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Rearrange ppc_size_one_stub and correct _notoc stub examples

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This patch rearranges ppc_size_one_stub to make it a little easier to
compare against ppc_build_one_stub, and makes a few other random
changes that might help for future maintenance.  There should be no
functional changes here.

The patch also fixes code examples in comments.  A couple of "ori"
instructions lacked the source register operand, and "@high" is the
correct reloc modifier to use in a sequence building a 64-bit value.
(@hi reports overflow of a 32-bit signed value.)

	* elf64-ppc.c: Correct _notoc stub comments.
	(ppc_build_one_stub): Simplify output of branch for notoc
	long branch stub.  Don't include label offset of 8 bytes in
	"off" calculation for notoc plt stub.  Don't emit insns to get pc.
	(build_offset): Emit insns to get pc here instead.
	(size_offset): Add 4 extra insns.
	(plt_stub_size): Adjust for "off" and size_offset changes.
	(ppc_size_one_stub): Rearrange code into a switch, duplicating
	some to better match ppc_build_one_stub.
This commit is contained in:
Alan Modra 2018-08-29 14:11:25 +09:30
parent 4bb3c591b2
commit f891966ff6
2 changed files with 288 additions and 232 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
bfd/ChangeLog
View File

@ -1,3 +1,15 @@
2018-08-31 Alan Modra <amodra@gmail.com>
* elf64-ppc.c: Correct _notoc stub comments.
(ppc_build_one_stub): Simplify output of branch for notoc
long branch stub. Don't include label offset of 8 bytes in
"off" calculation for notoc plt stub. Don't emit insns to get pc.
(build_offset): Emit insns to get pc here instead.
(size_offset): Add 4 extra insns.
(plt_stub_size): Adjust for "off" and size_offset changes.
(ppc_size_one_stub): Rearrange code into a switch, duplicating
some to better match ppc_build_one_stub.
2018-08-29 Chenghua Xu <paul.hua.gm@gmail.com>
* archures.c (bfd_architecture): New machine

508
bfd/elf64-ppc.c
View File

@ -2634,9 +2634,9 @@ must_be_dyn_reloc (struct bfd_link_info *info,
. mflr %r11
. mtlr %r12
. lis %r12,xxx-1b@highest
. ori %r12,xxx-1b@higher
. ori %r12,%r12,xxx-1b@higher
. sldi %r12,%r12,32
. oris %r12,%r12,xxx-1b@hi
. oris %r12,%r12,xxx-1b@high
. ori %r12,%r12,xxx-1b@l
. add %r12,%r11,%r12
. mtctr %r12
@ -2649,9 +2649,9 @@ must_be_dyn_reloc (struct bfd_link_info *info,
. mflr %r11
. mtlr %r12
. lis %r12,xxx-1b@highest
. ori %r12,xxx-1b@higher
. ori %r12,%r12,xxx-1b@higher
. sldi %r12,%r12,32
. oris %r12,%r12,xxx-1b@hi
. oris %r12,%r12,xxx-1b@high
. ori %r12,%r12,xxx-1b@l
. ldx %r12,%r11,%r12
. mtctr %r12
@ -9478,18 +9478,30 @@ ppc_type_of_stub (asection *input_sec,
return ppc_stub_none;
}
/* Builds a 64-bit offset in r12 then adds it to r11 (LOAD false) or
loads r12 from r11+r12 (LOAD true).
/* Gets the address of a label (1:) in r11 and builds an offset in r12,
then adds it to r11 (LOAD false) or loads r12 from r11+r12 (LOAD true).
