static seg_list *fini_literal_head = &fini_literal_head_h;
+/* Lists of symbols. We keep a list of symbols that label the current
+ instruction, so that we can adjust the symbols when inserting alignment
+ for various instructions. We also keep a list of all the symbols on
+ literals, so that we can fix up those symbols when the literals are
+ later moved into the text sections. */
+
+typedef struct sym_list_struct
+{
+ struct sym_list_struct *next;
+ symbolS *sym;
+} sym_list;
+
+static sym_list *insn_labels = NULL;
+static sym_list *free_insn_labels = NULL;
+static sym_list *saved_insn_labels = NULL;
+
+static sym_list *literal_syms;
+
+
/* Global flag to indicate when we are emitting literals. */
int generating_literals = 0;
static bfd_boolean is_negatable_branch
PARAMS ((TInsn *));
-/* Functions for Internal Lists of Symbols. */
-static void xtensa_define_label
- PARAMS ((symbolS *));
-static void add_target_symbol
- PARAMS ((symbolS *, bfd_boolean));
-static symbolS *xtensa_find_label
- PARAMS ((fragS *, offsetT, bfd_boolean));
-static void map_over_defined_symbols
- PARAMS ((void (*fn) (symbolS *)));
-static bfd_boolean is_loop_target_label
- PARAMS ((symbolS *));
-static void xtensa_mark_target_fragments
- PARAMS ((void));
-
/* Various Other Internal Functions. */
static bfd_boolean is_unique_insn_expansion
PARAMS ((int));
static symbolS *xtensa_create_literal_symbol
PARAMS ((segT, fragS *));
+static void xtensa_add_literal_sym
+ PARAMS ((symbolS *));
+static void xtensa_add_insn_label
+ PARAMS ((symbolS *));
+static void xtensa_clear_insn_labels
+ PARAMS ((void));
static bfd_boolean get_is_linkonce_section
PARAMS ((bfd *, segT));
static bfd_boolean xg_emit_insn
static void xtensa_mark_literal_pool_location
PARAMS ((void));
static void xtensa_move_labels
- PARAMS ((fragS *, valueT, fragS *, valueT));
+ PARAMS ((fragS *, valueT, bfd_boolean));
static void assemble_nop
PARAMS ((size_t, char *));
static addressT get_expanded_loop_offset
PARAMS ((seg_list *));
static void xtensa_move_literals
PARAMS ((void));
-static void xtensa_move_frag_symbol
- PARAMS ((symbolS *));
-static void xtensa_move_frag_symbols
- PARAMS ((void));
static void xtensa_reorder_seg_list
PARAMS ((seg_list *, segT));
static void xtensa_reorder_segments
int len;
lit_state *ls;
+ md_flush_pending_output ();
+
get_directive (&directive, &negated);
if (directive == (directiveE) XTENSA_UNDEFINED)
{
switch (directive)
{
case directive_literal:
+ if (!inside_directive (directive_literal))
+ {
+ /* Previous labels go with whatever follows this directive, not with
+ the literal, so save them now. */
+ saved_insn_labels = insn_labels;
+ insn_labels = NULL;
+ }
state = (emit_state *) xmalloc (sizeof (emit_state));
xtensa_switch_to_literal_fragment (state);
directive_push (directive_literal, negated, state);
emit_state *state;
lit_state *s;
+ md_flush_pending_output ();
+
get_directive (&end_directive, &end_negated);
if (end_directive == (directiveE) XTENSA_UNDEFINED)
{
frag_var (rs_fill, 0, 0, 0, NULL, 0, NULL);
xtensa_restore_emit_state (state);
free (state);
+ if (!inside_directive (directive_literal))
+ {
+ /* Restore the list of current labels. */
+ xtensa_clear_insn_labels ();
+ insn_labels = saved_insn_labels;
+ }
break;
case directive_freeregs:
xtensa_mark_literal_pool_location ();
demand_empty_rest_of_line ();
+ xtensa_clear_insn_labels ();
}
expressionS expP;
segT dest_seg;
+ if (inside_directive (directive_literal))
+ {
+ as_bad (_(".literal not allowed inside .begin literal region"));
+ ignore_rest_of_line ();
+ return;
+ }
+
+ /* Previous labels go with whatever follows this directive, not with
