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* elf64-alpha.c (elf64_alpha_relax_with_lituse): Relax jsr to

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undefweak to use zero register.  Call elf64_alpha_relax_got_load
        if not all uses removed.
        (elf64_alpha_relax_got_load): Relax undefweak to lda zero.
        (elf64_alpha_relax_section): Handle undefweak symbols.
        (elf64_alpha_calc_dynrel_sizes): Don't add relocs for undefweak.
        (elf64_alpha_size_rela_got_1): Likewise.
        (elf64_alpha_relocate_section): Likewise.
This commit is contained in:
Richard Henderson 2005-05-22 22:13:21 +00:00
parent 487c435301
commit d6ad34f6c2
2 changed files with 95 additions and 37 deletions
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11
bfd/ChangeLog
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@ -1,3 +1,14 @@
2005-05-22 Richard Henderson <rth@redhat.com>
* elf64-alpha.c (elf64_alpha_relax_with_lituse): Relax jsr to
undefweak to use zero register. Call elf64_alpha_relax_got_load
if not all uses removed.
(elf64_alpha_relax_got_load): Relax undefweak to lda zero.
(elf64_alpha_relax_section): Handle undefweak symbols.
(elf64_alpha_calc_dynrel_sizes): Don't add relocs for undefweak.
(elf64_alpha_size_rela_got_1): Likewise.
(elf64_alpha_relocate_section): Likewise.
2005-05-22 Richard Henderson <rth@redhat.com>
* elf64-alpha.c (elf64_alpha_relax_section): Only operate

