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From f0c66bc13d177150c3055cf7c321e48d0eb58b12 Mon Sep 17 00:00:00 2001
From: Xi Ruoyao <[email protected]>
Date: Wed, 30 Oct 2024 18:32:50 +0800
Subject: [PATCH 098/123] LoongArch: Add DT_RELR support
The logic is same as a71d87680110 ("aarch64: Add DT_RELR support").
As LoongArch does not have -z dynamic-undefined-weak, we don't need to
consider UNDEFWEAK_NO_DYNAMIC_RELOC.
The linker relaxation adds another layer of complexity. When we delete
bytes in a section during relaxation, we need to fix up the offset in
the to-be-packed relative relocations against this section.
Signed-off-by: Xi Ruoyao <[email protected]>
---
bfd/elfnn-loongarch.c | 488 ++++++++++++++++++++-
binutils/testsuite/lib/binutils-common.exp | 3 +-
ld/emulparams/elf64loongarch.sh | 1 +
3 files changed, 487 insertions(+), 5 deletions(-)
diff --git a/bfd/elfnn-loongarch.c b/bfd/elfnn-loongarch.c
index 2bdd7be2..d11189b4 100644
--- a/bfd/elfnn-loongarch.c
+++ b/bfd/elfnn-loongarch.c
@@ -84,6 +84,12 @@ struct _bfd_loongarch_elf_obj_tdata
&& elf_tdata (bfd) != NULL \
&& elf_object_id (bfd) == LARCH_ELF_DATA)
+struct relr_entry
+{
+ asection *sec;
+ bfd_vma off;
+};
+
struct loongarch_elf_link_hash_table
{
struct elf_link_hash_table elf;
@@ -104,8 +110,51 @@ struct loongarch_elf_link_hash_table
/* The data segment phase, don't relax the section
when it is exp_seg_relro_adjust. */
int *data_segment_phase;
+
+ /* Array of relative relocs to be emitted in DT_RELR format. */
+ bfd_size_type relr_alloc;
+ bfd_size_type relr_count;
+ struct relr_entry *relr;
+
+ /* Sorted output addresses of above relative relocs. */
+ bfd_vma *relr_sorted;
+
+ /* Layout recomputation count. */
+ bfd_size_type relr_layout_iter;
+};
+
+struct loongarch_elf_section_data
+{
+ struct bfd_elf_section_data elf;
+
+ /* &htab->relr[i] where i is the smallest number s.t.
+ elf_section_data (htab->relr[i].sec) == &elf.
+ NULL if there exists no such i. */
+ struct relr_entry *relr;
};
+/* We need an additional field in elf_section_data to handle complex
+ interactions between DT_RELR and relaxation. */
+static bool
+loongarch_elf_new_section_hook (bfd *abfd, asection *sec)
+{
+ if (!sec->used_by_bfd)
+ {
+ struct loongarch_elf_section_data *sdata;
+ size_t amt = sizeof (*sdata);
+
+ sdata = bfd_zalloc (abfd, amt);
+ if (!sdata)
+ return false;
+ sec->used_by_bfd = sdata;
+ }
+
+ return _bfd_elf_new_section_hook (abfd, sec);
+}
+
+#define loongarch_elf_section_data(x) \
+ ((struct loongarch_elf_section_data *) elf_section_data (x))
+
/* Get the LoongArch ELF linker hash table from a link_info structure. */
#define loongarch_elf_hash_table(p) \
(elf_hash_table_id (elf_hash_table (p)) == LARCH_ELF_DATA \
@@ -927,6 +976,20 @@ loongarch_elf_check_relocs (bfd *abfd, struct bfd_link_info *info,
if (rel + 1 != relocs + sec->reloc_count
&& ELFNN_R_TYPE (rel[1].r_info) == R_LARCH_RELAX)
r_type = loongarch_tls_transition (abfd, info, h, r_symndx, r_type);
+
+ /* I don't want to spend time supporting DT_RELR with old object
+ files doing stack-based relocs. */
