A branch instruction in thumb mode might either be narrow or
wide, depending on the offset to the branch location.
armasm seems to have a bug when calculating the difference
between two symbols, where there's such a branch inbetween.
If the branch immediately seems to require a wide instruction,
the symbol difference is calculated properly, but if the
branch is made wide as a consequence from another branch
being made wide, the symbol difference isn't calculated
properly.
---
gas-preprocessor.pl | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/gas-preprocessor.pl b/gas-preprocessor.pl
index 42e1c7f..16e91ab 100755
--- a/gas-preprocessor.pl
+++ b/gas-preprocessor.pl
@@ -837,15 +837,18 @@ sub handle_serialized_line {
# Check branch instructions
- if ($line =~ /(?:^|\n)\s*((\w+\s*:\s*)?bl?x?(..)?(?:\.w)?)\s+(\w+)/) {
+ if ($line =~ /(?:^|\n)\s*(\w+\s*:\s*)?(bl?x?(..)?(\.w)?)\s+(\w+)/) {
+ my $instr = $2;
my $cond = $3;
- my $target = $4;
+ my $width = $4;
+ my $target = $5;
# Don't interpret e.g. bic as b<cc> with ic as conditional code
if ($cond !~ /|$arm_cond_codes/) {
# Not actually a branch
} elsif ($target =~ /(\d+)([bf])/) {
# The target is a local label
$line = handle_local_label($line, $1, $2);
+ $line =~ s/\b$instr\b/$&.w/ if $width eq "";
} elsif (!is_register($target)) {
$call_targets{$target}++;
}
--
1.8.5.2 (Apple Git-48)
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