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RISC-V: Don't separate pcgp relaxation to another relax pass.

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Commit abd20cb637008da9d32018b4b03973e119388a0a and
ebdcad3fddf6ec21f6d4dcc702379a12718cf0c4 introduced additional
complexity into the paths run by the RISC-V relaxation pass in order to
resolve the issue of accurately keeping track of pcrel_hi and pcrel_lo
pairs. The first commit split up relaxation of these relocs into a pass
which occurred after other relaxations in order to prevent the situation
where bytes were deleted in between a pcrel_lo/pcrel_hi pair, inhibiting
our ability to find the corresponding pcrel_hi relocation from the
address attached to the pcrel_lo.

Since the relaxation was split into two passes the 'again' parameter
could not be used to perform the entire relaxation process again and so
the second commit added a way to restart ldelf_map_segments, thus
starting the whole process again.

Unfortunately this process could not account for the fact that we were
not finished with the relaxation process so in some cases - such as the
case where code would not fit in a memory region before the
R_RISCV_ALIGN relocation was relaxed - sanity checks in generic code
would fail.

This patch fixes all three of these concerns by reverting back to a
system of having only one target relax pass but updating entries in the
table of pcrel_hi/pcrel_lo relocs every time any bytes are deleted. Thus
we can keep track of the pairs accurately, and we can use the 'again'
parameter to restart the entire target relax pass, behaving in the way
that generic code expects. Unfortunately we must still have an
additional pass to delay deleting AUIPC bytes to avoid ambiguity between
pcrel_hi relocs stored in the table after deletion. This pass can only
be run once so we may potentially miss out on relaxation opportunities
but this is likely to be rare.

https://sourceware.org/bugzilla/show_bug.cgi?id=28410

bfd/
	* elfnn-riscv.c (riscv_elf_link_hash_table): Removed restart_relax.
	(riscv_elf_link_hash_table_create): Updated.
	(riscv_relax_delete_bytes): Moved after the riscv_update_pcgp_relocs.
	Update the pcgp_relocs table whenever bytes are deleted.
	(riscv_update_pcgp_relocs): Add function to update the section
	offset of pcrel_hi and pcrel_lo, and also update the symbol value
	of pcrel_hi.
	(_bfd_riscv_relax_call): Need to update the pcgp_relocs table
	when deleting codes.
	(_bfd_riscv_relax_lui): Likewise.
	(_bfd_riscv_relax_tls_le): Likewise.
	(_bfd_riscv_relax_align): Once we've handled an R_RISCV_ALIGN,
	we can't relax anything else, so set the sec->sec_flg0 to true.
	Besides, we don't need to update the pcgp_relocs table at this
	stage, so just pass NULL pointer as the pcgp_relocs table for
	riscv_relax_delete_bytes.
	(_bfd_riscv_relax_section): Use only one pass for all target
	relaxations.
	(_bfd_riscv_relax_delete): Likewise, we don't need to update
	the pcgp_relocs table at this stage, and don't need to set
	the `again' since restart_relax mechanism is abandoned.
	(bfd_elfNN_riscv_restart_relax_sections): Removed.
	(_bfd_riscv_relax_section): Updated.
	* elfxx-riscv.h (bfd_elf32_riscv_restart_relax_sections): Removed.
	(bfd_elf64_riscv_restart_relax_sections): Likewise.
ld/
	* emultempl/riscvelf.em: Revert restart_relax changes and set
	relax_pass to 3.
	* testsuite/ld-riscv-elf/align-small-region.d: New testcase.
	* testsuite/ld-riscv-elf/align-small-region.ld: Likewise.
	* testsuite/ld-riscv-elf/align-small-region.s: Likewise.
	* testsuite/ld-riscv-elf/restart-relax.d: Removed sine the
	restart_relax mechanism is abandoned.
	* testsuite/ld-riscv-elf/restart-relax.s: Likewise.
	* testsuite/ld-riscv-elf/ld-riscv-elf.exp: Updated.
This commit is contained in:
Lewis Revill
2021-10-21 11:15:47 +08:00
committed by Nelson Chu
parent 66cc044255
commit 9abcdc10b2
9 changed files with 215 additions and 216 deletions
Download Patch File Download Diff File Expand all files Collapse all files

