/* PowerPC64-specific support for 64-bit ELF.
Copyright 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,
- 2009, 2010, 2011 Free Software Foundation, Inc.
+ 2009, 2010, 2011, 2012 Free Software Foundation, Inc.
Written by Linus Nordberg, Swox AB <info@swox.com>,
based on elf32-ppc.c by Ian Lance Taylor.
Largely rewritten by Alan Modra.
static bfd_reloc_status_type ppc64_elf_unhandled_reloc
(bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
static bfd_vma opd_entry_value
- (asection *, bfd_vma, asection **, bfd_vma *);
+ (asection *, bfd_vma, asection **, bfd_vma *, bfd_boolean);
#define TARGET_LITTLE_SYM bfd_elf64_powerpcle_vec
#define TARGET_LITTLE_NAME "elf64-powerpcle"
#define elf_backend_gc_sweep_hook ppc64_elf_gc_sweep_hook
#define elf_backend_adjust_dynamic_symbol ppc64_elf_adjust_dynamic_symbol
#define elf_backend_hide_symbol ppc64_elf_hide_symbol
+#define elf_backend_maybe_function_sym ppc64_elf_maybe_function_sym
#define elf_backend_always_size_sections ppc64_elf_func_desc_adjust
#define elf_backend_size_dynamic_sections ppc64_elf_size_dynamic_sections
#define elf_backend_init_index_section _bfd_elf_init_2_index_sections
#define ADDIS_R2_R2 0x3c420000 /* addis %r2,%r2,off@ha */
#define ADDI_R2_R2 0x38420000 /* addi %r2,%r2,off@l */
+#define XOR_R11_R11_R11 0x7d6b5a78 /* xor %r11,%r11,%r11 */
+#define ADD_R12_R12_R11 0x7d8c5a14 /* add %r12,%r12,%r11 */
+#define ADD_R2_R2_R11 0x7c425a14 /* add %r2,%r2,%r11 */
+#define CMPLDI_R2_0 0x28220000 /* cmpldi %r2,0 */
+#define BNECTR 0x4ca20420 /* bnectr+ */
+#define BNECTR_P4 0x4ce20420 /* bnectr+ */
+
#define LD_R11_0R2 0xe9620000 /* ld %r11,xxx+0(%r2) */
#define LD_R2_0R2 0xe8420000 /* ld %r2,xxx+0(%r2) */
0, /* dst_mask */
FALSE), /* pcrel_offset */
+ HOWTO (R_PPC64_TOCSAVE,
+ 0, /* rightshift */
+ 2, /* size (0 = byte, 1 = short, 2 = long) */
+ 32, /* bitsize */
+ FALSE, /* pc_relative */
+ 0, /* bitpos */
+ complain_overflow_dont, /* complain_on_overflow */
+ bfd_elf_generic_reloc, /* special_function */
+ "R_PPC64_TOCSAVE", /* name */
+ FALSE, /* partial_inplace */
+ 0, /* src_mask */
+ 0, /* dst_mask */
+ FALSE), /* pcrel_offset */
+
/* Computes the load module index of the load module that contains the
definition of its TLS sym. */
HOWTO (R_PPC64_DTPMOD64,
{
bfd_vma dest = opd_entry_value (symbol->section,
symbol->value + reloc_entry->addend,
- NULL, NULL);
+ NULL, NULL, FALSE);
if (dest != (bfd_vma) -1)
reloc_entry->addend = dest - (symbol->value
+ symbol->section->output_section->vma
long insn;
enum elf_ppc64_reloc_type r_type;
bfd_size_type octets;
- /* Disabled until we sort out how ld should choose 'y' vs 'at'. */
- bfd_boolean is_power4 = FALSE;
+ /* Assume 'at' branch hints. */
+ bfd_boolean is_isa_v2 = TRUE;
/* If this is a relocatable link (output_bfd test tells us), just
call the generic function. Any adjustment will be done at final
|| r_type == R_PPC64_REL14_BRTAKEN)
insn |= 0x01 << 21; /* 'y' or 't' bit, lowest bit of BO field. */
- if (is_power4)
+ if (is_isa_v2)
{
/* Set 'a' bit. This is 0b00010 in BO field for branch
on CR(BI) insns (BO == 001at or 011at), and 0b01000
the reloc to be in the range -32768 to 32767. */
unsigned int has_small_toc_reloc : 1;
- /* Set if toc/got ha relocs detected not using r2. */
- unsigned int ha_relocs_not_using_r2 : 1;
+ /* Set if toc/got ha relocs detected not using r2, or lo reloc
+ instruction not one we handle. */
+ unsigned int unexpected_toc_insn : 1;
};
#define ppc64_elf_tdata(bfd) \
va_list ap;
va_start (ap, note_type);
- memset (data, 0, 40);
+ memset (data, 0, sizeof (data));
strncpy (data + 40, va_arg (ap, const char *), 16);
strncpy (data + 56, va_arg (ap, const char *), 80);
va_end (ap);
slurp_relocs = get_elf_backend_data (abfd)->s->slurp_reloc_table;
if (! (*slurp_relocs) (abfd, relplt, dyn_syms, TRUE))
goto free_contents_and_exit;
-
+
plt_count = relplt->size / sizeof (Elf64_External_Rela);
size += plt_count * sizeof (asymbol);
ppc_stub_long_branch_r2off,
ppc_stub_plt_branch,
ppc_stub_plt_branch_r2off,
- ppc_stub_plt_call
+ ppc_stub_plt_call,
+ ppc_stub_plt_call_r2save
};
struct ppc_stub_hash_entry {
/* Another hash table for plt_branch stubs. */
struct bfd_hash_table branch_hash_table;
+ /* Hash table for function prologue tocsave. */
+ htab_t tocsave_htab;
+
/* Linker stub bfd. */
bfd *stub_bfd;
struct ppc_link_hash_entry *tls_get_addr;
struct ppc_link_hash_entry *tls_get_addr_fd;
+ /* The special .TOC. symbol. */
+ struct ppc_link_hash_entry *dot_toc_dot;
+
/* The size of reliplt used by got entry relocs. */
bfd_size_type got_reli_size;
/* Statistics. */
- unsigned long stub_count[ppc_stub_plt_call];
+ unsigned long stub_count[ppc_stub_plt_call_r2save];
/* Number of stubs against global syms. */
unsigned long stub_globals;
+ /* Alignment of PLT call stubs. */
+ unsigned int plt_stub_align:4;
+
/* Set if PLT call stubs should load r11. */
unsigned int plt_static_chain:1;
+ /* Set if PLT call stubs need a read-read barrier. */
+ unsigned int plt_thread_safe:1;
+
/* Set if we should emit symbols for stubs. */
unsigned int emit_stub_syms:1;
return entry;
}
+struct tocsave_entry {
+ asection *sec;
+ bfd_vma offset;
+};
+
+static hashval_t
+tocsave_htab_hash (const void *p)
+{
+ const struct tocsave_entry *e = (const struct tocsave_entry *) p;
+ return ((bfd_vma)(intptr_t) e->sec ^ e->offset) >> 3;
+}
+
+static int
+tocsave_htab_eq (const void *p1, const void *p2)
+{
+ const struct tocsave_entry *e1 = (const struct tocsave_entry *) p1;
+ const struct tocsave_entry *e2 = (const struct tocsave_entry *) p2;
+ return e1->sec == e2->sec && e1->offset == e2->offset;
+}
+
/* Create a ppc64 ELF linker hash table. */
static struct bfd_link_hash_table *
sizeof (struct ppc_branch_hash_entry)))
return NULL;
+ htab->tocsave_htab = htab_try_create (1024,
+ tocsave_htab_hash,
+ tocsave_htab_eq,
+ NULL);
+ if (htab->tocsave_htab == NULL)
+ return NULL;
+
/* Initializing two fields of the union is just cosmetic. We really
only care about glist, but when compiled on a 32-bit host the
bfd_vma fields are larger. Setting the bfd_vma to zero makes
static void
ppc64_elf_link_hash_table_free (struct bfd_link_hash_table *hash)
{
- struct ppc_link_hash_table *ret = (struct ppc_link_hash_table *) hash;
+ struct ppc_link_hash_table *htab = (struct ppc_link_hash_table *) hash;
- bfd_hash_table_free (&ret->stub_hash_table);
- bfd_hash_table_free (&ret->branch_hash_table);
+ bfd_hash_table_free (&htab->stub_hash_table);
+ bfd_hash_table_free (&htab->branch_hash_table);
+ if (htab->tocsave_htab)
+ htab_delete (htab->tocsave_htab);
_bfd_generic_link_hash_table_free (hash);
}
".eh_frame",
flags);
if (htab->glink_eh_frame == NULL
- || !bfd_set_section_alignment (abfd, htab->glink_eh_frame, 2))
+ || !bfd_set_section_alignment (dynobj, htab->glink_eh_frame, 2))
return FALSE;
}
if (! _bfd_elf_create_got_section (htab->elf.dynobj, info))
return FALSE;
- htab->got = bfd_get_section_by_name (htab->elf.dynobj, ".got");
+ htab->got = bfd_get_linker_section (htab->elf.dynobj, ".got");
if (!htab->got)
abort ();
}
return FALSE;
if (!htab->got)
- htab->got = bfd_get_section_by_name (dynobj, ".got");
- htab->plt = bfd_get_section_by_name (dynobj, ".plt");
- htab->relplt = bfd_get_section_by_name (dynobj, ".rela.plt");
- htab->dynbss = bfd_get_section_by_name (dynobj, ".dynbss");
+ htab->got = bfd_get_linker_section (dynobj, ".got");
+ htab->plt = bfd_get_linker_section (dynobj, ".plt");
+ htab->relplt = bfd_get_linker_section (dynobj, ".rela.plt");
+ htab->dynbss = bfd_get_linker_section (dynobj, ".dynbss");
if (!info->shared)
- htab->relbss = bfd_get_section_by_name (dynobj, ".rela.bss");
+ htab->relbss = bfd_get_linker_section (dynobj, ".rela.bss");
if (!htab->got || !htab->plt || !htab->relplt || !htab->dynbss
|| (!info->shared && !htab->relbss))
edir->elf.ref_regular_nonweak |= eind->elf.ref_regular_nonweak;
edir->elf.needs_plt |= eind->elf.needs_plt;
- /* If we were called to copy over info for a weak sym, that's all. */
- if (eind->elf.root.type != bfd_link_hash_indirect)
- return;
-
/* Copy over any dynamic relocs we may have on the indirect sym. */
if (eind->dyn_relocs != NULL)
{
eind->dyn_relocs = NULL;
}
+ /* If we were called to copy over info for a weak sym, that's all.
