/* write.c - emit .o file
- Copyright 1986, 1987, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
- 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
- Free Software Foundation, Inc.
+ Copyright (C) 1986-2015 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)
+ the Free Software Foundation; either version 3, or (at your option)
any later version.
GAS is distributed in the hope that it will be useful,
#include "output-file.h"
#include "dwarf2dbg.h"
#include "libbfd.h"
-
-#ifndef TC_ADJUST_RELOC_COUNT
-#define TC_ADJUST_RELOC_COUNT(FIX, COUNT)
-#endif
+#include "compress-debug.h"
#ifndef TC_FORCE_RELOCATION
#define TC_FORCE_RELOCATION(FIX) \
(! SEG_NORMAL (SEG))
#endif
+#ifndef md_register_arithmetic
+# define md_register_arithmetic 1
+#endif
+
#ifndef TC_FORCE_RELOCATION_SUB_ABS
-#define TC_FORCE_RELOCATION_SUB_ABS(FIX) 0
+#define TC_FORCE_RELOCATION_SUB_ABS(FIX, SEG) \
+ (!md_register_arithmetic && (SEG) == reg_section)
#endif
#ifndef TC_FORCE_RELOCATION_SUB_LOCAL
#ifdef DIFF_EXPR_OK
-#define TC_FORCE_RELOCATION_SUB_LOCAL(FIX) 0
+#define TC_FORCE_RELOCATION_SUB_LOCAL(FIX, SEG) \
+ (!md_register_arithmetic && (SEG) == reg_section)
#else
-#define TC_FORCE_RELOCATION_SUB_LOCAL(FIX) 1
+#define TC_FORCE_RELOCATION_SUB_LOCAL(FIX, SEG) 1
#endif
#endif
#ifndef TC_VALIDATE_FIX_SUB
#ifdef UNDEFINED_DIFFERENCE_OK
/* The PA needs this for PIC code generation. */
-#define TC_VALIDATE_FIX_SUB(FIX) 1
+#define TC_VALIDATE_FIX_SUB(FIX, SEG) \
+ (md_register_arithmetic || (SEG) != reg_section)
#else
-#define TC_VALIDATE_FIX_SUB(FIX) \
- ((FIX)->fx_r_type == BFD_RELOC_GPREL32 \
- || (FIX)->fx_r_type == BFD_RELOC_GPREL16)
+#define TC_VALIDATE_FIX_SUB(FIX, SEG) \
+ ((md_register_arithmetic || (SEG) != reg_section) \
+ && ((FIX)->fx_r_type == BFD_RELOC_GPREL32 \
+ || (FIX)->fx_r_type == BFD_RELOC_GPREL16))
#endif
#endif
#define TC_FAKE_LABEL(NAME) (strcmp ((NAME), FAKE_LABEL_NAME) == 0)
#endif
+/* Positive values of TC_FX_SIZE_SLACK allow a target to define
+ fixups that far past the end of a frag. Having such fixups
+ is of course most most likely a bug in setting fx_size correctly.
+ A negative value disables the fixup check entirely, which is
+ appropriate for something like the Renesas / SuperH SH_COUNT
+ reloc. */
+#ifndef TC_FX_SIZE_SLACK
+#define TC_FX_SIZE_SLACK(FIX) 0
+#endif
+
/* Used to control final evaluation of expressions. */
int finalize_syms = 0;
/* Remember the value of dot when parsing expressions. */
addressT dot_value;
+/* The frag that dot_value is based from. */
+fragS *dot_frag;
+
+/* Relocs generated by ".reloc" pseudo. */
+struct reloc_list* reloc_list;
+
void print_fixup (fixS *);
/* We generally attach relocs to frag chains. However, after we have
symbolS *sub_symbol, /* X_op_symbol. */
offsetT offset, /* X_add_number. */
int pcrel, /* TRUE if PC-relative relocation. */
- RELOC_ENUM r_type ATTRIBUTE_UNUSED /* Relocation type. */)
+ RELOC_ENUM r_type /* Relocation type. */,
+ int at_beginning) /* Add to the start of the list? */
{
fixS *fixP;
n_fixups++;
- fixP = obstack_alloc (¬es, sizeof (fixS));
+ fixP = (fixS *) obstack_alloc (¬es, sizeof (fixS));
fixP->fx_frag = frag;
fixP->fx_where = where;
fixP->fx_subsy = sub_symbol;
fixP->fx_offset = offset;
fixP->fx_dot_value = dot_value;
+ fixP->fx_dot_frag = dot_frag;
fixP->fx_pcrel = pcrel;
fixP->fx_r_type = r_type;
fixP->fx_im_disp = 0;
as_where (&fixP->fx_file, &fixP->fx_line);
- /* Usually, we want relocs sorted numerically, but while
- comparing to older versions of gas that have relocs
- reverse sorted, it is convenient to have this compile
- time option. xoxorich. */
{
fixS **seg_fix_rootP = (frags_chained
? &seg_info (now_seg)->fix_tail
: &frchain_now->fix_tail);
-#ifdef REVERSE_SORT_RELOCS
-
- fixP->fx_next = *seg_fix_rootP;
- *seg_fix_rootP = fixP;
-
-#else /* REVERSE_SORT_RELOCS */
-
- fixP->fx_next = NULL;
-
- if (*seg_fix_tailP)
- (*seg_fix_tailP)->fx_next = fixP;
+ if (at_beginning)
+ {
+ fixP->fx_next = *seg_fix_rootP;
+ *seg_fix_rootP = fixP;
+ if (fixP->fx_next == NULL)
+ *seg_fix_tailP = fixP;
+ }
else
- *seg_fix_rootP = fixP;
- *seg_fix_tailP = fixP;
-
-#endif /* REVERSE_SORT_RELOCS */
+ {
+ fixP->fx_next = NULL;
+ if (*seg_fix_tailP)
+ (*seg_fix_tailP)->fx_next = fixP;
+ else
+ *seg_fix_rootP = fixP;
+ *seg_fix_tailP = fixP;
+ }
}
return fixP;
RELOC_ENUM r_type /* Relocation type. */)
{
return fix_new_internal (frag, where, size, add_symbol,
- (symbolS *) NULL, offset, pcrel, r_type);
+ (symbolS *) NULL, offset, pcrel, r_type, FALSE);
}
/* Create a fixup for an expression. Currently we only support fixups
break;
}
- return fix_new_internal (frag, where, size, add, sub, off, pcrel, r_type);
+ return fix_new_internal (frag, where, size, add, sub, off, pcrel,
+ r_type, FALSE);
+}
+
+/* Create a fixup at the beginning of FRAG. The arguments are the same
+ as for fix_new, except that WHERE is implicitly 0. */
+
+fixS *
+fix_at_start (fragS *frag, int size, symbolS *add_symbol,
+ offsetT offset, int pcrel, RELOC_ENUM r_type)
+{
+ return fix_new_internal (frag, 0, size, add_symbol,
+ (symbolS *) NULL, offset, pcrel, r_type, TRUE);