+ if (info->enable_dt_relr
+ && r_type >= R_LARCH_SOP_PUSH_PCREL
+ && r_type <= R_LARCH_SOP_POP_32_U)
+ {
+ /* xgettext:c-format */
+ _bfd_error_handler (_("%pB: stack based reloc type (%u) is not "
+ "supported with -z pack-relative-relocs"),
+ abfd, r_type);
+ return false;
+ }
+
switch (r_type)
{
case R_LARCH_GOT_PC_HI20:
@@ -1143,6 +1206,20 @@ loongarch_elf_check_relocs (bfd *abfd, struct bfd_link_info *info,
return false;
break;
+ case R_LARCH_ALIGN:
+ /* Check against irrational R_LARCH_ALIGN relocs which may cause
+ removing an odd number of bytes and disrupt DT_RELR. */
+ if (rel->r_offset % 4 != 0)
+ {
+ /* xgettext:c-format */
+ _bfd_error_handler (
+ _("%pB: R_LARCH_ALIGN with offset %" PRId64 " not aligned "
+ "to instruction boundary"),
+ abfd, (uint64_t) rel->r_offset);
+ return false;
+ }
+ break;
+
default:
break;
}
@@ -1857,6 +1934,343 @@ maybe_set_textrel (struct elf_link_hash_entry *h, void *info_p)
return true;
}
+static bool
+record_relr (struct loongarch_elf_link_hash_table *htab, asection *sec,
+ bfd_vma off, asection *sreloc)
+{
+ struct relr_entry **sec_relr = &loongarch_elf_section_data (sec)->relr;
+
+ /* Undo the relocation section size accounting. */
+ BFD_ASSERT (sreloc->size >= sizeof (ElfNN_External_Rela));
+ sreloc->size -= sizeof (ElfNN_External_Rela);
+
+ BFD_ASSERT (off % 2 == 0 && sec->alignment_power > 0);
+ if (htab->relr_count >= htab->relr_alloc)
+ {
+ if (htab->relr_alloc == 0)
+ htab->relr_alloc = 4096;
+ else
+ htab->relr_alloc *= 2;
+
+ htab->relr = bfd_realloc (htab->relr,
+ htab->relr_alloc * sizeof (*htab->relr));
+ if (!htab->relr)
+ return false;
+ }
+ htab->relr[htab->relr_count].sec = sec;
+ htab->relr[htab->relr_count].off = off;
+ if (*sec_relr == NULL)
+ *sec_relr = &htab->relr[htab->relr_count];
+ htab->relr_count++;
+ return true;
+}
+
+static bool
+record_relr_local_got_relocs (bfd *input_bfd, struct bfd_link_info *info)
+{
+ bfd_vma *local_got_offsets = elf_local_got_offsets (input_bfd);
+ char *local_tls_type = _bfd_loongarch_elf_local_got_tls_type (input_bfd);
+ Elf_Internal_Shdr *symtab_hdr = &elf_symtab_hdr (input_bfd);
+ struct loongarch_elf_link_hash_table *htab =
+ loongarch_elf_hash_table (info);
+
+ if (!local_got_offsets || !local_tls_type || !bfd_link_pic (info))
+ return true;
+
+ for (unsigned i = 0; i < symtab_hdr->sh_info; i++)
+ {
+ bfd_vma off = local_got_offsets[i];
+
+ /* FIXME: If the local symbol is in SHN_ABS then emitting
+ a relative relocation is not correct, but it seems to be wrong
+ in loongarch_elf_relocate_section too. */
+ if (local_tls_type[i] == GOT_NORMAL
+ && !record_relr (htab, htab->elf.sgot, off, htab->elf.srelgot))
+ return false;
+ }
+
+ return true;
+}
+
+static bool
+record_relr_dyn_got_relocs (struct elf_link_hash_entry *h, void *inf)
+{
+ struct bfd_link_info *info = (struct bfd_link_info *) inf;
+ struct loongarch_elf_link_hash_table *htab =
+ loongarch_elf_hash_table (info);
+
+ if (h->root.type == bfd_link_hash_indirect)
+ return true;
+ if (h->type == STT_GNU_IFUNC && h->def_regular)
+ return true;
+ if (h->got.refcount <= 0)
