bfd_boolean
_bfd_write_stab_strings (bfd *output_bfd, struct stab_info *sinfo)
{
if (bfd_is_abs_section (sinfo->stabstr->output_section))
/* The section was discarded from the link. */
return TRUE;
BFD_ASSERT ((sinfo->stabstr->output_offset
+ _bfd_stringtab_size (sinfo->strings))
<= sinfo->stabstr->output_section->size);
if (bfd_seek (output_bfd,
(file_ptr) (sinfo->stabstr->output_section->filepos
+ sinfo->stabstr->output_offset),
SEEK_SET) != 0)
return FALSE;
if (! _bfd_stringtab_emit (output_bfd, sinfo->strings))
return FALSE;
/* We no longer need the stabs information. */
_bfd_stringtab_free (sinfo->strings);
bfd_hash_table_free (&sinfo->includes);
return TRUE;
}
bfd_boolean
_bfd_elf_maybe_strip_eh_frame_hdr (struct bfd_link_info *info)
{
asection *o;
bfd *abfd;
struct elf_link_hash_table *htab;
struct eh_frame_hdr_info *hdr_info;
htab = elf_hash_table (info);
hdr_info = &htab->eh_info;
if (hdr_info->hdr_sec == NULL)
return TRUE;
if (bfd_is_abs_section (hdr_info->hdr_sec->output_section))
{
hdr_info->hdr_sec = NULL;
return TRUE;
}
abfd = NULL;
if (info->eh_frame_hdr)
for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link_next)
{
/* Count only sections which have at least a single CIE or FDE.
There cannot be any CIE or FDE <= 8 bytes. */
o = bfd_get_section_by_name (abfd, ".eh_frame");
if (o && o->size > 8 && !bfd_is_abs_section (o->output_section))
break;
}
if (abfd == NULL)
{
hdr_info->hdr_sec->flags |= SEC_EXCLUDE;
hdr_info->hdr_sec = NULL;
return TRUE;
}
hdr_info->table = TRUE;
return TRUE;
}
/*
FUNCTION
bfd_decode_symclass
DESCRIPTION
Return a character corresponding to the symbol
class of @var{symbol}, or '?' for an unknown class.
SYNOPSIS
int bfd_decode_symclass (asymbol *symbol);
*/
int
bfd_decode_symclass (asymbol *symbol)
{
char c;
if (symbol->section && bfd_is_com_section (symbol->section))
return 'C';
if (bfd_is_und_section (symbol->section))
{
if (symbol->flags & BSF_WEAK)
{
/* If weak, determine if it's specifically an object
or non-object weak. */
if (symbol->flags & BSF_OBJECT)
return 'v';
else
return 'w';
}
else
return 'U';
}
if (bfd_is_ind_section (symbol->section))
return 'I';
if (symbol->flags & BSF_GNU_INDIRECT_FUNCTION)
return 'i';
if (symbol->flags & BSF_WEAK)
{
/* If weak, determine if it's specifically an object
or non-object weak. */
if (symbol->flags & BSF_OBJECT)
return 'V';
else
return 'W';
}
if (symbol->flags & BSF_GNU_UNIQUE)
return 'u';
if (!(symbol->flags & (BSF_GLOBAL | BSF_LOCAL)))
return '?';
if (bfd_is_abs_section (symbol->section))
c = 'a';
else if (symbol->section)
{
c = coff_section_type (symbol->section->name);
if (c == '?')
c = decode_section_type (symbol->section);
}
else
return '?';
if (symbol->flags & BSF_GLOBAL)
c = TOUPPER (c);
return c;
/* We don't have to handle these cases just yet, but we will soon:
N_SETV: 'v';
N_SETA: 'l';
N_SETT: 'x';
N_SETD: 'z';
N_SETB: 's';
N_INDR: 'i';
*/
}
void
ldctor_build_sets (void)
{
static bfd_boolean called;
bfd_boolean header_printed;
struct set_info *p;
/* The emulation code may call us directly, but we only want to do
this once. */
if (called)
return;
called = TRUE;
if (constructors_sorted)
{
for (p = sets; p != NULL; p = p->next)
{
int c, i;
struct set_element *e;
struct set_element **array;
if (p->elements == NULL)
continue;
c = 0;
for (e = p->elements; e != NULL; e = e->next)
++c;
array = xmalloc (c * sizeof *array);
i = 0;
for (e = p->elements; e != NULL; e = e->next)
{
array[i] = e;
++i;
}
qsort (array, c, sizeof *array, ctor_cmp);
e = array[0];
p->elements = e;
for (i = 0; i < c - 1; i++)
array[i]->next = array[i + 1];
array[i]->next = NULL;
free (array);
}
}
lang_list_init (&constructor_list);
push_stat_ptr (&constructor_list);
header_printed = FALSE;
for (p = sets; p != NULL; p = p->next)
{
struct set_element *e;
reloc_howto_type *howto;
int reloc_size, size;
/* If the symbol is defined, we may have been invoked from
collect, and the sets may already have been built, so we do
not do anything. */
if (p->h->type == bfd_link_hash_defined
|| p->h->type == bfd_link_hash_defweak)
continue;
/* For each set we build:
set:
.long number_of_elements
.long element0
...
.long elementN
.long 0
except that we use the right size instead of .long. When
generating relocatable output, we generate relocs instead of
addresses. */
howto = bfd_reloc_type_lookup (link_info.output_bfd, p->reloc);
if (howto == NULL)
{
if (link_info.relocatable)
{
einfo (_("%P%X: %s does not support reloc %s for set %s\n"),
bfd_get_target (link_info.output_bfd),
bfd_get_reloc_code_name (p->reloc),
p->h->root.string);
continue;
}
/* If this is not a relocatable link, all we need is the
size, which we can get from the input BFD. */
if (p->elements->section->owner != NULL)
howto = bfd_reloc_type_lookup (p->elements->section->owner,
p->reloc);
if (howto == NULL)
{
einfo (_("%P%X: %s does not support reloc %s for set %s\n"),
bfd_get_target (p->elements->section->owner),
bfd_get_reloc_code_name (p->reloc),
p->h->root.string);
continue;
}
}
reloc_size = bfd_get_reloc_size (howto);
switch (reloc_size)
{
case 1: size = BYTE; break;
case 2: size = SHORT; break;
case 4: size = LONG; break;
case 8:
if (howto->complain_on_overflow == complain_overflow_signed)
size = SQUAD;
else
size = QUAD;
break;
default:
einfo (_("%P%X: Unsupported size %d for set %s\n"),
bfd_get_reloc_size (howto), p->h->root.string);
size = LONG;
break;
}
lang_add_assignment (exp_assop ('=', ".",
exp_unop (ALIGN_K,
exp_intop (reloc_size))));
lang_add_assignment (exp_assop ('=', p->h->root.string,
exp_nameop (NAME, ".")));
lang_add_data (size, exp_intop (p->count));
for (e = p->elements; e != NULL; e = e->next)
{
if (config.map_file != NULL)
{
int len;
if (! header_printed)
{
minfo (_("\nSet Symbol\n\n"));
header_printed = TRUE;
}
minfo ("%s", p->h->root.string);
len = strlen (p->h->root.string);
if (len >= 19)
{
print_nl ();
len = 0;
}
while (len < 20)
{
print_space ();
++len;
}
if (e->name != NULL)
minfo ("%T\n", e->name);
else
minfo ("%G\n", e->section->owner, e->section, e->value);
}
/* Need SEC_KEEP for --gc-sections. */
if (! bfd_is_abs_section (e->section))
e->section->flags |= SEC_KEEP;
if (link_info.relocatable)
lang_add_reloc (p->reloc, howto, e->section, e->name,
exp_intop (e->value));
else
lang_add_data (size, exp_relop (e->section, e->value));
}
lang_add_data (size, exp_intop (0));
}
pop_stat_ptr ();
}
bfd_boolean
_bfd_elf_discard_section_eh_frame
(bfd *abfd, struct bfd_link_info *info, asection *sec,
bfd_boolean (*reloc_symbol_deleted_p) (bfd_vma, void *),
struct elf_reloc_cookie *cookie)
{
#define REQUIRE(COND) \
do \
if (!(COND)) \
goto free_no_table; \
while (0)
bfd_byte *ehbuf = NULL, *buf;
bfd_byte *last_fde;
struct eh_cie_fde *ent, *this_inf;
unsigned int hdr_length, hdr_id;
struct extended_cie
{
struct cie cie;
unsigned int offset;
unsigned int usage_count;
unsigned int entry;
} *ecies = NULL, *ecie;
unsigned int ecie_count = 0, ecie_alloced = 0;
struct cie *cie;
struct elf_link_hash_table *htab;
struct eh_frame_hdr_info *hdr_info;
struct eh_frame_sec_info *sec_info = NULL;
unsigned int offset;
unsigned int ptr_size;
unsigned int entry_alloced;
if (sec->size == 0)
{
/* This file does not contain .eh_frame information. */
return FALSE;
}
if (bfd_is_abs_section (sec->output_section))
{
/* At least one of the sections is being discarded from the
link, so we should just ignore them. */
return FALSE;
}
htab = elf_hash_table (info);
hdr_info = &htab->eh_info;
if (hdr_info->cies == NULL && !info->relocatable)
hdr_info->cies = htab_try_create (1, cie_hash, cie_eq, free);
/* Read the frame unwind information from abfd. */
REQUIRE (bfd_malloc_and_get_section (abfd, sec, &ehbuf));
if (sec->size >= 4
&& bfd_get_32 (abfd, ehbuf) == 0
&& cookie->rel == cookie->relend)
{
/* Empty .eh_frame section. */
free (ehbuf);
return FALSE;
}
/* If .eh_frame section size doesn't fit into int, we cannot handle
it (it would need to use 64-bit .eh_frame format anyway). */
REQUIRE (sec->size == (unsigned int) sec->size);
ptr_size = (get_elf_backend_data (abfd)
->elf_backend_eh_frame_address_size (abfd, sec));
REQUIRE (ptr_size != 0);
buf = ehbuf;
sec_info = bfd_zmalloc (sizeof (struct eh_frame_sec_info)
+ 99 * sizeof (struct eh_cie_fde));
REQUIRE (sec_info);
entry_alloced = 100;
#define ENSURE_NO_RELOCS(buf) \
REQUIRE (!(cookie->rel < cookie->relend \
&& (cookie->rel->r_offset \
< (bfd_size_type) ((buf) - ehbuf)) \
&& cookie->rel->r_info != 0))
#define SKIP_RELOCS(buf) \
while (cookie->rel < cookie->relend \
&& (cookie->rel->r_offset \
< (bfd_size_type) ((buf) - ehbuf))) \
cookie->rel++
#define GET_RELOC(buf) \
((cookie->rel < cookie->relend \
&& (cookie->rel->r_offset \
== (bfd_size_type) ((buf) - ehbuf))) \
? cookie->rel : NULL)
for (;;)
{
char *aug;
bfd_byte *start, *end, *insns, *insns_end;
bfd_size_type length;
unsigned int set_loc_count;
if (sec_info->count == entry_alloced)
{
sec_info = bfd_realloc (sec_info,
sizeof (struct eh_frame_sec_info)
+ ((entry_alloced + 99)
* sizeof (struct eh_cie_fde)));
REQUIRE (sec_info);
memset (&sec_info->entry[entry_alloced], 0,
100 * sizeof (struct eh_cie_fde));
entry_alloced += 100;
}
this_inf = sec_info->entry + sec_info->count;
last_fde = buf;
if ((bfd_size_type) (buf - ehbuf) == sec->size)
break;
/* Read the length of the entry. */
REQUIRE (skip_bytes (&buf, ehbuf + sec->size, 4));
hdr_length = bfd_get_32 (abfd, buf - 4);
/* 64-bit .eh_frame is not supported. */
REQUIRE (hdr_length != 0xffffffff);
/* The CIE/FDE must be fully contained in this input section. */
REQUIRE ((bfd_size_type) (buf - ehbuf) + hdr_length <= sec->size);
end = buf + hdr_length;
this_inf->offset = last_fde - ehbuf;
this_inf->size = 4 + hdr_length;
if (hdr_length == 0)
{
/* A zero-length CIE should only be found at the end of
the section. */
REQUIRE ((bfd_size_type) (buf - ehbuf) == sec->size);
ENSURE_NO_RELOCS (buf);
sec_info->count++;
break;
}
REQUIRE (skip_bytes (&buf, end, 4));
hdr_id = bfd_get_32 (abfd, buf - 4);
if (hdr_id == 0)
{
unsigned int initial_insn_length;
/* CIE */
this_inf->cie = 1;
if (ecie_count == ecie_alloced)
{
ecies = bfd_realloc (ecies,
(ecie_alloced + 20) * sizeof (*ecies));
REQUIRE (ecies);
memset (&ecies[ecie_alloced], 0, 20 * sizeof (*ecies));
ecie_alloced += 20;
}
cie = &ecies[ecie_count].cie;
ecies[ecie_count].offset = this_inf->offset;
ecies[ecie_count++].entry = sec_info->count;
cie->length = hdr_length;
start = buf;
REQUIRE (read_byte (&buf, end, &cie->version));
/* Cannot handle unknown versions. */
REQUIRE (cie->version == 1 || cie->version == 3);
REQUIRE (strlen ((char *) buf) < sizeof (cie->augmentation));
strcpy (cie->augmentation, (char *) buf);
buf = (bfd_byte *) strchr ((char *) buf, '\0') + 1;
ENSURE_NO_RELOCS (buf);
if (buf[0] == 'e' && buf[1] == 'h')
{
/* GCC < 3.0 .eh_frame CIE */
/* We cannot merge "eh" CIEs because __EXCEPTION_TABLE__
is private to each CIE, so we don't need it for anything.
