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gnu / binutils-gdb / a13af434cfadb743e16b72ffaf716508b51f9d4a / . / bfd / elfxx-riscv.c
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/* RISC-V-specific support for ELF.
Copyright (C) 2011-2021 Free Software Foundation, Inc.
Contributed by Andrew Waterman (andrew@sifive.com).
Based on TILE-Gx and MIPS targets.
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; see the file COPYING3. If not,
see <http://www.gnu.org/licenses/>. */
#include "sysdep.h"
#include "bfd.h"
#include "libbfd.h"
#include "elf-bfd.h"
#include "elf/riscv.h"
#include "opcode/riscv.h"
#include "libiberty.h"
#include "elfxx-riscv.h"
#include "safe-ctype.h"
#define MINUS_ONE ((bfd_vma)0 - 1)
/* Special handler for ADD/SUB relocations that allows them to be filled out
both in the pre-linked and post-linked file. This is necessary to make
pre-linked debug info work, as due to linker relaxations we need to emit
relocations for the debug info. */
static bfd_reloc_status_type riscv_elf_add_sub_reloc
(bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
/* The relocation table used for SHT_RELA sections. */
static reloc_howto_type howto_table[] =
{
/* No relocation. */
HOWTO (R_RISCV_NONE, /* type */
0, /* rightshift */
3, /* size */
0, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_RISCV_NONE", /* name */
false, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
false), /* pcrel_offset */
/* 32 bit relocation. */
HOWTO (R_RISCV_32, /* type */
0, /* rightshift */
2, /* size */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_RISCV_32", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xffffffff, /* dst_mask */
false), /* pcrel_offset */
/* 64 bit relocation. */
HOWTO (R_RISCV_64, /* type */
0, /* rightshift */
4, /* size */
64, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_RISCV_64", /* name */
false, /* partial_inplace */
0, /* src_mask */
MINUS_ONE, /* dst_mask */
false), /* pcrel_offset */
/* Relocation against a local symbol in a shared object. */
HOWTO (R_RISCV_RELATIVE, /* type */
0, /* rightshift */
2, /* size */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_RISCV_RELATIVE", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xffffffff, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_RISCV_COPY, /* type */
0, /* rightshift */
0, /* this one is variable size */
0, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_RISCV_COPY", /* name */
false, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_RISCV_JUMP_SLOT, /* type */
0, /* rightshift */
4, /* size */
64, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_RISCV_JUMP_SLOT", /* name */
false, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
false), /* pcrel_offset */
/* Dynamic TLS relocations. */
HOWTO (R_RISCV_TLS_DTPMOD32, /* type */
0, /* rightshift */
2, /* size */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_RISCV_TLS_DTPMOD32", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xffffffff, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_RISCV_TLS_DTPMOD64, /* type */
0, /* rightshift */
4, /* size */
64, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_RISCV_TLS_DTPMOD64", /* name */
false, /* partial_inplace */
0, /* src_mask */
MINUS_ONE, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_RISCV_TLS_DTPREL32, /* type */
0, /* rightshift */
2, /* size */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_RISCV_TLS_DTPREL32", /* name */
true, /* partial_inplace */
0, /* src_mask */
0xffffffff, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_RISCV_TLS_DTPREL64, /* type */
0, /* rightshift */
4, /* size */
64, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_RISCV_TLS_DTPREL64", /* name */
true, /* partial_inplace */
0, /* src_mask */
MINUS_ONE, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_RISCV_TLS_TPREL32, /* type */
0, /* rightshift */
2, /* size */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_RISCV_TLS_TPREL32", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xffffffff, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_RISCV_TLS_TPREL64, /* type */
0, /* rightshift */
4, /* size */
64, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_RISCV_TLS_TPREL64", /* name */
false, /* partial_inplace */
0, /* src_mask */
MINUS_ONE, /* dst_mask */
false), /* pcrel_offset */
/* Reserved for future relocs that the dynamic linker must understand. */
EMPTY_HOWTO (12),
EMPTY_HOWTO (13),
EMPTY_HOWTO (14),
EMPTY_HOWTO (15),
/* 12-bit PC-relative branch offset. */
HOWTO (R_RISCV_BRANCH, /* type */
0, /* rightshift */
2, /* size */
32, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_RISCV_BRANCH", /* name */
false, /* partial_inplace */
0, /* src_mask */
ENCODE_BTYPE_IMM (-1U), /* dst_mask */
true), /* pcrel_offset */
/* 20-bit PC-relative jump offset. */
HOWTO (R_RISCV_JAL, /* type */
0, /* rightshift */
2, /* size */
32, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_RISCV_JAL", /* name */
false, /* partial_inplace */
0, /* src_mask */
ENCODE_JTYPE_IMM (-1U), /* dst_mask */
true), /* pcrel_offset */
/* 32-bit PC-relative function call (AUIPC/JALR). */
HOWTO (R_RISCV_CALL, /* type */
0, /* rightshift */
4, /* size */
64, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_RISCV_CALL", /* name */
false, /* partial_inplace */
0, /* src_mask */
ENCODE_UTYPE_IMM (-1U) | ((bfd_vma) ENCODE_ITYPE_IMM (-1U) << 32),
/* dst_mask */
true), /* pcrel_offset */
/* Like R_RISCV_CALL, but not locally binding. */
HOWTO (R_RISCV_CALL_PLT, /* type */
0, /* rightshift */
4, /* size */
64, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_RISCV_CALL_PLT", /* name */
false, /* partial_inplace */
0, /* src_mask */
ENCODE_UTYPE_IMM (-1U) | ((bfd_vma) ENCODE_ITYPE_IMM (-1U) << 32),