. mflr %r12
. bcl 20,31,1f
.1: mflr %r11
. mtlr %r12
. lis %r12,xxx-1b@highest
. ori %r12,xxx-1b@higher
. ori %r12,%r12,xxx-1b@higher
. sldi %r12,%r12,32
. oris %r12,%r12,xxx-1b@hi
. oris %r12,%r12,xxx-1b@high
. ori %r12,%r12,xxx-1b@l
. add %r12,%r11,%r12 */
. add/ldx %r12,%r11,%r12 */
static bfd_byte *
build_offset (bfd *abfd, bfd_byte *p, bfd_vma off, bfd_boolean load)
{
bfd_put_32 (abfd, MFLR_R12, p);
p += 4;
bfd_put_32 (abfd, BCL_20_31, p);
p += 4;
bfd_put_32 (abfd, MFLR_R11, p);
p += 4;
bfd_put_32 (abfd, MTLR_R12, p);
p += 4;
if (off + 0x8000 < 0x10000)
{
if (load)
@ -9575,7 +9587,7 @@ size_offset (bfd_vma off)
size += 4;
size += 4;
}
return size;
return size + 16;
}
/* Emit .eh_frame opcode to advance pc by DELTA. */
@ -9655,7 +9667,7 @@ plt_stub_size (struct ppc_link_hash_table *htab,
if (stub_entry->stub_type >= ppc_stub_plt_call_notoc)
{
size = 24 + size_offset (off);
size = 8 + size_offset (off - 8);
if (stub_entry->stub_type > ppc_stub_plt_call_notoc)
size += 4;
return size;
@ -10325,7 +10337,7 @@ ppc_build_one_stub (struct bfd_hash_entry *gen_entry, void *in_arg)
case ppc_stub_plt_call_notoc:
case ppc_stub_plt_call_both:
p = loc;
off = (8 + stub_entry->stub_offset
off = (stub_entry->stub_offset
+ stub_entry->group->stub_sec->output_offset
+ stub_entry->group->stub_sec->output_section->vma);
if (stub_entry->stub_type == ppc_stub_long_branch_both
@ -10359,27 +10371,24 @@ ppc_build_one_stub (struct bfd_hash_entry *gen_entry, void *in_arg)
+ stub_entry->target_section->output_offset
+ stub_entry->target_section->output_section->vma);
off = targ - off;
bfd_put_32 (htab->params->stub_bfd, MFLR_R12, p);
p += 4;
bfd_put_32 (htab->params->stub_bfd, BCL_20_31, p);
p += 4;
bfd_put_32 (htab->params->stub_bfd, MFLR_R11, p);
p += 4;
bfd_put_32 (htab->params->stub_bfd, MTLR_R12, p);
p += 4;
/* The notoc stubs calculate their target (either a PLT entry or
the global entry point of a function) relative to the PC
returned by the "bcl" two instructions past the start of the
sequence emitted by build_offset. The offset is therefore 8
less than calculated from the start of the sequence. */
off -= 8;
p = build_offset (htab->params->stub_bfd, p, off,
stub_entry->stub_type >= ppc_stub_plt_call_notoc);
if (stub_entry->stub_type == ppc_stub_long_branch_notoc)
if (stub_entry->stub_type <= ppc_stub_long_branch_both)
{
off += 8;
bfd_vma from;
from = (stub_entry->stub_offset
+ stub_entry->group->stub_sec->output_offset
+ stub_entry->group->stub_sec->output_section->vma
+ (p - loc));
bfd_put_32 (htab->params->stub_bfd,
B_DOT | ((off - (p - loc)) & 0x3fffffc), p);
}
else if (stub_entry->stub_type == ppc_stub_long_branch_both)
{
off += 12;
bfd_put_32 (htab->params->stub_bfd,
B_DOT | ((off - (p - loc)) & 0x3fffffc), p);
B_DOT | ((targ - from) & 0x3fffffc), p);
}
else
{
@ -10557,8 +10566,9 @@ ppc_size_one_stub (struct bfd_hash_entry *gen_entry, void *in_arg)
struct ppc_stub_hash_entry *stub_entry;
struct bfd_link_info *info;
struct ppc_link_hash_table *htab;
bfd_vma targ, off;
int size;
asection *plt;
bfd_vma targ, off, r2off;
unsigned int size, extra, lr_used, delta;
/* Massage our args to the form they really have. */
stub_entry = (struct ppc_stub_hash_entry *) gen_entry;
@ -10583,122 +10593,26 @@ ppc_size_one_stub (struct bfd_hash_entry *gen_entry, void *in_arg)
return TRUE;
}
if (stub_entry->stub_type >= ppc_stub_plt_call
&& stub_entry->stub_type <= ppc_stub_plt_call_both)
switch (stub_entry->stub_type)
{
asection *plt;
targ = stub_entry->plt_ent->plt.offset & ~(bfd_vma) 1;
if (targ >= (bfd_vma) -2)
abort ();
plt = htab->elf.splt;
if (!htab->elf.dynamic_sections_created
|| stub_entry->h == NULL
|| stub_entry->h->elf.dynindx == -1)
{
if (stub_entry->symtype == STT_GNU_IFUNC)
plt = htab->elf.iplt;
else
plt = htab->pltlocal;
}
targ += plt->output_offset + plt->output_section->vma;
if (stub_entry->stub_type >= ppc_stub_plt_call_notoc)
{
off = (8 + stub_entry->stub_offset
