/* Support for the generic parts of COFF, for BFD.
- Copyright (C) 1990-2015 Free Software Foundation, Inc.
+ Copyright (C) 1990-2020 Free Software Foundation, Inc.
Written by Cygnus Support.
This file is part of BFD, the Binary File Descriptor library.
coff_data (abfd). */
#include "sysdep.h"
+#include <limits.h>
#include "bfd.h"
#include "libbfd.h"
#include "coff/internal.h"
const char *strings;
/* Flag that this BFD uses long names, even though the format might
- expect them to be off by default. This won't directly affect the
- format of any output BFD created from this one, but the information
- can be used to decide what to do. */
+ expect them to be off by default. This won't directly affect the
+ format of any output BFD created from this one, but the information
+ can be used to decide what to do. */
bfd_coff_set_long_section_names (abfd, TRUE);
memcpy (buf, hdr->s_name + 1, SCNNMLEN - 1);
buf[SCNNMLEN - 1] = '\0';
return FALSE;
strings += strindex;
name = (char *) bfd_alloc (abfd,
- (bfd_size_type) strlen (strings) + 1 + 1);
+ (bfd_size_type) strlen (strings) + 1 + 1);
if (name == NULL)
return FALSE;
strcpy (name, strings);
{
/* Assorted wastage to null-terminate the name, thanks AT&T! */
name = (char *) bfd_alloc (abfd,
- (bfd_size_type) sizeof (hdr->s_name) + 1 + 1);
+ (bfd_size_type) sizeof (hdr->s_name) + 1 + 1);
if (name == NULL)
return FALSE;
strncpy (name, (char *) &hdr->s_name[0], sizeof (hdr->s_name));
case compress:
if (!bfd_init_section_compress_status (abfd, return_section))
{
- (*_bfd_error_handler)
- (_("%B: unable to initialize compress status for section %s"),
+ _bfd_error_handler
+ /* xgettext: c-format */
+ (_("%pB: unable to initialize compress status for section %s"),
abfd, name);
return FALSE;
}
- if (name[1] != 'z')
+ if (return_section->compress_status == COMPRESS_SECTION_DONE)
{
- unsigned int len = strlen (name);
+ if (name[1] != 'z')
+ {
+ unsigned int len = strlen (name);
- new_name = bfd_alloc (abfd, len + 2);
- if (new_name == NULL)
- return FALSE;
- new_name[0] = '.';
- new_name[1] = 'z';
- memcpy (new_name + 2, name + 1, len);
+ new_name = bfd_alloc (abfd, len + 2);
+ if (new_name == NULL)
+ return FALSE;
+ new_name[0] = '.';
+ new_name[1] = 'z';
+ memcpy (new_name + 2, name + 1, len);
+ }
}
- break;
+ break;
case decompress:
if (!bfd_init_section_decompress_status (abfd, return_section))
{
- (*_bfd_error_handler)
- (_("%B: unable to initialize decompress status for section %s"),
+ _bfd_error_handler
+ /* xgettext: c-format */
+ (_("%pB: unable to initialize decompress status for section %s"),
abfd, name);
return FALSE;
}
break;
}
if (new_name != NULL)
- bfd_rename_section (abfd, return_section, new_name);
+ bfd_rename_section (return_section, new_name);
}
return result;
ECOFF as well. */
const bfd_target *
coff_real_object_p (bfd *,
- unsigned,
- struct internal_filehdr *,
- struct internal_aouthdr *);
+ unsigned,
+ struct internal_filehdr *,
+ struct internal_aouthdr *);
const bfd_target *
coff_real_object_p (bfd *abfd,
unsigned nscns,
if ((internal_f->f_flags & F_EXEC) != 0)
abfd->flags |= D_PAGED;
- bfd_get_symcount (abfd) = internal_f->f_nsyms;
+ abfd->symcount = internal_f->f_nsyms;
if (internal_f->f_nsyms)
abfd->flags |= HAS_SYMS;
if (internal_a != (struct internal_aouthdr *) NULL)
- bfd_get_start_address (abfd) = internal_a->entry;
+ abfd->start_address = internal_a->entry;
else
- bfd_get_start_address (abfd) = 0;
+ abfd->start_address = 0;
/* Set up the tdata area. ECOFF uses its own routine, and overrides
abfd->flags. */
}
}
+ obj_coff_keep_syms (abfd) = FALSE;
+ obj_coff_keep_strings (abfd) = FALSE;
+ _bfd_coff_free_symbols (abfd);
return abfd->xvec;
fail:
+ obj_coff_keep_syms (abfd) = FALSE;
+ obj_coff_keep_strings (abfd) = FALSE;
+ _bfd_coff_free_symbols (abfd);
bfd_release (abfd, tdata);
fail2:
abfd->tdata.any = tdata_save;
abfd->flags = oflags;
- bfd_get_start_address (abfd) = ostart;
+ abfd->start_address = ostart;
return (const bfd_target *) NULL;
}
if (limit == 0)
{