}
/* Generic function to determine whether a fixup requires a relocation. */
{
prev_frag->fr_next = frchp->frch_root;
prev_frag = frchp->frch_last;
- assert (prev_frag->fr_type != 0);
+ gas_assert (prev_frag->fr_type != 0);
if (frchp->fix_root != (fixS *) NULL)
{
if (seg_info (section)->fix_root == (fixS *) NULL)
prev_fix = frchp->fix_tail;
}
}
- assert (prev_frag->fr_type != 0);
- assert (prev_frag != &dummy);
+ gas_assert (prev_frag != &dummy
+ && prev_frag->fr_type != 0);
prev_frag->fr_next = 0;
return prev_frag;
}
case rs_machine_dependent:
md_convert_frag (stdoutput, sec, fragP);
- assert (fragP->fr_next == NULL
+ gas_assert (fragP->fr_next == NULL
|| ((offsetT) (fragP->fr_next->fr_address - fragP->fr_address)
== fragP->fr_fix));
size = 0;
flags = bfd_get_section_flags (abfd, sec);
+ if (size == 0 && bfd_get_section_size (sec) != 0 &&
+ (flags & SEC_HAS_CONTENTS) != 0)
+ return;
if (size > 0 && ! seginfo->bss)
flags |= SEC_HAS_CONTENTS;
- /* @@ This is just an approximation. */
- if (seginfo && seginfo->fix_root)
- flags |= SEC_RELOC;
- else
- flags &= ~SEC_RELOC;
+ flags &= ~SEC_RELOC;
x = bfd_set_section_flags (abfd, sec, flags);
- assert (x);
+ gas_assert (x);
newsize = md_section_align (sec, size);
x = bfd_set_section_size (abfd, sec, newsize);
- assert (x);
+ gas_assert (x);
/* If the size had to be rounded up, add some padding in the last
non-empty frag. */
- assert (newsize >= size);
+ gas_assert (newsize >= size);
if (size != newsize)
{
fragS *last = seginfo->frchainP->frch_last;
#define EMIT_SECTION_SYMBOLS 1
#endif
+/* Resolve U.A.OFFSET_SYM and U.A.SYM fields of RELOC_LIST entries,
+ and check for validity. Convert RELOC_LIST from using U.A fields
+ to U.B fields. */
+static void
+resolve_reloc_expr_symbols (void)
+{
+ bfd_vma addr_mask = 1;
+ struct reloc_list *r;
+
+ /* Avoid a shift by the width of type. */
+ addr_mask <<= bfd_arch_bits_per_address (stdoutput) - 1;
+ addr_mask <<= 1;
+ addr_mask -= 1;
+
+ for (r = reloc_list; r; r = r->next)
+ {
+ reloc_howto_type *howto = r->u.a.howto;
+ expressionS *symval;
+ symbolS *sym;
+ bfd_vma offset, addend;
+ asection *sec;
+
+ resolve_symbol_value (r->u.a.offset_sym);
+ symval = symbol_get_value_expression (r->u.a.offset_sym);
+
+ offset = 0;
+ sym = NULL;
+ if (symval->X_op == O_constant)
+ sym = r->u.a.offset_sym;
+ else if (symval->X_op == O_symbol)
+ {
+ sym = symval->X_add_symbol;
+ offset = symval->X_add_number;
+ symval = symbol_get_value_expression (symval->X_add_symbol);
+ }
+ if (sym == NULL
+ || symval->X_op != O_constant
+ || (sec = S_GET_SEGMENT (sym)) == NULL
+ || !SEG_NORMAL (sec))
+ {
+ as_bad_where (r->file, r->line, _("invalid offset expression"));
+ sec = NULL;
+ }
+ else
+ offset += S_GET_VALUE (sym);
+
+ sym = NULL;
+ addend = r->u.a.addend;
+ if (r->u.a.sym != NULL)
+ {
+ resolve_symbol_value (r->u.a.sym);
+ symval = symbol_get_value_expression (r->u.a.sym);
+ if (symval->X_op == O_constant)
+ sym = r->u.a.sym;
+ else if (symval->X_op == O_symbol)
+ {
+ sym = symval->X_add_symbol;
+ addend += symval->X_add_number;
+ symval = symbol_get_value_expression (symval->X_add_symbol);
+ }
+ if (symval->X_op != O_constant)
+ {
+ as_bad_where (r->file, r->line, _("invalid reloc expression"));
+ sec = NULL;
+ }
+ else if (sym != NULL)
+ {
+ /* Convert relocs against local symbols to refer to the
+ corresponding section symbol plus offset instead. Keep
+ PC-relative relocs of the REL variety intact though to
+ prevent the offset from overflowing the relocated field,
+ unless it has enough bits to cover the whole address
+ space. */
+ if (S_IS_LOCAL (sym) && !symbol_section_p (sym)
+ && (sec->use_rela_p
+ || (howto->partial_inplace
+ && (!howto->pc_relative
+ || howto->src_mask == addr_mask))))
+ {
+ asection *symsec = S_GET_SEGMENT (sym);
+ if (!(((symsec->flags & SEC_MERGE) != 0
+ && addend != 0)
+ || (symsec->flags & SEC_THREAD_LOCAL) != 0))
+ {
+ addend += S_GET_VALUE (sym);
+ sym = section_symbol (symsec);
+ }
+ }
+ symbol_mark_used_in_reloc (sym);
+ }
+ }
+ if (sym == NULL)
+ {
+ if (abs_section_sym == NULL)
+ abs_section_sym = section_symbol (absolute_section);
+ sym = abs_section_sym;
+ }
+
+ r->u.b.sec = sec;
+ r->u.b.s = symbol_get_bfdsym (sym);
+ r->u.b.r.sym_ptr_ptr = &r->u.b.s;
+ r->u.b.r.address = offset;
+ r->u.b.r.addend = addend;
+ r->u.b.r.howto = howto;
+ }
+}
+
/* This pass over fixups decides whether symbols can be replaced with
section symbols. */
if (symsec == NULL)
abort ();
- if (bfd_is_abs_section (symsec))
+ if (bfd_is_abs_section (symsec)
+ || symsec == reg_section)
{
/* The fixup_segment routine normally will not use this
symbol in a relocation. */
handled now. (These consist of fixS where we have since discovered
the value of a symbol, or the address of the frag involved.)
For each one, call md_apply_fix to put the fix into the frag data.
+ Ones that we couldn't completely handle here will be output later
+ by emit_relocations. */
- Result is a count of how many relocation structs will be needed to
- handle the remaining fixS's that we couldn't completely handle here.