Just skip it. */
REQUIRE (skip_bytes (&buf, end, ptr_size));
SKIP_RELOCS (buf);
}
REQUIRE (read_uleb128 (&buf, end, &cie->code_align));
REQUIRE (read_sleb128 (&buf, end, &cie->data_align));
if (cie->version == 1)
{
REQUIRE (buf < end);
cie->ra_column = *buf++;
}
else
REQUIRE (read_uleb128 (&buf, end, &cie->ra_column));
ENSURE_NO_RELOCS (buf);
cie->lsda_encoding = DW_EH_PE_omit;
cie->fde_encoding = DW_EH_PE_omit;
cie->per_encoding = DW_EH_PE_omit;
aug = cie->augmentation;
if (aug[0] != 'e' || aug[1] != 'h')
{
if (*aug == 'z')
{
aug++;
REQUIRE (read_uleb128 (&buf, end, &cie->augmentation_size));
ENSURE_NO_RELOCS (buf);
}
while (*aug != '\0')
switch (*aug++)
{
case 'L':
REQUIRE (read_byte (&buf, end, &cie->lsda_encoding));
ENSURE_NO_RELOCS (buf);
REQUIRE (get_DW_EH_PE_width (cie->lsda_encoding, ptr_size));
break;
case 'R':
REQUIRE (read_byte (&buf, end, &cie->fde_encoding));
ENSURE_NO_RELOCS (buf);
REQUIRE (get_DW_EH_PE_width (cie->fde_encoding, ptr_size));
break;
case 'S':
break;
case 'P':
{
int per_width;
REQUIRE (read_byte (&buf, end, &cie->per_encoding));
per_width = get_DW_EH_PE_width (cie->per_encoding,
ptr_size);
REQUIRE (per_width);
if ((cie->per_encoding & 0xf0) == DW_EH_PE_aligned)
{
length = -(buf - ehbuf) & (per_width - 1);
REQUIRE (skip_bytes (&buf, end, length));
}
ENSURE_NO_RELOCS (buf);
/* Ensure we have a reloc here. */
if (GET_RELOC (buf) != NULL)
{
unsigned long r_symndx;
#ifdef BFD64
if (ptr_size == 8)
r_symndx = ELF64_R_SYM (cookie->rel->r_info);
else
#endif
r_symndx = ELF32_R_SYM (cookie->rel->r_info);
if (r_symndx >= cookie->locsymcount
|| ELF_ST_BIND (cookie->locsyms[r_symndx]
.st_info) != STB_LOCAL)
{
struct elf_link_hash_entry *h;
r_symndx -= cookie->extsymoff;
h = cookie->sym_hashes[r_symndx];
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;
cie->personality.h = h;
}
else
{
Elf_Internal_Sym *sym;
asection *sym_sec;
bfd_vma val;
sym = &cookie->locsyms[r_symndx];
sym_sec = (bfd_section_from_elf_index
(abfd, sym->st_shndx));
if (sym_sec != NULL)
{
if (sym_sec->kept_section != NULL)
sym_sec = sym_sec->kept_section;
if (sym_sec->output_section != NULL)
{
val = (sym->st_value
+ sym_sec->output_offset
+ sym_sec->output_section->vma);
cie->personality.val = val;
cie->local_personality = 1;
}
}
}
/* Cope with MIPS-style composite relocations. */
do
cookie->rel++;
while (GET_RELOC (buf) != NULL);
}
REQUIRE (skip_bytes (&buf, end, per_width));
REQUIRE (cie->local_personality || cie->personality.h);
}
break;
default:
/* Unrecognized augmentation. Better bail out. */
goto free_no_table;
}
}
/* For shared libraries, try to get rid of as many RELATIVE relocs
as possible. */
if (info->shared
&& (get_elf_backend_data (abfd)
->elf_backend_can_make_relative_eh_frame
(abfd, info, sec)))
{
if ((cie->fde_encoding & 0xf0) == DW_EH_PE_absptr)
cie->make_relative = 1;
/* If the CIE doesn't already have an 'R' entry, it's fairly
easy to add one, provided that there's no aligned data
after the augmentation string. */
else if (cie->fde_encoding == DW_EH_PE_omit
&& (cie->per_encoding & 0xf0) != DW_EH_PE_aligned)
{
if (*cie->augmentation == 0)
this_inf->add_augmentation_size = 1;
this_inf->add_fde_encoding = 1;
cie->make_relative = 1;
}
}
if (info->shared
&& (get_elf_backend_data (abfd)
->elf_backend_can_make_lsda_relative_eh_frame
(abfd, info, sec))
&& (cie->lsda_encoding & 0xf0) == DW_EH_PE_absptr)
cie->make_lsda_relative = 1;
/* If FDE encoding was not specified, it defaults to
DW_EH_absptr. */
if (cie->fde_encoding == DW_EH_PE_omit)
cie->fde_encoding = DW_EH_PE_absptr;
initial_insn_length = end - buf;
if (initial_insn_length <= sizeof (cie->initial_instructions))
{
cie->initial_insn_length = initial_insn_length;
memcpy (cie->initial_instructions, buf, initial_insn_length);
}
insns = buf;
buf += initial_insn_length;
ENSURE_NO_RELOCS (buf);
}
else
{
/* Find the corresponding CIE. */
unsigned int cie_offset = this_inf->offset + 4 - hdr_id;
for (ecie = ecies; ecie < ecies + ecie_count; ++ecie)
if (cie_offset == ecie->offset)
break;
/* Ensure this FDE references one of the CIEs in this input
section. */
REQUIRE (ecie != ecies + ecie_count);
cie = &ecie->cie;
ENSURE_NO_RELOCS (buf);
REQUIRE (GET_RELOC (buf));
if ((*reloc_symbol_deleted_p) (buf - ehbuf, cookie))
/* This is a FDE against a discarded section. It should
be deleted. */
this_inf->removed = 1;
else
{
if (info->shared
&& (((cie->fde_encoding & 0xf0) == DW_EH_PE_absptr
&& cie->make_relative == 0)
|| (cie->fde_encoding & 0xf0) == DW_EH_PE_aligned))
{
/* If a shared library uses absolute pointers
which we cannot turn into PC relative,
don't create the binary search table,
since it is affected by runtime relocations. */
hdr_info->table = FALSE;
(*info->callbacks->einfo)
(_("%P: fde encoding in %B(%A) prevents .eh_frame_hdr"
" table being created.\n"), abfd, sec);
}
ecie->usage_count++;
hdr_info->fde_count++;
this_inf->cie_inf = (void *) (ecie - ecies);
}
/* Skip the initial location and address range. */
start = buf;
length = get_DW_EH_PE_width (cie->fde_encoding, ptr_size);
REQUIRE (skip_bytes (&buf, end, 2 * length));
/* Skip the augmentation size, if present. */
if (cie->augmentation[0] == 'z')
REQUIRE (read_uleb128 (&buf, end, &length));
else
length = 0;
/* Of the supported augmentation characters above, only 'L'
adds augmentation data to the FDE. This code would need to
be adjusted if any future augmentations do the same thing. */
if (cie->lsda_encoding != DW_EH_PE_omit)
{
this_inf->lsda_offset = buf - start;
/* If there's no 'z' augmentation, we don't know where the
CFA insns begin. Assume no padding. */
if (cie->augmentation[0] != 'z')
length = end - buf;
}
/* Skip over the augmentation data. */
REQUIRE (skip_bytes (&buf, end, length));
insns = buf;
buf = last_fde + 4 + hdr_length;
SKIP_RELOCS (buf);
}
/* Try to interpret the CFA instructions and find the first
padding nop. Shrink this_inf's size so that it doesn't
include the padding. */
length = get_DW_EH_PE_width (cie->fde_encoding, ptr_size);
set_loc_count = 0;
insns_end = skip_non_nops (insns, end, length, &set_loc_count);
/* If we don't understand the CFA instructions, we can't know
what needs to be adjusted there. */
if (insns_end == NULL
/* For the time being we don't support DW_CFA_set_loc in
CIE instructions. */
|| (set_loc_count && this_inf->cie))
goto free_no_table;
this_inf->size -= end - insns_end;
if (insns_end != end && this_inf->cie)
{
cie->initial_insn_length -= end - insns_end;
cie->length -= end - insns_end;
}
if (set_loc_count
&& ((cie->fde_encoding & 0xf0) == DW_EH_PE_pcrel
|| cie->make_relative))
{
unsigned int cnt;
bfd_byte *p;
this_inf->set_loc = bfd_malloc ((set_loc_count + 1)
* sizeof (unsigned int));
REQUIRE (this_inf->set_loc);
this_inf->set_loc[0] = set_loc_count;
p = insns;
cnt = 0;
while (p < end)
{
if (*p == DW_CFA_set_loc)
this_inf->set_loc[++cnt] = p + 1 - start;
REQUIRE (skip_cfa_op (&p, end, length));
}
}
this_inf->fde_encoding = cie->fde_encoding;
this_inf->lsda_encoding = cie->lsda_encoding;
sec_info->count++;
}
elf_section_data (sec)->sec_info = sec_info;
sec->sec_info_type = ELF_INFO_TYPE_EH_FRAME;
/* Look at all CIEs in this section and determine which can be
removed as unused, which can be merged with previous duplicate
CIEs and which need to be kept. */
for (ecie = ecies; ecie < ecies + ecie_count; ++ecie)
{
if (ecie->usage_count == 0)
{
sec_info->entry[ecie->entry].removed = 1;
continue;
}
ecie->cie.output_sec = sec->output_section;
ecie->cie.cie_inf = sec_info->entry + ecie->entry;
cie_compute_hash (&ecie->cie);
if (hdr_info->cies != NULL)
{
void **loc = htab_find_slot_with_hash (hdr_info->cies, &ecie->cie,
ecie->cie.hash, INSERT);
if (loc != NULL)
{
if (*loc != HTAB_EMPTY_ENTRY)
{
sec_info->entry[ecie->entry].removed = 1;
ecie->cie.cie_inf = ((struct cie *) *loc)->cie_inf;
continue;
}
*loc = malloc (sizeof (struct cie));
if (*loc == NULL)
*loc = HTAB_DELETED_ENTRY;
else
memcpy (*loc, &ecie->cie, sizeof (struct cie));
}
}
ecie->cie.cie_inf->make_relative = ecie->cie.make_relative;
ecie->cie.cie_inf->make_lsda_relative = ecie->cie.make_lsda_relative;
ecie->cie.cie_inf->per_encoding_relative
= (ecie->cie.per_encoding & 0x70) == DW_EH_PE_pcrel;
}
/* Ok, now we can assign new offsets. */
offset = 0;
for (ent = sec_info->entry; ent < sec_info->entry + sec_info->count; ++ent)
if (!ent->removed)
{
if (!ent->cie)
{
ecie = ecies + (bfd_hostptr_t) ent->cie_inf;
ent->cie_inf = ecie->cie.cie_inf;
}
ent->new_offset = offset;
offset += size_of_output_cie_fde (ent, ptr_size);
}
/* Resize the sec as needed. */
sec->rawsize = sec->size;
sec->size = offset;
free (ehbuf);
if (ecies)
free (ecies);
return offset != sec->rawsize;
free_no_table:
(*info->callbacks->einfo)
(_("%P: error in %B(%A); no .eh_frame_hdr table will be created.\n"),
abfd, sec);
if (ehbuf)
free (ehbuf);
if (sec_info)
free (sec_info);
if (ecies)
free (ecies);
hdr_info->table = FALSE;
return FALSE;
#undef REQUIRE
}
static void
NAME(lynx,swap_std_reloc_out) (bfd *abfd,
arelent *g,
struct reloc_std_external *natptr)
{
int r_index;
asymbol *sym = *(g->sym_ptr_ptr);
int r_extern;
unsigned int r_length;
int r_pcrel;
int r_baserel, r_jmptable, r_relative;
asection *output_section = sym->section->output_section;
PUT_WORD (abfd, g->address, natptr->r_address);
r_length = g->howto->size; /* Size as a power of two */
r_pcrel = (int) g->howto->pc_relative; /* Relative to PC? */
/* r_baserel, r_jmptable, r_relative??? FIXME-soon */
r_baserel = 0;
r_jmptable = 0;
r_relative = 0;
/* name was clobbered by aout_write_syms to be symbol index */
/* If this relocation is relative to a symbol then set the
r_index to the symbols index, and the r_extern bit.