354
bfd/elfnn-riscv.c
View File

@ -131,9 +131,6 @@ struct riscv_elf_link_hash_table
/* The index of the last unused .rel.iplt slot. */
bfd_vma last_iplt_index;
/* Re-run the relaxations from relax pass 0 if TRUE. */
bool restart_relax;
/* The data segment phase, don't relax the section
when it is exp_seg_relro_adjust. */
int *data_segment_phase;
@ -405,7 +402,6 @@ riscv_elf_link_hash_table_create (bfd *abfd)
}
ret->max_alignment = (bfd_vma) -1;
ret->restart_relax = false;
/* Create hash table for local ifunc. */
ret->loc_hash_table = htab_try_create (1024,
@ -3923,115 +3919,6 @@ _bfd_riscv_elf_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info)
return false;
}
/* Delete some bytes from a section while relaxing. */
static bool
riscv_relax_delete_bytes (bfd *abfd, asection *sec, bfd_vma addr, size_t count,
struct bfd_link_info *link_info)
{
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.
This test needs to use the original value of st_value, otherwise
we might accidentally decrease size when deleting bytes right
before the symbol. But since deleted relocs can't span across
symbols, we can't have both a st_value and a st_size decrease,
so it is simpler to just use an else. */
else 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];
/* The '--wrap SYMBOL' option is causing a pain when the object file,
containing the definition of __wrap_SYMBOL, includes a direct
call to SYMBOL as well. Since both __wrap_SYMBOL and SYMBOL reference
the same symbol (which is __wrap_SYMBOL), but still exist as two
different symbols in 'sym_hashes', we don't want to adjust
the global symbol __wrap_SYMBOL twice.
The same problem occurs with symbols that are versioned_hidden, as
foo becomes an alias for foo@BAR, and hence they need the same
treatment. */
if (link_info->wrap_hash != NULL
|| sym_hash->versioned != unversioned)
{
struct elf_link_hash_entry **cur_sym_hashes;
/* Loop only over the symbols which have already been checked. */
for (cur_sym_hashes = sym_hashes; cur_sym_hashes < &sym_hashes[i];
cur_sym_hashes++)
{
/* If the current symbol is identical to 'sym_hash', that means
the symbol was already adjusted (or at least checked). */
if (*cur_sym_hashes == sym_hash)
break;
}
/* Don't adjust the symbol again. */
if (cur_sym_hashes < &sym_hashes[i])
continue;
}
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. */
else 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;
}
/* A second format for recording PC-relative hi relocations. This stores the
information required to relax them to GP-relative addresses. */
@ -4162,6 +4049,155 @@ riscv_find_pcgp_lo_reloc (riscv_pcgp_relocs *p, bfd_vma hi_sec_off)
return false;
}
static void
riscv_update_pcgp_relocs (riscv_pcgp_relocs *p, asection *deleted_sec,
bfd_vma deleted_addr, size_t deleted_count)
{
/* Bytes have already been deleted and toaddr should match the old section
size for our checks, so adjust it here. */
bfd_vma toaddr = deleted_sec->size + deleted_count;
riscv_pcgp_lo_reloc *l;
riscv_pcgp_hi_reloc *h;
/* Update section offsets of corresponding pcrel_hi relocs for the pcrel_lo
