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target/mips: fix TLB huge page check to use 64-bit shift

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Use extract64(entry, psn, 1) instead of (entry & (1 << psn)) to avoid
undefined behavior for shifts by 32–63 and to make bit extraction intent explicit.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Signed-off-by: Denis Rastyogin <gerben@altlinux.org>
Message-ID: <20250814104914.13101-1-gerben@altlinux.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
This commit is contained in:
Denis Rastyogin
2025-09-02 17:57:05 +02:00
committed by Philippe Mathieu-Daudé
parent 51c3aebfda
commit 1f82ca7234
1 changed files with 1 additions and 1 deletions
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target/mips/tcg/system/tlb_helper.c
+1 -1
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@@ -652,7 +652,7 @@ static int walk_directory(CPUMIPSState *env, uint64_t *vaddr,
return 0;
}
if ((entry & (1 << psn)) && hugepg) {
if (extract64(entry, psn, 1) && hugepg) {
*huge_page = true;
*hgpg_directory_hit = true;
entry = get_tlb_entry_layout(env, entry, leaf_mop, pf_ptew);