target/hppa: fix TLB handling for page 0
Assume the following sequence: pitlbe r0(sr0,r0) iitlba r4,(sr0,r0) ldil L%3000000,r5 iitlbp r5,(sr0,r0) This will purge the whole TLB and add an entry for page 0. However the current TLB implementation in helper_iitlba() will store to the last empty TLB entry, while helper_iitlbp() will write to the first empty entry. That is because an empty entry will match address 0 in helper_iitlba() Signed-off-by: Sven Schnelle <svens@stackframe.org> Message-Id: <20190311191602.25796-3-svens@stackframe.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
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@ -242,13 +242,15 @@ void HELPER(itlba)(CPUHPPAState *env, target_ulong addr, target_ureg reg)
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/* Zap any old entries covering ADDR; notice empty entries on the way. */
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for (i = 0; i < ARRAY_SIZE(env->tlb); ++i) {
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hppa_tlb_entry *ent = &env->tlb[i];
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if (!ent->entry_valid) {
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empty = ent;
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} else if (ent->va_b <= addr && addr <= ent->va_e) {
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if (ent->va_b <= addr && addr <= ent->va_e) {
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if (ent->entry_valid) {
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hppa_flush_tlb_ent(env, ent);
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}
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if (!empty) {
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empty = ent;
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}
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}
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}
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/* If we didn't see an empty entry, evict one. */
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if (empty == NULL) {
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