+ the literal, so save them now. */
+ saved_insn_labels = insn_labels;
+ insn_labels = NULL;
+
/* If we are using text-section literals, then this is the right value... */
dest_seg = now_seg;
demand_empty_rest_of_line ();
xtensa_restore_emit_state (&state);
+
+ /* Restore the list of current labels. */
+ xtensa_clear_insn_labels ();
+ insn_labels = saved_insn_labels;
}
return FALSE;
}
-\f
-/* Lists for recording various properties of symbols. */
-
-typedef struct symbol_consS_struct
-{
- symbolS *first;
- /* These are used for the target taken. */
- int is_loop_target:1;
- int is_branch_target:1;
- int is_literal:1;
- int is_moved:1;
- struct symbol_consS_struct *rest;
-} symbol_consS;
-
-symbol_consS *defined_symbols = 0;
-symbol_consS *branch_targets = 0;
-
-
-static void
-xtensa_define_label (sym)
- symbolS *sym;
-{
- symbol_consS *cons = (symbol_consS *) xmalloc (sizeof (symbol_consS));
-
- cons->first = sym;
- cons->is_branch_target = 0;
- cons->is_loop_target = 0;
- cons->is_literal = generating_literals ? 1 : 0;
- cons->is_moved = 0;
- cons->rest = defined_symbols;
- defined_symbols = cons;
-}
-
-
-void
-add_target_symbol (sym, is_loop)
- symbolS *sym;
- bfd_boolean is_loop;
-{
- symbol_consS *cons, *sym_e;
-
- for (sym_e = branch_targets; sym_e; sym_e = sym_e->rest)
- {
- if (sym_e->first == sym)
- {
- if (is_loop)
- sym_e->is_loop_target = 1;
- else
- sym_e->is_branch_target = 1;
- return;
- }
- }
-
- cons = (symbol_consS *) xmalloc (sizeof (symbol_consS));
- cons->first = sym;
- cons->is_branch_target = (is_loop ? 0 : 1);
- cons->is_loop_target = (is_loop ? 1 : 0);
- cons->rest = branch_targets;
- branch_targets = cons;
-}
-
-
-/* Find the symbol at a given position. (Note: the "loops_ok"
- argument is provided to allow ignoring labels that define loop
- ends. This fixes a bug where the NOPs to align a loop opcode were
- included in a previous zero-cost loop:
-
- loop a0, loopend
- <loop1 body>
- loopend:
-
- loop a2, loopend2
- <loop2 body>
-
- would become:
-
- loop a0, loopend
- <loop1 body>
- nop.n <===== bad!
- loopend:
-
- loop a2, loopend2
- <loop2 body>
-
- This argument is used to prevent moving the NOP to before the
- loop-end label, which is what you want in this special case.) */
-
-static symbolS *
-xtensa_find_label (fragP, offset, loops_ok)
- fragS *fragP;
- offsetT offset;
- bfd_boolean loops_ok;
-{
- symbol_consS *consP;
-
- for (consP = defined_symbols; consP; consP = consP->rest)
- {
- symbolS *symP = consP->first;
-
- if (S_GET_SEGMENT (symP) == now_seg
- && symbol_get_frag (symP) == fragP
- && symbol_constant_p (symP)
- && S_GET_VALUE (symP) == fragP->fr_address + (unsigned) offset
- && (loops_ok || !is_loop_target_label (symP)))
- return symP;
- }
- return NULL;
-}
-
-
-static void
-map_over_defined_symbols (fn)
- void (*fn) PARAMS ((symbolS *));
-{
- symbol_consS *sym_cons;
-
- for (sym_cons = defined_symbols; sym_cons; sym_cons = sym_cons->rest)
- fn (sym_cons->first);
-}
-
-
-static bfd_boolean
-is_loop_target_label (sym)
- symbolS *sym;
-{
- symbol_consS *sym_e;
-
- for (sym_e = branch_targets; sym_e; sym_e = sym_e->rest)
- {
- if (sym_e->first == sym)
- return sym_e->is_loop_target;
- }
- return FALSE;
-}
-
-
-/* Walk over all of the symbols that are branch target labels and
- loop target labels. Mark the associated fragments for these with
- the appropriate flags. */
-
-static void
-xtensa_mark_target_fragments ()
-{
- symbol_consS *sym_e;
-
- for (sym_e = branch_targets; sym_e; sym_e = sym_e->rest)
- {
- symbolS *sym = sym_e->first;
-
- if (symbol_get_frag (sym)
- && symbol_constant_p (sym)
- && S_GET_VALUE (sym) == 0)