+ You might think dyn_relocs need not be copied over; After all,
+ both syms will be dynamic or both non-dynamic so we're just
+ moving reloc accounting around. However, ELIMINATE_COPY_RELOCS
+ code in ppc64_elf_adjust_dynamic_symbol needs to check for
+ dyn_relocs in read-only sections, and it does so on what is the
+ DIR sym here. */
+ if (eind->elf.root.type != bfd_link_hash_indirect)
+ return;
+
/* Copy over got entries that we may have already seen to the
symbol which just became indirect. */
if (eind->elf.got.glist != NULL)
opd_entry_value (asection *opd_sec,
bfd_vma offset,
asection **code_sec,
- bfd_vma *code_off)
+ bfd_vma *code_off,
+ bfd_boolean in_code_sec)
{
bfd *opd_bfd = opd_sec->owner;
Elf_Internal_Rela *relocs;
Elf_Internal_Rela *lo, *hi, *look;
bfd_vma val;
- /* No relocs implies we are linking a --just-symbols object. */
+ /* No relocs implies we are linking a --just-symbols object, or looking
+ at a final linked executable with addr2line or somesuch. */
if (opd_sec->reloc_count == 0)
{
char buf[8];
if (code_sec != NULL)
{
asection *sec, *likely = NULL;
- for (sec = opd_bfd->sections; sec != NULL; sec = sec->next)
- if (sec->vma <= val
- && (sec->flags & SEC_LOAD) != 0
- && (sec->flags & SEC_ALLOC) != 0)
- likely = sec;
+
+ if (in_code_sec)
+ {
+ sec = *code_sec;
+ if (sec->vma <= val
+ && val < sec->vma + sec->size)
+ likely = sec;
+ else
+ val = -1;
+ }
+ else
+ for (sec = opd_bfd->sections; sec != NULL; sec = sec->next)
+ if (sec->vma <= val
+ && (sec->flags & SEC_LOAD) != 0
+ && (sec->flags & SEC_ALLOC) != 0)
+ likely = sec;
if (likely != NULL)
{
*code_sec = likely;
unsigned long symndx = ELF64_R_SYM (look->r_info);
asection *sec;
- if (symndx < symtab_hdr->sh_info)
+ if (symndx < symtab_hdr->sh_info
+ || elf_sym_hashes (opd_bfd) == NULL)
{
Elf_Internal_Sym *sym;
sym = (Elf_Internal_Sym *) symtab_hdr->contents;
if (sym == NULL)
{
- sym = bfd_elf_get_elf_syms (opd_bfd, symtab_hdr,
- symtab_hdr->sh_info,
+ size_t symcnt = symtab_hdr->sh_info;
+ if (elf_sym_hashes (opd_bfd) == NULL)
+ symcnt = symtab_hdr->sh_size / symtab_hdr->sh_entsize;
+ sym = bfd_elf_get_elf_syms (opd_bfd, symtab_hdr, symcnt,
0, NULL, NULL, NULL);
if (sym == NULL)
break;
if (code_off != NULL)
*code_off = val;
if (code_sec != NULL)
- *code_sec = sec;
+ {
+ if (in_code_sec && *code_sec != sec)
+ return -1;
+ else
+ *code_sec = sec;
+ }
if (sec != NULL && sec->output_section != NULL)
val += sec->output_section->vma + sec->output_offset;
}
return val;
}
+/* If the ELF symbol SYM might be a function in SEC, return the
+ function size and set *CODE_OFF to the function's entry point,
+ otherwise return zero. */
+
+static bfd_size_type
+ppc64_elf_maybe_function_sym (const asymbol *sym, asection *sec,
+ bfd_vma *code_off)
+{
+ bfd_size_type size;
+
+ if ((sym->flags & (BSF_SECTION_SYM | BSF_FILE | BSF_OBJECT
+ | BSF_THREAD_LOCAL | BSF_RELC | BSF_SRELC)) != 0)
+ return 0;
+
+ size = 0;
+ if (!(sym->flags & BSF_SYNTHETIC))
+ size = ((elf_symbol_type *) sym)->internal_elf_sym.st_size;
+
+ if (strcmp (sym->section->name, ".opd") == 0)
+ {
+ if (opd_entry_value (sym->section, sym->value,
+ &sec, code_off, TRUE) == (bfd_vma) -1)
+ return 0;
+ /* An old ABI binary with dot-syms has a size of 24 on the .opd
+ symbol. This size has nothing to do with the code size of the
+ function, which is what we're supposed to return, but the
+ code size isn't available without looking up the dot-sym.
+ However, doing that would be a waste of time particularly
+ since elf_find_function will look at the dot-sym anyway.
