&& ((indx = r_type - R_386_vt_offset) - R_386_ext2
>= R_386_vt - R_386_ext2))
{
- (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
- abfd, (int) r_type);
+ _bfd_error_handler (_("%B: invalid relocation type %d"),
+ abfd, (int) r_type);
indx = R_386_NONE;
}
/* PR 17512: file: 0f67f69d. */
/* Symbol has non-GOT/non-PLT relocations in text sections. */
unsigned int has_non_got_reloc : 1;
+ /* 0: symbol isn't ___tls_get_addr.
+ 1: symbol is ___tls_get_addr.
+ 2: symbol is unknown. */
+ unsigned int tls_get_addr : 2;
+
/* Reference count of C/C++ function pointer relocations in read-write
section which can be resolved at run-time. */
bfd_signed_vma func_pointer_refcount;
eh->gotoff_ref = 0;
eh->has_got_reloc = 0;
eh->has_non_got_reloc = 0;
+ eh->tls_get_addr = 2;
eh->func_pointer_refcount = 0;
eh->plt_got.offset = (bfd_vma) -1;
eh->tlsdesc_got = (bfd_vma) -1;
if (htab == NULL)
return FALSE;
+ /* Set the contents of the .interp section to the interpreter. */
+ if (bfd_link_executable (info) && !info->nointerp)
+ {
+ asection *s = bfd_get_linker_section (dynobj, ".interp");
+ if (s == NULL)
+ abort ();
+ s->size = sizeof ELF_DYNAMIC_INTERPRETER;
+ s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
+ htab->interp = s;
+ }
+
htab->sdynbss = bfd_get_linker_section (dynobj, ".dynbss");
if (!htab->sdynbss)
abort ();
from R_TYPE. */
static bfd_boolean
-elf_i386_check_tls_transition (bfd *abfd, asection *sec,
+elf_i386_check_tls_transition (asection *sec,
bfd_byte *contents,
Elf_Internal_Shdr *symtab_hdr,
struct elf_link_hash_entry **sym_hashes,
const Elf_Internal_Rela *rel,
const Elf_Internal_Rela *relend)
{
- unsigned int val, type;
+ unsigned int val, type, reg;
unsigned long r_symndx;
struct elf_link_hash_entry *h;
bfd_vma offset;
-
- /* Get the section contents. */
- if (contents == NULL)
- {
- if (elf_section_data (sec)->this_hdr.contents != NULL)
- contents = elf_section_data (sec)->this_hdr.contents;
- else
- {
- /* FIXME: How to better handle error condition? */
- if (!bfd_malloc_and_get_section (abfd, sec, &contents))
- return FALSE;
-
- /* Cache the section contents for elf_link_input_bfd. */
- elf_section_data (sec)->this_hdr.contents = contents;
- }
- }
+ bfd_byte *call;
+ bfd_boolean indirect_call, tls_get_addr;
offset = rel->r_offset;
switch (r_type)
if (offset < 2 || (rel + 1) >= relend)
return FALSE;
- type = bfd_get_8 (abfd, contents + offset - 2);
+ indirect_call = FALSE;
+ call = contents + offset + 4;
+ val = *(call - 5);
+ type = *(call - 6);
if (r_type == R_386_TLS_GD)
{
/* Check transition from GD access model. Only
- leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr
- leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop
+ leal foo@tlsgd(,%ebx,1), %eax
+ call ___tls_get_addr@PLT
+ or
+ leal foo@tlsgd(%ebx) %eax
+ call ___tls_get_addr@PLT
+ nop
+ or
+ leal foo@tlsgd(%reg), %eax
+ call *___tls_get_addr@GOT(%reg)
+ which may be converted to
+ addr32 call ___tls_get_addr
can transit to different access model. */
- if ((offset + 10) > sec->size ||
- (type != 0x8d && type != 0x04))
+ if ((offset + 10) > sec->size
+ || (type != 0x8d && type != 0x04))
return FALSE;
- val = bfd_get_8 (abfd, contents + offset - 1);
if (type == 0x04)
{
- /* leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr */
+ /* leal foo@tlsgd(,%ebx,1), %eax
+ call ___tls_get_addr@PLT */
if (offset < 3)
return FALSE;
- if (bfd_get_8 (abfd, contents + offset - 3) != 0x8d)
- return FALSE;
-
- if ((val & 0xc7) != 0x05 || val == (4 << 3))
+ if (*(call - 7) != 0x8d
+ || val != 0x1d
+ || call[0] != 0xe8)
return FALSE;
}
else
{
- /* leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop */
- if ((val & 0xf8) != 0x80 || (val & 7) == 4)
+ /* This must be
+ leal foo@tlsgd(%ebx), %eax
+ call ___tls_get_addr@PLT
+ nop
+ or
+ leal foo@tlsgd(%reg), %eax
+ call *___tls_get_addr@GOT(%reg)
+ which may be converted to
+ addr32 call ___tls_get_addr
+
+ %eax can't be used as the GOT base register since it
+ is used to pass parameter to ___tls_get_addr. */
+ reg = val & 7;
+ if ((val & 0xf8) != 0x80 || reg == 4 || reg == 0)
return FALSE;
- if (bfd_get_8 (abfd, contents + offset + 9) != 0x90)
+ indirect_call = call[0] == 0xff;
+ if (!(reg == 3 && call[0] == 0xe8 && call[5] == 0x90)
+ && !(call[0] == 0x67 && call[1] == 0xe8)
+ && !(indirect_call
+ && (call[1] & 0xf8) == 0x90
+ && (call[1] & 0x7) == reg))
return FALSE;
}
}
else
{
/* Check transition from LD access model. Only
- leal foo@tlsgd(%reg), %eax; call ___tls_get_addr
+ leal foo@tlsldm(%ebx), %eax
+ call ___tls_get_addr@PLT
+ or
+ leal foo@tlsldm(%reg), %eax
+ call *___tls_get_addr@GOT(%reg)
+ which may be converted to
+ addr32 call ___tls_get_addr
can transit to different access model. */
if (type != 0x8d || (offset + 9) > sec->size)
return FALSE;
- val = bfd_get_8 (abfd, contents + offset - 1);
- if ((val & 0xf8) != 0x80 || (val & 7) == 4)
+ /* %eax can't be used as the GOT base register since it is
+ used to pass parameter to ___tls_get_addr. */
+ reg = val & 7;
+ if ((val & 0xf8) != 0x80 || reg == 4 || reg == 0)
return FALSE;
- }
- if (bfd_get_8 (abfd, contents + offset + 4) != 0xe8)
- return FALSE;
+ indirect_call = call[0] == 0xff;
+ if (!(reg == 3 && call[0] == 0xe8)
+ && !(call[0] == 0x67 && call[1] == 0xe8)
+ && !(indirect_call
+ && (call[1] & 0xf8) == 0x90
+ && (call[1] & 0x7) == reg))
+ return FALSE;
+ }
r_symndx = ELF32_R_SYM (rel[1].r_info);
if (r_symndx < symtab_hdr->sh_info)
return FALSE;
+ tls_get_addr = FALSE;
h = sym_hashes[r_symndx - symtab_hdr->sh_info];
- /* Use strncmp to check ___tls_get_addr since ___tls_get_addr
- may be versioned. */
- return (h != NULL
- && h->root.root.string != NULL
- && (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
- || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32)
- && (strncmp (h->root.root.string, "___tls_get_addr",
- 15) == 0));
+ if (h != NULL && h->root.root.string != NULL)
+ {
+ struct elf_i386_link_hash_entry *eh
+ = (struct elf_i386_link_hash_entry *) h;
+ tls_get_addr = eh->tls_get_addr == 1;
+ if (eh->tls_get_addr > 1)
+ {
+ /* Use strncmp to check ___tls_get_addr since
+ ___tls_get_addr may be versioned. */
+ if (strncmp (h->root.root.string, "___tls_get_addr", 15)
+ == 0)
+ {
+ eh->tls_get_addr = 1;
+ tls_get_addr = TRUE;