/* dst_mask */
true), /* pcrel_offset */
/* High 20 bits of 32-bit PC-relative GOT access. */
HOWTO (R_RISCV_GOT_HI20, /* type */
0, /* rightshift */
2, /* size */
32, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_RISCV_GOT_HI20", /* name */
false, /* partial_inplace */
0, /* src_mask */
ENCODE_UTYPE_IMM (-1U), /* dst_mask */
false), /* pcrel_offset */
/* High 20 bits of 32-bit PC-relative TLS IE GOT access. */
HOWTO (R_RISCV_TLS_GOT_HI20, /* type */
0, /* rightshift */
2, /* size */
32, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_RISCV_TLS_GOT_HI20", /* name */
false, /* partial_inplace */
0, /* src_mask */
ENCODE_UTYPE_IMM (-1U), /* dst_mask */
false), /* pcrel_offset */
/* High 20 bits of 32-bit PC-relative TLS GD GOT reference. */
HOWTO (R_RISCV_TLS_GD_HI20, /* type */
0, /* rightshift */
2, /* size */
32, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_RISCV_TLS_GD_HI20", /* name */
false, /* partial_inplace */
0, /* src_mask */
ENCODE_UTYPE_IMM (-1U), /* dst_mask */
false), /* pcrel_offset */
/* High 20 bits of 32-bit PC-relative reference. */
HOWTO (R_RISCV_PCREL_HI20, /* type */
0, /* rightshift */
2, /* size */
32, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_RISCV_PCREL_HI20", /* name */
false, /* partial_inplace */
0, /* src_mask */
ENCODE_UTYPE_IMM (-1U), /* dst_mask */
true), /* pcrel_offset */
/* Low 12 bits of a 32-bit PC-relative load or add. */
HOWTO (R_RISCV_PCREL_LO12_I, /* type */
0, /* rightshift */
2, /* size */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_RISCV_PCREL_LO12_I", /* name */
false, /* partial_inplace */
0, /* src_mask */
ENCODE_ITYPE_IMM (-1U), /* dst_mask */
false), /* pcrel_offset */
/* Low 12 bits of a 32-bit PC-relative store. */
HOWTO (R_RISCV_PCREL_LO12_S, /* type */
0, /* rightshift */
2, /* size */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_RISCV_PCREL_LO12_S", /* name */
false, /* partial_inplace */
0, /* src_mask */
ENCODE_STYPE_IMM (-1U), /* dst_mask */
false), /* pcrel_offset */
/* High 20 bits of 32-bit absolute address. */
HOWTO (R_RISCV_HI20, /* type */
0, /* rightshift */
2, /* size */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_RISCV_HI20", /* name */
false, /* partial_inplace */
0, /* src_mask */
ENCODE_UTYPE_IMM (-1U), /* dst_mask */
false), /* pcrel_offset */
/* High 12 bits of 32-bit load or add. */
HOWTO (R_RISCV_LO12_I, /* type */
0, /* rightshift */
2, /* size */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_RISCV_LO12_I", /* name */
false, /* partial_inplace */
0, /* src_mask */
ENCODE_ITYPE_IMM (-1U), /* dst_mask */
false), /* pcrel_offset */
/* High 12 bits of 32-bit store. */
HOWTO (R_RISCV_LO12_S, /* type */
0, /* rightshift */
2, /* size */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_RISCV_LO12_S", /* name */
false, /* partial_inplace */
0, /* src_mask */
ENCODE_STYPE_IMM (-1U), /* dst_mask */
false), /* pcrel_offset */
/* High 20 bits of TLS LE thread pointer offset. */
HOWTO (R_RISCV_TPREL_HI20, /* type */
0, /* rightshift */
2, /* size */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_RISCV_TPREL_HI20", /* name */
true, /* partial_inplace */
0, /* src_mask */
ENCODE_UTYPE_IMM (-1U), /* dst_mask */
false), /* pcrel_offset */
/* Low 12 bits of TLS LE thread pointer offset for loads and adds. */
HOWTO (R_RISCV_TPREL_LO12_I, /* type */
0, /* rightshift */
2, /* size */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_RISCV_TPREL_LO12_I", /* name */
false, /* partial_inplace */
0, /* src_mask */
ENCODE_ITYPE_IMM (-1U), /* dst_mask */
false), /* pcrel_offset */
/* Low 12 bits of TLS LE thread pointer offset for stores. */
HOWTO (R_RISCV_TPREL_LO12_S, /* type */
0, /* rightshift */
2, /* size */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_RISCV_TPREL_LO12_S", /* name */
false, /* partial_inplace */
0, /* src_mask */
ENCODE_STYPE_IMM (-1U), /* dst_mask */
false), /* pcrel_offset */
/* TLS LE thread pointer usage. May be relaxed. */
HOWTO (R_RISCV_TPREL_ADD, /* type */
0, /* rightshift */
3, /* size */
0, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_RISCV_TPREL_ADD", /* name */
false, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
false), /* pcrel_offset */
/* 8-bit in-place addition, for local label subtraction. */
HOWTO (R_RISCV_ADD8, /* type */
0, /* rightshift */
0, /* size */
8, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
riscv_elf_add_sub_reloc, /* special_function */
"R_RISCV_ADD8", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xff, /* dst_mask */
false), /* pcrel_offset */
/* 16-bit in-place addition, for local label subtraction. */
HOWTO (R_RISCV_ADD16, /* type */
0, /* rightshift */
1, /* size */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
riscv_elf_add_sub_reloc, /* special_function */
"R_RISCV_ADD16", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
/* 32-bit in-place addition, for local label subtraction. */
HOWTO (R_RISCV_ADD32, /* type */
0, /* rightshift */
2, /* size */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
riscv_elf_add_sub_reloc, /* special_function */
"R_RISCV_ADD32", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xffffffff, /* dst_mask */
false), /* pcrel_offset */
/* 64-bit in-place addition, for local label subtraction. */
HOWTO (R_RISCV_ADD64, /* type */
0, /* rightshift */
4, /* size */
64, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
riscv_elf_add_sub_reloc, /* special_function */
"R_RISCV_ADD64", /* name */
false, /* partial_inplace */
0, /* src_mask */
MINUS_ONE, /* dst_mask */
false), /* pcrel_offset */
/* 8-bit in-place addition, for local label subtraction. */
HOWTO (R_RISCV_SUB8, /* type */
0, /* rightshift */
0, /* size */
8, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
riscv_elf_add_sub_reloc, /* special_function */
"R_RISCV_SUB8", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xff, /* dst_mask */
false), /* pcrel_offset */
/* 16-bit in-place addition, for local label subtraction. */
HOWTO (R_RISCV_SUB16, /* type */
0, /* rightshift */
1, /* size */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
riscv_elf_add_sub_reloc, /* special_function */
"R_RISCV_SUB16", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
/* 32-bit in-place addition, for local label subtraction. */
HOWTO (R_RISCV_SUB32, /* type */
0, /* rightshift */
2, /* size */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
riscv_elf_add_sub_reloc, /* special_function */
"R_RISCV_SUB32", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xffffffff, /* dst_mask */
false), /* pcrel_offset */
/* 64-bit in-place addition, for local label subtraction. */
HOWTO (R_RISCV_SUB64, /* type */
0, /* rightshift */
4, /* size */
64, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
riscv_elf_add_sub_reloc, /* special_function */
"R_RISCV_SUB64", /* name */
false, /* partial_inplace */
0, /* src_mask */
MINUS_ONE, /* dst_mask */
false), /* pcrel_offset */
/* GNU extension to record C++ vtable hierarchy */
HOWTO (R_RISCV_GNU_VTINHERIT, /* type */
0, /* rightshift */
4, /* size */
0, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
NULL, /* special_function */
"R_RISCV_GNU_VTINHERIT", /* name */
false, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
false), /* pcrel_offset */
/* GNU extension to record C++ vtable member usage */
HOWTO (R_RISCV_GNU_VTENTRY, /* type */
0, /* rightshift */
4, /* size */
0, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
_bfd_elf_rel_vtable_reloc_fn, /* special_function */
"R_RISCV_GNU_VTENTRY", /* name */
false, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
false), /* pcrel_offset */
/* Indicates an alignment statement. The addend field encodes how many
bytes of NOPs follow the statement. The desired alignment is the
addend rounded up to the next power of two. */
HOWTO (R_RISCV_ALIGN, /* type */
0, /* rightshift */
3, /* size */
0, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_RISCV_ALIGN", /* name */
false, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
false), /* pcrel_offset */
/* 8-bit PC-relative branch offset. */
HOWTO (R_RISCV_RVC_BRANCH, /* type */
0, /* rightshift */
1, /* size */
16, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_RISCV_RVC_BRANCH", /* name */
false, /* partial_inplace */
0, /* src_mask */
ENCODE_CBTYPE_IMM (-1U), /* dst_mask */
true), /* pcrel_offset */
/* 11-bit PC-relative jump offset. */
HOWTO (R_RISCV_RVC_JUMP, /* type */
0, /* rightshift */
1, /* size */
16, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_RISCV_RVC_JUMP", /* name */
false, /* partial_inplace */
0, /* src_mask */
ENCODE_CJTYPE_IMM (-1U), /* dst_mask */
true), /* pcrel_offset */
/* High 6 bits of 18-bit absolute address. */
HOWTO (R_RISCV_RVC_LUI, /* type */
0, /* rightshift */
1, /* size */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_RISCV_RVC_LUI", /* name */
false, /* partial_inplace */
0, /* src_mask */
ENCODE_CITYPE_IMM (-1U), /* dst_mask */
false), /* pcrel_offset */
/* GP-relative load. */
HOWTO (R_RISCV_GPREL_I, /* type */
0, /* rightshift */
2, /* size */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_RISCV_GPREL_I", /* name */
false, /* partial_inplace */
0, /* src_mask */
ENCODE_ITYPE_IMM (-1U), /* dst_mask */
false), /* pcrel_offset */
/* GP-relative store. */
HOWTO (R_RISCV_GPREL_S, /* type */
0, /* rightshift */
2, /* size */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_RISCV_GPREL_S", /* name */
false, /* partial_inplace */
0, /* src_mask */
ENCODE_STYPE_IMM (-1U), /* dst_mask */
false), /* pcrel_offset */
/* TP-relative TLS LE load. */
HOWTO (R_RISCV_TPREL_I, /* type */
0, /* rightshift */
2, /* size */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_RISCV_TPREL_I", /* name */
false, /* partial_inplace */
0, /* src_mask */
ENCODE_ITYPE_IMM (-1U), /* dst_mask */
false), /* pcrel_offset */
/* TP-relative TLS LE store. */
HOWTO (R_RISCV_TPREL_S, /* type */
0, /* rightshift */
2, /* size */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_RISCV_TPREL_S", /* name */
false, /* partial_inplace */
0, /* src_mask */
ENCODE_STYPE_IMM (-1U), /* dst_mask */
false), /* pcrel_offset */
/* The paired relocation may be relaxed. */
HOWTO (R_RISCV_RELAX, /* type */
0, /* rightshift */
3, /* size */
0, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_RISCV_RELAX", /* name */
false, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
false), /* pcrel_offset */
/* 6-bit in-place addition, for local label subtraction. */
HOWTO (R_RISCV_SUB6, /* type */
0, /* rightshift */
0, /* size */
8, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
riscv_elf_add_sub_reloc, /* special_function */
"R_RISCV_SUB6", /* name */
false, /* partial_inplace */
0, /* src_mask */
0x3f, /* dst_mask */
false), /* pcrel_offset */
/* 6-bit in-place setting, for local label subtraction. */
HOWTO (R_RISCV_SET6, /* type */
0, /* rightshift */
0, /* size */
8, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_RISCV_SET6", /* name */
false, /* partial_inplace */
0, /* src_mask */
0x3f, /* dst_mask */
false), /* pcrel_offset */
/* 8-bit in-place setting, for local label subtraction. */
HOWTO (R_RISCV_SET8, /* type */
0, /* rightshift */
0, /* size */
8, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_RISCV_SET8", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xff, /* dst_mask */
false), /* pcrel_offset */
/* 16-bit in-place setting, for local label subtraction. */
HOWTO (R_RISCV_SET16, /* type */
