/* AArch64-specific support for NN-bit ELF.
- Copyright (C) 2009-2016 Free Software Foundation, Inc.
+ Copyright (C) 2009-2017 Free Software Foundation, Inc.
Contributed by ARM Ltd.
This file is part of BFD, the Binary File Descriptor library.
#define PLT_SMALL_ENTRY_SIZE (16)
#define PLT_TLSDESC_ENTRY_SIZE (32)
-/* Encoding of the nop instruction */
+/* Encoding of the nop instruction. */
#define INSN_NOP 0xd503201f
#define aarch64_compute_jump_table_size(htab) \
return stub_name;
}
+/* Return TRUE if symbol H should be hashed in the `.gnu.hash' section. For
+ executable PLT slots where the executable never takes the address of those
+ functions, the function symbols are not added to the hash table. */
+
+static bfd_boolean
+elf_aarch64_hash_symbol (struct elf_link_hash_entry *h)
+{
+ if (h->plt.offset != (bfd_vma) -1
+ && !h->def_regular
+ && !h->pointer_equality_needed)
+ return FALSE;
+
+ return _bfd_elf_hash_symbol (h);
+}
+
+
/* Look up an entry in the stub hash. Stub entries are cached because
creating the stub name takes a bit of time. */
For scalar LD/ST instructions PAIR is FALSE, RT is returned and RT2
is set equal to RT.
- For LD/ST pair instructions PAIR is TRUE, RT and RT2 are returned.
-
- */
+ For LD/ST pair instructions PAIR is TRUE, RT and RT2 are returned. */
static bfd_boolean
aarch64_mem_op_p (uint32_t insn, unsigned int *rt, unsigned int *rt2,
howto, value);
}
+/* LP64 and ILP32 operates on x- and w-registers respectively.
+ Next definitions take into account the difference between
+ corresponding machine codes. R means x-register if the target
+ arch is LP64, and w-register if the target is ILP32. */
+
+#if ARCH_SIZE == 64
+# define add_R0_R0 (0x91000000)
+# define add_R0_R0_R1 (0x8b000020)
+# define add_R0_R1 (0x91400020)
+# define ldr_R0 (0x58000000)
+# define ldr_R0_mask(i) (i & 0xffffffe0)
+# define ldr_R0_x0 (0xf9400000)
+# define ldr_hw_R0 (0xf2a00000)
+# define movk_R0 (0xf2800000)
+# define movz_R0 (0xd2a00000)
+# define movz_hw_R0 (0xd2c00000)
+#else /*ARCH_SIZE == 32 */
+# define add_R0_R0 (0x11000000)
+# define add_R0_R0_R1 (0x0b000020)
+# define add_R0_R1 (0x11400020)
+# define ldr_R0 (0x18000000)
+# define ldr_R0_mask(i) (i & 0xbfffffe0)
+# define ldr_R0_x0 (0xb9400000)
+# define ldr_hw_R0 (0x72a00000)
+# define movk_R0 (0x72800000)
+# define movz_R0 (0x52a00000)
+# define movz_hw_R0 (0x52c00000)
+#endif
+
/* Handle TLS relaxations. Relaxing is possible for symbols that use
R_AARCH64_TLSDESC_ADR_{PAGE, LD64_LO12_NC, ADD_LO12_NC} during a static
link.