- These will be output later by emit_relocations(). */
-
-static long
+static void
fixup_segment (fixS *fixP, segT this_segment)
{
- long seg_reloc_count = 0;
valueT add_number;
fragS *fragP;
segT add_symbol_segment = absolute_section;
symbol_mark_used_in_reloc (fixP->fx_addsy);
if (fixP->fx_subsy != NULL)
symbol_mark_used_in_reloc (fixP->fx_subsy);
- seg_reloc_count++;
}
- TC_ADJUST_RELOC_COUNT (fixP, seg_reloc_count);
- return seg_reloc_count;
+ return;
}
for (; fixP; fixP = fixP->fx_next)
sub_symbol_segment = S_GET_SEGMENT (fixP->fx_subsy);
if (fixP->fx_addsy != NULL
&& sub_symbol_segment == add_symbol_segment
+ && !S_FORCE_RELOC (fixP->fx_addsy, 0)
+ && !S_FORCE_RELOC (fixP->fx_subsy, 0)
&& !TC_FORCE_RELOCATION_SUB_SAME (fixP, add_symbol_segment))
{
add_number += S_GET_VALUE (fixP->fx_addsy);
#endif
}
else if (sub_symbol_segment == absolute_section
- && !TC_FORCE_RELOCATION_SUB_ABS (fixP))
+ && !S_FORCE_RELOC (fixP->fx_subsy, 0)
+ && !TC_FORCE_RELOCATION_SUB_ABS (fixP, add_symbol_segment))
{
add_number -= S_GET_VALUE (fixP->fx_subsy);
fixP->fx_offset = add_number;
fixP->fx_subsy = NULL;
}
else if (sub_symbol_segment == this_segment
- && !TC_FORCE_RELOCATION_SUB_LOCAL (fixP))
+ && !S_FORCE_RELOC (fixP->fx_subsy, 0)
+ && !TC_FORCE_RELOCATION_SUB_LOCAL (fixP, add_symbol_segment))
{
add_number -= S_GET_VALUE (fixP->fx_subsy);
fixP->fx_offset = (add_number + fixP->fx_dot_value
- + fixP->fx_frag->fr_address);
+ + fixP->fx_dot_frag->fr_address);
/* Make it pc-relative. If the back-end code has not
selected a pc-relative reloc, cancel the adjustment
fixP->fx_subsy = NULL;
fixP->fx_pcrel = 1;
}
- else if (!TC_VALIDATE_FIX_SUB (fixP))
+ else if (!TC_VALIDATE_FIX_SUB (fixP, add_symbol_segment))
{
- as_bad_where (fixP->fx_file, fixP->fx_line,
- _("can't resolve `%s' {%s section} - `%s' {%s section}"),
- fixP->fx_addsy ? S_GET_NAME (fixP->fx_addsy) : "0",
- segment_name (add_symbol_segment),
- S_GET_NAME (fixP->fx_subsy),
- segment_name (sub_symbol_segment));
+ if (!md_register_arithmetic
+ && (add_symbol_segment == reg_section
+ || sub_symbol_segment == reg_section))
+ as_bad_where (fixP->fx_file, fixP->fx_line,
+ _("register value used as expression"));
+ else
+ as_bad_where (fixP->fx_file, fixP->fx_line,
+ _("can't resolve `%s' {%s section} - `%s' {%s section}"),
+ fixP->fx_addsy ? S_GET_NAME (fixP->fx_addsy) : "0",
+ segment_name (add_symbol_segment),
+ S_GET_NAME (fixP->fx_subsy),
+ segment_name (sub_symbol_segment));
}
+ else if (sub_symbol_segment != undefined_section
+ && ! bfd_is_com_section (sub_symbol_segment)
+ && MD_APPLY_SYM_VALUE (fixP))
+ add_number -= S_GET_VALUE (fixP->fx_subsy);
}
if (fixP->fx_addsy)
{
if (add_symbol_segment == this_segment
+ && !S_FORCE_RELOC (fixP->fx_addsy, 0)
&& !TC_FORCE_RELOCATION_LOCAL (fixP))
{
/* This fixup was made when the symbol's segment was
fixP->fx_pcrel = 0;
}
else if (add_symbol_segment == absolute_section
+ && !S_FORCE_RELOC (fixP->fx_addsy, 0)
&& !TC_FORCE_RELOCATION_ABS (fixP))
{
add_number += S_GET_VALUE (fixP->fx_addsy);
if (!fixP->fx_done)
{
- ++seg_reloc_count;
if (fixP->fx_addsy == NULL)
fixP->fx_addsy = abs_section_sym;
symbol_mark_used_in_reloc (fixP->fx_addsy);
print_fixup (fixP);
#endif
} /* For each fixS in this segment. */
-
- TC_ADJUST_RELOC_COUNT (fixP, seg_reloc_count);
- return seg_reloc_count;
}
static void
fixup_segment (seginfo->fix_root, sec);
}
+static void
+install_reloc (asection *sec, arelent *reloc, fragS *fragp,
+ char *file, unsigned int line)
+{
+ char *err;
+ bfd_reloc_status_type s;
+ asymbol *sym;
+
+ if (reloc->sym_ptr_ptr != NULL
+ && (sym = *reloc->sym_ptr_ptr) != NULL
+ && (sym->flags & BSF_KEEP) == 0
+ && ((sym->flags & BSF_SECTION_SYM) == 0
+ || (EMIT_SECTION_SYMBOLS
+ && !bfd_is_abs_section (sym->section))))
+ as_bad_where (file, line, _("redefined symbol cannot be used on reloc"));
+
+ s = bfd_install_relocation (stdoutput, reloc,
+ fragp->fr_literal, fragp->fr_address,
+ sec, &err);
+ switch (s)
+ {
+ case bfd_reloc_ok:
+ break;
+ case bfd_reloc_overflow:
+ as_bad_where (file, line, _("relocation overflow"));
+ break;
+ case bfd_reloc_outofrange:
+ as_bad_where (file, line, _("relocation out of range"));
+ break;
+ default:
+ as_fatal (_("%s:%u: bad return from bfd_install_relocation: %x"),
+ file, line, s);
+ }
+}
+
+static fragS *
+get_frag_for_reloc (fragS *last_frag,
+ const segment_info_type *seginfo,
+ const struct reloc_list *r)
+{
+ fragS *f;
+
+ for (f = last_frag; f != NULL; f = f->fr_next)
+ if (f->fr_address <= r->u.b.r.address
+ && r->u.b.r.address < f->fr_address + f->fr_fix)
+ return f;
+
+ for (f = seginfo->frchainP->frch_root; f != NULL; f = f->fr_next)
+ if (f->fr_address <= r->u.b.r.address
+ && r->u.b.r.address < f->fr_address + f->fr_fix)
+ return f;
+
+ for (f = seginfo->frchainP->frch_root; f != NULL; f = f->fr_next)
+ if (f->fr_address <= r->u.b.r.address
+ && r->u.b.r.address <= f->fr_address + f->fr_fix)
+ return f;
+
+ as_bad_where (r->file, r->line,
+ _("reloc not within (fixed part of) section"));
+ return NULL;
+}
+
static void
write_relocs (bfd *abfd, asection *sec, void *xxx ATTRIBUTE_UNUSED)
{
segment_info_type *seginfo = seg_info (sec);
- unsigned int i;
unsigned int n;
+ struct reloc_list *my_reloc_list, **rp, *r;
arelent **relocs;
fixS *fixp;
- char *err;
+ fragS *last_frag;
/* If seginfo is NULL, we did not create this section; don't do
anything with it. */
n = 0;
for (fixp = seginfo->fix_root; fixp; fixp = fixp->fx_next)
- n++;
+ if (!fixp->fx_done)
+ n++;
-#ifndef RELOC_EXPANSION_POSSIBLE
- /* Set up reloc information as well. */
- relocs = xcalloc (n, sizeof (arelent *));