+ return true;
+ if (loongarch_elf_hash_entry (h)->tls_type
+ & (GOT_TLS_GD | GOT_TLS_IE | GOT_TLS_GDESC))
+ return true;
+ if (!bfd_link_pic (info))
+ return true;
+
+ /* On LoongArch a GOT entry for undefined weak symbol is never relocated
+ with R_LARCH_RELATIVE: we don't have -z dynamic-undefined-weak, thus
+ the GOT entry is either const 0 (if the symbol is LARCH_REF_LOCAL) or
+ relocated with R_LARCH_NN (otherwise). */
+ if (h->root.type == bfd_link_hash_undefweak)
+ return true;
+
+ if (!LARCH_REF_LOCAL (info, h))
+ return true;
+ if (bfd_is_abs_symbol (&h->root))
+ return true;
+
+ if (!record_relr (htab, htab->elf.sgot, h->got.offset,
+ htab->elf.srelgot))
+ return false;
+
+ return true;
+}
+
+static bool
+record_relr_non_got_relocs (bfd *input_bfd, struct bfd_link_info *info,
+ asection *sec)
+{
+ asection *sreloc;
+ struct loongarch_elf_link_hash_table *htab;
+ Elf_Internal_Rela *relocs, *rel, *rel_end;
+ Elf_Internal_Shdr *symtab_hdr;
+ struct elf_link_hash_entry **sym_hashes;
+
+ if (!bfd_link_pic (info))
+ return true;
+ if (sec->reloc_count == 0)
+ return true;
+ if ((sec->flags & (SEC_RELOC | SEC_ALLOC | SEC_DEBUGGING))
+ != (SEC_RELOC | SEC_ALLOC))
+ return true;
+ if (sec->alignment_power == 0)
+ return true;
+ if (discarded_section (sec))
+ return true;
+
+ sreloc = elf_section_data (sec)->sreloc;
+ if (sreloc == NULL)
+ return true;
+
+ htab = loongarch_elf_hash_table (info);
+ symtab_hdr = &elf_symtab_hdr (input_bfd);
+ sym_hashes = elf_sym_hashes (input_bfd);
+ relocs = _bfd_elf_link_info_read_relocs (input_bfd, info, sec, NULL,
+ NULL, info->keep_memory);
+ BFD_ASSERT (relocs != NULL);
+ rel_end = relocs + sec->reloc_count;
+ for (rel = relocs; rel < rel_end; rel++)
+ {
+ unsigned r_symndx = ELFNN_R_SYM (rel->r_info);
+ unsigned int r_type = ELFNN_R_TYPE (rel->r_info);
+ struct elf_link_hash_entry *h = NULL;
+ asection *def_sec = NULL;
+
+ if ((r_type != R_LARCH_64 && r_type != R_LARCH_32)
+ || rel->r_offset % 2 != 0)
+ continue;
+
+ /* The logical below must match loongarch_elf_relocate_section. */
+ if (r_symndx < symtab_hdr->sh_info)
+ {
+ /* A local symbol. */
+ Elf_Internal_Sym *isym;
+ isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache, input_bfd,
+ r_symndx);
+ BFD_ASSERT(isym != NULL);
+
+ /* Local STT_GNU_IFUNC symbol uses R_LARCH_IRELATIVE for
+ R_LARCH_NN, not R_LARCH_RELATIVE. */
+ if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
+ continue;
+ def_sec = bfd_section_from_elf_index (input_bfd, isym->st_shndx);
+ }
+ 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;
+
+ /* Filter out symbols that cannot have a relative reloc. */
+ if (h->dyn_relocs == NULL)
+ continue;
+ if (bfd_is_abs_symbol (&h->root))
+ continue;
+ if (h->type == STT_GNU_IFUNC)
+ continue;
+
+ if (h->root.type == bfd_link_hash_defined
+ || h->root.type == bfd_link_hash_defweak)
+ def_sec = h->root.u.def.section;
+
+ /* On LoongArch an R_LARCH_NN against undefined weak symbol
+ is never converted to R_LARCH_RELATIVE: we don't have
+ -z dynamic-undefined-weak, thus the reloc is either removed