if (is_local)
{
/* GD->LE relaxation:
- adrp x0, :tlsgd:var => movz x0, :tprel_g1:var
+ adrp x0, :tlsgd:var => movz R0, :tprel_g1:var
or
- adrp x0, :tlsdesc:var => movz x0, :tprel_g1:var
- */
- bfd_putl32 (0xd2a00000, contents + rel->r_offset);
+ adrp x0, :tlsdesc:var => movz R0, :tprel_g1:var
+
+ Where R is x for LP64, and w for ILP32. */
+ bfd_putl32 (movz_R0, contents + rel->r_offset);
return bfd_reloc_continue;
}
else
if (is_local)
{
/* Tiny TLSDESC->LE relaxation:
- ldr x1, :tlsdesc:var => movz x0, #:tprel_g1:var
- adr x0, :tlsdesc:var => movk x0, #:tprel_g0_nc:var
+ ldr x1, :tlsdesc:var => movz R0, #:tprel_g1:var
+ adr x0, :tlsdesc:var => movk R0, #:tprel_g0_nc:var
.tlsdesccall var
blr x1 => nop
- */
+
+ Where R is x for LP64, and w for ILP32. */
BFD_ASSERT (ELFNN_R_TYPE (rel[1].r_info) == AARCH64_R (TLSDESC_ADR_PREL21));
BFD_ASSERT (ELFNN_R_TYPE (rel[2].r_info) == AARCH64_R (TLSDESC_CALL));
AARCH64_R (TLSLE_MOVW_TPREL_G0_NC));
rel[2].r_info = ELFNN_R_INFO (STN_UNDEF, R_AARCH64_NONE);
- bfd_putl32 (0xd2a00000, contents + rel->r_offset);
- bfd_putl32 (0xf2800000, contents + rel->r_offset + 4);
+ bfd_putl32 (movz_R0, contents + rel->r_offset);
+ bfd_putl32 (movk_R0, contents + rel->r_offset + 4);
bfd_putl32 (INSN_NOP, contents + rel->r_offset + 8);
return bfd_reloc_continue;
}
rel[1].r_info = ELFNN_R_INFO (STN_UNDEF, R_AARCH64_NONE);
rel[2].r_info = ELFNN_R_INFO (STN_UNDEF, R_AARCH64_NONE);
- bfd_putl32 (0x58000000, contents + rel->r_offset);
+ bfd_putl32 (ldr_R0, contents + rel->r_offset);
bfd_putl32 (INSN_NOP, contents + rel->r_offset + 4);
bfd_putl32 (INSN_NOP, contents + rel->r_offset + 8);
return bfd_reloc_continue;
{
/* Tiny GD->LE relaxation:
adr x0, :tlsgd:var => mrs x1, tpidr_el0
- bl __tls_get_addr => add x0, x1, #:tprel_hi12:x, lsl #12
- nop => add x0, x0, #:tprel_lo12_nc:x
- */
+ bl __tls_get_addr => add R0, R1, #:tprel_hi12:x, lsl #12
+ nop => add R0, R0, #:tprel_lo12_nc:x
+
+ Where R is x for LP64, and x for Ilp32. */
/* First kill the tls_get_addr reloc on the bl instruction. */
BFD_ASSERT (rel->r_offset + 4 == rel[1].r_offset);
bfd_putl32 (0xd53bd041, contents + rel->r_offset + 0);
- bfd_putl32 (0x91400020, contents + rel->r_offset + 4);
- bfd_putl32 (0x91000000, contents + rel->r_offset + 8);
+ bfd_putl32 (add_R0_R1, contents + rel->r_offset + 4);
+ bfd_putl32 (add_R0_R0, contents + rel->r_offset + 8);
rel[1].r_info = ELFNN_R_INFO (ELFNN_R_SYM (rel->r_info),
AARCH64_R (TLSLE_ADD_TPREL_LO12_NC));
else
{
/* Tiny GD->IE relaxation:
- adr x0, :tlsgd:var => ldr x0, :gottprel:var
+ adr x0, :tlsgd:var => ldr R0, :gottprel:var
bl __tls_get_addr => mrs x1, tpidr_el0
- nop => add x0, x0, x1
- */
+ nop => add R0, R0, R1
+
+ Where R is x for LP64, and w for Ilp32. */
/* First kill the tls_get_addr reloc on the bl instruction. */
BFD_ASSERT (rel->r_offset + 4 == rel[1].r_offset);
rel[1].r_info = ELFNN_R_INFO (STN_UNDEF, R_AARCH64_NONE);