Absolute symbols can come in in two ways, either as an offset
from the abs section, or as a symbol which has an abs value.
check for that here
*/
if (bfd_is_com_section (output_section)
|| bfd_is_abs_section (output_section)
|| bfd_is_und_section (output_section))
{
if (bfd_abs_section_ptr->symbol == sym)
{
/* Whoops, looked like an abs symbol, but is really an offset
from the abs section */
r_index = 0;
r_extern = 0;
}
else
{
/* Fill in symbol */
r_extern = 1;
r_index = (*g->sym_ptr_ptr)->KEEPIT;
}
}
else
{
/* Just an ordinary section */
r_extern = 0;
r_index = output_section->target_index;
}
/* now the fun stuff */
if (bfd_header_big_endian (abfd))
{
natptr->r_index[0] = r_index >> 16;
natptr->r_index[1] = r_index >> 8;
natptr->r_index[2] = r_index;
natptr->r_type[0] =
(r_extern ? RELOC_STD_BITS_EXTERN_BIG : 0)
| (r_pcrel ? RELOC_STD_BITS_PCREL_BIG : 0)
| (r_baserel ? RELOC_STD_BITS_BASEREL_BIG : 0)
| (r_jmptable ? RELOC_STD_BITS_JMPTABLE_BIG : 0)
| (r_relative ? RELOC_STD_BITS_RELATIVE_BIG : 0)
| (r_length << RELOC_STD_BITS_LENGTH_SH_BIG);
}
else
{
bfd_boolean
_bfd_discard_section_stabs (bfd *abfd,
asection *stabsec,
void * psecinfo,
bfd_boolean (*reloc_symbol_deleted_p) (bfd_vma, void *),
void * cookie)
{
bfd_size_type count, amt;
struct stab_section_info *secinfo;
bfd_byte *stabbuf = NULL;
bfd_byte *sym, *symend;
bfd_size_type skip;
bfd_size_type *pstridx;
int deleting;
if (stabsec->size == 0)
/* This file does not contain stabs debugging information. */
return FALSE;
if (stabsec->size % STABSIZE != 0)
/* Something is wrong with the format of these stab symbols.
Don't try to optimize them. */
return FALSE;
if ((stabsec->output_section != NULL
&& bfd_is_abs_section (stabsec->output_section)))
/* At least one of the sections is being discarded from the
link, so we should just ignore them. */
return FALSE;
/* We should have initialized our data in _bfd_link_section_stabs.
If there was some bizarre error reading the string sections, though,
we might not have. Bail rather than asserting. */
if (psecinfo == NULL)
return FALSE;
count = stabsec->rawsize / STABSIZE;
secinfo = (struct stab_section_info *) psecinfo;
/* Read the stabs information from abfd. */
if (!bfd_malloc_and_get_section (abfd, stabsec, &stabbuf))
goto error_return;
/* Look through the stabs symbols and discard any information for
discarded functions. */
skip = 0;
deleting = -1;
symend = stabbuf + stabsec->rawsize;
for (sym = stabbuf, pstridx = secinfo->stridxs;
sym < symend;
sym += STABSIZE, ++pstridx)
{
int type;
if (*pstridx == (bfd_size_type) -1)
/* This stab was deleted in a previous pass. */
continue;
type = sym[TYPEOFF];
if (type == (int) N_FUN)
{
int strx = bfd_get_32 (abfd, sym + STRDXOFF);
if (strx == 0)
{
if (deleting)
{
skip++;
*pstridx = -1;
}
deleting = -1;
continue;
}
deleting = 0;
if ((*reloc_symbol_deleted_p) (sym + VALOFF - stabbuf, cookie))
deleting = 1;
}
if (deleting == 1)
{
*pstridx = -1;
skip++;
}
else if (deleting == -1)
{
/* Outside of a function. Check for deleted variables. */
if (type == (int) N_STSYM || type == (int) N_LCSYM)
if ((*reloc_symbol_deleted_p) (sym + VALOFF - stabbuf, cookie))
{
*pstridx = -1;
skip ++;
}
/* We should also check for N_GSYM entries which reference a
deleted global, but those are less harmful to debuggers
and would require parsing the stab strings. */
}
}
free (stabbuf);
stabbuf = NULL;
/* Shrink the stabsec as needed. */
stabsec->size -= skip * STABSIZE;
if (stabsec->size == 0)
stabsec->flags |= SEC_EXCLUDE | SEC_KEEP;
/* Recalculate the `cumulative_skips' array now that stabs have been
deleted for this section. */
if (skip != 0)
{
bfd_size_type i, offset;
bfd_size_type *pskips;
if (secinfo->cumulative_skips == NULL)
{
amt = count * sizeof (bfd_size_type);
secinfo->cumulative_skips = (bfd_size_type *) bfd_alloc (abfd, amt);
if (secinfo->cumulative_skips == NULL)
goto error_return;
}
pskips = secinfo->cumulative_skips;
pstridx = secinfo->stridxs;
offset = 0;
for (i = 0; i < count; i++, pskips++, pstridx++)
{
*pskips = offset;
if (*pstridx == (bfd_size_type) -1)
offset += STABSIZE;
}
BFD_ASSERT (offset != 0);
}
return skip > 0;
error_return:
if (stabbuf != NULL)
free (stabbuf);
return FALSE;
}
bfd_boolean
_bfd_link_section_stabs (bfd *abfd,
struct stab_info *sinfo,
asection *stabsec,
asection *stabstrsec,
void * *psecinfo,
bfd_size_type *pstring_offset)
{
bfd_boolean first;
bfd_size_type count, amt;
struct stab_section_info *secinfo;
bfd_byte *stabbuf = NULL;
bfd_byte *stabstrbuf = NULL;
bfd_byte *sym, *symend;
bfd_size_type stroff, next_stroff, skip;
bfd_size_type *pstridx;
if (stabsec->size == 0
|| stabstrsec->size == 0)
/* This file does not contain stabs debugging information. */
return TRUE;
if (stabsec->size % STABSIZE != 0)
/* Something is wrong with the format of these stab symbols.
