diff options
Diffstat (limited to 'bfd/elfnn-riscv.c')
| -rw-r--r-- | bfd/elfnn-riscv.c | 3160 |
1 files changed, 3160 insertions, 0 deletions
diff --git a/bfd/elfnn-riscv.c b/bfd/elfnn-riscv.c new file mode 100644 index 00000000000..be1de226701 --- /dev/null +++ b/bfd/elfnn-riscv.c @@ -0,0 +1,3160 @@ +/* RISC-V-specific support for NN-bit ELF. + Copyright 2011-2016 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/>. */ + +/* This file handles RISC-V ELF targets. */ + +#include "sysdep.h" +#include "bfd.h" +#include "libbfd.h" +#include "bfdlink.h" +#include "genlink.h" +#include "elf-bfd.h" +#include "elfxx-riscv.h" +#include "elf/riscv.h" +#include "opcode/riscv.h" + +#define ARCH_SIZE NN + +#define MINUS_ONE ((bfd_vma)0 - 1) + +#define RISCV_ELF_LOG_WORD_BYTES (ARCH_SIZE == 32 ? 2 : 3) + +#define RISCV_ELF_WORD_BYTES (1 << RISCV_ELF_LOG_WORD_BYTES) + +/* The name of the dynamic interpreter. This is put in the .interp + section. */ + +#define ELF64_DYNAMIC_INTERPRETER "/lib/ld.so.1" +#define ELF32_DYNAMIC_INTERPRETER "/lib32/ld.so.1" + +#define ELF_ARCH bfd_arch_riscv +#define ELF_TARGET_ID RISCV_ELF_DATA +#define ELF_MACHINE_CODE EM_RISCV +#define ELF_MAXPAGESIZE 0x1000 +#define ELF_COMMONPAGESIZE 0x1000 + +/* The RISC-V linker needs to keep track of the number of relocs that it + decides to copy as dynamic relocs in check_relocs for each symbol. + This is so that it can later discard them if they are found to be + unnecessary. We store the information in a field extending the + regular ELF linker hash table. */ + +struct riscv_elf_dyn_relocs +{ + struct riscv_elf_dyn_relocs *next; + + /* The input section of the reloc. */ + asection *sec; + + /* Total number of relocs copied for the input section. */ + bfd_size_type count; + + /* Number of pc-relative relocs copied for the input section. */ + bfd_size_type pc_count; +}; + +/* RISC-V ELF linker hash entry. */ + +struct riscv_elf_link_hash_entry +{ + struct elf_link_hash_entry elf; + + /* Track dynamic relocs copied for this symbol. */ + struct riscv_elf_dyn_relocs *dyn_relocs; + +#define GOT_UNKNOWN 0 +#define GOT_NORMAL 1 +#define GOT_TLS_GD 2 +#define GOT_TLS_IE 4 +#define GOT_TLS_LE 8 + char tls_type; +}; + +#define riscv_elf_hash_entry(ent) \ + ((struct riscv_elf_link_hash_entry *)(ent)) + +struct _bfd_riscv_elf_obj_tdata +{ + struct elf_obj_tdata root; + + /* tls_type for each local got entry. */ + char *local_got_tls_type; +}; + +#define _bfd_riscv_elf_tdata(abfd) \ + ((struct _bfd_riscv_elf_obj_tdata *) (abfd)->tdata.any) + +#define _bfd_riscv_elf_local_got_tls_type(abfd) \ + (_bfd_riscv_elf_tdata (abfd)->local_got_tls_type) + +#define _bfd_riscv_elf_tls_type(abfd, h, symndx) \ + (*((h) != NULL ? &riscv_elf_hash_entry (h)->tls_type \ + : &_bfd_riscv_elf_local_got_tls_type (abfd) [symndx])) + +#define is_riscv_elf(bfd) \ + (bfd_get_flavour (bfd) == bfd_target_elf_flavour \ + && elf_tdata (bfd) != NULL \ + && elf_object_id (bfd) == RISCV_ELF_DATA) + +#include "elf/common.h" +#include "elf/internal.h" + +struct riscv_elf_link_hash_table +{ + struct elf_link_hash_table elf; + + /* Short-cuts to get to dynamic linker sections. */ + asection *sdynbss; + asection *srelbss; + asection *sdyntdata; + + /* Small local sym to section mapping cache. */ + struct sym_cache sym_cache; +}; + + +/* Get the RISC-V ELF linker hash table from a link_info structure. */ +#define riscv_elf_hash_table(p) \ + (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \ + == RISCV_ELF_DATA ? ((struct riscv_elf_link_hash_table *) ((p)->hash)) : NULL) + +static void +riscv_info_to_howto_rela (bfd *abfd ATTRIBUTE_UNUSED, + arelent *cache_ptr, + Elf_Internal_Rela *dst) +{ + cache_ptr->howto = riscv_elf_rtype_to_howto (ELFNN_R_TYPE (dst->r_info)); +} + +static void +riscv_elf_append_rela (bfd *abfd, asection *s, Elf_Internal_Rela *rel) +{ + const struct elf_backend_data *bed; + bfd_byte *loc; + + bed = get_elf_backend_data (abfd); + loc = s->contents + (s->reloc_count++ * bed->s->sizeof_rela); + bed->s->swap_reloca_out (abfd, rel, loc); +} + +/* PLT/GOT stuff. */ + +#define PLT_HEADER_INSNS 8 +#define PLT_ENTRY_INSNS 4 +#define PLT_HEADER_SIZE (PLT_HEADER_INSNS * 4) +#define PLT_ENTRY_SIZE (PLT_ENTRY_INSNS * 4) + +#define GOT_ENTRY_SIZE RISCV_ELF_WORD_BYTES + +#define GOTPLT_HEADER_SIZE (2 * GOT_ENTRY_SIZE) + +#define sec_addr(sec) ((sec)->output_section->vma + (sec)->output_offset) + +static bfd_vma +riscv_elf_got_plt_val (bfd_vma plt_index, struct bfd_link_info *info) +{ + return sec_addr (riscv_elf_hash_table (info)->elf.sgotplt) + + GOTPLT_HEADER_SIZE + (plt_index * GOT_ENTRY_SIZE); +} + +#if ARCH_SIZE == 32 +# define MATCH_LREG MATCH_LW +#else +# define MATCH_LREG MATCH_LD +#endif + +/* Generate a PLT header. */ + +static void +riscv_make_plt_header (bfd_vma gotplt_addr, bfd_vma addr, uint32_t *entry) +{ + bfd_vma gotplt_offset_high = RISCV_PCREL_HIGH_PART (gotplt_addr, addr); + bfd_vma gotplt_offset_low = RISCV_PCREL_LOW_PART (gotplt_addr, addr); + + /* auipc t2, %hi(.got.plt) + sub t1, t1, t3 # shifted .got.plt offset + hdr size + 12 + l[w|d] t3, %lo(.got.plt)(t2) # _dl_runtime_resolve + addi t1, t1, -(hdr size + 12) # shifted .got.plt offset + addi t0, t2, %lo(.got.plt) # &.got.plt + srli t1, t1, log2(16/PTRSIZE) # .got.plt offset + l[w|d] t0, PTRSIZE(t0) # link map + jr t3 */ + + entry[0] = RISCV_UTYPE (AUIPC, X_T2, gotplt_offset_high); + entry[1] = RISCV_RTYPE (SUB, X_T1, X_T1, X_T3); + entry[2] = RISCV_ITYPE (LREG, X_T3, X_T2, gotplt_offset_low); + entry[3] = RISCV_ITYPE (ADDI, X_T1, X_T1, -(PLT_HEADER_SIZE + 12)); + entry[4] = RISCV_ITYPE (ADDI, X_T0, X_T2, gotplt_offset_low); + entry[5] = RISCV_ITYPE (SRLI, X_T1, X_T1, 4 - RISCV_ELF_LOG_WORD_BYTES); + entry[6] = RISCV_ITYPE (LREG, X_T0, X_T0, RISCV_ELF_WORD_BYTES); + entry[7] = RISCV_ITYPE (JALR, 0, X_T3, 0); +} + +/* Generate a PLT entry. */ + +static void +riscv_make_plt_entry (bfd_vma got, bfd_vma addr, uint32_t *entry) +{ + /* auipc t3, %hi(.got.plt entry) + l[w|d] t3, %lo(.got.plt entry)(t3) + jalr t1, t3 + nop */ + + entry[0] = RISCV_UTYPE (AUIPC, X_T3, RISCV_PCREL_HIGH_PART (got, addr)); + entry[1] = RISCV_ITYPE (LREG, X_T3, X_T3, RISCV_PCREL_LOW_PART(got, addr)); + entry[2] = RISCV_ITYPE (JALR, X_T1, X_T3, 0); + entry[3] = RISCV_NOP; +} + +/* Create an entry in an RISC-V ELF linker hash table. */ + +static struct bfd_hash_entry * +link_hash_newfunc (struct bfd_hash_entry *entry, + struct bfd_hash_table *table, const char *string) +{ + /* Allocate the structure if it has not already been allocated by a + subclass. */ + if (entry == NULL) + { + entry = + bfd_hash_allocate (table, + sizeof (struct riscv_elf_link_hash_entry)); + if (entry == NULL) + return entry; + } + + /* Call the allocation method of the superclass. */ + entry = _bfd_elf_link_hash_newfunc (entry, table, string); + if (entry != NULL) + { + struct riscv_elf_link_hash_entry *eh; + + eh = (struct riscv_elf_link_hash_entry *) entry; + eh->dyn_relocs = NULL; + eh->tls_type = GOT_UNKNOWN; + } + + return entry; +} + +/* Create a RISC-V ELF linker hash table. */ + +static struct bfd_link_hash_table * +riscv_elf_link_hash_table_create (bfd *abfd) +{ + struct riscv_elf_link_hash_table *ret; + bfd_size_type amt = sizeof (struct riscv_elf_link_hash_table); + + ret = (struct riscv_elf_link_hash_table *) bfd_zmalloc (amt); + if (ret == NULL) + return NULL; + + if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc, + sizeof (struct riscv_elf_link_hash_entry), + RISCV_ELF_DATA)) + { + free (ret); + return NULL; + } + + return &ret->elf.root; +} + +/* Create the .got section. */ + +static bfd_boolean +riscv_elf_create_got_section (bfd *abfd, struct bfd_link_info *info) +{ + flagword flags; + asection *s, *s_got; + struct elf_link_hash_entry *h; + const struct elf_backend_data *bed = get_elf_backend_data (abfd); + struct elf_link_hash_table *htab = elf_hash_table (info); + + /* This function may be called more than once. */ + s = bfd_get_linker_section (abfd, ".got"); + if (s != NULL) + return TRUE; + + flags = bed->dynamic_sec_flags; + + s = bfd_make_section_anyway_with_flags (abfd, + (bed->rela_plts_and_copies_p + ? ".rela.got" : ".rel.got"), + (bed->dynamic_sec_flags + | SEC_READONLY)); + if (s == NULL + || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align)) + return FALSE; + htab->srelgot = s; + + s = s_got = bfd_make_section_anyway_with_flags (abfd, ".got", flags); + if (s == NULL + || !bfd_set_section_alignment (abfd, s, bed->s->log_file_align)) + return FALSE; + htab->sgot = s; + + /* The first bit of the global offset table is the header. */ + s->size += bed->got_header_size; + + if (bed->want_got_plt) + { + s = bfd_make_section_anyway_with_flags (abfd, ".got.plt", flags); + if (s == NULL + || !bfd_set_section_alignment (abfd, s, + bed->s->log_file_align)) + return FALSE; + htab->sgotplt = s; + + /* Reserve room for the header. */ + s->size += GOTPLT_HEADER_SIZE; + } + + if (bed->want_got_sym) + { + /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got + section. We don't do this in the linker script because we don't want + to define the symbol if we are not creating a global offset + table. */ + h = _bfd_elf_define_linkage_sym (abfd, info, s_got, + "_GLOBAL_OFFSET_TABLE_"); + elf_hash_table (info)->hgot = h; + if (h == NULL) + return FALSE; + } + + return TRUE; +} + +/* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and + .rela.bss sections in DYNOBJ, and set up shortcuts to them in our + hash table. */ + +static bfd_boolean +riscv_elf_create_dynamic_sections (bfd *dynobj, + struct bfd_link_info *info) +{ + struct riscv_elf_link_hash_table *htab; + + htab = riscv_elf_hash_table (info); + BFD_ASSERT (htab != NULL); + + if (!riscv_elf_create_got_section (dynobj, info)) + return FALSE; + + if (!