+ }
+ else
+ eh->tls_get_addr = 0;
+ }
+ }
+
+ if (!tls_get_addr)
+ return FALSE;
+ else if (indirect_call)
+ return (ELF32_R_TYPE (rel[1].r_info) == R_386_GOT32X);
+ else
+ return (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
+ || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
case R_386_TLS_IE:
/* Check transition from IE access model:
case R_386_TLS_DESC_CALL:
/* Check transition from GDesc access model:
- call *x@tlsdesc(%rax)
+ call *x@tlsdesc(%eax)
*/
if (offset + 2 <= sec->size)
{
- /* Make sure that it's a call *x@tlsdesc(%rax). */
- static const unsigned char call[] = { 0xff, 0x10 };
- return memcmp (contents + offset, call, 2) == 0;
+ /* Make sure that it's a call *x@tlsdesc(%eax). */
+ call = contents + offset;
+ return call[0] == 0xff && call[1] == 0x10;
}
return FALSE;
const Elf_Internal_Rela *rel,
const Elf_Internal_Rela *relend,
struct elf_link_hash_entry *h,
- unsigned long r_symndx)
+ unsigned long r_symndx,
+ bfd_boolean from_relocate_section)
{
unsigned int from_type = *r_type;
unsigned int to_type = from_type;
to_type = R_386_TLS_IE_32;
}
- /* When we are called from elf_i386_relocate_section, CONTENTS
- isn't NULL and there may be additional transitions based on
- TLS_TYPE. */
- if (contents != NULL)
+ /* When we are called from elf_i386_relocate_section, there may
+ be additional transitions based on TLS_TYPE. */
+ if (from_relocate_section)
{
unsigned int new_to_type = to_type;
/* Check if the transition can be performed. */
if (check
- && ! elf_i386_check_tls_transition (abfd, sec, contents,
+ && ! elf_i386_check_tls_transition (sec, contents,
symtab_hdr, sym_hashes,
from_type, rel, relend))
{
}
}
- (*_bfd_error_handler)
+ _bfd_error_handler
(_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
"in section `%A' failed"),
abfd, sec, from->name, to->name, name,
return TRUE;
}
+/* With the local symbol, foo, we convert
+ mov foo@GOT[(%reg1)], %reg2
+ to
+ lea foo[@GOTOFF(%reg1)], %reg2
+ and convert
+ call/jmp *foo@GOT[(%reg)]
+ to
+ nop call foo/jmp foo nop
+ When PIC is false, convert
+ test %reg1, foo@GOT[(%reg2)]
+ to
+ test $foo, %reg1
+ and convert
+ binop foo@GOT[(%reg1)], %reg2
+ to
+ binop $foo, %reg2
+ where binop is one of adc, add, and, cmp, or, sbb, sub, xor
+ instructions. */
+
+static
+bfd_boolean
+elf_i386_convert_load_reloc (bfd *abfd, Elf_Internal_Shdr *symtab_hdr,
+ bfd_byte *contents,
+ Elf_Internal_Rela *irel,
+ struct elf_link_hash_entry *h,
+ bfd_boolean *converted,
+ struct bfd_link_info *link_info)
+{
+ struct elf_i386_link_hash_table *htab;
+ unsigned int opcode;
+ unsigned int modrm;
+ bfd_boolean baseless;
+ Elf_Internal_Sym *isym;
+ unsigned int addend;
+ unsigned int nop;
+ bfd_vma nop_offset;
+ bfd_boolean is_pic;
+ bfd_boolean to_reloc_32;
+ unsigned int r_type;
+ unsigned int r_symndx;
+ bfd_vma roff = irel->r_offset;
+
+ if (roff < 2)
+ return TRUE;
+
+ /* Addend for R_386_GOT32X relocations must be 0. */
+ addend = bfd_get_32 (abfd, contents + roff);
+ if (addend != 0)
+ return TRUE;
+
+ htab = elf_i386_hash_table (link_info);
+ is_pic = bfd_link_pic (link_info);
+
+ r_type = ELF32_R_TYPE (irel->r_info);
+ r_symndx = ELF32_R_SYM (irel->r_info);
+
+ modrm = bfd_get_8 (abfd, contents + roff - 1);
+ baseless = (modrm & 0xc7) == 0x5;
+
+ if (baseless && is_pic)
+ {
+ /* For PIC, disallow R_386_GOT32X without a base register
+ since we don't know what the GOT base is. */
+ const char *name;
+
+ if (h == NULL)
+ {
+ isym = bfd_sym_from_r_symndx (&htab->sym_cache, abfd,
+ r_symndx);
+ name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
+ }
+ else
+ name = h->root.root.string;
+
+ _bfd_error_handler
+ (_("%B: direct GOT relocation R_386_GOT32X against `%s' without base register can not be used when making a shared object"),
+ abfd, name);
+ return FALSE;
+ }
+
+ opcode = bfd_get_8 (abfd, contents + roff - 2);
+
+ /* Convert to R_386_32 if PIC is false or there is no base
+ register. */
+ to_reloc_32 = !is_pic || baseless;
+
+ /* Try to convert R_386_GOT32X. Get the symbol referred to by the
+ reloc. */
+ if (h == NULL)
+ {
+ if (opcode == 0x0ff)
+ /* Convert "call/jmp *foo@GOT[(%reg)]". */
+ goto convert_branch;
+ else
+ /* Convert "mov foo@GOT[(%reg1)], %reg2",
+ "test %reg1, foo@GOT(%reg2)" and
+ "binop foo@GOT[(%reg1)], %reg2". */
+ goto convert_load;
+ }
+
+ /* Undefined weak symbol is only bound locally in executable
+ and its reference is resolved as 0. */
+ if (UNDEFINED_WEAK_RESOLVED_TO_ZERO (link_info, TRUE,
+ elf_i386_hash_entry (h)))
+ {
+ if (opcode == 0xff)
+ {
+ /* No direct branch to 0 for PIC. */
+ if (is_pic)
+ return TRUE;
+ else
+ goto convert_branch;
+ }
+ else
+ {
+ /* We can convert load of address 0 to R_386_32. */
+ to_reloc_32 = TRUE;
+ goto convert_load;
+ }
+ }
+
+ if (opcode == 0xff)
+ {
+ /* We have "call/jmp *foo@GOT[(%reg)]". */
+ if ((h->root.type == bfd_link_hash_defined
+ || h->root.type == bfd_link_hash_defweak)
+ && SYMBOL_REFERENCES_LOCAL (link_info, h))
+ {
+ /* The function is locally defined. */
+convert_branch:
+ /* Convert R_386_GOT32X to R_386_PC32. */
+ if (modrm == 0x15 || (modrm & 0xf8) == 0x90)
+ {
+ struct elf_i386_link_hash_entry *eh
+ = (struct elf_i386_link_hash_entry *) h;
+
+ /* Convert to "nop call foo". ADDR_PREFIX_OPCODE
+ is a nop prefix. */
+ modrm = 0xe8;
+ /* To support TLS optimization, always use addr32 prefix
+ for "call *___tls_get_addr@GOT(%reg)". */
+ if (eh && eh->tls_get_addr == 1)
+ {
+ nop = 0x67;
+ nop_offset = irel->r_offset - 2;
+ }
+ else
+ {
+ nop = link_info->call_nop_byte;
+ if (link_info->call_nop_as_suffix)
+ {
+ nop_offset = roff + 3;
+ irel->r_offset -= 1;
+ }
+ else
+ nop_offset = roff - 2;
+ }
+ }
+ else
+ {
+ /* Convert to "jmp foo nop". */
+ modrm = 0xe9;
+ nop = NOP_OPCODE;
+ nop_offset = roff + 3;
+ irel->r_offset -= 1;
+ }
+
+ bfd_put_8 (abfd, nop, contents + nop_offset);
+ bfd_put_8 (abfd, modrm, contents + irel->r_offset - 1);
+ /* When converting to PC-relative relocation, we
+ need to adjust addend by -4. */
+ bfd_put_32 (abfd, -4, contents + irel->r_offset);
+ irel->r_info = ELF32_R_INFO (r_symndx, R_386_PC32);
+
+ *converted = TRUE;
+ }
+ }
+ else
+ {
+ /* We have "mov foo@GOT[(%re1g)], %reg2",
+ "test %reg1, foo@GOT(%reg2)" and
+ "binop foo@GOT[(%reg1)], %reg2".
