From 82e089308bd9a7794a45f0fa3973d7659420fbd8 Mon Sep 17 00:00:00 2001 From: Andy Polyakov Date: Fri, 9 Dec 2016 15:26:19 +0100 Subject: [PATCH] perlasm/x86_64-xlate.pl: refine sign extension in ea package. $1<<32>>32 worked fine with either 32- or 64-bit perl for a good while, relying on quirk that [pure] 32-bit perl performed it as $1<<0>>0. But this apparently changed in some version past minimally required 5.10, and operation result became 0. Yet, it went unnoticed for another while, because most perl package providers configure their packages with -Duse64bitint option. Reviewed-by: Rich Salz --- crypto/perlasm/x86_64-xlate.pl | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/crypto/perlasm/x86_64-xlate.pl b/crypto/perlasm/x86_64-xlate.pl index f615fffbcd..4298b3f418 100755 --- a/crypto/perlasm/x86_64-xlate.pl +++ b/crypto/perlasm/x86_64-xlate.pl @@ -262,11 +262,18 @@ my %globals; $self->{base} =~ s/^[er](.?[0-9xpi])[d]?$/r\1/; # Solaris /usr/ccs/bin/as can't handle multiplications - # in $self->{label}, new gas requires sign extension... + # in $self->{label}... use integer; $self->{label} =~ s/(?{label} =~ s/\b([0-9]+\s*[\*\/\%]\s*[0-9]+)\b/eval($1)/eg; - $self->{label} =~ s/\b([0-9]+)\b/$1<<32>>32/eg; + + # Some assemblers insist on signed presentation of 32-bit + # offsets, but sign extension is a tricky business in perl... + if ((1<<31)<<1) { + $self->{label} =~ s/\b([0-9]+)\b/$1<<32>>32/eg; + } else { + $self->{label} =~ s/\b([0-9]+)\b/$1>>0/eg; + } if (!$self->{label} && $self->{index} && $self->{scale}==1 && $self->{base} =~ /(rbp|r13)/) { -- 2.25.1