/* write.c - emit .o file
- Copyright (C) 1986-2018 Free Software Foundation, Inc.
+ Copyright (C) 1986-2019 Free Software Foundation, Inc.
This file is part of GAS, the GNU Assembler.
static fixS *
fix_new_internal (fragS *frag, /* Which frag? */
- int where, /* Where in that frag? */
- int size, /* 1, 2, or 4 usually. */
+ unsigned long where, /* Where in that frag? */
+ unsigned long size, /* 1, 2, or 4 usually. */
symbolS *add_symbol, /* X_add_symbol. */
symbolS *sub_symbol, /* X_op_symbol. */
offsetT offset, /* X_add_number. */
/* We've made fx_size a narrow field; check that it's wide enough. */
if (fixP->fx_size != size)
{
- as_bad (_("field fx_size too small to hold %d"), size);
+ as_bad (_("field fx_size too small to hold %lu"), size);
abort ();
}
fixP->fx_addsy = add_symbol;
fixP->fx_dot_frag = dot_frag;
fixP->fx_pcrel = pcrel;
fixP->fx_r_type = r_type;
- fixP->fx_im_disp = 0;
fixP->fx_pcrel_adjust = 0;
- fixP->fx_bit_fixP = 0;
fixP->fx_addnumber = 0;
fixP->fx_tcbit = 0;
fixP->fx_tcbit2 = 0;
/* Create a fixup relative to a symbol (plus a constant). */
fixS *
-fix_new (fragS *frag, /* Which frag? */
- int where, /* Where in that frag? */
- int size, /* 1, 2, or 4 usually. */
- symbolS *add_symbol, /* X_add_symbol. */
+fix_new (fragS *frag, /* Which frag? */
+ unsigned long where, /* Where in that frag? */
+ unsigned long size, /* 1, 2, or 4 usually. */
+ symbolS *add_symbol, /* X_add_symbol. */
offsetT offset, /* X_add_number. */
int pcrel, /* TRUE if PC-relative relocation. */
RELOC_ENUM r_type /* Relocation type. */)
fixS *
fix_new_exp (fragS *frag, /* Which frag? */
- int where, /* Where in that frag? */
- int size, /* 1, 2, or 4 usually. */
+ unsigned long where, /* Where in that frag? */
+ unsigned long size, /* 1, 2, or 4 usually. */
expressionS *exp, /* Expression. */
int pcrel, /* TRUE if PC-relative relocation. */
RELOC_ENUM r_type /* Relocation type. */)
as for fix_new, except that WHERE is implicitly 0. */
fixS *
-fix_at_start (fragS *frag, int size, symbolS *add_symbol,
+fix_at_start (fragS *frag, unsigned long size, symbolS *add_symbol,
offsetT offset, int pcrel, RELOC_ENUM r_type)
{
return fix_new_internal (frag, 0, size, add_symbol,
if (seg == absolute_section)
return;
- if (align > bfd_get_section_alignment (stdoutput, seg))
- bfd_set_section_alignment (stdoutput, seg, align);
+ if (align > bfd_section_alignment (seg))
+ bfd_set_section_alignment (seg, align);
}
int
if (seg == absolute_section)
return 0;
- return bfd_get_section_alignment (stdoutput, seg);
+ return bfd_section_alignment (seg);
}
/* Reset the section indices after removing the gas created sections. */
if (fragP->fr_offset < 0)
{
as_bad_where (fragP->fr_file, fragP->fr_line,
- _("attempt to .org/.space/.nop backwards? (%ld)"),
+ _("attempt to .org/.space/.nops backwards? (%ld)"),
(long) fragP->fr_offset);
fragP->fr_offset = 0;
}
md_convert_frag (stdoutput, sec, fragP);
gas_assert (fragP->fr_next == NULL
- || ((offsetT) (fragP->fr_next->fr_address - fragP->fr_address)
- == fragP->fr_fix));
+ || (fragP->fr_next->fr_address - fragP->fr_address
+ == fragP->fr_fix));
/* After md_convert_frag, we make the frag into a ".space 0".
