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darling-gdb/gas/config/obj-elf.c
Ken Raeburn e7757ad0bc First cut at handling multiple emulation modes for some MIPS targets. 
Mostly works, not entirely.
Details in ChangeLog.
1995-05-10 23:08:40 +00:00

1181 lines
28 KiB
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/* ELF object file format
Copyright (C) 1992, 1993 Free Software Foundation, Inc.
This file is part of GAS, the GNU Assembler.
GAS is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2,
or (at your option) any later version.
GAS is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
the GNU General Public License for more details.
You should have received a copy of the GNU General Public
License along with GAS; see the file COPYING. If not, write
to the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
#define OBJ_HEADER "obj-elf.h"
#include "as.h"
#include "subsegs.h"
#include "obstack.h"
#ifndef ECOFF_DEBUGGING
#define ECOFF_DEBUGGING 0
#endif
#if ECOFF_DEBUGGING
#include "ecoff.h"
#endif
#ifdef TC_MIPS
#include "elf/mips.h"
#endif
#if ECOFF_DEBUGGING
static boolean elf_get_extr PARAMS ((asymbol *, EXTR *));
static void elf_set_index PARAMS ((asymbol *, bfd_size_type));
#endif
static void obj_elf_line PARAMS ((int));
void obj_elf_version PARAMS ((int));
static void obj_elf_size PARAMS ((int));
static void obj_elf_type PARAMS ((int));
static void obj_elf_ident PARAMS ((int));
static void obj_elf_weak PARAMS ((int));
static void obj_elf_local PARAMS ((int));
static void obj_elf_common PARAMS ((int));
static void obj_elf_data PARAMS ((int));
static void obj_elf_text PARAMS ((int));
static const pseudo_typeS elf_pseudo_table[] =
{
{"comm", obj_elf_common, 0},
{"ident", obj_elf_ident, 0},
{"local", obj_elf_local, 0},
{"previous", obj_elf_previous, 0},
{"section", obj_elf_section, 0},
{"size", obj_elf_size, 0},
{"type", obj_elf_type, 0},
{"version", obj_elf_version, 0},
{"weak", obj_elf_weak, 0},
/* These are used for stabs-in-elf configurations. */
{"line", obj_elf_line, 0},
/* These are used for dwarf. */
{"2byte", cons, 2},
{"4byte", cons, 4},
{"8byte", cons, 8},
/* We need to trap the section changing calls to handle .previous. */
{"data", obj_elf_data, 0},
{"text", obj_elf_text, 0},
/* End sentinel. */
{NULL},
};
static const pseudo_typeS ecoff_debug_pseudo_table[] =
{
/* COFF style debugging information for ECOFF. .ln is not used; .loc
is used instead. */
{ "def", ecoff_directive_def, 0 },
{ "dim", ecoff_directive_dim, 0 },
{ "endef", ecoff_directive_endef, 0 },
{ "file", ecoff_directive_file, 0 },
{ "scl", ecoff_directive_scl, 0 },
{ "tag", ecoff_directive_tag, 0 },
{ "val", ecoff_directive_val, 0 },
/* COFF debugging requires pseudo-ops .size and .type, but ELF
already has meanings for those. We use .esize and .etype
instead. These are only generated by gcc anyhow. */
{ "esize", ecoff_directive_size, 0 },
{ "etype", ecoff_directive_type, 0 },
/* ECOFF specific debugging information. */
{ "begin", ecoff_directive_begin, 0 },
{ "bend", ecoff_directive_bend, 0 },
{ "end", ecoff_directive_end, 0 },
{ "ent", ecoff_directive_ent, 0 },
{ "fmask", ecoff_directive_fmask, 0 },
{ "frame", ecoff_directive_frame, 0 },
{ "loc", ecoff_directive_loc, 0 },
{ "mask", ecoff_directive_mask, 0 },
/* These are used on Irix. I don't know how to implement them. */
{ "alias", s_ignore, 0 },
{ "bgnb", s_ignore, 0 },