121
bfd/elf64-alpha.c
View File

@ -1300,9 +1300,7 @@ elf64_alpha_relax_with_lituse (info, symval, irel)
/* Extract the displacement from the instruction, sign-extending
it if necessary, then test whether it is within 16 or 32 bits
displacement from GP. */
insn_disp = insn & 0x0000ffff;
if (insn_disp & 0x8000)
insn_disp |= ~0xffff; /* Negative: sign-extend. */
insn_disp = ((insn & 0xffff) ^ 0x8000) - 0x8000;
xdisp = disp + insn_disp;
fits16 = (xdisp >= - (bfd_signed_vma) 0x8000 && xdisp < 0x8000);
@ -1371,6 +1369,19 @@ elf64_alpha_relax_with_lituse (info, symval, irel)
bfd_vma optdest, org;
bfd_signed_vma odisp;
/* For undefined weak symbols, we're mostly interested in getting
rid of the got entry whenever possible, so optimize this to a
use of the zero register. */
if (info->h && info->h->root.root.type == bfd_link_hash_undefweak)
{
insn |= 31 << 16;
bfd_put_32 (info->abfd, (bfd_vma) insn,
info->contents + urel->r_offset);
info->changed_contents = TRUE;
break;
}
/* If not zero, place to jump without needing pv. */
optdest = elf64_alpha_relax_opt_call (info, symval);
org = (info->sec->output_section->vma
@ -1474,9 +1485,11 @@ elf64_alpha_relax_with_lituse (info, symval, irel)
info->contents + irel->r_offset);
info->changed_contents = TRUE;
}
}
return TRUE;
return TRUE;
}
else
return elf64_alpha_relax_got_load (info, symval, irel, R_ALPHA_LITERAL);
}
static bfd_vma
@ -1583,7 +1596,25 @@ elf64_alpha_relax_got_load (info, symval, irel, r_type)
return TRUE;
if (r_type == R_ALPHA_LITERAL)
disp = symval - info->gp;
{
/* Look for nice constant addresses. This includes the not-uncommon
special case of 0 for undefweak symbols. */
if ((info->h && info->h->root.root.type == bfd_link_hash_undefweak)
|| (!info->link_info->shared
&& (symval >= (bfd_vma)-0x8000 || symval < 0x8000)))
{
disp = 0;
insn = (OP_LDA << 26) | (insn & (31 << 21)) | (31 << 16);
insn |= (symval & 0xffff);
r_type = R_ALPHA_NONE;
}
else
{
disp = symval - info->gp;
insn = (OP_LDA << 26) | (insn & 0x03ff0000);
r_type = R_ALPHA_GPREL16;
}
}
else
{
bfd_vma dtp_base, tp_base;
@ -1592,17 +1623,26 @@ elf64_alpha_relax_got_load (info, symval, irel, r_type)
dtp_base = alpha_get_dtprel_base (info->link_info);
tp_base = alpha_get_tprel_base (info->link_info);
disp = symval - (r_type == R_ALPHA_GOTDTPREL ? dtp_base : tp_base);
insn = (OP_LDA << 26) | (insn & (31 << 21)) | (31 << 16);
switch (r_type)
{
case R_ALPHA_GOTDTPREL:
r_type = R_ALPHA_DTPREL16;
break;
case R_ALPHA_GOTTPREL:
r_type = R_ALPHA_TPREL16;
break;
default:
BFD_ASSERT (0);
return FALSE;
}
}
if (disp < -0x8000 || disp >= 0x8000)
return TRUE;
/* Exchange LDQ for LDA. In the case of the TLS relocs, we're loading
a constant, so force the base register to be $31. */
if (r_type == R_ALPHA_LITERAL)
insn = (OP_LDA << 26) | (insn & 0x03ff0000);
else
insn = (OP_LDA << 26) | (insn & (31 << 21)) | (31 << 16);
bfd_put_32 (info->abfd, (bfd_vma) insn, info->contents + irel->r_offset);
info->changed_contents = TRUE;
@ -1617,22 +1657,6 @@ elf64_alpha_relax_got_load (info, symval, irel, r_type)
}
/* Smash the existing GOT relocation for its 16-bit immediate pair. */
switch (r_type)
{
case R_ALPHA_LITERAL:
r_type = R_ALPHA_GPREL16;
break;
case R_ALPHA_GOTDTPREL:
r_type = R_ALPHA_DTPREL16;
break;
case R_ALPHA_GOTTPREL:
r_type = R_ALPHA_TPREL16;
break;
default:
BFD_ASSERT (0);
return FALSE;
}
irel->r_info = ELF64_R_INFO (ELF64_R_SYM (irel->r_info), r_type);
info->changed_relocs = TRUE;
@ -2103,13 +2127,17 @@ elf64_alpha_relax_section (abfd, sec, link_info, again)
h = (struct alpha_elf_link_hash_entry *)h->root.root.u.i.link;
/* If the symbol is undefined, we can't do anything with it. */
if (h->root.root.type == bfd_link_hash_undefweak
|| h->root.root.type == bfd_link_hash_undefined)
if (h->root.root.type == bfd_link_hash_undefined)
continue;
/* If the symbol isn't defined in the current module, again
we can't do anything. */
if (!h->root.def_regular)
/* If the symbol isn't defined in the current module,
again we can't do anything. */
if (h->root.root.type == bfd_link_hash_undefweak)
{
info.tsec = bfd_abs_section_ptr;
symval = 0;
}
else if (!h->root.def_regular)
{
/* Except for TLSGD relocs, which can sometimes be
relaxed to GOTTPREL relocs. */
@ -3860,9 +3888,14 @@ elf64_alpha_calc_dynrel_sizes (h, info)
/* If the symbol is dynamic, we'll need all the relocations in their
natural form. If this is a shared object, and it has been forced
local, we'll need the same number of RELATIVE relocations. */
dynamic = alpha_elf_dynamic_symbol_p (&h->root, info);
/* If the symbol is a hidden undefined weak, then we never have any
relocations. Avoid the loop which may want to add RELATIVE relocs
based on info->shared. */
if (h->root.root.type == bfd_link_hash_undefweak && !dynamic)
return TRUE;
for (relent = h->reloc_entries; relent; relent = relent->next)
{
entries = alpha_dynamic_entries_for_reloc (relent->rtype, dynamic,
@ -3950,9 +3983,14 @@ elf64_alpha_size_rela_got_1 (h, info)
/* If the symbol is dynamic, we'll need all the relocations in their
natural form. If this is a shared object, and it has been forced
local, we'll need the same number of RELATIVE relocations. */
dynamic = alpha_elf_dynamic_symbol_p (&h->root, info);
/* If the symbol is a hidden undefined weak, then we never have any
relocations. Avoid the loop which may want to add RELATIVE relocs
based on info->shared. */
if (h->root.root.type == bfd_link_hash_undefweak && !dynamic)
return TRUE;
entries = 0;
for (gotent = h->got_entries; gotent ; gotent = gotent->next)
if (gotent->use_count > 0)
@ -4445,7 +4483,7 @@ elf64_alpha_relocate_section (output_bfd, info, input_bfd, input_section,
/* If the symbol has been forced local, output a
RELATIVE reloc, otherwise it will be handled in
finish_dynamic_symbol. */
if (info->shared && !dynamic_symbol_p)
if (info->shared && !dynamic_symbol_p && !undef_weak_ref)
elf64_alpha_emit_dynrel (output_bfd, info, sgot, srelgot,
gotent->got_offset, 0,
R_ALPHA_RELATIVE, value);
@ -4617,7 +4655,8 @@ elf64_alpha_relocate_section (output_bfd, info, input_bfd, input_section,
}
else if (info->shared
&& r_symndx != 0
&& (input_section->flags & SEC_ALLOC))
&& (input_section->flags & SEC_ALLOC)
&& !undef_weak_ref)
{
if (r_type == R_ALPHA_REFLONG)
{
@ -4650,6 +4689,14 @@ elf64_alpha_relocate_section (output_bfd, info, input_bfd, input_section,
input_bfd, h->root.root.root.string);
ret_val = FALSE;
}
else if ((info->shared || info->pie) && undef_weak_ref)
{
(*_bfd_error_handler)
(_("%B: pc-relative relocation against undefined weak symbol %s"),
input_bfd, h->root.root.root.string);
ret_val = FALSE;
}
/* ??? .eh_frame references to discarded sections will be smashed
to relocations against SHN_UNDEF. The .eh_frame format allows