+ Now, elf_find_function will keep the largest size of any
+ function sym found at the code address of interest, so return
+ 1 here to avoid it incorrectly caching a larger function size
+ for a small function. This does mean we return the wrong
+ size for a new-ABI function of size 24, but all that does is
+ disable caching for such functions. */
+ if (size == 24)
+ size = 1;
+ }
+ else
+ {
+ if (sym->section != sec)
+ return 0;
+ *code_off = sym->value;
+ }
+ if (size == 0)
+ size = 1;
+ return size;
+}
+
/* Return true if symbol is defined in a regular object file. */
static bfd_boolean
else if (get_opd_info (eh->elf.root.u.def.section) != NULL
&& opd_entry_value (eh->elf.root.u.def.section,
eh->elf.root.u.def.value,
- &sec, NULL) != (bfd_vma) -1)
+ &sec, NULL, FALSE) != (bfd_vma) -1)
sec->flags |= SEC_KEEP;
sec = eh->elf.root.u.def.section;
|| (!info->executable
&& eh->elf.def_regular
&& ELF_ST_VISIBILITY (eh->elf.other) != STV_INTERNAL
- && ELF_ST_VISIBILITY (eh->elf.other) != STV_HIDDEN)))
+ && ELF_ST_VISIBILITY (eh->elf.other) != STV_HIDDEN
+ && (strchr (eh->elf.root.root.string, ELF_VER_CHR) != NULL
+ || !bfd_hide_sym_by_version (info->version_info,
+ eh->elf.root.root.string)))))
{
asection *code_sec;
struct ppc_link_hash_entry *fh;
else if (get_opd_info (eh->elf.root.u.def.section) != NULL
&& opd_entry_value (eh->elf.root.u.def.section,
eh->elf.root.u.def.value,
- &code_sec, NULL) != (bfd_vma) -1)
+ &code_sec, NULL, FALSE) != (bfd_vma) -1)
code_sec->flags |= SEC_KEEP;
}
else if (get_opd_info (eh->elf.root.u.def.section) != NULL
&& opd_entry_value (eh->elf.root.u.def.section,
eh->elf.root.u.def.value,
- &rsec, NULL) != (bfd_vma) -1)
+ &rsec, NULL, FALSE) != (bfd_vma) -1)
eh->elf.root.u.def.section->gc_mark = 1;
else
rsec = h->root.u.def.section;
&& opd_entry_value (fdh->elf.root.u.def.section,
fdh->elf.root.u.def.value,
&fh->elf.root.u.def.section,
- &fh->elf.root.u.def.value) != (bfd_vma) -1)
+ &fh->elf.root.u.def.value, FALSE) != (bfd_vma) -1)
{
fh->elf.root.type = fdh->elf.root.type;
fh->elf.forced_local = 1;
{
struct ppc_link_hash_table *htab;
unsigned int i;
- const struct sfpr_def_parms funcs[] =
+ static const struct sfpr_def_parms funcs[] =
{
{ "_savegpr0_", 14, 31, savegpr0, savegpr0_tail },
{ "_restgpr0_", 14, 29, restgpr0, restgpr0_tail },
/* Provide any missing _save* and _rest* functions. */
htab->sfpr->size = 0;
- for (i = 0; i < sizeof (funcs) / sizeof (funcs[0]); i++)
- if (!sfpr_define (info, &funcs[i]))
- return FALSE;
+ if (!info->relocatable)
+ for (i = 0; i < sizeof (funcs) / sizeof (funcs[0]); i++)
+ if (!sfpr_define (info, &funcs[i]))
+ return FALSE;
elf_link_hash_traverse (&htab->elf, func_desc_adjust, info);
/* This is a reference to a symbol defined by a dynamic object which
is not a function. */
- if (h->size == 0)
- {
- info->callbacks->einfo (_("%P: dynamic variable `%s' is zero size\n"),
- h->root.root.string);
- return TRUE;
- }
-
/* We must allocate the symbol in our .dynbss section, which will
become part of the .bss section of the executable. There will be
an entry for this symbol in the .dynsym section. The dynamic
to copy the initial value out of the dynamic object and into the
runtime process image. We need to remember the offset into the
.rela.bss section we are going to use. */
- if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
+ if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
{
htab->relbss->size += sizeof (Elf64_External_Rela);
h->needs_copy = 1;
return 1;
}
+/* Find (or create) an entry in the tocsave hash table. */
+
+static struct tocsave_entry *
+tocsave_find (struct ppc_link_hash_table *htab,
+ enum insert_option insert,
+ Elf_Internal_Sym **local_syms,
+ const Elf_Internal_Rela *irela,
+ bfd *ibfd)
+{
+ unsigned long r_indx;
+ struct elf_link_hash_entry *h;
+ Elf_Internal_Sym *sym;
+ struct tocsave_entry ent, *p;
+ hashval_t hash;
+ struct tocsave_entry **slot;
+
+ r_indx = ELF64_R_SYM (irela->r_info);
+ if (!get_sym_h (&h, &sym, &ent.sec, NULL, local_syms, r_indx, ibfd))
+ return NULL;
+ if (ent.sec == NULL || ent.sec->output_section == NULL)
+ {
+ (*_bfd_error_handler)
+ (_("%B: undefined symbol on R_PPC64_TOCSAVE relocation"));
+ return NULL;
+ }
+
+ if (h != NULL)
+ ent.offset = h->root.u.def.value;
+ else
+ ent.offset = sym->st_value;
+ ent.offset += irela->r_addend;
+
+ hash = tocsave_htab_hash (&ent);
+ slot = ((struct tocsave_entry **)
+ htab_find_slot_with_hash (htab->tocsave_htab, &ent, hash, insert));
+ if (slot == NULL)
+ return NULL;
+
+ if (*slot == NULL)
+ {
+ p = (struct tocsave_entry *) bfd_alloc (ibfd, sizeof (*p));
+ if (p == NULL)
+ return NULL;
+ *p = ent;
+ *slot = p;
+ }
+ return *slot;
+}
+
/* Adjust all global syms defined in opd sections. In gcc generated
code for the old ABI, these will already have been done. */
if (dsec == NULL)
{
for (dsec = sym_sec->owner->sections; dsec; dsec = dsec->next)
- if (elf_discarded_section (dsec))
+ if (discarded_section (dsec))
{
ppc64_elf_tdata (sym_sec->owner)->deleted_section = dsec;
break;
if (sec == NULL || sec->size == 0)
continue;
- if (sec->sec_info_type == ELF_INFO_TYPE_JUST_SYMS)
+ if (sec->sec_info_type == SEC_INFO_TYPE_JUST_SYMS)
continue;
if (sec->output_section == bfd_abs_section_ptr)
return TRUE;
}
+/* Return TRUE iff INSN is one we expect on a _LO variety toc/got reloc. */
+
+static bfd_boolean
+ok_lo_toc_insn (unsigned int insn)
+{
+ return ((insn & (0x3f << 26)) == 14u << 26 /* addi */
+ || (insn & (0x3f << 26)) == 32u << 26 /* lwz */
+ || (insn & (0x3f << 26)) == 34u << 26 /* lbz */
+ || (insn & (0x3f << 26)) == 36u << 26 /* stw */
+ || (insn & (0x3f << 26)) == 38u << 26 /* stb */
+ || (insn & (0x3f << 26)) == 40u << 26 /* lhz */
+ || (insn & (0x3f << 26)) == 42u << 26 /* lha */
+ || (insn & (0x3f << 26)) == 44u << 26 /* sth */
+ || (insn & (0x3f << 26)) == 46u << 26 /* lmw */
+ || (insn & (0x3f << 26)) == 47u << 26 /* stmw */
+ || (insn & (0x3f << 26)) == 48u << 26 /* lfs */
+ || (insn & (0x3f << 26)) == 50u << 26 /* lfd */
+ || (insn & (0x3f << 26)) == 52u << 26 /* stfs */
+ || (insn & (0x3f << 26)) == 54u << 26 /* stfd */
+ || ((insn & (0x3f << 26)) == 58u << 26 /* lwa,ld,lmd */
+ && (insn & 3) != 1)
+ || ((insn & (0x3f << 26)) == 62u << 26 /* std, stmd */
+ && ((insn & 3) == 0 || (insn & 3) == 3))
+ || (insn & (0x3f << 26)) == 12u << 26 /* addic */);
+}
+
/* Examine all relocs referencing .toc sections in order to remove
unused .toc entries. */
toc = bfd_get_section_by_name (ibfd, ".toc");
if (toc == NULL
|| toc->size == 0
- || toc->sec_info_type == ELF_INFO_TYPE_JUST_SYMS
- || elf_discarded_section (toc))
+ || toc->sec_info_type == SEC_INFO_TYPE_JUST_SYMS
+ || discarded_section (toc))
continue;
toc_relocs = NULL;
for (sec = ibfd->sections; sec != NULL; sec = sec->next)
{
if (sec->reloc_count == 0
- || !elf_discarded_section (sec)
+ || !discarded_section (sec)
|| get_opd_info (sec)