+
+ Avoid optimizing _DYNAMIC since ld.so may use its
+ link-time address. */
+ if (h == htab->elf.hdynamic)
+ return TRUE;
+
+ /* def_regular is set by an assignment in a linker script in
+ bfd_elf_record_link_assignment. */
+ if ((h->def_regular
+ || h->root.type == bfd_link_hash_defined
+ || h->root.type == bfd_link_hash_defweak)
+ && SYMBOL_REFERENCES_LOCAL (link_info, h))
+ {
+convert_load:
+ if (opcode == 0x8b)
+ {
+ if (to_reloc_32)
+ {
+ /* Convert "mov foo@GOT[(%reg1)], %reg2" to
+ "mov $foo, %reg2" with R_386_32. */
+ r_type = R_386_32;
+ modrm = 0xc0 | (modrm & 0x38) >> 3;
+ bfd_put_8 (abfd, modrm, contents + roff - 1);
+ opcode = 0xc7;
+ }
+ else
+ {
+ /* Convert "mov foo@GOT(%reg1), %reg2" to
+ "lea foo@GOTOFF(%reg1), %reg2". */
+ r_type = R_386_GOTOFF;
+ opcode = 0x8d;
+ }
+ }
+ else
+ {
+ /* Only R_386_32 is supported. */
+ if (!to_reloc_32)
+ return TRUE;
+
+ if (opcode == 0x85)
+ {
+ /* Convert "test %reg1, foo@GOT(%reg2)" to
+ "test $foo, %reg1". */
+ modrm = 0xc0 | (modrm & 0x38) >> 3;
+ opcode = 0xf7;
+ }
+ else
+ {
+ /* Convert "binop foo@GOT(%reg1), %reg2" to
+ "binop $foo, %reg2". */
+ modrm = (0xc0
+ | (modrm & 0x38) >> 3
+ | (opcode & 0x3c));
+ opcode = 0x81;
+ }
+ bfd_put_8 (abfd, modrm, contents + roff - 1);
+ r_type = R_386_32;
+ }
+
+ bfd_put_8 (abfd, opcode, contents + roff - 2);
+ irel->r_info = ELF32_R_INFO (r_symndx, r_type);
+
+ *converted = TRUE;
+ }
+ }
+
+ return TRUE;
+}
+
/* Rename some of the generic section flags to better document how they
are used here. */
#define need_convert_load sec_flg0
const Elf_Internal_Rela *rel;
const Elf_Internal_Rela *rel_end;
asection *sreloc;
+ bfd_byte *contents;
bfd_boolean use_plt_got;
if (bfd_link_relocatable (info))
return TRUE;
+ /* Don't do anything special with non-loaded, non-alloced sections.
+ In particular, any relocs in such sections should not affect GOT
+ and PLT reference counting (ie. we don't allow them to create GOT
+ or PLT entries), there's no possibility or desire to optimize TLS
+ relocs, and there's not much point in propagating relocs to shared
+ libs that the dynamic linker won't relocate. */
+ if ((sec->flags & SEC_ALLOC) == 0)
+ return TRUE;
+
BFD_ASSERT (is_i386_elf (abfd));
htab = elf_i386_hash_table (info);
return FALSE;
}
+ /* Get the section contents. */
+ if (elf_section_data (sec)->this_hdr.contents != NULL)
+ contents = elf_section_data (sec)->this_hdr.contents;
+ else if (!bfd_malloc_and_get_section (abfd, sec, &contents))
+ {
+ sec->check_relocs_failed = 1;
+ return FALSE;
+ }
+
use_plt_got = (!get_elf_i386_backend_data (abfd)->is_vxworks
&& (get_elf_i386_backend_data (abfd)
== &elf_i386_arch_bed));
if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
{
- (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
- abfd,
- r_symndx);
+ _bfd_error_handler (_("%B: bad symbol index: %d"),
+ abfd, r_symndx);
goto error_return;
}
case R_386_GOTOFF:
eh->gotoff_ref = 1;
+ /* Fall through. */
case R_386_32:
case R_386_PC32:
case R_386_PLT32:
|= elf_gnu_symbol_ifunc;
}
- if (! elf_i386_tls_transition (info, abfd, sec, NULL,
+ if (! elf_i386_tls_transition (info, abfd, sec, contents,
symtab_hdr, sym_hashes,
&r_type, GOT_UNKNOWN,
- rel, rel_end, h, r_symndx))
+ rel, rel_end, h, r_symndx, FALSE))
goto error_return;
switch (r_type)
else
name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
NULL);
- (*_bfd_error_handler)
+ _bfd_error_handler
(_("%B: `%s' accessed both as normal and "
"thread local symbol"),
abfd, name);
if (eh != NULL && (sec->flags & SEC_CODE) != 0)
eh->has_non_got_reloc = 1;
do_relocation:
- /* STT_GNU_IFUNC symbol must go through PLT even if it is
- locally defined and undefined symbol may turn out to be
- a STT_GNU_IFUNC symbol later. */
+ /* We are called after all symbols have been resolved. Only
+ relocation against STT_GNU_IFUNC symbol must go through
+ PLT. */
if (h != NULL
&& (bfd_link_executable (info)
- || ((h->type == STT_GNU_IFUNC
- || h->root.type == bfd_link_hash_undefweak
- || h->root.type == bfd_link_hash_undefined)
- && SYMBOLIC_BIND (info, h))))
+ || h->type == STT_GNU_IFUNC))
{
/* If this reloc is in a read-only section, we might
need a copy reloc. We can't check reliably at this
adjust_dynamic_symbol. */
h->non_got_ref = 1;
- /* We may need a .plt entry if the function this reloc
- refers to is in a shared lib. */
- h->plt.refcount += 1;
+ /* We may need a .plt entry if the symbol is a function
+ defined in a shared lib or is a STT_GNU_IFUNC function
+ referenced from the code or read-only section. */
+ if (!h->def_regular
+ || (sec->flags & (SEC_CODE | SEC_READONLY)) != 0)
+ h->plt.refcount += 1;
+
if (r_type == R_386_PC32)
{
/* Since something like ".long foo - ." may be used
a function defined in a shared library. */
if ((sec->flags & SEC_CODE) == 0)
h->pointer_equality_needed = 1;
+ else if (h->type == STT_GNU_IFUNC
+ && bfd_link_pic (info))
+ {
+ if (isym == NULL)
+ name = h->root.root.string;
+ else
+ name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
+ NULL);
+ _bfd_error_handler
+ (_("%B: unsupported non-PIC call to IFUNC `%s'"),
+ abfd, name);
+ bfd_set_error (bfd_error_bad_value);
+ goto error_return;
+ }
}
else
{
If on the other hand, we are creating an executable, we
may need to keep relocations for symbols satisfied by a
dynamic library if we manage to avoid copy relocs for the
- symbol. */
+ symbol.