{ "endb", s_ignore, 0 },
{ "lab", s_ignore, 0 },
{ "noalias", s_ignore, 0 },
{ "verstamp", s_ignore, 0 },
{ "vreg", s_ignore, 0 },
{NULL} /* end sentinel */
};
#undef NO_RELOC
#include "aout/aout64.h"
void
elf_pop_insert ()
{
pop_insert (elf_pseudo_table);
if (ECOFF_DEBUGGING)
pop_insert (ecoff_debug_pseudo_table);
}
static bfd_vma
elf_s_get_size (sym)
symbolS *sym;
{
return S_GET_SIZE (sym);
}
static void
elf_s_set_size (sym, sz)
symbolS *sym;
bfd_vma sz;
{
S_SET_SIZE (sym, sz);
}
static bfd_vma
elf_s_get_align (sym)
symbolS *sym;
{
return S_GET_ALIGN (sym);
}
static void
elf_s_set_align (sym, align)
symbolS *sym;
bfd_vma align;
{
S_SET_ALIGN (sym, align);
}
static void
elf_copy_symbol_attributes (dest, src)
symbolS *dest, *src;
{
OBJ_COPY_SYMBOL_ATTRIBUTES (dest, src);
}
static int
elf_sec_sym_ok_for_reloc (sec)
asection *sec;
{
return obj_sec_sym_ok_for_reloc (sec);
}
void
elf_file_symbol (s)
char *s;
{
symbolS *sym;
sym = symbol_new (s, absolute_section, (valueT) 0, (struct frag *) 0);
sym->sy_frag = &zero_address_frag;
sym->bsym->flags |= BSF_FILE;
if (symbol_rootP != sym)
{
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);
#endif
}
}
static void
obj_elf_common (ignore)
int ignore;
{
char *name;
char c;
char *p;
int temp, size;
symbolS *symbolP;
int have_align;
name = input_line_pointer;
c = get_symbol_end ();
/* just after name is now '\0' */
p = input_line_pointer;
*p = c;
SKIP_WHITESPACE ();
if (*input_line_pointer != ',')
{
as_bad ("Expected comma after symbol-name");
ignore_rest_of_line ();
return;
}
input_line_pointer++; /* skip ',' */
if ((temp = get_absolute_expression ()) < 0)
{
as_bad (".COMMon length (%d.) <0! Ignored.", temp);
ignore_rest_of_line ();
return;
}
size = temp;
*p = 0;
symbolP = symbol_find_or_make (name);
*p = c;
if (S_IS_DEFINED (symbolP))
{
as_bad ("Ignoring attempt to re-define symbol");
ignore_rest_of_line ();
return;
}
if (S_GET_VALUE (symbolP) != 0)
{
if (S_GET_VALUE (symbolP) != size)
{
as_warn ("Length of .comm \"%s\" is already %ld. Not changed to %d.",
S_GET_NAME (symbolP), (long) S_GET_VALUE (symbolP), size);
}
}
know (symbolP->sy_frag == &zero_address_frag);
if (*input_line_pointer != ',')
have_align = 0;
else
{
have_align = 1;
input_line_pointer++;
SKIP_WHITESPACE ();
}
if (! have_align || *input_line_pointer != '"')
{
if (! have_align)
temp = 0;
else
{
temp = get_absolute_expression ();
if (temp < 0)
{
temp = 0;
as_warn ("Common alignment negative; 0 assumed");
}
}
if (symbolP->local)
{
segT old_sec;
int old_subsec;
char *pfrag;
int align;
/* allocate_bss: */
old_sec = now_seg;
old_subsec = now_subseg;
align = temp;
record_alignment (bss_section, align);
subseg_set (bss_section, 0);
if (align)
frag_align (align, 0);
if (S_GET_SEGMENT (symbolP) == bss_section)
symbolP->sy_frag->fr_symbol = 0;
symbolP->sy_frag = frag_now;
pfrag = frag_var (rs_org, 1, 1, (relax_substateT) 0, symbolP, size,
(char *) 0);
*pfrag = 0;
S_SET_SEGMENT (symbolP, bss_section);
S_CLEAR_EXTERNAL (symbolP);
subseg_set (old_sec, old_subsec);
}
else
{
allocate_common:
S_SET_VALUE (symbolP, (valueT) size);
S_SET_ALIGN (symbolP, temp);
S_SET_EXTERNAL (symbolP);
/* should be common, but this is how gas does it for now */
S_SET_SEGMENT (symbolP, bfd_und_section_ptr);
}
}
else
{
input_line_pointer++;
/* @@ Some use the dot, some don't. Can we get some consistency?? */
if (*input_line_pointer == '.')