entries where they occur after the deleted bytes. */
for (l = p->lo; l != NULL; l = l->next)
if (l->hi_sec_off > deleted_addr
&& l->hi_sec_off < toaddr)
l->hi_sec_off -= deleted_count;
/* Update both section offsets, and symbol values of pcrel_hi relocs where
these values occur after the deleted bytes. */
for (h = p->hi; h != NULL; h = h->next)
{
if (h->hi_sec_off > deleted_addr
&& h->hi_sec_off < toaddr)
h->hi_sec_off -= deleted_count;
if (h->sym_sec == deleted_sec
&& h->hi_addr > deleted_addr
&& h->hi_addr < toaddr)
h->hi_addr -= deleted_count;
}
}
/* Delete some bytes from a section while relaxing. */
static bool
riscv_relax_delete_bytes (bfd *abfd,
asection *sec,
bfd_vma addr,
size_t count,
struct bfd_link_info *link_info,
riscv_pcgp_relocs *p)
{
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 hi_sec_off, and the hi_addr of any entries in the pcgp relocs
table for which these values occur after the deleted bytes. */
if (p)
riscv_update_pcgp_relocs (p, sec, addr, 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.
This test needs to use the original value of st_value, otherwise
we might accidentally decrease size when deleting bytes right
before the symbol. But since deleted relocs can't span across
symbols, we can't have both a st_value and a st_size decrease,
so it is simpler to just use an else. */
else 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];
/* The '--wrap SYMBOL' option is causing a pain when the object file,
containing the definition of __wrap_SYMBOL, includes a direct
call to SYMBOL as well. Since both __wrap_SYMBOL and SYMBOL reference
the same symbol (which is __wrap_SYMBOL), but still exist as two
different symbols in 'sym_hashes', we don't want to adjust
the global symbol __wrap_SYMBOL twice.
The same problem occurs with symbols that are versioned_hidden, as
foo becomes an alias for foo@BAR, and hence they need the same
treatment. */
if (link_info->wrap_hash != NULL
|| sym_hash->versioned != unversioned)
{
struct elf_link_hash_entry **cur_sym_hashes;
/* Loop only over the symbols which have already been checked. */
for (cur_sym_hashes = sym_hashes; cur_sym_hashes < &sym_hashes[i];
cur_sym_hashes++)
{
/* If the current symbol is identical to 'sym_hash', that means
the symbol was already adjusted (or at least checked). */
if (*cur_sym_hashes == sym_hash)
break;
}
/* Don't adjust the symbol again. */
if (cur_sym_hashes < &sym_hashes[i])
continue;
}
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. */
else 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;
}
typedef bool (*relax_func_t) (bfd *, asection *, asection *,
struct bfd_link_info *,
Elf_Internal_Rela *,
@ -4179,7 +4215,7 @@ _bfd_riscv_relax_call (bfd *abfd, asection *sec, asection *sym_sec,
bfd_vma max_alignment,
bfd_vma reserve_size ATTRIBUTE_UNUSED,
bool *again,
riscv_pcgp_relocs *pcgp_relocs ATTRIBUTE_UNUSED,
riscv_pcgp_relocs *pcgp_relocs,
bool undefined_weak ATTRIBUTE_UNUSED)
{
bfd_byte *contents = elf_section_data (sec)->this_hdr.contents;
@ -4243,7 +4279,7 @@ _bfd_riscv_relax_call (bfd *abfd, asection *sec, asection *sym_sec,