+#ifdef RELOC_EXPANSION_POSSIBLE
+ n *= MAX_RELOC_EXPANSION;
+#endif
- i = 0;
- for (fixp = seginfo->fix_root; fixp != (fixS *) NULL; fixp = fixp->fx_next)
+ /* Extract relocs for this section from reloc_list. */
+ rp = &reloc_list;
+ my_reloc_list = NULL;
+ while ((r = *rp) != NULL)
{
- arelent *reloc;
- bfd_reloc_status_type s;
-
- if (fixp->fx_done)
+ if (r->u.b.sec == sec)
{
- n--;
- continue;
- }
-
- reloc = tc_gen_reloc (sec, fixp);
- if (!reloc)
- {
- n--;
- continue;
+ *rp = r->next;
+ r->next = my_reloc_list;
+ my_reloc_list = r;
+ n++;
}
-
- /*
- This test is triggered inappropriately for the SH:
- if (fixp->fx_where + fixp->fx_size
- > fixp->fx_frag->fr_fix + fixp->fx_frag->fr_offset)
- abort ();
- */
-
- s = bfd_install_relocation (stdoutput, reloc,
- fixp->fx_frag->fr_literal,
- fixp->fx_frag->fr_address,
- sec, &err);
- switch (s)
- {
- case bfd_reloc_ok:
- break;
- case bfd_reloc_overflow:
- as_bad_where (fixp->fx_file, fixp->fx_line,
- _("relocation overflow"));
- break;
- case bfd_reloc_outofrange:
- as_bad_where (fixp->fx_file, fixp->fx_line,
- _("relocation out of range"));
- break;
- default:
- as_fatal (_("%s:%u: bad return from bfd_install_relocation: %x"),
- fixp->fx_file, fixp->fx_line, s);
- }
- relocs[i++] = reloc;
+ else
+ rp = &r->next;
}
-#else
- n = n * MAX_RELOC_EXPANSION;
- /* Set up reloc information as well. */
- relocs = xcalloc (n, sizeof (arelent *));
- i = 0;
+ relocs = (arelent **) xcalloc (n, sizeof (arelent *));
+
+ n = 0;
+ r = my_reloc_list;
+ last_frag = NULL;
for (fixp = seginfo->fix_root; fixp != (fixS *) NULL; fixp = fixp->fx_next)
{
+ int fx_size, slack;
+ offsetT loc;
arelent **reloc;
- bfd_reloc_status_type s;
- symbolS *sym;
- int j;
+#ifndef RELOC_EXPANSION_POSSIBLE
+ arelent *rel;
- if (fixp->fx_done)
- {
- n--;
- continue;
- }
+ reloc = &rel;
+#endif
- reloc = tc_gen_reloc (sec, fixp);
+ if (fixp->fx_done)
+ continue;
- for (j = 0; reloc[j]; j++)
- {
- relocs[i++] = reloc[j];
- assert (i <= n);
- }
- if (fixp->fx_where + fixp->fx_size
- > fixp->fx_frag->fr_fix + fixp->fx_frag->fr_offset)
+ fx_size = fixp->fx_size;
+ slack = TC_FX_SIZE_SLACK (fixp);
+ if (slack > 0)
+ fx_size = fx_size > slack ? fx_size - slack : 0;
+ loc = fixp->fx_where + fx_size;
+ if (slack >= 0 && loc > fixp->fx_frag->fr_fix)
as_bad_where (fixp->fx_file, fixp->fx_line,
_("internal error: fixup not contained within frag"));
- for (j = 0; reloc[j]; j++)
+
+#ifndef RELOC_EXPANSION_POSSIBLE
+ *reloc = tc_gen_reloc (sec, fixp);
+#else
+ reloc = tc_gen_reloc (sec, fixp);
+#endif
+
+ while (*reloc)
{
- s = bfd_install_relocation (stdoutput, reloc[j],
- fixp->fx_frag->fr_literal,
- fixp->fx_frag->fr_address,
- sec, &err);
- switch (s)
+ while (r != NULL && r->u.b.r.address < (*reloc)->address)
{
- case bfd_reloc_ok:
- break;
- case bfd_reloc_overflow:
- as_bad_where (fixp->fx_file, fixp->fx_line,
- _("relocation overflow"));
- break;
- case bfd_reloc_outofrange:
- as_bad_where (fixp->fx_file, fixp->fx_line,
- _("relocation out of range"));
- break;
- default:
- as_fatal (_("%s:%u: bad return from bfd_install_relocation: %x"),
- fixp->fx_file, fixp->fx_line, s);
+ fragS *f = get_frag_for_reloc (last_frag, seginfo, r);
+ if (f != NULL)
+ {
+ last_frag = f;
+ relocs[n++] = &r->u.b.r;
+ install_reloc (sec, &r->u.b.r, f, r->file, r->line);
+ }
+ r = r->next;
}
+ relocs[n++] = *reloc;
+ install_reloc (sec, *reloc, fixp->fx_frag,
+ fixp->fx_file, fixp->fx_line);
+#ifndef RELOC_EXPANSION_POSSIBLE
+ break;
+#else
+ reloc++;
+#endif
}
}
- n = i;
-#endif
+
+ while (r != NULL)
+ {
+ fragS *f = get_frag_for_reloc (last_frag, seginfo, r);
+ if (f != NULL)
+ {
+ last_frag = f;
+ relocs[n++] = &r->u.b.r;
+ install_reloc (sec, &r->u.b.r, f, r->file, r->line);
+ }
+ r = r->next;
+ }
#ifdef DEBUG4
{
- unsigned int i, j, nsyms;
+ unsigned int k, j, nsyms;
asymbol **sympp;
sympp = bfd_get_outsymbols (stdoutput);
nsyms = bfd_get_symcount (stdoutput);
- for (i = 0; i < n; i++)
- if (((*relocs[i]->sym_ptr_ptr)->flags & BSF_SECTION_SYM) == 0)
+ for (k = 0; k < n; k++)
+ if (((*relocs[k]->sym_ptr_ptr)->flags & BSF_SECTION_SYM) == 0)
{
for (j = 0; j < nsyms; j++)
- if (sympp[j] == *relocs[i]->sym_ptr_ptr)
+ if (sympp[j] == *relocs[k]->sym_ptr_ptr)
break;
if (j == nsyms)
abort ();
#endif
if (n)
- bfd_set_reloc (stdoutput, sec, relocs, n);
- else
- bfd_set_section_flags (abfd, sec,
- (bfd_get_section_flags (abfd, sec)
- & (flagword) ~SEC_RELOC));
+ {
+ flagword flags = bfd_get_section_flags (abfd, sec);
+ flags |= SEC_RELOC;
+ bfd_set_section_flags (abfd, sec, flags);
+ bfd_set_reloc (stdoutput, sec, relocs, n);
+ }
#ifdef SET_SECTION_RELOCS
SET_SECTION_RELOCS (sec, relocs, n);
#ifdef DEBUG3
{
- unsigned int i;
- arelent *r;
- asymbol *s;
+ unsigned int k;
+
fprintf (stderr, "relocs for sec %s\n", sec->name);
- for (i = 0; i < n; i++)
+ for (k = 0; k < n; k++)
{
- r = relocs[i];
- s = *r->sym_ptr_ptr;
+ arelent *rel = relocs[k];
+ asymbol *s = *rel->sym_ptr_ptr;
fprintf (stderr, " reloc %2d @%p off %4lx : sym %-10s addend %lx\n",
- i, r, (unsigned long)r->address, s->name, (unsigned long)r->addend);
+ k, rel, (unsigned long)rel->address, s->name,
+ (unsigned long)rel->addend);
}
}
#endif
}
+static int
+compress_frag (struct z_stream_s *strm, const char *contents, int in_size,
+ fragS **last_newf, struct obstack *ob)
+{
+ int out_size;
+ int total_out_size = 0;
+ fragS *f = *last_newf;
+ char *next_out;
+ int avail_out;
+
+ /* Call the compression routine repeatedly until it has finished
+ processing the frag. */
+ while (in_size > 0)
+ {
+ /* Reserve all the space available in the current chunk.