input_line_pointer++;
/* @@ Some say data, some say bss. */
if (strncmp (input_line_pointer, "bss\"", 4)
&& strncmp (input_line_pointer, "data\"", 5))
{
while (*--input_line_pointer != '"')
;
input_line_pointer--;
goto bad_common_segment;
}
while (*input_line_pointer++ != '"')
;
goto allocate_common;
}
demand_empty_rest_of_line ();
return;
{
bad_common_segment:
p = input_line_pointer;
while (*p && *p != '\n')
p++;
c = *p;
*p = '\0';
as_bad ("bad .common segment %s", input_line_pointer + 1);
*p = c;
input_line_pointer = p;
ignore_rest_of_line ();
return;
}
}
static void
obj_elf_local (ignore)
int ignore;
{
char *name;
int c;
symbolS *symbolP;
do
{
name = input_line_pointer;
c = get_symbol_end ();
symbolP = symbol_find_or_make (name);
*input_line_pointer = c;
SKIP_WHITESPACE ();
S_CLEAR_EXTERNAL (symbolP);
symbolP->local = 1;
if (c == ',')
{
input_line_pointer++;
SKIP_WHITESPACE ();
if (*input_line_pointer == '\n')
c = '\n';
}
}
while (c == ',');
demand_empty_rest_of_line ();
}
static void
obj_elf_weak (ignore)
int ignore;
{
char *name;
int c;
symbolS *symbolP;
do
{
name = input_line_pointer;
c = get_symbol_end ();
symbolP = symbol_find_or_make (name);
*input_line_pointer = c;
SKIP_WHITESPACE ();
S_SET_WEAK (symbolP);
symbolP->local = 1;
if (c == ',')
{
input_line_pointer++;
SKIP_WHITESPACE ();
if (*input_line_pointer == '\n')
c = '\n';
}
}
while (c == ',');
demand_empty_rest_of_line ();
}
static segT previous_section;
static int previous_subsection;
/* Handle the .section pseudo-op. This code supports two different
syntaxes.
The first is found on Solaris, and looks like
.section ".sec1",#alloc,#execinstr,#write
Here the names after '#' are the SHF_* flags to turn on for the
section. I'm not sure how it determines the SHT_* type (BFD
doesn't really give us control over the type, anyhow).
The second format is found on UnixWare, and probably most SVR4
machines, and looks like
.section .sec1,"a",@progbits
The quoted string may contain any combination of a, w, x, and
represents the SHF_* flags to turn on for the section. The string
beginning with '@' can be progbits or nobits. There should be
other possibilities, but I don't know what they are. In any case,
BFD doesn't really let us set the section type. */
/* Certain named sections have particular defined types, listed on p.