Don't try to optimize them. */
return TRUE;
if ((stabstrsec->flags & SEC_RELOC) != 0)
/* We shouldn't see relocations in the strings, and we aren't
prepared to handle them. */
return TRUE;
if (bfd_is_abs_section (stabsec->output_section)
|| bfd_is_abs_section (stabstrsec->output_section))
/* At least one of the sections is being discarded from the
link, so we should just ignore them. */
return TRUE;
first = FALSE;
if (sinfo->stabstr == NULL)
{
flagword flags;
/* Initialize the stabs information we need to keep track of. */
first = TRUE;
sinfo->strings = _bfd_stringtab_init ();
if (sinfo->strings == NULL)
goto error_return;
/* Make sure the first byte is zero. */
(void) _bfd_stringtab_add (sinfo->strings, "", TRUE, TRUE);
if (! bfd_hash_table_init (&sinfo->includes,
stab_link_includes_newfunc,
sizeof (struct stab_link_includes_entry)))
goto error_return;
flags = (SEC_HAS_CONTENTS | SEC_READONLY | SEC_DEBUGGING
| SEC_LINKER_CREATED);
sinfo->stabstr = bfd_make_section_anyway_with_flags (abfd, ".stabstr",
flags);
if (sinfo->stabstr == NULL)
goto error_return;
}
/* Initialize the information we are going to store for this .stab
section. */
count = stabsec->size / STABSIZE;
amt = sizeof (struct stab_section_info);
amt += (count - 1) * sizeof (bfd_size_type);
*psecinfo = bfd_alloc (abfd, amt);
if (*psecinfo == NULL)
goto error_return;
secinfo = (struct stab_section_info *) *psecinfo;
secinfo->excls = NULL;
stabsec->rawsize = stabsec->size;
secinfo->cumulative_skips = NULL;
memset (secinfo->stridxs, 0, (size_t) count * sizeof (bfd_size_type));
/* Read the stabs information from abfd. */
if (!bfd_malloc_and_get_section (abfd, stabsec, &stabbuf)
|| !bfd_malloc_and_get_section (abfd, stabstrsec, &stabstrbuf))
goto error_return;
/* Look through the stabs symbols, work out the new string indices,
and identify N_BINCL symbols which can be eliminated. */
stroff = 0;
/* The stabs sections can be split when
-split-by-reloc/-split-by-file is used. We must keep track of
each stab section's place in the single concatenated string
table. */
next_stroff = pstring_offset ? *pstring_offset : 0;
skip = 0;
symend = stabbuf + stabsec->size;
for (sym = stabbuf, pstridx = secinfo->stridxs;
sym < symend;
sym += STABSIZE, ++pstridx)
{
bfd_size_type symstroff;
int type;
const char *string;
if (*pstridx != 0)
/* This symbol has already been handled by an N_BINCL pass. */
continue;
type = sym[TYPEOFF];
if (type == 0)
{
/* Special type 0 stabs indicate the offset to the next
string table. We only copy the very first one. */
stroff = next_stroff;
next_stroff += bfd_get_32 (abfd, sym + 8);
if (pstring_offset)
*pstring_offset = next_stroff;
if (! first)
{
*pstridx = (bfd_size_type) -1;
++skip;
continue;
}
first = FALSE;
}
/* Store the string in the hash table, and record the index. */
symstroff = stroff + bfd_get_32 (abfd, sym + STRDXOFF);
if (symstroff >= stabstrsec->size)
{
_bfd_error_handler
/* xgettext:c-format */
(_("%B(%A+0x%lx): Stabs entry has invalid string index."),
abfd, stabsec, (long) (sym - stabbuf));
bfd_set_error (bfd_error_bad_value);
goto error_return;
}
string = (char *) stabstrbuf + symstroff;
*pstridx = _bfd_stringtab_add (sinfo->strings, string, TRUE, TRUE);
/* An N_BINCL symbol indicates the start of the stabs entries
for a header file. We need to scan ahead to the next N_EINCL
symbol, ignoring nesting, adding up all the characters in the
symbol names, not including the file numbers in types (the
first number after an open parenthesis). */
if (type == (int) N_BINCL)
{
bfd_vma sum_chars;
bfd_vma num_chars;
bfd_vma buf_len = 0;
char * symb;
char * symb_rover;
int nest;
bfd_byte * incl_sym;
struct stab_link_includes_entry * incl_entry;
struct stab_link_includes_totals * t;
struct stab_excl_list * ne;
symb = symb_rover = NULL;
sum_chars = num_chars = 0;
nest = 0;
for (incl_sym = sym + STABSIZE;
incl_sym < symend;
incl_sym += STABSIZE)
{
int incl_type;
incl_type = incl_sym[TYPEOFF];
if (incl_type == 0)
break;
else if (incl_type == (int) N_EXCL)
continue;
else if (incl_type == (int) N_EINCL)
{
if (nest == 0)
break;
--nest;
}
else if (incl_type == (int) N_BINCL)
++nest;
else if (nest == 0)
{
const char *str;
str = ((char *) stabstrbuf
+ stroff
+ bfd_get_32 (abfd, incl_sym + STRDXOFF));
for (; *str != '\0'; str++)
{
if (num_chars >= buf_len)
{
buf_len += 32 * 1024;
symb = (char *) bfd_realloc_or_free (symb, buf_len);
if (symb == NULL)
goto error_return;
symb_rover = symb + num_chars;
}
* symb_rover ++ = * str;
sum_chars += *str;
num_chars ++;
if (*str == '(')
{
/* Skip the file number. */
++str;
while (ISDIGIT (*str))
++str;
--str;
}
}
}
}
BFD_ASSERT (num_chars == (bfd_vma) (symb_rover - symb));
/* If we have already included a header file with the same
value, then replaced this one with an N_EXCL symbol. */
incl_entry = (struct stab_link_includes_entry * )
bfd_hash_lookup (&sinfo->includes, string, TRUE, TRUE);
if (incl_entry == NULL)
goto error_return;
for (t = incl_entry->totals; t != NULL; t = t->next)
if (t->sum_chars == sum_chars
&& t->num_chars == num_chars
&& memcmp (t->symb, symb, num_chars) == 0)
break;
/* Record this symbol, so that we can set the value
correctly. */
amt = sizeof *ne;
ne = (struct stab_excl_list *) bfd_alloc (abfd, amt);
if (ne == NULL)
goto error_return;
ne->offset = sym - stabbuf;
ne->val = sum_chars;
ne->type = (int) N_BINCL;
ne->next = secinfo->excls;
secinfo->excls = ne;
if (t == NULL)
{
/* This is the first time we have seen this header file
with this set of stabs strings. */
t = (struct stab_link_includes_totals *)
bfd_hash_allocate (&sinfo->includes, sizeof *t);
if (t == NULL)
goto error_return;
t->sum_chars = sum_chars;
t->num_chars = num_chars;
/* Trim data down. */
t->symb = symb = (char *) bfd_realloc_or_free (symb, num_chars);
t->next = incl_entry->totals;
incl_entry->totals = t;
}
else
{
bfd_size_type *incl_pstridx;
/* We have seen this header file before. Tell the final
pass to change the type to N_EXCL. */
ne->type = (int) N_EXCL;
/* Free off superfluous symbols. */
free (symb);
/* Mark the skipped symbols. */
nest = 0;
for (incl_sym = sym + STABSIZE, incl_pstridx = pstridx + 1;
incl_sym < symend;
incl_sym += STABSIZE, ++incl_pstridx)
{
int incl_type;
incl_type = incl_sym[TYPEOFF];
if (incl_type == (int) N_EINCL)
{
if (nest == 0)
{
*incl_pstridx = (bfd_size_type) -1;
++skip;
break;
}
--nest;
}
else if (incl_type == (int) N_BINCL)
++nest;
else if (incl_type == (int) N_EXCL)
/* Keep existing exclusion marks. */
continue;
else if (nest == 0)
{
*incl_pstridx = (bfd_size_type) -1;
++skip;
}
}
}
}
}
free (stabbuf);
stabbuf = NULL;
free (stabstrbuf);
stabstrbuf = NULL;
/* We need to set the section sizes such that the linker will
compute the output section sizes correctly. We set the .stab
size to not include the entries we don't want. We set
SEC_EXCLUDE for the .stabstr section, so that it will be dropped
from the link. We record the size of the strtab in the first
.stabstr section we saw, and make sure we don't set SEC_EXCLUDE
for that section. */
stabsec->size = (count - skip) * STABSIZE;
if (stabsec->size == 0)
stabsec->flags |= SEC_EXCLUDE | SEC_KEEP;
stabstrsec->flags |= SEC_EXCLUDE | SEC_KEEP;
sinfo->stabstr->size = _bfd_stringtab_size (sinfo->strings);
/* Calculate the `cumulative_skips' array now that stabs have been
deleted for this section. */
if (skip != 0)
{
bfd_size_type i, offset;
bfd_size_type *pskips;
amt = count * sizeof (bfd_size_type);
secinfo->cumulative_skips = (bfd_size_type *) bfd_alloc (abfd, amt);
if (secinfo->cumulative_skips == NULL)
goto error_return;
pskips = secinfo->cumulative_skips;
pstridx = secinfo->stridxs;
offset = 0;
for (i = 0; i < count; i++, pskips++, pstridx++)
{
*pskips = offset;
if (*pstridx == (bfd_size_type) -1)
offset += STABSIZE;
}
BFD_ASSERT (offset != 0);
}
return TRUE;
error_return:
if (stabbuf != NULL)
free (stabbuf);
if (stabstrbuf != NULL)
free (stabstrbuf);
return FALSE;
}
bfd_boolean
_bfd_elf_discard_section_eh_frame
(bfd *abfd, struct bfd_link_info *info, asection *sec,
bfd_boolean (*reloc_symbol_deleted_p) (bfd_vma, void *),
struct elf_reloc_cookie *cookie)
{
#define REQUIRE(COND) \
do \
if (!(COND)) \
goto free_no_table; \
while (0)
bfd_byte *ehbuf = NULL, *buf;
bfd_byte *last_cie, *last_fde;
struct eh_cie_fde *ent, *last_cie_inf, *this_inf;
struct cie_header hdr;
struct cie cie;
struct elf_link_hash_table *htab;
struct eh_frame_hdr_info *hdr_info;
struct eh_frame_sec_info *sec_info = NULL;
unsigned int cie_usage_count, offset;
unsigned int ptr_size;
if (sec->size == 0)
{
/* This file does not contain .eh_frame information. */
return FALSE;
}
if ((sec->output_section != NULL
&& bfd_is_abs_section (sec->output_section)))
{
/* At least one of the sections is being discarded from the
link, so we should just ignore them. */
return FALSE;
}
htab = elf_hash_table (info);
hdr_info = &htab->eh_info;
/* Read the frame unwind information from abfd. */
REQUIRE (bfd_malloc_and_get_section (abfd, sec, &ehbuf));
if (sec->size >= 4
&& bfd_get_32 (abfd, ehbuf) == 0
&& cookie->rel == cookie->relend)
{
/* Empty .eh_frame section. */
free (ehbuf);
return FALSE;
}
/* If .eh_frame section size doesn't fit into int, we cannot handle
it (it would need to use 64-bit .eh_frame format anyway). */
REQUIRE (sec->size == (unsigned int) sec->size);
ptr_size = (get_elf_backend_data (abfd)
->elf_backend_eh_frame_address_size (abfd, sec));
REQUIRE (ptr_size != 0);
buf = ehbuf;
last_cie = NULL;
last_cie_inf = NULL;
memset (&cie, 0, sizeof (cie));
cie_usage_count = 0;
sec_info = bfd_zmalloc (sizeof (struct eh_frame_sec_info)
+ 99 * sizeof (struct eh_cie_fde));
REQUIRE (sec_info);
sec_info->alloced = 100;
#define ENSURE_NO_RELOCS(buf) \
REQUIRE (!(cookie->rel < cookie->relend \
&& (cookie->rel->r_offset \
< (bfd_size_type) ((buf) - ehbuf)) \
&& cookie->rel->r_info != 0))
#define SKIP_RELOCS(buf) \
while (cookie->rel < cookie->relend \
&& (cookie->rel->r_offset \
< (bfd_size_type) ((buf) - ehbuf))) \
cookie->rel++
#define GET_RELOC(buf) \
((cookie->rel < cookie->relend \
&& (cookie->rel->r_offset \
== (bfd_size_type) ((buf) - ehbuf))) \
? cookie->rel : NULL)
for (;;)
{
char *aug;
bfd_byte *start, *end, *insns;
bfd_size_type length;
if (sec_info->count == sec_info->alloced)
{
struct eh_cie_fde *old_entry = sec_info->entry;
sec_info = bfd_realloc (sec_info,
sizeof (struct eh_frame_sec_info)
+ ((sec_info->alloced + 99)
* sizeof (struct eh_cie_fde)));
REQUIRE (sec_info);
memset (&sec_info->entry[sec_info->alloced], 0,
100 * sizeof (struct eh_cie_fde));
sec_info->alloced += 100;
/* Now fix any pointers into the array. */
if (last_cie_inf >= old_entry
&& last_cie_inf < old_entry + sec_info->count)
last_cie_inf = sec_info->entry + (last_cie_inf - old_entry);
}
this_inf = sec_info->entry + sec_info->count;
last_fde = buf;
/* If we are at the end of the section, we still need to decide
on whether to output or discard last encountered CIE (if any). */
if ((bfd_size_type) (buf - ehbuf) == sec->size)
{
hdr.length = 0;
hdr.id = (unsigned int) -1;
end = buf;
}
else
{
/* Read the length of the entry. */
REQUIRE (skip_bytes (&buf, ehbuf + sec->size, 4));
hdr.length = bfd_get_32 (abfd, buf - 4);
/* 64-bit .eh_frame is not supported. */
REQUIRE (hdr.length != 0xffffffff);
/* The CIE/FDE must be fully contained in this input section. */
REQUIRE ((bfd_size_type) (buf - ehbuf) + hdr.length <= sec->size);
end = buf + hdr.length;
this_inf->offset = last_fde - ehbuf;
this_inf->size = 4 + hdr.length;
if (hdr.length == 0)
{
/* A zero-length CIE should only be found at the end of
the section. */
REQUIRE ((bfd_size_type) (buf - ehbuf) == sec->size);
ENSURE_NO_RELOCS (buf);
sec_info->count++;
/* Now just finish last encountered CIE processing and break
the loop. */
hdr.id = (unsigned int) -1;
}
else
{
REQUIRE (skip_bytes (&buf, end, 4));
hdr.id = bfd_get_32 (abfd, buf - 4);
REQUIRE (hdr.id != (unsigned int) -1);
}
}
if (hdr.id == 0 || hdr.id == (unsigned int) -1)
{
unsigned int initial_insn_length;
/* CIE */
if (last_cie != NULL)
{
/* Now check if this CIE is identical to the last CIE,
in which case we can remove it provided we adjust
all FDEs. Also, it can be removed if we have removed
all FDEs using it. */
if ((!info->relocatable
&& hdr_info->last_cie_sec
&& (sec->output_section
== hdr_info->last_cie_sec->output_section)
&& cie_compare (&cie, &hdr_info->last_cie) == 0)
|| cie_usage_count == 0)
last_cie_inf->removed = 1;
else
{
hdr_info->last_cie = cie;
hdr_info->last_cie_sec = sec;
last_cie_inf->make_relative = cie.make_relative;
last_cie_inf->make_lsda_relative = cie.make_lsda_relative;
last_cie_inf->per_encoding_relative
= (cie.per_encoding & 0x70) == DW_EH_PE_pcrel;
}
}
if (hdr.id == (unsigned int) -1)
break;
last_cie_inf = this_inf;
this_inf->cie = 1;
cie_usage_count = 0;
memset (&cie, 0, sizeof (cie));
cie.hdr = hdr;
REQUIRE (read_byte (&buf, end, &cie.version));
/* Cannot handle unknown versions. */
REQUIRE (cie.version == 1 || cie.version == 3);
REQUIRE (strlen ((char *) buf) < sizeof (cie.augmentation));
strcpy (cie.augmentation, (char *) buf);
buf = (bfd_byte *) strchr ((char *) buf, '\0') + 1;
ENSURE_NO_RELOCS (buf);
if (buf[0] == 'e' && buf[1] == 'h')
{
/* GCC < 3.0 .eh_frame CIE */
/* We cannot merge "eh" CIEs because __EXCEPTION_TABLE__
is private to each CIE, so we don't need it for anything.