/* This may be from the backend linker, in which case the
- lineno_count in the sections is correct. */
+ lineno_count in the sections is correct. */
for (s = abfd->sections; s != NULL; s = s->next)
total += s->lineno_count;
return total;
coff_symbol_type *q = coffsymbol (q_maybe);
/* The AIX 4.1 compiler can sometimes generate line numbers
- attached to debugging symbols. We try to simply ignore
- those here. */
+ attached to debugging symbols. We try to simply ignore
+ those here. */
if (q->lineno != NULL
&& q->symbol.section->owner != NULL)
{
/* This symbol has line numbers. Increment the owning
- section's linenumber count. */
+ section's linenumber count. */
alent *l = q->lineno;
do
syment->n_value = (coff_symbol_ptr->symbol.value
+ coff_symbol_ptr->symbol.section->output_offset);
if (! obj_pe (abfd))
- {
- syment->n_value += (syment->n_sclass == C_STATLAB)
- ? coff_symbol_ptr->symbol.section->output_section->lma
- : coff_symbol_ptr->symbol.section->output_section->vma;
- }
+ {
+ syment->n_value += (syment->n_sclass == C_STATLAB)
+ ? coff_symbol_ptr->symbol.section->output_section->lma
+ : coff_symbol_ptr->symbol.section->output_section->vma;
+ }
}
else
{
if (s->fix_line)
{
/* The value is the offset into the line number entries
- for the symbol's section. On output, the symbol's
- section should be N_DEBUG. */
+ for the symbol's section. On output, the symbol's
+ section should be N_DEBUG. */
s->u.syment.n_value =
(coff_symbol_ptr->symbol.section->output_section->line_filepos
+ s->u.syment.n_value * bfd_coff_linesz (bfd_ptr));
if (bfd_coff_force_symnames_in_strings (abfd))
{
- native->u.syment._n._n_n._n_offset =
+ native->u.syment._n._n_n._n_offset =
(*string_size_p + STRING_SIZE_SIZE);
native->u.syment._n._n_n._n_zeroes = 0;
*string_size_p += 6; /* strlen(".file") + 1 */
}
else
- strncpy (native->u.syment._n._n_name, ".file", SYMNMLEN);
+ strncpy (native->u.syment._n._n_name, ".file", SYMNMLEN);
BFD_ASSERT (! (native + 1)->is_sym);
auxent = &(native + 1)->u.auxent;
coff_write_alien_symbol (bfd *abfd,
asymbol *symbol,
struct internal_syment *isym,
+ union internal_auxent *iaux,
bfd_vma *written,
bfd_size_type *string_size_p,
asection **debug_string_section_p,
{
symbol->name = "";
if (isym != NULL)
- memset (isym, 0, sizeof (*isym));
+ memset (isym, 0, sizeof (*isym));
return TRUE;
}
native = dummy;
else if (symbol->flags & BSF_DEBUGGING)
{
/* There isn't much point to writing out a debugging symbol
- unless we are prepared to convert it into COFF debugging
- format. So, we just ignore them. We must clobber the symbol
- name to keep it from being put in the string table. */
+ unless we are prepared to convert it into COFF debugging
+ format. So, we just ignore them. We must clobber the symbol
+ name to keep it from being put in the string table. */
symbol->name = "";
if (isym != NULL)
- memset (isym, 0, sizeof (*isym));
+ memset (isym, 0, sizeof (*isym));
return TRUE;
}
else
native->u.syment.n_value += output_section->vma;
/* Copy the any flags from the file header into the symbol.
- FIXME: Why? */
+ FIXME: Why? */
{
coff_symbol_type *c = coff_symbol_from (symbol);
if (c != (coff_symbol_type *) NULL)
debug_string_section_p, debug_string_size_p);
if (isym != NULL)
*isym = native->u.syment;
+ if (iaux != NULL && native->u.syment.n_numaux)
+ *iaux = native[1].u.auxent;
return ret;
}
}
static void
-null_error_handler (const char * fmt ATTRIBUTE_UNUSED, ...)
+null_error_handler (const char *fmt ATTRIBUTE_UNUSED,
+ va_list ap ATTRIBUTE_UNUSED)
{
}
if (c_symbol == (coff_symbol_type *) NULL
|| c_symbol->native == (combined_entry_type *) NULL)
{
- if (!coff_write_alien_symbol (abfd, symbol, NULL, &written,
+ if (!coff_write_alien_symbol (abfd, symbol, NULL, NULL, &written,
&string_size, &debug_string_section,
&debug_string_size))
return FALSE;
else if (! c_symbol->native->is_sym)
maxlen = bfd_coff_force_symnames_in_strings (abfd) ? 0 : SYMNMLEN;
-
+
else if (bfd_coff_symname_in_debug (abfd,
&c_symbol->native->u.syment))
/* This symbol name is in the XCOFF .debug section.
