbol `%s' has different size in shared object, consider re-linking\n";
+ goto print_err;
}
- memcpy (reloc_addr, (void *) value, MIN (sym->st_size,
- refsym->st_size));
+ break;
+# endif
+ case R_X86_64_IRELATIVE:
+ value = map->l_addr + reloc->r_addend;
+ value = ((ElfW(Addr) (*) (void)) value) ();
+ *reloc_addr = value;
break;
default:
_dl_reloc_bad_type (map, r_type, 0);
break;
-#endif
+# endif
}
-#endif
}
}
-static inline void
-elf_machine_rela_relative (Elf64_Addr l_addr, const Elf64_Rela *reloc,
- Elf64_Addr *const reloc_addr)
+auto inline void
+__attribute ((always_inline))
+elf_machine_rela_relative (ElfW(Addr) l_addr, const ElfW(Rela) *reloc,
+ void *const reloc_addr_arg)
{
- assert (ELF64_R_TYPE (reloc->r_info) == R_X86_64_RELATIVE);
- *reloc_addr = l_addr + reloc->r_addend;
+ ElfW(Addr) *const reloc_addr = reloc_addr_arg;
+#if !defined RTLD_BOOTSTRAP
+ /* l_addr + r_addend may be > 0xffffffff and R_X86_64_RELATIVE64
+ relocation updates the whole 64-bit entry. */
+ if (__glibc_unlikely (ELFW(R_TYPE) (reloc->r_info) == R_X86_64_RELATIVE64))
+ *(Elf64_Addr *) reloc_addr = (Elf64_Addr) l_addr + reloc->r_addend;
+ else
+#endif
+ {
+ assert (ELFW(R_TYPE) (reloc->r_info) == R_X86_64_RELATIVE);
+ *reloc_addr = l_addr + reloc->r_addend;
+ }
}
-static inline void
+auto inline void
+__attribute ((always_inline))
elf_machine_lazy_rel (struct link_map *map,
- Elf64_Addr l_addr, const Elf64_Rela *reloc)
+ ElfW(Addr) l_addr, const ElfW(Rela) *reloc,
+ int skip_ifunc)
{
- Elf64_Addr *const reloc_addr = (void *) (l_addr + reloc->r_offset);
- const unsigned long int r_type = ELF64_R_TYPE (reloc->r_info);
+ ElfW(Addr) *const reloc_addr = (void *) (l_addr + reloc->r_offset);
+ const unsigned long int r_type = ELFW(R_TYPE) (reloc->r_info);
/* Check for unexpected PLT reloc type. */
- if (__builtin_expect (r_type == R_X86_64_JUMP_SLOT, 1))
+ if (__glibc_likely (r_type == R_X86_64_JUMP_SLOT))
{
- if (__builtin_expect (map->l_mach.plt, 0) == 0)
+ /* Prelink has been deprecated. */
+ if (__glibc_likely (map->l_mach.plt == 0))
*reloc_addr += l_addr;
else
*reloc_addr =
map->l_mach.plt
- + (((Elf64_Addr) reloc_addr) - map->l_mach.gotplt) * 2;
+ + (((ElfW(Addr)) reloc_addr) - map->l_mach.gotplt) * 2;
+ }
+ else if (__glibc_likely (r_type == R_X86_64_TLSDESC))
+ {
+ struct tlsdesc volatile * __attribute__((__unused__)) td =
+ (struct tlsdesc volatile *)reloc_addr;
+
+ td->arg = (void*)reloc;
+ td->entry = (void*)(D_PTR (map, l_info[ADDRIDX (DT_TLSDESC_PLT)])
+ + map->l_addr);
+ }
+ else if (__glibc_unlikely (r_type == R_X86_64_IRELATIVE))
+ {
+ ElfW(Addr) value = map->l_addr + reloc->r_addend;
+ if (__glibc_likely (!skip_ifunc))
+ value = ((ElfW(Addr) (*) (void)) value) ();
+ *reloc_addr = value;
}
else
_dl_reloc_bad_type (map, r_type, 1);
}
-#endif /* RESOLVE */
+#endif /* RESOLVE_MAP */
projects / thirdparty / glibc.git / blobdiff