+
+ Generate dynamic pointer relocation against STT_GNU_IFUNC
+ symbol in the non-code section. */
if ((bfd_link_pic (info)
- && (sec->flags & SEC_ALLOC) != 0
&& (r_type != R_386_PC32
|| (h != NULL
&& (! (bfd_link_pie (info)
|| SYMBOLIC_BIND (info, h))
|| h->root.type == bfd_link_hash_defweak
|| !h->def_regular))))
+ || (h != NULL
+ && h->type == STT_GNU_IFUNC
+ && r_type == R_386_32
+ && (sec->flags & SEC_CODE) == 0)
|| (ELIMINATE_COPY_RELOCS
&& !bfd_link_pic (info)
- && (sec->flags & SEC_ALLOC) != 0
&& h != NULL
&& (h->root.type == bfd_link_hash_defweak
|| !h->def_regular)))
goto error_return;
}
- if ((r_type == R_386_GOT32 || r_type == R_386_GOT32X)
+ if (r_type == R_386_GOT32X
&& (h == NULL || h->type != STT_GNU_IFUNC))
sec->need_convert_load = 1;
}
+ if (elf_section_data (sec)->this_hdr.contents != contents)
+ {
+ if (!info->keep_memory)
+ free (contents);
+ else
+ {
+ /* Cache the section contents for elf_link_input_bfd. */
+ elf_section_data (sec)->this_hdr.contents = contents;
+ }
+ }
+
return TRUE;
error_return:
+ if (elf_section_data (sec)->this_hdr.contents != contents)
+ free (contents);
sec->check_relocs_failed = 1;
return FALSE;
}
if (pc_count || count)
{
- h->needs_plt = 1;
h->non_got_ref = 1;
- if (h->plt.refcount <= 0)
- h->plt.refcount = 1;
- else
- h->plt.refcount += 1;
+ if (pc_count)
+ {
+ /* Increment PLT reference count only for PC-relative
+ references. */
+ h->needs_plt = 1;
+ if (h->plt.refcount <= 0)
+ h->plt.refcount = 1;
+ else
+ h->plt.refcount += 1;
+ }
}
}
return _bfd_elf_allocate_ifunc_dyn_relocs (info, h, &eh->dyn_relocs,
&htab->readonly_dynrelocs_against_ifunc,
plt_entry_size,
- plt_entry_size, 4);
+ plt_entry_size, 4, TRUE);
/* Don't create the PLT entry if there are only function pointer
relocations which can be resolved at run-time. */
else if (htab->elf.dynamic_sections_created
return TRUE;
}
-/* With the local symbol, foo, we convert
- mov foo@GOT[(%reg1)], %reg2
- to
- lea foo[@GOTOFF(%reg1)], %reg2
- and convert
- call/jmp *foo@GOT[(%reg)]
- to
- nop call foo/jmp foo nop
- When PIC is false, convert
- test %reg1, foo@GOT[(%reg2)]
- to
- test $foo, %reg1
- and convert
- binop foo@GOT[(%reg1)], %reg2
- to
- binop $foo, %reg2
- where binop is one of adc, add, and, cmp, or, sbb, sub, xor
- instructions. */
+/* Convert load via the GOT slot to load immediate. */
static bfd_boolean
elf_i386_convert_load (bfd *abfd, asection *sec,
struct bfd_link_info *link_info)
{
+ struct elf_i386_link_hash_table *htab;
Elf_Internal_Shdr *symtab_hdr;
Elf_Internal_Rela *internal_relocs;
Elf_Internal_Rela *irel, *irelend;
bfd_byte *contents;
- struct elf_i386_link_hash_table *htab;
- bfd_boolean changed_contents;
- bfd_boolean changed_relocs;
- bfd_boolean is_pic;
+ bfd_boolean changed;
bfd_signed_vma *local_got_refcounts;
/* Don't even try to convert non-ELF outputs. */
if (internal_relocs == NULL)
return FALSE;
+ changed = FALSE;
htab = elf_i386_hash_table (link_info);
- changed_contents = FALSE;
- changed_relocs = FALSE;
local_got_refcounts = elf_local_got_refcounts (abfd);
- is_pic = bfd_link_pic (link_info);
-
/* Get the section contents. */
if (elf_section_data (sec)->this_hdr.contents != NULL)
contents = elf_section_data (sec)->this_hdr.contents;
{
if (!bfd_malloc_and_get_section (abfd, sec, &contents))
goto error_return;
- }
-
- irelend = internal_relocs + sec->reloc_count;
- for (irel = internal_relocs; irel < irelend; irel++)
- {
- unsigned int r_type = ELF32_R_TYPE (irel->r_info);
- unsigned int r_symndx = ELF32_R_SYM (irel->r_info);
- unsigned int indx;
- struct elf_link_hash_entry *h;
- unsigned int opcode;
- unsigned int modrm;
- bfd_vma roff;
- bfd_boolean baseless;
- Elf_Internal_Sym *isym;
- unsigned int addend;
- unsigned int nop;
- bfd_vma nop_offset;
- bfd_boolean to_reloc_32;
-
- if (r_type != R_386_GOT32 && r_type != R_386_GOT32X)
- continue;
-
- roff = irel->r_offset;
- if (roff < 2)
- continue;
-
- /* Addend for R_386_GOT32 and R_386_GOT32X relocations must be 0. */
- addend = bfd_get_32 (abfd, contents + roff);
- if (addend != 0)
- continue;
-
- modrm = bfd_get_8 (abfd, contents + roff - 1);
- baseless = (modrm & 0xc7) == 0x5;
-
- if (r_type == R_386_GOT32X && baseless && is_pic)
- {
- /* For PIC, disallow R_386_GOT32X without a base register
- since we don't know what the GOT base is. Allow
- R_386_GOT32 for existing object files. */
- const char *name;
-
- if (r_symndx < symtab_hdr->sh_info)
- {
- isym = bfd_sym_from_r_symndx (&htab->sym_cache, abfd,
- r_symndx);
- name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
- }
- else
- {
- indx = r_symndx - symtab_hdr->sh_info;
- h = elf_sym_hashes (abfd)[indx];
- BFD_ASSERT (h != NULL);
- name = h->root.root.string;
- }
-
- (*_bfd_error_handler)
- (_("%B: direct GOT relocation R_386_GOT32X against `%s' without base register can not be used when making a shared object"),
- abfd, name);
- goto error_return;
- }
-
- opcode = bfd_get_8 (abfd, contents + roff - 2);
-
- /* Convert mov to lea since it has been done for a while. */
- if (opcode != 0x8b)
- {
- /* Only convert R_386_GOT32X relocation for call, jmp or
- one of adc, add, and, cmp, or, sbb, sub, test, xor
- instructions. */
- if (r_type != R_386_GOT32X)
- continue;
- }
-
- /* Convert to R_386_32 if PIC is false or there is no base
- register. */
- to_reloc_32 = !is_pic || baseless;
-
- /* Try to convert R_386_GOT32 and R_386_GOT32X. Get the symbol
- referred to by the reloc. */
- if (r_symndx < symtab_hdr->sh_info)
- {
- isym = bfd_sym_from_r_symndx (&htab->sym_cache,
- abfd, r_symndx);
-
- /* STT_GNU_IFUNC must keep GOT32 relocations. */
