[GOLD] PowerPC tls_get_addr_optimize
This implements the special __tls_get_addr_opt call stub for powerpc
gold that returns __thread variable addresses without actually making
a call to __tls_get_addr in most cases. Shared libraries that are
loaded at program load time (ie. dlopen is not used) have a known
layout for their __thread variables, and thus DTPMOD64/DPTREL64 pairs
describing those variables can be set up by ld.so for the
__tls_get_addr_opt call stub fast exit.
Ref https://sourceware.org/ml/libc-alpha/2015-03/msg00626.html
I really, really wish I'd used a differently versioned __tls_get_addr
symbol than the base symbol to indicate glibc support for the
optimized call, rather than having glibc export __tls_get_addr_opt. A
lot of the messing around here, flipping symbols from __tls_get_addr
to __tls_get_addr_opt, is caused by that decision. About the only
benefit is that a user can see at a glance that their disassembled
code is calling __tls_get_addr via the fancy call stub.. Anyway, we
need references to __tls_get_addr to seem like they were to
__tls_get_addr_opt, and in cases like the tsan interceptor, a
definition of __tls_get_addr to seem like one of __tls_get_addr_opt
as well. That's the reason for Symbol::clear_in_reg and
Symbol_table::clone, and why symbols are substituted in Scan::global
and other places dealing with dynamic linking.
elfcpp/
* elfcpp.h (DT_PPC_OPT): Define.
* powerpc.h (PPC_OPT_TLS): Define.
gold/
* options.h (tls_get_addr_optimize): New option.
* symtab.h (Symbol::clear_in_reg, clone): New functions.
(Sized_symbol::clone): New function.
(Symbol_table::clone): New function.
* resolve.cc (Symbol::clone, Sized_symbol::clone): New functions.
* powerpc.cc (Target_powerpc::has_tls_get_addr_opt_,
tls_get_addr_, tls_get_addr_opt_): New vars.
(Target_powerpc::tls_get_addr_opt, tls_get_addr,
is_tls_get_addr_opt, replace_tls_get_addr,
set_has_tls_get_addr_opt, stk_linker): New functions.
(Target_powerpc::Track_tls::maybe_skip_tls_get_addr_call): Add
target param. Update callers. Compare symbols rather than names.
(Target_powerpc::do_define_standard_symbols): Init tls_get_addr_
and tls_get_addr_opt_.
(Target_powerpc::Branch_info::mark_pltcall): Translate tls_get_addr
sym to tls_get_addr_opt.
(Target_powerpc::Branch_info::make_stub): Likewise.
(Stub_table::define_stub_syms): Likewise.
(Target_powerpc::Scan::global): Likewise.
(Target_powerpc::Relocate::relocate): Likewise.
(add_3_12_2, add_3_12_13, bctrl, beqlr, cmpdi_11_0, cmpwi_11_0,
ld_11_1, ld_11_3, ld_12_3, lwz_11_3, lwz_12_3, mr_0_3, mr_3_0,
mtlr_11, std_11_1): New constants.
(Stub_table::eh_frame_added_): Delete.
(Stub_table::tls_get_addr_opt_bctrl_, plt_fde_len_, plt_fde_): New vars.
(Stub_table::init_plt_fde): New functions.
(Stub_table::add_eh_frame, replace_eh_frame): Move definition out
of line. Init and use plt_fde_.
(Stub_table::plt_call_size): Return size for tls_get_addr stub.
Extract alignment code to..
(Stub_table::plt_call_align): ..this new function. Adjust all callers.
(Stub_table::add_plt_call_entry): Set has_tls_get_addr_opt and
tls_get_addr_opt_bctrl, and align after that.
(Stub_table::do_write): Write out tls_get_addr stub.
(Target_powerpc::do_finalize_sections): Emit DT_PPC_OPT
PPC_OPT_TLS/PPC64_OPT_TLS bit.
(Target_powerpc::Relocate::relocate): Don't check for or modify
nop following bl for tls_get_addr stub.
2017-08-29 14:25:33 +08:00
|
|
|
|
2017-08-29 Alan Modra <amodra@gmail.com>
|
|
|
|
|
|
|
|
|
|
|
|
* elfcpp.h (DT_PPC_OPT): Define.
|
|
|
|
|
|
* powerpc.h (PPC_OPT_TLS): Define.
|
|
|
|
|
|
|
2017-07-29 04:39:42 +08:00
|
|
|
|
2017-07-28 H.J. Lu <hongjiu.lu@intel.com>
|
|
|
|
|
|
|
|
|
|
|
|
PR gold/21857
|
|
|
|
|
|
* elfcpp.h (Chdr_write): Add put_ch_reserved.
|
|
|
|
|
|
(Chdr_write<64, true>::put_ch_reserved): New.
|
|
|
|
|
|
(Chdr_write<64, false>::put_ch_reserved): Likewise.
|
|
|
|
|
|
|
2017-07-03 18:00:24 +08:00
|
|
|
|
2017-07-03 Alan Modra <amodra@gmail.com>
|
|
|
|
|
|
|
2017-07-03 20:16:59 +08:00
|
|
|
|
* dwarf.h (DW_FIRST_IDX, DW_IDX, DW_IDX_DUP, DW_END_IDX): Define,
|
|
|
|
|
|
and undefine after using.
|
2017-07-03 18:00:24 +08:00
|
|
|
|
|
2017-06-23 19:09:43 +08:00
|
|
|
|
2017-06-21 Alan Modra <amodra@gmail.com>
|
|
|
|
|
|
|
|
|
|
|
|
* elfcpp.h (DT_PPC64_OPT): Define.
|
|
|
|
|
|
* powerpc.h (PPC64_OPT_TLS, PPC64_OPT_MULTI_TOC,
|
|
|
|
|
|
PPC64_OPT_LOCALENTRY): Define.
|
|
|
|
|
|
|
2017-06-26 17:07:17 +08:00
|
|
|
|
2017-06-20 Andreas Krebbel <krebbel@linux.vnet.ibm.com>
|
|
|
|
|
|
|
|
|
|
|
|
* elfcpp.h (enum PT): Add PT_S390_PGSTE to enum.
|
|
|
|
|
|
|
2017-01-02 11:36:43 +08:00
|
|
|
|
2017-01-02 Alan Modra <amodra@gmail.com>
|
|
|
|
|
|
|
|
|
|
|
|
Update year range in copyright notice of all files.
|
|
|
|
|
|
|
2017-01-02 11:25:05 +08:00
|
|
|
|
For older changes see ChangeLog-2016
|
2016-01-01 18:44:31 +08:00
|
|
|
|
|
2017-01-02 11:25:05 +08:00
|
|
|
|
Copyright (C) 2017 Free Software Foundation, Inc.
|
2016-01-01 18:44:31 +08:00
|
|
|
|
|
|
|
|
|
|
Copying and distribution of this file, with or without modification,
|
|
|
|
|
|
are permitted in any medium without royalty provided the copyright
|
|
|
|
|
|
notice and this notice are preserved.
|
|
|
|
|
|
|
|
|
|
|
|
Local Variables:
|
|
|
|
|
|
mode: change-log
|
|
|
|
|
|
left-margin: 8
|
|
|
|
|
|
fill-column: 74
|
|
|
|
|
|
version-control: never
|
|
|
|
|
|
End:
|