|| (sec->flags & SEC_ALLOC) == 0
|| (sec->flags & SEC_DEBUGGING) != 0)
. addi ry,rx,addr@toc@l
when addr is within 2G of the toc pointer. This then means
that the word storing "addr" in the toc is no longer needed. */
-
+
if (!ppc64_elf_tdata (ibfd)->has_small_toc_reloc
&& toc->output_section->rawsize < (bfd_vma) 1 << 31
&& toc->reloc_count != 0)
goto error_ret;
if (sym_sec == NULL
- || elf_discarded_section (sym_sec))
+ || discarded_section (sym_sec))
continue;
if (!SYMBOL_CALLS_LOCAL (info, h))
int repeat;
if (sec->reloc_count == 0
- || elf_discarded_section (sec)
+ || discarded_section (sec)
|| get_opd_info (sec)
|| (sec->flags & SEC_ALLOC) == 0
|| (sec->flags & SEC_DEBUGGING) != 0)
goto error_ret;
/* Mark toc entries referenced as used. */
- repeat = 0;
do
- for (rel = relstart; rel < relstart + sec->reloc_count; ++rel)
- {
- enum elf_ppc64_reloc_type r_type;
- unsigned long r_symndx;
- asection *sym_sec;
- struct elf_link_hash_entry *h;
- Elf_Internal_Sym *sym;
- bfd_vma val;
-
- r_type = ELF64_R_TYPE (rel->r_info);
- switch (r_type)
- {
- default:
- break;
+ {
+ repeat = 0;
+ for (rel = relstart; rel < relstart + sec->reloc_count; ++rel)
+ {
+ enum elf_ppc64_reloc_type r_type;
+ unsigned long r_symndx;
+ asection *sym_sec;
+ struct elf_link_hash_entry *h;
+ Elf_Internal_Sym *sym;
+ bfd_vma val;
+ enum {no_check, check_lo, check_ha} insn_check;
+
+ r_type = ELF64_R_TYPE (rel->r_info);
+ switch (r_type)
+ {
+ default:
+ insn_check = no_check;
+ break;
+
+ case R_PPC64_GOT_TLSLD16_HA:
+ case R_PPC64_GOT_TLSGD16_HA:
+ case R_PPC64_GOT_TPREL16_HA:
+ case R_PPC64_GOT_DTPREL16_HA:
+ case R_PPC64_GOT16_HA:
+ case R_PPC64_TOC16_HA:
+ insn_check = check_ha;
+ break;
+
+ case R_PPC64_GOT_TLSLD16_LO:
+ case R_PPC64_GOT_TLSGD16_LO:
+ case R_PPC64_GOT_TPREL16_LO_DS:
+ case R_PPC64_GOT_DTPREL16_LO_DS:
+ case R_PPC64_GOT16_LO:
+ case R_PPC64_GOT16_LO_DS:
+ case R_PPC64_TOC16_LO:
+ case R_PPC64_TOC16_LO_DS:
+ insn_check = check_lo;
+ break;
+ }
- case R_PPC64_GOT_TLSLD16_HA:
- case R_PPC64_GOT_TLSGD16_HA:
- case R_PPC64_GOT_TPREL16_HA:
- case R_PPC64_GOT_DTPREL16_HA:
- case R_PPC64_GOT16_HA:
- case R_PPC64_TOC16_HA:
+ if (insn_check != no_check)
{
bfd_vma off = rel->r_offset & ~3;
unsigned char buf[4];
goto error_ret;
}
insn = bfd_get_32 (ibfd, buf);
- if ((insn & ((0x3f << 26) | 0x1f << 16))
- != ((15u << 26) | (2 << 16)) /* addis rt,2,imm */)
- ppc64_elf_tdata (ibfd)->ha_relocs_not_using_r2 = 1;
- }
- break;
- }
+ if (insn_check == check_lo
+ ? !ok_lo_toc_insn (insn)
+ : ((insn & ((0x3f << 26) | 0x1f << 16))
+ != ((15u << 26) | (2 << 16)) /* addis rt,2,imm */))
+ {
+ char str[12];
- switch (r_type)
- {
- case R_PPC64_TOC16:
- case R_PPC64_TOC16_LO:
- case R_PPC64_TOC16_HI:
- case R_PPC64_TOC16_HA:
- case R_PPC64_TOC16_DS:
- case R_PPC64_TOC16_LO_DS:
- /* In case we're taking addresses of toc entries. */
- case R_PPC64_ADDR64:
- break;
+ ppc64_elf_tdata (ibfd)->unexpected_toc_insn = 1;
+ sprintf (str, "%#08x", insn);
+ info->callbacks->einfo
+ (_("%P: %H: toc optimization is not supported for"
+ " %s instruction.\n"),
+ ibfd, sec, rel->r_offset & ~3, str);
+ }
+ }
- default:
- continue;
- }
+ switch (r_type)
+ {
+ case R_PPC64_TOC16:
+ case R_PPC64_TOC16_LO:
+ case R_PPC64_TOC16_HI:
+ case R_PPC64_TOC16_HA:
+ case R_PPC64_TOC16_DS:
+ case R_PPC64_TOC16_LO_DS:
+ /* In case we're taking addresses of toc entries. */
+ case R_PPC64_ADDR64:
+ break;
- r_symndx = ELF64_R_SYM (rel->r_info);
- if (!get_sym_h (&h, &sym, &sym_sec, NULL, &local_syms,
- r_symndx, ibfd))
- {
- free (used);
- goto error_ret;
- }
+ default:
+ continue;
+ }
- if (sym_sec != toc)
- continue;
+ r_symndx = ELF64_R_SYM (rel->r_info);
+ if (!get_sym_h (&h, &sym, &sym_sec, NULL, &local_syms,
+ r_symndx, ibfd))
+ {
+ free (used);
+ goto error_ret;
+ }
- if (h != NULL)
- val = h->root.u.def.value;
- else
- val = sym->st_value;
- val += rel->r_addend;
+ if (sym_sec != toc)
+ continue;
- if (val >= toc->size)
- continue;
+ if (h != NULL)
+ val = h->root.u.def.value;
+ else
+ val = sym->st_value;
+ val += rel->r_addend;
- if ((skip[val >> 3] & can_optimize) != 0)
- {
- bfd_vma off;
- unsigned char opc;
+ if (val >= toc->size)
+ continue;
- switch (r_type)
- {
- case R_PPC64_TOC16_HA:
- break;
+ if ((skip[val >> 3] & can_optimize) != 0)
+ {
+ bfd_vma off;
+ unsigned char opc;
- case R_PPC64_TOC16_LO_DS:
- off = rel->r_offset + (bfd_big_endian (ibfd) ? -2 : 3);
- if (!bfd_get_section_contents (ibfd, sec, &opc, off, 1))
- {
- free (used);
- goto error_ret;
- }
- if ((opc & (0x3f << 2)) == (58u << 2))
+ switch (r_type)
+ {
+ case R_PPC64_TOC16_HA:
break;
- /* Fall thru */
- default:
- /* Wrong sort of reloc, or not a ld. We may
- as well clear ref_from_discarded too. */
- skip[val >> 3] = 0;
- }
- }
+ case R_PPC64_TOC16_LO_DS:
+ off = rel->r_offset;
+ off += (bfd_big_endian (ibfd) ? -2 : 3);
+ if (!bfd_get_section_contents (ibfd, sec, &opc,
+ off, 1))
+ {
+ free (used);
+ goto error_ret;
+ }
+ if ((opc & (0x3f << 2)) == (58u << 2))
+ break;
+ /* Fall thru */
- /* For the toc section, we only mark as used if
- this entry itself isn't unused. */
- if (sec == toc
- && !used[val >> 3]
- && (used[rel->r_offset >> 3]
- || !(skip[rel->r_offset >> 3] & ref_from_discarded)))
- /* Do all the relocs again, to catch reference
- chains. */
- repeat = 1;
-
- used[val >> 3] = 1;
- }
+ default:
+ /* Wrong sort of reloc, or not a ld. We may
+ as well clear ref_from_discarded too. */
+ skip[val >> 3] = 0;
+ }
+ }
+
+ if (sec != toc)
+ used[val >> 3] = 1;
+ /* For the toc section, we only mark as used if this
+ entry itself isn't unused. */
+ else if ((used[rel->r_offset >> 3]
+ || !(skip[rel->r_offset >> 3] & ref_from_discarded))
+ && !used[val >> 3])
+ {
+ /* Do all the relocs again, to catch reference
+ chains. */
+ repeat = 1;
+ used[val >> 3] = 1;
+ }
+ }
+ }
while (repeat);
if (elf_section_data (sec)->relocs != relstart)
for (sec = ibfd->sections; sec != NULL; sec = sec->next)
{
if (sec->reloc_count == 0
- || elf_discarded_section (sec))
+ || discarded_section (sec))
continue;
relstart = _bfd_elf_link_read_relocs (ibfd, sec, NULL, NULL,
/* Set the contents of the .interp section to the interpreter. */
if (info->executable)
{
- s = bfd_get_section_by_name (dynobj, ".interp");
+ s = bfd_get_linker_section (dynobj, ".interp");
if (s == NULL)
abort ();
s->size = sizeof ELF_DYNAMIC_INTERPRETER;
return ppc_stub_none;
}
-/* Build a .plt call stub. */
+/* With power7 weakly ordered memory model, it is possible for ld.so
+ to update a plt entry in one thread and have another thread see a
+ stale zero toc entry. To avoid this we need some sort of acquire
+ barrier in the call stub. One solution is to make the load of the
+ toc word seem to appear to depend on the load of the function entry
+ word. Another solution is to test for r2 being zero, and branch to
+ the appropriate glink entry if so.