_bfd_elf_create_dynamic_sections (dynobj, info)) + return FALSE; + + htab->sdynbss = bfd_get_linker_section (dynobj, ".dynbss"); + if (!bfd_link_pic (info)) + { + htab->srelbss = bfd_get_linker_section (dynobj, ".rela.bss"); + htab->sdyntdata = + bfd_make_section_anyway_with_flags (dynobj, ".tdata.dyn", + SEC_ALLOC | SEC_THREAD_LOCAL); + } + + if (!htab->elf.splt || !htab->elf.srelplt || !htab->sdynbss + || (!bfd_link_pic (info) && (!htab->srelbss || !htab->sdyntdata))) + abort (); + + return TRUE; +} + +/* Copy the extra info we tack onto an elf_link_hash_entry. */ + +static void +riscv_elf_copy_indirect_symbol (struct bfd_link_info *info, + struct elf_link_hash_entry *dir, + struct elf_link_hash_entry *ind) +{ + struct riscv_elf_link_hash_entry *edir, *eind; + + edir = (struct riscv_elf_link_hash_entry *) dir; + eind = (struct riscv_elf_link_hash_entry *) ind; + + if (eind->dyn_relocs != NULL) + { + if (edir->dyn_relocs != NULL) + { + struct riscv_elf_dyn_relocs **pp; + struct riscv_elf_dyn_relocs *p; + + /* Add reloc counts against the indirect sym to the direct sym + list. Merge any entries against the same section. */ + for (pp = &eind->dyn_relocs; (p = *pp) != NULL; ) + { + struct riscv_elf_dyn_relocs *q; + + for (q = edir->dyn_relocs; q != NULL; q = q->next) + if (q->sec == p->sec) + { + q->pc_count += p->pc_count; + q->count += p->count; + *pp = p->next; + break; + } + if (q == NULL) + pp = &p->next; + } + *pp = edir->dyn_relocs; + } + + edir->dyn_relocs = eind->dyn_relocs; + eind->dyn_relocs = NULL; + } + + if (ind->root.type == bfd_link_hash_indirect + && dir->got.refcount <= 0) + { + edir->tls_type = eind->tls_type; + eind->tls_type = GOT_UNKNOWN; + } + _bfd_elf_link_hash_copy_indirect (info, dir, ind); +} + +static bfd_boolean +riscv_elf_record_tls_type (bfd *abfd, struct elf_link_hash_entry *h, + unsigned long symndx, char tls_type) +{ + char *new_tls_type = &_bfd_riscv_elf_tls_type (abfd, h, symndx); + + *new_tls_type |= tls_type; + if ((*new_tls_type & GOT_NORMAL) && (*new_tls_type & ~GOT_NORMAL)) + { + (*_bfd_error_handler) + (_("%B: `%s' accessed both as normal and thread local symbol"), + abfd, h ? h->root.root.string : "<local>"); + return FALSE; + } + return TRUE; +} + +static bfd_boolean +riscv_elf_record_got_reference (bfd *abfd, struct bfd_link_info *info, + struct elf_link_hash_entry *h, long symndx) +{ + struct riscv_elf_link_hash_table *htab = riscv_elf_hash_table (info); + Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr; + + if (htab->elf.sgot == NULL) + { + if (!riscv_elf_create_got_section (htab->elf.dynobj, info)) + return FALSE; + } + + if (h != NULL) + { + h->got.refcount += 1; + return TRUE; + } + + /* This is a global offset table entry for a local symbol. */ + if (elf_local_got_refcounts (abfd) == NULL) + { + bfd_size_type size = symtab_hdr->sh_info * (sizeof (bfd_vma) + 1); + if (!(elf_local_got_refcounts (abfd) = bfd_zalloc (abfd, size))) + return FALSE; + _bfd_riscv_elf_local_got_tls_type (abfd) + = (char *) (elf_local_got_refcounts (abfd) + symtab_hdr->sh_info); + } + elf_local_got_refcounts (abfd) [symndx] += 1; + + return TRUE; +} + +static bfd_boolean +bad_static_reloc (bfd *abfd, unsigned r_type, struct elf_link_hash_entry *h) +{ + (*_bfd_error_handler) + (_("%B: relocation %s against `%s' can not be used when making a shared " + "object; recompile with -fPIC"), + abfd, riscv_elf_rtype_to_howto (r_type)->name, + h != NULL ? h->root.root.string : "a local symbol"); + bfd_set_error (bfd_error_bad_value); + return FALSE; +} +/* Look through the relocs for a section during the first phase, and + allocate space in the global offset table or procedure linkage + table. */ + +static bfd_boolean +riscv_elf_check_relocs (bfd *abfd, struct bfd_link_info *info, + asection *sec, const Elf_Internal_Rela *relocs) +{ + struct riscv_elf_link_hash_table *htab; + Elf_Internal_Shdr *symtab_hdr; + struct elf_link_hash_entry **sym_hashes; + const Elf_Internal_Rela *rel; + asection *sreloc = NULL; + + if (bfd_link_relocatable (info)) + return TRUE; + + htab = riscv_elf_hash_table (info); + symtab_hdr = &elf_tdata (abfd)->symtab_hdr; + sym_hashes = elf_sym_hashes (abfd); + + if (htab->elf.dynobj == NULL) + htab->elf.dynobj = abfd; + + for (rel = relocs; rel < relocs + sec->reloc_count; rel++) + { + unsigned int r_type; + unsigned long r_symndx; + struct elf_link_hash_entry *h; + + r_symndx = ELFNN_R_SYM (rel->r_info); + r_type = ELFNN_R_TYPE (rel->r_info); + + if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr)) + { + (*_bfd_error_handler) (_("%B: bad symbol index: %d"), + abfd, r_symndx); + return FALSE; + } + + if (r_symndx < symtab_hdr->sh_info) + h = NULL; + else + { + h = sym_hashes[r_symndx - symtab_hdr->sh_info]; + while (h->root.type == bfd_link_hash_indirect + || h->root.type == bfd_link_hash_warning) + h = (struct elf_link_hash_entry *) h->root.u.i.link; + + /* PR15323, ref flags aren't set for references in the same + object. */ + h->root.non_ir_ref = 1; + } + + switch (r_type) + { + case R_RISCV_TLS_GD_HI20: + if (!riscv_elf_record_got_reference (abfd, info, h, r_symndx) + || !riscv_elf_record_tls_type (abfd, h, r_symndx, GOT_TLS_GD)) + return FALSE; + break; + + case R_RISCV_TLS_GOT_HI20: + if (bfd_link_pic (info)) + info->flags |= DF_STATIC_TLS; + if (!riscv_elf_record_got_reference (abfd, info, h, r_symndx) + || !riscv_elf_record_tls_type (abfd, h, r_symndx, GOT_TLS_IE)) + return FALSE; + break; + + case R_RISCV_GOT_HI20: + if (!riscv_elf_record_got_reference (abfd, info, h, r_symndx) + || !riscv_elf_record_tls_type (abfd, h, r_symndx, GOT_NORMAL)) + return FALSE; + break; + + case R_RISCV_CALL_PLT: + /* This symbol requires a procedure linkage table entry. We + actually build the entry in adjust_dynamic_symbol, + because this might be a case of linking PIC code without + linking in any dynamic objects, in which case we don't + need to generate a procedure linkage table after all. */ + + if (h != NULL) + { + h->needs_plt = 1; + h->plt.refcount += 1; + } + break; + + case R_RISCV_CALL: + case R_RISCV_JAL: + case R_RISCV_BRANCH: + case R_RISCV_RVC_BRANCH: + case R_RISCV_RVC_JUMP: + case R_RISCV_PCREL_HI20: + /* In shared libraries, these relocs are known to bind locally. */ + if (bfd_link_pic (info)) + break; + goto static_reloc; + + case R_RISCV_TPREL_HI20: + if (!bfd_link_executable (info)) + return bad_static_reloc (abfd, r_type, h); + if (h != NULL) + riscv_elf_record_tls_type (abfd, h, r_symndx, GOT_TLS_LE); + goto static_reloc; + + case R_RISCV_HI20: + if (bfd_link_pic (info)) + return bad_static_reloc (abfd, r_type, h); + /* Fall through. */ + + case R_RISCV_COPY: + case R_RISCV_JUMP_SLOT: + case R_RISCV_RELATIVE: + case R_RISCV_64: + case R_RISCV_32: + /* Fall through. */ + + static_reloc: + /* This reloc might not bind locally. */ + if (h != NULL) + h->non_got_ref = 1; + + if (h != NULL && !bfd_link_pic (info)) + { + /* We may need a .plt entry if the function this reloc + refers to is in a shared lib. */ + h->plt.refcount += 1; + } + + /* If we are creating a shared library, and this is a reloc + against a global symbol, or a non PC relative reloc + against a local symbol, then we need to copy the reloc + into the shared library. However, if we are linking with + -Bsymbolic, we do not need to copy a reloc against a + global symbol which is defined in an object we are + including in the link (i.e., DEF_REGULAR is set). At + this point we have not seen all the input files, so it is + possible that DEF_REGULAR is not set now but will be set + later (it is never cleared). In case of a weak definition, + DEF_REGULAR may be cleared later by a strong definition in + a shared library. We account for that possibility below by + storing information in the relocs_copied field of the hash + table entry. A similar situation occurs when creating + shared libraries and symbol visibility changes render the + symbol local. + + If on the other hand, we are creating an executable, we + may need to keep relocations for symbols satisfied by a + dynamic library if we manage to avoid copy relocs for the + symbol. */ + if ((bfd_link_pic (info) + && (sec->flags & SEC_ALLOC) != 0 + && (! riscv_elf_rtype_to_howto (r_type)->pc_relative + || (h != NULL + && (! info->symbolic + || h->root.type == bfd_link_hash_defweak + || !h->def_regular)))) + || (!bfd_link_pic (info) + && (sec->flags & SEC_ALLOC) != 0 + && h != NULL + && (h->root.type == bfd_link_hash_defweak + || !h->def_regular))) + { + struct riscv_elf_dyn_relocs *p; + struct riscv_elf_dyn_relocs **head; + + /* When creating a shared object, we must copy these + relocs into the output file. We create a reloc + section in dynobj and make room for the reloc. */ + if (sreloc == NULL) + { + sreloc = _bfd_elf_make_dynamic_reloc_section + (sec, htab->elf.dynobj, RISCV_ELF_LOG_WORD_BYTES, + abfd, /*rela?*/ TRUE); + + if (sreloc == NULL) + return FALSE; + } + + /* If this is a global symbol, we count the number of + relocations we need for this symbol. */ + if (h != NULL) + head = &((struct riscv_elf_link_hash_entry *) h)->dyn_relocs; + else + { + /* Track dynamic relocs needed for local syms too. + We really need local syms available to do this + easily. Oh well. */ + + asection *s; + void *vpp; + Elf_Internal_Sym *isym; + + isym = bfd_sym_from_r_symndx (&htab->sym_cache, + abfd, r_symndx); + if (isym == NULL) + return FALSE; + + s = bfd_section_from_elf_index (abfd, isym->st_shndx); + if (s == NULL) + s = sec; + + vpp = &elf_section_data (s)->local_dynrel; + head = (struct riscv_elf_dyn_relocs **) vpp; + } + + p = *head; + if (p == NULL || p->sec != sec) + { + bfd_size_type amt = sizeof *p; + p = ((struct riscv_elf_dyn_relocs *) + bfd_alloc (htab->elf.dynobj, amt)); + if (p == NULL) + return FALSE; + p->next = *head; + *head = p; + p->sec = sec; + p->count = 0; + p->pc_count = 0; + } + + p->count += 1; + p->pc_count += riscv_elf_rtype_to_howto (r_type)->pc_relative; + } + + break; + + case R_RISCV_GNU_VTINHERIT: + if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) + return FALSE; + break; + + case R_RISCV_GNU_VTENTRY: + if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) + return FALSE; + break; + + default: + break; + } + } + + return TRUE; +} + +static asection * +riscv_elf_gc_mark_hook (asection *sec, + struct bfd_link_info *info, + Elf_Internal_Rela *rel, + struct elf_link_hash_entry *h, + Elf_Internal_Sym *sym) +{ + if (h != NULL) + switch (ELFNN_R_TYPE (rel->r_info)) + { + case R_RISCV_GNU_VTINHERIT: + case R_RISCV_GNU_VTENTRY: + return NULL; + } + + return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); +} + +/* Update the got entry reference counts for the section being removed. */ + +static bfd_boolean +riscv_elf_gc_sweep_hook (bfd *abfd, + struct bfd_link_info *info, + asection *sec, + const Elf_Internal_Rela *relocs) +{ + const Elf_Internal_Rela *rel, *relend; + Elf_Internal_Shdr *symtab_hdr = &elf_symtab_hdr (abfd); + struct elf_link_hash_entry **sym_hashes = elf_sym_hashes (abfd); + bfd_signed_vma *local_got_refcounts = elf_local_got_refcounts (abfd); + + if (bfd_link_relocatable (info)) + return TRUE; + + elf_section_data (sec)->local_dynrel = NULL; + + for (rel = relocs, relend = relocs + sec->reloc_count; rel < relend; rel++) + { + unsigned long r_symndx; + struct elf_link_hash_entry *h = NULL; + + r_symndx = ELFNN_R_SYM (rel->r_info); + if (r_symndx >= symtab_hdr->sh_info) + { + struct riscv_elf_link_hash_entry *eh; + struct riscv_elf_dyn_relocs **pp; + struct riscv_elf_dyn_relocs *p; + + h = sym_hashes[r_symndx - symtab_hdr->sh_info]; + while (h->root.type == bfd_link_hash_indirect + || h->root.type == bfd_link_hash_warning) + h = (struct elf_link_hash_entry *) h->root.u.i.link; + eh = (struct riscv_elf_link_hash_entry *) h; + for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next) + if (p->sec == sec) + { + /* Everything must go for SEC. */ + *pp = p->next; + break; + } + } + + switch (ELFNN_R_TYPE (rel->r_info)) + { + case R_RISCV_GOT_HI20: + case R_RISCV_TLS_GOT_HI20: + case R_RISCV_TLS_GD_HI20: + if (h != NULL) + { + if (h->got.refcount > 0) + h->got.refcount--; + } + else + { + if (local_got_refcounts && + local_got_refcounts[r_symndx] > 0) + local_got_refcounts[r_symndx]--; + } + break; + + case R_RISCV_HI20: + case R_RISCV_PCREL_HI20: + case R_RISCV_COPY: + case R_RISCV_JUMP_SLOT: + case R_RISCV_RELATIVE: + case R_RISCV_64: + case R_RISCV_32: + case R_RISCV_BRANCH: + case R_RISCV_CALL: + case R_RISCV_JAL: + case R_RISCV_RVC_BRANCH: + case R_RISCV_RVC_JUMP: + if (bfd_link_pic (info)) + break; + /* Fall through. */ + + case R_RISCV_CALL_PLT: + if (h != NULL) + { + if (h->plt.refcount > 0) + h->plt.refcount--; + } + break; + + default: + break; + } + } + + return TRUE; +} + +/* Adjust a symbol defined by a dynamic object and referenced by a + regular object. The current definition is in some section of the + dynamic object, but we're not including those sections. We have to + change the definition to something the rest of the link can + understand. */ + +static bfd_boolean +riscv_elf_adjust_dynamic_symbol (struct bfd_link_info *info, + struct elf_link_hash_entry *h) +{ + struct riscv_elf_link_hash_table *htab; + struct riscv_elf_link_hash_entry * eh; + struct riscv_elf_dyn_relocs *p; + bfd *dynobj; + asection *s; + + htab = riscv_elf_hash_table (info); + BFD_ASSERT (htab != NULL); + + dynobj = htab->elf.dynobj; + + /* Make sure we know what is going on here. */ + BFD_ASSERT (dynobj != NULL + && (h->needs_plt + || h->type == STT_GNU_IFUNC + || h->u.weakdef != NULL + || (h->def_dynamic + && h->ref_regular + && !h->def_regular))); + + /* If this is a function, put it in the procedure linkage table. We + will fill in the contents of the procedure linkage table later + (although we could actually do it here). */ + if (h->type == STT_FUNC || h->type == STT_GNU_IFUNC || h->needs_plt) + { + if (h->plt.refcount <= 0 + || SYMBOL_CALLS_LOCAL (info, h) + || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT + && h->root.type == bfd_link_hash_undefweak)) + { + /* This case can occur if we saw a R_RISCV_CALL_PLT reloc in an + input file, but the symbol was never referred to by a dynamic + object, or if all references were garbage collected. In such + a case, we don't actually need to build a PLT entry. */ + h->plt.offset = (bfd_vma) -1; + h->needs_plt = 0; + } + + return TRUE; + } + else + h->plt.offset = (bfd_vma) -1; + + /* If this is a weak symbol, and there is a real definition, the + processor independent code will have arranged for us to see the + real definition first, and we can just use the same value. */ + if (h->u.weakdef != NULL) + { + BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined + || h->u.weakdef->root.type == bfd_link_hash_defweak); + h->root.u.def.section = h->u.weakdef->root.u.def.section; + h->root.u.def.value = h->u.weakdef->root.u.def.value; + return TRUE; + } + + /* This is a reference to a symbol defined by a dynamic object which + is not a function. */ + + /* If we are creating a shared library, we must presume that the + only references to the symbol are via the global offset table. + For such cases we need not do anything here; the relocations will + be handled correctly by relocate_section. */ + if (bfd_link_pic (info)) + return TRUE; + + /* If there are no references to this symbol that do not use the + GOT, we don't need to generate a copy reloc. */ + if (!h->non_got_ref) + return TRUE; + + /* If -z nocopyreloc was given, we won't generate them either. */ + if (info->nocopyreloc) + { + h->non_got_ref = 0; + return TRUE; + } + + eh = (struct riscv_elf_link_hash_entry *) h; + for (p = eh->dyn_relocs; p != NULL; p = p->next) + { + s = p->sec->output_section; + if (s != NULL && (s->flags & SEC_READONLY) != 0) + break; + } + + /* If we didn't find any dynamic relocs in read-only sections, then + we'll be keeping the dynamic relocs and avoiding the copy reloc. */ + if (p == NULL) + { + h->non_got_ref = 0; + return TRUE; + } + + /* We must allocate the symbol in our .dynbss section, which will + become part of the .bss section of the executable. There will be + an entry for this symbol in the .dynsym section. The dynamic + object will contain position independent code, so all references + from the dynamic object to this symbol will go through the global + offset table. The dynamic linker will use the .dynsym entry to + determine the address it must put in the global offset table, so + both the dynamic object and the regular object will refer to the + same memory location for the variable. */ + + /* We must generate a R_RISCV_COPY reloc to tell the dynamic linker + to copy the initial value out of the dynamic object and into the + runtime process image. We need to remember the offset into the + .rel.bss section we are going to use. */ + if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0) + { + htab->srelbss->size += sizeof (ElfNN_External_Rela); + h->needs_copy = 1; + } + + if (eh->tls_type & ~GOT_NORMAL) + return _bfd_elf_adjust_dynamic_copy (info, h, htab->sdyntdata); + + return _bfd_elf_adjust_dynamic_copy (info, h, htab->sdynbss); +} + +/* Allocate space in .plt, .got and associated reloc sections for + dynamic relocs. */ + +static bfd_boolean +allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf) +{ + struct bfd_link_info *info; + struct riscv_elf_link_hash_table *htab; + struct riscv_elf_link_hash_entry *eh; + struct riscv_elf_dyn_relocs *p; + + if (h->root.type == bfd_link_hash_indirect) + return TRUE; + + info = (struct bfd_link_info *) inf; + htab = riscv_elf_hash_table (info); + BFD_ASSERT (htab != NULL); + + if (htab->elf.dynamic_sections_created + && h->plt.refcount > 0) + { + /* Make sure this symbol is output as a dynamic symbol. + Undefined weak syms won't yet be marked as dynamic. */ + if (h->dynindx == -1 + && !h->forced_local) + { + if (! bfd_elf_link_record_dynamic_symbol (info, h)) + return FALSE; + } + + if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, bfd_link_pic (info), h)) + { + asection *s = htab->elf.splt; + + if (s->size == 0) + s->size = PLT_HEADER_SIZE; + + h->plt.offset = s->size; + + /* Make room for this entry. */ + s->size += PLT_ENTRY_SIZE; + + /* We also need to make an entry in the .got.plt section. */ + htab->elf.sgotplt->size += GOT_ENTRY_SIZE; + + /* We also need to make an entry in the .rela.plt section. */ + htab->elf.srelplt->size += sizeof (ElfNN_External_Rela); + + /* If this symbol is not defined in a regular file, and we are + not generating a shared library, then set the symbol to this + location in the .plt. This is required to make function + pointers compare as equal between the normal executable and + the shared library. */ + if (! bfd_link_pic (info) + && !h->def_regular) + { + h->root.u.def.section = s; + h->root.u.def.value = h->plt.offset; + } + } + else + { + h->plt.offset = (bfd_vma) -1; + h->needs_plt = 0; + } + } + else + { + h->plt.offset = (bfd_vma) -1; + h->needs_plt = 0; + } + + if (h->got.refcount > 0) + { + asection *s; + bfd_boolean dyn; + int tls_type = riscv_elf_hash_entry (h)->tls_type; + + /* Make sure this symbol is output as a dynamic symbol. + Undefined weak syms won't yet be marked as dynamic. */ + if (h->dynindx == -1 + && !h->forced_local) + { + if (! bfd_elf_link_record_dynamic_symbol (info, h)) + return FALSE; + } + + s = htab->elf.sgot; + h->got.offset = s->size; + dyn = htab->elf.dynamic_sections_created; + if (tls_type & (GOT_TLS_GD | GOT_TLS_IE)) + { + /* TLS_GD needs two dynamic relocs and two GOT slots. */ + if (tls_type & GOT_TLS_GD) + { + s->size += 2 * RISCV_ELF_WORD_BYTES; + htab->elf.srelgot->size += 2 * sizeof (ElfNN_External_Rela); + } + + /* TLS_IE needs one dynamic reloc and one GOT slot. */ + if (tls_type & GOT_TLS_IE) + { + s->size += RISCV_ELF_WORD_BYTES; + htab->elf.srelgot->size += sizeof (ElfNN_External_Rela); + } + } + else + { + s->size += RISCV_ELF_WORD_BYTES; + if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, bfd_link_pic (info), h)) + htab->elf.srelgot->size += sizeof (ElfNN_External_Rela); + } + } + else + h->got.offset = (bfd_vma) -1; + + eh = (struct riscv_elf_link_hash_entry *) h; + if (eh->dyn_relocs == NULL) + return TRUE; + + /* In the shared -Bsymbolic case, discard space allocated for + dynamic pc-relative relocs against symbols which turn out to be + defined in regular objects. For the normal shared case, discard + space for pc-relative relocs that have become local due to symbol + visibility changes. */ + + if (bfd_link_pic (info)) + { + if (SYMBOL_CALLS_LOCAL (info, h)) + { + struct riscv_elf_dyn_relocs **pp; + + for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) + { + p->count -= p->pc_count; + p->pc_count = 0; + if (p->count == 0) + *pp = p->next; + else + pp = &p->next; + } + } + + /* Also discard relocs on undefined weak syms with non-default + visibility. */ + if (eh->dyn_relocs != NULL + && h->root.type == bfd_link_hash_undefweak) + { + if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) + eh->dyn_relocs = NULL; + + /* Make sure undefined weak symbols are output as a dynamic + symbol in PIEs. */ + else if (h->dynindx == -1 + && !h->forced_local) + { + if (! bfd_elf_link_record_dynamic_symbol (info, h)) + return FALSE; + } + } + } + else + { + /* For the non-shared case, discard space for relocs against + symbols which turn out to need copy relocs or are not + dynamic. */ + + if (!h->non_got_ref + && ((h->def_dynamic + && !h->def_regular) + || (htab->elf.dynamic_sections_created + && (h->root.type == bfd_link_hash_undefweak + || h->root.type == bfd_link_hash_undefined)))) + { + /* Make sure this symbol is output as a dynamic symbol. + Undefined weak syms won't yet be marked as dynamic. */ + if (h->dynindx == -1 + && !h->forced_local) + { + if (! bfd_elf_link_record_dynamic_symbol (info, h)) + return FALSE; + } + + /* If that succeeded, we know we'll be keeping all the + relocs. */ + if (h->dynindx != -1) + goto keep; + } + + eh->dyn_relocs = NULL; + + keep: ; + } + + /* Finally, allocate space. */ + for (p = eh->dyn_relocs; p != NULL; p = p->next) + { + asection *sreloc = elf_section_data (p->sec)->sreloc; + sreloc->size += p->count * sizeof (ElfNN_External_Rela); + } + + return TRUE; +} + +/* Find any dynamic relocs that apply to read-only sections. */ + +static bfd_boolean +readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf) +{ + struct riscv_elf_link_hash_entry *eh; + struct riscv_elf_dyn_relocs *p; + + eh = (struct riscv_elf_link_hash_entry *) h; + for (p = eh->dyn_relocs; p != NULL; p = p->next) + { + asection *s = p->sec->output_section; + + if (s != NULL && (s->flags & SEC_READONLY) != 0) + { + ((struct bfd_link_info *) inf)->flags |= DF_TEXTREL; + return FALSE; + } + } + return TRUE; +} + +static bfd_boolean +riscv_elf_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info) +{ + struct