- if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
- continue;
-
- h = NULL;
- if (opcode == 0x0ff)
- /* Convert "call/jmp *foo@GOT[(%reg)]". */
- goto convert_branch;
- else
- /* Convert "mov foo@GOT[(%reg1)], %reg2",
- "test %reg1, foo@GOT(%reg2)" and
- "binop foo@GOT[(%reg1)], %reg2". */
- goto convert_load;
- }
-
- indx = r_symndx - symtab_hdr->sh_info;
- h = elf_sym_hashes (abfd)[indx];
- BFD_ASSERT (h != NULL);
-
- while (h->root.type == bfd_link_hash_indirect
- || h->root.type == bfd_link_hash_warning)
- h = (struct elf_link_hash_entry *) h->root.u.i.link;
-
- /* STT_GNU_IFUNC must keep GOT32 relocations. */
- if (h->type == STT_GNU_IFUNC)
- continue;
-
- /* Undefined weak symbol is only bound locally in executable
- and its reference is resolved as 0. */
- if (UNDEFINED_WEAK_RESOLVED_TO_ZERO (link_info, TRUE,
- elf_i386_hash_entry (h)))
- {
- if (opcode == 0xff)
- {
- /* No direct branch to 0 for PIC. */
- if (is_pic)
- continue;
- else
- goto convert_branch;
- }
- else
- {
- /* We can convert load of address 0 to R_386_32. */
- to_reloc_32 = TRUE;
- goto convert_load;
- }
- }
-
- if (opcode == 0xff)
- {
- /* We have "call/jmp *foo@GOT[(%reg)]". */
- if ((h->root.type == bfd_link_hash_defined
- || h->root.type == bfd_link_hash_defweak)
- && SYMBOL_REFERENCES_LOCAL (link_info, h))
- {
- /* The function is locally defined. */
-convert_branch:
- /* Convert R_386_GOT32X to R_386_PC32. */
- if (modrm == 0x15 || (modrm & 0xf8) == 0x90)
- {
- /* Convert to "nop call foo". ADDR_PREFIX_OPCODE
- is a nop prefix. */
- modrm = 0xe8;
- nop = link_info->call_nop_byte;
- if (link_info->call_nop_as_suffix)
- {
- nop_offset = roff + 3;
- irel->r_offset -= 1;
- }
- else
- nop_offset = roff - 2;
- }
- else
- {
- /* Convert to "jmp foo nop". */
- modrm = 0xe9;
- nop = NOP_OPCODE;
- nop_offset = roff + 3;
- irel->r_offset -= 1;
- }
-
- bfd_put_8 (abfd, nop, contents + nop_offset);
- bfd_put_8 (abfd, modrm, contents + irel->r_offset - 1);
- /* When converting to PC-relative relocation, we
- need to adjust addend by -4. */
- bfd_put_32 (abfd, -4, contents + irel->r_offset);
- irel->r_info = ELF32_R_INFO (r_symndx, R_386_PC32);
-
- if (h)
- {
- if (h->got.refcount > 0)
- h->got.refcount -= 1;
- }
- else
- {
- if (local_got_refcounts != NULL
- && local_got_refcounts[r_symndx] > 0)
- local_got_refcounts[r_symndx] -= 1;
- }
-
- changed_contents = TRUE;
- changed_relocs = TRUE;
- }
- }
- else
- {
- /* We have "mov foo@GOT[(%re1g)], %reg2",
- "test %reg1, foo@GOT(%reg2)" and
- "binop foo@GOT[(%reg1)], %reg2".
+ }
- Avoid optimizing _DYNAMIC since ld.so may use its
- link-time address. */
- if (h == htab->elf.hdynamic)
- continue;
+ irelend = internal_relocs + sec->reloc_count;
+ for (irel = internal_relocs; irel < irelend; irel++)
+ {
+ unsigned int r_type = ELF32_R_TYPE (irel->r_info);
+ unsigned int r_symndx;
+ struct elf_link_hash_entry *h;
+ bfd_boolean converted;
- /* def_regular is set by an assignment in a linker script in
- bfd_elf_record_link_assignment. */
- if ((h->def_regular
- || h->root.type == bfd_link_hash_defined
- || h->root.type == bfd_link_hash_defweak)
- && SYMBOL_REFERENCES_LOCAL (link_info, h))
- {
-convert_load:
- if (opcode == 0x8b)
- {
- if (to_reloc_32)
- {
- /* Convert "mov foo@GOT[(%reg1)], %reg2" to
- "mov $foo, %reg2" with R_386_32. */
- r_type = R_386_32;
- modrm = 0xc0 | (modrm & 0x38) >> 3;
- bfd_put_8 (abfd, modrm, contents + roff - 1);
- opcode = 0xc7;
- }
- else
- {
- /* Convert "mov foo@GOT(%reg1), %reg2" to
- "lea foo@GOTOFF(%reg1), %reg2". */
- r_type = R_386_GOTOFF;
- opcode = 0x8d;
- }
- }
- else
- {
- /* Only R_386_32 is supported. */
- if (!to_reloc_32)
- continue;
+ /* Don't convert R_386_GOT32 since we can't tell if it is applied
+ to "mov $foo@GOT, %reg" which isn't a load via GOT. */
+ if (r_type != R_386_GOT32X)
+ continue;
- if (opcode == 0x85)
- {
- /* Convert "test %reg1, foo@GOT(%reg2)" to
- "test $foo, %reg1". */
- modrm = 0xc0 | (modrm & 0x38) >> 3;
- opcode = 0xf7;
- }
- else
- {
- /* Convert "binop foo@GOT(%reg1), %reg2" to
- "binop $foo, %reg2". */
- modrm = (0xc0
- | (modrm & 0x38) >> 3
- | (opcode & 0x3c));
- opcode = 0x81;
- }
- bfd_put_8 (abfd, modrm, contents + roff - 1);
- r_type = R_386_32;
- }
+ r_symndx = ELF32_R_SYM (irel->r_info);
+ if (r_symndx < symtab_hdr->sh_info)
+ h = elf_i386_get_local_sym_hash (htab, sec->owner,
+ (const Elf_Internal_Rela *) irel,
+ FALSE);
+ else
+ {
+ h = elf_sym_hashes (abfd)[r_symndx - symtab_hdr->sh_info];
+ while (h->root.type == bfd_link_hash_indirect
+ || h->root.type == bfd_link_hash_warning)
+ h = (struct elf_link_hash_entry *) h->root.u.i.link;
+ }
- bfd_put_8 (abfd, opcode, contents + roff - 2);
- irel->r_info = ELF32_R_INFO (r_symndx, r_type);
+ /* STT_GNU_IFUNC must keep GOT32 relocations. */
+ if (h != NULL && h->type == STT_GNU_IFUNC)
+ continue;
- if (h)
- {
- if (h->got.refcount > 0)
- h->got.refcount -= 1;
- }
- else
- {
- if (local_got_refcounts != NULL
- && local_got_refcounts[r_symndx] > 0)
- local_got_refcounts[r_symndx] -= 1;
- }
+ converted = FALSE;
+ if (!elf_i386_convert_load_reloc (abfd, symtab_hdr, contents,
+ irel, h, &converted, link_info))
+ goto error_return;
- changed_contents = TRUE;
- changed_relocs = TRUE;
+ if (converted)
+ {
+ changed = converted;
+ if (h)
+ {
+ if (h->got.refcount > 0)
+ h->got.refcount -= 1;
+ }
+ else
+ {
+ if (local_got_refcounts != NULL
+ && local_got_refcounts[r_symndx] > 0)
+ local_got_refcounts[r_symndx] -= 1;
}
}
}
if (contents != NULL
&& elf_section_data (sec)->this_hdr.contents != contents)
{
- if (!changed_contents && !link_info->keep_memory)