+ (if the symbol is LARCH_REF_LOCAL) or kept (otherwise). */
+ if (h->root.type == bfd_link_hash_undefweak)
+ continue;
+
+ if (!LARCH_REF_LOCAL (info, h))
+ continue;
+ }
+
+ if (!def_sec || discarded_section (def_sec))
+ continue;
+
+ if (!record_relr (htab, sec, rel->r_offset, sreloc))
+ return false;
+ }
+
+ return true;
+}
+
+static int
+cmp_relr_addr (const void *p, const void *q)
+{
+ const bfd_vma *a = p, *b = q;
+ return (*a > *b) - (*a < *b);
+}
+
+static bool
+sort_relr (struct bfd_link_info *info,
+ struct loongarch_elf_link_hash_table *htab)
+{
+ if (htab->relr_count == 0)
+ return true;
+
+ bfd_vma *addr = htab->relr_sorted;
+ if (!addr)
+ {
+ addr = bfd_malloc (htab->relr_count * sizeof (*addr));
+ if (!addr)
+ return false;
+ htab->relr_sorted = addr;
+ }
+
+ for (bfd_size_type i = 0; i < htab->relr_count; i++)
+ {
+ bfd_vma off = _bfd_elf_section_offset (info->output_bfd, info,
+ htab->relr[i].sec,
+ htab->relr[i].off);
+ addr[i] = htab->relr[i].sec->output_section->vma
+ + htab->relr[i].sec->output_offset + off;
+ }
+ qsort(addr, htab->relr_count, sizeof (*addr), cmp_relr_addr);
+ return true;
+}
+
+static bool
+loongarch_elf_size_relative_relocs (struct bfd_link_info *info,
+ bool *need_layout)
+{
+ struct loongarch_elf_link_hash_table *htab =
+ loongarch_elf_hash_table (info);
+ asection *srelrdyn = htab->elf.srelrdyn;
+
+ *need_layout = false;
+
+ if (!sort_relr (info, htab))
+ return false;
+ bfd_vma *addr = htab->relr_sorted;
+
+ BFD_ASSERT (srelrdyn != NULL);
+ bfd_size_type oldsize = srelrdyn->size;
+ srelrdyn->size = 0;
+ for (bfd_size_type i = 0; i < htab->relr_count; )
+ {
+ bfd_vma base = addr[i];
+ i++;
+ srelrdyn->size += NN / 8;
+ base += NN / 8;
+ while (1)
+ {
+ bfd_size_type start_i = i;
+ while (i < htab->relr_count
+ && addr[i] - base < (NN - 1) * (NN / 8)
+ && (addr[i] - base) % (NN / 8) == 0)
+ i++;
+ if (i == start_i)
+ break;
+ srelrdyn->size += NN / 8;
+ base += (NN - 1) * (NN / 8);
+ }
+ }
+ if (srelrdyn->size != oldsize)
+ {
+ *need_layout = true;
+ /* Stop after a few iterations in case the layout does not converge,
+ but we can only stop when the size would shrink (and pad the
+ spare space with 1. */
+ if (htab->relr_layout_iter++ > 5 && srelrdyn->size < oldsize)
+ {
+ srelrdyn->size = oldsize;
+ *need_layout = false;
+ }
+ }
+ return true;
+}
+
+static bool
+loongarch_elf_finish_relative_relocs (struct bfd_link_info *info)
+{
+ struct loongarch_elf_link_hash_table *htab =
+ loongarch_elf_hash_table (info);
+ asection *srelrdyn = htab->elf.srelrdyn;
+ bfd *dynobj = htab->elf.dynobj;
+
+ if (!srelrdyn || srelrdyn->size == 0)
+ return true;
+
+ srelrdyn->contents = bfd_alloc (dynobj, srelrdyn->size);
+ if (!srelrdyn->contents)
+ return false;
+
+ bfd_vma *addr = htab->relr_sorted;
+ bfd_byte *loc = srelrdyn->contents;
+ for (bfd_size_type i = 0; i < htab->relr_count; )
+ {
+ bfd_vma base = addr[i];
+ i++;
+ bfd_put_NN (dynobj, base, loc);
+ loc += NN / 8;
+ base += NN / 8;
+ while (1)
+ {
+ uintNN_t bits = 0;
+ while (i < htab->relr_count)
+ {
+ bfd_vma delta = addr[i] - base;