+ stub_entry->group->stub_sec->output_offset
+ stub_entry->group->stub_sec->output_section->vma);
if (stub_entry->stub_type > ppc_stub_plt_call_notoc)
off += 4;
}
else
off = (elf_gp (info->output_bfd)
+ htab->sec_info[stub_entry->group->link_sec->id].toc_off);
if (htab->params->plt_stub_align != 0)
{
unsigned pad = plt_stub_pad (htab, stub_entry, targ - off);
stub_entry->group->stub_sec->size += pad;
stub_entry->stub_offset = stub_entry->group->stub_sec->size;
if (stub_entry->stub_type >= ppc_stub_plt_call_notoc)
off += pad;
}
off = targ - off;
size = plt_stub_size (htab, stub_entry, off);
if (stub_entry->stub_type >= ppc_stub_plt_call_notoc)
{
/* After the bcl, lr has been modified so we need to emit
.eh_frame info saying the return address is in r12. */
unsigned int lr_used = stub_entry->stub_offset + 8;
unsigned int delta;
if (stub_entry->stub_type > ppc_stub_plt_call_notoc)
lr_used += 4;
/* The eh_frame info will consist of a DW_CFA_advance_loc or
variant, DW_CFA_register, 65, 12, DW_CFA_advance_loc+2,
DW_CFA_restore_extended 65. */
delta = lr_used - stub_entry->group->lr_restore;
stub_entry->group->eh_size += eh_advance_size (delta) + 6;
stub_entry->group->lr_restore = lr_used + 8;
}
else
{
if (stub_entry->h != NULL
&& (stub_entry->h == htab->tls_get_addr_fd
|| stub_entry->h == htab->tls_get_addr)
&& htab->params->tls_get_addr_opt
&& stub_entry->stub_type == ppc_stub_plt_call_r2save)
{
/* After the bctrl, lr has been modified so we need to
emit .eh_frame info saying the return address is
on the stack. In fact we put the EH info specifying
that the return address is on the stack *at* the
call rather than after it, because the EH info for a
call needs to be specified by that point.
See libgcc/unwind-dw2.c execute_cfa_program. */
unsigned int lr_used = stub_entry->stub_offset + size - 20;
unsigned int delta;
/* The eh_frame info will consist of a DW_CFA_advance_loc
or variant, DW_CFA_offset_externed_sf, 65, -stackoff,
DW_CFA_advance_loc+4, DW_CFA_restore_extended, 65. */
delta = lr_used - stub_entry->group->lr_restore;
stub_entry->group->eh_size += eh_advance_size (delta) + 6;
stub_entry->group->lr_restore = size - 4;
}
if (info->emitrelocations)
{
stub_entry->group->stub_sec->reloc_count
+= ((PPC_HA (off) != 0)
+ (htab->opd_abi
? 2 + (htab->params->plt_static_chain
&& PPC_HA (off + 16) == PPC_HA (off))
: 1));
stub_entry->group->stub_sec->flags |= SEC_RELOC;
}
}
}
else
{
/* ppc_stub_long_branch or ppc_stub_plt_branch, or their r2off
variants. */
bfd_vma r2off = 0;
bfd_vma local_off = 0;
case ppc_stub_plt_branch:
case ppc_stub_plt_branch_r2off:
/* Reset the stub type from the plt branch variant in case we now
can reach with a shorter stub. */
stub_entry->stub_type += ppc_stub_long_branch - ppc_stub_plt_branch;
/* Fall through. */
case ppc_stub_long_branch:
case ppc_stub_long_branch_r2off:
targ = (stub_entry->target_value
+ stub_entry->target_section->output_offset
+ stub_entry->target_section->output_section->vma);
targ += PPC64_LOCAL_ENTRY_OFFSET (stub_entry->other);
off = (stub_entry->stub_offset
+ stub_entry->group->stub_sec->output_offset
+ stub_entry->group->stub_sec->output_section->vma);
/* Reset the stub type from the plt variant in case we now
can reach with a shorter stub. */
if (stub_entry->stub_type >= ppc_stub_plt_branch)
stub_entry->stub_type += ppc_stub_long_branch - ppc_stub_plt_branch;
size = 4;
r2off = 0;
if (stub_entry->stub_type == ppc_stub_long_branch_r2off)
{
r2off = get_r2off (info, stub_entry);
@ -10714,116 +10628,246 @@ ppc_size_one_stub (struct bfd_hash_entry *gen_entry, void *in_arg)
size += 4;
off += size - 4;
}
else if (stub_entry->stub_type >= ppc_stub_long_branch_notoc)
{
size = 20 + size_offset (targ - (off + 8));
if (stub_entry->stub_type > ppc_stub_long_branch_notoc)
size += 4;
off += size - 4;
}
off = targ - off;
if (stub_entry->stub_type >= ppc_stub_long_branch_notoc)
/* If the branch offset is too big, use a ppc_stub_plt_branch.
