[Qemu-devel] [PATCH 7/8] PPC: booke206: Check for min/max TLB entry size

[Alexander Graf]

When setting a TLB entry, we need to check if the TLB we're putting it in
actually supports the given size. According to the 2.06 PowerPC ISA, a
value that's out of range can either be redefined to something implementation
dependent or we can raise an illegal opcode exception. We do the latter.

Signed-off-by: Alexander Graf <address@hidden>

---

v1 -> v2:

  - fix min/max check
  - use mav 2.0 prepared code
  - raise exception on invalid page size
---
 target-ppc/op_helper.c |   11 +++++++++++
 1 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/target-ppc/op_helper.c b/target-ppc/op_helper.c
index 6339c95..2c8a96f 100644
--- a/target-ppc/op_helper.c
+++ b/target-ppc/op_helper.c
@@ -4228,6 +4228,7 @@ void helper_booke206_tlbwe(void)
 {
     uint32_t tlbncfg, tlbn;
     ppcmas_tlb_t *tlb;
+    uint32_t size_tlb, size_ps;
 
     switch (env->spr[SPR_BOOKE_MAS0] & MAS0_WQ_MASK) {
     case MAS0_WQ_ALWAYS:
@@ -4273,6 +4274,16 @@ void helper_booke206_tlbwe(void)
         tlb->mas1 &= ~MAS1_IPROT;
     }
 
+    /* check that we support the targeted size */
+    size_tlb = (tlb->mas1 & MAS1_TSIZE_MASK) >> MAS1_TSIZE_SHIFT;
+    size_ps = booke206_tlbnps(env, tlbn);
+    if ((tlb->mas1 & MAS1_VALID) && (tlbncfg & TLBnCFG_AVAIL) &&
+        !(size_ps & (1 << size_tlb))) {
+        helper_raise_exception_err(POWERPC_EXCP_PROGRAM,
+                                   POWERPC_EXCP_INVAL |
+                                   POWERPC_EXCP_INVAL_INVAL);
+    }
+
     if (booke206_tlb_to_page_size(env, tlb) == TARGET_PAGE_SIZE) {
         tlb_flush_page(env, tlb->mas2 & MAS2_EPN_MASK);
     } else {
-- 
1.6.0.2