4-19 of the ABI. */
struct special_section
{
const char *name;
int type;
int attributes;
};
static struct special_section special_sections[] =
{
{ ".bss", SHT_NOBITS, SHF_ALLOC + SHF_WRITE },
{ ".comment", SHT_PROGBITS, 0 },
{ ".data", SHT_PROGBITS, SHF_ALLOC + SHF_WRITE },
{ ".data1", SHT_PROGBITS, SHF_ALLOC + SHF_WRITE },
{ ".debug", SHT_PROGBITS, 0 },
{ ".fini", SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR },
{ ".init", SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR },
{ ".line", SHT_PROGBITS, 0 },
{ ".note", SHT_NOTE, 0 },
{ ".rodata", SHT_PROGBITS, SHF_ALLOC },
{ ".rodata1", SHT_PROGBITS, SHF_ALLOC },
{ ".text", SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR },
#ifdef ELF_TC_SPECIAL_SECTIONS
ELF_TC_SPECIAL_SECTIONS
#endif
#if 0
/* The following section names are special, but they can not
reasonably appear in assembler code. Some of the attributes are
processor dependent. */
{ ".dynamic", SHT_DYNAMIC, SHF_ALLOC /* + SHF_WRITE */ },
{ ".dynstr", SHT_STRTAB, SHF_ALLOC },
{ ".dynsym", SHT_DYNSYM, SHF_ALLOC },
{ ".got", SHT_PROGBITS, 0 },
{ ".hash", SHT_HASH, SHF_ALLOC },
{ ".interp", SHT_PROGBITS, /* SHF_ALLOC */ },
{ ".plt", SHT_PROGBITS, 0 },
{ ".shstrtab",SHT_STRTAB, 0 },
{ ".strtab", SHT_STRTAB, /* SHF_ALLOC */ },
{ ".symtab", SHT_SYMTAB, /* SHF_ALLOC */ },
#endif
{ NULL, 0, 0 }
};
void
obj_elf_section (xxx)
int xxx;
{
char *string;
int new_sec;
segT sec;
int type, attr;
int i;
flagword flags;
#ifdef md_flush_pending_output
md_flush_pending_output ();
#endif
/* Get name of section. */
SKIP_WHITESPACE ();
if (*input_line_pointer == '"')
{
string = demand_copy_C_string (&xxx);
if (string == NULL)
{
ignore_rest_of_line ();
return;
}
}
else
{
char *p = input_line_pointer;
char c;
while (0 == strchr ("\n\t,; ", *p))
p++;
if (p == input_line_pointer)
{
as_warn ("Missing section name");
ignore_rest_of_line ();
return;
}
c = *p;
*p = 0;
string = xmalloc ((unsigned long) (p - input_line_pointer + 1));
strcpy (string, input_line_pointer);
*p = c;
input_line_pointer = p;
}
/* Switch to the section, creating it if necessary. */
previous_section = now_seg;
previous_subsection = now_subseg;
new_sec = bfd_get_section_by_name (stdoutput, string) == NULL;
sec = subseg_new (string, 0);
/* If this section already existed, we don't bother to change the
flag values. */
if (! new_sec)
{
while (! is_end_of_line[(unsigned char) *input_line_pointer])
++input_line_pointer;
++input_line_pointer;
#ifdef md_elf_section_change_hook
md_elf_section_change_hook ();
#endif
return;
}
SKIP_WHITESPACE ();
type = SHT_NULL;
attr = 0;
if (*input_line_pointer == ',')
{
/* Skip the comma. */
++input_line_pointer;
SKIP_WHITESPACE ();
if (*input_line_pointer == '"')
{
/* Pick up a string with a combination of a, w, x. */
++input_line_pointer;
while (*input_line_pointer != '"')
{
switch (*input_line_pointer)
{
case 'a':
attr |= SHF_ALLOC;
break;
case 'w':
attr |= SHF_WRITE;
break;
case 'x':
attr |= SHF_EXECINSTR;
break;
default:
as_warn ("Bad .section directive: want a,w,x in string");
ignore_rest_of_line ();
return;
}
++input_line_pointer;
}
/* Skip the closing quote. */
++input_line_pointer;
SKIP_WHITESPACE ();
if (*input_line_pointer == ',')
{