Do the same for -R objects without function descriptors. */
if ((stub_entry->stub_type == ppc_stub_long_branch_r2off
&& r2off == 0
&& htab->sec_info[stub_entry->target_section->id].toc_off == 0)
|| off + (1 << 25) >= (bfd_vma) (1 << 26))
{
/* After the bcl, lr has been modified so we need to emit
.eh_frame info saying the return address is in r12. */
unsigned int lr_used = stub_entry->stub_offset + 8;
unsigned int delta;
if (stub_entry->stub_type > ppc_stub_long_branch_notoc)
lr_used += 4;
/* The eh_frame info will consist of a DW_CFA_advance_loc or
variant, DW_CFA_register, 65, 12, DW_CFA_advance_loc+2,
DW_CFA_restore_extended 65. */
delta = lr_used - stub_entry->group->lr_restore;
stub_entry->group->eh_size += eh_advance_size (delta) + 6;
stub_entry->group->lr_restore = lr_used + 8;
struct ppc_branch_hash_entry *br_entry;
if (off + (1 << 25) >= (bfd_vma) (1 << 26))
br_entry = ppc_branch_hash_lookup (&htab->branch_hash_table,
stub_entry->root.string + 9,
TRUE, FALSE);
if (br_entry == NULL)
{
stub_entry->stub_type += (ppc_stub_plt_branch_notoc
- ppc_stub_long_branch_notoc);
size += 4;
_bfd_error_handler (_("can't build branch stub `%s'"),
stub_entry->root.string);
htab->stub_error = TRUE;
return FALSE;
}
}
else
{
local_off = PPC64_LOCAL_ENTRY_OFFSET (stub_entry->other);
/* If the branch offset is too big, use a ppc_stub_plt_branch.
Do the same for -R objects without function descriptors. */
if ((stub_entry->stub_type == ppc_stub_long_branch_r2off
&& r2off == 0
&& htab->sec_info[stub_entry->target_section->id].toc_off == 0)
|| off + (1 << 25) >= (bfd_vma) (1 << 26) - local_off)
if (br_entry->iter != htab->stub_iteration)
{
struct ppc_branch_hash_entry *br_entry;
br_entry->iter = htab->stub_iteration;
br_entry->offset = htab->brlt->size;
htab->brlt->size += 8;
br_entry = ppc_branch_hash_lookup (&htab->branch_hash_table,
stub_entry->root.string + 9,
TRUE, FALSE);
if (br_entry == NULL)
if (htab->relbrlt != NULL)
htab->relbrlt->size += sizeof (Elf64_External_Rela);
else if (info->emitrelocations)
{
_bfd_error_handler (_("can't build branch stub `%s'"),
stub_entry->root.string);
htab->stub_error = TRUE;
return FALSE;
}
if (br_entry->iter != htab->stub_iteration)
{
br_entry->iter = htab->stub_iteration;
br_entry->offset = htab->brlt->size;
htab->brlt->size += 8;
if (htab->relbrlt != NULL)
htab->relbrlt->size += sizeof (Elf64_External_Rela);
else if (info->emitrelocations)
{
htab->brlt->reloc_count += 1;
htab->brlt->flags |= SEC_RELOC;
}
}
targ = (br_entry->offset
+ htab->brlt->output_offset
+ htab->brlt->output_section->vma);
off = (elf_gp (info->output_bfd)
+ htab->sec_info[stub_entry->group->link_sec->id].toc_off);
off = targ - off;
if (info->emitrelocations)
{
stub_entry->group->stub_sec->reloc_count
+= 1 + (PPC_HA (off) != 0);
stub_entry->group->stub_sec->flags |= SEC_RELOC;
}
stub_entry->stub_type
+= ppc_stub_plt_branch - ppc_stub_long_branch;
if (stub_entry->stub_type != ppc_stub_plt_branch_r2off)
{
size = 12;
if (PPC_HA (off) != 0)
size = 16;
}
else
{
size = 16;