md_convert_frag() should set up any fixSs and constants
}
static void
-size_seg (bfd *abfd, asection *sec, void *xxx ATTRIBUTE_UNUSED)
+size_seg (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, void *xxx ATTRIBUTE_UNUSED)
{
flagword flags;
fragS *fragp;
else
size = 0;
- flags = bfd_get_section_flags (abfd, sec);
- if (size == 0 && bfd_get_section_size (sec) != 0 &&
+ flags = bfd_section_flags (sec);
+ if (size == 0 && bfd_section_size (sec) != 0 &&
(flags & SEC_HAS_CONTENTS) != 0)
return;
flags |= SEC_HAS_CONTENTS;
flags &= ~SEC_RELOC;
- x = bfd_set_section_flags (abfd, sec, flags);
+ x = bfd_set_section_flags (sec, flags);
gas_assert (x);
/* If permitted, allow the backend to pad out the section
newsize = size;
else
newsize = md_section_align (sec, size);
- x = bfd_set_section_size (abfd, sec, newsize);
+ x = bfd_set_section_size (sec, newsize);
gas_assert (x);
/* If the size had to be rounded up, add some padding in the last
/* If the linker is doing the relaxing, we must not do any fixups.
Well, strictly speaking that's not true -- we could do any that
- are PC-relative and don't cross regions that could change size.
- And for the i960 we might be able to turn callx/callj into bal
- anyways in cases where we know the maximum displacement. */
+ are PC-relative and don't cross regions that could change size. */
if (linkrelax && TC_LINKRELAX_FIXUP (this_segment))
{
for (; fixP; fixP = fixP->fx_next)
symbol_mark_used_in_reloc (fixP->fx_subsy);
}
- if (!fixP->fx_bit_fixP && !fixP->fx_no_overflow && fixP->fx_size != 0)
+ if (!fixP->fx_no_overflow && fixP->fx_size != 0)
{
if (fixP->fx_size < sizeof (valueT))
{
(long) add_number,
(long) (fragP->fr_address + fixP->fx_where));
#endif
- } /* Not a bit fix. */
+ }
#ifdef TC_VALIDATE_FIX
skip: ATTRIBUTE_UNUSED_LABEL
}
static void
-write_relocs (bfd *abfd, asection *sec, void *xxx ATTRIBUTE_UNUSED)
+write_relocs (bfd *abfd ATTRIBUTE_UNUSED, asection *sec,
+ void *xxx ATTRIBUTE_UNUSED)
{
segment_info_type *seginfo = seg_info (sec);
unsigned int n;
/* Extract relocs for this section from reloc_list. */
rp = &reloc_list;
+
my_reloc_list = NULL;
while ((r = *rp) != NULL)
{
for (fixp = seginfo->fix_root; fixp != (fixS *) NULL; fixp = fixp->fx_next)
{
int fx_size, slack;
- offsetT loc;
+ valueT loc;
arelent **reloc;
#ifndef RELOC_EXPANSION_POSSIBLE
arelent *rel;
if (n)
{
- flagword flags = bfd_get_section_flags (abfd, sec);
+ flagword flags = bfd_section_flags (sec);
flags |= SEC_RELOC;
- bfd_set_section_flags (abfd, sec, flags);
+ bfd_set_section_flags (sec, flags);
bfd_set_reloc (stdoutput, sec, relocs, n);
}
char *header;
struct z_stream_s *strm;
int x;
- flagword flags = bfd_get_section_flags (abfd, sec);
+ flagword flags = bfd_section_flags (sec);
unsigned int header_size, compression_header_size;
if (seginfo == NULL
|| (flags & (SEC_ALLOC | SEC_HAS_CONTENTS)) == SEC_ALLOC)
