/* ELF object file format
- Copyright 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
- 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
- Free Software Foundation, Inc.
+ Copyright (C) 1992-2016 Free Software Foundation, Inc.
This file is part of GAS, the GNU Assembler.
#include "elf/mep.h"
#endif
+#ifdef TC_NIOS2
+#include "elf/nios2.h"
+#endif
+
static void obj_elf_line (int);
static void obj_elf_size (int);
static void obj_elf_type (int);
static void obj_elf_symver (int);
static void obj_elf_subsection (int);
static void obj_elf_popsection (int);
+static void obj_elf_gnu_attribute (int);
static void obj_elf_tls_common (int);
static void obj_elf_lcomm (int);
static void obj_elf_struct (int);
{"vtable_inherit", (void (*) (int)) &obj_elf_vtable_inherit, 0},
{"vtable_entry", (void (*) (int)) &obj_elf_vtable_entry, 0},
+ /* A GNU extension for object attributes. */
+ {"gnu_attribute", obj_elf_gnu_attribute, 0},
+
/* These are used for dwarf. */
{"2byte", cons, 2},
{"4byte", cons, 4},
|| (symbol_rootP->bsym->flags & BSF_FILE) == 0)
{
symbolS *sym;
- unsigned int name_length;
+ size_t name_length;
sym = symbol_new (s, absolute_section, 0, NULL);
symbol_set_frag (sym, &zero_address_frag);
symbol_get_bfdsym (sym)->flags |= BSF_FILE;
- if (symbol_rootP != sym)
+ if (symbol_rootP != sym
+ && (symbol_rootP->bsym == NULL
+ || !(symbol_rootP->bsym->flags & BSF_FILE)))
{
symbol_remove (sym, &symbol_rootP, &symbol_lastP);
symbol_insert (sym, symbol_rootP, &symbol_rootP, &symbol_lastP);
+ }
+
#ifdef DEBUG
- verify_symbol_chain (symbol_rootP, symbol_lastP);
+ verify_symbol_chain (symbol_rootP, symbol_lastP);
#endif
- }
}
#ifdef NEED_ECOFF_DEBUG
char c;
symbolS *sym;
- name = input_line_pointer;
- c = get_symbol_end ();
+ c = get_symbol_name (& name);
sym = symbol_find_or_make (name);
*input_line_pointer = c;
- SKIP_WHITESPACE ();
+ SKIP_WHITESPACE_AFTER_NAME ();
/* There is no symbol name if input_line_pointer has not moved. */
if (name == input_line_pointer)
symbolP = get_sym_from_input_line_and_check ();
c = *input_line_pointer;
S_SET_WEAK (symbolP);
- symbol_get_obj (symbolP)->local = 1;
if (c == ',')
{
input_line_pointer++;
void
obj_elf_change_section (const char *name,
- int type,
+ unsigned int type,
bfd_vma attr,
int entsize,
const char *group_name,
if (push)
{
struct section_stack *elt;
- elt = (struct section_stack *) xmalloc (sizeof (struct section_stack));
+ elt = XNEW (struct section_stack);
elt->next = section_stack;
elt->seg = now_seg;
elt->prev_seg = previous_section;
&& ssect->type != SHT_PREINIT_ARRAY)
{
/* We allow to specify any type for a .note section. */
- if (ssect->type != SHT_NOTE)
+ if (ssect->type != SHT_NOTE
+ /* Processor and application defined types are allowed too. */
+ && type < SHT_LOPROC)
as_warn (_("setting incorrect section type for %s"),
name);
}
}
}
- if (old_sec == NULL && (attr & ~ssect->attr) != 0)
+ if (old_sec == NULL && ((attr & ~(SHF_MASKOS | SHF_MASKPROC))
+ & ~ssect->attr) != 0)
{
/* As a GNU extension, we permit a .note section to be
allocatable. If the linker sees an allocatable .note
/* A section on Alpha may have SHF_ALPHA_GPREL. */
else if ((attr & ~ssect->attr) == SHF_ALPHA_GPREL)
override = TRUE;
+#endif
+#ifdef TC_RX
+ else if (attr == (SHF_EXECINSTR | SHF_WRITE | SHF_ALLOC)
+ && (ssect->type == SHT_INIT_ARRAY
+ || ssect->type == SHT_FINI_ARRAY
+ || ssect->type == SHT_PREINIT_ARRAY))