0, /* rightshift */
1, /* size */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_RISCV_SET16", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
/* 32-bit in-place setting, for local label subtraction. */
HOWTO (R_RISCV_SET32, /* type */
0, /* rightshift */
2, /* size */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_RISCV_SET32", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xffffffff, /* dst_mask */
false), /* pcrel_offset */
/* 32-bit PC relative. */
HOWTO (R_RISCV_32_PCREL, /* type */
0, /* rightshift */
2, /* size */
32, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_RISCV_32_PCREL", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xffffffff, /* dst_mask */
false), /* pcrel_offset */
/* Relocation against a local ifunc symbol in a shared object. */
HOWTO (R_RISCV_IRELATIVE, /* type */
0, /* rightshift */
2, /* size */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_RISCV_IRELATIVE", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xffffffff, /* dst_mask */
false), /* pcrel_offset */
};
/* A mapping from BFD reloc types to RISC-V ELF reloc types. */
struct elf_reloc_map
{
bfd_reloc_code_real_type bfd_val;
enum elf_riscv_reloc_type elf_val;
};
static const struct elf_reloc_map riscv_reloc_map[] =
{
{ BFD_RELOC_NONE, R_RISCV_NONE },
{ BFD_RELOC_32, R_RISCV_32 },
{ BFD_RELOC_64, R_RISCV_64 },
{ BFD_RELOC_RISCV_ADD8, R_RISCV_ADD8 },
{ BFD_RELOC_RISCV_ADD16, R_RISCV_ADD16 },
{ BFD_RELOC_RISCV_ADD32, R_RISCV_ADD32 },
{ BFD_RELOC_RISCV_ADD64, R_RISCV_ADD64 },
{ BFD_RELOC_RISCV_SUB8, R_RISCV_SUB8 },
{ BFD_RELOC_RISCV_SUB16, R_RISCV_SUB16 },
{ BFD_RELOC_RISCV_SUB32, R_RISCV_SUB32 },
{ BFD_RELOC_RISCV_SUB64, R_RISCV_SUB64 },
{ BFD_RELOC_CTOR, R_RISCV_64 },
{ BFD_RELOC_12_PCREL, R_RISCV_BRANCH },
{ BFD_RELOC_RISCV_HI20, R_RISCV_HI20 },
{ BFD_RELOC_RISCV_LO12_I, R_RISCV_LO12_I },
{ BFD_RELOC_RISCV_LO12_S, R_RISCV_LO12_S },
{ BFD_RELOC_RISCV_PCREL_LO12_I, R_RISCV_PCREL_LO12_I },
{ BFD_RELOC_RISCV_PCREL_LO12_S, R_RISCV_PCREL_LO12_S },
{ BFD_RELOC_RISCV_CALL, R_RISCV_CALL },
{ BFD_RELOC_RISCV_CALL_PLT, R_RISCV_CALL_PLT },
{ BFD_RELOC_RISCV_PCREL_HI20, R_RISCV_PCREL_HI20 },
{ BFD_RELOC_RISCV_JMP, R_RISCV_JAL },
{ BFD_RELOC_RISCV_GOT_HI20, R_RISCV_GOT_HI20 },
{ BFD_RELOC_RISCV_TLS_DTPMOD32, R_RISCV_TLS_DTPMOD32 },
{ BFD_RELOC_RISCV_TLS_DTPREL32, R_RISCV_TLS_DTPREL32 },
{ BFD_RELOC_RISCV_TLS_DTPMOD64, R_RISCV_TLS_DTPMOD64 },
{ BFD_RELOC_RISCV_TLS_DTPREL64, R_RISCV_TLS_DTPREL64 },
{ BFD_RELOC_RISCV_TLS_TPREL32, R_RISCV_TLS_TPREL32 },
{ BFD_RELOC_RISCV_TLS_TPREL64, R_RISCV_TLS_TPREL64 },
{ BFD_RELOC_RISCV_TPREL_HI20, R_RISCV_TPREL_HI20 },
{ BFD_RELOC_RISCV_TPREL_ADD, R_RISCV_TPREL_ADD },
{ BFD_RELOC_RISCV_TPREL_LO12_S, R_RISCV_TPREL_LO12_S },
{ BFD_RELOC_RISCV_TPREL_LO12_I, R_RISCV_TPREL_LO12_I },
{ BFD_RELOC_RISCV_TLS_GOT_HI20, R_RISCV_TLS_GOT_HI20 },
{ BFD_RELOC_RISCV_TLS_GD_HI20, R_RISCV_TLS_GD_HI20 },
{ BFD_RELOC_RISCV_ALIGN, R_RISCV_ALIGN },
{ BFD_RELOC_RISCV_RVC_BRANCH, R_RISCV_RVC_BRANCH },
{ BFD_RELOC_RISCV_RVC_JUMP, R_RISCV_RVC_JUMP },
{ BFD_RELOC_RISCV_RVC_LUI, R_RISCV_RVC_LUI },
{ BFD_RELOC_RISCV_GPREL_I, R_RISCV_GPREL_I },
{ BFD_RELOC_RISCV_GPREL_S, R_RISCV_GPREL_S },
{ BFD_RELOC_RISCV_TPREL_I, R_RISCV_TPREL_I },
{ BFD_RELOC_RISCV_TPREL_S, R_RISCV_TPREL_S },
{ BFD_RELOC_RISCV_RELAX, R_RISCV_RELAX },
{ BFD_RELOC_RISCV_SUB6, R_RISCV_SUB6 },
{ BFD_RELOC_RISCV_SET6, R_RISCV_SET6 },
{ BFD_RELOC_RISCV_SET8, R_RISCV_SET8 },
{ BFD_RELOC_RISCV_SET16, R_RISCV_SET16 },
{ BFD_RELOC_RISCV_SET32, R_RISCV_SET32 },
{ BFD_RELOC_RISCV_32_PCREL, R_RISCV_32_PCREL },
};
/* Given a BFD reloc type, return a howto structure. */
reloc_howto_type *
riscv_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
bfd_reloc_code_real_type code)
{
unsigned int i;
for (i = 0; i < ARRAY_SIZE (riscv_reloc_map); i++)
if (riscv_reloc_map[i].bfd_val == code)
return &howto_table[(int) riscv_reloc_map[i].elf_val];
bfd_set_error (bfd_error_bad_value);
return NULL;
}
reloc_howto_type *
riscv_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, const char *r_name)
{
unsigned int i;
for (i = 0; i < ARRAY_SIZE (howto_table); i++)
if (howto_table[i].name && strcasecmp (howto_table[i].name, r_name) == 0)
return &howto_table[i];
return NULL;
}
reloc_howto_type *
riscv_elf_rtype_to_howto (bfd *abfd, unsigned int r_type)
{
if (r_type >= ARRAY_SIZE (howto_table))
{
(*_bfd_error_handler) (_("%pB: unsupported relocation type %#x"),
abfd, r_type);
bfd_set_error (bfd_error_bad_value);
return NULL;
}
return &howto_table[r_type];
}
/* Special_function of RISCV_ADD and RISCV_SUB relocations. */
static bfd_reloc_status_type
riscv_elf_add_sub_reloc (bfd *abfd,
arelent *reloc_entry,
asymbol *symbol,
void *data,
asection *input_section,
bfd *output_bfd,
char **error_message ATTRIBUTE_UNUSED)
{
reloc_howto_type *howto = reloc_entry->howto;
bfd_vma relocation;
if (output_bfd != NULL
&& (symbol->flags & BSF_SECTION_SYM) == 0
&& (!reloc_entry->howto->partial_inplace || reloc_entry->addend == 0))
{
reloc_entry->address += input_section->output_offset;
return bfd_reloc_ok;
}
if (output_bfd != NULL)
return bfd_reloc_continue;
relocation = symbol->value + symbol->section->output_section->vma
+ symbol->section->output_offset + reloc_entry->addend;
bfd_size_type octets = reloc_entry->address
* bfd_octets_per_byte (abfd, input_section);
if (!bfd_reloc_offset_in_range (reloc_entry->howto, abfd,
input_section, octets))
return bfd_reloc_outofrange;
bfd_vma old_value = bfd_get (howto->bitsize, abfd,
data + reloc_entry->address);
switch (howto->type)
{
case R_RISCV_ADD8:
case R_RISCV_ADD16:
case R_RISCV_ADD32:
case R_RISCV_ADD64:
relocation = old_value + relocation;
break;
case R_RISCV_SUB6:
case R_RISCV_SUB8:
case R_RISCV_SUB16:
case R_RISCV_SUB32:
