Changeset 925be4e in mainline for kernel/arch/ia64

Timestamp:

2009-07-07T21:12:54Z (16 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

1f0db02e

Parents:

80a3bd9

Message:

The ia64 kernel needs to handle the Data Access Rights fault.

Location:

kernel/arch/ia64

Files:

• include/mm/tlb.h (modified) (1 diff)
• src/ivt.S (modified) (1 diff)
• src/mm/tlb.c (modified) (1 diff)

kernel/arch/ia64/include/mm/tlb.h

@@ -93 +93 @@
 extern void instruction_access_bit_fault(uint64_t vector, istate_t *istate);
 extern void data_access_bit_fault(uint64_t vector, istate_t *istate);
+extern void data_access_rights_fault(uint64_t vector, istate_t *istate);
 extern void page_not_present(uint64_t vector, istate_t *istate);
 

kernel/arch/ia64/src/ivt.S

@@ -537 +537 @@
         HEAVYWEIGHT_HANDLER 0x5100
         HEAVYWEIGHT_HANDLER 0x5200
-        HEAVYWEIGHT_HANDLER 0x5300
+        HEAVYWEIGHT_HANDLER 0x5300 data_access_rights_fault
         HEAVYWEIGHT_HANDLER 0x5400 general_exception
         HEAVYWEIGHT_HANDLER 0x5500 disabled_fp_register

kernel/arch/ia64/src/mm/tlb.c

@@ -711 +711 @@
 }
 
+/** Data access rights fault handler.
+ *
+ * @param vector Interruption vector.
+ * @param istate Structure with saved interruption state.
+ */
+void data_access_rights_fault(uint64_t vector, istate_t *istate)
+{
+        region_register rr;
+        rid_t rid;
+        uintptr_t va;
+        pte_t *t;
+
+        va = istate->cr_ifa;    /* faulting address */
+        rr.word = rr_read(VA2VRN(va));
+        rid = rr.map.rid;
+
+        /*
+         * Assume a write to a read-only page.
+         */
+        page_table_lock(AS, true);
+        t = page_mapping_find(AS, va);
+        ASSERT(t && t->p);
+        ASSERT(!t->w);
+        if (as_page_fault(va, PF_ACCESS_WRITE, istate) == AS_PF_FAULT) {
+                fault_if_from_uspace(istate, "Page fault at %p.", va);
+                panic("%s: va=%p, rid=%d, iip=%p.", __func__, va, rid,
+                    istate->cr_iip);
+        }
+        page_table_unlock(AS, true);
+}
+
 /** Page not present fault handler.
  *