+ /* RX init/fini arrays can and should have the "awx" attributes set. */
+ ;
#endif
else
{
override = TRUE;
}
}
+
if (!override && old_sec == NULL)
attr |= ssect->attr;
}
| SEC_LINK_ONCE | SEC_LINK_DUPLICATES_DISCARD
| SEC_THREAD_LOCAL)))
as_warn (_("ignoring changed section attributes for %s"), name);
+ else
+ /* FIXME: Maybe we should consider removing a previously set
+ processor or application specific attribute as suspicious ? */
+ elf_section_flags (sec) = attr;
+
if ((flags & SEC_MERGE) && old_sec->entsize != (unsigned) entsize)
as_warn (_("ignoring changed section entity size for %s"), name);
}
}
static bfd_vma
-obj_elf_parse_section_letters (char *str, size_t len, bfd_boolean *clone)
+obj_elf_parse_section_letters (char *str, size_t len, bfd_boolean *is_clone)
{
bfd_vma attr = 0;
- *clone = FALSE;
+ *is_clone = FALSE;
while (len > 0)
{
attr |= SHF_TLS;
break;
case '?':
- *clone = TRUE;
+ *is_clone = TRUE;
break;
/* Compatibility. */
case 'm':
}
default:
{
- char *bad_msg = _("unrecognized .section attribute: want a,e,w,x,M,S,G,T");
+ const char *bad_msg = _("unrecognized .section attribute:"
+ " want a,e,w,x,M,S,G,T or number");
#ifdef md_elf_section_letter
bfd_vma md_attr = md_elf_section_letter (*str, &bad_msg);
if (md_attr != (bfd_vma) -1)
attr |= md_attr;
else
#endif
- as_fatal ("%s", bad_msg);
+ if (ISDIGIT (*str))
+ {
+ char * end;
+
+ attr |= strtoul (str, & end, 0);
+ /* Update str and len, allowing for the fact that
+ we will execute str++ and len-- below. */
+ end --;
+ len -= (end - str);
+ str = end;
+ }
+ else
+ as_fatal ("%s", bad_msg);
}
break;
}
}
#endif
+ if (ISDIGIT (*str))
+ {
+ char * end;
+ int type = strtoul (str, & end, 0);
+
+ if (warn && (size_t) (end - str) != len)
+ as_warn (_("extraneous characters at end of numeric section type"));
+
+ return type;
+ }
+
if (warn)
as_warn (_("unrecognized section type"));
return 0;
}
/* Get name of section. */
-char *
+const char *
obj_elf_section_name (void)
{
char *name;
return NULL;
}
- name = (char *) xmalloc (end - input_line_pointer + 1);
- memcpy (name, input_line_pointer, end - input_line_pointer);
- name[end - input_line_pointer] = '\0';
+ name = xmemdup0 (input_line_pointer, end - input_line_pointer);
+
+ while (flag_sectname_subst)
+ {
+ char *subst = strchr (name, '%');
+ if (subst && subst[1] == 'S')
+ {
+ int oldlen = strlen (name);
+ int substlen = strlen (now_seg->name);
+ int newlen = oldlen - 2 + substlen;
+ char *newname = (char *) xmalloc (newlen + 1);
+ int headlen = subst - name;
+ memcpy (newname, name, headlen);
+ strcpy (newname + headlen, now_seg->name);
+ strcat (newname + headlen, subst + 2);
+ xfree (name);
+ name = newname;
+ }
+ else
+ break;
+ }
+
#ifdef tc_canonicalize_section_name
name = tc_canonicalize_section_name (name);
#endif
void
obj_elf_section (int push)
{
- char *name, *group_name, *beg;
+ const char *name, *group_name;
+ char *beg;
int type, dummy;
bfd_vma attr;
int entsize;
if (*input_line_pointer == '"')
{
- bfd_boolean clone;
+ bfd_boolean is_clone;
beg = demand_copy_C_string (&dummy);
if (beg == NULL)
{
ignore_rest_of_line ();
- xfree (name);
return;
}
- attr |= obj_elf_parse_section_letters (beg, strlen (beg), &clone);
+ attr |= obj_elf_parse_section_letters (beg, strlen (beg), &is_clone);
SKIP_WHITESPACE ();
if (*input_line_pointer == ',')
if (beg == NULL)
{
ignore_rest_of_line ();
- xfree (name);
return;
