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binutils-gdb/include/elf/ppc.h
Alan Modra 23cedd1dc9 PowerPC inline PLT call support 
In addition to the existing relocs we need two more to mark all
instructions in the call sequence, PLTCALL on the call itself (plus
the toc restore insn for ppc64), and PLTSEQ on others.  All
relocations in a particular sequence have the same symbol.

Example ppc64 ELFv2 assembly:
 .reloc .,R_PPC64_PLTSEQ,puts
	std 2,24(1)
	addis 12,2,puts@plt@ha	# .reloc .,R_PPC64_PLT16_HA,puts
	ld 12,puts@plt@l(12)	# .reloc .,R_PPC64_PLT16_LO_DS,puts
 .reloc .,R_PPC64_PLTSEQ,puts
	mtctr 12
 .reloc .,R_PPC64_PLTCALL,puts
	bctrl
	ld 2,24(1)

Example ppc32 -fPIC assembly:
	addis 12,30,puts+32768@plt@ha # .reloc .,R_PPC_PLT16_HA,puts+0x8000
	lwz 12,12,puts+32768@plt@l    # .reloc .,R_PPC_PLT16_LO,puts+0x8000
 .reloc .,R_PPC_PLTSEQ,puts+32768
	mtctr 12
 .reloc .,R_PPC_PLTCALL,puts+32768
	bctrl

Marking sequences like this allows the linker to convert them to nops
and a direct call if the target symbol turns out to be local.

When the call is __tls_get_addr, each relocation shown above is paired
with an R_PPC*_TLSLD or R_PPC*_TLSGD reloc to additionally mark the
sequence for possible TLS optimization.  The TLSLD or TLSGD relocs are
emitted first.

include/
	* elf/ppc.h (R_PPC_PLTSEQ, R_PPC_PLTCALL): Define.
	* elf/ppc64.h (R_PPC64_PLTSEQ, R_PPC64_PLTCALL): Define.
bfd/
	* elf32-ppc.c (ppc_elf_howto_raw): Add PLTSEQ and PLTCALL howtos.
	(is_plt_seq_reloc): New function.
	(ppc_elf_check_relocs): Handle PLTSEQ and PLTCALL relocs.
	(ppc_elf_tls_optimize): Handle inline plt call sequence.
	(ppc_elf_relax_section): Handle PLTCALL reloc.
	(ppc_elf_relocate_section): Nop out inline plt call sequence when
	resolving locally.
	* elf64-ppc.c (ppc64_elf_howto_raw): Add R_PPC64_PLTSEQ and
	R_PPC64_PLTCALL entries.  Comment R_PPC64_TOCSAVE.
	(has_tls_get_addr_call): Correct comment.
	(is_branch_reloc): Add PLTCALL.
	(is_plt_seq_reloc): New function.
	(ppc64_elf_check_relocs): Handle PLT16_LO_DS reloc.  Set
	has_tls_reloc for R_PPC64_TLSGD and R_PPC64_TLSLD.  Create plt
	entry for R_PPC64_PLTCALL.
	(ppc64_elf_tls_optimize): Handle inline plt call sequence.
	(ppc_type_of_stub): Handle PLTCALL reloc.
	(toc_adjusting_stub_needed): Likewise.
	(ppc64_elf_relocate_section): Set "can_plt_call" for PLTCALL
	reloc insn.  Nop out inline plt call sequence when resolving
	locally.  Handle __tls_get_addr inline plt call optimization.
elfcpp/
	* powerpc.h (R_POWERPC_PLTSEQ, R_POWERPC_PLTCALL): Define.
gold/
	* powerpc.cc (Target_powerpc::Track_tls::maybe_skip_tls_get_addr_call):
	Handle inline plt sequence relocs.
	(Stub_table::Plt_stub_key::Plt_stub_key): Likewise.
	(Target_powerpc::Scan::reloc_needs_plt_for_ifunc): Likewise.
	(Target_powerpc::Relocate::relocate): Likewise.
2018-04-09 17:25:20 +09:30

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/* PPC ELF support for BFD.
Copyright (C) 1995-2018 Free Software Foundation, Inc.
By Michael Meissner, Cygnus Support, <meissner@cygnus.com>,
from information in the System V Application Binary Interface,
PowerPC Processor Supplement and the PowerPC Embedded Application
Binary Interface (eabi).