else
{
/* We would normally not write anything here, but we'll write
- out 4 so that any stupid coff reader which tries to read the
- string table even when there isn't one won't croak. */
+ out 4 so that any stupid coff reader which tries to read the
+ string table even when there isn't one won't croak. */
unsigned int size = STRING_SIZE_SIZE;
bfd_byte buffer[STRING_SIZE_SIZE];
combined_entry_type *table_base,
combined_entry_type *symbol,
unsigned int indaux,
- combined_entry_type *auxent)
+ combined_entry_type *auxent,
+ combined_entry_type *table_end)
{
unsigned int type = symbol->u.syment.n_type;
unsigned int n_sclass = symbol->u.syment.n_sclass;
if ((ISFCN (type) || ISTAG (n_sclass) || n_sclass == C_BLOCK
|| n_sclass == C_FCN)
- && auxent->u.auxent.x_sym.x_fcnary.x_fcn.x_endndx.l > 0)
+ && auxent->u.auxent.x_sym.x_fcnary.x_fcn.x_endndx.l > 0
+ && auxent->u.auxent.x_sym.x_fcnary.x_fcn.x_endndx.l
+ < (long) obj_raw_syment_count (abfd)
+ && table_base + auxent->u.auxent.x_sym.x_fcnary.x_fcn.x_endndx.l
+ < table_end)
{
auxent->u.auxent.x_sym.x_fcnary.x_fcn.x_endndx.p =
table_base + auxent->u.auxent.x_sym.x_fcnary.x_fcn.x_endndx.l;
auxent->fix_end = 1;
}
+
/* A negative tagndx is meaningless, but the SCO 3.2v4 cc can
generate one, so we must be careful to ignore it. */
- if (auxent->u.auxent.x_sym.x_tagndx.l > 0)
+ if ((unsigned long) auxent->u.auxent.x_sym.x_tagndx.l
+ < obj_raw_syment_count (abfd)
+ && table_base + auxent->u.auxent.x_sym.x_tagndx.l < table_end)
{
auxent->u.auxent.x_sym.x_tagndx.p =
table_base + auxent->u.auxent.x_sym.x_tagndx.l;
size = obj_raw_syment_count (abfd) * symesz;
if (size == 0)
return TRUE;
+ /* Check for integer overflow and for unreasonable symbol counts. */
+ if (size < obj_raw_syment_count (abfd)
+ || (bfd_get_file_size (abfd) > 0
+ && size > bfd_get_file_size (abfd)))
+
+ {
+ _bfd_error_handler (_("%pB: corrupt symbol count: %#" PRIx64 ""),
+ abfd, (uint64_t) obj_raw_syment_count (abfd));
+ return FALSE;
+ }
syms = bfd_malloc (size);
if (syms == NULL)
- return FALSE;
+ {
+ /* PR 21013: Provide an error message when the alloc fails. */
+ _bfd_error_handler (_("%pB: not enough memory to allocate space "
+ "for %#" PRIx64 " symbols of size %#" PRIx64),
+ abfd, (uint64_t) obj_raw_syment_count (abfd),
+ (uint64_t) symesz);
+ return FALSE;
+ }
if (bfd_seek (abfd, obj_sym_filepos (abfd), SEEK_SET) != 0
|| bfd_bread (syms, size, abfd) != size)
}
obj_coff_external_syms (abfd) = syms;
-
return TRUE;
}
#endif
}
- if (strsize < STRING_SIZE_SIZE)
+ if (strsize < STRING_SIZE_SIZE || strsize > bfd_get_file_size (abfd))
{
- (*_bfd_error_handler)
- (_("%B: bad string table size %lu"), abfd, (unsigned long) strsize);
+ _bfd_error_handler
+ /* xgettext: c-format */
+ (_("%pB: bad string table size %" PRIu64), abfd, (uint64_t) strsize);
bfd_set_error (bfd_error_bad_value);
return NULL;
}
bfd_boolean
_bfd_coff_free_symbols (bfd *abfd)
{
+ if (! bfd_family_coff (abfd))
+ return FALSE;
+
if (obj_coff_external_syms (abfd) != NULL
&& ! obj_coff_keep_syms (abfd))
{
free (obj_coff_external_syms (abfd));
obj_coff_external_syms (abfd) = NULL;
}
+
if (obj_coff_strings (abfd) != NULL
&& ! obj_coff_keep_strings (abfd))
{
obj_coff_strings (abfd) = NULL;
obj_coff_strings_len (abfd) = 0;
}
+
return TRUE;
}
if (! _bfd_coff_get_external_symbols (abfd))
return NULL;
- size = obj_raw_syment_count (abfd) * sizeof (combined_entry_type);
+ size = obj_raw_syment_count (abfd);
+ /* Check for integer overflow. */
+ if (size > (bfd_size_type) -1 / sizeof (combined_entry_type))
+ return NULL;
+ size *= sizeof (combined_entry_type);
internal = (combined_entry_type *) bfd_zalloc (abfd, size);
if (internal == NULL && size != 0)
return NULL;
internal_end = internal + obj_raw_syment_count (abfd);
-
+
raw_src = (char *) obj_coff_external_syms (abfd);
/* Mark the end of the symbols. */
symbol_ptr = internal_ptr;
internal_ptr->is_sym = TRUE;
- /* PR 17512: file: 1353-1166-0.004. */
- if (symbol_ptr->u.syment.n_sclass == C_FILE
- && symbol_ptr->u.syment.n_numaux > 0
- && raw_src + symesz + symbol_ptr->u.syment.n_numaux
- * sizeof (union internal_auxent) >= raw_end)
- {
- bfd_release (abfd, internal);
- return NULL;
- }
-
for (i = 0;
i < symbol_ptr->u.syment.n_numaux;
i++)
{
internal_ptr++;
+ raw_src += symesz;
+
/* PR 17512: Prevent buffer overrun. */