}
type = obj_elf_section_type (beg, strlen (beg), TRUE);
}
else if (c == '@' || c == '%')
{
- beg = ++input_line_pointer;
- c = get_symbol_end ();
- *input_line_pointer = c;
- type = obj_elf_section_type (beg, input_line_pointer - beg, TRUE);
+ ++input_line_pointer;
+
+ if (ISDIGIT (* input_line_pointer))
+ {
+ type = strtoul (input_line_pointer, & input_line_pointer, 0);
+ }
+ else
+ {
+ c = get_symbol_name (& beg);
+ (void) restore_line_pointer (c);
+ type = obj_elf_section_type (beg, input_line_pointer - beg, TRUE);
+ }
}
else
input_line_pointer = save;
attr &= ~SHF_MERGE;
}
- if ((attr & SHF_GROUP) != 0 && clone)
+ if ((attr & SHF_GROUP) != 0 && is_clone)
{
as_warn (_("? section flag ignored with G present"));
- clone = FALSE;
+ is_clone = FALSE;
}
if ((attr & SHF_GROUP) != 0 && *input_line_pointer == ',')
{
group_name = obj_elf_section_name ();
if (group_name == NULL)
attr &= ~SHF_GROUP;
- else if (strncmp (input_line_pointer, ",comdat", 7) == 0)
+ else if (*input_line_pointer == ',')
{
- input_line_pointer += 7;
- linkonce = 1;
+ ++input_line_pointer;
+ SKIP_WHITESPACE ();
+ if (strncmp (input_line_pointer, "comdat", 6) == 0)
+ {
+ input_line_pointer += 6;
+ linkonce = 1;
+ }
}
else if (strncmp (name, ".gnu.linkonce", 13) == 0)
linkonce = 1;
attr &= ~SHF_GROUP;
}
- if (clone)
+ if (is_clone)
{
const char *now_group = elf_group_name (now_seg);
if (now_group != NULL)
{
as_bad (_("character following name is not '#'"));
ignore_rest_of_line ();
- xfree (name);
return;
}
- beg = ++input_line_pointer;
- c = get_symbol_end ();
- *input_line_pointer = c;
+ ++input_line_pointer;
+ c = get_symbol_name (& beg);
+ (void) restore_line_pointer (c);
attr |= obj_elf_section_word (beg, input_line_pointer - beg, & type);
++input_line_pointer;
SKIP_WHITESPACE ();
- name = input_line_pointer;
/* Temporarily include '@' in symbol names. */
old_lexat = lex_type[(unsigned char) '@'];
lex_type[(unsigned char) '@'] |= LEX_NAME;
- c = get_symbol_end ();
+ c = get_symbol_name (& name);
lex_type[(unsigned char) '@'] = old_lexat;
if (symbol_get_obj (sym)->versioned_name == NULL)
{
symbol_get_obj (sym)->versioned_name = xstrdup (name);
- *input_line_pointer = c;
+ (void) restore_line_pointer (c);
if (strchr (symbol_get_obj (sym)->versioned_name,
ELF_VER_CHR) == NULL)
return;
}
- *input_line_pointer = c;
+ (void) restore_line_pointer (c);
}
demand_empty_rest_of_line ();
if (*input_line_pointer == '#')
++input_line_pointer;
- cname = input_line_pointer;
- c = get_symbol_end ();
+ c = get_symbol_name (& cname);
csym = symbol_find (cname);
/* GCFIXME: should check that we don't have two .vtable_inherits for
*input_line_pointer = c;
- SKIP_WHITESPACE ();
+ SKIP_WHITESPACE_AFTER_NAME ();
if (*input_line_pointer != ',')
{
as_bad (_("expected comma after name in .vtable_inherit"));
}
else
{
- pname = input_line_pointer;
- c = get_symbol_end ();
+ c = get_symbol_name (& pname);
psym = symbol_find_or_make (pname);
- *input_line_pointer = c;
+ restore_line_pointer (c);
}
demand_empty_rest_of_line ();
BFD_RELOC_VTABLE_ENTRY);
}
+#define skip_whitespace(str) do { if (*(str) == ' ') ++(str); } while (0)
+
+static inline int
+skip_past_char (char ** str, char c)
+{
+ if (**str == c)
+ {
+ (*str)++;
+ return 0;
+ }
+ else
+ return -1;
+}
+#define skip_past_comma(str) skip_past_char (str, ',')
+
+/* A list of attributes that have been explicitly set by the assembly code.