Just skip it. */
REQUIRE (skip_bytes (&buf, end, ptr_size));
SKIP_RELOCS (buf);
}
REQUIRE (read_uleb128 (&buf, end, &cie.code_align));
REQUIRE (read_sleb128 (&buf, end, &cie.data_align));
if (cie.version == 1)
{
REQUIRE (buf < end);
cie.ra_column = *buf++;
}
else
REQUIRE (read_uleb128 (&buf, end, &cie.ra_column));
ENSURE_NO_RELOCS (buf);
cie.lsda_encoding = DW_EH_PE_omit;
cie.fde_encoding = DW_EH_PE_omit;
cie.per_encoding = DW_EH_PE_omit;
aug = cie.augmentation;
if (aug[0] != 'e' || aug[1] != 'h')
{
if (*aug == 'z')
{
aug++;
REQUIRE (read_uleb128 (&buf, end, &cie.augmentation_size));
ENSURE_NO_RELOCS (buf);
}
while (*aug != '\0')
switch (*aug++)
{
case 'L':
REQUIRE (read_byte (&buf, end, &cie.lsda_encoding));
ENSURE_NO_RELOCS (buf);
REQUIRE (get_DW_EH_PE_width (cie.lsda_encoding, ptr_size));
break;
case 'R':
REQUIRE (read_byte (&buf, end, &cie.fde_encoding));
ENSURE_NO_RELOCS (buf);
REQUIRE (get_DW_EH_PE_width (cie.fde_encoding, ptr_size));
break;
case 'P':
{
int per_width;
REQUIRE (read_byte (&buf, end, &cie.per_encoding));
per_width = get_DW_EH_PE_width (cie.per_encoding,
ptr_size);
REQUIRE (per_width);
if ((cie.per_encoding & 0xf0) == DW_EH_PE_aligned)
{
length = -(buf - ehbuf) & (per_width - 1);
REQUIRE (skip_bytes (&buf, end, length));
}
ENSURE_NO_RELOCS (buf);
/* Ensure we have a reloc here, against
a global symbol. */
if (GET_RELOC (buf) != NULL)
{
unsigned long r_symndx;
#ifdef BFD64
if (ptr_size == 8)
r_symndx = ELF64_R_SYM (cookie->rel->r_info);
else
#endif
r_symndx = ELF32_R_SYM (cookie->rel->r_info);
if (r_symndx >= cookie->locsymcount)
{
struct elf_link_hash_entry *h;
r_symndx -= cookie->extsymoff;
h = cookie->sym_hashes[r_symndx];
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;
cie.personality = h;
}
/* Cope with MIPS-style composite relocations. */
do
cookie->rel++;
while (GET_RELOC (buf) != NULL);
}
REQUIRE (skip_bytes (&buf, end, per_width));
}
break;
default:
/* Unrecognized augmentation. Better bail out. */
goto free_no_table;
}
}
/* For shared libraries, try to get rid of as many RELATIVE relocs
as possible. */
if (info->shared
&& (get_elf_backend_data (abfd)
->elf_backend_can_make_relative_eh_frame
(abfd, info, sec)))
{
if ((cie.fde_encoding & 0xf0) == DW_EH_PE_absptr)
cie.make_relative = 1;
/* If the CIE doesn't already have an 'R' entry, it's fairly
easy to add one, provided that there's no aligned data
after the augmentation string. */
else if (cie.fde_encoding == DW_EH_PE_omit
&& (cie.per_encoding & 0xf0) != DW_EH_PE_aligned)
{
if (*cie.augmentation == 0)
this_inf->add_augmentation_size = 1;
this_inf->add_fde_encoding = 1;
cie.make_relative = 1;
}
}
if (info->shared
&& (get_elf_backend_data (abfd)
->elf_backend_can_make_lsda_relative_eh_frame
(abfd, info, sec))
&& (cie.lsda_encoding & 0xf0) == DW_EH_PE_absptr)
cie.make_lsda_relative = 1;
/* If FDE encoding was not specified, it defaults to
DW_EH_absptr. */
if (cie.fde_encoding == DW_EH_PE_omit)
cie.fde_encoding = DW_EH_PE_absptr;
initial_insn_length = end - buf;
if (initial_insn_length <= 50)
{
cie.initial_insn_length = initial_insn_length;
memcpy (cie.initial_instructions, buf, initial_insn_length);
}
insns = buf;
buf += initial_insn_length;
ENSURE_NO_RELOCS (buf);
last_cie = last_fde;
}
else
{
/* Ensure this FDE uses the last CIE encountered. */
REQUIRE (last_cie);
REQUIRE (hdr.id == (unsigned int) (buf - 4 - last_cie));
ENSURE_NO_RELOCS (buf);
REQUIRE (GET_RELOC (buf));
if ((*reloc_symbol_deleted_p) (buf - ehbuf, cookie))
/* This is a FDE against a discarded section. It should
be deleted. */
this_inf->removed = 1;
else
{
if (info->shared
&& (((cie.fde_encoding & 0xf0) == DW_EH_PE_absptr
&& cie.make_relative == 0)
|| (cie.fde_encoding & 0xf0) == DW_EH_PE_aligned))
{
/* If a shared library uses absolute pointers
which we cannot turn into PC relative,
don't create the binary search table,
since it is affected by runtime relocations. */
hdr_info->table = FALSE;
}
cie_usage_count++;
hdr_info->fde_count++;
}
/* Skip the initial location and address range. */
start = buf;
length = get_DW_EH_PE_width (cie.fde_encoding, ptr_size);
REQUIRE (skip_bytes (&buf, end, 2 * length));
/* Skip the augmentation size, if present. */
if (cie.augmentation[0] == 'z')
REQUIRE (read_uleb128 (&buf, end, &length));
else
length = 0;
/* Of the supported augmentation characters above, only 'L'
adds augmentation data to the FDE. This code would need to
be adjusted if any future augmentations do the same thing. */
if (cie.lsda_encoding != DW_EH_PE_omit)
{
this_inf->lsda_offset = buf - start;
/* If there's no 'z' augmentation, we don't know where the
CFA insns begin. Assume no padding. */
if (cie.augmentation[0] != 'z')
length = end - buf;
}
/* Skip over the augmentation data. */
REQUIRE (skip_bytes (&buf, end, length));
insns = buf;
buf = last_fde + 4 + hdr.length;
SKIP_RELOCS (buf);
}
/* Try to interpret the CFA instructions and find the first
padding nop. Shrink this_inf's size so that it doesn't
including the padding. */
length = get_DW_EH_PE_width (cie.fde_encoding, ptr_size);
insns = skip_non_nops (insns, end, length);
if (insns != 0)
this_inf->size -= end - insns;
this_inf->fde_encoding = cie.fde_encoding;
this_inf->lsda_encoding = cie.lsda_encoding;
sec_info->count++;
}
elf_section_data (sec)->sec_info = sec_info;
sec->sec_info_type = ELF_INFO_TYPE_EH_FRAME;
/* Ok, now we can assign new offsets. */
offset = 0;
last_cie_inf = hdr_info->last_cie_inf;
for (ent = sec_info->entry; ent < sec_info->entry + sec_info->count; ++ent)
if (!ent->removed)
{
if (ent->cie)
last_cie_inf = ent;
else
ent->cie_inf = last_cie_inf;
ent->new_offset = offset;
offset += size_of_output_cie_fde (ent, ptr_size);
}
hdr_info->last_cie_inf = last_cie_inf;
/* Resize the sec as needed. */
sec->rawsize = sec->size;
sec->size = offset;
if (sec->size == 0)
sec->flags |= SEC_EXCLUDE;
free (ehbuf);
return offset != sec->rawsize;
free_no_table:
if (ehbuf)
free (ehbuf);
if (sec_info)
free (sec_info);
hdr_info->table = FALSE;
hdr_info->last_cie.hdr.length = 0;
return FALSE;
#undef REQUIRE
}
void
_bfd_elf_parse_eh_frame (bfd *abfd, struct bfd_link_info *info,
asection *sec, struct elf_reloc_cookie *cookie)
{
#define REQUIRE(COND) \
do \
if (!(COND)) \
goto free_no_table; \
while (0)
bfd_byte *ehbuf = NULL, *buf, *end;
bfd_byte *last_fde;
struct eh_cie_fde *this_inf;
unsigned int hdr_length, hdr_id;
unsigned int cie_count;
struct cie *cie, *local_cies = NULL;
struct elf_link_hash_table *htab;
struct eh_frame_hdr_info *hdr_info;
struct eh_frame_sec_info *sec_info = NULL;
unsigned int ptr_size;
unsigned int num_cies;
unsigned int num_entries;
elf_gc_mark_hook_fn gc_mark_hook;
htab = elf_hash_table (info);
hdr_info = &htab->eh_info;
if (hdr_info->parsed_eh_frames)
return;
if (sec->size == 0)
{
/* This file does not contain .eh_frame information. */
return;
}
if (bfd_is_abs_section (sec->output_section))
{
/* At least one of the sections is being discarded from the
link, so we should just ignore them. */
return;
}
/* Read the frame unwind information from abfd. */
REQUIRE (bfd_malloc_and_get_section (abfd, sec, &ehbuf));
if (sec->size >= 4
&& bfd_get_32 (abfd, ehbuf) == 0
&& cookie->rel == cookie->relend)
{
/* Empty .eh_frame section. */
free (ehbuf);
return;
}
/* If .eh_frame section size doesn't fit into int, we cannot handle
it (it would need to use 64-bit .eh_frame format anyway). */
REQUIRE (sec->size == (unsigned int) sec->size);
ptr_size = (get_elf_backend_data (abfd)
->elf_backend_eh_frame_address_size (abfd, sec));
REQUIRE (ptr_size != 0);
/* Go through the section contents and work out how many FDEs and
CIEs there are. */
buf = ehbuf;
end = ehbuf + sec->size;
num_cies = 0;
num_entries = 0;
while (buf != end)
{
num_entries++;
/* Read the length of the entry. */
REQUIRE (skip_bytes (&buf, end, 4));
hdr_length = bfd_get_32 (abfd, buf - 4);
/* 64-bit .eh_frame is not supported. */
REQUIRE (hdr_length != 0xffffffff);
if (hdr_length == 0)
break;
REQUIRE (skip_bytes (&buf, end, 4));