+ if (!changed && !link_info->keep_memory)
free (contents);
else
{
if (elf_section_data (sec)->relocs != internal_relocs)
{
- if (!changed_relocs)
+ if (!changed)
free (internal_relocs);
else
elf_section_data (sec)->relocs = internal_relocs;
if (dynobj == NULL)
abort ();
- if (htab->elf.dynamic_sections_created)
- {
- /* Set the contents of the .interp section to the interpreter. */
- if (bfd_link_executable (info) && !info->nointerp)
- {
- s = bfd_get_linker_section (dynobj, ".interp");
- if (s == NULL)
- abort ();
- s->size = sizeof ELF_DYNAMIC_INTERPRETER;
- s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
- htab->interp = s;
- }
- }
-
/* Set up .got offsets for local syms, and space for local dynamic
relocs. */
for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
&& ((indx = r_type - R_386_tls_offset) - R_386_ext
>= R_386_ext2 - R_386_ext))
{
- (*_bfd_error_handler)
+ _bfd_error_handler
(_("%B: unrecognized relocation (0x%x) in section `%A'"),
input_bfd, input_section, r_type);
bfd_set_error (bfd_error_bad_value);
continue;
abort ();
}
- else if (h->plt.offset == (bfd_vma) -1)
- abort ();
/* STT_GNU_IFUNC symbol must go through PLT. */
if (htab->elf.splt != NULL)
gotplt = htab->elf.igotplt;
}
+ switch (r_type)
+ {
+ default:
+ break;
+
+ case R_386_GOT32:
+ case R_386_GOT32X:
+ base_got = htab->elf.sgot;
+ off = h->got.offset;
+
+ if (base_got == NULL)
+ abort ();
+
+ if (off == (bfd_vma) -1)
+ {
+ /* We can't use h->got.offset here to save state, or
+ even just remember the offset, as finish_dynamic_symbol
+ would use that as offset into .got. */
+
+ if (h->plt.offset == (bfd_vma) -1)
+ abort ();
+
+ if (htab->elf.splt != NULL)
+ {
+ plt_index = h->plt.offset / plt_entry_size - 1;
+ off = (plt_index + 3) * 4;
+ base_got = htab->elf.sgotplt;
+ }
+ else
+ {
+ plt_index = h->plt.offset / plt_entry_size;
+ off = plt_index * 4;
+ base_got = htab->elf.igotplt;
+ }
+
+ if (h->dynindx == -1
+ || h->forced_local
+ || info->symbolic)
+ {
+ /* This references the local defitionion. We must
+ initialize this entry in the global offset table.
+ Since the offset must always be a multiple of 8,
+ we use the least significant bit to record
+ whether we have initialized it already.
+
+ When doing a dynamic link, we create a .rela.got
+ relocation entry to initialize the value. This
+ is done in the finish_dynamic_symbol routine. */
+ if ((off & 1) != 0)
+ off &= ~1;
+ else
+ {
+ bfd_put_32 (output_bfd, relocation,
+ base_got->contents + off);
+ h->got.offset |= 1;
+ }
+ }
+
+ relocation = off;
+ }
+ else
+ relocation = (base_got->output_section->vma
+ + base_got->output_offset + off
+ - gotplt->output_section->vma
+ - gotplt->output_offset);
+
+ if ((*(contents + rel->r_offset - 1) & 0xc7) == 0x5)
+ {
+ if (bfd_link_pic (info))
+ goto disallow_got32;
+
+ /* Add the GOT base if there is no base register. */
+ relocation += (gotplt->output_section->vma
+ + gotplt->output_offset);
+ }
+ else if (htab->elf.splt == NULL)
+ {
+ /* Adjust for static executables. */
+ relocation += gotplt->output_offset;
+ }
+
+ goto do_relocation;
+ }
+
+ if (h->plt.offset == (bfd_vma) -1)
+ {
+ /* Handle static pointers of STT_GNU_IFUNC symbols. */
+ if (r_type == R_386_32
+ && (input_section->flags & SEC_CODE) == 0)
+ goto do_ifunc_pointer;
+ goto bad_ifunc_reloc;
+ }
+
relocation = (plt->output_section->vma
+ plt->output_offset + h->plt.offset);
switch (r_type)
{
default:
+bad_ifunc_reloc:
if (h->root.root.string)
name = h->root.root.string;
else
name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
NULL);
- (*_bfd_error_handler)
+ _bfd_error_handler
(_("%B: relocation %s against STT_GNU_IFUNC "
- "symbol `%s' isn't handled by %s"), input_bfd,
- elf_howto_table[r_type].name,
- name, __FUNCTION__);
+ "symbol `%s' isn't supported"), input_bfd,
+ howto->name, name);
bfd_set_error (bfd_error_bad_value);
return FALSE;
case R_386_32:
/* Generate dynamic relcoation only when there is a
non-GOT reference in a shared object. */
- if (bfd_link_pic (info) && h->non_got_ref)
+ if ((bfd_link_pic (info) && h->non_got_ref)
+ || h->plt.offset == (bfd_vma) -1)
{
Elf_Internal_Rela outrel;
asection *sreloc;
bfd_vma offset;
+do_ifunc_pointer:
/* Need a dynamic relocation to get the real function
adddress. */
offset = _bfd_elf_section_offset (output_bfd,
else
outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
- sreloc = htab->elf.irelifunc;
+ /* Dynamic relocations are stored in
+ 1. .rel.ifunc section in PIC object.
+ 2. .rel.got section in dynamic executable.
+ 3. .rel.iplt section in static executable. */
+ if (bfd_link_pic (info))
+ sreloc = htab->elf.irelifunc;
+ else if (htab->elf.splt != NULL)
+ sreloc = htab->elf.srelgot;
+ else
+ sreloc = htab->elf.irelplt;
elf_append_rel (output_bfd, sreloc, &outrel);
/* If this reloc is against an external symbol, we
case R_386_PLT32:
goto do_relocation;
- case R_386_GOT32:
- case R_386_GOT32X:
- base_got = htab->elf.sgot;
- off = h->got.offset;
-
- if (base_got == NULL)
- abort ();
-
- if (off == (bfd_vma) -1)
- {
- /* We can't use h->got.offset here to save state, or
- even just remember the offset, as finish_dynamic_symbol
- would use that as offset into .got. */
-
- if (htab->elf.splt != NULL)
- {
- plt_index = h->plt.offset / plt_entry_size - 1;
- off = (plt_index + 3) * 4;
- base_got = htab->elf.sgotplt;
- }
- else
- {
- plt_index = h->plt.offset / plt_entry_size;
- off = plt_index * 4;
- base_got = htab->elf.igotplt;
- }
-
- if (h->dynindx == -1
- || h->forced_local
- || info->symbolic)
- {
- /* This references the local defitionion. We must
- initialize this entry in the global offset table.