- {
- if (sym_e->is_branch_target)
- symbol_get_frag (sym)->tc_frag_data.is_branch_target = TRUE;
- if (sym_e->is_loop_target)
- symbol_get_frag (sym)->tc_frag_data.is_loop_target = TRUE;
- }
- }
-}
-
\f
/* Various Other Internal Functions. */
char *kind = xtensa_operand_kind (opnd);
if (strlen (kind) == 1 && *kind == 'l')
if (insn->tok[i].X_op == O_symbol)
- add_target_symbol (insn->tok[i].X_add_symbol, TRUE);
+ symbol_get_tc (insn->tok[i].X_add_symbol)->is_loop_target = TRUE;
return;
}
char *kind = xtensa_operand_kind (opnd);
if (strlen (kind) == 1 && *kind == 'l'
&& insn->tok[i].X_op == O_symbol)
- add_target_symbol (insn->tok[i].X_add_symbol, FALSE);
+ {
+ symbolS *sym = insn->tok[i].X_add_symbol;
+ symbol_get_tc (sym)->is_branch_target = TRUE;
+ if (S_IS_DEFINED (sym))
+ symbol_get_frag (sym)->tc_frag_data.is_branch_target = TRUE;
+ }
}
}
}
else
symbolP = symbol_new (name, sec, 0, frag);
+ xtensa_add_literal_sym (symbolP);
+
frag->tc_frag_data.is_literal = TRUE;
lit_num++;
return symbolP;
}
+static void
+xtensa_add_literal_sym (sym)
+ symbolS *sym;
+{
+ sym_list *l;
+
+ l = (sym_list *) xmalloc (sizeof (sym_list));
+ l->sym = sym;
+ l->next = literal_syms;
+ literal_syms = l;
+}
+
+
+static void
+xtensa_add_insn_label (sym)
+ symbolS *sym;
+{
+ sym_list *l;
+
+ if (!free_insn_labels)
+ l = (sym_list *) xmalloc (sizeof (sym_list));
+ else
+ {
+ l = free_insn_labels;
+ free_insn_labels = l->next;
+ }
+
+ l->sym = sym;
+ l->next = insn_labels;
+ insn_labels = l;
+}
+
+
+static void
+xtensa_clear_insn_labels (void)
+{
+ sym_list **pl;
+
+ for (pl = &free_insn_labels; *pl != NULL; pl = &(*pl)->next)
+ ;
+ *pl = insn_labels;
+ insn_labels = NULL;
+}
+
+
/* Return true if the section flags are marked linkonce
or the name is .gnu.linkonce*. */
}
+/* The "loops_ok" argument is provided to allow ignoring labels that
+ define loop ends. This fixes a bug where the NOPs to align a
+ loop opcode were included in a previous zero-cost loop:
+
+ loop a0, loopend
+ <loop1 body>
+ loopend:
+
+ loop a2, loopend2
+ <loop2 body>
+
+ would become:
+
+ loop a0, loopend
+ <loop1 body>
+ nop.n <===== bad!
+ loopend:
+
+ loop a2, loopend2
+ <loop2 body>
+
+ This argument is used to prevent moving the NOP to before the
+ loop-end label, which is what you want in this special case. */
+
static void
-xtensa_move_labels (old_frag, old_offset, new_frag, new_offset)
- fragS *old_frag;
- valueT old_offset;
- fragS *new_frag ATTRIBUTE_UNUSED;
+xtensa_move_labels (new_frag, new_offset, loops_ok)
+ fragS *new_frag;
valueT new_offset;
+ bfd_boolean loops_ok;
{
- symbolS *old_sym;
+ sym_list *lit;
- /* Repeat until there are no more.... */
- for (old_sym = xtensa_find_label (old_frag, old_offset, TRUE);
- old_sym;
- old_sym = xtensa_find_label (old_frag, old_offset, TRUE))
+ for (lit = insn_labels; lit; lit = lit->next)
{
- S_SET_VALUE (old_sym, (valueT) new_offset);
- symbol_set_frag (old_sym, frag_now);
+ symbolS *lit_sym = lit->sym;
+ if (loops_ok || symbol_get_tc (lit_sym)->is_loop_target == 0)
+ {
+ S_SET_VALUE (lit_sym, new_offset);
+ symbol_set_frag (lit_sym, new_frag);
+ }
}
}
xtensa_frob_label (sym)
symbolS *sym;
{
- xtensa_define_label (sym);
- if (is_loop_target_label (sym)
+ if (generating_literals)
+ xtensa_add_literal_sym (sym);
+ else
+ xtensa_add_insn_label (sym);
+
+ if (symbol_get_tc (sym)->is_loop_target
&& (get_last_insn_flags (now_seg, now_subseg)
& FLAG_IS_BAD_LOOPEND) != 0)
as_bad (_("invalid last instruction for a zero-overhead loop"));
&& !is_unaligned_label (sym)
&& !frag_now->tc_frag_data.is_literal)
{
- fragS *old_frag = frag_now;
- offsetT old_offset = frag_now_fix ();