- bfd_putl32 (0x58000000, contents + rel->r_offset);
+ bfd_putl32 (ldr_R0, contents + rel->r_offset);
bfd_putl32 (0xd53bd041, contents + rel->r_offset + 4);
- bfd_putl32 (0x8b000020, contents + rel->r_offset + 8);
+ bfd_putl32 (add_R0_R0_R1, contents + rel->r_offset + 8);
return bfd_reloc_continue;
}
AARCH64_R (TLSLE_MOVW_TPREL_G0_NC));
rel[2].r_offset = rel->r_offset + 8;
- bfd_putl32 (0xd2c00000, contents + rel->r_offset + 0);
- bfd_putl32 (0xf2a00000, contents + rel->r_offset + 4);
- bfd_putl32 (0xf2800000, contents + rel->r_offset + 8);
+ bfd_putl32 (movz_hw_R0, contents + rel->r_offset + 0);
+ bfd_putl32 (ldr_hw_R0, contents + rel->r_offset + 4);
+ bfd_putl32 (movk_R0, contents + rel->r_offset + 8);
bfd_putl32 (0xd53bd041, contents + rel->r_offset + 12);
- bfd_putl32 (0x8b000020, contents + rel->r_offset + 16);
+ bfd_putl32 (add_R0_R0_R1, contents + rel->r_offset + 16);
}
else
{
*/
rel[2].r_info = ELFNN_R_INFO (STN_UNDEF, R_AARCH64_NONE);
bfd_putl32 (0xd2a80000, contents + rel->r_offset + 0);
- bfd_putl32 (0x58000000, contents + rel->r_offset + 8);
+ bfd_putl32 (ldr_R0, contents + rel->r_offset + 8);
bfd_putl32 (0xd53bd041, contents + rel->r_offset + 12);
- bfd_putl32 (0x8b000020, contents + rel->r_offset + 16);
+ bfd_putl32 (add_R0_R0_R1, contents + rel->r_offset + 16);
}
return bfd_reloc_continue;
{
/* GD->LE relaxation:
ldr xd, [x0, #:tlsdesc_lo12:var] => movk x0, :tprel_g0_nc:var
- */
- bfd_putl32 (0xf2800000, contents + rel->r_offset);
+
+ Where R is x for lp64 mode, and w for ILP32 mode. */
+ bfd_putl32 (movk_R0, contents + rel->r_offset);
return bfd_reloc_continue;
}
else
{
/* GD->IE relaxation:
- ldr xd, [x0, #:tlsdesc_lo12:var] => ldr x0, [x0, #:gottprel_lo12:var]
- */
+ ldr xd, [x0, #:tlsdesc_lo12:var] => ldr R0, [x0, #:gottprel_lo12:var]
+
+ Where R is x for lp64 mode, and w for ILP32 mode. */
insn = bfd_getl32 (contents + rel->r_offset);
- insn &= 0xffffffe0;
- bfd_putl32 (insn, contents + rel->r_offset);
+ bfd_putl32 (ldr_R0_mask (insn), contents + rel->r_offset);
return bfd_reloc_continue;
}
if (is_local)
{
/* GD->LE relaxation
- add x0, #:tlsgd_lo12:var => movk x0, :tprel_g0_nc:var
+ add x0, #:tlsgd_lo12:var => movk R0, :tprel_g0_nc:var
bl __tls_get_addr => mrs x1, tpidr_el0
- nop => add x0, x1, x0
- */
+ nop => add R0, R1, R0
+
+ Where R is x for lp64 mode, and w for ILP32 mode. */
/* First kill the tls_get_addr reloc on the bl instruction. */
BFD_ASSERT (rel->r_offset + 4 == rel[1].r_offset);
rel[1].r_info = ELFNN_R_INFO (STN_UNDEF, R_AARCH64_NONE);
- bfd_putl32 (0xf2800000, contents + rel->r_offset);
+ bfd_putl32 (movk_R0, contents + rel->r_offset);
bfd_putl32 (0xd53bd041, contents + rel->r_offset + 4);
- bfd_putl32 (0x8b000020, contents + rel->r_offset + 8);
+ bfd_putl32 (add_R0_R0_R1, contents + rel->r_offset + 8);
return bfd_reloc_continue;
}
else
/* We choose to fixup the BL and NOP instructions using the