/* Delete unnecessary JALR. */
*again = true;
return riscv_relax_delete_bytes (abfd, sec, rel->r_offset + len, 8 - len,
link_info);
link_info, pcgp_relocs);
}
/* Traverse all output sections and return the max alignment. */
@ -4275,7 +4311,7 @@ _bfd_riscv_relax_lui (bfd *abfd,
bfd_vma max_alignment,
bfd_vma reserve_size,
bool *again,
riscv_pcgp_relocs *pcgp_relocs ATTRIBUTE_UNUSED,
riscv_pcgp_relocs *pcgp_relocs,
bool undefined_weak)
{
bfd_byte *contents = elf_section_data (sec)->this_hdr.contents;
@ -4337,7 +4373,7 @@ _bfd_riscv_relax_lui (bfd *abfd,
rel->r_info = ELFNN_R_INFO (0, R_RISCV_NONE);
*again = true;
return riscv_relax_delete_bytes (abfd, sec, rel->r_offset, 4,
link_info);
link_info, pcgp_relocs);
default:
abort ();
@ -4370,7 +4406,7 @@ _bfd_riscv_relax_lui (bfd *abfd,
*again = true;
return riscv_relax_delete_bytes (abfd, sec, rel->r_offset + 2, 2,
link_info);
link_info, pcgp_relocs);
}
return true;
@ -4388,7 +4424,7 @@ _bfd_riscv_relax_tls_le (bfd *abfd,
bfd_vma max_alignment ATTRIBUTE_UNUSED,
bfd_vma reserve_size ATTRIBUTE_UNUSED,
bool *again,
riscv_pcgp_relocs *prcel_relocs ATTRIBUTE_UNUSED,
riscv_pcgp_relocs *pcgp_relocs,
bool undefined_weak ATTRIBUTE_UNUSED)
{
/* See if this symbol is in range of tp. */
@ -4411,7 +4447,8 @@ _bfd_riscv_relax_tls_le (bfd *abfd,
/* We can delete the unnecessary instruction 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, link_info);
return riscv_relax_delete_bytes (abfd, sec, rel->r_offset, 4, link_info,
pcgp_relocs);
default:
abort ();
@ -4430,7 +4467,7 @@ _bfd_riscv_relax_align (bfd *abfd, asection *sec,
bfd_vma max_alignment ATTRIBUTE_UNUSED,
bfd_vma reserve_size ATTRIBUTE_UNUSED,
bool *again ATTRIBUTE_UNUSED,
riscv_pcgp_relocs *pcrel_relocs ATTRIBUTE_UNUSED,
riscv_pcgp_relocs *pcgp_relocs ATTRIBUTE_UNUSED,
bool undefined_weak ATTRIBUTE_UNUSED)
{
bfd_byte *contents = elf_section_data (sec)->this_hdr.contents;
@ -4442,6 +4479,9 @@ _bfd_riscv_relax_align (bfd *abfd, asection *sec,
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)
{
@ -4471,7 +4511,8 @@ _bfd_riscv_relax_align (bfd *abfd, asection *sec,
/* Delete the excess bytes. */
return riscv_relax_delete_bytes (abfd, sec, rel->r_offset + nop_bytes,
rel->r_addend - nop_bytes, link_info);
rel->r_addend - nop_bytes, link_info,
NULL);
}
/* Relax PC-relative references to GP-relative references. */
@ -4637,15 +4678,14 @@ _bfd_riscv_relax_delete (bfd *abfd,
bfd_vma symval ATTRIBUTE_UNUSED,
bfd_vma max_alignment ATTRIBUTE_UNUSED,
bfd_vma reserve_size ATTRIBUTE_UNUSED,
bool *again,
bool *again ATTRIBUTE_UNUSED,
riscv_pcgp_relocs *pcgp_relocs ATTRIBUTE_UNUSED,
bool undefined_weak ATTRIBUTE_UNUSED)
{
if (!riscv_relax_delete_bytes (abfd, sec, rel->r_offset, rel->r_addend,
link_info))
link_info, NULL))
return false;
rel->r_info = ELFNN_R_INFO (0, R_RISCV_NONE);
*again = true;
return true;
}
@ -4660,35 +4700,11 @@ bfd_elfNN_riscv_set_data_segment_info (struct bfd_link_info *info,
htab->data_segment_phase = data_segment_phase;
}
/* Called by after_allocation to check if we need to run the whole
relaxations again. */
bool
