* [GOLD] PPC64_OPT_LOCALENTRY is incompatible with tail calls
@ 2020-09-26 11:08 Alan Modra
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From: Alan Modra @ 2020-09-26 11:08 UTC (permalink / raw)
To: binutils
Gold version of commit 3cd7c7d7ef.
* powerpc.cc (Target_powerpc): Rename power10_stubs_ to
power10_relocs_.
(Target_powerpc::set_power10_relocs): New accessor.
(Target_powerpc::set_power10_stubs): Delete.
(Target_powerpc::power10_stubs): Adjust.
(Target_powerpc::has_localentry0): New accessor.
(ld_0_11): New constant.
(glink_eh_frame_fde_64v1, glink_eh_frame_fde_64v2): Adjust.
(glink_eh_frame_fde_64v2_localentry0): New.
(Output_data_glink::pltresolve_size): Update.
(Output_data_glink::add_eh_frame): Use localentry0 version eh_frame.
(Output_data_glink::do_write): Move r2 save to start of ELFv2 stub
and only emit for has_localentry0. Don't use r2 in the stub.
(Target_powerpc::Scan::local, global): Adjust for
set_power10_relocs renaming.
(Target_powerpc::scan_relocs): Warn and reset plt_localentry0_.
diff --git a/gold/powerpc.cc b/gold/powerpc.cc
index 1020fa42f9..adbc120c14 100644
--- a/gold/powerpc.cc
+++ b/gold/powerpc.cc
@@ -647,7 +647,7 @@ class Target_powerpc : public Sized_target<size, big_endian>
glink_(NULL), rela_dyn_(NULL), copy_relocs_(),
tlsld_got_offset_(-1U),
stub_tables_(), branch_lookup_table_(), branch_info_(), tocsave_loc_(),
- power10_stubs_(false), plt_thread_safe_(false), plt_localentry0_(false),
+ power10_relocs_(false), plt_thread_safe_(false), plt_localentry0_(false),
plt_localentry0_init_(false), has_localentry0_(false),
has_tls_get_addr_opt_(false),
tprel_opt_(parameters->options().tls_optimize()),
@@ -1079,16 +1079,18 @@ class Target_powerpc : public Sized_target<size, big_endian>
sym->set_dynsym_index(-1U);
}
+ void
+ set_power10_relocs()
+ {
+ this->power10_relocs_ = true;
+ }
+
bool
power10_stubs() const
- { return this->power10_stubs_; }
-
- void
- set_power10_stubs()
{
- if (parameters->options().power10_stubs_enum()
- != General_options::POWER10_STUBS_NO)
- this->power10_stubs_ = true;
+ return (this->power10_relocs_
+ && (parameters->options().power10_stubs_enum()
+ != General_options::POWER10_STUBS_NO));
}
bool
@@ -1106,6 +1108,10 @@ class Target_powerpc : public Sized_target<size, big_endian>
plt_localentry0() const
{ return this->plt_localentry0_; }
+ bool
+ has_localentry0() const
+ { return this->has_localentry0_; }
+
void
set_has_localentry0()
{
@@ -1705,7 +1711,7 @@ class Target_powerpc : public Sized_target<size, big_endian>
Branches branch_info_;
Tocsave_loc tocsave_loc_;
- bool power10_stubs_;
+ bool power10_relocs_;
bool plt_thread_safe_;
bool plt_localentry0_;
bool plt_localentry0_init_;
@@ -4190,6 +4196,7 @@ static const uint32_t cmpwi_11_0 = 0x2c0b0000;
static const uint32_t cror_15_15_15 = 0x4def7b82;
static const uint32_t cror_31_31_31 = 0x4ffffb82;
static const uint32_t ld_0_1 = 0xe8010000;
+static const uint32_t ld_0_11 = 0xe80b0000;
static const uint32_t ld_0_12 = 0xe80c0000;
static const uint32_t ld_2_1 = 0xe8410000;
static const uint32_t ld_2_2 = 0xe8420000;
@@ -4572,9 +4579,9 @@ static const unsigned char glink_eh_frame_fde_64v1[] =
0, 0, 0, 0, // Replaced with offset to .glink.
0, 0, 0, 0, // Replaced with size of .glink.
0, // Augmentation size.
- elfcpp::DW_CFA_advance_loc + 1,
+ elfcpp::DW_CFA_advance_loc + 2,
elfcpp::DW_CFA_register, 65, 12,
- elfcpp::DW_CFA_advance_loc + 5,
+ elfcpp::DW_CFA_advance_loc + 4,
elfcpp::DW_CFA_restore_extended, 65
};
@@ -4584,9 +4591,20 @@ static const unsigned char glink_eh_frame_fde_64v2[] =
0, 0, 0, 0, // Replaced with offset to .glink.
0, 0, 0, 0, // Replaced with size of .glink.
0, // Augmentation size.
