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8155b8539b
This is the original discussion, https://github.com/riscv/riscv-elf-psabi-doc/pull/190 And here is the glibc part, https://sourceware.org/pipermail/libc-alpha/2021-August/129931.html For binutils part, we need to support a new direcitve: .variant_cc. The function symbol marked by .variant_cc means it need to be resolved directly without resolver for dynamic linker. We also add a new dynamic entry, STO_RISCV_VARIANT_CC, to indicate there are symbols with the special attribute in the dynamic symbol table of the object. I heard that llvm already have supported this in their mainline, so I think it's time to commit this. bfd/ * elfnn-riscv.c (riscv_elf_link_hash_table): Added variant_cc flag. It is used to check if relocations for variant CC symbols may be present. (allocate_dynrelocs): If the symbol has STO_RISCV_VARIANT_CC flag, then raise the variant_cc flag of riscv_elf_link_hash_table. (riscv_elf_size_dynamic_sections): Added dynamic entry for variant_cc. (riscv_elf_merge_symbol_attribute): New function, used to merge non-visibility st_other attributes, including STO_RISCV_VARIANT_CC. binutils/ * readelf.c (get_riscv_dynamic_type): New function. (get_dynamic_type): Called get_riscv_dynamic_type for riscv targets. (get_riscv_symbol_other): New function. (get_symbol_other): Called get_riscv_symbol_other for riscv targets. gas/ * config/tc-riscv.c (s_variant_cc): Marked symbol that it follows a variant CC convention. (riscv_elf_copy_symbol_attributes): Same as elf_copy_symbol_attributes, but without copying st_other. If a function symbol has special st_other value set via directives, then attaching an IFUNC resolver to that symbol should not override the st_other setting. (riscv_pseudo_table): Support variant_cc diretive. * config/tc-riscv.h (OBJ_COPY_SYMBOL_ATTRIBUTES): Defined. * testsuite/gas/riscv/variant_cc-set.d: New testcase. * testsuite/gas/riscv/variant_cc-set.s: Likewise. * testsuite/gas/riscv/variant_cc.d: Likewise. * testsuite/gas/riscv/variant_cc.s: Likewise. include/ * elf/riscv.h (DT_RISCV_VARIANT_CC): Defined to (DT_LOPROC + 1). (STO_RISCV_VARIANT_CC): Defined to 0x80. ld/ * testsuite/ld-riscv-elf/variant_cc-1.s: New testcase. * testsuite/ld-riscv-elf/variant_cc-2.s: Likewise. * testsuite/ld-riscv-elf/variant_cc-now.d: Likewise. * testsuite/ld-riscv-elf/variant_cc-r.d: Likewise. * testsuite/ld-riscv-elf/variant_cc-shared.d: Likewise. * testsuite/ld-riscv-elf/ld-riscv-elf.exp: Updated.
147 lines
4.7 KiB
C
147 lines
4.7 KiB
C
/* RISC-V ELF support for BFD.
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Copyright (C) 2011-2021 Free Software Foundation, Inc.
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Contributed by Andrew Waterman (andrew@sifive.com).
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Based on MIPS ELF support for BFD, by Ian Lance Taylor.
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This file is part of BFD, the Binary File Descriptor library.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; see the file COPYING3. If not,
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see <http://www.gnu.org/licenses/>. */
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/* This file holds definitions specific to the RISCV ELF ABI. Note
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that most of this is not actually implemented by BFD. */
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#ifndef _ELF_RISCV_H
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#define _ELF_RISCV_H
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#include "elf/reloc-macros.h"
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#include "libiberty.h"
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/* Relocation types. */
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START_RELOC_NUMBERS (elf_riscv_reloc_type)
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/* Relocation types used by the dynamic linker. */
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RELOC_NUMBER (R_RISCV_NONE, 0)
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RELOC_NUMBER (R_RISCV_32, 1)
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RELOC_NUMBER (R_RISCV_64, 2)
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RELOC_NUMBER (R_RISCV_RELATIVE, 3)
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RELOC_NUMBER (R_RISCV_COPY, 4)
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RELOC_NUMBER (R_RISCV_JUMP_SLOT, 5)
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RELOC_NUMBER (R_RISCV_TLS_DTPMOD32, 6)
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RELOC_NUMBER (R_RISCV_TLS_DTPMOD64, 7)
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RELOC_NUMBER (R_RISCV_TLS_DTPREL32, 8)
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RELOC_NUMBER (R_RISCV_TLS_DTPREL64, 9)
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RELOC_NUMBER (R_RISCV_TLS_TPREL32, 10)
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RELOC_NUMBER (R_RISCV_TLS_TPREL64, 11)
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/* Relocation types not used by the dynamic linker. */
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RELOC_NUMBER (R_RISCV_BRANCH, 16)
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RELOC_NUMBER (R_RISCV_JAL, 17)
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RELOC_NUMBER (R_RISCV_CALL, 18)
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RELOC_NUMBER (R_RISCV_CALL_PLT, 19)
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RELOC_NUMBER (R_RISCV_GOT_HI20, 20)
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RELOC_NUMBER (R_RISCV_TLS_GOT_HI20, 21)
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RELOC_NUMBER (R_RISCV_TLS_GD_HI20, 22)
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RELOC_NUMBER (R_RISCV_PCREL_HI20, 23)
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RELOC_NUMBER (R_RISCV_PCREL_LO12_I, 24)
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RELOC_NUMBER (R_RISCV_PCREL_LO12_S, 25)
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RELOC_NUMBER (R_RISCV_HI20, 26)
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RELOC_NUMBER (R_RISCV_LO12_I, 27)