bfd_elfNN_riscv_restart_relax_sections (struct bfd_link_info *info)
{
struct riscv_elf_link_hash_table *htab = riscv_elf_hash_table (info);
bool restart = htab->restart_relax;
/* Reset the flag. */
htab->restart_relax = false;
return restart;
}
/* Relax a section.
Pass 0: Shortens code sequences for LUI/CALL/TPREL relocs.
Pass 1: Shortens code sequences for PCREL relocs.
Pass 2: Deletes the bytes that pass 1 made obsolete.
Pass 3: Which cannot be disabled, handles code alignment directives.
The `again` is used to determine whether the relax pass itself needs to
run again. And the `restart_relax` is used to determine if we need to
run the whole relax passes again from 0 to 2. Once we have deleted the
code between relax pass 0 to 2, the restart_relax will be set to TRUE,
and we should run the whole relaxations again to give them more chances
to shorten the code.
Since we can't relax anything else once we start to handle the alignments,
we will only enter into the relax pass 3 when the restart_relax is FALSE. */
Pass 0: Shortens code sequences for LUI/CALL/TPREL/PCREL relocs.
Pass 1: Deletes the bytes that PCREL relaxation in pass 0 made obsolete.
Pass 2: Which cannot be disabled, handles code alignment directives. */
static bool
_bfd_riscv_relax_section (bfd *abfd, asection *sec,
@ -4707,12 +4723,11 @@ _bfd_riscv_relax_section (bfd *abfd, asection *sec,
*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 < 2)
|| (htab->restart_relax
&& info->relax_pass == 3)
&& info->relax_pass == 0)
/* The exp_seg_relro_adjust is enum phase_enum (0x4),
and defined in ld/ldexp.h. */
|| *(htab->data_segment_phase) == 4)
@ -4765,24 +4780,14 @@ _bfd_riscv_relax_section (bfd *abfd, asection *sec,
|| type == R_RISCV_TPREL_LO12_I
|| type == R_RISCV_TPREL_LO12_S)
relax_func = _bfd_riscv_relax_tls_le;
else if (!bfd_link_pic (info)
&& (type == R_RISCV_PCREL_HI20
|| type == R_RISCV_PCREL_LO12_I
|| type == R_RISCV_PCREL_LO12_S))
relax_func = _bfd_riscv_relax_pc;
else
continue;
}
else if (info->relax_pass == 1
&& !bfd_link_pic (info)
&& (type == R_RISCV_PCREL_HI20
|| type == R_RISCV_PCREL_LO12_I
|| type == R_RISCV_PCREL_LO12_S))
relax_func = _bfd_riscv_relax_pc;
else if (info->relax_pass == 2 && type == R_RISCV_DELETE)
relax_func = _bfd_riscv_relax_delete;
else if (info->relax_pass == 3 && type == R_RISCV_ALIGN)
relax_func = _bfd_riscv_relax_align;
else
continue;
if (info->relax_pass < 2)
{
/* Only relax this reloc if it is paired with R_RISCV_RELAX. */
if (i == sec->reloc_count - 1
|| ELFNN_R_TYPE ((rel + 1)->r_info) != R_RISCV_RELAX
@ -4792,6 +4797,12 @@ _bfd_riscv_relax_section (bfd *abfd, asection *sec,
/* Skip over the R_RISCV_RELAX. */
i++;
}
else if (info->relax_pass == 1 && type == R_RISCV_DELETE)
relax_func = _bfd_riscv_relax_delete;
else if (info->relax_pass == 2 && type == R_RISCV_ALIGN)
relax_func = _bfd_riscv_relax_align;
else
continue;
data->relocs = relocs;
@ -4954,9 +4965,6 @@ _bfd_riscv_relax_section (bfd *abfd, asection *sec,
free (relocs);
riscv_free_pcgp_relocs (&pcgp_relocs, abfd, sec);
if (*again)
htab->restart_relax = true;
return ret;
}