+
+ . fake dep barrier compare
+ . ld 11,xxx(2) ld 11,xxx(2)
+ . mtctr 11 mtctr 11
+ . xor 11,11,11 ld 2,xxx+8(2)
+ . add 2,2,11 cmpldi 2,0
+ . ld 2,xxx+8(2) bnectr+
+ . bctr b <glink_entry>
+
+ The solution involving the compare turns out to be faster, so
+ that's what we use unless the branch won't reach. */
+
+#define ALWAYS_USE_FAKE_DEP 0
+#define ALWAYS_EMIT_R2SAVE 0
-static inline bfd_byte *
-build_plt_stub (bfd *obfd, bfd_byte *p, int offset, Elf_Internal_Rela *r,
- bfd_boolean plt_static_chain)
-{
#define PPC_LO(v) ((v) & 0xffff)
#define PPC_HI(v) (((v) >> 16) & 0xffff)
#define PPC_HA(v) PPC_HI ((v) + 0x8000)
+static inline unsigned int
+plt_stub_size (struct ppc_link_hash_table *htab,
+ struct ppc_stub_hash_entry *stub_entry,
+ bfd_vma off)
+{
+ unsigned size = PLT_CALL_STUB_SIZE;
+
+ if (!(ALWAYS_EMIT_R2SAVE
+ || stub_entry->stub_type == ppc_stub_plt_call_r2save))
+ size -= 4;
+ if (!htab->plt_static_chain)
+ size -= 4;
+ if (htab->plt_thread_safe)
+ size += 8;
+ if (PPC_HA (off) == 0)
+ size -= 4;
+ if (PPC_HA (off + 8 + 8 * htab->plt_static_chain) != PPC_HA (off))
+ size += 4;
+ if (stub_entry->h != NULL
+ && (stub_entry->h == htab->tls_get_addr_fd
+ || stub_entry->h == htab->tls_get_addr)
+ && !htab->no_tls_get_addr_opt)
+ size += 13 * 4;
+ return size;
+}
+
+/* If this stub would cross fewer 2**plt_stub_align boundaries if we align,
+ then return the padding needed to do so. */
+static inline unsigned int
+plt_stub_pad (struct ppc_link_hash_table *htab,
+ struct ppc_stub_hash_entry *stub_entry,
+ bfd_vma plt_off)
+{
+ int stub_align = 1 << htab->plt_stub_align;
+ unsigned stub_size = plt_stub_size (htab, stub_entry, plt_off);
+ bfd_vma stub_off = stub_entry->stub_sec->size;
+
+ if (((stub_off + stub_size - 1) & -stub_align) - (stub_off & -stub_align)
+ > (stub_size & -stub_align))
+ return stub_align - (stub_off & (stub_align - 1));
+ return 0;
+}
+
+/* Build a .plt call stub. */
+
+static inline bfd_byte *
+build_plt_stub (struct ppc_link_hash_table *htab,
+ struct ppc_stub_hash_entry *stub_entry,
+ bfd_byte *p, bfd_vma offset, Elf_Internal_Rela *r)
+{
+ bfd *obfd = htab->stub_bfd;
+ bfd_boolean plt_static_chain = htab->plt_static_chain;
+ bfd_boolean plt_thread_safe = htab->plt_thread_safe;
+ bfd_boolean use_fake_dep = plt_thread_safe;
+ bfd_vma cmp_branch_off = 0;
+
+ if (!ALWAYS_USE_FAKE_DEP
+ && plt_thread_safe
+ && !(stub_entry->h != NULL
+ && (stub_entry->h == htab->tls_get_addr_fd
+ || stub_entry->h == htab->tls_get_addr)
+ && !htab->no_tls_get_addr_opt))
+ {
+ bfd_vma pltoff = stub_entry->plt_ent->plt.offset & ~1;
+ bfd_vma pltindex = (pltoff - PLT_INITIAL_ENTRY_SIZE) / PLT_ENTRY_SIZE;
+ bfd_vma glinkoff = GLINK_CALL_STUB_SIZE + pltindex * 8;
+ bfd_vma to, from;
+
+ if (pltindex > 32768)
+ glinkoff += (pltindex - 32768) * 4;
+ to = (glinkoff
+ + htab->glink->output_offset
+ + htab->glink->output_section->vma);
+ from = (p - stub_entry->stub_sec->contents
+ + 4 * (ALWAYS_EMIT_R2SAVE
+ || stub_entry->stub_type == ppc_stub_plt_call_r2save)
+ + 4 * (PPC_HA (offset) != 0)
+ + 4 * (PPC_HA (offset + 8 + 8 * plt_static_chain)
+ != PPC_HA (offset))
+ + 4 * (plt_static_chain != 0)
+ + 20
+ + stub_entry->stub_sec->output_offset
+ + stub_entry->stub_sec->output_section->vma);
+ cmp_branch_off = to - from;
+ use_fake_dep = cmp_branch_off + (1 << 25) >= (1 << 26);
+ }
+
if (PPC_HA (offset) != 0)
{
if (r != NULL)
{
+ if (ALWAYS_EMIT_R2SAVE
+ || stub_entry->stub_type == ppc_stub_plt_call_r2save)
+ r[0].r_offset += 4;
r[0].r_info = ELF64_R_INFO (0, R_PPC64_TOC16_HA);
- r[1].r_offset = r[0].r_offset + 8;
+ r[1].r_offset = r[0].r_offset + 4;
r[1].r_info = ELF64_R_INFO (0, R_PPC64_TOC16_LO_DS);
r[1].r_addend = r[0].r_addend;
if (PPC_HA (offset + 8 + 8 * plt_static_chain) != PPC_HA (offset))
}
else
{
- r[2].r_offset = r[1].r_offset + 8;
+ r[2].r_offset = r[1].r_offset + 8 + 8 * use_fake_dep;
r[2].r_info = ELF64_R_INFO (0, R_PPC64_TOC16_LO_DS);
r[2].r_addend = r[0].r_addend + 8;
if (plt_static_chain)
}
}
}
+ if (ALWAYS_EMIT_R2SAVE
+ || stub_entry->stub_type == ppc_stub_plt_call_r2save)
+ bfd_put_32 (obfd, STD_R2_40R1, p), p += 4;
bfd_put_32 (obfd, ADDIS_R12_R2 | PPC_HA (offset), p), p += 4;
- bfd_put_32 (obfd, STD_R2_40R1, p), p += 4;
bfd_put_32 (obfd, LD_R11_0R12 | PPC_LO (offset), p), p += 4;
if (PPC_HA (offset + 8 + 8 * plt_static_chain) != PPC_HA (offset))
{
offset = 0;
}
bfd_put_32 (obfd, MTCTR_R11, p), p += 4;
+ if (use_fake_dep)
+ {
+ bfd_put_32 (obfd, XOR_R11_R11_R11, p), p += 4;
+ bfd_put_32 (obfd, ADD_R12_R12_R11, p), p += 4;
+ }
bfd_put_32 (obfd, LD_R2_0R12 | PPC_LO (offset + 8), p), p += 4;
if (plt_static_chain)
bfd_put_32 (obfd, LD_R11_0R12 | PPC_LO (offset + 16), p), p += 4;
- bfd_put_32 (obfd, BCTR, p), p += 4;
}
else
{
if (r != NULL)
{
- r[0].r_offset += 4;
+ if (ALWAYS_EMIT_R2SAVE
+ || stub_entry->stub_type == ppc_stub_plt_call_r2save)
+ r[0].r_offset += 4;
r[0].r_info = ELF64_R_INFO (0, R_PPC64_TOC16_DS);
if (PPC_HA (offset + 8 + 8 * plt_static_chain) != PPC_HA (offset))
{
}
else
{
- r[1].r_offset = r[0].r_offset + 8;
+ r[1].r_offset = r[0].r_offset + 8 + 8 * use_fake_dep;
r[1].r_info = ELF64_R_INFO (0, R_PPC64_TOC16_DS);
r[1].r_addend = r[0].r_addend + 8 + 8 * plt_static_chain;
if (plt_static_chain)
}
}
}
- bfd_put_32 (obfd, STD_R2_40R1, p), p += 4;
+ if (ALWAYS_EMIT_R2SAVE
+ || stub_entry->stub_type == ppc_stub_plt_call_r2save)
+ bfd_put_32 (obfd, STD_R2_40R1, p), p += 4;
bfd_put_32 (obfd, LD_R11_0R2 | PPC_LO (offset), p), p += 4;
if (PPC_HA (offset + 8 + 8 * plt_static_chain) != PPC_HA (offset))
{
offset = 0;
}
bfd_put_32 (obfd, MTCTR_R11, p), p += 4;
+ if (use_fake_dep)
+ {
+ bfd_put_32 (obfd, XOR_R11_R11_R11, p), p += 4;
+ bfd_put_32 (obfd, ADD_R2_R2_R11, p), p += 4;
+ }
if (plt_static_chain)
bfd_put_32 (obfd, LD_R11_0R2 | PPC_LO (offset + 16), p), p += 4;
bfd_put_32 (obfd, LD_R2_0R2 | PPC_LO (offset + 8), p), p += 4;
- bfd_put_32 (obfd, BCTR, p), p += 4;
}
+ if (plt_thread_safe && !use_fake_dep)
+ {
+ bfd_put_32 (obfd, CMPLDI_R2_0, p), p += 4;
+ bfd_put_32 (obfd, BNECTR_P4, p), p += 4;
+ bfd_put_32 (obfd, B_DOT + cmp_branch_off, p), p += 4;
+ }
+ else
+ bfd_put_32 (obfd, BCTR, p), p += 4;
return p;
}
#define MTLR_R11 0x7d6803a6
static inline bfd_byte *
-build_tls_get_addr_stub (bfd *obfd, bfd_byte *p, int offset,