- if (internal_ptr >= internal_end)
+ if (raw_src >= raw_end || internal_ptr >= internal_end)
{
bfd_release (abfd, internal);
return NULL;
}
- raw_src += symesz;
-
bfd_coff_swap_aux_in (abfd, (void *) raw_src,
symbol_ptr->u.syment.n_type,
symbol_ptr->u.syment.n_sclass,
internal_ptr->is_sym = FALSE;
coff_pointerize_aux (abfd, internal, symbol_ptr, i,
- internal_ptr);
+ internal_ptr, internal_end);
}
}
else
{
/* Ordinary short filename, put into memory anyway. The
- Microsoft PE tools sometimes store a filename in
- multiple AUX entries. */
+ Microsoft PE tools sometimes store a filename in
+ multiple AUX entries. */
if (internal_ptr->u.syment.n_numaux > 1
&& coff_data (abfd)->pe)
internal_ptr->u.syment._n._n_n._n_offset =
char *newstring;
/* Find the length of this string without walking into memory
- that isn't ours. */
+ that isn't ours. */
for (i = 0; i < 8; ++i)
if (internal_ptr->u.syment._n._n_name[i] == '\0')
break;
else if (!bfd_coff_symname_in_debug (abfd, &internal_ptr->u.syment))
{
/* Long name already. Point symbol at the string in the
- table. */
+ table. */
if (string_table == NULL)
{
string_table = _bfd_coff_read_string_table (abfd);
bfd_set_error (bfd_error_invalid_operation);
return -1;
}
+#if SIZEOF_LONG == SIZEOF_INT
+ if (asect->reloc_count >= LONG_MAX / sizeof (arelent *))
+ {
+ bfd_set_error (bfd_error_file_too_big);
+ return -1;
+ }
+#endif
return (asect->reloc_count + 1) * sizeof (arelent *);
}
auxp->u.auxent.x_scn.x_comdat);
break;
}
- /* Otherwise fall through. */
+ /* Fall through. */
case C_EXT:
case C_AIX_WEAKEXT:
if (ISFCN (combined->u.syment.n_type))
llnos, next);
break;
}
- /* Otherwise fall through. */
+ /* Fall through. */
default:
fprintf (file, "AUX lnno %d size 0x%x tagndx %ld",
auxp->u.auxent.x_sym.x_misc.x_lnsz.x_lnno,
bfd_boolean
coff_find_nearest_line_with_names (bfd *abfd,
- asymbol **symbols,
- asection *section,
- bfd_vma offset,
- const char **filename_ptr,
- const char **functionname_ptr,
- unsigned int *line_ptr,
- const struct dwarf_debug_section *debug_sections)
+ asymbol **symbols,
+ asection *section,
+ bfd_vma offset,
+ const char **filename_ptr,
+ const char **functionname_ptr,
+ unsigned int *line_ptr,
+ const struct dwarf_debug_section *debug_sections)
{
bfd_boolean found;
unsigned int i;
/* Also try examining DWARF2 debugging information. */
if (_bfd_dwarf2_find_nearest_line (abfd, symbols, NULL, section, offset,
filename_ptr, functionname_ptr,
- line_ptr, NULL, debug_sections, 0,
+ line_ptr, NULL, debug_sections,
&coff_data(abfd)->dwarf2_find_line_info))
return TRUE;
+ sec_data = coff_section_data (abfd, section);
+
/* If the DWARF lookup failed, but there is DWARF information available
then the problem might be that the file has been rebased. This tool
changes the VMAs of all the sections, but it does not update the DWARF
information. So try again, using a bias against the address sought. */
if (coff_data (abfd)->dwarf2_find_line_info != NULL)
{
- bfd_signed_vma bias;
+ bfd_signed_vma bias = 0;
+
+ /* Create a cache of the result for the next call. */
+ if (sec_data == NULL && section->owner == abfd)
+ {
+ amt = sizeof (struct coff_section_tdata);
+ section->used_by_bfd = bfd_zalloc (abfd, amt);
+ sec_data = (struct coff_section_tdata *) section->used_by_bfd;
+ }
+
+ if (sec_data != NULL && sec_data->saved_bias)
+ bias = sec_data->saved_bias;
+ else if (symbols)
+ {
+ bias = _bfd_dwarf2_find_symbol_bias (symbols,
+ & coff_data (abfd)->dwarf2_find_line_info);
+
+ if (sec_data)
+ {
+ sec_data->saved_bias = TRUE;
+ sec_data->bias = bias;
+ }
+ }
- bias = _bfd_dwarf2_find_symbol_bias (symbols,
- & coff_data (abfd)->dwarf2_find_line_info);
-
if (bias
&& _bfd_dwarf2_find_nearest_line (abfd, symbols, NULL, section,
offset + bias,
filename_ptr, functionname_ptr,
- line_ptr, NULL, debug_sections, 0,
+ line_ptr, NULL, debug_sections,
&coff_data(abfd)->dwarf2_find_line_info))
return TRUE;
}
bfd_vma maxdiff;
/* Look through the C_FILE symbols to find the best one. */
- sec_vma = bfd_get_section_vma (abfd, section);
+ sec_vma = bfd_section_vma (section);
*filename_ptr = (char *) p->u.syment._n._n_n._n_offset;
maxdiff = (bfd_vma) 0 - (bfd_vma) 1;
while (1)
file_addr += coff_section_from_bfd_index (abfd,
p2->u.syment.n_scnum)->vma;
/* We use <= MAXDIFF here so that if we get a zero length