This file is part of BFD, the Binary File Descriptor library.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
MA 02110-1301, USA. */
/* This file holds definitions specific to the PPC ELF ABI. Note
that most of this is not actually implemented by BFD. */
#ifndef _ELF_PPC_H
#define _ELF_PPC_H
#include "elf/reloc-macros.h"
/* Relocations. */
START_RELOC_NUMBERS (elf_ppc_reloc_type)
RELOC_NUMBER (R_PPC_NONE, 0)
RELOC_NUMBER (R_PPC_ADDR32, 1)
RELOC_NUMBER (R_PPC_ADDR24, 2)
RELOC_NUMBER (R_PPC_ADDR16, 3)
RELOC_NUMBER (R_PPC_ADDR16_LO, 4)
RELOC_NUMBER (R_PPC_ADDR16_HI, 5)
RELOC_NUMBER (R_PPC_ADDR16_HA, 6)
RELOC_NUMBER (R_PPC_ADDR14, 7)
RELOC_NUMBER (R_PPC_ADDR14_BRTAKEN, 8)
RELOC_NUMBER (R_PPC_ADDR14_BRNTAKEN, 9)
RELOC_NUMBER (R_PPC_REL24, 10)
RELOC_NUMBER (R_PPC_REL14, 11)
RELOC_NUMBER (R_PPC_REL14_BRTAKEN, 12)
RELOC_NUMBER (R_PPC_REL14_BRNTAKEN, 13)
RELOC_NUMBER (R_PPC_GOT16, 14)
RELOC_NUMBER (R_PPC_GOT16_LO, 15)
RELOC_NUMBER (R_PPC_GOT16_HI, 16)
RELOC_NUMBER (R_PPC_GOT16_HA, 17)
RELOC_NUMBER (R_PPC_PLTREL24, 18)
RELOC_NUMBER (R_PPC_COPY, 19)
RELOC_NUMBER (R_PPC_GLOB_DAT, 20)
RELOC_NUMBER (R_PPC_JMP_SLOT, 21)
RELOC_NUMBER (R_PPC_RELATIVE, 22)
RELOC_NUMBER (R_PPC_LOCAL24PC, 23)
RELOC_NUMBER (R_PPC_UADDR32, 24)
RELOC_NUMBER (R_PPC_UADDR16, 25)
RELOC_NUMBER (R_PPC_REL32, 26)
RELOC_NUMBER (R_PPC_PLT32, 27)
RELOC_NUMBER (R_PPC_PLTREL32, 28)
RELOC_NUMBER (R_PPC_PLT16_LO, 29)
RELOC_NUMBER (R_PPC_PLT16_HI, 30)
RELOC_NUMBER (R_PPC_PLT16_HA, 31)
RELOC_NUMBER (R_PPC_SDAREL16, 32)
RELOC_NUMBER (R_PPC_SECTOFF, 33)
RELOC_NUMBER (R_PPC_SECTOFF_LO, 34)
RELOC_NUMBER (R_PPC_SECTOFF_HI, 35)
RELOC_NUMBER (R_PPC_SECTOFF_HA, 36)
RELOC_NUMBER (R_PPC_ADDR30, 37)
#ifndef RELOC_MACROS_GEN_FUNC
/* Relocations only used internally by ld. If you need to use these
reloc numbers, you can change them to some other unused value
without affecting the ABI. They will never appear in object files. */
RELOC_NUMBER (R_PPC_RELAX, 48)
RELOC_NUMBER (R_PPC_RELAX_PLT, 49)
RELOC_NUMBER (R_PPC_RELAX_PLTREL24, 50)
/* Reloc only used internally by gas. As above, value is unimportant. */
RELOC_NUMBER (R_PPC_16DX_HA, 51)
#endif
/* Relocs added to support TLS. */
RELOC_NUMBER (R_PPC_TLS, 67)
RELOC_NUMBER (R_PPC_DTPMOD32, 68)
RELOC_NUMBER (R_PPC_TPREL16, 69)
RELOC_NUMBER (R_PPC_TPREL16_LO, 70)
RELOC_NUMBER (R_PPC_TPREL16_HI, 71)
RELOC_NUMBER (R_PPC_TPREL16_HA, 72)
RELOC_NUMBER (R_PPC_TPREL32, 73)
RELOC_NUMBER (R_PPC_DTPREL16, 74)
RELOC_NUMBER (R_PPC_DTPREL16_LO, 75)
RELOC_NUMBER (R_PPC_DTPREL16_HI, 76)
RELOC_NUMBER (R_PPC_DTPREL16_HA, 77)
RELOC_NUMBER (R_PPC_DTPREL32, 78)