- Elf_Internal_Rela *r, bfd_boolean plt_static_chain)
+build_tls_get_addr_stub (struct ppc_link_hash_table *htab,
+ struct ppc_stub_hash_entry *stub_entry,
+ bfd_byte *p, bfd_vma offset, Elf_Internal_Rela *r)
{
+ bfd *obfd = htab->stub_bfd;
+
bfd_put_32 (obfd, LD_R11_0R3 + 0, p), p += 4;
bfd_put_32 (obfd, LD_R12_0R3 + 8, p), p += 4;
bfd_put_32 (obfd, MR_R0_R3, p), p += 4;
if (r != NULL)
r[0].r_offset += 9 * 4;
- p = build_plt_stub (obfd, p, offset, r, plt_static_chain);
+ p = build_plt_stub (htab, stub_entry, p, offset, r);
bfd_put_32 (obfd, BCTRL, p - 4);
bfd_put_32 (obfd, LD_R11_0R1 + 32, p), p += 4;
break;
case ppc_stub_plt_call:
+ case ppc_stub_plt_call_r2save:
if (stub_entry->h != NULL
&& stub_entry->h->is_func_descriptor
&& stub_entry->h->oh != NULL)
return FALSE;
}
+ if (htab->plt_stub_align != 0)
+ {
+ unsigned pad = plt_stub_pad (htab, stub_entry, off);
+
+ stub_entry->stub_sec->size += pad;
+ stub_entry->stub_offset = stub_entry->stub_sec->size;
+ loc += pad;
+ }
+
r = NULL;
if (info->emitrelocations)
{
&& (stub_entry->h == htab->tls_get_addr_fd
|| stub_entry->h == htab->tls_get_addr)
&& !htab->no_tls_get_addr_opt)
- p = build_tls_get_addr_stub (htab->stub_bfd, loc, off, r,
- htab->plt_static_chain);
+ p = build_tls_get_addr_stub (htab, stub_entry, loc, off, r);
else
- p = build_plt_stub (htab->stub_bfd, loc, off, r,
- htab->plt_static_chain);
+ p = build_plt_stub (htab, stub_entry, loc, off, r);
size = p - loc;
break;
"long_branch_r2off",
"plt_branch",
"plt_branch_r2off",
+ "plt_call",
"plt_call" };
len1 = strlen (stub_str[stub_entry->stub_type - 1]);
if (htab == NULL)
return FALSE;
- if (stub_entry->stub_type == ppc_stub_plt_call)
+ if (stub_entry->stub_type == ppc_stub_plt_call
+ || stub_entry->stub_type == ppc_stub_plt_call_r2save)
{
asection *plt;
off = stub_entry->plt_ent->plt.offset & ~(bfd_vma) 1;
- elf_gp (plt->output_section->owner)
- htab->stub_group[stub_entry->id_sec->id].toc_off);
- size = PLT_CALL_STUB_SIZE;
- if (!htab->plt_static_chain)
- size -= 4;
- if (PPC_HA (off) == 0)
- size -= 4;
- if (PPC_HA (off + 8 + 8 * htab->plt_static_chain) != PPC_HA (off))
- size += 4;
- if (stub_entry->h != NULL
- && (stub_entry->h == htab->tls_get_addr_fd
- || stub_entry->h == htab->tls_get_addr)
- && !htab->no_tls_get_addr_opt)
- size += 13 * 4;
+ size = plt_stub_size (htab, stub_entry, off);
+ if (htab->plt_stub_align)
+ size += plt_stub_pad (htab, stub_entry, off);
if (info->emitrelocations)
{
stub_entry->stub_sec->reloc_count
if (!htab->second_toc_pass)
{
/* Keep track of the first .toc or .got section for this input bfd. */
- if (htab->toc_bfd != isec->owner)
+ bfd_boolean new_bfd = htab->toc_bfd != isec->owner;
+
+ if (new_bfd)
{
htab->toc_bfd = isec->owner;
htab->toc_first_sec = isec;
/* Die if someone uses a linker script that doesn't keep input
file .toc and .got together. */
- if (elf_gp (isec->owner) != 0
+ if (new_bfd
+ && elf_gp (isec->owner) != 0
&& elf_gp (isec->owner) != off)
return FALSE;
sym_value += adjust;
}
- dest = opd_entry_value (sym_sec, sym_value, &sym_sec, NULL);
+ dest = opd_entry_value (sym_sec, sym_value,
+ &sym_sec, NULL, FALSE);
if (dest == (bfd_vma) -1)
continue;
}
{
if (isec->size == 0
&& isec->output_section->size == 0
+ && !(isec->output_section->flags & SEC_KEEP)
&& !bfd_section_removed_from_list (info->output_bfd,
isec->output_section)
&& elf_section_data (isec->output_section)->dynindx == 0)
bfd_boolean
ppc64_elf_size_stubs (struct bfd_link_info *info, bfd_signed_vma group_size,
- bfd_boolean plt_static_chain)
+ bfd_boolean plt_static_chain, int plt_thread_safe,
+ int plt_stub_align)
{
bfd_size_type stub_group_size;
bfd_boolean stubs_always_before_branch;
return FALSE;
htab->plt_static_chain = plt_static_chain;
+ htab->plt_stub_align = plt_stub_align;
+ if (plt_thread_safe == -1)
+ {
+ const char *const thread_starter[] =
+ {
+ "pthread_create",
+ /* libstdc++ */
+ "_ZNSt6thread15_M_start_threadESt10shared_ptrINS_10_Impl_baseEE",
+ /* librt */
+ "aio_init", "aio_read", "aio_write", "aio_fsync", "lio_listio",
+ "mq_notify", "create_timer",
+ /* libanl */
+ "getaddrinfo_a",
+ /* libgomp */
+ "GOMP_parallel_start",
+ "GOMP_parallel_loop_static_start",
+ "GOMP_parallel_loop_dynamic_start",
+ "GOMP_parallel_loop_guided_start",
+ "GOMP_parallel_loop_runtime_start",
+ "GOMP_parallel_sections_start",
+ };
+ unsigned i;
+
+ for (i = 0; i < sizeof (thread_starter)/ sizeof (thread_starter[0]); i++)
+ {
+ struct elf_link_hash_entry *h;
+ h = elf_link_hash_lookup (&htab->elf, thread_starter[i],
+ FALSE, FALSE, TRUE);
+ plt_thread_safe = h != NULL && h->ref_regular;
+ if (plt_thread_safe)
+ break;
+ }
+ }
+ htab->plt_thread_safe = plt_thread_safe;
+ htab->dot_toc_dot = ((struct ppc_link_hash_entry *)
+ elf_link_hash_lookup (&htab->elf, ".TOC.",
+ FALSE, FALSE, TRUE));
stubs_always_before_branch = group_size < 0;
if (group_size < 0)
stub_group_size = -group_size;
sym_value += adjust;
}
dest = opd_entry_value (sym_sec, sym_value,
- &code_sec, &code_value);
+ &code_sec, &code_value, FALSE);
if (dest != (bfd_vma) -1)
{
destination = dest;
continue;
}
+ if (stub_type == ppc_stub_plt_call
+ && irela + 1 < irelaend
+ && irela[1].r_offset == irela->r_offset + 4
+ && ELF64_R_TYPE (irela[1].r_info) == R_PPC64_TOCSAVE)
+ {
+ if (!tocsave_find (htab, INSERT,
+ &local_syms, irela + 1, input_bfd))
+ goto error_ret_free_internal;
+ }
+ else if (stub_type == ppc_stub_plt_call)
+ stub_type = ppc_stub_plt_call_r2save;
+
/* Support for grouping stub sections. */
id_sec = htab->stub_group[section->id].link_sec;
{
/* The proper stub has already been created. */
free (stub_name);
+ if (stub_type == ppc_stub_plt_call_r2save)
+ stub_entry->stub_type = stub_type;
continue;
}
}
stub_entry->stub_type = stub_type;
- if (stub_type != ppc_stub_plt_call)
+ if (stub_type != ppc_stub_plt_call
+ && stub_type != ppc_stub_plt_call_r2save)
{
stub_entry->target_value = code_value;
stub_entry->target_section = code_sec;
if (htab->glink_eh_frame != NULL
&& !bfd_is_abs_section (htab->glink_eh_frame->output_section)
- && (htab->glink_eh_frame->flags & SEC_EXCLUDE) == 0)
+ && htab->glink_eh_frame->output_section->size != 0)
{
- bfd_size_type size = 0;
+ size_t size = 0, align;
for (stub_sec = htab->stub_bfd->sections;
stub_sec != NULL;
size += 24;
if (size != 0)
size += sizeof (glink_eh_frame_cie);