- file, we actually use the next file entry. */
+ file, we actually use the next file entry. */
if (p2 < pend
&& offset + sec_vma >= file_addr
&& offset + sec_vma - file_addr <= maxdiff)
maxdiff = offset + sec_vma - p2->u.syment.n_value;
}
+ if (p->u.syment.n_value >= cof->raw_syment_count)
+ break;
+
/* Avoid endless loops on erroneous files by ensuring that
we always move forward in the file. */
if (p >= cof->raw_syments + p->u.syment.n_value)
break;
p = cof->raw_syments + p->u.syment.n_value;
- if (p > pend || p->u.syment.n_sclass != C_FILE)
+ if (!p->is_sym || p->u.syment.n_sclass != C_FILE)
break;
}
}
- /* Now wander though the raw linenumbers of the section. */
- /* If we have been called on this section before, and the offset we
- want is further down then we can prime the lookup loop. */
- sec_data = coff_section_data (abfd, section);
+ if (section->lineno_count == 0)
+ {
+ *functionname_ptr = NULL;
+ *line_ptr = 0;
+ return TRUE;
+ }
+
+ /* Now wander though the raw linenumbers of the section.
+ If we have been called on this section before, and the offset
+ we want is further down then we can prime the lookup loop. */
if (sec_data != NULL
&& sec_data->i > 0
&& offset >= sec_data->offset)
coff_symbol_type *coff = (coff_symbol_type *) (l->u.sym);
if (coff->symbol.value > offset)
break;
+
*functionname_ptr = coff->symbol.name;
last_value = coff->symbol.value;
if (coff->native)
section->used_by_bfd = bfd_zalloc (abfd, amt);
sec_data = (struct coff_section_tdata *) section->used_by_bfd;
}
+
if (sec_data != NULL)
{
sec_data->offset = offset;
if (discriminator_ptr)
*discriminator_ptr = 0;
return coff_find_nearest_line_with_names (abfd, symbols, section, offset,
- filename_ptr, functionname_ptr,
- line_ptr, dwarf_debug_sections);
+ filename_ptr, functionname_ptr,
+ line_ptr, dwarf_debug_sections);
}
bfd_boolean
{
size_t size;
- if (!info->relocatable)
+ if (!bfd_link_relocatable (info))
size = bfd_coff_filhsz (abfd) + bfd_coff_aoutsz (abfd);
else
size = bfd_coff_filhsz (abfd);
/* Change the class of a coff symbol held by BFD. */
bfd_boolean
-bfd_coff_set_symbol_class (bfd * abfd,
- asymbol * symbol,
- unsigned int symbol_class)
+bfd_coff_set_symbol_class (bfd * abfd,
+ asymbol * symbol,
+ unsigned int symbol_class)
{
coff_symbol_type * csym;
struct bfd_section_already_linked_hash_entry *already_linked_list;
struct coff_comdat_info *s_comdat;
+ if (sec->output_section == bfd_abs_section_ptr)
+ return FALSE;
+
flags = sec->flags;
if ((flags & SEC_LINK_ONCE) == 0)
return FALSE;
if ((flags & SEC_GROUP) != 0)
return FALSE;
- name = bfd_get_section_name (abfd, sec);
+ name = bfd_section_name (sec);
s_comdat = bfd_coff_get_comdat_section (abfd, sec);
if (s_comdat != NULL)
info->callbacks->einfo (_("%F%P: already_linked_table: %E\n"));
return FALSE;
}
+
+/* Initialize COOKIE for input bfd ABFD. */
+
+static bfd_boolean
+init_reloc_cookie (struct coff_reloc_cookie *cookie,
+ struct bfd_link_info *info ATTRIBUTE_UNUSED,
+ bfd *abfd)
+{
+ /* Sometimes the symbol table does not yet have been loaded here. */
+ bfd_coff_slurp_symbol_table (abfd);
+
+ cookie->abfd = abfd;
+ cookie->sym_hashes = obj_coff_sym_hashes (abfd);
+
+ cookie->symbols = obj_symbols (abfd);
+
+ return TRUE;
+}
+
+/* Free the memory allocated by init_reloc_cookie, if appropriate. */
+
+static void
+fini_reloc_cookie (struct coff_reloc_cookie *cookie ATTRIBUTE_UNUSED,
+ bfd *abfd ATTRIBUTE_UNUSED)
+{
+ /* Nothing to do. */
+}
+
+/* Initialize the relocation information in COOKIE for input section SEC
+ of input bfd ABFD. */
+
+static bfd_boolean
+init_reloc_cookie_rels (struct coff_reloc_cookie *cookie,
+ struct bfd_link_info *info ATTRIBUTE_UNUSED,
+ bfd *abfd,
+ asection *sec)
+{
+ if (sec->reloc_count == 0)
+ {
+ cookie->rels = NULL;
+ cookie->relend = NULL;
+ cookie->rel = NULL;
+ return TRUE;
+ }
+
+ cookie->rels = _bfd_coff_read_internal_relocs (abfd, sec, FALSE, NULL, 0, NULL);
+
+ if (cookie->rels == NULL)
+ return FALSE;
+
+ cookie->rel = cookie->rels;
+ cookie->relend = (cookie->rels + sec->reloc_count);
+ return TRUE;
+}
+
+/* Free the memory allocated by init_reloc_cookie_rels,
+ if appropriate. */
+
+static void
+fini_reloc_cookie_rels (struct coff_reloc_cookie *cookie,
+ asection *sec)
+{
+ if (cookie->rels
+ /* PR 20401. The relocs may not have been cached, so check first.
