diff mbox series

[PULL,15/30] target/arm: Don't shift attrs in get_phys_addr_lpae

Message ID 20221025163952.4131046-16-peter.maydell@linaro.org
State Accepted
Commit 4566609176f82a8033d422bc6c04fc9c354bed24
Headers show
Series [PULL,01/30] target/arm: Implement FEAT_E0PD | expand

Commit Message

Peter Maydell Oct. 25, 2022, 4:39 p.m. UTC 
From: Richard Henderson <richard.henderson@linaro.org>

Leave the upper and lower attributes in the place they originate
from in the descriptor.  Shifting them around is confusing, since
one cannot read the bit numbers out of the manual.  Also, new
attributes have been added which would alter the shifts.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-id: 20221024051851.3074715-10-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target/arm/ptw.c | 31 +++++++++++++++----------------
 1 file changed, 15 insertions(+), 16 deletions(-)
diff mbox series

Patch

diff --git a/target/arm/ptw.c b/target/arm/ptw.c
index 3302376e42e..691110f70c0 100644
--- a/target/arm/ptw.c
+++ b/target/arm/ptw.c
@@ -1050,7 +1050,7 @@  static bool get_phys_addr_lpae(CPUARMState *env, S1Translate *ptw,
     hwaddr descaddr, indexmask, indexmask_grainsize;
     uint32_t tableattrs;
     target_ulong page_size;
-    uint32_t attrs;
+    uint64_t attrs;
     int32_t stride;
     int addrsize, inputsize, outputsize;
     uint64_t tcr = regime_tcr(env, mmu_idx);
@@ -1324,49 +1324,48 @@  static bool get_phys_addr_lpae(CPUARMState *env, S1Translate *ptw,
     descaddr &= ~(hwaddr)(page_size - 1);
     descaddr |= (address & (page_size - 1));
     /* Extract attributes from the descriptor */
-    attrs = extract64(descriptor, 2, 10)
-        | (extract64(descriptor, 52, 12) << 10);
+    attrs = descriptor & (MAKE_64BIT_MASK(2, 10) | MAKE_64BIT_MASK(52, 12));
 
     if (regime_is_stage2(mmu_idx)) {
         /* Stage 2 table descriptors do not include any attribute fields */
         goto skip_attrs;
     }
     /* Merge in attributes from table descriptors */
-    attrs |= nstable << 3; /* NS */
+    attrs |= nstable << 5; /* NS */
     guarded = extract64(descriptor, 50, 1);  /* GP */
     if (param.hpd) {
         /* HPD disables all the table attributes except NSTable.  */
         goto skip_attrs;
     }
-    attrs |= extract32(tableattrs, 0, 2) << 11;     /* XN, PXN */
+    attrs |= extract64(tableattrs, 0, 2) << 53;     /* XN, PXN */
     /*
      * The sense of AP[1] vs APTable[0] is reversed, as APTable[0] == 1
      * means "force PL1 access only", which means forcing AP[1] to 0.
      */
-    attrs &= ~(extract32(tableattrs, 2, 1) << 4);   /* !APT[0] => AP[1] */
-    attrs |= extract32(tableattrs, 3, 1) << 5;      /* APT[1] => AP[2] */
+    attrs &= ~(extract64(tableattrs, 2, 1) << 6);   /* !APT[0] => AP[1] */
+    attrs |= extract32(tableattrs, 3, 1) << 7;      /* APT[1] => AP[2] */
  skip_attrs:
 
     /*
      * Here descaddr is the final physical address, and attributes
      * are all in attrs.
      */
-    if ((attrs & (1 << 8)) == 0) {
+    if ((attrs & (1 << 10)) == 0) {
         /* Access flag */
         fi->type = ARMFault_AccessFlag;
         goto do_fault;
     }
 
-    ap = extract32(attrs, 4, 2);
+    ap = extract32(attrs, 6, 2);
 
     if (regime_is_stage2(mmu_idx)) {
         ns = mmu_idx == ARMMMUIdx_Stage2;
-        xn = extract32(attrs, 11, 2);
+        xn = extract64(attrs, 53, 2);
         result->f.prot = get_S2prot(env, ap, xn, s1_is_el0);
     } else {
-        ns = extract32(attrs, 3, 1);
-        xn = extract32(attrs, 12, 1);
-        pxn = extract32(attrs, 11, 1);
+        ns = extract32(attrs, 5, 1);
+        xn = extract64(attrs, 54, 1);
+        pxn = extract64(attrs, 53, 1);
         result->f.prot = get_S1prot(env, mmu_idx, aarch64, ap, ns, xn, pxn);
     }
 
@@ -1391,10 +1390,10 @@  static bool get_phys_addr_lpae(CPUARMState *env, S1Translate *ptw,
 
     if (regime_is_stage2(mmu_idx)) {
         result->cacheattrs.is_s2_format = true;
-        result->cacheattrs.attrs = extract32(attrs, 0, 4);
+        result->cacheattrs.attrs = extract32(attrs, 2, 4);
     } else {
         /* Index into MAIR registers for cache attributes */
-        uint8_t attrindx = extract32(attrs, 0, 3);
+        uint8_t attrindx = extract32(attrs, 2, 3);
         uint64_t mair = env->cp15.mair_el[regime_el(env, mmu_idx)];
         assert(attrindx <= 7);
         result->cacheattrs.is_s2_format = false;
@@ -1409,7 +1408,7 @@  static bool get_phys_addr_lpae(CPUARMState *env, S1Translate *ptw,
     if (param.ds) {
         result->cacheattrs.shareability = param.sh;
     } else {
-        result->cacheattrs.shareability = extract32(attrs, 6, 2);
+        result->cacheattrs.shareability = extract32(attrs, 8, 2);
     }
 
     result->f.phys_addr = descaddr;