case R_RISCV_SUB64:
relocation = old_value - relocation;
break;
}
bfd_put (howto->bitsize, abfd, relocation, data + reloc_entry->address);
return bfd_reloc_ok;
}
/* Always add the IMPLICIT for the SUBSET. */
static bool
check_implicit_always (const char *implicit ATTRIBUTE_UNUSED,
riscv_subset_t *subset ATTRIBUTE_UNUSED)
{
return true;
}
/* Add the IMPLICIT only when the version of SUBSET less than 2.1. */
static bool
check_implicit_for_i (const char *implicit ATTRIBUTE_UNUSED,
riscv_subset_t *subset)
{
return (subset->major_version < 2
|| (subset->major_version == 2
&& subset->minor_version < 1));
}
/* Record all implicit information for the subsets. */
struct riscv_implicit_subset
{
const char *subset_name;
const char *implicit_name;
/* A function to determine if we need to add the implicit subset. */
bool (*check_func) (const char *, riscv_subset_t *);
};
static struct riscv_implicit_subset riscv_implicit_subsets[] =
{
{"e", "i", check_implicit_always},
{"i", "zicsr", check_implicit_for_i},
{"i", "zifencei", check_implicit_for_i},
{"g", "i", check_implicit_always},
{"g", "m", check_implicit_always},
{"g", "a", check_implicit_always},
{"g", "f", check_implicit_always},
{"g", "d", check_implicit_always},
{"g", "zicsr", check_implicit_always},
{"g", "zifencei", check_implicit_always},
{"q", "d", check_implicit_always},
{"d", "f", check_implicit_always},
{"f", "zicsr", check_implicit_always},
{NULL, NULL, NULL}
};
/* For default_enable field, decide if the extension should
be enbaled by default. */
#define EXT_DEFAULT 0x1
/* List all extensions that binutils should know about. */
struct riscv_supported_ext
{
const char *name;
enum riscv_spec_class isa_spec_class;
int major_version;
int minor_version;
unsigned long default_enable;
};
/* The standard extensions must be added in canonical order. */
static struct riscv_supported_ext riscv_supported_std_ext[] =
{
{"e", ISA_SPEC_CLASS_20191213, 1, 9, 0 },
{"e", ISA_SPEC_CLASS_20190608, 1, 9, 0 },
{"e", ISA_SPEC_CLASS_2P2, 1, 9, 0 },
{"i", ISA_SPEC_CLASS_20191213, 2, 1, 0 },
{"i", ISA_SPEC_CLASS_20190608, 2, 1, 0 },
{"i", ISA_SPEC_CLASS_2P2, 2, 0, 0 },
/* The g is a special case which we don't want to output it,
but still need it when adding implicit extensions. */
{"g", ISA_SPEC_CLASS_NONE, RISCV_UNKNOWN_VERSION, RISCV_UNKNOWN_VERSION, EXT_DEFAULT },
{"m", ISA_SPEC_CLASS_20191213, 2, 0, 0 },
{"m", ISA_SPEC_CLASS_20190608, 2, 0, 0 },
{"m", ISA_SPEC_CLASS_2P2, 2, 0, 0 },
{"a", ISA_SPEC_CLASS_20191213, 2, 1, 0 },
{"a", ISA_SPEC_CLASS_20190608, 2, 0, 0 },
{"a", ISA_SPEC_CLASS_2P2, 2, 0, 0 },
{"f", ISA_SPEC_CLASS_20191213, 2, 2, 0 },
{"f", ISA_SPEC_CLASS_20190608, 2, 2, 0 },
{"f", ISA_SPEC_CLASS_2P2, 2, 0, 0 },
{"d", ISA_SPEC_CLASS_20191213, 2, 2, 0 },
{"d", ISA_SPEC_CLASS_20190608, 2, 2, 0 },
{"d", ISA_SPEC_CLASS_2P2, 2, 0, 0 },
{"q", ISA_SPEC_CLASS_20191213, 2, 2, 0 },
{"q", ISA_SPEC_CLASS_20190608, 2, 2, 0 },
{"q", ISA_SPEC_CLASS_2P2, 2, 0, 0 },
{"l", ISA_SPEC_CLASS_NONE, RISCV_UNKNOWN_VERSION, RISCV_UNKNOWN_VERSION, 0 },
{"c", ISA_SPEC_CLASS_20191213, 2, 0, 0 },
{"c", ISA_SPEC_CLASS_20190608, 2, 0, 0 },
{"c", ISA_SPEC_CLASS_2P2, 2, 0, 0 },
{"b", ISA_SPEC_CLASS_NONE, RISCV_UNKNOWN_VERSION, RISCV_UNKNOWN_VERSION, 0 },
{"j", ISA_SPEC_CLASS_NONE, RISCV_UNKNOWN_VERSION, RISCV_UNKNOWN_VERSION, 0 },
{"t", ISA_SPEC_CLASS_NONE, RISCV_UNKNOWN_VERSION, RISCV_UNKNOWN_VERSION, 0 },
{"p", ISA_SPEC_CLASS_NONE, RISCV_UNKNOWN_VERSION, RISCV_UNKNOWN_VERSION, 0 },
{"v", ISA_SPEC_CLASS_NONE, RISCV_UNKNOWN_VERSION, RISCV_UNKNOWN_VERSION, 0 },
{"n", ISA_SPEC_CLASS_NONE, RISCV_UNKNOWN_VERSION, RISCV_UNKNOWN_VERSION, 0 },
{NULL, 0, 0, 0, 0}
};
static struct riscv_supported_ext riscv_supported_std_z_ext[] =
{
{"zicsr", ISA_SPEC_CLASS_20191213, 2, 0, 0 },
{"zicsr", ISA_SPEC_CLASS_20190608, 2, 0, 0 },
{"zifencei", ISA_SPEC_CLASS_20191213, 2, 0, 0 },
{"zifencei", ISA_SPEC_CLASS_20190608, 2, 0, 0 },
{"zihintpause", ISA_SPEC_CLASS_DRAFT, 1, 0, 0 },
{"zbb", ISA_SPEC_CLASS_DRAFT, 0, 93, 0 },
{"zba", ISA_SPEC_CLASS_DRAFT, 0, 93, 0 },
{"zbc", ISA_SPEC_CLASS_DRAFT, 0, 93, 0 },
{NULL, 0, 0, 0, 0}
};
static struct riscv_supported_ext riscv_supported_std_s_ext[] =
{
{NULL, 0, 0, 0, 0}
};
static struct riscv_supported_ext riscv_supported_std_h_ext[] =
{
{NULL, 0, 0, 0, 0}
};
static struct riscv_supported_ext riscv_supported_std_zxm_ext[] =
{
{NULL, 0, 0, 0, 0}
};
const struct riscv_supported_ext *riscv_all_supported_ext[] =
{
riscv_supported_std_ext,
riscv_supported_std_z_ext,
riscv_supported_std_s_ext,
riscv_supported_std_h_ext,
riscv_supported_std_zxm_ext,
NULL
};
/* ISA extension prefixed name class. Must define them in parsing order. */
enum riscv_prefix_ext_class
{
RV_ISA_CLASS_Z = 1,
RV_ISA_CLASS_S,
RV_ISA_CLASS_H,
RV_ISA_CLASS_ZXM,
RV_ISA_CLASS_X,
RV_ISA_CLASS_UNKNOWN
};
/* Record the strings of the prefixed extensions, and their corresponding
classes. The more letters of the prefix string, the more forward it must
be defined. Otherwise, the riscv_get_prefix_class will map it to the
wrong classes. */
struct riscv_parse_prefix_config
{
/* Class of the extension. */
enum riscv_prefix_ext_class class;
/* Prefix string for error printing and internal parser usage. */
const char *prefix;
};
static const struct riscv_parse_prefix_config parse_config[] =
{
{RV_ISA_CLASS_ZXM, "zxm"},
{RV_ISA_CLASS_Z, "z"},
{RV_ISA_CLASS_S, "s"},
{RV_ISA_CLASS_H, "h"},
{RV_ISA_CLASS_X, "x"},
{RV_ISA_CLASS_UNKNOWN, NULL}
};
/* Get the prefixed name class for the extensions, the class also
means the order of the prefixed extensions. */
static enum riscv_prefix_ext_class
riscv_get_prefix_class (const char *arch)
{
int i = 0;
while (parse_config[i].class != RV_ISA_CLASS_UNKNOWN)
{
if (strncmp (arch, parse_config[i].prefix,