+ VENDOR is the vendor id, BASE is the tag shifted right by the number
+ of bits in MASK, and bit N of MASK is set if tag BASE+N has been set. */
+struct recorded_attribute_info {
+ struct recorded_attribute_info *next;
+ int vendor;
+ unsigned int base;
+ unsigned long mask;
+};
+static struct recorded_attribute_info *recorded_attributes;
+
+/* Record that we have seen an explicit specification of attribute TAG
+ for vendor VENDOR. */
+
+static void
+record_attribute (int vendor, unsigned int tag)
+{
+ unsigned int base;
+ unsigned long mask;
+ struct recorded_attribute_info *rai;
+
+ base = tag / (8 * sizeof (rai->mask));
+ mask = 1UL << (tag % (8 * sizeof (rai->mask)));
+ for (rai = recorded_attributes; rai; rai = rai->next)
+ if (rai->vendor == vendor && rai->base == base)
+ {
+ rai->mask |= mask;
+ return;
+ }
+
+ rai = XNEW (struct recorded_attribute_info);
+ rai->next = recorded_attributes;
+ rai->vendor = vendor;
+ rai->base = base;
+ rai->mask = mask;
+ recorded_attributes = rai;
+}
+
+/* Return true if we have seen an explicit specification of attribute TAG
+ for vendor VENDOR. */
+
+bfd_boolean
+obj_elf_seen_attribute (int vendor, unsigned int tag)
+{
+ unsigned int base;
+ unsigned long mask;
+ struct recorded_attribute_info *rai;
+
+ base = tag / (8 * sizeof (rai->mask));
+ mask = 1UL << (tag % (8 * sizeof (rai->mask)));
+ for (rai = recorded_attributes; rai; rai = rai->next)
+ if (rai->vendor == vendor && rai->base == base)
+ return (rai->mask & mask) != 0;
+ return FALSE;
+}
+
+/* Parse an attribute directive for VENDOR.
+ Returns the attribute number read, or zero on error. */
+
+int
+obj_elf_vendor_attribute (int vendor)
+{
+ expressionS exp;
+ int type;
+ int tag;
+ unsigned int i = 0;
+ char *s = NULL;
+
+ /* Read the first number or name. */
+ skip_whitespace (input_line_pointer);
+ s = input_line_pointer;
+ if (ISDIGIT (*input_line_pointer))
+ {
+ expression (& exp);
+ if (exp.X_op != O_constant)
+ goto bad;
+ tag = exp.X_add_number;
+ }
+ else
+ {
+ char *name;
+
+ /* A name may contain '_', but no other punctuation. */
+ for (; ISALNUM (*input_line_pointer) || *input_line_pointer == '_';
+ ++input_line_pointer)
+ i++;
+ if (i == 0)
+ goto bad;
+
+ name = xstrndup (s, i);
+
+#ifndef CONVERT_SYMBOLIC_ATTRIBUTE
+#define CONVERT_SYMBOLIC_ATTRIBUTE(a) -1
+#endif
+
+ tag = CONVERT_SYMBOLIC_ATTRIBUTE (name);
+ if (tag == -1)
+ {
+ as_bad (_("Attribute name not recognised: %s"), name);
+ ignore_rest_of_line ();
+ free (name);
+ return 0;
+ }
+ free (name);
+ }
+
+ type = _bfd_elf_obj_attrs_arg_type (stdoutput, vendor, tag);
+
+ if (skip_past_comma (&input_line_pointer) == -1)
+ goto bad;
+ if (type & 1)
+ {
+ expression (& exp);
+ if (exp.X_op != O_constant)
+ {
+ as_bad (_("expected numeric constant"));
+ ignore_rest_of_line ();
+ return 0;
+ }
+ i = exp.X_add_number;
+ }
+ if ((type & 3) == 3
+ && skip_past_comma (&input_line_pointer) == -1)
+ {
+ as_bad (_("expected comma"));
+ ignore_rest_of_line ();