offset from the second relocation to allow flexibility in
scheduling instructions between the ADD and BL. */
-#if ARCH_SIZE == 32
- bfd_putl32 (0xb9400000, contents + rel->r_offset);
- bfd_putl32 (0x0b000020, contents + rel[1].r_offset + 4);
-#else
- bfd_putl32 (0xf9400000, contents + rel->r_offset);
- bfd_putl32 (0x8b000020, contents + rel[1].r_offset + 4);
-#endif
+ bfd_putl32 (ldr_R0_x0, contents + rel->r_offset);
bfd_putl32 (0xd53bd041, contents + rel[1].r_offset);
+ bfd_putl32 (add_R0_R0_R1, contents + rel[1].r_offset + 4);
return bfd_reloc_continue;
}
if (is_local)
{
/* GD->LE relaxation:
- ldr xd, [gp, xn] => movk x0, #:tprel_g0_nc:var
- */
- bfd_putl32 (0xf2800000, contents + rel->r_offset);
+ ldr xd, [gp, xn] => movk R0, #:tprel_g0_nc:var
+
+ Where R is x for lp64 mode, and w for ILP32 mode. */
+ bfd_putl32 (movk_R0, contents + rel->r_offset);
return bfd_reloc_continue;
}
else
{
/* GD->IE relaxation:
- ldr xd, [gp, xn] => ldr x0, [gp, xn]
- */
+ ldr xd, [gp, xn] => ldr R0, [gp, xn]
+
+ Where R is x for lp64 mode, and w for ILP32 mode. */
insn = bfd_getl32 (contents + rel->r_offset);
- insn &= 0xffffffe0;
- bfd_putl32 (insn, contents + rel->r_offset);
+ bfd_putl32 (ldr_R0_mask (insn), contents + rel->r_offset);
return bfd_reloc_ok;
}
case BFD_RELOC_AARCH64_TLSDESC_OFF_G0_NC:
/* GD->LE relaxation:
- movk xd, #:tlsdesc_off_g0_nc:var => movk x0, #:tprel_g1_nc:var, lsl #16
+ movk xd, #:tlsdesc_off_g0_nc:var => movk R0, #:tprel_g1_nc:var, lsl #16
GD->IE relaxation:
- movk xd, #:tlsdesc_off_g0_nc:var => movk xd, #:gottprel_g0_nc:var
- */
+ movk xd, #:tlsdesc_off_g0_nc:var => movk Rd, #:gottprel_g0_nc:var
+
+ Where R is x for lp64 mode, and w for ILP32 mode. */
if (is_local)
- bfd_putl32 (0xf2a00000, contents + rel->r_offset);
+ bfd_putl32 (ldr_hw_R0, contents + rel->r_offset);
return bfd_reloc_continue;
case BFD_RELOC_AARCH64_TLSDESC_OFF_G1:
if (is_local)
{
/* GD->LE relaxation:
- movz xd, #:tlsdesc_off_g1:var => movz x0, #:tprel_g2:var, lsl #32
- */
- bfd_putl32 (0xd2c00000, contents + rel->r_offset);
+ movz xd, #:tlsdesc_off_g1:var => movz R0, #:tprel_g2:var, lsl #32
+
+ Where R is x for lp64 mode, and w for ILP32 mode. */
+ bfd_putl32 (movz_hw_R0, contents + rel->r_offset);
return bfd_reloc_continue;
}
else
{
/* GD->IE relaxation:
- movz xd, #:tlsdesc_off_g1:var => movz xd, #:gottprel_g1:var, lsl #16
- */
+ movz xd, #:tlsdesc_off_g1:var => movz Rd, #:gottprel_g1:var, lsl #16
+
+ Where R is x for lp64 mode, and w for ILP32 mode. */
insn = bfd_getl32 (contents + rel->r_offset);
- bfd_putl32 (0xd2a00000 | (insn & 0x1f), contents + rel->r_offset);
+ bfd_putl32 (movz_R0 | (insn & 0x1f), contents + rel->r_offset);
return bfd_reloc_continue;
}
case BFD_RELOC_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21:
/* IE->LE relaxation:
- adrp xd, :gottprel:var => movz xd, :tprel_g1:var
- */
+ adrp xd, :gottprel:var => movz Rd, :tprel_g1:var
+
