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scripts/checkstack.pl: support llvm-objdump disassembly for x86

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When running `make LLVM=1 checkstack`, OBJDUMP is set to llvm-objdump. 
llvm-objdump outputs disassembly with instruction size suffixes (such as
subq/addq/subl/addl), tabs/whitespace differences, spaces after commas,
and trailing comments (e.g.  `# imm = 0x...`).

Because scripts/checkstack.pl used rigid regular expressions specifically
tuned to GNU objdump format (e.g.  requiring exactly four spaces, no
suffix, and no space after comma), checkstack.pl failed to match any stack
adjustment instructions and yielded no output when using llvm-objdump on
x86.

Update the regular expressions for x86 to match optional suffixes,
variable whitespace, and trailing comments.

Link: https://lore.kernel.org/20260902-checkstack_llvm_objdump-v1-1-edb4eca5f163@google.com
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Assisted-by: LLM Gemini
Cc: Bill Wendling <morbo@google.com>
Cc: Justin Stitt <justinstitt@google.com>
Cc: Nathan Chancellor <nathan@kernel.org>
This commit is contained in:
Nick Desaulniers 2026-09-02 14:01:53 -07:00 committed by Andrew Morton
parent 033abd1e9b
commit 4975fb231f
1 changed files with 4 additions and 2 deletions
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6
scripts/checkstack.pl
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@ -66,8 +66,10 @@ my (@stack, $re, $dre, $sub, $x, $xs, $funcre, $min_stack);
#c0105234: 81 ec ac 05 00 00 sub $0x5ac,%esp
# 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;
# or
# 0: 48 81 ec e8 05 00 00 subq $0x5e8, %rsp
$re = qr/^.*[as][du][db][ql]?\s+\$(0x$x{1,8}),\s*\%(e|r)sp/o;
$dre = qr/^.*[as][du][db][ql]?\s+(%.*),\s*\%(e|r)sp/o;
} elsif ($arch eq 'm68k') {
# 2b6c: 4e56 fb70 linkw %fp,#-1168
# 1df770: defc ffe4 addaw #-28,%sp