+ if (delta >= (NN - 1) * (NN / 8) || delta % (NN / 8) != 0)
+ break;
+ bits |= (uintNN_t) 1 << (delta / (NN / 8));
+ i++;
+ }
+ if (bits == 0)
+ break;
+ bfd_put_NN (dynobj, (bits << 1) | 1, loc);
+ loc += NN / 8;
+ base += (NN - 1) * (NN / 8);
+ }
+ }
+
+ free (addr);
+ htab->relr_sorted = NULL;
+
+ /* Pad any excess with 1's, a do-nothing encoding. */
+ while (loc < srelrdyn->contents + srelrdyn->size)
+ {
+ bfd_put_NN (dynobj, 1, loc);
+ loc += NN / 8;
+ }
+
+ return true;
+}
+
static bool
loongarch_elf_size_dynamic_sections (bfd *output_bfd,
struct bfd_link_info *info)
@@ -2036,6 +2450,24 @@ loongarch_elf_size_dynamic_sections (bfd *output_bfd,
&& (htab->elf.splt == NULL || htab->elf.splt->size == 0))
htab->elf.sgotplt->size = 0;
+ if (info->enable_dt_relr && !bfd_link_relocatable (info))
+ {
+ elf_link_hash_traverse (&htab->elf, record_relr_dyn_got_relocs, info);
+
+ for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
+ {
+ if (!is_loongarch_elf (ibfd))
+ continue;
+
+ for (s = ibfd->sections; s != NULL; s = s->next)
+ if (!record_relr_non_got_relocs (ibfd, info, s))
+ return false;
+
+ if (!record_relr_local_got_relocs (ibfd, info))
+ return false;
+ }
+ }
+
/* The check_relocs and adjust_dynamic_symbol entry points have
determined the sizes of the various dynamic sections. Allocate
memory for them. */
@@ -2060,6 +2492,14 @@ loongarch_elf_size_dynamic_sections (bfd *output_bfd,
s->reloc_count = 0;
}
}
+ else if (s == htab->elf.srelrdyn && htab->relr_count == 0)
+ {
+ /* Remove .relr.dyn based on relr_count, not size, since
+ it is not sized yet. */
+ s->flags |= SEC_EXCLUDE;
+ /* Allocate contents later. */
+ continue;
+ }
else
{
/* It's not one of our sections. */
@@ -2976,7 +3416,21 @@ loongarch_elf_relocate_section (bfd *output_bfd, struct bfd_link_info *info,
if (unresolved_reloc
&& (ARCH_SIZE == 32 || r_type != R_LARCH_32)
&& !(h && (h->is_weakalias || !h->dyn_relocs)))
- loongarch_elf_append_rela (output_bfd, sreloc, &outrel);
+ {
+ if (info->enable_dt_relr
+ && (ELFNN_R_TYPE (outrel.r_info) == R_LARCH_RELATIVE)
+ && input_section->alignment_power != 0
+ && rel->r_offset % 2 == 0)
+ /* Don't emit a relative relocation that is packed,
+ only apply the addend (as if we are applying the
+ original R_LARCH_NN reloc in a PDE). */
+ r = perform_relocation (rel, input_section, howto,
+ relocation, input_bfd,
+ contents);
+ else
+ loongarch_elf_append_rela (output_bfd, sreloc,
+ &outrel);
+ }
}
relocation += rel->r_addend;
@@ -3700,7 +4154,7 @@ loongarch_elf_relocate_section (bfd *output_bfd, struct bfd_link_info *info,
got_off = local_got_offsets[r_symndx] & (~(bfd_vma)1);
if ((local_got_offsets[r_symndx] & 1) == 0)
{
- if (bfd_link_pic (info))
+ if (bfd_link_pic (info) && !info->enable_dt_relr)
{
Elf_Internal_Rela rela;
rela.r_offset = sec_addr (got) + got_off;
@@ -4112,6 +4566,13 @@ loongarch_relax_delete_bytes (bfd *abfd,
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;
+ struct relr_entry *relr = loongarch_elf_section_data (sec)->relr;
+ struct loongarch_elf_link_hash_table *htab =
+ loongarch_elf_hash_table (link_info);