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RELOC_NUMBER (R_RISCV_LO12_S, 28)
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RELOC_NUMBER (R_RISCV_TPREL_HI20, 29)
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RELOC_NUMBER (R_RISCV_TPREL_LO12_I, 30)
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RELOC_NUMBER (R_RISCV_TPREL_LO12_S, 31)
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RELOC_NUMBER (R_RISCV_TPREL_ADD, 32)
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RELOC_NUMBER (R_RISCV_ADD8, 33)
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RELOC_NUMBER (R_RISCV_ADD16, 34)
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RELOC_NUMBER (R_RISCV_ADD32, 35)
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RELOC_NUMBER (R_RISCV_ADD64, 36)
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RELOC_NUMBER (R_RISCV_SUB8, 37)
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RELOC_NUMBER (R_RISCV_SUB16, 38)
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RELOC_NUMBER (R_RISCV_SUB32, 39)
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RELOC_NUMBER (R_RISCV_SUB64, 40)
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RELOC_NUMBER (R_RISCV_GNU_VTINHERIT, 41)
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RELOC_NUMBER (R_RISCV_GNU_VTENTRY, 42)
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RELOC_NUMBER (R_RISCV_ALIGN, 43)
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RELOC_NUMBER (R_RISCV_RVC_BRANCH, 44)
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RELOC_NUMBER (R_RISCV_RVC_JUMP, 45)
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RELOC_NUMBER (R_RISCV_RVC_LUI, 46)
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RELOC_NUMBER (R_RISCV_GPREL_I, 47)
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RELOC_NUMBER (R_RISCV_GPREL_S, 48)
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RELOC_NUMBER (R_RISCV_TPREL_I, 49)
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RELOC_NUMBER (R_RISCV_TPREL_S, 50)
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RELOC_NUMBER (R_RISCV_RELAX, 51)
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RELOC_NUMBER (R_RISCV_SUB6, 52)
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RELOC_NUMBER (R_RISCV_SET6, 53)
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RELOC_NUMBER (R_RISCV_SET8, 54)
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RELOC_NUMBER (R_RISCV_SET16, 55)
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RELOC_NUMBER (R_RISCV_SET32, 56)
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RELOC_NUMBER (R_RISCV_32_PCREL, 57)
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RELOC_NUMBER (R_RISCV_IRELATIVE, 58)
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END_RELOC_NUMBERS (R_RISCV_max)
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/* Processor specific flags for the ELF header e_flags field. */
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/* File may contain compressed instructions. */
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#define EF_RISCV_RVC 0x0001
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/* Which floating-point ABI a file uses. */
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#define EF_RISCV_FLOAT_ABI 0x0006
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/* File uses the soft-float ABI. */
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#define EF_RISCV_FLOAT_ABI_SOFT 0x0000
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/* File uses the single-float ABI. */
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#define EF_RISCV_FLOAT_ABI_SINGLE 0x0002
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/* File uses the double-float ABI. */
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#define EF_RISCV_FLOAT_ABI_DOUBLE 0x0004
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/* File uses the quad-float ABI. */
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#define EF_RISCV_FLOAT_ABI_QUAD 0x0006
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/* File uses the 32E base integer instruction. */
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#define EF_RISCV_RVE 0x0008
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/* The name of the global pointer symbol. */
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#define RISCV_GP_SYMBOL "__global_pointer$"
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/* Processor specific dynamic array tags. */
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#define DT_RISCV_VARIANT_CC (DT_LOPROC + 1)
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/* RISC-V specific values for st_other. */
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#define STO_RISCV_VARIANT_CC 0x80
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/* Additional section types. */
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#define SHT_RISCV_ATTRIBUTES 0x70000003 /* Section holds attributes. */
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/* Processor specific program header types. */
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/* Location of RISC-V ELF attribute section. */
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#define PT_RISCV_ATTRIBUTES 0x70000003
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/* Object attributes. */
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enum
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{
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/* 0-3 are generic. */
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Tag_RISCV_stack_align = 4,
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Tag_RISCV_arch = 5,
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Tag_RISCV_unaligned_access = 6,
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Tag_RISCV_priv_spec = 8,
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Tag_RISCV_priv_spec_minor = 10,
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Tag_RISCV_priv_spec_revision = 12
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};
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#endif /* _ELF_RISCV_H */
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