- Since the offset must always be a multiple of 8,
- we use the least significant bit to record
- whether we have initialized it already.
-
- When doing a dynamic link, we create a .rela.got
- relocation entry to initialize the value. This
- is done in the finish_dynamic_symbol routine. */
- if ((off & 1) != 0)
- off &= ~1;
- else
- {
- bfd_put_32 (output_bfd, relocation,
- base_got->contents + off);
- h->got.offset |= 1;
- }
- }
-
- relocation = off;
-
- /* Adjust for static executables. */
- if (htab->elf.splt == NULL)
- relocation += gotplt->output_offset;
- }
- else
- {
- relocation = (base_got->output_section->vma
- + base_got->output_offset + off
- - gotplt->output_section->vma
- - gotplt->output_offset);
- /* Adjust for static executables. */
- if (htab->elf.splt == NULL)
- relocation += gotplt->output_offset;
- }
-
- goto do_relocation;
-
case R_386_GOTOFF:
relocation -= (gotplt->output_section->vma
+ gotplt->output_offset);
if (off >= (bfd_vma) -2)
abort ();
- relocation = htab->elf.sgot->output_section->vma
- + htab->elf.sgot->output_offset + off
- - htab->elf.sgotplt->output_section->vma
- - htab->elf.sgotplt->output_offset;
+ relocation = (htab->elf.sgot->output_section->vma
+ + htab->elf.sgot->output_offset + off);
+ if ((*(contents + rel->r_offset - 1) & 0xc7) == 0x5)
+ {
+ if (bfd_link_pic (info))
+ {
+ /* For PIC, disallow R_386_GOT32 without a base
+ register since we don't know what the GOT base
+ is. */
+ const char *name;
+
+disallow_got32:
+ if (h == NULL)
+ name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
+ NULL);
+ else
+ name = h->root.root.string;
+
+ _bfd_error_handler
+ (_("%B: direct GOT relocation %s against `%s' without base register can not be used when making a shared object"),
+ input_bfd, howto->name, name);
+ bfd_set_error (bfd_error_bad_value);
+ return FALSE;
+ }
+ }
+ else
+ {
+ /* Subtract the .got.plt section address only with a base
+ register. */
+ relocation -= (htab->elf.sgotplt->output_section->vma
+ + htab->elf.sgotplt->output_offset);
+ }
+
break;
case R_386_GOTOFF:
break;
}
- (*_bfd_error_handler)
+ _bfd_error_handler
(_("%B: relocation R_386_GOTOFF against undefined %s `%s' can not be used when making a shared object"),
input_bfd, v, h->root.root.string);
bfd_set_error (bfd_error_bad_value);
|| h->type == STT_OBJECT)
&& ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
{
- (*_bfd_error_handler)
+ _bfd_error_handler
(_("%B: relocation R_386_GOTOFF against protected %s `%s' can not be used when making a shared object"),
input_bfd,
h->type == STT_FUNC ? "function" : "data",
input_section, contents,
symtab_hdr, sym_hashes,
&r_type, tls_type, rel,
- relend, h, r_symndx))
+ relend, h, r_symndx, TRUE))
return FALSE;
if (r_type == R_386_TLS_LE_32)
bfd_vma roff;
/* GD->LE transition. */
- type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
+ type = *(contents + rel->r_offset - 2);
if (type == 0x04)
{
- /* leal foo(,%reg,1), %eax; call ___tls_get_addr
- Change it into:
- movl %gs:0, %eax; subl $foo@tpoff, %eax
+ /* Change
+ leal foo@tlsgd(,%ebx,1), %eax
+ call ___tls_get_addr@PLT
+ into:
+ movl %gs:0, %eax
+ subl $foo@tpoff, %eax
(6 byte form of subl). */
- memcpy (contents + rel->r_offset - 3,
- "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
roff = rel->r_offset + 5;
}
else
{
- /* leal foo(%reg), %eax; call ___tls_get_addr; nop
- Change it into:
- movl %gs:0, %eax; subl $foo@tpoff, %eax
+ /* Change
+ leal foo@tlsgd(%ebx), %eax
+ call ___tls_get_addr@PLT
+ nop
+ or
+ leal foo@tlsgd(%reg), %eax
+ call *___tls_get_addr@GOT(%reg)
+ which may be converted to
+ addr32 call ___tls_get_addr
+ into:
+ movl %gs:0, %eax; subl $foo@tpoff, %eax
(6 byte form of subl). */
- memcpy (contents + rel->r_offset - 2,
- "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
roff = rel->r_offset + 6;
}
+ memcpy (contents + roff - 8,
+ "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
contents + roff);
- /* Skip R_386_PC32/R_386_PLT32. */
+ /* Skip R_386_PC32, R_386_PLT32 and R_386_GOT32X. */
rel++;
wrel++;
continue;
bfd_vma roff;
/* GD->IE transition. */
- type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
- val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
+ type = *(contents + rel->r_offset - 2);
+ val = *(contents + rel->r_offset - 1);
if (type == 0x04)
{
- /* leal foo(,%reg,1), %eax; call ___tls_get_addr
- Change it into:
- movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
+ /* Change
+ leal foo@tlsgd(,%ebx,1), %eax
+ call ___tls_get_addr@PLT
+ into:
+ movl %gs:0, %eax
+ subl $foo@gottpoff(%ebx), %eax. */
val >>= 3;
roff = rel->r_offset - 3;
}
else
{
- /* leal foo(%reg), %eax; call ___tls_get_addr; nop
- Change it into:
- movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
+ /* Change
+ leal foo@tlsgd(%ebx), %eax
+ call ___tls_get_addr@PLT
+ nop
+ or
+ leal foo@tlsgd(%reg), %eax
+ call *___tls_get_addr@GOT(%reg)
+ which may be converted to
+ addr32 call ___tls_get_addr
+ into:
+ movl %gs:0, %eax;
+ subl $foo@gottpoff(%reg), %eax. */
roff = rel->r_offset - 2;
}
memcpy (contents + roff,
- htab->elf.sgotplt->output_section->vma
- htab->elf.sgotplt->output_offset,
contents + roff + 8);
- /* Skip R_386_PLT32. */
+ /* Skip R_386_PLT32 and R_386_GOT32X. */
rel++;
wrel++;
continue;
input_section, contents,
symtab_hdr, sym_hashes,
&r_type, GOT_UNKNOWN, rel,
- relend, h, r_symndx))
+ relend, h, r_symndx, TRUE))
return FALSE;
if (r_type != R_386_TLS_LDM)
{
- /* LD->LE transition:
- leal foo(%reg), %eax; call ___tls_get_addr.