5
bfd/elfxx-riscv.h
View File

@ -92,11 +92,6 @@ riscv_estimate_digit (unsigned);
extern int
riscv_compare_subsets (const char *, const char *);
extern bool
bfd_elf32_riscv_restart_relax_sections (struct bfd_link_info *);
extern bool
bfd_elf64_riscv_restart_relax_sections (struct bfd_link_info *);
extern void
bfd_elf32_riscv_set_data_segment_info (struct bfd_link_info *, int *);
extern void

8
ld/emultempl/riscvelf.em
View File

@ -42,7 +42,7 @@ riscv_elf_before_allocation (void)
ENABLE_RELAXATION;
}
link_info.relax_pass = 4;
link_info.relax_pass = 3;
}
static void
@ -76,11 +76,7 @@ gld${EMULATION_NAME}_after_allocation (void)
enum phase_enum *phase = &(expld.dataseg.phase);
bfd_elf${ELFSIZE}_riscv_set_data_segment_info (&link_info, (int *) phase);
do
{
ldelf_map_segments (need_layout);
}
while (bfd_elf${ELFSIZE}_riscv_restart_relax_sections (&link_info));
ldelf_map_segments (need_layout);
}
/* This is a convenient point to tell BFD about target specific flags.

12
ld/testsuite/ld-riscv-elf/align-small-region.d Normal file
View File

@ -0,0 +1,12 @@
#source: align-small-region.s
#as: -march=rv32i
#ld: -melf32lriscv --relax -Talign-small-region.ld --defsym=_start=0x100
#objdump: -d
.*:[ ]+file format .*
Disassembly of section \.entry:
00000000 <_reset>:
.*:[ ]+[0-9a-f]+[ ]+j[ ]+100[ ]+<_start>
#pass

12
ld/testsuite/ld-riscv-elf/align-small-region.ld Normal file
View File

@ -0,0 +1,12 @@
MEMORY
{
reset : ORIGIN = 0x0, LENGTH = 32
}
SECTIONS
{
.entry :
{
KEEP (*(.entry))
} > reset
}

7
ld/testsuite/ld-riscv-elf/align-small-region.s Normal file
View File

@ -0,0 +1,7 @@
.section .entry, "xa"
.align 5
.globl _reset
.type _reset, @function
_reset:
tail _start
.size _reset, . - _reset

2
ld/testsuite/ld-riscv-elf/ld-riscv-elf.exp
View File

@ -119,6 +119,7 @@ proc run_relax_twice_test {} {
}
if [istarget "riscv*-*-*"] {
run_dump_test "align-small-region"
run_dump_test "call-relax"
run_dump_test "pcgp-relax"
run_dump_test "c-lui"
@ -130,7 +131,6 @@ if [istarget "riscv*-*-*"] {
run_dump_test "pcrel-lo-addend-3a"
run_dump_test "pcrel-lo-addend-3b"
run_dump_test "pcrel-lo-addend-3c"
run_dump_test "restart-relax"
run_dump_test "attr-merge-arch-01"
run_dump_test "attr-merge-arch-02"
run_dump_test "attr-merge-arch-03"

14
ld/testsuite/ld-riscv-elf/restart-relax.d
View File

@ -1,14 +0,0 @@
#source: restart-relax.s
#as:
#ld:
#objdump: -d
#...
Disassembly of section .text:
0+[0-9a-f]+ <_start>:
.*:[ ]+[0-9a-f]+[ ]+addi[ ]+.*
#...
.*:[ ]+[0-9a-f]+[ ]+jal[ ]+ra,[0-9a-f]+ <_start>
.*:[ ]+[0-9a-f]+[ ]+add[ ]+a0,a1,a2
#pass

17
ld/testsuite/ld-riscv-elf/restart-relax.s
View File

@ -1,17 +0,0 @@
.text
.global _start
_start:
lla a0, data_g
.rept 0x3fffe
nop
.endr
call _start
.option rvc
.align 2
add a0, a1, a2
.data
.global data_g
.dword 0x0
data_g:
.word 0x1000