++input_line_pointer;
SKIP_WHITESPACE ();
if (*input_line_pointer == '@')
{
++input_line_pointer;
if (strncmp (input_line_pointer, "progbits",
sizeof "progbits" - 1) == 0)
{
type = SHT_PROGBITS;
input_line_pointer += sizeof "progbits" - 1;
}
else if (strncmp (input_line_pointer, "nobits",
sizeof "nobits" - 1) == 0)
{
type = SHT_NOBITS;
input_line_pointer += sizeof "nobits" - 1;
}
else
{
as_warn ("Unrecognized section type");
ignore_rest_of_line ();
}
}
}
}
else
{
do
{
SKIP_WHITESPACE ();
if (*input_line_pointer != '#')
{
as_warn ("Bad .section directive");
ignore_rest_of_line ();
return;
}
++input_line_pointer;
if (strncmp (input_line_pointer, "write",
sizeof "write" - 1) == 0)
{
attr |= SHF_WRITE;
input_line_pointer += sizeof "write" - 1;
}
else if (strncmp (input_line_pointer, "alloc",
sizeof "alloc" - 1) == 0)
{
attr |= SHF_ALLOC;
input_line_pointer += sizeof "alloc" - 1;
}
else if (strncmp (input_line_pointer, "execinstr",
sizeof "execinstr" - 1) == 0)
{
attr |= SHF_EXECINSTR;
input_line_pointer += sizeof "execinstr" - 1;
}
else
{
as_warn ("Unrecognized section attribute");
ignore_rest_of_line ();
return;
}
SKIP_WHITESPACE ();
}
while (*input_line_pointer++ == ',');
--input_line_pointer;
}
}
/* See if this is one of the special sections. */
for (i = 0; special_sections[i].name != NULL; i++)
{
if (string[1] == special_sections[i].name[1]
&& strcmp (string, special_sections[i].name) == 0)
{
if (type == SHT_NULL)
type = special_sections[i].type;
else if (type != special_sections[i].type)
as_warn ("Setting incorrect section type for %s", string);
if ((attr &~ special_sections[i].attributes) != 0)
as_warn ("Setting incorrect section attributes for %s", string);
attr |= special_sections[i].attributes;
break;
}
}
flags = (SEC_RELOC
| ((attr & SHF_WRITE) ? 0 : SEC_READONLY)
| ((attr & SHF_ALLOC) ? SEC_ALLOC | SEC_LOAD : 0)
| ((attr & SHF_EXECINSTR) ? SEC_CODE : 0));
if (special_sections[i].name == NULL)
{
if (type == SHT_PROGBITS)
flags |= SEC_ALLOC | SEC_LOAD;
else if (type == SHT_NOBITS)
{
flags |= SEC_ALLOC;
flags &=~ SEC_LOAD;
}
}
bfd_set_section_flags (stdoutput, sec, flags);
#ifdef md_elf_section_change_hook
md_elf_section_change_hook ();
#endif
demand_empty_rest_of_line ();
}
/* Change to the .data section. */
static void
obj_elf_data (i)
int i;
{
previous_section = now_seg;
previous_subsection = now_subseg;
s_data (i);
}
/* Change to the .text section. */
static void
obj_elf_text (i)
int i;
{
previous_section = now_seg;
previous_subsection = now_subseg;
s_text (i);
}
void
obj_elf_previous (ignore)
int ignore;
{
if (previous_section == 0)
{
as_bad (".previous without corresponding .section; ignored");
return;
}
subseg_set (previous_section, previous_subsection);
previous_section = 0;
}
static void
obj_elf_line (ignore)
int ignore;
{
/* Assume delimiter is part of expression. BSD4.2 as fails with
delightful bug, so we are not being incompatible here. */
new_logical_line ((char *) NULL, (int) (get_absolute_expression ()));
demand_empty_rest_of_line ();
}
void
obj_read_begin_hook ()
{
if (ECOFF_DEBUGGING)
ecoff_read_begin_hook ();
}
void
obj_symbol_new_hook (symbolP)
symbolS *symbolP;
{
symbolP->sy_obj = 0;
if (ECOFF_DEBUGGING)
