[PATCH] scripts/checkstack.pl: automatically handle 32-bit and 64-bit mode for ARCH=x86

Konstantin Khlebnikov
2014-07-08T10:36:06Z

This patch adds support for ARCH=x86 into checkstack.

commit ffee0de ("x86: Default to ARCH=x86 to avoid overriding CONFIG_64BIT")
had merged ARCH=i386 and ARCH=x86_64 into one ARCH=x86. checkstack.pl searches
patterns of machine instructions which are usually used for allocating stack
frames. checkstalk.pl needs either i386 or x86_64, x86 isn't enough:

$ make checkstack
objdump -d vmlinux $(find . -name '*.ko') | \
perl linux/scripts/checkstack.pl x86
wrong or unknown architecture "x86"

Signed-off-by: Konstantin Khlebnikov <koct9i@gmail.com>
---
scripts/checkstack.pl | 12 +++++-------
1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/scripts/checkstack.pl b/scripts/checkstack.pl
index c05d586..899b423 100755
--- a/scripts/checkstack.pl
+++ b/scripts/checkstack.pl
@@ -52,14 +52,12 @@ my (@stack, $re, $dre, $x, $xs, $funcre);
#8000008a: 20 1d sub sp,4
#80000ca8: fa cd 05 b0 sub sp,sp,1456
$re = qr/^.*sub.*sp.*,([0-9]{1,8})/o;
- } elsif ($arch =~ /^i[3456]86$/) {
+ } elsif ($arch =~ /^x86(_64)?$/ || $arch =~ /^i[3456]86$/) {
#c0105234: 81 ec ac 05 00 00 sub $0x5ac,%esp
- $re = qr/^.*[as][du][db] \$(0x$x{1,8}),\%esp$/o;
- $dre = qr/^.*[as][du][db] (%.*),\%esp$/o;
- } elsif ($arch eq 'x86_64') {
- # 2f60: 48 81 ec e8 05 00 00 sub $0x5e8,%rsp
- $re = qr/^.*[as][du][db] \$(0x$x{1,8}),\%rsp$/o;
- $dre = qr/^.*[as][du][db] (\%.*),\%rsp$/o;
+ # or
+ # 2f60: 48 81 ec e8 05 00 00 sub $0x5e8,%rsp
+ $re = qr/^.*[as][du][db] \$(0x$x{1,8}),\%(e|r)sp$/o;
+ $dre = qr/^.*[as][du][db] (%.*),\%(e|r)sp$/o;
} elsif ($arch eq 'ia64') {
#e0000000044011fc: 01 0f fc 8c adds r12=-384,r12
$re = qr/.*adds.*r12=-(([0-9]{2}|[3-9])[0-9]{2}),r12/o;