if (PPC_HA (off) != 0)
size += 4;
if (PPC_HA (r2off) != 0)
size += 4;
if (PPC_LO (r2off) != 0)
size += 4;
htab->brlt->reloc_count += 1;
htab->brlt->flags |= SEC_RELOC;
}
}
else if (info->emitrelocations)
targ = (br_entry->offset
+ htab->brlt->output_offset
+ htab->brlt->output_section->vma);
off = (elf_gp (info->output_bfd)
+ htab->sec_info[stub_entry->group->link_sec->id].toc_off);
off = targ - off;
if (info->emitrelocations)
{
stub_entry->group->stub_sec->reloc_count += 1;
stub_entry->group->stub_sec->reloc_count
+= 1 + (PPC_HA (off) != 0);
stub_entry->group->stub_sec->flags |= SEC_RELOC;
}
stub_entry->stub_type += ppc_stub_plt_branch - ppc_stub_long_branch;
if (stub_entry->stub_type != ppc_stub_plt_branch_r2off)
{
size = 12;
if (PPC_HA (off) != 0)
size = 16;
}
else
{
size = 16;
if (PPC_HA (off) != 0)
size += 4;
if (PPC_HA (r2off) != 0)
size += 4;
if (PPC_LO (r2off) != 0)
size += 4;
}
}
else if (info->emitrelocations)
{
stub_entry->group->stub_sec->reloc_count += 1;
stub_entry->group->stub_sec->flags |= SEC_RELOC;
}
break;
case ppc_stub_plt_branch_notoc:
case ppc_stub_plt_branch_both:
stub_entry->stub_type += ppc_stub_long_branch - ppc_stub_plt_branch;
/* Fall through. */
case ppc_stub_long_branch_notoc:
case ppc_stub_long_branch_both:
off = (stub_entry->stub_offset
+ stub_entry->group->stub_sec->output_offset
+ stub_entry->group->stub_sec->output_section->vma);
size = 0;
if (stub_entry->stub_type == ppc_stub_long_branch_both)
size = 4;
off += size;
targ = (stub_entry->target_value
+ stub_entry->target_section->output_offset
+ stub_entry->target_section->output_section->vma);
off = targ - off;
extra = size_offset (off - 8);
/* Include branch insn plus those in the offset sequence. */
size += 4 + extra;
/* The branch insn is at the end, or "extra" bytes along. So
its offset will be "extra" bytes less that that already
calculated. */
off -= extra;
/* After the bcl, lr has been modified so we need to emit
.eh_frame info saying the return address is in r12. */
lr_used = stub_entry->stub_offset + 8;
if (stub_entry->stub_type == ppc_stub_long_branch_both)
lr_used += 4;
/* The eh_frame info will consist of a DW_CFA_advance_loc or
variant, DW_CFA_register, 65, 12, DW_CFA_advance_loc+2,
DW_CFA_restore_extended 65. */
delta = lr_used - stub_entry->group->lr_restore;
stub_entry->group->eh_size += eh_advance_size (delta) + 6;
stub_entry->group->lr_restore = lr_used + 8;
/* If the branch can't reach, use a plt_branch. */
if (off + (1 << 25) >= (bfd_vma) (1 << 26))
{
stub_entry->stub_type += (ppc_stub_plt_branch_notoc
- ppc_stub_long_branch_notoc);
size += 4;
}
break;
case ppc_stub_plt_call_notoc:
case ppc_stub_plt_call_both:
off = (stub_entry->stub_offset
+ stub_entry->group->stub_sec->output_offset
+ stub_entry->group->stub_sec->output_section->vma);
if (stub_entry->stub_type == ppc_stub_plt_call_both)
off += 4;
targ = stub_entry->plt_ent->plt.offset & ~1;
if (targ >= (bfd_vma) -2)
abort ();
plt = htab->elf.splt;
if (!htab->elf.dynamic_sections_created
|| stub_entry->h == NULL