+ If the relocs were loaded by init_reloc_cookie_rels() then this
+ will be the case. FIXME: Would performance be improved if the
+ relocs *were* cached ? */
+ && coff_section_data (NULL, sec)
+ && coff_section_data (NULL, sec)->relocs != cookie->rels)
+ free (cookie->rels);
+}
+
+/* Initialize the whole of COOKIE for input section SEC. */
+
+static bfd_boolean
+init_reloc_cookie_for_section (struct coff_reloc_cookie *cookie,
+ struct bfd_link_info *info,
+ asection *sec)
+{
+ if (!init_reloc_cookie (cookie, info, sec->owner))
+ return FALSE;
+
+ if (!init_reloc_cookie_rels (cookie, info, sec->owner, sec))
+ {
+ fini_reloc_cookie (cookie, sec->owner);
+ return FALSE;
+ }
+ return TRUE;
+}
+
+/* Free the memory allocated by init_reloc_cookie_for_section,
+ if appropriate. */
+
+static void
+fini_reloc_cookie_for_section (struct coff_reloc_cookie *cookie,
+ asection *sec)
+{
+ fini_reloc_cookie_rels (cookie, sec);
+ fini_reloc_cookie (cookie, sec->owner);
+}
+
+static asection *
+_bfd_coff_gc_mark_hook (asection *sec,
+ struct bfd_link_info *info ATTRIBUTE_UNUSED,
+ struct internal_reloc *rel ATTRIBUTE_UNUSED,
+ struct coff_link_hash_entry *h,
+ struct internal_syment *sym)
+{
+ if (h != NULL)
+ {
+ switch (h->root.type)
+ {
+ case bfd_link_hash_defined:
+ case bfd_link_hash_defweak:
+ return h->root.u.def.section;
+
+ case bfd_link_hash_common:
+ return h->root.u.c.p->section;
+
+ case bfd_link_hash_undefweak:
+ if (h->symbol_class == C_NT_WEAK && h->numaux == 1)
+ {
+ /* PE weak externals. A weak symbol may include an auxiliary
+ record indicating that if the weak symbol is not resolved,
+ another external symbol is used instead. */
+ struct coff_link_hash_entry *h2 =
+ h->auxbfd->tdata.coff_obj_data->sym_hashes[
+ h->aux->x_sym.x_tagndx.l];
+
+ if (h2 && h2->root.type != bfd_link_hash_undefined)
+ return h2->root.u.def.section;
+ }
+ break;
+
+ case bfd_link_hash_undefined:
+ default:
+ break;
+ }
+ return NULL;
+ }
+
+ return coff_section_from_bfd_index (sec->owner, sym->n_scnum);
+}
+
+/* COOKIE->rel describes a relocation against section SEC, which is
+ a section we've decided to keep. Return the section that contains
+ the relocation symbol, or NULL if no section contains it. */
+
+static asection *
+_bfd_coff_gc_mark_rsec (struct bfd_link_info *info, asection *sec,
+ coff_gc_mark_hook_fn gc_mark_hook,
+ struct coff_reloc_cookie *cookie)
+{
+ struct coff_link_hash_entry *h;
+
+ h = cookie->sym_hashes[cookie->rel->r_symndx];
+ if (h != NULL)
+ {
+ while (h->root.type == bfd_link_hash_indirect
+ || h->root.type == bfd_link_hash_warning)
+ h = (struct coff_link_hash_entry *) h->root.u.i.link;
+
+ return (*gc_mark_hook) (sec, info, cookie->rel, h, NULL);
+ }
+
+ return (*gc_mark_hook) (sec, info, cookie->rel, NULL,
+ &(cookie->symbols
+ + obj_convert (sec->owner)[cookie->rel->r_symndx])->native->u.syment);
+}
+
+static bfd_boolean _bfd_coff_gc_mark
+ (struct bfd_link_info *, asection *, coff_gc_mark_hook_fn);
+
+/* COOKIE->rel describes a relocation against section SEC, which is
+ a section we've decided to keep. Mark the section that contains
+ the relocation symbol. */
+
+static bfd_boolean
+_bfd_coff_gc_mark_reloc (struct bfd_link_info *info,
+ asection *sec,
+ coff_gc_mark_hook_fn gc_mark_hook,
+ struct coff_reloc_cookie *cookie)
+{
+ asection *rsec;
+
+ rsec = _bfd_coff_gc_mark_rsec (info, sec, gc_mark_hook, cookie);
+ if (rsec && !rsec->gc_mark)
+ {
+ if (bfd_get_flavour (rsec->owner) != bfd_target_coff_flavour)
+ rsec->gc_mark = 1;
+ else if (!_bfd_coff_gc_mark (info, rsec, gc_mark_hook))
+ return FALSE;
+ }