riscv_elf_link_hash_table *htab; + bfd *dynobj; + asection *s; + bfd *ibfd; + + htab = riscv_elf_hash_table (info); + BFD_ASSERT (htab != NULL); + dynobj = htab->elf.dynobj; + BFD_ASSERT (dynobj != NULL); + + if (elf_hash_table (info)->dynamic_sections_created) + { + /* Set the contents of the .interp section to the interpreter. */ + if (bfd_link_executable (info) && !info->nointerp) + { + s = bfd_get_linker_section (dynobj, ".interp"); + BFD_ASSERT (s != NULL); + s->size = strlen (ELFNN_DYNAMIC_INTERPRETER) + 1; + s->contents = (unsigned char *) ELFNN_DYNAMIC_INTERPRETER; + } + } + + /* Set up .got offsets for local syms, and space for local dynamic + relocs. */ + for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next) + { + bfd_signed_vma *local_got; + bfd_signed_vma *end_local_got; + char *local_tls_type; + bfd_size_type locsymcount; + Elf_Internal_Shdr *symtab_hdr; + asection *srel; + + if (! is_riscv_elf (ibfd)) + continue; + + for (s = ibfd->sections; s != NULL; s = s->next) + { + struct riscv_elf_dyn_relocs *p; + + for (p = elf_section_data (s)->local_dynrel; p != NULL; p = p->next) + { + if (!bfd_is_abs_section (p->sec) + && bfd_is_abs_section (p->sec->output_section)) + { + /* Input section has been discarded, either because + it is a copy of a linkonce section or due to + linker script /DISCARD/, so we'll be discarding + the relocs too. */ + } + else if (p->count != 0) + { + srel = elf_section_data (p->sec)->sreloc; + srel->size += p->count * sizeof (ElfNN_External_Rela); + if ((p->sec->output_section->flags & SEC_READONLY) != 0) + info->flags |= DF_TEXTREL; + } + } + } + + local_got = elf_local_got_refcounts (ibfd); + if (!local_got) + continue; + + symtab_hdr = &elf_symtab_hdr (ibfd); + locsymcount = symtab_hdr->sh_info; + end_local_got = local_got + locsymcount; + local_tls_type = _bfd_riscv_elf_local_got_tls_type (ibfd); + s = htab->elf.sgot; + srel = htab->elf.srelgot; + for (; local_got < end_local_got; ++local_got, ++local_tls_type) + { + if (*local_got > 0) + { + *local_got = s->size; + s->size += RISCV_ELF_WORD_BYTES; + if (*local_tls_type & GOT_TLS_GD) + s->size += RISCV_ELF_WORD_BYTES; + if (bfd_link_pic (info) + || (*local_tls_type & (GOT_TLS_GD | GOT_TLS_IE))) + srel->size += sizeof (ElfNN_External_Rela); + } + else + *local_got = (bfd_vma) -1; + } + } + + /* Allocate global sym .plt and .got entries, and space for global + sym dynamic relocs. */ + elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, info); + + if (htab->elf.sgotplt) + { + struct elf_link_hash_entry *got; + got = elf_link_hash_lookup (elf_hash_table (info), + "_GLOBAL_OFFSET_TABLE_", + FALSE, FALSE, FALSE); + + /* Don't allocate .got.plt section if there are no GOT nor PLT + entries and there is no refeence to _GLOBAL_OFFSET_TABLE_. */ + if ((got == NULL + || !got->ref_regular_nonweak) + && (htab->elf.sgotplt->size == GOTPLT_HEADER_SIZE) + && (htab->elf.splt == NULL + || htab->elf.splt->size == 0) + && (htab->elf.sgot == NULL + || (htab->elf.sgot->size + == get_elf_backend_data (output_bfd)->got_header_size))) + htab->elf.sgotplt->size = 0; + } + + /* The check_relocs and adjust_dynamic_symbol entry points have + determined the sizes of the various dynamic sections. Allocate + memory for them. */ + for (s = dynobj->sections; s != NULL; s = s->next) + { + if ((s->flags & SEC_LINKER_CREATED) == 0) + continue; + + if (s == htab->elf.splt + || s == htab->elf.sgot + || s == htab->elf.sgotplt + || s == htab->sdynbss) + { + /* Strip this section if we don't need it; see the + comment below. */ + } + else if (strncmp (s->name, ".rela", 5) == 0) + { + if (s->size != 0) + { + /* We use the reloc_count field as a counter if we need + to copy relocs into the output file. */ + s->reloc_count = 0; + } + } + else + { + /* It's not one of our sections. */ + continue; + } + + if (s->size == 0) + { + /* If we don't need this section, strip it from the + output file. This is mostly to handle .rela.bss and + .rela.plt. We must create both sections in + create_dynamic_sections, because they must be created + before the linker maps input sections to output + sections. The linker does that before + adjust_dynamic_symbol is called, and it is that + function which decides whether anything needs to go + into these sections. */ + s->flags |= SEC_EXCLUDE; + continue; + } + + if ((s->flags & SEC_HAS_CONTENTS) == 0) + continue; + + /* Allocate memory for the section contents. Zero the memory + for the benefit of .rela.plt, which has 4 unused entries + at the beginning, and we don't want garbage. */ + s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size); + if (s->contents == NULL) + return FALSE; + } + + if (elf_hash_table (info)->dynamic_sections_created) + { + /* Add some entries to the .dynamic section. We fill in the + values later, in riscv_elf_finish_dynamic_sections, but we + must add the entries now so that we get the correct size for + the .dynamic section. The DT_DEBUG entry is filled in by the + dynamic linker and used by the debugger. */ +#define add_dynamic_entry(TAG, VAL) \ + _bfd_elf_add_dynamic_entry (info, TAG, VAL) + + if (bfd_link_executable (info)) + { + if (!add_dynamic_entry (DT_DEBUG, 0)) + return FALSE; + } + + if (htab->elf.srelplt->size != 0) + { + if (!add_dynamic_entry (DT_PLTGOT, 0) + || !add_dynamic_entry (DT_PLTRELSZ, 0) + || !add_dynamic_entry (DT_PLTREL, DT_RELA) + || !add_dynamic_entry (DT_JMPREL, 0)) + return FALSE; + } + + if (!add_dynamic_entry (DT_RELA, 0) + || !add_dynamic_entry (DT_RELASZ, 0) + || !add_dynamic_entry (DT_RELAENT, sizeof (ElfNN_External_Rela))) + return FALSE; + + /* If any dynamic relocs apply to a read-only section, + then we need a DT_TEXTREL entry. */ + if ((info->flags & DF_TEXTREL) == 0) + elf_link_hash_traverse (&htab->elf, readonly_dynrelocs, info); + + if (info->flags & DF_TEXTREL) + { + if (!add_dynamic_entry (DT_TEXTREL, 0)) + return FALSE; + } + } +#undef add_dynamic_entry + + return TRUE; +} + +#define TP_OFFSET 0 +#define DTP_OFFSET 0x800 + +/* Return the relocation value for a TLS dtp-relative reloc. */ + +static bfd_vma +dtpoff (struct bfd_link_info *info, bfd_vma address) +{ + /* If tls_sec is NULL, we should have signalled an error already. */ + if (elf_hash_table (info)->tls_sec == NULL) + return 0; + return address - elf_hash_table (info)->tls_sec->vma - DTP_OFFSET; +} + +/* Return the relocation value for a static TLS tp-relative relocation. */ + +static bfd_vma +tpoff (struct bfd_link_info *info, bfd_vma address) +{ + /* If tls_sec is NULL, we should have signalled an error already. */ + if (elf_hash_table (info)->tls_sec == NULL) + return 0; + return address - elf_hash_table (info)->tls_sec->vma - TP_OFFSET; +} + +/* Return the global pointer's value, or 0 if it is not in use. */ + +static bfd_vma +riscv_global_pointer_value (struct bfd_link_info *info) +{ + struct bfd_link_hash_entry *h; + + h = bfd_link_hash_lookup (info->hash, "_gp", FALSE, FALSE, TRUE); + if (h == NULL || h->type != bfd_link_hash_defined) + return 0; + + return h->u.def.value + sec_addr (h->u.def.section); +} + +/* Emplace a static relocation. */ + +static bfd_reloc_status_type +perform_relocation (const reloc_howto_type *howto, + const Elf_Internal_Rela *rel, + bfd_vma value, + asection *input_section, + bfd *input_bfd, + bfd_byte *contents) +{ + if (howto->pc_relative) + value -= sec_addr (input_section) + rel->r_offset; + value += rel->r_addend; + + switch (ELFNN_R_TYPE (rel->r_info)) + { + case R_RISCV_HI20: + case R_RISCV_TPREL_HI20: + case R_RISCV_PCREL_HI20: + case R_RISCV_GOT_HI20: + case R_RISCV_TLS_GOT_HI20: + case R_RISCV_TLS_GD_HI20: + if (ARCH_SIZE > 32 && !VALID_UTYPE_IMM (RISCV_CONST_HIGH_PART (value))) + return bfd_reloc_overflow; + value = ENCODE_UTYPE_IMM (RISCV_CONST_HIGH_PART (value)); + break; + + case R_RISCV_LO12_I: + case R_RISCV_GPREL_I: + case R_RISCV_TPREL_LO12_I: + case R_RISCV_PCREL_LO12_I: + value = ENCODE_ITYPE_IMM (value); + break; + + case R_RISCV_LO12_S: + case R_RISCV_GPREL_S: + case R_RISCV_TPREL_LO12_S: + case R_RISCV_PCREL_LO12_S: + value = ENCODE_STYPE_IMM (value); + break; + + case R_RISCV_CALL: + case R_RISCV_CALL_PLT: + if (ARCH_SIZE > 32 && !VALID_UTYPE_IMM (RISCV_CONST_HIGH_PART (value))) + return bfd_reloc_overflow; + value = ENCODE_UTYPE_IMM (RISCV_CONST_HIGH_PART (value)) + | (ENCODE_ITYPE_IMM (value) << 32); + break; + + case R_RISCV_JAL: + if (!VALID_UJTYPE_IMM (value)) + return bfd_reloc_overflow; + value = ENCODE_UJTYPE_IMM (value); + break; + + case R_RISCV_BRANCH: + if (!VALID_SBTYPE_IMM (value)) + return bfd_reloc_overflow; + value = ENCODE_SBTYPE_IMM (value); + break; + + case R_RISCV_RVC_BRANCH: + if (!VALID_RVC_B_IMM (value)) + return bfd_reloc_overflow; + value = ENCODE_RVC_B_IMM (value); + break; + + case R_RISCV_RVC_JUMP: + if (!VALID_RVC_J_IMM (value)) + return bfd_reloc_overflow; + value = ENCODE_RVC_J_IMM (value); + break; + + case R_RISCV_RVC_LUI: + if (!VALID_RVC_LUI_IMM (RISCV_CONST_HIGH_PART (value))) + return bfd_reloc_overflow; + value = ENCODE_RVC_LUI_IMM (RISCV_CONST_HIGH_PART (value)); + break; + + case R_RISCV_32: + case R_RISCV_64: + case R_RISCV_ADD8: + case R_RISCV_ADD16: + case R_RISCV_ADD32: + case R_RISCV_ADD64: + case R_RISCV_SUB8: + case R_RISCV_SUB16: + case R_RISCV_SUB32: + case R_RISCV_SUB64: + case R_RISCV_TLS_DTPREL32: + case R_RISCV_TLS_DTPREL64: + break; + + default: + return bfd_reloc_notsupported; + } + + bfd_vma word = bfd_get (howto->bitsize, input_bfd, contents + rel->r_offset); + word = (word & ~howto->dst_mask) | (value & howto->dst_mask); + bfd_put (howto->bitsize, input_bfd, word, contents + rel->r_offset); + + return bfd_reloc_ok; +} + +/* Remember all PC-relative high-part relocs we've encountered to help us + later resolve the corresponding low-part relocs. */ + +typedef struct +{ + bfd_vma address; + bfd_vma value; +} riscv_pcrel_hi_reloc; + +typedef struct riscv_pcrel_lo_reloc +{ + asection * input_section; + struct bfd_link_info * info; + reloc_howto_type * howto; + const Elf_Internal_Rela * reloc; + bfd_vma addr; + const char * name; + bfd_byte * contents; + struct riscv_pcrel_lo_reloc * next; +} riscv_pcrel_lo_reloc; + +typedef struct +{ + htab_t hi_relocs; + riscv_pcrel_lo_reloc *lo_relocs; +} riscv_pcrel_relocs; + +static hashval_t +riscv_pcrel_reloc_hash (const void *entry) +{ + const riscv_pcrel_hi_reloc *e = entry; + return (hashval_t)(e->address >> 2); +} + +static bfd_boolean +riscv_pcrel_reloc_eq (const void *entry1, const void *entry2) +{ + const riscv_pcrel_hi_reloc *e1 = entry1, *e2 = entry2; + return e1->address == e2->address; +} + +static bfd_boolean +riscv_init_pcrel_relocs (riscv_pcrel_relocs *p) +{ + + p->lo_relocs = NULL; + p->hi_relocs = htab_create (1024, riscv_pcrel_reloc_hash, + riscv_pcrel_reloc_eq, free); + return p->hi_relocs != NULL; +} + +static void +riscv_free_pcrel_relocs (riscv_pcrel_relocs *p) +{ + riscv_pcrel_lo_reloc *cur = p->lo_relocs; + + while (cur != NULL) + { + riscv_pcrel_lo_reloc *next = cur->next; + free (cur); + cur = next; + } + + htab_delete (p->hi_relocs); +} + +static bfd_boolean +riscv_record_pcrel_hi_reloc (riscv_pcrel_relocs *p, bfd_vma addr, bfd_vma value) +{ + riscv_pcrel_hi_reloc entry = {addr, value - addr}; + riscv_pcrel_hi_reloc **slot = + (riscv_pcrel_hi_reloc **) htab_find_slot (p->hi_relocs, &entry, INSERT); + + BFD_ASSERT (*slot == NULL); + *slot = (riscv_pcrel_hi_reloc *) bfd_malloc (sizeof (riscv_pcrel_hi_reloc)); + if (*slot == NULL) + return FALSE; + **slot = entry; + return TRUE; +} + +static bfd_boolean +riscv_record_pcrel_lo_reloc (riscv_pcrel_relocs *p, + asection *input_section, + struct bfd_link_info *info, + reloc_howto_type *howto, + const Elf_Internal_Rela *reloc, + bfd_vma addr, + const char *name, + bfd_byte *contents) +{ + riscv_pcrel_lo_reloc *entry; + entry = (riscv_pcrel_lo_reloc *) bfd_malloc (sizeof (riscv_pcrel_lo_reloc)); + if (entry == NULL) + return FALSE; + *entry = (riscv_pcrel_lo_reloc) {input_section, info, howto, reloc, addr, + name, contents, p->lo_relocs}; + p->lo_relocs = entry; + return TRUE; +} + +static bfd_boolean +riscv_resolve_pcrel_lo_relocs (riscv_pcrel_relocs *p) +{ + riscv_pcrel_lo_reloc *r; + + for (r = p->lo_relocs; r != NULL; r = r->next) + { + bfd *input_bfd = r->input_section->owner; + + riscv_pcrel_hi_reloc search = {r->addr, 0}; + riscv_pcrel_hi_reloc *entry = htab_find (p->hi_relocs, &search); + if (entry == NULL) + { + ((*r->info->callbacks->reloc_overflow) + (r->info, NULL, r->name, r->howto->name, (bfd_vma) 0, + input_bfd, r->input_section, r->reloc->r_offset)); + return TRUE; + } + + perform_relocation (r->howto, r->reloc, entry->value, r->input_section, + input_bfd, r->contents); + } + + return TRUE; +} + +/* Relocate a RISC-V ELF section. + + The RELOCATE_SECTION function is called by the new ELF backend linker + to handle the relocations for a section. + + The relocs are always passed as Rela structures. + + This function is responsible for adjusting the section contents as + necessary, and (if generating a relocatable output file) adjusting + the reloc addend as necessary. + + This function does not have to worry about setting the reloc + address or the reloc symbol index. + + LOCAL_SYMS is a pointer to the swapped in local symbols. + + LOCAL_SECTIONS is an array giving the section in the input file + corresponding to the st_shndx field of each local symbol. + + The global hash table entry for the global symbols can be found + via elf_sym_hashes (input_bfd). + + When generating relocatable output, this function must handle + STB_LOCAL/STT_SECTION symbols specially. The output symbol is + going to be the section symbol corresponding to the output + section, which means that the addend must be adjusted + accordingly. */ + +static bfd_boolean +riscv_elf_relocate_section (bfd *output_bfd, + struct bfd_link_info *info, + bfd *input_bfd, + asection *input_section, + bfd_byte *contents, + Elf_Internal_Rela *relocs, + Elf_Internal_Sym *local_syms, + asection **local_sections) +{ + Elf_Internal_Rela *rel; + Elf_Internal_Rela *relend; + riscv_pcrel_relocs pcrel_relocs; + bfd_boolean ret = FALSE; + asection *sreloc = elf_section_data (input_section)->sreloc; + struct riscv_elf_link_hash_table *htab = riscv_elf_hash_table (info); + Elf_Internal_Shdr *symtab_hdr = &elf_symtab_hdr (input_bfd); + struct elf_link_hash_entry **sym_hashes = elf_sym_hashes (input_bfd); + bfd_vma *local_got_offsets = elf_local_got_offsets (input_bfd); + + if (!riscv_init_pcrel_relocs (&pcrel_relocs)) + return FALSE; + + relend = relocs + input_section->reloc_count; + for (rel = relocs; rel < relend; rel++) + { + unsigned long r_symndx; + struct elf_link_hash_entry *h; + Elf_Internal_Sym *sym; + asection *sec; + bfd_vma relocation; + bfd_reloc_status_type r = bfd_reloc_ok; + const char *name; + bfd_vma off, ie_off; + bfd_boolean unresolved_reloc, is_ie = FALSE; + bfd_vma pc = sec_addr (input_section) + rel->r_offset; + int r_type = ELFNN_R_TYPE (rel->r_info), tls_type; + reloc_howto_type *howto = riscv_elf_rtype_to_howto (r_type); + const char *msg = NULL; + + if (r_type == R_RISCV_GNU_VTINHERIT || r_type == R_RISCV_GNU_VTENTRY) + continue; + + /* This is a final link. */ + r_symndx = ELFNN_R_SYM (rel->r_info); + h = NULL; + sym = NULL; + sec = NULL; + unresolved_reloc = FALSE; + if (r_symndx < symtab_hdr->sh_info) + { + sym = local_syms + r_symndx; + sec = local_sections[r_symndx]; + relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); + } + else + { + bfd_boolean warned, ignored; + + RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, + r_symndx, symtab_hdr, sym_hashes, + h, sec, relocation, + unresolved_reloc, warned, ignored); + if (warned) + { + /* To avoid generating warning messages about truncated + relocations, set the relocation's address to be the same as + the start of this section. */ + if (input_section->output_section != NULL) + relocation = input_section->output_section->vma; + else + relocation = 0; + } + } + + if (sec != NULL && discarded_section (sec)) + RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, + rel, 1, relend, howto, 0, contents); + + if (bfd_link_relocatable (info)) + continue; + + if (h != NULL) + name = h->root.root.string; + else + { + name = (bfd_elf_string_from_elf_section + (input_bfd, symtab_hdr->sh_link, sym->st_name)); + if (name == NULL || *name == '\0') + name = bfd_section_name (input_bfd, sec); + } + + switch (r_type) + { + case R_RISCV_NONE: + case R_RISCV_TPREL_ADD: + case R_RISCV_COPY: + case R_RISCV_JUMP_SLOT: + case R_RISCV_RELATIVE: + /* These require nothing of us at all. */ + continue; + + case R_RISCV_HI20: + case R_RISCV_BRANCH: + case R_RISCV_RVC_BRANCH: + case R_RISCV_RVC_LUI: + case R_RISCV_LO12_I: + case R_RISCV_LO12_S: + /* These require no special handling beyond perform_relocation. */ + break; + + case R_RISCV_GOT_HI20: + if (h != NULL) + { + bfd_boolean dyn, pic; + + off = h->got.offset; + BFD_ASSERT (off != (bfd_vma) -1); + dyn = elf_hash_table (info)->dynamic_sections_created; + pic = bfd_link_pic (info); + + if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, pic, h) + || (pic && SYMBOL_REFERENCES_LOCAL (info, h))) + { + /* This is actually a static link, or it is a + -Bsymbolic link and the symbol is defined + locally, or the symbol was forced to be local + because of a version file. We must initialize + this entry in the global offset table. Since the + offset must always be a multiple of the word size, + we use the least significant bit to record whether + we have initialized it already. + + When doing a dynamic link, we create a .rela.got + relocation entry to initialize the value. This + is done in the finish_dynamic_symbol routine. */ + if ((off & 1) != 0) + off &= ~1; + else + { + bfd_put_NN (output_bfd, relocation, + htab->elf.sgot->contents + off); + h->got.offset |= 1; + } + } + else + unresolved_reloc = FALSE; + } + else + { + BFD_ASSERT (local_got_offsets != NULL + && local_got_offsets[r_symndx] != (bfd_vma) -1); + + off = local_got_offsets[r_symndx]; + + /* The offset must always be a multiple of the word size. + So, we can use the least significant bit to record + whether we have already processed this entry. */ + if ((off & 1) != 0) + off &= ~1; + else + { + if (bfd_link_pic (info)) + { + asection *s; + Elf_Internal_Rela outrel; + + /* We need to generate a R_RISCV_RELATIVE reloc + for the dynamic linker. */ + s = htab->elf.srelgot; + BFD_ASSERT (s != NULL); + + outrel.r_offset = sec_addr (htab->elf.sgot) + off; + outrel.r_info = + ELFNN_R_INFO (0, R_RISCV_RELATIVE); + outrel.r_addend = relocation; + relocation = 0; + riscv_elf_append_rela (output_bfd, s, &outrel); + } + + bfd_put_NN (output_bfd, relocation, + htab->elf.sgot->contents + off); + local_got_offsets[r_symndx] |= 1; + } + } + relocation = sec_addr (htab->elf.sgot) + off; + if (!riscv_record_pcrel_hi_reloc (&pcrel_relocs, pc, relocation)) + r = bfd_reloc_overflow; + break; + + case R_RISCV_ADD8: + case R_RISCV_ADD16: + case R_RISCV_ADD32: + case R_RISCV_ADD64: + { + bfd_vma old_value = bfd_get (howto->bitsize, input_bfd, + contents + rel->r_offset); + relocation = old_value + relocation; + } + break; + + case R_RISCV_SUB8: + case R_RISCV_SUB16: + case R_RISCV_SUB32: + case R_RISCV_SUB64: + { + bfd_vma old_value = bfd_get (howto->bitsize, input_bfd, + contents + rel->r_offset); + relocation = old_value - relocation; + } + break; + + case R_RISCV_CALL_PLT: + case R_RISCV_CALL: + case R_RISCV_JAL: + case R_RISCV_RVC_JUMP: + if (bfd_link_pic (info) && h != NULL && h->plt.offset != MINUS_ONE) + { + /* Refer to the PLT entry. */ + relocation = sec_addr (htab->elf.splt) + h->plt.offset; + unresolved_reloc = FALSE; + } + break; + + case R_RISCV_TPREL_HI20: + relocation = tpoff (info, relocation); + break; + + case R_RISCV_TPREL_LO12_I: + case R_RISCV_TPREL_LO12_S: + relocation = tpoff (info, relocation); + if (VALID_ITYPE_IMM (relocation + rel->r_addend)) + { + /* We can use tp as the base register. */ + bfd_vma insn = bfd_get_32 (input_bfd, contents + rel->r_offset); + insn &= ~(OP_MASK_RS1 << OP_SH_RS1); + insn |= X_TP << OP_SH_RS1; + bfd_put_32 (input_bfd, insn, contents + rel->r_offset); + } + break; + + case R_RISCV_GPREL_I: + case R_RISCV_GPREL_S: + { + bfd_vma gp = riscv_global_pointer_value (info); + bfd_boolean x0_base = VALID_ITYPE_IMM (relocation + rel->r_addend); + if (x0_base || VALID_ITYPE_IMM (relocation + rel->r_addend - gp)) + { + /* We can use x0 or gp as the base register. */ + bfd_vma insn = bfd_get_32 (input_bfd, contents + rel->r_offset); + insn &= ~(OP_MASK_RS1 << OP_SH_RS1); + if (!x0_base) + { + rel->r_addend -= gp; + insn |= X_GP << OP_SH_RS1; + } + bfd_put_32 (input_bfd, insn, contents + rel->r_offset); + } + else + r = bfd_reloc_overflow; + break; + } + + case R_RISCV_PCREL_HI20: + if (!riscv_record_pcrel_hi_reloc (&pcrel_relocs, pc, + relocation + rel->r_addend)) + r = bfd_reloc_overflow; + break; + + case R_RISCV_PCREL_LO12_I: + case R_RISCV_PCREL_LO12_S: + if (riscv_record_pcrel_lo_reloc (&pcrel_relocs, input_section, info, + howto, rel, relocation, name, + contents)) + continue; + r = bfd_reloc_overflow; + break; + + case R_RISCV_TLS_DTPREL32: + case R_RISCV_TLS_DTPREL64: + relocation = dtpoff (info, relocation); + break; + + case R_RISCV_32: + case R_RISCV_64: + if ((input_section->flags & SEC_ALLOC) == 0) + break; + + if ((bfd_link_pic (info) + && (h == NULL + || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT + || h->root.type != bfd_link_hash_undefweak) + && (! howto->pc_relative + || !SYMBOL_CALLS_LOCAL (info, h))) + || (!bfd_link_pic (info) + && h != NULL + && h->dynindx != -1 + && !h->non_got_ref + && ((h->def_dynamic + && !h->def_regular) + || h->root.type == bfd_link_hash_undefweak + || h->root.type == bfd_link_hash_undefined))) + { + Elf_Internal_Rela outrel; + bfd_boolean skip_static_relocation, skip_dynamic_relocation; + + /* When generating a shared object, these relocations + are copied into the output file to be resolved at run + time. */ + + outrel.r_offset = + _bfd_elf_section_offset (output_bfd, info, input_section, + rel->r_offset); + skip_static_relocation = outrel.r_offset != (bfd_vma) -2; + skip_dynamic_relocation = outrel.r_offset >= (bfd_vma) -2; + outrel.r_offset += sec_addr (input_section); + + if (skip_dynamic_relocation) + memset (&outrel, 0, sizeof outrel); + else if (h != NULL && h->dynindx != -1 + && !