+ Where R is x for lp64 mode, and w for ILP32 mode. */
if (is_local)
{
insn = bfd_getl32 (contents + rel->r_offset);
- bfd_putl32 (0xd2a00000 | (insn & 0x1f), contents + rel->r_offset);
+ bfd_putl32 (movz_R0 | (insn & 0x1f), contents + rel->r_offset);
}
return bfd_reloc_continue;
case BFD_RELOC_AARCH64_TLSIE_LDNN_GOTTPREL_LO12_NC:
/* IE->LE relaxation:
- ldr xd, [xm, #:gottprel_lo12:var] => movk xd, :tprel_g0_nc:var
- */
+ ldr xd, [xm, #:gottprel_lo12:var] => movk Rd, :tprel_g0_nc:var
+
+ Where R is x for lp64 mode, and w for ILP32 mode. */
if (is_local)
{
insn = bfd_getl32 (contents + rel->r_offset);
- bfd_putl32 (0xf2800000 | (insn & 0x1f), contents + rel->r_offset);
+ bfd_putl32 (movk_R0 | (insn & 0x1f), contents + rel->r_offset);
}
return bfd_reloc_continue;
/* No need of CALL26 relocation for tls_get_addr. */
rel[1].r_info = ELFNN_R_INFO (STN_UNDEF, R_AARCH64_NONE);
bfd_putl32 (0xd53bd040, contents + rel->r_offset + 0);
-#if ARCH_SIZE == 64
- bfd_putl32 (0x91004000, contents + rel->r_offset + 4);
-#else
- bfd_putl32 (0x11002000, contents + rel->r_offset + 4);
-#endif
+ bfd_putl32 (add_R0_R0 | (TCB_SIZE << 10),
+ contents + rel->r_offset + 4);
return bfd_reloc_ok;
}
return bfd_reloc_continue;
BFD_ASSERT (ELFNN_R_TYPE (rel[1].r_info) == AARCH64_R (CALL26));
/* No need of CALL26 relocation for tls_get_addr. */
rel[1].r_info = ELFNN_R_INFO (STN_UNDEF, R_AARCH64_NONE);
-#if ARCH_SIZE == 64
- bfd_putl32 (0x91004000, contents + rel->r_offset + 0);
-#else
- bfd_putl32 (0x11002000, contents + rel->r_offset + 0);
-#endif
+ bfd_putl32 (add_R0_R0 | (TCB_SIZE << 10),
+ contents + rel->r_offset + 0);
bfd_putl32 (INSN_NOP, contents + rel->r_offset + 4);
return bfd_reloc_ok;
}
struct elf_link_hash_entry *h)
{
struct elf_aarch64_link_hash_table *htab;
- asection *s;
+ asection *s, *srel;
/* If this is a function, put it in the procedure linkage table. We
will fill in the contents of the procedure linkage table later,
/* We must generate a R_AARCH64_COPY reloc to tell the dynamic linker
to copy the initial value out of the dynamic object and into the
runtime process image. */
+ if ((h->root.u.def.section->flags & SEC_READONLY) != 0)
+ {
+ s = htab->root.sdynrelro;
+ srel = htab->root.sreldynrelro;
+ }
+ else
+ {
+ s = htab->root.sdynbss;
+ srel = htab->root.srelbss;
+ }
if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
{
- htab->root.srelbss->size += RELOC_SIZE (htab);
+ srel->size += RELOC_SIZE (htab);
h->needs_copy = 1;
}
- s = htab->root.sdynbss;
-
return _bfd_elf_adjust_dynamic_copy (info, h, s);
}
break;
}
- /* It is referenced by a non-shared object. */
+ /* It is referenced by a non-shared object. */
h->ref_regular = 1;
h->root.non_ir_ref = 1;
}
because we will also be presented with the concrete instance of
the symbol and elfNN_aarch64_copy_indirect_symbol () will have been
called to copy all relevant data from the generic to the concrete
- symbol instance.