return;
- section_name = bfd_get_section_name (stdoutput, sec);
+ section_name = bfd_section_name (sec);
if (strncmp (section_name, ".debug_", 7) != 0)
return;
/* Update the section size and its name. */
bfd_update_compression_header (abfd, (bfd_byte *) header, sec);
- x = bfd_set_section_size (abfd, sec, compressed_size);
+ x = bfd_set_section_size (sec, compressed_size);
gas_assert (x);
if (!compression_header_size)
{
compressed_name = concat (".z", section_name + 1, (char *) NULL);
- bfd_section_name (stdoutput, sec) = compressed_name;
+ bfd_rename_section (sec, compressed_name);
}
}
offsetT count ATTRIBUTE_UNUSED,
int control ATTRIBUTE_UNUSED)
{
- as_bad (_("unimplemented .nop directive"));
+ as_bad (_("unimplemented .nops directive"));
}
#endif
/* Write out the frags. */
if (seginfo == NULL
- || !(bfd_get_section_flags (abfd, sec) & SEC_HAS_CONTENTS))
+ || !(bfd_section_flags (sec) & SEC_HAS_CONTENTS))
return;
for (f = seginfo->frchainP->frch_root;
do_not_pad_sections_to_alignment = 1;
alignment = SUB_SEGMENT_ALIGN (now_seg, frchainP);
- if ((bfd_get_section_flags (now_seg->owner, now_seg) & SEC_MERGE)
+ if ((bfd_section_flags (now_seg) & SEC_MERGE)
&& now_seg->entsize)
{
unsigned int entsize = now_seg->entsize;
const char *name;
size = bfd_elf_obj_attr_size (stdoutput);
- if (size)
+ if (size == 0)
+ return;
+
+ name = get_elf_backend_data (stdoutput)->obj_attrs_section;
+ if (!name)
+ name = ".gnu.attributes";
+ s = subseg_new (name, 0);
+ elf_section_type (s)
+ = get_elf_backend_data (stdoutput)->obj_attrs_section_type;
+ bfd_set_section_flags (s, SEC_READONLY | SEC_DATA);
+ frag_now_fix ();
+ p = frag_more (size);
+ bfd_elf_set_obj_attr_contents (stdoutput, (bfd_byte *)p, size);
+
+ subsegs_finish_section (s);
+ relax_segment (seg_info (s)->frchainP->frch_root, s, 0);
+ size_seg (stdoutput, s, NULL);
+}
+
+/* Create a relocation against an entry in a GNU Build attribute section. */
+
+static void
+create_note_reloc (segT sec,
+ symbolS * sym,
+ bfd_size_type note_offset,
+ bfd_size_type desc2_offset,
+ int reloc_type,
+ bfd_vma addend,
+ char * note)
+{
+ struct reloc_list * reloc;
+
+ reloc = XNEW (struct reloc_list);
+
+ /* We create a .b type reloc as resolve_reloc_expr_symbols() has already been called. */
+ reloc->u.b.sec = sec;
+ reloc->u.b.s = symbol_get_bfdsym (sym);
+ reloc->u.b.r.sym_ptr_ptr = & reloc->u.b.s;
+ reloc->u.b.r.address = note_offset + desc2_offset;
+ reloc->u.b.r.addend = addend;
+ reloc->u.b.r.howto = bfd_reloc_type_lookup (stdoutput, reloc_type);
+
+ if (reloc->u.b.r.howto == NULL)
{
- name = get_elf_backend_data (stdoutput)->obj_attrs_section;
- if (!name)
- name = ".gnu.attributes";
- s = subseg_new (name, 0);
- elf_section_type (s)
- = get_elf_backend_data (stdoutput)->obj_attrs_section_type;
- bfd_set_section_flags (stdoutput, s, SEC_READONLY | SEC_DATA);
- frag_now_fix ();