+ If none is available, start a new frag. */
+ avail_out = obstack_room (ob);
+ if (avail_out <= 0)
+ {
+ obstack_finish (ob);
+ f = frag_alloc (ob);
+ f->fr_type = rs_fill;
+ (*last_newf)->fr_next = f;
+ *last_newf = f;
+ avail_out = obstack_room (ob);
+ }
+ if (avail_out <= 0)
+ as_fatal (_("can't extend frag"));
+ next_out = obstack_next_free (ob);
+ obstack_blank_fast (ob, avail_out);
+ out_size = compress_data (strm, &contents, &in_size,
+ &next_out, &avail_out);
+ if (out_size < 0)
+ return -1;
+
+ f->fr_fix += out_size;
+ total_out_size += out_size;
+
+ /* Return unused space. */
+ if (avail_out > 0)
+ obstack_blank_fast (ob, -avail_out);
+ }
+
+ return total_out_size;
+}
+
+static void
+compress_debug (bfd *abfd, asection *sec, void *xxx ATTRIBUTE_UNUSED)
+{
+ segment_info_type *seginfo = seg_info (sec);
+ fragS *f;
+ fragS *first_newf;
+ fragS *last_newf;
+ struct obstack *ob = &seginfo->frchainP->frch_obstack;
+ bfd_size_type uncompressed_size = (bfd_size_type) sec->size;
+ bfd_size_type compressed_size;
+ const char *section_name;
+ char *compressed_name;
+ char *header;
+ struct z_stream_s *strm;
+ int x;
+ flagword flags = bfd_get_section_flags (abfd, sec);
+
+ if (seginfo == NULL
+ || sec->size < 32
+ || (flags & (SEC_ALLOC | SEC_HAS_CONTENTS)) == SEC_ALLOC)
+ return;
+
+ section_name = bfd_get_section_name (stdoutput, sec);
+ if (strncmp (section_name, ".debug_", 7) != 0)
+ return;
+
+ strm = compress_init ();
+ if (strm == NULL)
+ return;
+
+ /* Create a new frag to contain the "ZLIB" header. */
+ first_newf = frag_alloc (ob);
+ if (obstack_room (ob) < 12)
+ first_newf = frag_alloc (ob);
+ if (obstack_room (ob) < 12)
+ as_fatal (_("can't extend frag %u chars"), 12);
+ last_newf = first_newf;
+ obstack_blank_fast (ob, 12);
+ last_newf->fr_type = rs_fill;
+ last_newf->fr_fix = 12;
+ header = last_newf->fr_literal;
+ memcpy (header, "ZLIB", 4);
+ header[11] = uncompressed_size; uncompressed_size >>= 8;
+ header[10] = uncompressed_size; uncompressed_size >>= 8;
+ header[9] = uncompressed_size; uncompressed_size >>= 8;
+ header[8] = uncompressed_size; uncompressed_size >>= 8;
+ header[7] = uncompressed_size; uncompressed_size >>= 8;
+ header[6] = uncompressed_size; uncompressed_size >>= 8;
+ header[5] = uncompressed_size; uncompressed_size >>= 8;
+ header[4] = uncompressed_size;
+ compressed_size = 12;
+
+ /* Stream the frags through the compression engine, adding new frags
+ as necessary to accomodate the compressed output. */
+ for (f = seginfo->frchainP->frch_root;
+ f;
+ f = f->fr_next)
+ {
+ offsetT fill_size;
+ char *fill_literal;
+ offsetT count;
+ int out_size;
+
+ gas_assert (f->fr_type == rs_fill);
+ if (f->fr_fix)
+ {
+ out_size = compress_frag (strm, f->fr_literal, f->fr_fix,
+ &last_newf, ob);
+ if (out_size < 0)
+ return;
+ compressed_size += out_size;
+ }
+ fill_literal = f->fr_literal + f->fr_fix;
+ fill_size = f->fr_var;
+ count = f->fr_offset;
+ gas_assert (count >= 0);
+ if (fill_size && count)
+ {
+ while (count--)
+ {
+ out_size = compress_frag (strm, fill_literal, (int) fill_size,
+ &last_newf, ob);
+ if (out_size < 0)
+ return;
+ compressed_size += out_size;
+ }
+ }
+ }
+
+ /* Flush the compression state. */
+ for (;;)
+ {
+ int avail_out;
+ char *next_out;
+ int out_size;
+
+ /* Reserve all the space available in the current chunk.