+ return 0;
+ }
+ if (type & 2)
+ {
+ int len;
+
+ skip_whitespace (input_line_pointer);
+ if (*input_line_pointer != '"')
+ goto bad_string;
+ s = demand_copy_C_string (&len);
+ }
+
+ record_attribute (vendor, tag);
+ switch (type & 3)
+ {
+ case 3:
+ bfd_elf_add_obj_attr_int_string (stdoutput, vendor, tag, i, s);
+ break;
+ case 2:
+ bfd_elf_add_obj_attr_string (stdoutput, vendor, tag, s);
+ break;
+ case 1:
+ bfd_elf_add_obj_attr_int (stdoutput, vendor, tag, i);
+ break;
+ default:
+ abort ();
+ }
+
+ demand_empty_rest_of_line ();
+ return tag;
+bad_string:
+ as_bad (_("bad string constant"));
+ ignore_rest_of_line ();
+ return 0;
+bad:
+ as_bad (_("expected <tag> , <value>"));
+ ignore_rest_of_line ();
+ return 0;
+}
+
+/* Parse a .gnu_attribute directive. */
+
+static void
+obj_elf_gnu_attribute (int ignored ATTRIBUTE_UNUSED)
+{
+ obj_elf_vendor_attribute (OBJ_ATTR_GNU);
+}
+
void
elf_obj_read_begin_hook (void)
{
if (srcelf->size)
{
if (destelf->size == NULL)
- destelf->size = (expressionS *) xmalloc (sizeof (expressionS));
+ destelf->size = XNEW (expressionS);
*destelf->size = *srcelf->size;
}
else
static void
obj_elf_size (int ignore ATTRIBUTE_UNUSED)
{
- char *name = input_line_pointer;
- char c = get_symbol_end ();
+ char *name;
+ char c = get_symbol_name (&name);
char *p;
expressionS exp;
symbolS *sym;
p = input_line_pointer;
*p = c;
- SKIP_WHITESPACE ();
+ SKIP_WHITESPACE_AFTER_NAME ();
if (*input_line_pointer != ',')
{
*p = 0;
}
else
{
- symbol_get_obj (sym)->size =
- (expressionS *) xmalloc (sizeof (expressionS));
+ symbol_get_obj (sym)->size = XNEW (expressionS);
*symbol_get_obj (sym)->size = exp;
}
demand_empty_rest_of_line ();
*input_line_pointer = '\0';
}
else
- *cp = get_symbol_end ();
+ *cp = get_symbol_name (&p);
return p;
}
const struct elf_backend_data *bed;
bed = get_elf_backend_data (stdoutput);
- if (!(bed->elf_osabi == ELFOSABI_LINUX
- /* GNU/Linux is still using the default value 0. */
+ if (!(bed->elf_osabi == ELFOSABI_GNU
+ || bed->elf_osabi == ELFOSABI_FREEBSD
+ /* GNU is still using the default value 0. */
|| bed->elf_osabi == ELFOSABI_NONE))
- as_bad (_("symbol type \"%s\" is supported only by GNU targets"),
+ as_bad (_("symbol type \"%s\" is supported only by GNU and FreeBSD targets"),
type_name);
type = BSF_FUNCTION | BSF_GNU_INDIRECT_FUNCTION;
}
struct elf_backend_data *bed;
bed = (struct elf_backend_data *) get_elf_backend_data (stdoutput);
- if (!(bed->elf_osabi == ELFOSABI_LINUX
- /* GNU/Linux is still using the default value 0. */
+ if (!(bed->elf_osabi == ELFOSABI_GNU
+ /* GNU is still using the default value 0. */
|| bed->elf_osabi == ELFOSABI_NONE))
as_bad (_("symbol type \"%s\" is supported only by GNU targets"),
type_name);
type = BSF_OBJECT | BSF_GNU_UNIQUE;
- /* PR 10549: Always set OSABI field to LINUX for objects containing unique symbols. */
- bed->elf_osabi = ELFOSABI_LINUX;
+ /* PR 10549: Always set OSABI field to GNU for objects containing unique symbols. */