ecoff_symbol_new_hook (symbolP);
}
void
obj_elf_version (ignore)
int ignore;
{
char *name;
unsigned int c;
char ch;
char *p;
asection *seg = now_seg;
subsegT subseg = now_subseg;
Elf_Internal_Note i_note;
Elf_External_Note e_note;
asection *note_secp = (asection *) NULL;
int i, len;
SKIP_WHITESPACE ();
if (*input_line_pointer == '\"')
{
++input_line_pointer; /* -> 1st char of string. */
name = input_line_pointer;
while (is_a_char (c = next_char_of_string ()))
;
c = *input_line_pointer;
*input_line_pointer = '\0';
*(input_line_pointer - 1) = '\0';
*input_line_pointer = c;
/* create the .note section */
note_secp = subseg_new (".note", 0);
bfd_set_section_flags (stdoutput,
note_secp,
SEC_HAS_CONTENTS | SEC_READONLY);
/* process the version string */
len = strlen (name);
i_note.namesz = ((len + 1) + 3) & ~3; /* round this to word boundary */
i_note.descsz = 0; /* no description */
i_note.type = NT_VERSION;
p = frag_more (sizeof (e_note.namesz));
md_number_to_chars (p, (valueT) i_note.namesz, 4);
p = frag_more (sizeof (e_note.descsz));
md_number_to_chars (p, (valueT) i_note.descsz, 4);
p = frag_more (sizeof (e_note.type));
md_number_to_chars (p, (valueT) i_note.type, 4);
for (i = 0; i < len; i++)
{
ch = *(name + i);
{
FRAG_APPEND_1_CHAR (ch);
}
}
frag_align (2, 0);
subseg_set (seg, subseg);
}
else
{
as_bad ("Expected quoted string");
}
demand_empty_rest_of_line ();
}
static void
obj_elf_size (ignore)
int ignore;
{
char *name = input_line_pointer;
char c = get_symbol_end ();
char *p;
expressionS exp;
symbolS *sym;
p = input_line_pointer;
*p = c;
SKIP_WHITESPACE ();
if (*input_line_pointer != ',')
{
*p = 0;
as_bad ("expected comma after name `%s' in .size directive", name);
*p = c;
ignore_rest_of_line ();
return;
}
input_line_pointer++;
expression (&exp);
if (exp.X_op == O_absent)
{
as_bad ("missing expression in .size directive");
exp.X_op = O_constant;
exp.X_add_number = 0;
}
*p = 0;
sym = symbol_find_or_make (name);
*p = c;
if (exp.X_op == O_constant)
S_SET_SIZE (sym, exp.X_add_number);
else
{
sym->sy_obj = (expressionS *) xmalloc (sizeof (expressionS));
*sym->sy_obj = exp;
}
demand_empty_rest_of_line ();
}
/* Handle the ELF .type pseudo-op. This sets the type of a symbol.
There are three syntaxes. The first (used on Solaris) is
.type SYM,#function
The second (used on UnixWare) is
.type SYM,@function
The third (reportedly to be used on Irix 6.0) is
.type SYM STT_FUNC
FIXME: We do not fully support this pseudo-op. In fact, the only
case we do support is setting the type to STT_FUNC, which we do by
setting the BSF_FUNCTION flag. */
static void
obj_elf_type (ignore)
int ignore;
{
char *name;
char c;
int type;
const char *typename;
symbolS *sym;
name = input_line_pointer;
c = get_symbol_end ();
sym = symbol_find_or_make (name);
*input_line_pointer = c;
SKIP_WHITESPACE ();
if (*input_line_pointer == ',')
++input_line_pointer;
SKIP_WHITESPACE ();
if (*input_line_pointer == '#' || *input_line_pointer == '@')
++input_line_pointer;
typename = input_line_pointer;
c = get_symbol_end ();
type = 0;
if (strcmp (typename, "function") == 0
|| strcmp (typename, "STT_FUNC") == 0)
type = BSF_FUNCTION;
else if (strcmp (typename, "object") == 0
|| strcmp (typename, "STT_OBJECT") == 0)