+ If none is available, start a new frag. */
+ avail_out = obstack_room (ob);
+ if (avail_out <= 0)
+ {
+ fragS *newf;
+
+ obstack_finish (ob);
+ newf = frag_alloc (ob);
+ newf->fr_type = rs_fill;
+ last_newf->fr_next = newf;
+ last_newf = newf;
+ avail_out = obstack_room (ob);
+ }
+ if (avail_out <= 0)
+ as_fatal (_("can't extend frag"));
+ next_out = obstack_next_free (ob);
+ obstack_blank_fast (ob, avail_out);
+ x = compress_finish (strm, &next_out, &avail_out, &out_size);
+ if (x < 0)
+ return;
+
+ last_newf->fr_fix += out_size;
+ compressed_size += out_size;
+
+ /* Return unused space. */
+ if (avail_out > 0)
+ obstack_blank_fast (ob, -avail_out);
+
+ if (x == 0)
+ break;
+ }
+
+ /* Replace the uncompressed frag list with the compressed frag list. */
+ seginfo->frchainP->frch_root = first_newf;
+ seginfo->frchainP->frch_last = last_newf;
+
+ /* Update the section size and its name. */
+ x = bfd_set_section_size (abfd, sec, compressed_size);
+ gas_assert (x);
+ compressed_name = (char *) xmalloc (strlen (section_name) + 2);
+ compressed_name[0] = '.';
+ compressed_name[1] = 'z';
+ strcpy (compressed_name + 2, section_name + 1);
+ bfd_section_name (stdoutput, sec) = compressed_name;
+}
+
static void
write_contents (bfd *abfd ATTRIBUTE_UNUSED,
asection *sec,
char *fill_literal;
offsetT count;
- assert (f->fr_type == rs_fill);
+ gas_assert (f->fr_type == rs_fill);
if (f->fr_fix)
{
x = bfd_set_section_contents (stdoutput, sec,
fill_literal = f->fr_literal + f->fr_fix;
fill_size = f->fr_var;
count = f->fr_offset;
- assert (count >= 0);
+ gas_assert (count >= 0);
if (fill_size && count)
{
char buf[256];
(stdoutput, sec, buf, (file_ptr) offset,
(bfd_size_type) n_per_buf * fill_size);
if (!x)
- as_fatal (_("cannot write to output file"));
+ as_fatal (_("cannot write to output file '%s': %s"),
+ stdoutput->filename,
+ bfd_errmsg (bfd_get_error ()));
offset += n_per_buf * fill_size;
}
}
int i;
bfd_size_type amt = (bfd_size_type) nsyms * sizeof (asymbol *);
- asympp = bfd_alloc (stdoutput, amt);
+ asympp = (asymbol **) bfd_alloc (stdoutput, amt);
symp = symbol_rootP;
for (i = 0; i < nsyms; i++, symp = symbol_next (symp))
{
asympp[i] = symbol_get_bfdsym (symp);
+ if (asympp[i]->flags != BSF_SECTION_SYM
+ || !(bfd_is_const_section (asympp[i]->section)
+ && asympp[i]->section->symbol == asympp[i]))
+ asympp[i]->flags |= BSF_KEEP;
symbol_mark_written (symp);
}
}
else
asympp = 0;
result = bfd_set_symtab (stdoutput, asympp, nsyms);
- assert (result);
+ gas_assert (result);
symbol_table_frozen = 1;
}
#endif
#endif
-void
-subsegs_finish (void)
+static void
+subsegs_finish_section (asection *s)
{
struct frchain *frchainP;
- asection *s;
+ segment_info_type *seginfo = seg_info (s);
+ if (!seginfo)
+ return;
- for (s = stdoutput->sections; s; s = s->next)
+ for (frchainP = seginfo->frchainP;
+ frchainP != NULL;
+ frchainP = frchainP->frch_next)
{
- segment_info_type *seginfo = seg_info (s);
- if (!seginfo)
- continue;
-
- for (frchainP = seginfo->frchainP;
- frchainP != NULL;
- frchainP = frchainP->frch_next)
- {
- int alignment = 0;
+ int alignment = 0;
- subseg_set (s, frchainP->frch_subseg);
+ subseg_set (s, frchainP->frch_subseg);
- /* This now gets called even if we had errors. In that case,
- any alignment is meaningless, and, moreover, will look weird
- if we are generating a listing. */
- if (!had_errors ())
+ /* This now gets called even if we had errors. In that case,
+ any alignment is meaningless, and, moreover, will look weird
+ if we are generating a listing. */
+ if (!had_errors ())
+ {
+ alignment = SUB_SEGMENT_ALIGN (now_seg, frchainP);
+ if ((bfd_get_section_flags (now_seg->owner, now_seg) & SEC_MERGE)
+ && now_seg->entsize)
{
- alignment = SUB_SEGMENT_ALIGN (now_seg, frchainP);
- if ((bfd_get_section_flags (now_seg->owner, now_seg) & SEC_MERGE)
- && now_seg->entsize)
- {
- unsigned int entsize = now_seg->entsize;
- int entalign = 0;
+ unsigned int entsize = now_seg->entsize;
+ int entalign = 0;
- while ((entsize & 1) == 0)
- {
- ++entalign;
- entsize >>= 1;
- }
- if (entalign > alignment)
- alignment = entalign;
+ while ((entsize & 1) == 0)
+ {
+ ++entalign;
+ entsize >>= 1;
}
+
+ if (entalign > alignment)
+ alignment = entalign;
}
+ }
- if (subseg_text_p (now_seg))
- frag_align_code (alignment, 0);
- else
- frag_align (alignment, 0, 0);
+ if (subseg_text_p (now_seg))
+ frag_align_code (alignment, 0);
+ else
+ frag_align (alignment, 0, 0);
- /* frag_align will have left a new frag.
- Use this last frag for an empty ".fill".
+ /* frag_align will have left a new frag.
+ Use this last frag for an empty ".fill".
- For this segment ...
- Create a last frag. Do not leave a "being filled in frag". */
- frag_wane (frag_now);
- frag_now->fr_fix = 0;
- know (frag_now->fr_next == NULL);
- }
+ For this segment ...