(bfd_link_pic (info) + && SYMBOLIC_BIND (info, h) + && h->def_regular)) + { + outrel.r_info = ELFNN_R_INFO (h->dynindx, r_type); + outrel.r_addend = rel->r_addend; + } + else + { + outrel.r_info = ELFNN_R_INFO (0, R_RISCV_RELATIVE); + outrel.r_addend = relocation + rel->r_addend; + } + + riscv_elf_append_rela (output_bfd, sreloc, &outrel); + if (skip_static_relocation) + continue; + } + break; + + case R_RISCV_TLS_GOT_HI20: + is_ie = TRUE; + /* Fall through. */ + + case R_RISCV_TLS_GD_HI20: + if (h != NULL) + { + off = h->got.offset; + h->got.offset |= 1; + } + else + { + off = local_got_offsets[r_symndx]; + local_got_offsets[r_symndx] |= 1; + } + + tls_type = _bfd_riscv_elf_tls_type (input_bfd, h, r_symndx); + BFD_ASSERT (tls_type & (GOT_TLS_IE | GOT_TLS_GD)); + /* If this symbol is referenced by both GD and IE TLS, the IE + reference's GOT slot follows the GD reference's slots. */ + ie_off = 0; + if ((tls_type & GOT_TLS_GD) && (tls_type & GOT_TLS_IE)) + ie_off = 2 * GOT_ENTRY_SIZE; + + if ((off & 1) != 0) + off &= ~1; + else + { + Elf_Internal_Rela outrel; + int indx = 0; + bfd_boolean need_relocs = FALSE; + + if (htab->elf.srelgot == NULL) + abort (); + + if (h != NULL) + { + bfd_boolean dyn, pic; + dyn = htab->elf.dynamic_sections_created; + pic = bfd_link_pic (info); + + if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, pic, h) + && (!pic || !SYMBOL_REFERENCES_LOCAL (info, h))) + indx = h->dynindx; + } + + /* The GOT entries have not been initialized yet. Do it + now, and emit any relocations. */ + if ((bfd_link_pic (info) || indx != 0) + && (h == NULL + || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT + || h->root.type != bfd_link_hash_undefweak)) + need_relocs = TRUE; + + if (tls_type & GOT_TLS_GD) + { + if (need_relocs) + { + outrel.r_offset = sec_addr (htab->elf.sgot) + off; + outrel.r_addend = 0; + outrel.r_info = ELFNN_R_INFO (indx, R_RISCV_TLS_DTPMODNN); + bfd_put_NN (output_bfd, 0, + htab->elf.sgot->contents + off); + riscv_elf_append_rela (output_bfd, htab->elf.srelgot, &outrel); + if (indx == 0) + { + BFD_ASSERT (! unresolved_reloc); + bfd_put_NN (output_bfd, + dtpoff (info, relocation), + (htab->elf.sgot->contents + off + + RISCV_ELF_WORD_BYTES)); + } + else + { + bfd_put_NN (output_bfd, 0, + (htab->elf.sgot->contents + off + + RISCV_ELF_WORD_BYTES)); + outrel.r_info = ELFNN_R_INFO (indx, R_RISCV_TLS_DTPRELNN); + outrel.r_offset += RISCV_ELF_WORD_BYTES; + riscv_elf_append_rela (output_bfd, htab->elf.srelgot, &outrel); + } + } + else + { + /* If we are not emitting relocations for a + general dynamic reference, then we must be in a + static link or an executable link with the + symbol binding locally. Mark it as belonging + to module 1, the executable. */ + bfd_put_NN (output_bfd, 1, + htab->elf.sgot->contents + off); + bfd_put_NN (output_bfd, + dtpoff (info, relocation), + (htab->elf.sgot->contents + off + + RISCV_ELF_WORD_BYTES)); + } + } + + if (tls_type & GOT_TLS_IE) + { + if (need_relocs) + { + bfd_put_NN (output_bfd, 0, + htab->elf.sgot->contents + off + ie_off); + outrel.r_offset = sec_addr (htab->elf.sgot) + + off + ie_off; + outrel.r_addend = 0; + if (indx == 0) + outrel.r_addend = tpoff (info, relocation); + outrel.r_info = ELFNN_R_INFO (indx, R_RISCV_TLS_TPRELNN); + riscv_elf_append_rela (output_bfd, htab->elf.srelgot, &outrel); + } + else + { + bfd_put_NN (output_bfd, tpoff (info, relocation), + htab->elf.sgot->contents + off + ie_off); + } + } + } + + BFD_ASSERT (off < (bfd_vma) -2); + relocation = sec_addr (htab->elf.sgot) + off + (is_ie ? ie_off : 0); + if (!riscv_record_pcrel_hi_reloc (&pcrel_relocs, pc, relocation)) + r = bfd_reloc_overflow; + unresolved_reloc = FALSE; + break; + + default: + r = bfd_reloc_notsupported; + } + + /* Dynamic relocs are not propagated for SEC_DEBUGGING sections + because such sections are not SEC_ALLOC and thus ld.so will + not process them. */ + if (unresolved_reloc + && !((input_section->flags & SEC_DEBUGGING) != 0 + && h->def_dynamic) + && _bfd_elf_section_offset (output_bfd, info, input_section, + rel->r_offset) != (bfd_vma) -1) + { + (*_bfd_error_handler) + (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"), + input_bfd, + input_section, + (long) rel->r_offset, + howto->name, + h->root.root.string); + continue; + } + + if (r == bfd_reloc_ok) + r = perform_relocation (howto, rel, relocation, input_section, + input_bfd, contents); + + switch (r) + { + case bfd_reloc_ok: + continue; + + case bfd_reloc_overflow: + info->callbacks->reloc_overflow + (info, (h ? &h->root : NULL), name, howto->name, + (bfd_vma) 0, input_bfd, input_section, rel->r_offset); + break; + + case bfd_reloc_undefined: + info->callbacks->undefined_symbol + (info, name, input_bfd, input_section, rel->r_offset, + TRUE); + break; + + case bfd_reloc_outofrange: + msg = _("internal error: out of range error"); + break; + + case bfd_reloc_notsupported: + msg = _("internal error: unsupported relocation error"); + break; + + case bfd_reloc_dangerous: + msg = _("internal error: dangerous relocation"); + break; + + default: + msg = _("internal error: unknown error"); + break; + } + + if (msg) + info->callbacks->warning + (info, msg, name, input_bfd, input_section, rel->r_offset); + goto out; + } + + ret = riscv_resolve_pcrel_lo_relocs (&pcrel_relocs); +out: + riscv_free_pcrel_relocs (&pcrel_relocs); + return ret; +} + +/* Finish up dynamic symbol handling. We set the contents of various + dynamic sections here. */ + +static bfd_boolean +riscv_elf_finish_dynamic_symbol (bfd *output_bfd, + struct bfd_link_info *info, + struct elf_link_hash_entry *h, + Elf_Internal_Sym *sym) +{ + struct riscv_elf_link_hash_table *htab = riscv_elf_hash_table (info); + const struct elf_backend_data *bed = get_elf_backend_data (output_bfd); + + if (h->plt.offset != (bfd_vma) -1) + { + /* We've decided to create a PLT entry for this symbol. */ + bfd_byte *loc; + bfd_vma i, header_address, plt_idx, got_address; + uint32_t plt_entry[PLT_ENTRY_INSNS]; + Elf_Internal_Rela rela; + + BFD_ASSERT (h->dynindx != -1); + + /* Calculate the address of the PLT header. */ + header_address = sec_addr (htab->elf.splt); + + /* Calculate the index of the entry. */ + plt_idx = (h->plt.offset - PLT_HEADER_SIZE) / PLT_ENTRY_SIZE; + + /* Calculate the address of the .got.plt entry. */ + got_address = riscv_elf_got_plt_val (plt_idx, info); + + /* Find out where the .plt entry should go. */ + loc = htab->elf.splt->contents + h->plt.offset; + + /* Fill in the PLT entry itself. */ + riscv_make_plt_entry (got_address, header_address + h->plt.offset, + plt_entry); + for (i = 0; i < PLT_ENTRY_INSNS; i++) + bfd_put_32 (output_bfd, plt_entry[i], loc + 4*i); + + /* Fill in the initial value of the .got.plt entry. */ + loc = htab->elf.sgotplt->contents + + (got_address - sec_addr (htab->elf.sgotplt)); + bfd_put_NN (output_bfd, sec_addr (htab->elf.splt), loc); + + /* Fill in the entry in the .rela.plt section. */ + rela.r_offset = got_address; + rela.r_addend = 0; + rela.r_info = ELFNN_R_INFO (h->dynindx, R_RISCV_JUMP_SLOT); + + loc = htab->elf.srelplt->contents + plt_idx * sizeof (ElfNN_External_Rela); + bed->s->swap_reloca_out (output_bfd, &rela, loc); + + if (!h->def_regular) + { + /* Mark the symbol as undefined, rather than as defined in + the .plt section. Leave the value alone. */ + sym->st_shndx = SHN_UNDEF; + /* If the symbol is weak, we do need to clear the value. + Otherwise, the PLT entry would provide a definition for + the symbol even if the symbol wasn't defined anywhere, + and so the symbol would never be NULL. */ + if (!h->ref_regular_nonweak) + sym->st_value = 0; + } + } + + if (h->got.offset != (bfd_vma) -1 + && !(riscv_elf_hash_entry(h)->tls_type & (GOT_TLS_GD | GOT_TLS_IE))) + { + asection *sgot; + asection *srela; + Elf_Internal_Rela rela; + + /* This symbol has an entry in the GOT. Set it up. */ + + sgot = htab->elf.sgot; + srela = htab->elf.srelgot; + BFD_ASSERT (sgot != NULL && srela != NULL); + + rela.r_offset = sec_addr (sgot) + (h->got.offset &~ (bfd_vma) 1); + + /* If this is a -Bsymbolic link, and the symbol is defined + locally, we just want to emit a RELATIVE reloc. Likewise if + the symbol was forced to be local because of a version file. + The entry in the global offset table will already have been + initialized in the relocate_section function. */ + if (bfd_link_pic (info) + && (info->symbolic || h->dynindx == -1) + && h->def_regular) + { + asection *sec = h->root.u.def.section; + rela.r_info = ELFNN_R_INFO (0, R_RISCV_RELATIVE); + rela.r_addend = (h->root.u.def.value + + sec->output_section->vma + + sec->output_offset); + } + else + { + BFD_ASSERT (h->dynindx != -1); + rela.r_info = ELFNN_R_INFO (h->dynindx, R_RISCV_NN); + rela.r_addend = 0; + } + + bfd_put_NN (output_bfd, 0, + sgot->contents + (h->got.offset & ~(bfd_vma) 1)); + riscv_elf_append_rela (output_bfd, srela, &rela); + } + + if (h->needs_copy) + { + Elf_Internal_Rela rela; + + /* This symbols needs a copy reloc. Set it up. */ + BFD_ASSERT (h->dynindx != -1); + + rela.r_offset = sec_addr (h->root.u.def.section) + h->root.u.def.value; + rela.r_info = ELFNN_R_INFO (h->dynindx, R_RISCV_COPY); + rela.r_addend = 0; + riscv_elf_append_rela (output_bfd, htab->srelbss, &rela); + } + + /* Mark some specially defined symbols as absolute. */ + if (h == htab->elf.hdynamic + || (h == htab->elf.hgot || h == htab->elf.hplt)) + sym->st_shndx = SHN_ABS; + + return TRUE; +} + +/* Finish up the dynamic sections. */ + +static bfd_boolean +riscv_finish_dyn (bfd *output_bfd, struct bfd_link_info *info, + bfd *dynobj, asection *sdyn) +{ + struct riscv_elf_link_hash_table *htab = riscv_elf_hash_table (info); + const struct elf_backend_data *bed = get_elf_backend_data (output_bfd); + size_t dynsize = bed->s->sizeof_dyn; + bfd_byte *dyncon, *dynconend; + + dynconend = sdyn->contents + sdyn->size; + for (dyncon = sdyn->contents; dyncon < dynconend; dyncon += dynsize) + { + Elf_Internal_Dyn dyn; + asection *s; + + bed->s->swap_dyn_in (dynobj, dyncon, &dyn); + + switch (dyn.d_tag) + { + case DT_PLTGOT: + s = htab->elf.sgotplt; + dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; + break; + case DT_JMPREL: + s = htab->elf.srelplt; + dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; + break; + case