+ align = 1;
+ align <<= htab->glink_eh_frame->output_section->alignment_power;
+ align -= 1;
+ size = (size + align) & ~align;
htab->glink_eh_frame->rawsize = htab->glink_eh_frame->size;
htab->glink_eh_frame->size = size;
}
+ if (htab->plt_stub_align != 0)
+ for (stub_sec = htab->stub_bfd->sections;
+ stub_sec != NULL;
+ stub_sec = stub_sec->next)
+ if ((stub_sec->flags & SEC_LINKER_CREATED) == 0)
+ stub_sec->size = ((stub_sec->size + (1 << htab->plt_stub_align) - 1)
+ & (-1 << htab->plt_stub_align));
+
for (stub_sec = htab->stub_bfd->sections;
stub_sec != NULL;
stub_sec = stub_sec->next)
&& htab->glink_eh_frame->size != 0)
{
bfd_vma val;
+ bfd_byte *last_fde;
+ size_t last_fde_len, size, align, pad;
p = bfd_zalloc (htab->glink_eh_frame->owner, htab->glink_eh_frame->size);
if (p == NULL)
return FALSE;
htab->glink_eh_frame->contents = p;
+ last_fde = p;
htab->glink_eh_frame->rawsize = htab->glink_eh_frame->size;
memcpy (p, glink_eh_frame_cie, sizeof (glink_eh_frame_cie));
/* CIE length (rewrite in case little-endian). */
- bfd_put_32 (htab->elf.dynobj, sizeof (glink_eh_frame_cie) - 4, p);
+ last_fde_len = sizeof (glink_eh_frame_cie) - 4;
+ bfd_put_32 (htab->elf.dynobj, last_fde_len, p);
p += sizeof (glink_eh_frame_cie);
for (stub_sec = htab->stub_bfd->sections;
stub_sec = stub_sec->next)
if ((stub_sec->flags & SEC_LINKER_CREATED) == 0)
{
+ last_fde = p;
+ last_fde_len = 16;
/* FDE length. */
bfd_put_32 (htab->elf.dynobj, 16, p);
p += 4;
}
if (htab->glink != NULL && htab->glink->size != 0)
{
+ last_fde = p;
+ last_fde_len = 20;
/* FDE length. */
bfd_put_32 (htab->elf.dynobj, 20, p);
p += 4;
*p++ = DW_CFA_restore_extended;
*p++ = 65;
}
- htab->glink_eh_frame->size = p - htab->glink_eh_frame->contents;
+ /* Subsume any padding into the last FDE if user .eh_frame
+ sections are aligned more than glink_eh_frame. Otherwise any
+ zero padding will be seen as a terminator. */
+ size = p - htab->glink_eh_frame->contents;
+ align = 1;
+ align <<= htab->glink_eh_frame->output_section->alignment_power;
+ align -= 1;
+ pad = ((size + align) & ~align) - size;
+ htab->glink_eh_frame->size = size + pad;
+ bfd_put_32 (htab->elf.dynobj, last_fde_len + pad, last_fde);
}
/* Build the stubs as directed by the stub hash table. */
if (htab->relbrlt != NULL)
htab->relbrlt->reloc_count = 0;
+ if (htab->plt_stub_align != 0)
+ for (stub_sec = htab->stub_bfd->sections;
+ stub_sec != NULL;
+ stub_sec = stub_sec->next)
+ if ((stub_sec->flags & SEC_LINKER_CREATED) == 0)
+ stub_sec->size = ((stub_sec->size + (1 << htab->plt_stub_align) - 1)
+ & (-1 << htab->plt_stub_align));
+
for (stub_sec = htab->stub_bfd->sections;
stub_sec != NULL;
stub_sec = stub_sec->next)
" toc adjust %lu\n"
" long branch %lu\n"
" long toc adj %lu\n"
- " plt call %lu"),
+ " plt call %lu\n"
+ " plt call toc %lu"),
stub_sec_count,
stub_sec_count == 1 ? "" : "s",
htab->stub_count[ppc_stub_long_branch - 1],
htab->stub_count[ppc_stub_long_branch_r2off - 1],
htab->stub_count[ppc_stub_plt_branch - 1],
htab->stub_count[ppc_stub_plt_branch_r2off - 1],
- htab->stub_count[ppc_stub_plt_call - 1]);
+ htab->stub_count[ppc_stub_plt_call - 1],
+ htab->stub_count[ppc_stub_plt_call_r2save - 1]);
}
return TRUE;
}
bfd_vma TOCstart;
bfd_boolean ret = TRUE;
bfd_boolean is_opd;
- /* Disabled until we sort out how ld should choose 'y' vs 'at'. */
- bfd_boolean is_power4 = FALSE;
+ /* Assume 'at' branch hints. */
+ bfd_boolean is_isa_v2 = TRUE;
bfd_vma d_offset = (bfd_big_endian (output_bfd) ? 2 : 0);
/* Initialize howto table if needed. */
for (; rel < relend; rel++)
{
enum elf_ppc64_reloc_type r_type;
- bfd_vma addend, orig_addend;
+ bfd_vma addend;
bfd_reloc_status_type r;
Elf_Internal_Sym *sym;
asection *sec;
struct ppc_stub_hash_entry *stub_entry;
bfd_vma max_br_offset;
bfd_vma from;
+ const Elf_Internal_Rela orig_rel = *rel;
r_type = ELF64_R_TYPE (rel->r_info);
r_symndx = ELF64_R_SYM (rel->r_info);
sym_name = NULL;
unresolved_reloc = FALSE;
warned = FALSE;
- orig_addend = rel->r_addend;
if (r_symndx < symtab_hdr->sh_info)
{
unresolved_reloc, warned);
sym_name = h_elf->root.root.string;
sym_type = h_elf->type;
+ if (sec != NULL
+ && sec->owner == output_bfd
+ && strcmp (sec->name, ".opd") == 0)
+ {
+ /* This is a symbol defined in a linker script. All
+ such are defined in output sections, even those
+ defined by simple assignment from a symbol defined in
+ an input section. Transfer the symbol to an
+ appropriate input .opd section, so that a branch to
+ this symbol will be mapped to the location specified
+ by the opd entry. */
+ struct bfd_link_order *lo;
+ for (lo = sec->map_head.link_order; lo != NULL; lo = lo->next)
+ if (lo->type == bfd_indirect_link_order)
+ {
+ asection *isec = lo->u.indirect.section;
+ if (h_elf->root.u.def.value >= isec->output_offset
+ && h_elf->root.u.def.value < (isec->output_offset
+ + isec->size))
+ {
+ h_elf->root.u.def.value -= isec->output_offset;
+ h_elf->root.u.def.section = isec;
+ sec = isec;
+ break;
+ }
+ }
+ }
+ if (h_elf == &htab->dot_toc_dot->elf)
+ {
+ relocation = (TOCstart
+ + htab->stub_group[input_section->id].toc_off);
+ sec = bfd_abs_section_ptr;
+ unresolved_reloc = FALSE;
+ }
}
h = (struct ppc_link_hash_entry *) h_elf;
- if (sec != NULL && elf_discarded_section (sec))
+ if (sec != NULL && discarded_section (sec))
RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
- rel, relend,
- ppc64_elf_howto_table[r_type],
+ rel, 1, relend,
+ ppc64_elf_howto_table[r_type], 0,
contents);
if (info->relocatable)
default:
break;
+ case R_PPC64_TOCSAVE:
+ if (relocation + addend == (rel->r_offset
+ + input_section->output_offset
+ + input_section->output_section->vma)
+ && tocsave_find (htab, NO_INSERT,
+ &local_syms, rel, input_bfd))
+ {
+ insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
+ if (insn == NOP
+ || insn == CROR_151515 || insn == CROR_313131)
+ bfd_put_32 (input_bfd, STD_R2_40R1,
+ contents + rel->r_offset);
+ }
+ break;
+
/* Branch taken prediction relocations. */
case R_PPC64_ADDR14_BRTAKEN:
case R_PPC64_REL14_BRTAKEN:
&& h->oh != NULL
&& h->oh->is_func_descriptor)
fdh = ppc_follow_link (h->oh);
- stub_entry = ppc_get_stub_entry (input_section, sec, fdh, rel, htab);
+ stub_entry = ppc_get_stub_entry (input_section, sec, fdh, &orig_rel,
+ htab);
if (stub_entry != NULL