+ Create a last frag. Do not leave a "being filled in frag". */
+ frag_wane (frag_now);
+ frag_now->fr_fix = 0;
+ know (frag_now->fr_next == NULL);
+ }
+}
+
+static void
+subsegs_finish (void)
+{
+ asection *s;
+
+ for (s = stdoutput->sections; s; s = s->next)
+ subsegs_finish_section (s);
+}
+
+#ifdef OBJ_ELF
+static void
+create_obj_attrs_section (void)
+{
+ segT s;
+ char *p;
+ offsetT size;
+ const char *name;
+
+ size = bfd_elf_obj_attr_size (stdoutput);
+ if (size)
+ {
+ 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);
}
}
+#endif
/* Write the object file. */
fragS *fragP; /* Track along all frags. */
#endif
- /* Do we really want to write it? */
- {
- int n_warns, n_errs;
- n_warns = had_warnings ();
- n_errs = had_errors ();
- /* The -Z flag indicates that an object file should be generated,
- regardless of warnings and errors. */
- if (flag_always_generate_output)
- {
- if (n_warns || n_errs)
- as_warn (_("%d error%s, %d warning%s, generating bad object file"),
- n_errs, n_errs == 1 ? "" : "s",
- n_warns, n_warns == 1 ? "" : "s");
- }
- else
- {
- if (n_errs)
- as_fatal (_("%d error%s, %d warning%s, no object file generated"),
- n_errs, n_errs == 1 ? "" : "s",
- n_warns, n_warns == 1 ? "" : "s");
- }
- }
+ subsegs_finish ();
+
+#ifdef md_pre_output_hook
+ md_pre_output_hook;
+#endif
-#ifdef OBJ_VMS
- /* Under VMS we try to be compatible with VAX-11 "C". Thus, we call
- a routine to check for the definition of the procedure "_main",
- and if so -- fix it up so that it can be program entry point. */
- vms_check_for_main ();
-#endif /* OBJ_VMS */
+#ifdef md_pre_relax_hook
+ md_pre_relax_hook;
+#endif
/* From now on, we don't care about sub-segments. Build one frag chain
for each segment. Linked thru fr_next. */
md_post_relax_hook;
#endif
+#ifdef OBJ_ELF
+ if (IS_ELF)
+ create_obj_attrs_section ();
+#endif
+
#ifndef WORKING_DOT_WORD
{
struct broken_word *lie;
#ifdef TC_CONS_FIX_NEW
TC_CONS_FIX_NEW (lie->frag,
lie->word_goes_here - lie->frag->fr_literal,
- 2, &exp);
+ 2, &exp, TC_PARSE_CONS_RETURN_NONE);
#else
fix_new_exp (lie->frag,
lie->word_goes_here - lie->frag->fr_literal,
if (lie->added == 2)
continue;
/* Patch the jump table. */
- /* This is the offset from ??? to table_ptr+0. */
- to_addr = table_addr - S_GET_VALUE (lie->sub);
-#ifdef TC_CHECK_ADJUSTED_BROKEN_DOT_WORD
- TC_CHECK_ADJUSTED_BROKEN_DOT_WORD (to_addr, lie);
-#endif
- md_number_to_chars (lie->word_goes_here, to_addr, 2);
- for (untruth = lie->next_broken_word;
+ for (untruth = (struct broken_word *) (fragP->fr_symbol);
untruth && untruth->dispfrag == fragP;
untruth = untruth->next_broken_word)
{
if (untruth->use_jump == lie)
- md_number_to_chars (untruth->word_goes_here, to_addr, 2);
+ {
+ /* This is the offset from ??? to table_ptr+0.
+ The target is the same for all users of this
+ md_long_jump, but the "sub" bases (and hence the
+ offsets) may be different. */
+ addressT to_word = table_addr - S_GET_VALUE (untruth->sub);
+#ifdef TC_CHECK_ADJUSTED_BROKEN_DOT_WORD
+ TC_CHECK_ADJUSTED_BROKEN_DOT_WORD (to_word, untruth);
+#endif
+ md_number_to_chars (untruth->word_goes_here, to_word, 2);
+ }
}
/* Install the long jump. */
resolve_symbol_value (symp);
}
resolve_local_symbol_values ();
+ resolve_reloc_expr_symbols ();
PROGRESS (1);
if (symbol_equated_reloc_p (symp)
|| S_IS_WEAKREFR (symp))
{
- const char *name = S_GET_NAME (symp);
+ const char *sname = S_GET_NAME (symp);
+
if (S_IS_COMMON (symp)
- && !TC_FAKE_LABEL (name)
+ && !TC_FAKE_LABEL (sname)
&& !S_IS_WEAKREFR (symp)
&& (!S_IS_EXTERNAL (symp) || S_IS_LOCAL (symp)))
{
expressionS *e = symbol_get_value_expression (symp);
+
as_bad (_("Local symbol `%s' can't be equated to common symbol `%s'"),
- name, S_GET_NAME (e->X_add_symbol));
+ sname, S_GET_NAME (e->X_add_symbol));
+ }
+ if (S_GET_SEGMENT (symp) == reg_section)
+ {
+ /* Report error only if we know the symbol name. */
+ if (S_GET_NAME (symp) != reg_section->name)
+ as_bad (_("can't make global register symbol `%s'"),
+ sname);
}
symbol_remove (symp, &symbol_rootP, &symbol_lastP);
continue;
obj_adjust_symtab ();
#endif
+ /* Stop if there is an error. */
+ if (had_errors ())
+ return;
+
/* Now that all the sizes are known, and contents correct, we can
start writing to the file. */
set_symtab ();
#ifdef obj_frob_file
obj_frob_file ();
#endif
-
+#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
obj_frob_file_after_relocs ();
#endif
+ /* Once all relocations have been written, we can compress the
+ contents of the debug sections. This needs to be done before
+ we start writing any sections, because it will affect the file
+ layout, which is fixed once we start writing contents. */
+ if (flag_compress_debug)
+ bfd_map_over_sections (stdoutput, compress_debug, (char *) 0);
+
bfd_map_over_sections (stdoutput, write_contents, (char *) 0);
}
|| sym_frag == &zero_address_frag);
target += S_GET_VALUE (symbolP);
- /* If frag has yet to be reached on this pass,
- assume it will move by STRETCH just as we did.
- If this is not so, it will be because some frag
- between grows, and that will force another pass. */
+ /* If SYM_FRAG has yet to be reached on this pass, assume it
+ will move by STRETCH just as we did, unless there is an
+ alignment frag between here and SYM_FRAG. An alignment may
+ well absorb any STRETCH, and we don't want to choose a larger
+ branch insn by overestimating the needed reach of this
+ branch. It isn't critical to calculate TARGET exactly; We
+ know we'll be doing another pass if STRETCH is non-zero. */
if (stretch != 0
&& sym_frag->relax_marker != fragP->relax_marker
&& S_GET_SEGMENT (symbolP) == segment)
{
- target += stretch;
+ if (stretch < 0
+ || sym_frag->region == fragP->region)
+ target += stretch;
+ /* If we get here we know we have a forward branch. This
+ relax pass may have stretched previous instructions so
+ far that omitting STRETCH would make the branch
+ 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;
}
}
/* Relax_align. Advance location counter to next address that has 'alignment'
lowest order bits all 0s, return size of adjustment made. */
static relax_addressT
-relax_align (register relax_addressT address, /* Address now. */
- register int alignment /* Alignment (binary). */)
+relax_align (relax_addressT address, /* Address now. */
+ int alignment /* Alignment (binary). */)
{
relax_addressT mask;
relax_addressT new_address;
- mask = ~((~0) << alignment);
+ mask = ~((relax_addressT) ~0 << alignment);
new_address = (address + mask) & (~mask);
#ifdef LINKER_RELAXING_SHRINKS_ONLY
if (linkrelax)
unsigned long frag_count;
struct frag *fragP;
relax_addressT address;
+ int region;
int ret;
/* In case md_estimate_size_before_relax() wants to make fixSs. */
/* For each frag in segment: count and store (a 1st guess of)
fr_address. */
address = 0;
+ region = 0;
for (frag_count = 0, fragP = segment_frag_root;
fragP;
fragP = fragP->fr_next, frag_count ++)
{
+ fragP->region = region;
fragP->relax_marker = 0;
fragP->fr_address = address;
address += fragP->fr_fix;
}
address += offset;
+ region += 1;
}
break;
case rs_org:
- case rs_space:
/* Assume .org is nugatory. It will grow with 1st relax. */
+ region += 1;
+ break;
+
+ case rs_space:
break;
case rs_machine_dependent:
/* Do relax(). */
{
unsigned long max_iterations;
- offsetT stretch; /* May be any size, 0 or negative. */
- /* Cumulative number of addresses we have relaxed this pass.