;
else
as_bad ("ignoring unrecognized symbol type \"%s\"", typename);
*input_line_pointer = c;
sym->bsym->flags |= type;
demand_empty_rest_of_line ();
}
static void
obj_elf_ident (ignore)
int ignore;
{
static segT comment_section;
segT old_section = now_seg;
int old_subsection = now_subseg;
if (!comment_section)
{
char *p;
comment_section = subseg_new (".comment", 0);
bfd_set_section_flags (stdoutput, comment_section,
SEC_READONLY | SEC_HAS_CONTENTS);
p = frag_more (1);
*p = 0;
}
else
subseg_set (comment_section, 0);
stringer (1);
subseg_set (old_section, old_subsection);
}
#ifdef INIT_STAB_SECTION
/* The first entry in a .stabs section is special. */
void
obj_elf_init_stab_section (seg)
segT seg;
{
char *file;
char *p;
char *stabstr_name;
unsigned int stroff;
/* Force the section to align to a longword boundary. Without this,
UnixWare ar crashes. */
bfd_set_section_alignment (stdoutput, seg, 2);
/* Make space for this first symbol. */
p = frag_more (12);
/* Zero it out. */
memset (p, 0, 12);
as_where (&file, (unsigned int *) NULL);
stabstr_name = (char *) alloca (strlen (segment_name (seg)) + 4);
strcpy (stabstr_name, segment_name (seg));
strcat (stabstr_name, "str");
stroff = get_stab_string_offset (file, stabstr_name);
know (stroff == 1);
md_number_to_chars (p, stroff, 4);
seg_info (seg)->stabu.p = p;
}
#endif
/* Fill in the counts in the first entry in a .stabs section. */
static void
adjust_stab_sections (abfd, sec, xxx)
bfd *abfd;
asection *sec;
PTR xxx;
{
char *name;
asection *strsec;
char *p;
int strsz, nsyms;
if (strncmp (".stab", sec->name, 5))
return;
if (!strcmp ("str", sec->name + strlen (sec->name) - 3))
return;
name = (char *) alloca (strlen (sec->name) + 4);
strcpy (name, sec->name);
strcat (name, "str");
strsec = bfd_get_section_by_name (abfd, name);
if (strsec)
strsz = bfd_section_size (abfd, strsec);
else
strsz = 0;
nsyms = bfd_section_size (abfd, sec) / 12 - 1;
p = seg_info (sec)->stabu.p;
assert (p != 0);
bfd_h_put_16 (abfd, (bfd_vma) nsyms, (bfd_byte *) p + 6);
bfd_h_put_32 (abfd, (bfd_vma) strsz, (bfd_byte *) p + 8);
}
/* #ifdef ECOFF_DEBUGGING */
/* This function is called by the ECOFF code. It is supposed to
record the external symbol information so that the backend can
write it out correctly. The ELF backend doesn't actually handle
this at the moment, so we do it ourselves. We save the information
in the symbol. */
void
elf_ecoff_set_ext (sym, ext)
symbolS *sym;
struct ecoff_extr *ext;
{
sym->bsym->udata.p = (PTR) ext;
}
/* This function is called by bfd_ecoff_debug_externals. It is
supposed to *EXT to the external symbol information, and return
whether the symbol should be used at all. */
static boolean
elf_get_extr (sym, ext)
asymbol *sym;
EXTR *ext;
{
if (sym->udata.p == NULL)
return false;
*ext = *(EXTR *) sym->udata.p;
return true;
}
/* This function is called by bfd_ecoff_debug_externals. It has
nothing to do for ELF. */
/*ARGSUSED*/
static void
elf_set_index (sym, indx)
asymbol *sym;
bfd_size_type indx;
{
}
/* #endif /* ECOFF_DEBUGGING */
void
elf_frob_symbol (symp, puntp)
symbolS *symp;
int *puntp;
{
if (ECOFF_DEBUGGING)
ecoff_frob_symbol (symp);
if (symp->sy_obj)
{
switch (symp->sy_obj->X_op)