+ return TRUE;
+}
+
+/* The mark phase of garbage collection. For a given section, mark
+ it and any sections in this section's group, and all the sections
+ which define symbols to which it refers. */
+
+static bfd_boolean
+_bfd_coff_gc_mark (struct bfd_link_info *info,
+ asection *sec,
+ coff_gc_mark_hook_fn gc_mark_hook)
+{
+ bfd_boolean ret = TRUE;
+
+ sec->gc_mark = 1;
+
+ /* Look through the section relocs. */
+ if ((sec->flags & SEC_RELOC) != 0
+ && sec->reloc_count > 0)
+ {
+ struct coff_reloc_cookie cookie;
+
+ if (!init_reloc_cookie_for_section (&cookie, info, sec))
+ ret = FALSE;
+ else
+ {
+ for (; cookie.rel < cookie.relend; cookie.rel++)
+ {
+ if (!_bfd_coff_gc_mark_reloc (info, sec, gc_mark_hook, &cookie))
+ {
+ ret = FALSE;
+ break;
+ }
+ }
+ fini_reloc_cookie_for_section (&cookie, sec);
+ }
+ }
+
+ return ret;
+}
+
+static bfd_boolean
+_bfd_coff_gc_mark_extra_sections (struct bfd_link_info *info,
+ coff_gc_mark_hook_fn mark_hook ATTRIBUTE_UNUSED)
+{
+ bfd *ibfd;
+
+ for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
+ {
+ asection *isec;
+ bfd_boolean some_kept;
+
+ if (bfd_get_flavour (ibfd) != bfd_target_coff_flavour)
+ continue;
+
+ /* Ensure all linker created sections are kept, and see whether
+ any other section is already marked. */
+ some_kept = FALSE;
+ for (isec = ibfd->sections; isec != NULL; isec = isec->next)
+ {
+ if ((isec->flags & SEC_LINKER_CREATED) != 0)
+ isec->gc_mark = 1;
+ else if (isec->gc_mark)
+ some_kept = TRUE;
+ }
+
+ /* If no section in this file will be kept, then we can
+ toss out debug sections. */
+ if (!some_kept)
+ continue;
+
+ /* Keep debug and special sections like .comment when they are
+ not part of a group, or when we have single-member groups. */
+ for (isec = ibfd->sections; isec != NULL; isec = isec->next)
+ if ((isec->flags & SEC_DEBUGGING) != 0
+ || (isec->flags & (SEC_ALLOC | SEC_LOAD | SEC_RELOC)) == 0)
+ isec->gc_mark = 1;
+ }
+ return TRUE;
+}
+
+/* Sweep symbols in swept sections. Called via coff_link_hash_traverse. */
+
+static bfd_boolean
+coff_gc_sweep_symbol (struct coff_link_hash_entry *h,
+ void *data ATTRIBUTE_UNUSED)
+{
+ if (h->root.type == bfd_link_hash_warning)
+ h = (struct coff_link_hash_entry *) h->root.u.i.link;
+
+ if ((h->root.type == bfd_link_hash_defined
+ || h->root.type == bfd_link_hash_defweak)
+ && !h->root.u.def.section->gc_mark
+ && !(h->root.u.def.section->owner->flags & DYNAMIC))
+ {
+ /* Do our best to hide the symbol. */
+ h->root.u.def.section = bfd_und_section_ptr;
+ h->symbol_class = C_HIDDEN;
+ }
+
+ return TRUE;
+}
+
+/* The sweep phase of garbage collection. Remove all garbage sections. */
+
+typedef bfd_boolean (*gc_sweep_hook_fn)
+ (bfd *, struct bfd_link_info *, asection *, const struct internal_reloc *);
+
+static bfd_boolean
+coff_gc_sweep (bfd *abfd ATTRIBUTE_UNUSED, struct bfd_link_info *info)
+{
+ bfd *sub;
+
+ for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
+ {
+ asection *o;
+
+ if (bfd_get_flavour (sub) != bfd_target_coff_flavour)
+ continue;
+
+ for (o = sub->sections; o != NULL; o = o->next)
+ {
+ /* Keep debug and special sections. */
+ if ((o->flags & (SEC_DEBUGGING | SEC_LINKER_CREATED)) != 0
+ || (o->flags & (SEC_ALLOC | SEC_LOAD | SEC_RELOC)) == 0)
+ o->gc_mark = 1;
+ else if (CONST_STRNEQ (o->name, ".idata")
+ || CONST_STRNEQ (o->name, ".pdata")
+ || CONST_STRNEQ (o->name, ".xdata")
+ || CONST_STRNEQ (o->name, ".rsrc"))
+ o->gc_mark = 1;
+
+ if (o->gc_mark)
+ continue;
+
+ /* Skip sweeping sections already excluded. */
+ if (o->flags & SEC_EXCLUDE)
+ continue;
+