- We may have relaxed more than one address. */
- int stretched; /* Have we stretched on this pass? */
- /* This is 'cuz stretch may be zero, when, in fact some piece of code
- grew, and another shrank. If a branch instruction doesn't fit anymore,
- we could be scrod. */
+
+ /* Cumulative address adjustment. */
+ offsetT stretch;
+
+ /* Have we made any adjustment this pass? We can't just test
+ stretch because one piece of code may have grown and another
+ shrank. */
+ int stretched;
+
+ /* Most horrible, but gcc may give us some exception data that
+ is impossible to assemble, of the form
+
+ .align 4
+ .byte 0, 0
+ .uleb128 end - start
+ start:
+ .space 128*128 - 1
+ .align 4
+ end:
+
+ If the leb128 is two bytes in size, then end-start is 128*128,
+ which requires a three byte leb128. If the leb128 is three
+ bytes in size, then end-start is 128*128-1, which requires a
+ two byte leb128. We work around this dilemma by inserting
+ an extra 4 bytes of alignment just after the .align. This
+ works because the data after the align is accessed relative to
+ the end label.
+
+ This counter is used in a tiny state machine to detect
+ whether a leb128 followed by an align is impossible to
+ relax. */
+ int rs_leb128_fudge = 0;
/* We want to prevent going into an infinite loop where one frag grows
depending upon the location of a symbol which is in turn moved by
S_GET_NAME (lie->sub),
buf);
}
- lie->added = 1;
if (fragP->fr_subtype == 0)
{
fragP->fr_subtype++;
growth += md_short_jump_size;
}
- for (untruth = lie->next_broken_word;
+
+ /* Redirect *all* words of this table with the same
+ target, lest we have to handle the case where the
+ same target but with a offset that fits on this
+ round overflows at the next relaxation round. */
+ for (untruth = (struct broken_word *) (fragP->fr_symbol);
untruth && untruth->dispfrag == lie->dispfrag;
untruth = untruth->next_broken_word)
if ((symbol_get_frag (untruth->add)
untruth->added = 2;
untruth->use_jump = lie;
}
+
+ lie->added = 1;
growth += md_long_jump_size;
}
}
}
growth = newoff - oldoff;
+
+ /* If this align happens to follow a leb128 and
+ we have determined that the leb128 is bouncing
+ in size, then break the cycle by inserting an
+ extra alignment. */
+ if (growth < 0
+ && (rs_leb128_fudge & 16) != 0
+ && (rs_leb128_fudge & 15) >= 2)
+ {
+ segment_info_type *seginfo = seg_info (segment);
+ struct obstack *ob = &seginfo->frchainP->frch_obstack;
+ struct frag *newf;
+
+ newf = frag_alloc (ob);
+ obstack_blank_fast (ob, fragP->fr_var);
+ obstack_finish (ob);
+ memcpy (newf, fragP, SIZEOF_STRUCT_FRAG);
+ memcpy (newf->fr_literal,
+ fragP->fr_literal + fragP->fr_fix,
+ fragP->fr_var);
+ newf->fr_type = rs_fill;
+ newf->fr_address = address + fragP->fr_fix + newoff;
+ newf->fr_fix = 0;
+ newf->fr_offset = (((offsetT) 1 << fragP->fr_offset)
+ / fragP->fr_var);
+ if (newf->fr_offset * newf->fr_var
+ != (offsetT) 1 << fragP->fr_offset)
+ {
+ newf->fr_offset = (offsetT) 1 << fragP->fr_offset;
+ newf->fr_var = 1;
+ }
+ /* Include size of new frag in GROWTH. */
+ growth += newf->fr_offset * newf->fr_var;
+ /* Adjust the new frag address for the amount
+ we'll add when we process the new frag. */
+ newf->fr_address -= stretch + growth;
+ newf->relax_marker ^= 1;
+ fragP->fr_next = newf;
+#ifdef DEBUG
+ as_warn (_("padding added"));
+#endif
+ }
}
break;
}
know (fragP->fr_next);
- after = fragP->fr_next->fr_address;
+ after = fragP->fr_next->fr_address + stretch;
growth = target - after;
if (growth < 0)
{
fragP->fr_type = rs_align;
fragP->fr_subtype = 0;
fragP->fr_offset = 0;
- fragP->fr_fix = after - was_address;
- break;
+ fragP->fr_fix = after - address;
}
-
- /* This is an absolute growth factor */
- growth -= stretch;
- break;
}
+ break;
case rs_space:
growth = 0;
{
stretch += growth;
stretched = 1;
+ if (fragP->fr_type == rs_leb128)
+ rs_leb128_fudge += 16;
+ else if (fragP->fr_type == rs_align
+ && (rs_leb128_fudge & 16) != 0
+ && stretch == 0)
+ rs_leb128_fudge += 16;
+ else
+ rs_leb128_fudge = 0;
}
}
+
+ if (stretch == 0
+ && (rs_leb128_fudge & 16) == 0
+ && (rs_leb128_fudge & -16) != 0)
+ rs_leb128_fudge += 1;
+ else
+ rs_leb128_fudge = 0;
}
/* Until nothing further to relax. */
while (stretched && -- max_iterations);
print_fixup (fixS *fixp)
{
indent_level = 1;
- fprintf (stderr, "fix %lx %s:%d", (long) fixp, fixp->fx_file, fixp->fx_line);
+ fprintf (stderr, "fix ");
+ fprintf_vma (stderr, (bfd_vma)((bfd_hostptr_t) fixp));
+ fprintf (stderr, " %s:%d",fixp->fx_file, fixp->fx_line);
if (fixp->fx_pcrel)
fprintf (stderr, " pcrel");
if (fixp->fx_pcrel_adjust)
fprintf (stderr, " tcbit");
if (fixp->fx_done)
fprintf (stderr, " done");
- fprintf (stderr, "\n size=%d frag=%lx where=%ld offset=%lx addnumber=%lx",
- fixp->fx_size, (long) fixp->fx_frag, (long) fixp->fx_where,
- (long) fixp->fx_offset, (long) fixp->fx_addnumber);
+ fprintf (stderr, "\n size=%d frag=", fixp->fx_size);
+ fprintf_vma (stderr, (bfd_vma) ((bfd_hostptr_t) fixp->fx_frag));
+ fprintf (stderr, " where=%ld offset=%lx addnumber=%lx",
+ (long) fixp->fx_where,
+ (unsigned long) fixp->fx_offset,
+ (unsigned long) fixp->fx_addnumber);
fprintf (stderr, "\n %s (%d)", bfd_get_reloc_code_name (fixp->fx_r_type),
fixp->fx_r_type);
if (fixp->fx_addsy)
projects / deliverable / binutils-gdb.git / blobdiff