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[Qemu-devel] [PULL 18/30] target-sparc: replace the last tlb entry when

From: Richard Henderson
Subject: [Qemu-devel] [PULL 18/30] target-sparc: replace the last tlb entry when no free entries left
Date: Wed, 11 Jan 2017 18:55:54 -0800

From: Artyom Tarasenko <address@hidden>

Implement the behavior described in the chapter 13.9.11 of
UltraSPARC T1™ Supplement to the UltraSPARC Architecture 2005:

"If a TLB Data-In replacement is attempted with all TLB
entries locked and valid, the last TLB entry (entry 63) is

Signed-off-by: Artyom Tarasenko <address@hidden>
Message-Id: <address@hidden>
Signed-off-by: Richard Henderson <address@hidden>
 target/sparc/ldst_helper.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/target/sparc/ldst_helper.c b/target/sparc/ldst_helper.c
index d524aaa..8cc8bb1 100644
--- a/target/sparc/ldst_helper.c
+++ b/target/sparc/ldst_helper.c
@@ -246,9 +246,11 @@ static void replace_tlb_1bit_lru(SparcTLBEntry *tlb,
 #ifdef DEBUG_MMU
-    DPRINTF_MMU("%s lru replacement failed: no entries available\n", strmmu);
+    DPRINTF_MMU("%s lru replacement: no free entries available, "
+                "replacing the last one\n", strmmu);
-    /* error state? */
+    /* corner case: the last entry is replaced anyway */
+    replace_tlb_entry(&tlb[63], tlb_tag, tlb_tte, env1);

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