DT_PLTRELSZ: + s = htab->elf.srelplt; + dyn.d_un.d_val = s->size; + break; + default: + continue; + } + + bed->s->swap_dyn_out (output_bfd, &dyn, dyncon); + } + return TRUE; +} + +static bfd_boolean +riscv_elf_finish_dynamic_sections (bfd *output_bfd, + struct bfd_link_info *info) +{ + bfd *dynobj; + asection *sdyn; + struct riscv_elf_link_hash_table *htab; + + htab = riscv_elf_hash_table (info); + BFD_ASSERT (htab != NULL); + dynobj = htab->elf.dynobj; + + sdyn = bfd_get_linker_section (dynobj, ".dynamic"); + + if (elf_hash_table (info)->dynamic_sections_created) + { + asection *splt; + bfd_boolean ret; + + splt = htab->elf.splt; + BFD_ASSERT (splt != NULL && sdyn != NULL); + + ret = riscv_finish_dyn (output_bfd, info, dynobj, sdyn); + + if (ret != TRUE) + return ret; + + /* Fill in the head and tail entries in the procedure linkage table. */ + if (splt->size > 0) + { + int i; + uint32_t plt_header[PLT_HEADER_INSNS]; + riscv_make_plt_header (sec_addr (htab->elf.sgotplt), + sec_addr (splt), plt_header); + + for (i = 0; i < PLT_HEADER_INSNS; i++) + bfd_put_32 (output_bfd, plt_header[i], splt->contents + 4*i); + } + + elf_section_data (splt->output_section)->this_hdr.sh_entsize + = PLT_ENTRY_SIZE; + } + + if (htab->elf.sgotplt) + { + asection *output_section = htab->elf.sgotplt->output_section; + + if (bfd_is_abs_section (output_section)) + { + (*_bfd_error_handler) + (_("discarded output section: `%A'"), htab->elf.sgotplt); + return FALSE; + } + + if (htab->elf.sgotplt->size > 0) + { + /* Write the first two entries in .got.plt, needed for the dynamic + linker. */ + bfd_put_NN (output_bfd, (bfd_vma) -1, htab->elf.sgotplt->contents); + bfd_put_NN (output_bfd, (bfd_vma) 0, + htab->elf.sgotplt->contents + GOT_ENTRY_SIZE); + } + + elf_section_data (output_section)->this_hdr.sh_entsize = GOT_ENTRY_SIZE; + } + + if (htab->elf.sgot) + { + asection *output_section = htab->elf.sgot->output_section; + + if (htab->elf.sgot->size > 0) + { + /* Set the first entry in the global offset table to the address of + the dynamic section. */ + bfd_vma val = sdyn ? sec_addr (sdyn) : 0; + bfd_put_NN (output_bfd, val, htab->elf.sgot->contents); + } + + elf_section_data (output_section)->this_hdr.sh_entsize = GOT_ENTRY_SIZE; + } + + return TRUE; +} + +/* Return address for Ith PLT stub in section PLT, for relocation REL + or (bfd_vma) -1 if it should not be included. */ + +static bfd_vma +riscv_elf_plt_sym_val (bfd_vma i, const asection *plt, + const arelent *rel ATTRIBUTE_UNUSED) +{ + return plt->vma + PLT_HEADER_SIZE + i * PLT_ENTRY_SIZE; +} + +static enum elf_reloc_type_class +riscv_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED, + const asection *rel_sec ATTRIBUTE_UNUSED, + const Elf_Internal_Rela *rela) +{ + switch (ELFNN_R_TYPE (rela->r_info)) + { + case R_RISCV_RELATIVE: + return reloc_class_relative; + case R_RISCV_JUMP_SLOT: + return reloc_class_plt; + case R_RISCV_COPY: + return reloc_class_copy; + default: + return reloc_class_normal; + } +} + +/* Merge backend specific data from an object file to the output + object file when linking. */ + +static bfd_boolean +_bfd_riscv_elf_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info) +{ + bfd *obfd = info->output_bfd; + flagword new_flags = elf_elfheader (ibfd)->e_flags; + flagword old_flags = elf_elfheader (obfd)->e_flags; + + if (!is_riscv_elf (ibfd) || !is_riscv_elf (obfd)) + return TRUE; + + if (strcmp (bfd_get_target (ibfd), bfd_get_target (obfd)) != 0) + { + (*_bfd_error_handler) + (_("%B: ABI is incompatible with that of the selected emulation"), + ibfd); + return FALSE; + } + + if (!_bfd_elf_merge_object_attributes (ibfd, info)) + return FALSE; + + if (! elf_flags_init (obfd)) + { + elf_flags_init (obfd) = TRUE; + elf_elfheader (obfd)->e_flags = new_flags; + return TRUE; + } + + /* Disallow linking soft-float and hard-float. */ + if ((old_flags ^ new_flags) & EF_RISCV_SOFT_FLOAT) + { + (*_bfd_error_handler) + (_("%B: can't link hard-float modules with soft-float modules"), ibfd); + goto fail; + } + + /* Allow linking RVC and non-RVC, and keep the RVC flag. */ + elf_elfheader (obfd)->e_flags |= new_flags & EF_RISCV_RVC; + + return TRUE; + +fail: + bfd_set_error (bfd_error_bad_value); + return FALSE; +} + +/* Delete some bytes from a section while relaxing. */ + +static bfd_boolean +riscv_relax_delete_bytes (bfd *abfd, asection *sec, bfd_vma addr, size_t count) +{ + unsigned int i, symcount; + bfd_vma toaddr = sec->size; + struct elf_link_hash_entry **sym_hashes = elf_sym_hashes (abfd); + Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr; + unsigned int sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec); + struct bfd_elf_section_data *data = elf_section_data (sec); + bfd_byte *contents = data->this_hdr.contents; + + /* Actually delete the bytes. */ + sec->size -= count; + memmove (contents + addr, contents + addr + count, toaddr - addr - count); + + /* Adjust the location of all of the relocs. Note that we need not + adjust the addends, since all PC-relative references must be against + symbols, which we will adjust below. */ + for (i = 0; i < sec->reloc_count; i++) + if (data->relocs[i].r_offset > addr && data->relocs[i].r_offset < toaddr) + data->relocs[i].r_offset -= count; + + /* Adjust the local symbols defined in this section. */ + for (i = 0; i < symtab_hdr->sh_info; i++) + { + Elf_Internal_Sym *sym = (Elf_Internal_Sym *) symtab_hdr->contents + i; + if (sym->st_shndx == sec_shndx) + { + /* If the symbol is in the range of memory we just moved, we + have to adjust its value. */ + if (sym->st_value > addr && sym->st_value <= toaddr) + sym->st_value -= count; + + /* If the symbol *spans* the bytes we just deleted (i.e. its + *end* is in the moved bytes but its *start* isn't), then we + must adjust its size. */ + if (sym->st_value <= addr + && sym->st_value + sym->st_size > addr + && sym->st_value + sym->st_size <= toaddr) + sym->st_size -= count; + } + } + + /* Now adjust the global symbols defined in this section. */ + symcount = ((symtab_hdr->sh_size / sizeof (ElfNN_External_Sym)) + - symtab_hdr->sh_info); + + for (i = 0; i < symcount; i++) + { + struct elf_link_hash_entry *sym_hash = sym_hashes[i]; + + if ((sym_hash->root.type == bfd_link_hash_defined + || sym_hash->root.type == bfd_link_hash_defweak) + && sym_hash->root.u.def.section == sec) + { + /* As above, adjust the value if needed. */ + if (sym_hash->root.u.def.value > addr + && sym_hash->root.u.def.value <= toaddr) + sym_hash->root.u.def.value -= count; + + /* As above, adjust the size if needed. */ + if (sym_hash->root.u.def.value <= addr + && sym_hash->root.u.def.value + sym_hash->size > addr + && sym_hash->root.u.def.value + sym_hash->size <= toaddr) + sym_hash->size -= count; + } + } + + return TRUE; +} + +/* Relax AUIPC + JALR into JAL. */ + +static bfd_boolean +_bfd_riscv_relax_call (bfd *abfd, asection *sec, asection *sym_sec, + struct bfd_link_info *link_info, + Elf_Internal_Rela *rel, + bfd_vma symval, + unsigned int max_alignment, + bfd_boolean *again) +{ + bfd_byte *contents = elf_section_data (sec)->this_hdr.contents; + bfd_signed_vma foff = symval - (sec_addr (sec) + rel->r_offset); + bfd_boolean near_zero = (symval + RISCV_IMM_REACH/2) < RISCV_IMM_REACH; + bfd_vma auipc, jalr; + int rd, r_type, len = 4, rvc = elf_elfheader (abfd)->e_flags & EF_RISCV_RVC; + + /* If the call crosses section boundaries, an alignment directive could + cause the PC-relative offset to later increase. */ + if (VALID_UJTYPE_IMM (foff) && sym_sec->output_section != sec->output_section) + foff += (foff < 0 ? -max_alignment : max_alignment); + + /* See if this function call can be shortened. */ + if (!VALID_UJTYPE_IMM (foff) && !(!bfd_link_pic (link_info) && near_zero)) + return TRUE; + + /* Shorten the function call. */ + BFD_ASSERT (rel->r_offset + 8 <= sec->size); + + auipc = bfd_get_32 (abfd, contents + rel->r_offset); + jalr = bfd_get_32 (abfd, contents + rel->r_offset + 4); + rd = (jalr >> OP_SH_RD) & OP_MASK_RD; + rvc = rvc && VALID_RVC_J_IMM (foff) && ARCH_SIZE == 32; + + if (rvc && (rd == 0 || rd == X_RA)) + { + /* Relax to C.J[AL] rd, addr. */ + r_type = R_RISCV_RVC_JUMP; + auipc = rd == 0 ? MATCH_C_J : MATCH_C_JAL; + len = 2; + } + else if (VALID_UJTYPE_IMM (foff)) + { + /* Relax to JAL rd, addr. */ + r_type = R_RISCV_JAL; + auipc = MATCH_JAL | (rd << OP_SH_RD); + } + else /* near_zero */ + { + /* Relax to JALR rd, x0, addr. */ + r_type = R_RISCV_LO12_I; + auipc = MATCH_JALR | (rd << OP_SH_RD); + } + + /* Replace the R_RISCV_CALL reloc. */ + rel->r_info = ELFNN_R_INFO (ELFNN_R_SYM (rel->r_info), r_type); + /* Replace the AUIPC. */ + bfd_put (8 * len, abfd, auipc, contents + rel->r_offset); + + /* Delete unnecessary JALR. */ + *again = TRUE; + return riscv_relax_delete_bytes (abfd, sec, rel->r_offset + len, 8 - len); +} + +/* Traverse all output sections and return the max alignment. */ + +static unsigned int +_bfd_riscv_get_max_alignment (asection *sec) +{ + unsigned int max_alignment_power = 0; + asection *o; + + for (o = sec->output_section->owner->sections; o != NULL; o = o->next) + { + if (o->alignment_power > max_alignment_power) + max_alignment_power = o->alignment_power; + } + + return 1 << max_alignment_power; +} + +/* Relax non-PIC global variable references. */ + +static bfd_boolean +_bfd_riscv_relax_lui (bfd *abfd, + asection *sec, + asection *sym_sec, + struct bfd_link_info *link_info, + Elf_Internal_Rela *rel, + bfd_vma symval, + unsigned int max_alignment, + bfd_boolean *again) +{ + bfd_byte *contents = elf_section_data (sec)->this_hdr.contents; + bfd_vma gp = riscv_global_pointer_value (link_info); + int use_rvc = elf_elfheader (abfd)->e_flags & EF_RISCV_RVC; + + /* Mergeable symbols and code might later move out of range. */ + if (sym_sec->flags & (SEC_MERGE | SEC_CODE)) + return TRUE; + + BFD_ASSERT (rel->r_offset + 4 <= sec->size); + + /* Is the reference in range of x0 or gp? + Valid gp range conservatively because of alignment issue. */ + if (VALID_ITYPE_IMM (symval) + || (symval >= gp && VALID_ITYPE_IMM (symval - gp + max_alignment)) + || (symval < gp && VALID_ITYPE_IMM (symval - gp - max_alignment))) + { + unsigned sym = ELFNN_R_SYM (rel->r_info); + switch (ELFNN_R_TYPE (rel->r_info)) + { + case R_RISCV_LO12_I: + rel->r_info = ELFNN_R_INFO (sym, R_RISCV_GPREL_I); + return TRUE; + + case R_RISCV_LO12_S: + rel->r_info = ELFNN_R_INFO (sym, R_RISCV_GPREL_S); + return TRUE; + + case R_RISCV_HI20: + /* We can delete the unnecessary LUI and reloc. */ + rel->r_info = ELFNN_R_INFO (0, R_RISCV_NONE); + *again = TRUE; + return riscv_relax_delete_bytes (abfd, sec, rel->r_offset, 4); + + default: + abort (); + } + } + + /* Can we relax LUI to C.LUI? Alignment might move the section forward; + account for this assuming page alignment at worst. */ + if (use_rvc + && ELFNN_R_TYPE (rel->r_info) == R_RISCV_HI20 + && VALID_RVC_LUI_IMM (RISCV_CONST_HIGH_PART (symval)) + && VALID_RVC_LUI_IMM (RISCV_CONST_HIGH_PART (symval + ELF_MAXPAGESIZE))) + { + /* Replace LUI with C.LUI if legal (i.e., rd != x2/sp). */ + bfd_vma lui = bfd_get_32 (abfd, contents + rel->r_offset); + if (((lui >> OP_SH_RD) & OP_MASK_RD) == X_SP) + return TRUE; + + lui = (lui & (OP_MASK_RD << OP_SH_RD)) | MATCH_C_LUI; + bfd_put_32 (abfd, lui, contents + rel->r_offset); + + /* Replace the R_RISCV_HI20 reloc. */ + rel->r_info = ELFNN_R_INFO (ELFNN_R_SYM (rel->r_info), R_RISCV_RVC_LUI); + + *again = TRUE; + return riscv_relax_delete_bytes (abfd, sec, rel->r_offset + 2, 2); + } + + return TRUE; +} + +/* Relax non-PIC TLS references. */ + +static bfd_boolean +_bfd_riscv_relax_tls_le (bfd *abfd, + asection *sec, + asection *sym_sec ATTRIBUTE_UNUSED, + struct bfd_link_info *link_info, + Elf_Internal_Rela *rel, + bfd_vma symval, + unsigned int max_alignment ATTRIBUTE_UNUSED, + bfd_boolean *again) +{ + /* See if this symbol is in range of tp. */ + if (RISCV_CONST_HIGH_PART (tpoff (link_info, symval)) != 0) + return TRUE; + + /* We can delete the unnecessary LUI and tp add. The LO12 reloc will be + made directly tp-relative. */ + BFD_ASSERT (rel->r_offset + 4 <= sec->size); + rel->r_info = ELFNN_R_INFO (0, R_RISCV_NONE); + + *again = TRUE; + return riscv_relax_delete_bytes (abfd, sec, rel->r_offset, 4); +} + +/* Implement R_RISCV_ALIGN by deleting excess alignment NOPs. */ + +static bfd_boolean +_bfd_riscv_relax_align (bfd *abfd, asection *sec, + asection *sym_sec ATTRIBUTE_UNUSED, + struct bfd_link_info *link_info ATTRIBUTE_UNUSED, + Elf_Internal_Rela *rel, + bfd_vma symval, + unsigned int max_alignment ATTRIBUTE_UNUSED, + bfd_boolean *again ATTRIBUTE_UNUSED) +{ + bfd_byte *contents = elf_section_data (sec)->this_hdr.contents; + bfd_vma alignment = 1, pos; + while (alignment <= rel->r_addend) + alignment *= 2; + + symval -= rel->r_addend; + bfd_vma aligned_addr = ((symval - 1) & ~(alignment - 1)) + alignment; + bfd_vma nop_bytes = aligned_addr - symval; + + /* Once we've handled an R_RISCV_ALIGN, we can't relax anything else. */ + sec->sec_flg0 = TRUE; + + /* Make sure there are enough NOPs to actually achieve the alignment. */ + if (rel->r_addend < nop_bytes) + return FALSE; + + /* Delete the reloc. */ + rel->r_info = ELFNN_R_INFO (0, R_RISCV_NONE); + + /* If the number of NOPs is already correct, there's nothing to do. */ + if (nop_bytes == rel->r_addend) + return TRUE; + + /* Write as many RISC-V NOPs as we need. */ + for (pos = 0; pos < (nop_bytes & -4); pos += 4) + bfd_put_32 (abfd, RISCV_NOP, contents + rel->r_offset + pos); + + /* Write a final RVC NOP if need be. */ + if (nop_bytes % 4 != 0) + bfd_put_16 (abfd, RVC_NOP, contents + rel->r_offset + pos); + + /* Delete the excess bytes. */ + return riscv_relax_delete_bytes (abfd, sec, rel->r_offset + nop_bytes, + rel->r_addend - nop_bytes); +} + +/* Relax a section. Pass 0 shortens code sequences unless disabled. + Pass 1, which cannot be disabled, handles code alignment directives. */ + +static bfd_boolean +_bfd_riscv_relax_section (bfd *abfd, asection *sec, + struct bfd_link_info *info, + bfd_boolean *again) +{ + Elf_Internal_Shdr *symtab_hdr = &elf_symtab_hdr (abfd); + struct riscv_elf_link_hash_table *htab = riscv_elf_hash_table (info); + struct bfd_elf_section_data *data = elf_section_data (sec); + Elf_Internal_Rela *relocs; + bfd_boolean ret = FALSE; + unsigned int i; + unsigned int max_alignment; + + *again = FALSE; + + if (bfd_link_relocatable (info) + || sec->sec_flg0 + || (sec->flags & SEC_RELOC) == 0 + || sec->reloc_count == 0 + || (info->disable_target_specific_optimizations + && info->relax_pass == 0)) + return TRUE; + + /* Read this BFD's relocs if we haven't done so already. */ + if (data->relocs) + relocs = data->relocs; + else if (!(relocs = _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL, + info->keep_memory))) + goto fail; + + max_alignment = _bfd_riscv_get_max_alignment (sec); + + /* Examine and consider relaxing each reloc. */ + for (i = 0; i < sec->reloc_count; i++) + { + asection *sym_sec; + Elf_Internal_Rela *rel = relocs + i; + typeof (&_bfd_riscv_relax_call) relax_func = NULL; + int type = ELFNN_R_TYPE (rel->r_info); + bfd_vma symval; + + if (info->relax_pass == 0) + { + if (type == R_RISCV_CALL || type == R_RISCV_CALL_PLT) + relax_func = _bfd_riscv_relax_call; + else if (type == R_RISCV_HI20 + || type == R_RISCV_LO12_I + || type == R_RISCV_LO12_S) + relax_func = _bfd_riscv_relax_lui; + else if (type == R_RISCV_TPREL_HI20 || type == R_RISCV_TPREL_ADD) + relax_func = _bfd_riscv_relax_tls_le; + } + else if (type == R_RISCV_ALIGN) + relax_func = _bfd_riscv_relax_align; + + if (!relax_func) + continue; + + data->relocs = relocs; + + /* Read this BFD's contents if we haven't done so already. */ + if (!data->this_hdr.contents + && !bfd_malloc_and_get_section (abfd, sec, &data->this_hdr.contents)) + goto fail; + + /* Read this BFD's symbols if we haven't done so already. */ + if (symtab_hdr->sh_info != 0 + && !symtab_hdr->contents + && !(symtab_hdr->contents = + (unsigned char *) bfd_elf_get_elf_syms (abfd, symtab_hdr, + symtab_hdr->sh_info, + 0, NULL, NULL, NULL))) + goto fail; + + /* Get the value of the symbol referred to by the reloc. */ + if (ELFNN_R_SYM (rel->r_info) < symtab_hdr->sh_info) + { + /* A local symbol. */ + Elf_Internal_Sym *isym = ((Elf_Internal_Sym *) symtab_hdr->contents + + ELFNN_R_SYM (rel->r_info)); + + if (isym->st_shndx == SHN_UNDEF) + sym_sec = sec, symval = sec_addr (sec) + rel->r_offset; + else + { + BFD_ASSERT (isym->st_shndx < elf_numsections (abfd)); + sym_sec = elf_elfsections (abfd)[isym->st_shndx]->bfd_section; + if (sec_addr (sym_sec) == 0) + continue; + symval = sec_addr (sym_sec) + isym->st_value; + } + } + else + { + unsigned long indx; + struct elf_link_hash_entry *h; + + indx = ELFNN_R_SYM (rel->r_info) - symtab_hdr->sh_info; + h = elf_sym_hashes (abfd)[indx]; + + while (h->root.type == bfd_link_hash_indirect + || h->root.type == bfd_link_hash_warning) + h = (struct elf_link_hash_entry *) h->root.u.i.link; + + if (h->plt.offset != MINUS_ONE) + symval = sec_addr (htab->elf.splt) + h->plt.offset; + else if (h->root.u.def.section->output_section == NULL + || (h->root.type != bfd_link_hash_defined + && h->root.type != bfd_link_hash_defweak)) + continue; + else + symval = sec_addr (h->root.u.def.section) + h->root.u.def.value; + + sym_sec = h->root.u.def.section; + } + + symval += rel->r_addend; + + if (!relax_func (abfd, sec, sym_sec, info, rel, symval, + max_alignment, again)) + goto fail; + } + + ret = TRUE; + +fail: + if (relocs != data->relocs) + free (relocs); + + return ret; +} + +#if ARCH_SIZE == 32 +# define PRSTATUS_SIZE 0 /* FIXME */ +# define PRSTATUS_OFFSET_PR_CURSIG 12 +# define PRSTATUS_OFFSET_PR_PID 24 +# define PRSTATUS_OFFSET_PR_REG 72 +# define ELF_GREGSET_T_SIZE 128 +# define PRPSINFO_SIZE 128 +# define PRPSINFO_OFFSET_PR_PID 16 +# define PRPSINFO_OFFSET_PR_FNAME 32 +# define PRPSINFO_OFFSET_PR_PSARGS 48 +#else +# define PRSTATUS_SIZE 376 +# define PRSTATUS_OFFSET_PR_CURSIG 12 +# define PRSTATUS_OFFSET_PR_PID 32 +# define PRSTATUS_OFFSET_PR_REG 112 +# define ELF_GREGSET_T_SIZE 256 +# define PRPSINFO_SIZE 136 +# define PRPSINFO_OFFSET_PR_PID 24 +# define PRPSINFO_OFFSET_PR_FNAME 40 +# define PRPSINFO_OFFSET_PR_PSARGS 56 +#endif + +/* Support for core dump NOTE sections. */ + +static bfd_boolean +riscv_elf_grok_prstatus (bfd *abfd, Elf_Internal_Note *note) +{ + switch (note->descsz) + { + default: + return FALSE; + + case PRSTATUS_SIZE: /* sizeof(struct elf_prstatus) on Linux/RISC-V. */ + /* pr_cursig */ + elf_tdata (abfd)->core->signal + = bfd_get_16 (abfd, note->descdata + PRSTATUS_OFFSET_PR_CURSIG); + + /* pr_pid */ + elf_tdata (abfd)->core->lwpid + = bfd_get_32 (abfd, note->descdata + PRSTATUS_OFFSET_PR_PID); + break; + } + + /* Make a ".reg/999" section. */ + return _bfd_elfcore_make_pseudosection (abfd, ".reg", ELF_GREGSET_T_SIZE, + note->descpos + PRSTATUS_OFFSET_PR_REG); +} + +static bfd_boolean +riscv_elf_grok_psinfo (bfd *abfd, Elf_Internal_Note *note) +{ + switch (note->descsz) + { + default: + return FALSE; + + case PRPSINFO_SIZE: /* sizeof(struct elf_prpsinfo) on Linux/RISC-V. */ + /* pr_pid */ + elf_tdata (abfd)->core->pid + = bfd_get_32 (abfd, note->descdata + PRPSINFO_OFFSET_PR_PID); + + /* pr_fname */ + elf_tdata (abfd)->core->program = _bfd_elfcore_strndup + (abfd, note->descdata + PRPSINFO_OFFSET_PR_FNAME, 16); + + /* pr_psargs */ + elf_tdata (abfd)->core->command = _bfd_elfcore_strndup + (abfd, note->descdata + PRPSINFO_OFFSET_PR_PSARGS, 80); + break; + } + + /* Note that for some reason, a spurious space is tacked + onto the end of the args in some (at least one anyway) + implementations, so strip it off if it exists. */ + + { + char *command = elf_tdata (abfd)->core->command; + int n = strlen (command); + + if (0 < n && command[n - 1] == ' ') + command[n - 1] = '\0'; + } + + return TRUE; +} + + +#define TARGET_LITTLE_SYM riscv_elfNN_vec +#define TARGET_LITTLE_NAME "elfNN-littleriscv" + +#define elf_backend_reloc_type_class riscv_reloc_type_class + +#define bfd_elfNN_bfd_reloc_name_lookup riscv_reloc_name_lookup +#define bfd_elfNN_bfd_link_hash_table_create riscv_elf_link_hash_table_create +#define bfd_elfNN_bfd_reloc_type_lookup riscv_reloc_type_lookup +#define bfd_elfNN_bfd_merge_private_bfd_data \ + _bfd_riscv_elf_merge_private_bfd_data + +#define elf_backend_copy_indirect_symbol riscv_elf_copy_indirect_symbol +#define elf_backend_create_dynamic_sections riscv_elf_create_dynamic_sections +#define elf_backend_check_relocs riscv_elf_check_relocs +#define elf_backend_adjust_dynamic_symbol riscv_elf_adjust_dynamic_symbol +#define elf_backend_size_dynamic_sections riscv_elf_size_dynamic_sections +#define elf_backend_relocate_section riscv_elf_relocate_section +#define elf_backend_finish_dynamic_symbol riscv_elf_finish_dynamic_symbol +#define elf_backend_finish_dynamic_sections riscv_elf_finish_dynamic_sections +#define elf_backend_gc_mark_hook riscv_elf_gc_mark_hook +#define elf_backend_gc_sweep_hook riscv_elf_gc_sweep_hook +#define elf_backend_plt_sym_val riscv_elf_plt_sym_val +#define elf_backend_grok_prstatus riscv_elf_grok_prstatus +#define elf_backend_grok_psinfo riscv_elf_grok_psinfo +#define elf_info_to_howto_rel NULL +#define elf_info_to_howto riscv_info_to_howto_rela +#define bfd_elfNN_bfd_relax_section _bfd_riscv_relax_section + +#define elf_backend_init_index_section _bfd_elf_init_1_index_section + +#define elf_backend_can_gc_sections 1 +#define elf_backend_can_refcount 1 +#define elf_backend_want_got_plt 1 +#define elf_backend_plt_readonly 1 +#define elf_backend_plt_alignment 4 +#define elf_backend_want_plt_sym 1 +#define elf_backend_got_header_size (ARCH_SIZE / 8) +#define elf_backend_rela_normal 1 +#define elf_backend_default_execstack 0 + +#include "elfNN-target.h" |