hdr_id = bfd_get_32 (abfd, buf - 4);
if (hdr_id == 0)
num_cies++;
REQUIRE (skip_bytes (&buf, end, hdr_length - 4));
}
sec_info = bfd_zmalloc (sizeof (struct eh_frame_sec_info)
+ (num_entries - 1) * sizeof (struct eh_cie_fde));
REQUIRE (sec_info);
/* We need to have a "struct cie" for each CIE in this section. */
local_cies = bfd_zmalloc (num_cies * sizeof (*local_cies));
REQUIRE (local_cies);
#define ENSURE_NO_RELOCS(buf) \
REQUIRE (!(cookie->rel < cookie->relend \
&& (cookie->rel->r_offset \
< (bfd_size_type) ((buf) - ehbuf)) \
&& cookie->rel->r_info != 0))
#define SKIP_RELOCS(buf) \
while (cookie->rel < cookie->relend \
&& (cookie->rel->r_offset \
< (bfd_size_type) ((buf) - ehbuf))) \
cookie->rel++
#define GET_RELOC(buf) \
((cookie->rel < cookie->relend \
&& (cookie->rel->r_offset \
== (bfd_size_type) ((buf) - ehbuf))) \
? cookie->rel : NULL)
buf = ehbuf;
cie_count = 0;
gc_mark_hook = get_elf_backend_data (abfd)->gc_mark_hook;
while ((bfd_size_type) (buf - ehbuf) != sec->size)
{
char *aug;
bfd_byte *start, *insns, *insns_end;
bfd_size_type length;
unsigned int set_loc_count;
this_inf = sec_info->entry + sec_info->count;
last_fde = buf;
/* Read the length of the entry. */
REQUIRE (skip_bytes (&buf, ehbuf + sec->size, 4));
hdr_length = bfd_get_32 (abfd, buf - 4);
/* The CIE/FDE must be fully contained in this input section. */
REQUIRE ((bfd_size_type) (buf - ehbuf) + hdr_length <= sec->size);
end = buf + hdr_length;
this_inf->offset = last_fde - ehbuf;
this_inf->size = 4 + hdr_length;
this_inf->reloc_index = cookie->rel - cookie->rels;
if (hdr_length == 0)
{
/* A zero-length CIE should only be found at the end of
the section. */
REQUIRE ((bfd_size_type) (buf - ehbuf) == sec->size);
ENSURE_NO_RELOCS (buf);
sec_info->count++;
break;
}
REQUIRE (skip_bytes (&buf, end, 4));
hdr_id = bfd_get_32 (abfd, buf - 4);
if (hdr_id == 0)
{
unsigned int initial_insn_length;
/* CIE */
this_inf->cie = 1;
/* Point CIE to one of the section-local cie structures. */
cie = local_cies + cie_count++;
cie->cie_inf = this_inf;
cie->length = hdr_length;
cie->output_sec = sec->output_section;
start = buf;
REQUIRE (read_byte (&buf, end, &cie->version));
/* Cannot handle unknown versions. */
REQUIRE (cie->version == 1 || cie->version == 3);
REQUIRE (strlen ((char *) buf) < sizeof (cie->augmentation));
strcpy (cie->augmentation, (char *) buf);
buf = (bfd_byte *) strchr ((char *) buf, '\0') + 1;
ENSURE_NO_RELOCS (buf);
if (buf[0] == 'e' && buf[1] == 'h')
{
/* GCC < 3.0 .eh_frame CIE */
/* We cannot merge "eh" CIEs because __EXCEPTION_TABLE__
is private to each CIE, so we don't need it for anything.
Just skip it. */
REQUIRE (skip_bytes (&buf, end, ptr_size));
SKIP_RELOCS (buf);
}
REQUIRE (read_uleb128 (&buf, end, &cie->code_align));
REQUIRE (read_sleb128 (&buf, end, &cie->data_align));
if (cie->version == 1)
{
REQUIRE (buf < end);
cie->ra_column = *buf++;
}
else
REQUIRE (read_uleb128 (&buf, end, &cie->ra_column));
ENSURE_NO_RELOCS (buf);
cie->lsda_encoding = DW_EH_PE_omit;
cie->fde_encoding = DW_EH_PE_omit;
cie->per_encoding = DW_EH_PE_omit;
aug = cie->augmentation;
if (aug[0] != 'e' || aug[1] != 'h')
{
if (*aug == 'z')
{
aug++;
REQUIRE (read_uleb128 (&buf, end, &cie->augmentation_size));
ENSURE_NO_RELOCS (buf);
}
while (*aug != '\0')
switch (*aug++)
{
case 'L':
REQUIRE (read_byte (&buf, end, &cie->lsda_encoding));
ENSURE_NO_RELOCS (buf);
REQUIRE (get_DW_EH_PE_width (cie->lsda_encoding, ptr_size));
break;
case 'R':
REQUIRE (read_byte (&buf, end, &cie->fde_encoding));
ENSURE_NO_RELOCS (buf);
REQUIRE (get_DW_EH_PE_width (cie->fde_encoding, ptr_size));
break;
case 'S':
break;
case 'P':
{
int per_width;
REQUIRE (read_byte (&buf, end, &cie->per_encoding));
per_width = get_DW_EH_PE_width (cie->per_encoding,
ptr_size);
REQUIRE (per_width);
if ((cie->per_encoding & 0xf0) == DW_EH_PE_aligned)
{
length = -(buf - ehbuf) & (per_width - 1);
REQUIRE (skip_bytes (&buf, end, length));
}
ENSURE_NO_RELOCS (buf);
/* Ensure we have a reloc here. */
REQUIRE (GET_RELOC (buf));
cie->personality.reloc_index
= cookie->rel - cookie->rels;
/* Cope with MIPS-style composite relocations. */
do
cookie->rel++;
while (GET_RELOC (buf) != NULL);
REQUIRE (skip_bytes (&buf, end, per_width));
}
break;
default:
/* Unrecognized augmentation. Better bail out. */
goto free_no_table;
}
}
/* For shared libraries, try to get rid of as many RELATIVE relocs
as possible. */
if (info->shared
&& (get_elf_backend_data (abfd)
->elf_backend_can_make_relative_eh_frame
(abfd, info, sec)))
{
if ((cie->fde_encoding & 0xf0) == DW_EH_PE_absptr)
this_inf->make_relative = 1;
/* If the CIE doesn't already have an 'R' entry, it's fairly
easy to add one, provided that there's no aligned data
after the augmentation string. */
else if (cie->fde_encoding == DW_EH_PE_omit
&& (cie->per_encoding & 0xf0) != DW_EH_PE_aligned)
{
if (*cie->augmentation == 0)
this_inf->add_augmentation_size = 1;
this_inf->u.cie.add_fde_encoding = 1;
this_inf->make_relative = 1;
}
}
if (info->shared
&& (get_elf_backend_data (abfd)
->elf_backend_can_make_lsda_relative_eh_frame
(abfd, info, sec))
&& (cie->lsda_encoding & 0xf0) == DW_EH_PE_absptr)
cie->can_make_lsda_relative = 1;
/* If FDE encoding was not specified, it defaults to
DW_EH_absptr. */
if (cie->fde_encoding == DW_EH_PE_omit)
cie->fde_encoding = DW_EH_PE_absptr;
initial_insn_length = end - buf;
if (initial_insn_length <= sizeof (cie->initial_instructions))
{
cie->initial_insn_length = initial_insn_length;
memcpy (cie->initial_instructions, buf, initial_insn_length);
}
insns = buf;
buf += initial_insn_length;
ENSURE_NO_RELOCS (buf);
if (hdr_info->merge_cies)
this_inf->u.cie.u.full_cie = cie;
this_inf->u.cie.per_encoding_relative
= (cie->per_encoding & 0x70) == DW_EH_PE_pcrel;
}
else
{
asection *rsec;
/* Find the corresponding CIE. */
unsigned int cie_offset = this_inf->offset + 4 - hdr_id;
for (cie = local_cies; cie < local_cies + cie_count; cie++)
if (cie_offset == cie->cie_inf->offset)
break;
/* Ensure this FDE references one of the CIEs in this input
section. */
REQUIRE (cie != local_cies + cie_count);
this_inf->u.fde.cie_inf = cie->cie_inf;
this_inf->make_relative = cie->cie_inf->make_relative;
this_inf->add_augmentation_size
= cie->cie_inf->add_augmentation_size;
ENSURE_NO_RELOCS (buf);
REQUIRE (GET_RELOC (buf));
/* Chain together the FDEs for each section. */
rsec = _bfd_elf_gc_mark_rsec (info, sec, gc_mark_hook, cookie);
/* RSEC will be NULL if FDE was cleared out as it was belonging to
a discarded SHT_GROUP. */
if (rsec)
{
REQUIRE (rsec->owner == abfd);
this_inf->u.fde.next_for_section = elf_fde_list (rsec);
elf_fde_list (rsec) = this_inf;
}
/* Skip the initial location and address range. */
start = buf;
length = get_DW_EH_PE_width (cie->fde_encoding, ptr_size);
REQUIRE (skip_bytes (&buf, end, 2 * length));
/* Skip the augmentation size, if present. */
if (cie->augmentation[0] == 'z')
REQUIRE (read_uleb128 (&buf, end, &length));
else
length = 0;
/* Of the supported augmentation characters above, only 'L'
adds augmentation data to the FDE. This code would need to
be adjusted if any future augmentations do the same thing. */
if (cie->lsda_encoding != DW_EH_PE_omit)
{
SKIP_RELOCS (buf);
if (cie->can_make_lsda_relative && GET_RELOC (buf))
cie->cie_inf->u.cie.make_lsda_relative = 1;
this_inf->lsda_offset = buf - start;
/* If there's no 'z' augmentation, we don't know where the
CFA insns begin. Assume no padding. */
if (cie->augmentation[0] != 'z')
length = end - buf;
}
/* Skip over the augmentation data. */
REQUIRE (skip_bytes (&buf, end, length));
insns = buf;
buf = last_fde + 4 + hdr_length;
/* For NULL RSEC (cleared FDE belonging to a discarded section)
the relocations are commonly cleared. We do not sanity check if
all these relocations are cleared as (1) relocations to
.gcc_except_table will remain uncleared (they will get dropped
with the drop of this unused FDE) and (2) BFD already safely drops
relocations of any type to .eh_frame by
elf_section_ignore_discarded_relocs.