- We change it into:
- movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
+ /* LD->LE transition. Change
+ leal foo@tlsldm(%ebx) %eax
+ call ___tls_get_addr@PLT
+ into:
+ movl %gs:0, %eax
+ nop
+ leal 0(%esi,1), %esi
+ or change
+ leal foo@tlsldm(%reg) %eax
+ call *___tls_get_addr@GOT(%reg)
+ which may be converted to
+ addr32 call ___tls_get_addr
+ into:
+ movl %gs:0, %eax
+ leal 0(%esi), %esi */
BFD_ASSERT (r_type == R_386_TLS_LE_32);
- memcpy (contents + rel->r_offset - 2,
- "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
+ if (*(contents + rel->r_offset + 4) == 0xff
+ || *(contents + rel->r_offset + 4) == 0x67)
+ memcpy (contents + rel->r_offset - 2,
+ "\x65\xa1\0\0\0\0\x8d\xb6\0\0\0", 12);
+ else
+ memcpy (contents + rel->r_offset - 2,
+ "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
/* Skip R_386_PC32/R_386_PLT32. */
rel++;
wrel++;
&& _bfd_elf_section_offset (output_bfd, info, input_section,
rel->r_offset) != (bfd_vma) -1)
{
- (*_bfd_error_handler)
+ _bfd_error_handler
(_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
input_bfd,
input_section,
}
if (r == bfd_reloc_overflow)
- {
- if (! ((*info->callbacks->reloc_overflow)
- (info, (h ? &h->root : NULL), name, howto->name,
- (bfd_vma) 0, input_bfd, input_section,
- rel->r_offset)))
- return FALSE;
- }
+ (*info->callbacks->reloc_overflow)
+ (info, (h ? &h->root : NULL), name, howto->name,
+ (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
else
{
- (*_bfd_error_handler)
+ _bfd_error_handler
(_("%B(%A+0x%lx): reloc against `%s': error %d"),
input_bfd, input_section,
(long) rel->r_offset, name, (int) r);
&& !local_undefweak)
{
Elf_Internal_Rela rel;
+ asection *relgot = htab->elf.srelgot;
/* This symbol has an entry in the global offset table. Set it
up. */
if (h->def_regular
&& h->type == STT_GNU_IFUNC)
{
- if (bfd_link_pic (info))
+ if (h->plt.offset == (bfd_vma) -1)
+ {
+ /* STT_GNU_IFUNC is referenced without PLT. */
+ if (htab->elf.splt == NULL)
+ {
+ /* use .rel[a].iplt section to store .got relocations
+ in static executable. */
+ relgot = htab->elf.irelplt;
+ }
+ if (SYMBOL_REFERENCES_LOCAL (info, h))
+ {
+ bfd_put_32 (output_bfd,
+ (h->root.u.def.value
+ + h->root.u.def.section->output_section->vma
+ + h->root.u.def.section->output_offset),
+ htab->elf.sgot->contents + h->got.offset);
+ rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
+ }
+ else
+ goto do_glob_dat;
+ }
+ else if (bfd_link_pic (info))
{
/* Generate R_386_GLOB_DAT. */
goto do_glob_dat;
rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
}
- elf_append_rel (output_bfd, htab->elf.srelgot, &rel);
+ elf_append_rel (output_bfd, relgot, &rel);
}
if (h->needs_copy)
/* Check relocation against STT_GNU_IFUNC symbol if there are
dynamic symbols. */
unsigned long r_symndx = ELF32_R_SYM (rela->r_info);
- Elf_Internal_Sym sym;
- if (!bed->s->swap_symbol_in (abfd,
- (htab->dynsym->contents
- + r_symndx * sizeof (Elf32_External_Sym)),
- 0, &sym))
- abort ();
+ if (r_symndx != STN_UNDEF)
+ {
+ Elf_Internal_Sym sym;
+ if (!bed->s->swap_symbol_in (abfd,
+ (htab->dynsym->contents
+ + r_symndx * sizeof (Elf32_External_Sym)),
+ 0, &sym))
+ abort ();
- if (ELF32_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
- return reloc_class_ifunc;
+ if (ELF32_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
+ return reloc_class_ifunc;
+ }
}
switch (ELF32_R_TYPE (rela->r_info))
{
+ case R_386_IRELATIVE:
+ return reloc_class_ifunc;
case R_386_RELATIVE:
return reloc_class_relative;
case R_386_JUMP_SLOT:
{
if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
{
- (*_bfd_error_handler)
+ _bfd_error_handler
(_("discarded output section: `%A'"), htab->elf.sgotplt);
return FALSE;
}
if (htab->elf.sgot && htab->elf.sgot->size > 0)
elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize = 4;
- /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
- htab_traverse (htab->loc_hash_table,
- elf_i386_finish_local_dynamic_symbol,
- info);
-
/* Fill PLT entries for undefined weak symbols in PIE. */
if (bfd_link_pie (info))
bfd_hash_traverse (&info->hash->table,
return TRUE;
}
+/* Fill PLT/GOT entries and allocate dynamic relocations for local
+ STT_GNU_IFUNC symbols, which aren't in the ELF linker hash table.
+ It has to be done before elf_link_sort_relocs is called so that
+ dynamic relocations are properly sorted. */
+
+static bfd_boolean
+elf_i386_output_arch_local_syms
+ (bfd *output_bfd ATTRIBUTE_UNUSED,
+ struct bfd_link_info *info,
+ void *flaginfo ATTRIBUTE_UNUSED,
+ int (*func) (void *, const char *,
+ Elf_Internal_Sym *,
+ asection *,
+ struct elf_link_hash_entry *) ATTRIBUTE_UNUSED)
+{
+ struct elf_i386_link_hash_table *htab = elf_i386_hash_table (info);
+ if (htab == NULL)
+ return FALSE;
+
+ /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
+ htab_traverse (htab->loc_hash_table,
+ elf_i386_finish_local_dynamic_symbol,
+ info);
+
+ return TRUE;
+}
+
/* Return an array of PLT entry symbol values. */
static bfd_vma *
return _bfd_elf_hash_symbol (h);
}
-/* Hook called by the linker routine which adds symbols from an object
- file. */
-
-static bfd_boolean
-elf_i386_add_symbol_hook (bfd * abfd,
- struct bfd_link_info * info,
- Elf_Internal_Sym * sym,
- const char ** namep ATTRIBUTE_UNUSED,
- flagword * flagsp ATTRIBUTE_UNUSED,
- asection ** secp ATTRIBUTE_UNUSED,
- bfd_vma * valp ATTRIBUTE_UNUSED)
-{
- if (ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE
- && (abfd->flags & DYNAMIC) == 0
- && bfd_get_flavour (info->output_bfd) == bfd_target_elf_flavour)
- elf_tdata (info->output_bfd)->has_gnu_symbols
- |= elf_gnu_symbol_unique;
-
- return TRUE;
-}
-
#define TARGET_LITTLE_SYM i386_elf32_vec
#define TARGET_LITTLE_NAME "elf32-i386"
#define ELF_ARCH bfd_arch_i386
#define elf_backend_got_header_size 12
#define elf_backend_plt_alignment 4
#define elf_backend_extern_protected_data 1
+#define elf_backend_caches_rawsize 1
/* Support RELA for objdump of prelink objects. */
#define elf_info_to_howto elf_i386_info_to_howto_rel
#define elf_backend_fake_sections elf_i386_fake_sections
#define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
#define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
+#define elf_backend_output_arch_local_syms elf_i386_output_arch_local_syms
#define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
#define elf_backend_grok_prstatus elf_i386_grok_prstatus
#define elf_backend_grok_psinfo elf_i386_grok_psinfo
#define elf_backend_omit_section_dynsym \
((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
#define elf_backend_hash_symbol elf_i386_hash_symbol
-#define elf_backend_add_symbol_hook elf_i386_add_symbol_hook
#define elf_backend_fixup_symbol elf_i386_fixup_symbol
#include "elf32-target.h"
projects / deliverable / binutils-gdb.git / blobdiff