- */
+ symbol instance. */
if (h->root.type == bfd_link_hash_indirect)
return TRUE;
because we will also be presented with the concrete instance of
the symbol and elfNN_aarch64_copy_indirect_symbol () will have been
called to copy all relevant data from the generic to the concrete
- symbol instance.
- */
+ symbol instance. */
if (h->root.type == bfd_link_hash_indirect)
return TRUE;
/* This is the most important function of all . Innocuosly named
though ! */
+
static bfd_boolean
elfNN_aarch64_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
struct bfd_link_info *info)
|| s == htab->root.sgotplt
|| s == htab->root.iplt
|| s == htab->root.igotplt
- || s == htab->root.sdynbss)
+ || s == htab->root.sdynbss
+ || s == htab->root.sdynrelro)
{
/* Strip this section if we don't need it; see the
comment below. */
adjust_dynamic_symbol is called, and it is that
function which decides whether anything needs to go
into these sections. */
-
s->flags |= SEC_EXCLUDE;
continue;
}
/* Finish up dynamic symbol handling. We set the contents of various
dynamic sections here. */
+
static bfd_boolean
elfNN_aarch64_finish_dynamic_symbol (bfd *output_bfd,
struct bfd_link_info *info,
if (h->needs_copy)
{
Elf_Internal_Rela rela;
+ asection *s;
bfd_byte *loc;
/* This symbol needs a copy reloc. Set it up. */
-
if (h->dynindx == -1
|| (h->root.type != bfd_link_hash_defined
&& h->root.type != bfd_link_hash_defweak)
+ h->root.u.def.section->output_offset);
rela.r_info = ELFNN_R_INFO (h->dynindx, AARCH64_R (COPY));
rela.r_addend = 0;
- loc = htab->root.srelbss->contents;
- loc += htab->root.srelbss->reloc_count++ * RELOC_SIZE (htab);
+ if ((h->root.u.def.section->flags & SEC_READONLY) != 0)
+ s = htab->root.sreldynrelro;
+ else
+ s = htab->root.srelbss;
+ loc = s->contents + s->reloc_count++ * RELOC_SIZE (htab);
bfd_elfNN_swap_reloca_out (output_bfd, &rela, loc);
}
// GOTPLT entry for this.
br x17
PLT0 will be slightly different in ELF32 due to different got entry
- size.
- */
+ size. */
bfd_vma plt_got_2nd_ent; /* Address of GOT[2]. */
bfd_vma plt_base;
#define elf_backend_plt_readonly 1
#define elf_backend_want_got_plt 1
#define elf_backend_want_plt_sym 0
+#define elf_backend_want_dynrelro 1
#define elf_backend_may_use_rel_p 0
#define elf_backend_may_use_rela_p 1
#define elf_backend_default_use_rela_p 1
#define elf_backend_got_header_size (GOT_ENTRY_SIZE * 3)
#define elf_backend_default_execstack 0
#define elf_backend_extern_protected_data 1
+#define elf_backend_hash_symbol elf_aarch64_hash_symbol
#undef elf_backend_obj_attrs_section
#define elf_backend_obj_attrs_section ".ARM.attributes"
projects / deliverable / binutils-gdb.git / blobdiff