strlen (parse_config[i].prefix)) == 0)
return parse_config[i].class;
i++;
}
return RV_ISA_CLASS_UNKNOWN;
}
/* Check KNOWN_EXTS to see if the EXT is supported. */
static bool
riscv_known_prefixed_ext (const char *ext,
struct riscv_supported_ext *known_exts)
{
size_t i;
for (i = 0; known_exts[i].name != NULL; ++i)
if (strcmp (ext, known_exts[i].name) == 0)
return true;
return false;
}
/* Check whether the prefixed extension is valid or not. Return
true if valid, otehrwise return false. */
static bool
riscv_valid_prefixed_ext (const char *ext)
{
enum riscv_prefix_ext_class class = riscv_get_prefix_class (ext);
switch (class)
{
case RV_ISA_CLASS_Z:
return riscv_known_prefixed_ext (ext, riscv_supported_std_z_ext);
case RV_ISA_CLASS_ZXM:
return riscv_known_prefixed_ext (ext, riscv_supported_std_zxm_ext);
case RV_ISA_CLASS_S:
return riscv_known_prefixed_ext (ext, riscv_supported_std_s_ext);
case RV_ISA_CLASS_H:
return riscv_known_prefixed_ext (ext, riscv_supported_std_h_ext);
case RV_ISA_CLASS_X:
/* Only the single x is invalid. */
if (strcmp (ext, "x") != 0)
return true;
default:
break;
}
return false;
}
/* Array is used to compare the orders of standard extensions quickly. */
static int riscv_ext_order[26] = {0};
/* Init the riscv_ext_order array. */
static void
riscv_init_ext_order (void)
{
static bool inited = false;
if (inited)
return;
/* The orders of all standard extensions are positive. */
int order = 1;
int i = 0;
while (riscv_supported_std_ext[i].name != NULL)
{
const char *ext = riscv_supported_std_ext[i].name;
riscv_ext_order[(*ext - 'a')] = order++;
i++;
while (riscv_supported_std_ext[i].name
&& strcmp (ext, riscv_supported_std_ext[i].name) == 0)
i++;
}
/* Some of the prefixed keyword are not single letter, so we set
their prefixed orders in the riscv_compare_subsets directly,
not through the riscv_ext_order. */
inited = true;
}
/* Similar to the strcmp. It returns an integer less than, equal to,
or greater than zero if `subset2` is found, respectively, to be less
than, to match, or be greater than `subset1`.
The order values,
Zero: Preserved keywords.
Positive number: Standard extensions.
Negative number: Prefixed keywords. */
int
riscv_compare_subsets (const char *subset1, const char *subset2)
{
int order1 = riscv_ext_order[(*subset1 - 'a')];
int order2 = riscv_ext_order[(*subset2 - 'a')];
/* Compare the standard extension first. */
if (order1 > 0 && order2 > 0)
return order1 - order2;
/* Set the prefixed orders to negative numbers. */
enum riscv_prefix_ext_class class1 = riscv_get_prefix_class (subset1);
enum riscv_prefix_ext_class class2 = riscv_get_prefix_class (subset2);
if (class1 != RV_ISA_CLASS_UNKNOWN)
order1 = - (int) class1;
if (class2 != RV_ISA_CLASS_UNKNOWN)
order2 = - (int) class2;
if (order1 == order2)
{
/* Compare the standard addition z extensions. */
if (class1 == RV_ISA_CLASS_Z)
{
order1 = riscv_ext_order[(*++subset1 - 'a')];
order2 = riscv_ext_order[(*++subset2 - 'a')];
if (order1 != order2)
return order1 - order2;
}
return strcasecmp (++subset1, ++subset2);
}
return order2 - order1;
}
/* Find subset in the list. Return TRUE and set `current` to the subset
if it is found. Otherwise, return FALSE and set `current` to the place
where we should insert the subset. However, return FALSE with the NULL
`current` means we should insert the subset at the head of subset list,
if needed. */
bool
riscv_lookup_subset (const riscv_subset_list_t *subset_list,
const char *subset,
riscv_subset_t **current)
{
riscv_subset_t *s, *pre_s = NULL;
/* If the subset is added in order, then just add it at the tail. */
if (subset_list->tail != NULL
&& riscv_compare_subsets (subset_list->tail->name, subset) < 0)
{
*current = subset_list->tail;
return false;
}
for (s = subset_list->head;
s != NULL;
pre_s = s, s = s->next)
{
int cmp = riscv_compare_subsets (s->name, subset);
if (cmp == 0)
{
*current = s;
return true;
}
else if (cmp > 0)
break;
}
*current = pre_s;
return false;
}
/* Add the extension to the subset list. Search the
list first, and then find the right place to add. */
void
riscv_add_subset (riscv_subset_list_t *subset_list,
const char *subset,
int major,
int minor)
{
riscv_subset_t *current, *new;
if (riscv_lookup_subset (subset_list, subset, &current))
return;
new = xmalloc (sizeof *new);
new->name = xstrdup (subset);
new->major_version = major;
new->minor_version = minor;
new->next = NULL;
if (current != NULL)
{
new->next = current->next;
current->next = new;
}
else
{
new->next = subset_list->head;
subset_list->head = new;
}
if (new->next == NULL)
subset_list->tail = new;
}
/* Get the default versions from the riscv_supported_*ext tables. */
static void
riscv_get_default_ext_version (enum riscv_spec_class default_isa_spec,
const char *name,
int *major_version,
int *minor_version)
{
if (name == NULL || default_isa_spec == ISA_SPEC_CLASS_NONE)
return;
struct riscv_supported_ext *table = NULL;
enum riscv_prefix_ext_class class = riscv_get_prefix_class (name);
switch (class)
{
case RV_ISA_CLASS_ZXM: table = riscv_supported_std_zxm_ext; break;
case RV_ISA_CLASS_Z: table = riscv_supported_std_z_ext; break;
case RV_ISA_CLASS_S: table = riscv_supported_std_s_ext; break;
case RV_ISA_CLASS_H: table = riscv_supported_std_h_ext; break;
case RV_ISA_CLASS_X:
break;
default:
table = riscv_supported_std_ext;
}
int i = 0;
while (table != NULL && table[i].name != NULL)
{
if (strcmp (table[i].name, name) == 0
&& (table[i].isa_spec_class == ISA_SPEC_CLASS_DRAFT
|| table[i].isa_spec_class == default_isa_spec))
{
*major_version = table[i].major_version;
*minor_version = table[i].minor_version;
return;
}
i++;
}
}
/* Find the default versions for the extension before adding them to
the subset list, if their versions are RISCV_UNKNOWN_VERSION.