{
case O_subtract:
S_SET_SIZE (symp,
(S_GET_VALUE (symp->sy_obj->X_add_symbol)
+ symp->sy_obj->X_add_number
- S_GET_VALUE (symp->sy_obj->X_op_symbol)));
break;
case O_constant:
S_SET_SIZE (symp,
(S_GET_VALUE (symp->sy_obj->X_add_symbol)
+ symp->sy_obj->X_add_number));
break;
default:
as_bad (".size expression too complicated to fix up");
break;
}
}
free (symp->sy_obj);
symp->sy_obj = 0;
/* Double check weak symbols. */
if (symp->bsym->flags & BSF_WEAK)
{
if (S_IS_COMMON (symp))
as_bad ("Symbol `%s' can not be both weak and common",
S_GET_NAME (symp));
}
}
void
elf_frob_file ()
{
bfd_map_over_sections (stdoutput, adjust_stab_sections, (PTR) 0);
#ifdef elf_tc_final_processing
elf_tc_final_processing ();
#endif
if (ECOFF_DEBUGGING)
/* Generate the ECOFF debugging information. */
{
const struct ecoff_debug_swap *debug_swap;
struct ecoff_debug_info debug;
char *buf;
asection *sec;
debug_swap
= get_elf_backend_data (stdoutput)->elf_backend_ecoff_debug_swap;
know (debug_swap != (const struct ecoff_debug_swap *) NULL);
ecoff_build_debug (&debug.symbolic_header, &buf, debug_swap);
/* Set up the pointers in debug. */
#define SET(ptr, offset, type) \
debug.ptr = (type) (buf + debug.symbolic_header.offset)
SET (line, cbLineOffset, unsigned char *);
SET (external_dnr, cbDnOffset, PTR);
SET (external_pdr, cbPdOffset, PTR);
SET (external_sym, cbSymOffset, PTR);
SET (external_opt, cbOptOffset, PTR);
SET (external_aux, cbAuxOffset, union aux_ext *);
SET (ss, cbSsOffset, char *);
SET (external_fdr, cbFdOffset, PTR);
SET (external_rfd, cbRfdOffset, PTR);
/* ssext and external_ext are set up just below. */
#undef SET
/* Set up the external symbols. */
debug.ssext = debug.ssext_end = NULL;
debug.external_ext = debug.external_ext_end = NULL;
if (! bfd_ecoff_debug_externals (stdoutput, &debug, debug_swap, true,
elf_get_extr, elf_set_index))
as_fatal ("Failed to set up debugging information: %s",
bfd_errmsg (bfd_get_error ()));
sec = bfd_get_section_by_name (stdoutput, ".mdebug");
assert (sec != NULL);
know (stdoutput->output_has_begun == false);
/* We set the size of the section, call bfd_set_section_contents
to force the ELF backend to allocate a file position, and then
write out the data. FIXME: Is this really the best way to do
this? */
sec->_raw_size = bfd_ecoff_debug_size (stdoutput, &debug, debug_swap);
if (! bfd_set_section_contents (stdoutput, sec, (PTR) NULL,
(file_ptr) 0, (bfd_size_type) 0))
as_fatal ("Can't start writing .mdebug section: %s",
bfd_errmsg (bfd_get_error ()));
know (stdoutput->output_has_begun == true);
know (sec->filepos != 0);
if (! bfd_ecoff_write_debug (stdoutput, &debug, debug_swap,
sec->filepos))
as_fatal ("Could not write .mdebug section: %s",
bfd_errmsg (bfd_get_error ()));
}
}
const struct format_ops elf_format_ops =
{
bfd_target_elf_flavour,
0,
1,
elf_frob_symbol,
elf_frob_file,
elf_s_get_size, elf_s_set_size,
elf_s_get_align, elf_s_set_align,
elf_copy_symbol_attributes,
#ifdef ECOFF_DEBUGGING
ecoff_generate_asm_lineno,
#else
0,
#endif
0, /* process_stab */
elf_sec_sym_ok_for_reloc,
elf_pop_insert,
elf_ecoff_set_ext,
obj_read_begin_hook,
obj_symbol_new_hook,
};
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