RELOC_NUMBER (R_PPC_GOT_TLSGD16, 79)
RELOC_NUMBER (R_PPC_GOT_TLSGD16_LO, 80)
RELOC_NUMBER (R_PPC_GOT_TLSGD16_HI, 81)
RELOC_NUMBER (R_PPC_GOT_TLSGD16_HA, 82)
RELOC_NUMBER (R_PPC_GOT_TLSLD16, 83)
RELOC_NUMBER (R_PPC_GOT_TLSLD16_LO, 84)
RELOC_NUMBER (R_PPC_GOT_TLSLD16_HI, 85)
RELOC_NUMBER (R_PPC_GOT_TLSLD16_HA, 86)
RELOC_NUMBER (R_PPC_GOT_TPREL16, 87)
RELOC_NUMBER (R_PPC_GOT_TPREL16_LO, 88)
RELOC_NUMBER (R_PPC_GOT_TPREL16_HI, 89)
RELOC_NUMBER (R_PPC_GOT_TPREL16_HA, 90)
RELOC_NUMBER (R_PPC_GOT_DTPREL16, 91)
RELOC_NUMBER (R_PPC_GOT_DTPREL16_LO, 92)
RELOC_NUMBER (R_PPC_GOT_DTPREL16_HI, 93)
RELOC_NUMBER (R_PPC_GOT_DTPREL16_HA, 94)
RELOC_NUMBER (R_PPC_TLSGD, 95)
RELOC_NUMBER (R_PPC_TLSLD, 96)
/* The remaining relocs are from the Embedded ELF ABI, and are not
in the SVR4 ELF ABI. */
RELOC_NUMBER (R_PPC_EMB_NADDR32, 101)
RELOC_NUMBER (R_PPC_EMB_NADDR16, 102)
RELOC_NUMBER (R_PPC_EMB_NADDR16_LO, 103)
RELOC_NUMBER (R_PPC_EMB_NADDR16_HI, 104)
RELOC_NUMBER (R_PPC_EMB_NADDR16_HA, 105)
RELOC_NUMBER (R_PPC_EMB_SDAI16, 106)
RELOC_NUMBER (R_PPC_EMB_SDA2I16, 107)
RELOC_NUMBER (R_PPC_EMB_SDA2REL, 108)
RELOC_NUMBER (R_PPC_EMB_SDA21, 109)
RELOC_NUMBER (R_PPC_EMB_MRKREF, 110)
RELOC_NUMBER (R_PPC_EMB_RELSEC16, 111)
RELOC_NUMBER (R_PPC_EMB_RELST_LO, 112)
RELOC_NUMBER (R_PPC_EMB_RELST_HI, 113)
RELOC_NUMBER (R_PPC_EMB_RELST_HA, 114)
RELOC_NUMBER (R_PPC_EMB_BIT_FLD, 115)
RELOC_NUMBER (R_PPC_EMB_RELSDA, 116)
/* Marker reloc for inline plt call insns. */
RELOC_NUMBER (R_PPC_PLTSEQ, 119)
RELOC_NUMBER (R_PPC_PLTCALL, 120)
/* PowerPC VLE relocations. */
RELOC_NUMBER (R_PPC_VLE_REL8, 216)
RELOC_NUMBER (R_PPC_VLE_REL15, 217)
RELOC_NUMBER (R_PPC_VLE_REL24, 218)
RELOC_NUMBER (R_PPC_VLE_LO16A, 219)
RELOC_NUMBER (R_PPC_VLE_LO16D, 220)
RELOC_NUMBER (R_PPC_VLE_HI16A, 221)
RELOC_NUMBER (R_PPC_VLE_HI16D, 222)
RELOC_NUMBER (R_PPC_VLE_HA16A, 223)
RELOC_NUMBER (R_PPC_VLE_HA16D, 224)
RELOC_NUMBER (R_PPC_VLE_SDA21, 225)
RELOC_NUMBER (R_PPC_VLE_SDA21_LO, 226)
RELOC_NUMBER (R_PPC_VLE_SDAREL_LO16A, 227)
RELOC_NUMBER (R_PPC_VLE_SDAREL_LO16D, 228)
RELOC_NUMBER (R_PPC_VLE_SDAREL_HI16A, 229)
RELOC_NUMBER (R_PPC_VLE_SDAREL_HI16D, 230)
RELOC_NUMBER (R_PPC_VLE_SDAREL_HA16A, 231)
RELOC_NUMBER (R_PPC_VLE_SDAREL_HA16D, 232)
RELOC_NUMBER (R_PPC_VLE_ADDR20, 233)
/* Power9 split rel16 for addpcis. */
RELOC_NUMBER (R_PPC_REL16DX_HA, 246)
/* Support STT_GNU_IFUNC plt calls. */
RELOC_NUMBER (R_PPC_IRELATIVE, 248)
/* These are GNU extensions used in PIC code sequences. */
RELOC_NUMBER (R_PPC_REL16, 249)
RELOC_NUMBER (R_PPC_REL16_LO, 250)
RELOC_NUMBER (R_PPC_REL16_HI, 251)
RELOC_NUMBER (R_PPC_REL16_HA, 252)