|| stub_entry->h->elf.dynindx == -1)
{
if (stub_entry->symtype == STT_GNU_IFUNC)
plt = htab->elf.iplt;
else
plt = htab->pltlocal;
}
targ += plt->output_offset + plt->output_section->vma;
off = targ - off;
if (htab->params->plt_stub_align != 0)
{
unsigned pad = plt_stub_pad (htab, stub_entry, off);
stub_entry->group->stub_sec->size += pad;
stub_entry->stub_offset = stub_entry->group->stub_sec->size;
off -= pad;
}
size = plt_stub_size (htab, stub_entry, off);
/* After the bcl, lr has been modified so we need to emit
.eh_frame info saying the return address is in r12. */
lr_used = stub_entry->stub_offset + 8;
if (stub_entry->stub_type == ppc_stub_plt_call_both)
lr_used += 4;
/* The eh_frame info will consist of a DW_CFA_advance_loc or
variant, DW_CFA_register, 65, 12, DW_CFA_advance_loc+2,
DW_CFA_restore_extended 65. */
delta = lr_used - stub_entry->group->lr_restore;
stub_entry->group->eh_size += eh_advance_size (delta) + 6;
stub_entry->group->lr_restore = lr_used + 8;
break;
case ppc_stub_plt_call:
case ppc_stub_plt_call_r2save:
targ = stub_entry->plt_ent->plt.offset & ~(bfd_vma) 1;
if (targ >= (bfd_vma) -2)
abort ();
plt = htab->elf.splt;
if (!htab->elf.dynamic_sections_created
|| stub_entry->h == NULL
|| stub_entry->h->elf.dynindx == -1)
{
if (stub_entry->symtype == STT_GNU_IFUNC)
plt = htab->elf.iplt;
else
plt = htab->pltlocal;
}
targ += plt->output_offset + plt->output_section->vma;
off = (elf_gp (info->output_bfd)
+ htab->sec_info[stub_entry->group->link_sec->id].toc_off);
off = targ - off;
if (htab->params->plt_stub_align != 0)
{
unsigned pad = plt_stub_pad (htab, stub_entry, off);
stub_entry->group->stub_sec->size += pad;
stub_entry->stub_offset = stub_entry->group->stub_sec->size;
}
if (info->emitrelocations)
{
stub_entry->group->stub_sec->reloc_count
+= ((PPC_HA (off) != 0)
+ (htab->opd_abi
? 2 + (htab->params->plt_static_chain
&& PPC_HA (off + 16) == PPC_HA (off))
: 1));
stub_entry->group->stub_sec->flags |= SEC_RELOC;
}
size = plt_stub_size (htab, stub_entry, off);
if (stub_entry->h != NULL
&& (stub_entry->h == htab->tls_get_addr_fd
|| stub_entry->h == htab->tls_get_addr)
&& htab->params->tls_get_addr_opt
&& stub_entry->stub_type == ppc_stub_plt_call_r2save)
{
/* After the bctrl, lr has been modified so we need to
emit .eh_frame info saying the return address is
on the stack. In fact we put the EH info specifying
that the return address is on the stack *at* the
call rather than after it, because the EH info for a
call needs to be specified by that point.
See libgcc/unwind-dw2.c execute_cfa_program. */
lr_used = stub_entry->stub_offset + size - 20;
/* The eh_frame info will consist of a DW_CFA_advance_loc
or variant, DW_CFA_offset_externed_sf, 65, -stackoff,
DW_CFA_advance_loc+4, DW_CFA_restore_extended, 65. */
delta = lr_used - stub_entry->group->lr_restore;
stub_entry->group->eh_size += eh_advance_size (delta) + 6;
stub_entry->group->lr_restore = size - 4;
}
break;
default:
BFD_FAIL ();
return FALSE;
}
stub_entry->group->stub_sec->size += size;