+ /* Since this is early in the link process, it is simple
+ to remove a section from the output. */
+ o->flags |= SEC_EXCLUDE;
+
+ if (info->print_gc_sections && o->size != 0)
+ /* xgettext: c-format */
+ _bfd_error_handler (_("removing unused section '%pA' in file '%pB'"),
+ o, sub);
+
+#if 0
+ /* But we also have to update some of the relocation
+ info we collected before. */
+ if (gc_sweep_hook
+ && (o->flags & SEC_RELOC) != 0
+ && o->reloc_count > 0
+ && !bfd_is_abs_section (o->output_section))
+ {
+ struct internal_reloc *internal_relocs;
+ bfd_boolean r;
+
+ internal_relocs
+ = _bfd_coff_link_read_relocs (o->owner, o, NULL, NULL,
+ info->keep_memory);
+ if (internal_relocs == NULL)
+ return FALSE;
+
+ r = (*gc_sweep_hook) (o->owner, info, o, internal_relocs);
+
+ if (coff_section_data (o)->relocs != internal_relocs)
+ free (internal_relocs);
+
+ if (!r)
+ return FALSE;
+ }
+#endif
+ }
+ }
+
+ /* Remove the symbols that were in the swept sections from the dynamic
+ symbol table. */
+ coff_link_hash_traverse (coff_hash_table (info), coff_gc_sweep_symbol,
+ NULL);
+
+ return TRUE;
+}
+
+/* Keep all sections containing symbols undefined on the command-line,
+ and the section containing the entry symbol. */
+
+static void
+_bfd_coff_gc_keep (struct bfd_link_info *info)
+{
+ struct bfd_sym_chain *sym;
+
+ for (sym = info->gc_sym_list; sym != NULL; sym = sym->next)
+ {
+ struct coff_link_hash_entry *h;
+
+ h = coff_link_hash_lookup (coff_hash_table (info), sym->name,
+ FALSE, FALSE, FALSE);
+
+ if (h != NULL
+ && (h->root.type == bfd_link_hash_defined
+ || h->root.type == bfd_link_hash_defweak)
+ && !bfd_is_abs_section (h->root.u.def.section))
+ h->root.u.def.section->flags |= SEC_KEEP;
+ }
+}
+
+/* Do mark and sweep of unused sections. */
+
+bfd_boolean
+bfd_coff_gc_sections (bfd *abfd ATTRIBUTE_UNUSED, struct bfd_link_info *info)
+{
+ bfd *sub;
+
+ /* FIXME: Should we implement this? */
+#if 0
+ const bfd_coff_backend_data *bed = coff_backend_info (abfd);
+
+ if (!bed->can_gc_sections
+ || !is_coff_hash_table (info->hash))
+ {
+ _bfd_error_handler(_("warning: gc-sections option ignored"));
+ return TRUE;
+ }
+#endif
+
+ _bfd_coff_gc_keep (info);
+
+ /* Grovel through relocs to find out who stays ... */
+ for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
+ {
+ asection *o;
+
+ if (bfd_get_flavour (sub) != bfd_target_coff_flavour)
+ continue;
+
+ for (o = sub->sections; o != NULL; o = o->next)
+ {
+ if (((o->flags & (SEC_EXCLUDE | SEC_KEEP)) == SEC_KEEP
+ || CONST_STRNEQ (o->name, ".vectors")
+ || CONST_STRNEQ (o->name, ".ctors")
+ || CONST_STRNEQ (o->name, ".dtors"))
+ && !o->gc_mark)
+ {
+ if (!_bfd_coff_gc_mark (info, o, _bfd_coff_gc_mark_hook))
+ return FALSE;
+ }
+ }
+ }
+
+ /* Allow the backend to mark additional target specific sections. */
+ _bfd_coff_gc_mark_extra_sections (info, _bfd_coff_gc_mark_hook);
+
+ /* ... and mark SEC_EXCLUDE for those that go. */
+ return coff_gc_sweep (abfd, info);
+}
+
+/* Return name used to identify a comdat group. */
+
+const char *
+bfd_coff_group_name (bfd *abfd, const asection *sec)
+{
+ struct coff_comdat_info *ci = bfd_coff_get_comdat_section (abfd, sec);
+ if (ci != NULL)
+ return ci->name;
+ return NULL;
+}
+
+bfd_boolean
+_bfd_coff_close_and_cleanup (bfd *abfd)
+{
+ if (abfd->format == bfd_object
+ && bfd_family_coff (abfd)
+ && coff_data (abfd) != NULL)
+ {
+ obj_coff_keep_syms (abfd) = FALSE;
+ obj_coff_keep_strings (abfd) = FALSE;
+ if (!_bfd_coff_free_symbols (abfd))
+ return FALSE;
+ }
+ return _bfd_generic_close_and_cleanup (abfd);
+}
projects / deliverable / binutils-gdb.git / blobdiff