+ bed->elf_osabi = ELFOSABI_GNU;
}
#ifdef md_elf_symbol_type
else if ((type = md_elf_symbol_type (type_name, sym, elfsym)) != -1)
void
obj_elf_init_stab_section (segT seg)
{
- char *file;
+ const char *file;
char *p;
char *stabstr_name;
unsigned int stroff;
p = frag_more (12);
/* Zero it out. */
memset (p, 0, 12);
- as_where (&file, NULL);
- stabstr_name = (char *) xmalloc (strlen (segment_name (seg)) + 4);
- strcpy (stabstr_name, segment_name (seg));
- strcat (stabstr_name, "str");
+ file = as_where (NULL);
+ stabstr_name = concat (segment_name (seg), "str", (char *) NULL);
stroff = get_stab_string_offset (file, stabstr_name);
know (stroff == 1 || (stroff == 0 && file[0] == '\0'));
md_number_to_chars (p, stroff, 4);
if (!strcmp ("str", sec->name + strlen (sec->name) - 3))
return;
- name = (char *) alloca (strlen (sec->name) + 4);
- strcpy (name, sec->name);
- strcat (name, "str");
+ name = concat (sec->name, "str", NULL);
strsec = bfd_get_section_by_name (abfd, name);
if (strsec)
strsz = bfd_section_size (abfd, strsec);
bfd_h_put_16 (abfd, nsyms, p + 6);
bfd_h_put_32 (abfd, strsz, p + 8);
+ free (name);
}
#ifdef NEED_ECOFF_DEBUG
S_SET_SIZE (symp, size->X_add_number);
else
{
- if (flag_size_check == size_check_error)
+ if (!flag_allow_nonconst_size)
as_bad (_(".size expression for %s "
"does not evaluate to a constant"), S_GET_NAME (symp));
else
char *p;
p = strchr (sy_obj->versioned_name, ELF_VER_CHR);
- know (p != NULL);
+ if (p == NULL)
+ /* We will have already reported an error about a missing version. */
+ *puntp = TRUE;
/* This symbol was given a new name with the .symver directive.
symbol. However, it's not clear whether it is the best
approach. */
- if (! S_IS_DEFINED (symp))
+ else if (! S_IS_DEFINED (symp))
{
/* Verify that the name isn't using the @@ syntax--this is
reserved for definitions of the default version to link
against. */
if (p[1] == ELF_VER_CHR)
{
- as_bad (_("invalid attempt to declare external version name as default in symbol `%s'"),
+ as_bad (_("invalid attempt to declare external version name"
+ " as default in symbol `%s'"),
sy_obj->versioned_name);
*puntp = TRUE;
}
list->num_group += 1;
/* Add index to hash. */
- idx_ptr = (unsigned int *) xmalloc (sizeof (unsigned int));
+ idx_ptr = XNEW (unsigned int);
*idx_ptr = i;
hash_insert (list->indexes, group_name, idx_ptr);
}
list.elt_count = NULL;
list.indexes = hash_new ();
bfd_map_over_sections (stdoutput, build_group_lists, &list);
-
+
/* Make the SHT_GROUP sections that describe each section group. We
can't set up the section contents here yet, because elf section
indices have yet to be calculated. elf.c:set_group_contents does
p = strchr (symbol_get_obj (symp)->versioned_name,
ELF_VER_CHR);
- know (p != NULL);
- if (p[1] == ELF_VER_CHR && p[2] == ELF_VER_CHR)
+ if (p != NULL && p[1] == ELF_VER_CHR && p[2] == ELF_VER_CHR)
{
size_t l = strlen (&p[3]) + 1;
memmove (&p[1], &p[3], l);
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