Afterwards, report errors if we can not find their default versions. */
static void
riscv_parse_add_subset (riscv_parse_subset_t *rps,
const char *subset,
int major,
int minor,
bool implicit)
{
int major_version = major;
int minor_version = minor;
if (major_version == RISCV_UNKNOWN_VERSION
|| minor_version == RISCV_UNKNOWN_VERSION)
riscv_get_default_ext_version (rps->isa_spec, subset,
&major_version, &minor_version);
/* We don't care the versions of the implicit extensions. */
if (!implicit
&& (major_version == RISCV_UNKNOWN_VERSION
|| minor_version == RISCV_UNKNOWN_VERSION))
{
if (subset[0] == 'x')
rps->error_handler
(_("x ISA extension `%s' must be set with the versions"),
subset);
else
rps->error_handler
(_("cannot find default versions of the ISA extension `%s'"),
subset);
return;
}
riscv_add_subset (rps->subset_list, subset,
major_version, minor_version);
}
/* Release subset list. */
void
riscv_release_subset_list (riscv_subset_list_t *subset_list)
{
while (subset_list->head != NULL)
{
riscv_subset_t *next = subset_list->head->next;
free ((void *)subset_list->head->name);
free (subset_list->head);
subset_list->head = next;
}
subset_list->tail = NULL;
}
/* Parsing extension version.
Return Value:
Points to the end of version
Arguments:
`rps`: Hooks and status for parsing extensions.
`arch`: Full ISA string.
`p`: Curent parsing position.
`major_version`: Parsed major version.
`minor_version`: Parsed minor version.
`std_ext_p`: True if parsing standard extension. */
static const char *
riscv_parsing_subset_version (riscv_parse_subset_t *rps,
const char *arch,
const char *p,
int *major_version,
int *minor_version,
bool std_ext_p)
{
bool major_p = true;
int version = 0;
char np;
*major_version = 0;
*minor_version = 0;
for (; *p; ++p)
{
if (*p == 'p')
{
np = *(p + 1);
if (!ISDIGIT (np))
{
/* Might be beginning of `p` extension. */
if (std_ext_p)
{
*major_version = version;
*minor_version = 0;
return p;
}
else
{
rps->error_handler
(_("%s: expect number after `%dp'"),
arch, version);
return NULL;
}
}
*major_version = version;
major_p = false;
version = 0;
}
else if (ISDIGIT (*p))
version = (version * 10) + (*p - '0');
else
break;
}
if (major_p)
*major_version = version;
else
*minor_version = version;
/* We can not find any version in string. */
if (*major_version == 0 && *minor_version == 0)
{
*major_version = RISCV_UNKNOWN_VERSION;
*minor_version = RISCV_UNKNOWN_VERSION;
}
return p;
}
/* Parsing function for standard extensions.
Return Value:
Points to the end of extensions.
Arguments:
`rps`: Hooks and status for parsing extensions.
`arch`: Full ISA string.
`p`: Curent parsing position. */
static const char *
riscv_parse_std_ext (riscv_parse_subset_t *rps,
const char *arch,
const char *p)
{
/* First letter must start with i, e or g. */
if (*p != 'e' && *p != 'i' && *p != 'g')
{
rps->error_handler
(_("%s: first ISA extension must be `e', `i' or `g'"),
arch);
return NULL;
}
while (p != NULL && *p != '\0')
{
/* Stop when we parsed the known prefix class. */
enum riscv_prefix_ext_class class = riscv_get_prefix_class (p);
if (class != RV_ISA_CLASS_UNKNOWN)
break;
if (*p == '_')
{
p++;
continue;
}
bool implicit = false;
int major = RISCV_UNKNOWN_VERSION;
int minor = RISCV_UNKNOWN_VERSION;
char subset[2] = {0, 0};
subset[0] = *p;
/* Check if the standard extension is supported. */
if (riscv_ext_order[(subset[0] - 'a')] == 0)
{
rps->error_handler
(_("%s: unknown standard ISA extension `%c'"),
arch, subset[0]);
return NULL;
}
/* Checking canonical order. */
if (rps->subset_list->tail != NULL
&& riscv_compare_subsets (rps->subset_list->tail->name, subset) > 0)
{
rps->error_handler
(_("%s: standard ISA extension `%c' is not "
"in canonical order"), arch, subset[0]);
return NULL;
}
p = riscv_parsing_subset_version (rps, arch, ++p, &major, &minor, true);
/* Added g as an implicit extension. */
if (subset[0] == 'g')
{
implicit = true;
major = RISCV_UNKNOWN_VERSION;
minor = RISCV_UNKNOWN_VERSION;
}
riscv_parse_add_subset (rps, subset, major, minor, implicit);
}
return p;
}
/* Parsing function for prefixed extensions.
Return Value:
Points to the end of extension.
Arguments:
`rps`: Hooks and status for parsing extensions.
`arch`: Full ISA string.
`p`: Curent parsing position. */
static const char *
riscv_parse_prefixed_ext (riscv_parse_subset_t *rps,
const char *arch,
const char *p)
{
int major_version;
int minor_version;
const char *last_name;
enum riscv_prefix_ext_class class;
while (*p)
{
if (*p == '_')
{
p++;
continue;
}
class = riscv_get_prefix_class (p);
if (class == RV_ISA_CLASS_UNKNOWN)
{
rps->error_handler
(_("%s: unknown prefix class for the ISA extension `%s'"),
arch, p);
return NULL;
}
char *subset = xstrdup (p);
char *q = subset;
const char *end_of_version;
while (*++q != '\0' && *q != '_' && !ISDIGIT (*q))
;
end_of_version =
riscv_parsing_subset_version (rps, arch, q,
&major_version,
&minor_version, false);
*q = '\0';
if (end_of_version == NULL)
{
free (subset);
return NULL;
}
/* Check if the prefix extension is known.
For 'x', anything goes but it cannot simply be 'x'.