- elfcpp::DW_CFA_advance_loc + 1,
+ elfcpp::DW_CFA_advance_loc + 2,
elfcpp::DW_CFA_register, 65, 0,
- elfcpp::DW_CFA_advance_loc + 7,
+ elfcpp::DW_CFA_advance_loc + 2,
+ elfcpp::DW_CFA_restore_extended, 65
+};
+
+static const unsigned char glink_eh_frame_fde_64v2_localentry0[] =
+{
+ 0, 0, 0, 0, // Replaced with offset to .glink.
+ 0, 0, 0, 0, // Replaced with size of .glink.
+ 0, // Augmentation size.
+ elfcpp::DW_CFA_advance_loc + 3,
+ elfcpp::DW_CFA_register, 65, 0,
+ elfcpp::DW_CFA_advance_loc + 2,
elfcpp::DW_CFA_restore_extended, 65
};
@@ -5525,7 +5543,8 @@ class Output_data_glink : public Output_section_data
{
if (size == 64)
return (8
- + (this->targ_->abiversion() < 2 ? 11 * 4 : 14 * 4));
+ + (this->targ_->abiversion() < 2 ? 11 * 4
+ : this->targ_->has_localentry0() ? 14 * 4 : 13 * 4));
return 16 * 4;
}
@@ -5568,6 +5587,12 @@ Output_data_glink<size, big_endian>::add_eh_frame(Layout* layout)
sizeof (Eh_cie<64>::eh_frame_cie),
glink_eh_frame_fde_64v1,
sizeof (glink_eh_frame_fde_64v1));
+ else if (this->targ_->has_localentry0())
+ layout->add_eh_frame_for_plt(this,
+ Eh_cie<64>::eh_frame_cie,
+ sizeof (Eh_cie<64>::eh_frame_cie),
+ glink_eh_frame_fde_64v2_localentry0,
+ sizeof (glink_eh_frame_fde_64v2));
else
layout->add_eh_frame_for_plt(this,
Eh_cie<64>::eh_frame_cie,
@@ -6798,15 +6823,25 @@ Output_data_glink<size, big_endian>::do_write(Output_file* of)
}
else
{
+ if (this->targ_->has_localentry0())
+ {
+ write_insn<big_endian>(p, std_2_1 + 24), p += 4;
+ }
write_insn<big_endian>(p, mflr_0), p += 4;
write_insn<big_endian>(p, bcl_20_31), p += 4;
write_insn<big_endian>(p, mflr_11), p += 4;
- write_insn<big_endian>(p, std_2_1 + 24), p += 4;
- write_insn<big_endian>(p, ld_2_11 + l(-16)), p += 4;
write_insn<big_endian>(p, mtlr_0), p += 4;
+ if (this->targ_->has_localentry0())
+ {
+ write_insn<big_endian>(p, ld_0_11 + l(-20)), p += 4;
+ }
+ else
+ {
+ write_insn<big_endian>(p, ld_0_11 + l(-16)), p += 4;
+ }
write_insn<big_endian>(p, sub_12_12_11), p += 4;
- write_insn<big_endian>(p, add_11_2_11), p += 4;
- write_insn<big_endian>(p, addi_0_12 + l(-48)), p += 4;
+ write_insn<big_endian>(p, add_11_0_11), p += 4;
+ write_insn<big_endian>(p, addi_0_12 + l(-44)), p += 4;
write_insn<big_endian>(p, ld_12_11 + 0), p += 4;
write_insn<big_endian>(p, srdi_0_0_2), p += 4;
write_insn<big_endian>(p, mtctr_12), p += 4;
@@ -8451,7 +8486,7 @@ Target_powerpc<size, big_endian>::Scan::local(
case elfcpp::R_PPC64_GOT_TLSLD_PCREL34:
case elfcpp::R_PPC64_GOT_DTPREL_PCREL34:
case elfcpp::R_PPC64_GOT_TPREL_PCREL34:
- target->set_power10_stubs();
+ target->set_power10_relocs();
break;
default:
break;
@@ -9248,7 +9283,7 @@ Target_powerpc<size, big_endian>::Scan::global(
case elfcpp::R_PPC64_GOT_TLSLD_PCREL34:
case elfcpp::R_PPC64_GOT_DTPREL_PCREL34:
case elfcpp::R_PPC64_GOT_TPREL_PCREL34:
- target->set_power10_stubs();
+ target->set_power10_relocs();
break;
default:
break;
@@ -9590,6 +9625,13 @@ Target_powerpc<size, big_endian>::scan_relocs(
needs_special_offset_handling,
local_symbol_count,
plocal_symbols);
+
+ if (this->plt_localentry0_ && this->power10_relocs_)
+ {
+ gold_warning(_("--plt-localentry is incompatible with "
+ "power10 pc-relative code"));
+ this->plt_localentry0_ = false;
+ }
}
// Functor class for processing the global symbol table.
--
Alan Modra
Australia Development Lab, IBM
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