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MIPS/fix_loongson3_llsc: fix when target has multi labels 

When there is multi-labels on the same insn, the current code
will take care about the last one. it may cause that no sync
is added at the target.

Here we scan all labels with same value of
   S_GET_VALUE(label_list->label)
by label_list->next.

2020-02-28  YunQiang Su  <syq@debian.org>

    PR gas/25539
    * config/tc-mips.c (fix_loongson3_llsc): Compare label value
    to handle multi-labels.
    (has_label_name): New.
This commit is contained in:
YunQiang Su 2020-02-28 15:58:13 +08:00 committed by Chenghua Xu
parent 182ec6707c
commit dec7b24be8
2 changed files with 51 additions and 5 deletions
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7
gas/ChangeLog
View File

@ -1,3 +1,10 @@
2020-02-28 YunQiang Su <syq@debian.org>
PR gas/25539
* config/tc-mips.c (fix_loongson3_llsc): Compare label value
to handle multi-labels.
(has_label_name): New.
2020-02-26 Matthew Malcomson <matthew.malcomson@arm.com>
* config/tc-arm.c (enum pred_instruction_type): Remove

49
gas/config/tc-mips.c
View File

@ -812,6 +812,9 @@ static int mips_debug = 0;
fill a branch delay slot. */
static struct mips_cl_insn history[1 + MAX_NOPS + MAX_LLSC_RANGE];
/* The maximum number of LABELS detect for the same address. */
#define MAX_LABELS_SAME 10
/* Arrays of operands for each instruction. */
#define MAX_OPERANDS 6
struct mips_operand_array
@ -6901,7 +6904,21 @@ fix_loongson2f (struct mips_cl_insn * ip)
fix_loongson2f_jump (ip);
}
/* Fix loongson3 llsc errata: Insert sync before ll/lld. */
static bfd_boolean
has_label_name (const char *arr[], size_t len ,const char *s)
{
unsigned long i;
for (i = 0; i < len; i++)
{
if (!arr[i])
return FALSE;
if (streq (arr[i], s))
return TRUE;
}
return FALSE;
}
/* Fix loongson3 llsc errata: Insert sync before ll/lld. */
static void
fix_loongson3_llsc (struct mips_cl_insn * ip)
@ -6915,10 +6932,30 @@ fix_loongson3_llsc (struct mips_cl_insn * ip)
&& S_IS_LOCAL (seg_info (now_seg)->label_list->label)
&& (strcmp (ip->insn_mo->name, "sync") != 0))
{
const char *label_name = S_GET_NAME (seg_info (now_seg)->label_list->label);
unsigned long lookback = ARRAY_SIZE (history);
unsigned long i;
valueT label_value;
const char *label_names[MAX_LABELS_SAME];
const char *label_name;
label_name = S_GET_NAME (seg_info (now_seg)->label_list->label);
label_names[0] = label_name;
struct insn_label_list *llist = seg_info (now_seg)->label_list;
label_value = S_GET_VALUE (llist->label);
for (i = 1; i < MAX_LABELS_SAME; i++)
{
llist = llist->next;
if (!llist)
break;
if (S_GET_VALUE (llist->label) == label_value)
label_names[i] = S_GET_NAME (llist->label);
else
break;
}
for (; i < MAX_LABELS_SAME; i++)
label_names[i] = NULL;
unsigned long lookback = ARRAY_SIZE (history);
for (i = 0; i < lookback; i++)
{
if (streq (history[i].insn_mo->name, "ll")
@ -6938,7 +6975,9 @@ fix_loongson3_llsc (struct mips_cl_insn * ip)
if (delayed_branch_p (&history[j]))
{
if (streq (history[j].target, label_name))
if (has_label_name (label_names,
MAX_LABELS_SAME,
history[j].target))
{
add_fixed_insn (&sync_insn);
insert_into_history (0, 1, &sync_insn);
@ -6952,7 +6991,7 @@ fix_loongson3_llsc (struct mips_cl_insn * ip)
}
/* If we find a sc, we look forward to look for an branch insn,
and see whether it jump back and out of ll/sc. */
else if (streq(ip->insn_mo->name, "sc") || streq(ip->insn_mo->name, "scd"))
else if (streq (ip->insn_mo->name, "sc") || streq (ip->insn_mo->name, "scd"))
{
unsigned long lookback = ARRAY_SIZE (history) - 1;
unsigned long i;