- p = frag_more (size);
- bfd_elf_set_obj_attr_contents (stdoutput, (bfd_byte *)p, size);
-
- subsegs_finish_section (s);
- relax_segment (seg_info (s)->frchainP->frch_root, s, 0);
- size_seg (stdoutput, s, NULL);
+ as_bad (_("unable to create reloc for build note"));
+ return;
+ }
+
+ reloc->file = N_("<gnu build note>");
+ reloc->line = 0;
+
+ reloc->next = reloc_list;
+ reloc_list = reloc;
+
+ /* For REL relocs, store the addend in the section. */
+ if (! sec->use_rela_p
+ /* The SH target is a special case that uses RELA relocs
+ but still stores the addend in the word being relocated. */
+ || strstr (bfd_get_target (stdoutput), "-sh") != NULL)
+ {
+ if (target_big_endian)
+ {
+ if (bfd_arch_bits_per_address (stdoutput) <= 32)
+ note[desc2_offset + 3] = addend;
+ else
+ note[desc2_offset + 7] = addend;
+ }
+ else
+ note[desc2_offset] = addend;
}
}
-#endif
+
+static void
+maybe_generate_build_notes (void)
+{
+ segT sec;
+ char * note;
+ offsetT note_size;
+ offsetT total_size;
+ offsetT desc_size;
+ offsetT desc2_offset;
+ int desc_reloc;
+ symbolS * sym;
+ asymbol * bsym;
+
+ if (! flag_generate_build_notes
+ || bfd_get_section_by_name (stdoutput,
+ GNU_BUILD_ATTRS_SECTION_NAME) != NULL)
+ return;
+
+ /* Create a GNU Build Attribute section. */
+ sec = subseg_new (GNU_BUILD_ATTRS_SECTION_NAME, FALSE);
+ elf_section_type (sec) = SHT_NOTE;
+ bfd_set_section_flags (sec, (SEC_READONLY | SEC_HAS_CONTENTS | SEC_DATA
+ | SEC_OCTETS));
+ bfd_set_section_alignment (sec, 2);
+
+ /* Work out the size of the notes that we will create,
+ and the relocation we should use. */
+ if (bfd_arch_bits_per_address (stdoutput) <= 32)
+ {
+ note_size = 28;
+ desc_size = 8; /* Two 4-byte offsets. */
+ desc2_offset = 24;
+
+ /* FIXME: The BFD backend for the CRX target does not support the
+ BFD_RELOC_32, even though it really should. Likewise for the
+ CR16 target. So we have special case code here... */
+ if (strstr (bfd_get_target (stdoutput), "-crx") != NULL)
+ desc_reloc = BFD_RELOC_CRX_NUM32;
+ else if (strstr (bfd_get_target (stdoutput), "-cr16") != NULL)
+ desc_reloc = BFD_RELOC_CR16_NUM32;
+ else
+ desc_reloc = BFD_RELOC_32;
+ }
+ else
+ {
+ note_size = 36;
+ desc_size = 16; /* Two 8-byte offsets. */
+ desc2_offset = 28;
+ /* FIXME: The BFD backend for the IA64 target does not support the
+ BFD_RELOC_64, even though it really should. The HPPA backend
+ has a similar issue, although it does not support BFD_RELOCs at
+ all! So we have special case code to handle these targets. */
+ if (strstr (bfd_get_target (stdoutput), "-ia64") != NULL)
+ desc_reloc = target_big_endian ? BFD_RELOC_IA64_DIR32MSB : BFD_RELOC_IA64_DIR32LSB;
+ else if (strstr (bfd_get_target (stdoutput), "-hppa") != NULL)
+ desc_reloc = 80; /* R_PARISC_DIR64. */
+ else
+ desc_reloc = BFD_RELOC_64;
+ }
+
+ /* We have to create a note for *each* code section.