&& (stub_entry->stub_type == ppc_stub_plt_call
+ || stub_entry->stub_type == ppc_stub_plt_call_r2save
|| stub_entry->stub_type == ppc_stub_plt_branch_r2off
|| stub_entry->stub_type == ppc_stub_long_branch_r2off))
{
if (!can_plt_call)
{
- if (stub_entry->stub_type == ppc_stub_plt_call)
+ if (stub_entry->stub_type == ppc_stub_plt_call
+ || stub_entry->stub_type == ppc_stub_plt_call_r2save)
{
/* If this is a plain branch rather than a branch
and link, don't require a nop. However, don't
}
if (can_plt_call
- && stub_entry->stub_type == ppc_stub_plt_call)
+ && (stub_entry->stub_type == ppc_stub_plt_call
+ || stub_entry->stub_type == ppc_stub_plt_call_r2save))
unresolved_reloc = FALSE;
}
bfd_vma off = (relocation + addend
- sec->output_section->vma
- sec->output_offset);
- bfd_vma dest = opd_entry_value (sec, off, NULL, NULL);
+ bfd_vma dest = opd_entry_value (sec, off, NULL, NULL, FALSE);
if (dest != (bfd_vma) -1)
{
relocation = dest;
+ stub_entry->stub_sec->output_offset
+ stub_entry->stub_sec->output_section->vma);
addend = 0;
+
+ if ((stub_entry->stub_type == ppc_stub_plt_call
+ || stub_entry->stub_type == ppc_stub_plt_call_r2save)
+ && (ALWAYS_EMIT_R2SAVE
+ || stub_entry->stub_type == ppc_stub_plt_call_r2save)
+ && rel + 1 < relend
+ && rel[1].r_offset == rel->r_offset + 4
+ && ELF64_R_TYPE (rel[1].r_info) == R_PPC64_TOCSAVE)
+ relocation += 4;
}
if (insn != 0)
{
- if (is_power4)
+ if (is_isa_v2)
{
/* Set 'a' bit. This is 0b00010 in BO field for branch
on CR(BI) insns (BO == 001at or 011at), and 0b01000
case R_PPC64_TLS:
case R_PPC64_TLSGD:
case R_PPC64_TLSLD:
+ case R_PPC64_TOCSAVE:
case R_PPC64_GNU_VTINHERIT:
case R_PPC64_GNU_VTENTRY:
continue;
;
else
{
+ BFD_ASSERT (h->elf.dynindx != -1);
indx = h->elf.dynindx;
unresolved_reloc = FALSE;
}
}
for (; ent != NULL; ent = ent->next)
- if (ent->addend == orig_addend
+ if (ent->addend == orig_rel.r_addend
&& ent->owner == input_bfd
&& ent->tls_type == tls_type)
break;
{
struct plt_entry *ent;
for (ent = h->elf.plt.plist; ent != NULL; ent = ent->next)
- if (ent->addend == orig_addend
+ if (ent->addend == orig_rel.r_addend
&& ent->plt.offset != (bfd_vma) -1)
{
relocation = (htab->plt->output_section->vma
else if (!SYMBOL_CALLS_LOCAL (info, &h->elf)
&& !is_opd
&& r_type != R_PPC64_TOC)
- outrel.r_info = ELF64_R_INFO (h->elf.dynindx, r_type);
+ {
+ BFD_ASSERT (h->elf.dynindx != -1);
+ outrel.r_info = ELF64_R_INFO (h->elf.dynindx, r_type);
+ }
else
{
/* This symbol is local, or marked to become local,
case R_PPC64_GOT16_HA:
case R_PPC64_TOC16_HA:
if (htab->do_toc_opt && relocation + addend + 0x8000 < 0x10000
- && !ppc64_elf_tdata (input_bfd)->ha_relocs_not_using_r2)
+ && !ppc64_elf_tdata (input_bfd)->unexpected_toc_insn)
{
bfd_byte *p = contents + (rel->r_offset & ~3);
bfd_put_32 (input_bfd, NOP, p);
case R_PPC64_TOC16_LO:
case R_PPC64_TOC16_LO_DS:
if (htab->do_toc_opt && relocation + addend + 0x8000 < 0x10000
- && !ppc64_elf_tdata (input_bfd)->ha_relocs_not_using_r2)
+ && !ppc64_elf_tdata (input_bfd)->unexpected_toc_insn)
{
bfd_byte *p = contents + (rel->r_offset & ~3);
insn = bfd_get_32 (input_bfd, p);
- if ((insn & (0x3f << 26)) == 14u << 26 /* addi */
- || (insn & (0x3f << 26)) == 32u << 26 /* lwz */
- || (insn & (0x3f << 26)) == 34u << 26 /* lbz */
- || (insn & (0x3f << 26)) == 36u << 26 /* stw */
- || (insn & (0x3f << 26)) == 38u << 26 /* stb */
- || (insn & (0x3f << 26)) == 40u << 26 /* lhz */
- || (insn & (0x3f << 26)) == 42u << 26 /* lha */
- || (insn & (0x3f << 26)) == 44u << 26 /* sth */
- || (insn & (0x3f << 26)) == 46u << 26 /* lmw */
- || (insn & (0x3f << 26)) == 47u << 26 /* stmw */
- || (insn & (0x3f << 26)) == 48u << 26 /* lfs */
- || (insn & (0x3f << 26)) == 50u << 26 /* lfd */
- || (insn & (0x3f << 26)) == 52u << 26 /* stfs */
- || (insn & (0x3f << 26)) == 54u << 26 /* stfd */
- || ((insn & (0x3f << 26)) == 58u << 26 /* lwa,ld,lmd */
- && (insn & 3) != 1)
- || ((insn & (0x3f << 26)) == 62u << 26 /* std, stmd */
- && ((insn & 3) == 0 || (insn & 3) == 3)))
+ if ((insn & (0x3f << 26)) == 12u << 26 /* addic */)
+ {
+ /* Transform addic to addi when we change reg. */
+ insn &= ~((0x3f << 26) | (0x1f << 16));
+ insn |= (14u << 26) | (2 << 16);
+ }
+ else
{
insn &= ~(0x1f << 16);
insn |= 2 << 16;
- bfd_put_32 (input_bfd, insn, p);
}
+ bfd_put_32 (input_bfd, insn, p);
}
break;
}
not process them. */
if (unresolved_reloc
&& !((input_section->flags & SEC_DEBUGGING) != 0
- && h->elf.def_dynamic))
+ && h->elf.def_dynamic)
+ && _bfd_elf_section_offset (output_bfd, info, input_section,
+ rel->r_offset) != (bfd_vma) -1)
{
info->callbacks->einfo
(_("%P: %H: unresolvable %s relocation against symbol `%s'\n"),
if (!((*info->callbacks->reloc_overflow)
(info, (h ? &h->elf.root : NULL), sym_name,
ppc64_elf_howto_table[r_type]->name,
- orig_addend, input_bfd, input_section, rel->r_offset)))
+ orig_rel.r_addend, input_bfd, input_section,
+ rel->r_offset)))
return FALSE;
}
else
ppc64_elf_finish_dynamic_symbol (bfd *output_bfd,
struct bfd_link_info *info,
struct elf_link_hash_entry *h,
- Elf_Internal_Sym *sym)
+ Elf_Internal_Sym *sym ATTRIBUTE_UNUSED)
{
struct ppc_link_hash_table *htab;
struct plt_entry *ent;
bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
}
- /* Mark some specially defined symbols as absolute. */
- if (strcmp (h->root.root.string, "_DYNAMIC") == 0)
- sym->st_shndx = SHN_ABS;
-
return TRUE;
}
return FALSE;
dynobj = htab->elf.dynobj;
- sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
+ sdyn = bfd_get_linker_section (dynobj, ".dynamic");
if (htab->elf.dynamic_sections_created)
{
if (htab->glink_eh_frame != NULL
- && htab->glink_eh_frame->sec_info_type == ELF_INFO_TYPE_EH_FRAME
+ && htab->glink_eh_frame->sec_info_type == SEC_INFO_TYPE_EH_FRAME
&& !_bfd_elf_write_section_eh_frame (output_bfd, info,
htab->glink_eh_frame,
htab->glink_eh_frame->contents))
}
#include "elf64-target.h"
+
+/* FreeBSD support */
+
+#undef TARGET_LITTLE_SYM
+#undef TARGET_LITTLE_NAME
+
+#undef TARGET_BIG_SYM
+#define TARGET_BIG_SYM bfd_elf64_powerpc_freebsd_vec
+#undef TARGET_BIG_NAME
+#define TARGET_BIG_NAME "elf64-powerpc-freebsd"
+
+#undef ELF_OSABI
+#define ELF_OSABI ELFOSABI_FREEBSD
+
+#undef elf64_bed
+#define elf64_bed elf64_powerpc_fbsd_bed
+
+#include "elf64-target.h"
+
projects / deliverable / binutils-gdb.git / blobdiff