TODO: The .gcc_except_table entries should be also filtered as
.eh_frame entries; or GCC could rather use COMDAT for them. */
SKIP_RELOCS (buf);
}
/* Try to interpret the CFA instructions and find the first
padding nop. Shrink this_inf's size so that it doesn't
include the padding. */
length = get_DW_EH_PE_width (cie->fde_encoding, ptr_size);
set_loc_count = 0;
insns_end = skip_non_nops (insns, end, length, &set_loc_count);
/* If we don't understand the CFA instructions, we can't know
what needs to be adjusted there. */
if (insns_end == NULL
/* For the time being we don't support DW_CFA_set_loc in
CIE instructions. */
|| (set_loc_count && this_inf->cie))
goto free_no_table;
this_inf->size -= end - insns_end;
if (insns_end != end && this_inf->cie)
{
cie->initial_insn_length -= end - insns_end;
cie->length -= end - insns_end;
}
if (set_loc_count
&& ((cie->fde_encoding & 0xf0) == DW_EH_PE_pcrel
|| this_inf->make_relative))
{
unsigned int cnt;
bfd_byte *p;
this_inf->set_loc = bfd_malloc ((set_loc_count + 1)
* sizeof (unsigned int));
REQUIRE (this_inf->set_loc);
this_inf->set_loc[0] = set_loc_count;
p = insns;
cnt = 0;
while (p < end)
{
if (*p == DW_CFA_set_loc)
this_inf->set_loc[++cnt] = p + 1 - start;
REQUIRE (skip_cfa_op (&p, end, length));
}
}
this_inf->removed = 1;
this_inf->fde_encoding = cie->fde_encoding;
this_inf->lsda_encoding = cie->lsda_encoding;
sec_info->count++;
}
BFD_ASSERT (sec_info->count == num_entries);
BFD_ASSERT (cie_count == num_cies);
elf_section_data (sec)->sec_info = sec_info;
sec->sec_info_type = ELF_INFO_TYPE_EH_FRAME;
if (hdr_info->merge_cies)
{
sec_info->cies = local_cies;
local_cies = NULL;
}
goto success;
free_no_table:
(*info->callbacks->einfo)
(_("%P: error in %B(%A); no .eh_frame_hdr table will be created.\n"),
abfd, sec);
hdr_info->table = FALSE;
if (sec_info)
free (sec_info);
success:
if (ehbuf)
free (ehbuf);
if (local_cies)
free (local_cies);
#undef REQUIRE
}
bfd_boolean
_bfd_elf_discard_section_eh_frame
(bfd *abfd, struct bfd_link_info *info, asection *sec,
bfd_boolean (*reloc_symbol_deleted_p) (bfd_vma, void *),
struct elf_reloc_cookie *cookie)
{
bfd_byte *ehbuf = NULL, *buf;
bfd_byte *last_cie, *last_fde;
struct cie_header hdr;
struct cie cie;
struct elf_link_hash_table *htab;
struct eh_frame_hdr_info *hdr_info;
struct eh_frame_sec_info *sec_info = NULL;
unsigned int leb128_tmp;
unsigned int cie_usage_count, last_cie_ndx, i, offset;
unsigned int make_relative, make_lsda_relative;
bfd_size_type new_size;
unsigned int ptr_size;
if (sec->_raw_size == 0)
{
/* This file does not contain .eh_frame information. */
return FALSE;
}
if ((sec->output_section != NULL
&& bfd_is_abs_section (sec->output_section)))
{
/* At least one of the sections is being discarded from the
link, so we should just ignore them. */
return FALSE;
}
htab = elf_hash_table (info);
hdr_info = &htab->eh_info;
/* Read the frame unwind information from abfd. */
ehbuf = bfd_malloc (sec->_raw_size);
if (ehbuf == NULL)
goto free_no_table;
if (! bfd_get_section_contents (abfd, sec, ehbuf, 0, sec->_raw_size))
goto free_no_table;
if (sec->_raw_size >= 4
&& bfd_get_32 (abfd, ehbuf) == 0
&& cookie->rel == cookie->relend)
{
/* Empty .eh_frame section. */
free (ehbuf);
return FALSE;
}
/* If .eh_frame section size doesn't fit into int, we cannot handle
it (it would need to use 64-bit .eh_frame format anyway). */
if (sec->_raw_size != (unsigned int) sec->_raw_size)
goto free_no_table;
ptr_size = (elf_elfheader (abfd)->e_ident[EI_CLASS]
== ELFCLASS64) ? 8 : 4;
buf = ehbuf;
last_cie = NULL;
last_cie_ndx = 0;
memset (&cie, 0, sizeof (cie));
cie_usage_count = 0;
new_size = sec->_raw_size;
make_relative = hdr_info->last_cie.make_relative;
make_lsda_relative = hdr_info->last_cie.make_lsda_relative;
sec_info = bfd_zmalloc (sizeof (struct eh_frame_sec_info)
+ 99 * sizeof (struct eh_cie_fde));
if (sec_info == NULL)
goto free_no_table;
sec_info->alloced = 100;
#define ENSURE_NO_RELOCS(buf) \
if (cookie->rel < cookie->relend \
&& (cookie->rel->r_offset \
< (bfd_size_type) ((buf) - ehbuf)) \
&& cookie->rel->r_info != 0) \
goto free_no_table
#define SKIP_RELOCS(buf) \
while (cookie->rel < cookie->relend \
&& (cookie->rel->r_offset \
< (bfd_size_type) ((buf) - ehbuf))) \
cookie->rel++
#define GET_RELOC(buf) \
((cookie->rel < cookie->relend \
&& (cookie->rel->r_offset \
== (bfd_size_type) ((buf) - ehbuf))) \
? cookie->rel : NULL)
for (;;)
{
unsigned char *aug;
if (sec_info->count == sec_info->alloced)
{
sec_info = bfd_realloc (sec_info,
sizeof (struct eh_frame_sec_info)
+ (sec_info->alloced + 99)
* sizeof (struct eh_cie_fde));
if (sec_info == NULL)
goto free_no_table;
memset (&sec_info->entry[sec_info->alloced], 0,
100 * sizeof (struct eh_cie_fde));
sec_info->alloced += 100;
}
last_fde = buf;
/* If we are at the end of the section, we still need to decide
on whether to output or discard last encountered CIE (if any). */
if ((bfd_size_type) (buf - ehbuf) == sec->_raw_size)
hdr.id = (unsigned int) -1;
else
{
if ((bfd_size_type) (buf + 4 - ehbuf) > sec->_raw_size)
/* No space for CIE/FDE header length. */
goto free_no_table;
hdr.length = bfd_get_32 (abfd, buf);
if (hdr.length == 0xffffffff)
/* 64-bit .eh_frame is not supported. */
goto free_no_table;
buf += 4;
if ((bfd_size_type) (buf - ehbuf) + hdr.length > sec->_raw_size)
/* CIE/FDE not contained fully in this .eh_frame input section. */
goto free_no_table;
sec_info->entry[sec_info->count].offset = last_fde - ehbuf;
sec_info->entry[sec_info->count].size = 4 + hdr.length;
if (hdr.length == 0)
{
/* CIE with length 0 must be only the last in the section. */
if ((bfd_size_type) (buf - ehbuf) < sec->_raw_size)
goto free_no_table;
ENSURE_NO_RELOCS (buf);
sec_info->count++;
/* Now just finish last encountered CIE processing and break
the loop. */
hdr.id = (unsigned int) -1;
}
else
{
hdr.id = bfd_get_32 (abfd, buf);
buf += 4;
if (hdr.id == (unsigned int) -1)
goto free_no_table;
}
}
if (hdr.id == 0 || hdr.id == (unsigned int) -1)
{
unsigned int initial_insn_length;
/* CIE */
if (last_cie != NULL)
{
/* Now check if this CIE is identical to the last CIE,
in which case we can remove it provided we adjust
all FDEs. Also, it can be removed if we have removed
all FDEs using it. */
if ((!info->relocatable
&& hdr_info->last_cie_sec
&& (sec->output_section
== hdr_info->last_cie_sec->output_section)
&& cie_compare (&cie, &hdr_info->last_cie) == 0)
|| cie_usage_count == 0)
{
new_size -= cie.hdr.length + 4;
sec_info->entry[last_cie_ndx].removed = 1;
sec_info->entry[last_cie_ndx].sec = hdr_info->last_cie_sec;
sec_info->entry[last_cie_ndx].new_offset
= hdr_info->last_cie_offset;
}
else
{
hdr_info->last_cie = cie;
hdr_info->last_cie_sec = sec;
hdr_info->last_cie_offset = last_cie - ehbuf;
sec_info->entry[last_cie_ndx].make_relative
= cie.make_relative;
sec_info->entry[last_cie_ndx].make_lsda_relative
= cie.make_lsda_relative;
sec_info->entry[last_cie_ndx].per_encoding_relative
= (cie.per_encoding & 0x70) == DW_EH_PE_pcrel;
}
}
if (hdr.id == (unsigned int) -1)
break;
last_cie_ndx = sec_info->count;
sec_info->entry[sec_info->count].cie = 1;
cie_usage_count = 0;
memset (&cie, 0, sizeof (cie));
cie.hdr = hdr;
cie.version = *buf++;
/* Cannot handle unknown versions. */
if (cie.version != 1)
goto free_no_table;
if (strlen (buf) > sizeof (cie.augmentation) - 1)
goto free_no_table;
strcpy (cie.augmentation, buf);
buf = strchr (buf, '\0') + 1;
ENSURE_NO_RELOCS (buf);
if (buf[0] == 'e' && buf[1] == 'h')
{
/* GCC < 3.0 .eh_frame CIE */
/* We cannot merge "eh" CIEs because __EXCEPTION_TABLE__
is private to each CIE, so we don't need it for anything.
Just skip it. */
buf += ptr_size;
SKIP_RELOCS (buf);
}
read_uleb128 (cie.code_align, buf);
read_sleb128 (cie.data_align, buf);
/* Note - in DWARF2 the return address column is an unsigned byte.
In DWARF3 it is a ULEB128. We are following DWARF3. For most
ports this will not matter as the value will be less than 128.