For other prefixed extensions, it must be known from a list
and cannot simply be the prefixed name. */
/* Check that the extension name is well-formed. */
if (rps->check_unknown_prefixed_ext
&& !riscv_valid_prefixed_ext (subset))
{
rps->error_handler
(_("%s: unknown prefixed ISA extension `%s'"),
arch, subset);
free (subset);
return NULL;
}
/* Check that the extension isn't duplicate. */
last_name = rps->subset_list->tail->name;
if (!strcasecmp (last_name, subset))
{
rps->error_handler
(_("%s: duplicate prefixed ISA extension `%s'"),
arch, subset);
free (subset);
return NULL;
}
/* Check that the extension is in expected order. */
if (riscv_compare_subsets (last_name, subset) > 0)
{
rps->error_handler
(_("%s: prefixed ISA extension `%s' is not in expected "
"order. It must come before `%s'"),
arch, subset, last_name);
free (subset);
return NULL;
}
riscv_parse_add_subset (rps, subset,
major_version,
minor_version, false);
p += end_of_version - subset;
free (subset);
if (*p != '\0' && *p != '_')
{
rps->error_handler
(_("%s: prefixed ISA extension must separate with _"),
arch);
return NULL;
}
}
return p;
}
/* Add the implicit extensions. */
static void
riscv_parse_add_implicit_subsets (riscv_parse_subset_t *rps)
{
struct riscv_implicit_subset *t = riscv_implicit_subsets;
for (; t->subset_name; t++)
{
riscv_subset_t *subset = NULL;
if (riscv_lookup_subset (rps->subset_list, t->subset_name, &subset)
&& t->check_func (t->implicit_name, subset))
riscv_parse_add_subset (rps, t->implicit_name,
RISCV_UNKNOWN_VERSION,
RISCV_UNKNOWN_VERSION, true);
}
}
/* Check extensions conflicts. */
static bool
riscv_parse_check_conflicts (riscv_parse_subset_t *rps)
{
riscv_subset_t *subset = NULL;
int xlen = *rps->xlen;
bool no_conflict = true;
if (riscv_lookup_subset (rps->subset_list, "e", &subset)
&& xlen > 32)
{
rps->error_handler
(_("rv%d does not support the `e' extension"), xlen);
no_conflict = false;
}
if (riscv_lookup_subset (rps->subset_list, "q", &subset)
&& xlen < 64)
{
rps->error_handler
(_("rv%d does not support the `q' extension"), xlen);
no_conflict = false;
}
if (riscv_lookup_subset (rps->subset_list, "e", &subset)
&& riscv_lookup_subset (rps->subset_list, "f", &subset))
{
rps->error_handler
(_("rv32e does not support the `f' extension"));
no_conflict = false;
}
return no_conflict;
}
/* Set the default subset list according to the default_enable field
of riscv_supported_*ext tables. */
static void
riscv_set_default_arch (riscv_parse_subset_t *rps)
{
unsigned long enable = EXT_DEFAULT;
int i, j;
for (i = 0; riscv_all_supported_ext[i] != NULL; i++)
{
const struct riscv_supported_ext *table = riscv_all_supported_ext[i];
for (j = 0; table[j].name != NULL; j++)
{
bool implicit = false;
if (strcmp (table[j].name, "g") == 0)
implicit = true;
if (table[j].default_enable & enable)
riscv_parse_add_subset (rps, table[j].name,
RISCV_UNKNOWN_VERSION,
RISCV_UNKNOWN_VERSION, implicit);
}
}
}
/* Function for parsing ISA string.
Return Value:
Return TRUE on success.
Arguments:
`rps`: Hooks and status for parsing extensions.
`arch`: Full ISA string. */
bool
riscv_parse_subset (riscv_parse_subset_t *rps,
const char *arch)
{
const char *p;
/* Init the riscv_ext_order array to compare the order of extensions
quickly. */
riscv_init_ext_order ();
if (arch == NULL)
{
riscv_set_default_arch (rps);
riscv_parse_add_implicit_subsets (rps);
return riscv_parse_check_conflicts (rps);
}
for (p = arch; *p != '\0'; p++)
{
if (ISUPPER (*p))
{
rps->error_handler
(_("%s: ISA string cannot contain uppercase letters"),
arch);
return false;
}
}
p = arch;
if (startswith (p, "rv32"))
{
*rps->xlen = 32;
p += 4;
}
else if (startswith (p, "rv64"))
{
*rps->xlen = 64;
p += 4;
}
else
{
/* ISA string shouldn't be NULL or empty here. For linker,
it might be empty when we failed to merge the ISA string
in the riscv_merge_attributes. For assembler, we might
give an empty string by .attribute arch, "" or -march=.
However, We have already issued the correct error message
in another side, so do not issue this error when the ISA
string is empty. */
if (strlen (arch))
rps->error_handler (
_("%s: ISA string must begin with rv32 or rv64"),
arch);
return false;
}
/* Parsing standard extension. */
p = riscv_parse_std_ext (rps, arch, p);
if (p == NULL)
return false;
/* Parse the different classes of extensions in the specified order. */
while (*p != '\0')
{
p = riscv_parse_prefixed_ext (rps, arch, p);
if (p == NULL)
return false;
}
/* Finally add implicit extensions according to the current
extensions. */
riscv_parse_add_implicit_subsets (rps);
/* Check the conflicts. */
return riscv_parse_check_conflicts (rps);
}
/* Return the number of digits for the input. */
size_t
riscv_estimate_digit (unsigned num)
{
size_t digit = 0;
if (num == 0)
return 1;
for (digit = 0; num ; num /= 10)
digit++;
return digit;
}
/* Auxiliary function to estimate string length of subset list. */
static size_t
riscv_estimate_arch_strlen1 (const riscv_subset_t *subset)
{
if (subset == NULL)
return 6; /* For rv32/rv64/rv128 and string terminator. */
return riscv_estimate_arch_strlen1 (subset->next)
+ strlen (subset->name)
+ riscv_estimate_digit (subset->major_version)
+ 1 /* For version seperator 'p'. */
+ riscv_estimate_digit (subset->minor_version)
+ 1 /* For underscore. */;
}
/* Estimate the string length of this subset list. */
static size_t
riscv_estimate_arch_strlen (const riscv_subset_list_t *subset_list)
{
return riscv_estimate_arch_strlen1 (subset_list->head);
}
/* Auxiliary function to convert subset info to string. */
static void
riscv_arch_str1 (riscv_subset_t *subset,
char *attr_str, char *buf, size_t bufsz)
{
const char *underline = "_";
riscv_subset_t *subset_t = subset;
if (subset_t == NULL)
return;
/* No underline between rvXX and i/e. */
if ((strcasecmp (subset_t->name, "i") == 0)
|| (strcasecmp (subset_t->name, "e") == 0))
underline = "";
snprintf (buf, bufsz, "%s%s%dp%d",
underline,
subset_t->name,
subset_t->major_version,
subset_t->minor_version);
strncat (attr_str, buf, bufsz);
/* Skip 'i' extension after 'e', or skip extensions which
versions are unknown. */
while (subset_t->next
&& ((strcmp (subset_t->name, "e") == 0
&& strcmp (subset_t->next->name, "i") == 0)
|| subset_t->next->major_version == RISCV_UNKNOWN_VERSION
|| subset_t->next->minor_version == RISCV_UNKNOWN_VERSION))
subset_t = subset_t->next;
riscv_arch_str1 (subset_t->next, attr_str, buf, bufsz);
}
/* Convert subset information into string with explicit versions. */
char *
riscv_arch_str (unsigned xlen, const riscv_subset_list_t *subset)
{
size_t arch_str_len = riscv_estimate_arch_strlen (subset);
char *attr_str = xmalloc (arch_str_len);
char *buf = xmalloc (arch_str_len);
snprintf (attr_str, arch_str_len, "rv%u", xlen);
riscv_arch_str1 (subset->head, attr_str, buf, arch_str_len);
free (buf);
return attr_str;
}