/* frag_now->tc_frag_data.is_insn = TRUE; */
frag_var (rs_machine_dependent, 4, 4,
RELAX_DESIRE_ALIGN_IF_TARGET,
frag_now->fr_symbol, frag_now->fr_offset, NULL);
- xtensa_move_labels (old_frag, old_offset, frag_now, 0);
- /* Once we know whether or not the label is a branch target
- We will suppress some of these alignments. */
+ xtensa_move_labels (frag_now, 0, TRUE);
+
+ /* If the label is already known to be a branch target, i.e., a
+ forward branch, mark the frag accordingly. Backward branches
+ are handled by xg_add_branch_and_loop_targets. */
+ if (symbol_get_tc (sym)->is_branch_target)
+ symbol_get_frag (sym)->tc_frag_data.is_branch_target = TRUE;
+
+ /* Loops only go forward, so they can be identified here. */
+ if (symbol_get_tc (sym)->is_loop_target)
+ symbol_get_frag (sym)->tc_frag_data.is_loop_target = TRUE;
}
}
frag_new (0);
}
frag_now->tc_frag_data.is_insn = FALSE;
+
+ xtensa_clear_insn_labels ();
}
/* Special cases for instructions that force an alignment... */
if (!orig_insn.is_specific_opcode && is_loop_opcode (orig_insn.opcode))
{
- fragS *old_frag = frag_now;
- offsetT old_offset = frag_now_fix ();
- symbolS *old_sym = NULL;
size_t max_fill;
frag_now->tc_frag_data.is_insn = TRUE;
RELAX_ALIGN_NEXT_OPCODE, frag_now->fr_symbol,
frag_now->fr_offset, NULL);
- /* Repeat until there are no more. */
- while ((old_sym = xtensa_find_label (old_frag, old_offset, FALSE)))
- {
- S_SET_VALUE (old_sym, (valueT) 0);
- symbol_set_frag (old_sym, frag_now);
- }
+ xtensa_move_labels (frag_now, 0, FALSE);
}
/* Special-case for "entry" instruction. */
if (!orig_insn.is_specific_opcode)
{
- fragS *label_target = frag_now;
- offsetT label_offset = frag_now_fix ();
-
xtensa_mark_literal_pool_location ();
/* Automatically align ENTRY instructions. */
- xtensa_move_labels (label_target, label_offset, frag_now, 0);
+ xtensa_move_labels (frag_now, 0, TRUE);
frag_align (2, 0, 0);
}
}
+ /* Any extra alignment frags have been inserted now, and we're about to
+ emit a new instruction so clear the list of labels. */
+ xtensa_clear_insn_labels ();
+
if (software_a0_b_retw_interlock)
set_last_insn_flags (now_seg, now_subseg, FLAG_IS_A0_WRITER,
is_register_writer (&orig_insn, "a", 0));
xtensa_move_literals ();
xtensa_reorder_segments ();
- xtensa_mark_target_fragments ();
xtensa_cleanup_align_frags ();
xtensa_fix_target_frags ();
if (software_a0_b_retw_interlock && has_a0_b_retw)
emit_state state;
segT dest_seg;
fixS *fix, *next_fix, **fix_splice;
+ sym_list *lit;
/* As clunky as this is, we can't rely on frag_var
and frag_variant to get called in all situations. */
segment = segment->next;
}
- xtensa_move_frag_symbols ();
-}
-
-
-static void
-xtensa_move_frag_symbol (sym)
- symbolS *sym;
-{
- fragS *frag = symbol_get_frag (sym);
-
- if (frag->tc_frag_data.lit_seg != (segT) 0)
- S_SET_SEGMENT (sym, frag->tc_frag_data.lit_seg);
-}
-
-
-static void
-xtensa_move_frag_symbols ()
-{
- symbolS *symbolP;
-
- /* Although you might think that only one of these lists should be
- searched, it turns out that the difference of the two sets
- (either way) is not empty. They do overlap quite a bit,
- however. */
-
- for (symbolP = symbol_rootP; symbolP; symbolP = symbolP->sy_next)
- xtensa_move_frag_symbol (symbolP);
-
- map_over_defined_symbols (xtensa_move_frag_symbol);
+ /* Now fix up the SEGMENT value for all the literal symbols. */
+ for (lit = literal_syms; lit; lit = lit->next)
+ {
+ symbolS *lit_sym = lit->sym;
+ segT dest_seg = symbol_get_frag (lit_sym)->tc_frag_data.lit_seg;
+ S_SET_SEGMENT (lit_sym, dest_seg);
+ }
}
projects / deliverable / binutils-gdb.git / commitdiff