+ Linker garbage collection might discard some. */
+ total_size = 0;
+ note = NULL;
+
+ for (sym = symbol_rootP; sym != NULL; sym = symbol_next (sym))
+ if ((bsym = symbol_get_bfdsym (sym)) != NULL
+ && bsym->flags & BSF_SECTION_SYM
+ && bsym->section != NULL
+ /* Skip linkonce sections - we cannot use these section symbols as they may disappear. */
+ && (bsym->section->flags & (SEC_CODE | SEC_LINK_ONCE)) == SEC_CODE
+ /* Not all linkonce sections are flagged... */
+ && strncmp (S_GET_NAME (sym), ".gnu.linkonce", sizeof ".gnu.linkonce" - 1) != 0)
+ {
+ /* Create a version note. */
+ frag_now_fix ();
+ note = frag_more (note_size);
+ memset (note, 0, note_size);
+
+ if (target_big_endian)
+ {
+ note[3] = 8; /* strlen (name) + 1. */
+ note[7] = desc_size; /* Two 8-byte offsets. */
+ note[10] = NT_GNU_BUILD_ATTRIBUTE_OPEN >> 8;
+ note[11] = NT_GNU_BUILD_ATTRIBUTE_OPEN & 0xff;
+ }
+ else
+ {
+ note[0] = 8; /* strlen (name) + 1. */
+ note[4] = desc_size; /* Two 8-byte offsets. */
+ note[8] = NT_GNU_BUILD_ATTRIBUTE_OPEN & 0xff;
+ note[9] = NT_GNU_BUILD_ATTRIBUTE_OPEN >> 8;
+ }
+
+ /* The a1 version number indicates that this note was
+ generated by the assembler and not the gcc annobin plugin. */
+ memcpy (note + 12, "GA$\ 13a1", 8);
+
+ /* Create a relocation to install the start address of the note... */
+ create_note_reloc (sec, sym, total_size, 20, desc_reloc, 0, note);
+
+ /* ...and another one to install the end address. */
+ create_note_reloc (sec, sym, total_size, desc2_offset, desc_reloc,
+ bfd_section_size (bsym->section),
+ note);
+
+ total_size += note_size;
+ /* FIXME: Maybe add a note recording the assembler command line and version ? */
+ }
+
+ /* Install the note(s) into the section. */
+ if (total_size)
+ bfd_set_section_contents (stdoutput, sec, (bfd_byte *) note, 0, total_size);
+ subsegs_finish_section (sec);
+ relax_segment (seg_info (sec)->frchainP->frch_root, sec, 0);
+ size_seg (stdoutput, sec, NULL);
+}
+#endif /* OBJ_ELF */
/* Write the object file. */
resolve_local_symbol_values ();
resolve_reloc_expr_symbols ();
+#ifdef OBJ_ELF
+ if (IS_ELF)
+ maybe_generate_build_notes ();
+#endif
+
PROGRESS (1);
#ifdef tc_frob_file_before_adjust
#ifdef obj_coff_generate_pdata
obj_coff_generate_pdata ();
#endif
+
bfd_map_over_sections (stdoutput, write_relocs, (char *) 0);
#ifdef tc_frob_file_after_relocs
}
#ifdef TC_GENERIC_RELAX_TABLE
+#ifndef md_generic_table_relax_frag
+#define md_generic_table_relax_frag relax_frag
+#endif
+
/* Relax a fragment by scanning TC_GENERIC_RELAX_TABLE. */
long
const relax_typeS *table;
target = fragP->fr_offset;
- address = fragP->fr_address;
+ address = fragP->fr_address + fragP->fr_fix;
table = TC_GENERIC_RELAX_TABLE;
this_state = fragP->fr_subtype;
start_type = this_type = table + this_state;
negative. Don't allow this in case the negative reach is
large enough to require a larger branch instruction. */
else if (target < address)
- target = fragP->fr_next->fr_address + stretch;
+ return 0;
}
}
- aim = target - address - fragP->fr_fix;
+ aim = target - address;
#ifdef TC_PCREL_ADJUST
- /* Currently only the ns32k family needs this. */
+ /* Currently only the ns32k and arc needs this. */
aim += TC_PCREL_ADJUST (fragP);
#endif
}
as_warn_where (fragP->fr_file, fragP->fr_line,
- _(".space, .nop or .fill with negative value, ignored"));
+ _(".space, .nops or .fill with negative value, ignored"));
fragP->fr_symbol = 0;
}
else
#ifdef TC_GENERIC_RELAX_TABLE
/* The default way to relax a frag is to look through
TC_GENERIC_RELAX_TABLE. */
- growth = relax_frag (segment, fragP, stretch);
+ growth = md_generic_table_relax_frag (segment, fragP,
+ stretch);
#endif /* TC_GENERIC_RELAX_TABLE */
#endif
break;
fprintf (stderr, " pcrel");
if (fixp->fx_pcrel_adjust)
fprintf (stderr, " pcrel_adjust=%d", fixp->fx_pcrel_adjust);
- if (fixp->fx_im_disp)
- {
-#ifdef TC_NS32K
- fprintf (stderr, " im_disp=%d", fixp->fx_im_disp);
-#else
- fprintf (stderr, " im_disp");
-#endif
- }
if (fixp->fx_tcbit)
fprintf (stderr, " tcbit");
if (fixp->fx_done)
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