/* These are GNU extensions to enable C++ vtable garbage collection. */
RELOC_NUMBER (R_PPC_GNU_VTINHERIT, 253)
RELOC_NUMBER (R_PPC_GNU_VTENTRY, 254)
/* This is a phony reloc to handle any old fashioned TOC16 references
that may still be in object files. */
RELOC_NUMBER (R_PPC_TOC16, 255)
END_RELOC_NUMBERS (R_PPC_max)
#define IS_PPC_TLS_RELOC(R) \
((R) >= R_PPC_TLS && (R) <= R_PPC_GOT_DTPREL16_HA)
/* Specify the value of _GLOBAL_OFFSET_TABLE_. */
#define DT_PPC_GOT (DT_LOPROC)
/* Specify that tls descriptors should be optimized. */
#define DT_PPC_OPT (DT_LOPROC + 1)
#define PPC_OPT_TLS 1
/* Processor specific flags for the ELF header e_flags field. */
#define EF_PPC_EMB 0x80000000 /* PowerPC embedded flag. */
#define EF_PPC_RELOCATABLE 0x00010000 /* PowerPC -mrelocatable flag. */
#define EF_PPC_RELOCATABLE_LIB 0x00008000 /* PowerPC -mrelocatable-lib flag. */
/* Processor specific program headers, p_flags field. */
#define PF_PPC_VLE 0x10000000 /* PowerPC VLE. */
/* Processor specific section headers, sh_flags field. */
#define SHF_PPC_VLE 0x10000000 /* PowerPC VLE text section. */
/* Processor specific section headers, sh_type field. */
#define SHT_ORDERED SHT_HIPROC /* Link editor is to sort the \
entries in this section \
based on the address \
specified in the associated \
symbol table entry. */
/* APUinfo note section. */
#define APUINFO_SECTION_NAME ".PPC.EMB.apuinfo"
#define APUINFO_LABEL "APUinfo"
#define PPC_APUINFO_ISEL 0x40
#define PPC_APUINFO_PMR 0x41
#define PPC_APUINFO_RFMCI 0x42
#define PPC_APUINFO_CACHELCK 0x43
#define PPC_APUINFO_SPE 0x100
#define PPC_APUINFO_EFS 0x101
#define PPC_APUINFO_BRLOCK 0x102
#define PPC_APUINFO_VLE 0x104
/* Object attribute tags. */
enum
{
/* 0-3 are generic. */
/* FP ABI, low 2 bits:
1 for double precision hard-float,
2 for soft-float,
3 for single precision hard-float.
0 for not tagged or not using any ABIs affected by the differences.
Next 2 bits:
1 for ibm long double
2 for 64-bit long double
3 for IEEE long double.
0 for not tagged or not using any ABIs affected by the differences. */
Tag_GNU_Power_ABI_FP = 4,
/* Value 1 for general purpose registers only, 2 for AltiVec
registers, 3 for SPE registers; 0 for not tagged or not using any
ABIs affected by the differences. */
Tag_GNU_Power_ABI_Vector = 8,
/* Value 1 for ABIs using r3/r4 for returning structures <= 8 bytes,
2 for ABIs using memory; 0 for not tagged or not using any ABIs
affected by the differences. */
Tag_GNU_Power_ABI_Struct_Return = 12
};
#endif /* _ELF_PPC_H */
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