For the others (eg FRV, SH, MMIX, IA64) they need a fixed GCC
which conforms to the DWARF3 standard. */
read_uleb128 (cie.ra_column, buf);
ENSURE_NO_RELOCS (buf);
cie.lsda_encoding = DW_EH_PE_omit;
cie.fde_encoding = DW_EH_PE_omit;
cie.per_encoding = DW_EH_PE_omit;
aug = cie.augmentation;
if (aug[0] != 'e' || aug[1] != 'h')
{
if (*aug == 'z')
{
aug++;
read_uleb128 (cie.augmentation_size, buf);
ENSURE_NO_RELOCS (buf);
}
while (*aug != '\0')
switch (*aug++)
{
case 'L':
cie.lsda_encoding = *buf++;
ENSURE_NO_RELOCS (buf);
if (get_DW_EH_PE_width (cie.lsda_encoding, ptr_size) == 0)
goto free_no_table;
break;
case 'R':
cie.fde_encoding = *buf++;
ENSURE_NO_RELOCS (buf);
if (get_DW_EH_PE_width (cie.fde_encoding, ptr_size) == 0)
goto free_no_table;
break;
case 'P':
{
int per_width;
cie.per_encoding = *buf++;
per_width = get_DW_EH_PE_width (cie.per_encoding,
ptr_size);
if (per_width == 0)
goto free_no_table;
if ((cie.per_encoding & 0xf0) == DW_EH_PE_aligned)
buf = (ehbuf
+ ((buf - ehbuf + per_width - 1)
& ~((bfd_size_type) per_width - 1)));
ENSURE_NO_RELOCS (buf);
/* Ensure we have a reloc here, against
a global symbol. */
if (GET_RELOC (buf) != NULL)
{
unsigned long r_symndx;
#ifdef BFD64
if (ptr_size == 8)
r_symndx = ELF64_R_SYM (cookie->rel->r_info);
else
#endif
r_symndx = ELF32_R_SYM (cookie->rel->r_info);
if (r_symndx >= cookie->locsymcount)
{
struct elf_link_hash_entry *h;
r_symndx -= cookie->extsymoff;
h = cookie->sym_hashes[r_symndx];
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;
cie.personality = h;
}
cookie->rel++;
}
buf += per_width;
}
break;
default:
/* Unrecognized augmentation. Better bail out. */
goto free_no_table;
}
}
/* For shared libraries, try to get rid of as many RELATIVE relocs
as possible. */
if (info->shared
&& (get_elf_backend_data (abfd)
->elf_backend_can_make_relative_eh_frame
(abfd, info, sec))
&& (cie.fde_encoding & 0xf0) == DW_EH_PE_absptr)
cie.make_relative = 1;
if (info->shared
&& (get_elf_backend_data (abfd)
->elf_backend_can_make_lsda_relative_eh_frame
(abfd, info, sec))
&& (cie.lsda_encoding & 0xf0) == DW_EH_PE_absptr)
cie.make_lsda_relative = 1;
/* If FDE encoding was not specified, it defaults to
DW_EH_absptr. */
if (cie.fde_encoding == DW_EH_PE_omit)
cie.fde_encoding = DW_EH_PE_absptr;
initial_insn_length = cie.hdr.length - (buf - last_fde - 4);
if (initial_insn_length <= 50)
{
cie.initial_insn_length = initial_insn_length;
memcpy (cie.initial_instructions, buf, initial_insn_length);
}
buf += initial_insn_length;
ENSURE_NO_RELOCS (buf);
last_cie = last_fde;
}
else
{
/* Ensure this FDE uses the last CIE encountered. */
if (last_cie == NULL
|| hdr.id != (unsigned int) (buf - 4 - last_cie))
goto free_no_table;
ENSURE_NO_RELOCS (buf);
if (GET_RELOC (buf) == NULL)
/* This should not happen. */
goto free_no_table;
if ((*reloc_symbol_deleted_p) (buf - ehbuf, cookie))
{
/* This is a FDE against a discarded section. It should
be deleted. */
new_size -= hdr.length + 4;
sec_info->entry[sec_info->count].removed = 1;
}
else
{
if (info->shared
&& (((cie.fde_encoding & 0xf0) == DW_EH_PE_absptr
&& cie.make_relative == 0)
|| (cie.fde_encoding & 0xf0) == DW_EH_PE_aligned))
{
/* If a shared library uses absolute pointers
which we cannot turn into PC relative,
don't create the binary search table,
since it is affected by runtime relocations. */
hdr_info->table = FALSE;
}
cie_usage_count++;
hdr_info->fde_count++;
}
if (cie.lsda_encoding != DW_EH_PE_omit)
{
unsigned int dummy;
aug = buf;
buf += 2 * get_DW_EH_PE_width (cie.fde_encoding, ptr_size);
if (cie.augmentation[0] == 'z')
read_uleb128 (dummy, buf);
/* If some new augmentation data is added before LSDA
in FDE augmentation area, this need to be adjusted. */
sec_info->entry[sec_info->count].lsda_offset = (buf - aug);
}
buf = last_fde + 4 + hdr.length;
SKIP_RELOCS (buf);
}
sec_info->entry[sec_info->count].fde_encoding = cie.fde_encoding;
sec_info->entry[sec_info->count].lsda_encoding = cie.lsda_encoding;
sec_info->count++;
}
elf_section_data (sec)->sec_info = sec_info;
sec->sec_info_type = ELF_INFO_TYPE_EH_FRAME;
/* Ok, now we can assign new offsets. */
offset = 0;
last_cie_ndx = 0;
for (i = 0; i < sec_info->count; i++)
{
if (! sec_info->entry[i].removed)
{
sec_info->entry[i].new_offset = offset;
offset += sec_info->entry[i].size;
if (sec_info->entry[i].cie)
{
last_cie_ndx = i;
make_relative = sec_info->entry[i].make_relative;
make_lsda_relative = sec_info->entry[i].make_lsda_relative;
}
else
{
sec_info->entry[i].make_relative = make_relative;
sec_info->entry[i].make_lsda_relative = make_lsda_relative;
sec_info->entry[i].per_encoding_relative = 0;
}
}
else if (sec_info->entry[i].cie && sec_info->entry[i].sec == sec)
{
/* Need to adjust new_offset too. */
BFD_ASSERT (sec_info->entry[last_cie_ndx].offset
== sec_info->entry[i].new_offset);
sec_info->entry[i].new_offset
= sec_info->entry[last_cie_ndx].new_offset;
}
}
if (hdr_info->last_cie_sec == sec)
{
BFD_ASSERT (sec_info->entry[last_cie_ndx].offset
== hdr_info->last_cie_offset);
hdr_info->last_cie_offset = sec_info->entry[last_cie_ndx].new_offset;
}
/* FIXME: Currently it is not possible to shrink sections to zero size at
this point, so build a fake minimal CIE. */
if (new_size == 0)
new_size = 16;
/* Shrink the sec as needed. */
sec->_cooked_size = new_size;
if (sec->_cooked_size == 0)
sec->flags |= SEC_EXCLUDE;
free (ehbuf);
return new_size != sec->_raw_size;
free_no_table:
if (ehbuf)
free (ehbuf);
if (sec_info)
free (sec_info);
hdr_info->table = FALSE;
hdr_info->last_cie.hdr.length = 0;
return FALSE;
}
int
_bfd_vms_write_gsd (bfd *abfd, int objtype ATTRIBUTE_UNUSED)
{
asection *section;
asymbol *symbol;
unsigned int symnum;
int last_index = -1;
char dummy_name[10];
char *sname;
flagword new_flags, old_flags;
#if defined(VMS_DEBUG) && VMS_DEBUG
vms_debug (2, "vms_write_gsd (%p, %d)\n", abfd, objtype);
#endif
/* Output sections. */
section = abfd->sections;
#if defined(VMS_DEBUG) && VMS_DEBUG
vms_debug (3, "%d sections found\n", abfd->section_count);
#endif
/* Egsd is quadword aligned. */
_bfd_vms_output_alignment (abfd, 8);
_bfd_vms_output_begin (abfd, EOBJ_S_C_EGSD, -1);
_bfd_vms_output_long (abfd, 0);
/* Prepare output for subrecords. */
_bfd_vms_output_push (abfd);
while (section != 0)
{
#if defined(VMS_DEBUG) && VMS_DEBUG
vms_debug (3, "Section #%d %s, %d bytes\n", section->index, section->name, (int)section->size);
#endif
/* 13 bytes egsd, max 31 chars name -> should be 44 bytes. */
if (_bfd_vms_output_check (abfd, 64) < 0)
{
_bfd_vms_output_pop (abfd);
_bfd_vms_output_end (abfd);
_bfd_vms_output_begin (abfd, EOBJ_S_C_EGSD, -1);
_bfd_vms_output_long (abfd, 0);
/* Prepare output for subrecords. */
_bfd_vms_output_push (abfd);
}
/* Create dummy sections to keep consecutive indices. */
while (section->index - last_index > 1)
{
#if defined(VMS_DEBUG) && VMS_DEBUG
vms_debug (3, "index %d, last %d\n", section->index, last_index);
#endif
_bfd_vms_output_begin (abfd, EGSD_S_C_PSC, -1);
_bfd_vms_output_short (abfd, 0);
_bfd_vms_output_short (abfd, 0);
_bfd_vms_output_long (abfd, 0);
sprintf (dummy_name, ".DUMMY%02d", last_index);
_bfd_vms_output_counted (abfd, dummy_name);
_bfd_vms_output_flush (abfd);
last_index++;
}
/* Don't know if this is necessary for the linker but for now it keeps
vms_slurp_gsd happy */
sname = (char *)section->name;
if (*sname == '.')
{
sname++;
if ((*sname == 't') && (strcmp (sname, "text") == 0))
sname = PRIV (is_vax)?VAX_CODE_NAME:EVAX_CODE_NAME;
else if ((*sname == 'd') && (strcmp (sname, "data") == 0))
sname = PRIV (is_vax)?VAX_DATA_NAME:EVAX_DATA_NAME;
else if ((*sname == 'b') && (strcmp (sname, "bss") == 0))
sname = EVAX_BSS_NAME;
else if ((*sname == 'l') && (strcmp (sname, "link") == 0))
sname = EVAX_LINK_NAME;
else if ((*sname == 'r') && (strcmp (sname, "rdata") == 0))
sname = EVAX_READONLY_NAME;
else if ((*sname == 'l') && (strcmp (sname, "literal") == 0))
sname = EVAX_LITERAL_NAME;
else if ((*sname == 'c') && (strcmp (sname, "comm") == 0))
sname = EVAX_COMMON_NAME;
else if ((*sname == 'l') && (strcmp (sname, "lcomm") == 0))
sname = EVAX_LOCAL_NAME;
}
else
sname = _bfd_vms_length_hash_symbol (abfd, sname, EOBJ_S_C_SECSIZ);
_bfd_vms_output_begin (abfd, EGSD_S_C_PSC, -1);
_bfd_vms_output_short (abfd, section->alignment_power & 0xff);
if (bfd_is_com_section (section))
new_flags = (EGPS_S_V_OVR | EGPS_S_V_REL | EGPS_S_V_GBL | EGPS_S_V_RD | EGPS_S_V_WRT | EGPS_S_V_NOMOD | EGPS_S_V_COM);
else
new_flags = vms_esecflag_by_name (evax_section_flags, sname,
section->size > 0);
_bfd_vms_output_short (abfd, new_flags);
_bfd_vms_output_long (abfd, (unsigned long) section->size);
_bfd_vms_output_counted (abfd, sname);
_bfd_vms_output_flush (abfd);
last_index = section->index;
section = section->next;
}
/* Output symbols. */
#if defined(VMS_DEBUG) && VMS_DEBUG
vms_debug (3, "%d symbols found\n", abfd->symcount);
#endif
bfd_set_start_address (abfd, (bfd_vma) -1);
for (symnum = 0; symnum < abfd->symcount; symnum++)
{
char *hash;
symbol = abfd->outsymbols[symnum];
if (*(symbol->name) == '_')
{
if (strcmp (symbol->name, "__main") == 0)
bfd_set_start_address (abfd, (bfd_vma)symbol->value);
}
old_flags = symbol->flags;
if (old_flags & BSF_FILE)
continue;
if (((old_flags & (BSF_GLOBAL | BSF_WEAK)) == 0) /* Not xdef... */
&& (!bfd_is_und_section (symbol->section))) /* ...and not xref. */
continue; /* Dont output. */
/* 13 bytes egsd, max 64 chars name -> should be 77 bytes. */
if (_bfd_vms_output_check (abfd, 80) < 0)
{
_bfd_vms_output_pop (abfd);
_bfd_vms_output_end (abfd);
_bfd_vms_output_begin (abfd, EOBJ_S_C_EGSD, -1);
_bfd_vms_output_long (abfd, 0);
/* Prepare output for subrecords. */
_bfd_vms_output_push (abfd);
}
_bfd_vms_output_begin (abfd, EGSD_S_C_SYM, -1);
/* Data type, alignment. */
_bfd_vms_output_short (abfd, 0);
new_flags = 0;
if (old_flags & BSF_WEAK)
new_flags |= EGSY_S_V_WEAK;
if (bfd_is_com_section (symbol->section))
new_flags |= (EGSY_S_V_WEAK | EGSY_S_V_COMM);
if (old_flags & BSF_FUNCTION)
{
new_flags |= EGSY_S_V_NORM;
new_flags |= EGSY_S_V_REL;
}
if (old_flags & (BSF_GLOBAL | BSF_WEAK))
{
new_flags |= EGSY_S_V_DEF;
if (!bfd_is_abs_section (symbol->section))
new_flags |= EGSY_S_V_REL;
}
_bfd_vms_output_short (abfd, new_flags);
if (old_flags & (BSF_GLOBAL | BSF_WEAK))
{
/* Symbol definition. */
uquad code_address = 0;
unsigned long ca_psindx = 0;
unsigned long psindx;
if ((old_flags & BSF_FUNCTION) && symbol->udata.p != NULL)
{
code_address = ((asymbol *) (symbol->udata.p))->value;
ca_psindx = ((asymbol *) (symbol->udata.p))->section->index;
}
psindx = symbol->section->index;
_bfd_vms_output_quad (abfd, symbol->value);
_bfd_vms_output_quad (abfd, code_address);
_bfd_vms_output_long (abfd, ca_psindx);
_bfd_vms_output_long (abfd, psindx);
}
hash = _bfd_vms_length_hash_symbol (abfd, symbol->name, EOBJ_S_C_SYMSIZ);
_bfd_vms_output_counted (abfd, hash);
_bfd_vms_output_flush (abfd);
}
_bfd_vms_output_alignment (abfd, 8);
_bfd_vms_output_pop (abfd);
_bfd_vms_output_end (abfd);
return 0;
}