+ struct relr_entry *relr_end = NULL;
+
+ if (htab->relr_count)
+ relr_end = htab->relr + htab->relr_count;
/* Actually delete the bytes. */
sec->size -= count;
@@ -4124,6 +4585,11 @@ loongarch_relax_delete_bytes (bfd *abfd,
if (data->relocs[i].r_offset > addr && data->relocs[i].r_offset < toaddr)
data->relocs[i].r_offset -= count;
+ /* Likewise for relative relocs to be packed into .relr. */
+ for (; relr && relr < relr_end && relr->sec == sec; relr++)
+ if (relr->off > addr && relr->off < toaddr)
+ relr->off -= count;
+
/* Adjust the local symbols defined in this section. */
for (i = 0; i < symtab_hdr->sh_info; i++)
{
@@ -5212,9 +5678,18 @@ loongarch_elf_finish_dynamic_symbol (bfd *output_bfd,
else if (bfd_link_pic (info) && LARCH_REF_LOCAL (info, h))
{
asection *sec = h->root.u.def.section;
+ bfd_vma linkaddr = h->root.u.def.value + sec->output_section->vma
+ + sec->output_offset;
+
+ /* Don't emit relative relocs if they are packed, but we need
+ to write the addend (link-time addr) into the GOT then. */
+ if (info->enable_dt_relr)
+ {
+ bfd_put_NN (output_bfd, linkaddr, sgot->contents + off);
+ goto skip_got_reloc;
+ }
rela.r_info = ELFNN_R_INFO (0, R_LARCH_RELATIVE);
- rela.r_addend = (h->root.u.def.value + sec->output_section->vma
- + sec->output_offset);
+ rela.r_addend = linkaddr;
}
else
{
@@ -5225,6 +5700,7 @@ loongarch_elf_finish_dynamic_symbol (bfd *output_bfd,
loongarch_elf_append_rela (output_bfd, srela, &rela);
}
+skip_got_reloc:
/* Mark some specially defined symbols as absolute. */
if (h == htab->elf.hdynamic || h == htab->elf.hgot || h == htab->elf.hplt)
@@ -5678,6 +6154,10 @@ elf_loongarch64_hash_symbol (struct elf_link_hash_entry *h)
#define elf_backend_grok_psinfo loongarch_elf_grok_psinfo
#define elf_backend_hash_symbol elf_loongarch64_hash_symbol
#define bfd_elfNN_bfd_relax_section loongarch_elf_relax_section
+#define elf_backend_size_relative_relocs loongarch_elf_size_relative_relocs
+#define elf_backend_finish_relative_relocs \
+ loongarch_elf_finish_relative_relocs
+#define bfd_elfNN_new_section_hook loongarch_elf_new_section_hook
#define elf_backend_dtrel_excludes_plt 1
diff --git a/binutils/testsuite/lib/binutils-common.exp b/binutils/testsuite/lib/binutils-common.exp
index 7e6bf16e..d006d30d 100644
--- a/binutils/testsuite/lib/binutils-common.exp
+++ b/binutils/testsuite/lib/binutils-common.exp
@@ -444,7 +444,8 @@ proc supports_persistent_section {} {
proc supports_dt_relr {} {
if { ([istarget x86_64-*-*]
|| [istarget i?86-*-*]
- || [istarget powerpc64*-*-*])
+ || [istarget powerpc64*-*-*]
+ || [istarget loongarch64*-*-*])
&& ([istarget *-*-linux*]
|| [istarget *-*-gnu*]) } {
return 1
diff --git a/ld/emulparams/elf64loongarch.sh b/ld/emulparams/elf64loongarch.sh
index d7b2229e..8c805da9 100644
--- a/ld/emulparams/elf64loongarch.sh
+++ b/ld/emulparams/elf64loongarch.sh
@@ -1,4 +1,5 @@
source_sh ${srcdir}/emulparams/elf64loongarch-defs.sh
+source_sh ${srcdir}/emulparams/dt-relr.sh
OUTPUT_FORMAT="elf64-loongarch"
case "$target" in
--
2.33.0
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