7 files changed, 54 insertions, 28 deletions

diff --git a/arch/sparc/mm/fault_64.c b/arch/sparc/mm/fault_64.c
index a9e474b..4ab8993 100644
--- a/arch/sparc/mm/fault_64.c
+++ b/arch/sparc/mm/fault_64.c
@@ -19,6 +19,7 @@
 #include <linux/interrupt.h>
 #include <linux/kprobes.h>
 #include <linux/kdebug.h>
+#include <linux/percpu.h>
 
 #include <asm/page.h>
 #include <asm/pgtable.h>
@@ -224,6 +225,30 @@ cannot_handle:
 	unhandled_fault (address, current, regs);
 }
 
+static void noinline bogus_32bit_fault_tpc(struct pt_regs *regs)
+{
+	static int times;
+
+	if (times++ < 10)
+		printk(KERN_ERR "FAULT[%s:%d]: 32-bit process reports "
+		       "64-bit TPC [%lx]\n",
+		       current->comm, current->pid,
+		       regs->tpc);
+	show_regs(regs);
+}
+
+static void noinline bogus_32bit_fault_address(struct pt_regs *regs,
+					       unsigned long addr)
+{
+	static int times;
+
+	if (times++ < 10)
+		printk(KERN_ERR "FAULT[%s:%d]: 32-bit process "
+		       "reports 64-bit fault address [%lx]\n",
+		       current->comm, current->pid, addr);
+	show_regs(regs);
+}
+
 asmlinkage void __kprobes do_sparc64_fault(struct pt_regs *regs)
 {
 	struct mm_struct *mm = current->mm;
@@ -244,6 +269,19 @@ asmlinkage void __kprobes do_sparc64_fault(struct pt_regs *regs)
 	    (fault_code & FAULT_CODE_DTLB))
 		BUG();
 
+	if (test_thread_flag(TIF_32BIT)) {
+		if (!(regs->tstate & TSTATE_PRIV)) {
+			if (unlikely((regs->tpc >> 32) != 0)) {
+				bogus_32bit_fault_tpc(regs);
+				goto intr_or_no_mm;
+			}
+		}
+		if (unlikely((address >> 32) != 0)) {
+			bogus_32bit_fault_address(regs, address);
+			goto intr_or_no_mm;
+		}
+	}
+
 	if (regs->tstate & TSTATE_PRIV) {
 		unsigned long tpc = regs->tpc;
 
@@ -264,12 +302,6 @@ asmlinkage void __kprobes do_sparc64_fault(struct pt_regs *regs)
 	if (in_atomic() || !mm)
 		goto intr_or_no_mm;
 
-	if (test_thread_flag(TIF_32BIT)) {
-		if (!(regs->tstate & TSTATE_PRIV))
-			regs->tpc &= 0xffffffff;
-		address &= 0xffffffff;
-	}
-
 	if (!down_read_trylock(&mm->mmap_sem)) {
 		if ((regs->tstate & TSTATE_PRIV) &&
 		    !search_exception_tables(regs->tpc)) {
diff --git a/arch/sparc/mm/generic_32.c b/arch/sparc/mm/generic_32.c
index a289261..5edcac1 100644
--- a/arch/sparc/mm/generic_32.c
+++ b/arch/sparc/mm/generic_32.c
@@ -95,3 +95,4 @@ int io_remap_pfn_range(struct vm_area_struct *vma, unsigned long from,
 	flush_tlb_range(vma, beg, end);
 	return error;
 }
+EXPORT_SYMBOL(io_remap_pfn_range);
diff --git a/arch/sparc/mm/generic_64.c b/arch/sparc/mm/generic_64.c
index f362c20..04f2bf4 100644
--- a/arch/sparc/mm/generic_64.c
+++ b/arch/sparc/mm/generic_64.c
@@ -161,3 +161,4 @@ int io_remap_pfn_range(struct vm_area_struct *vma, unsigned long from,
 	flush_tlb_range(vma, beg, end);
 	return error;
 }
+EXPORT_SYMBOL(io_remap_pfn_range);
diff --git a/arch/sparc/mm/highmem.c b/arch/sparc/mm/highmem.c
index 01fc6c2..752d0c9 100644
--- a/arch/sparc/mm/highmem.c
+++ b/arch/sparc/mm/highmem.c
@@ -62,6 +62,7 @@ void *kmap_atomic(struct page *page, enum km_type type)
 
 	return (void*) vaddr;
 }
+EXPORT_SYMBOL(kmap_atomic);
 
 void kunmap_atomic(void *kvaddr, enum km_type type)
 {
@@ -98,6 +99,7 @@ void kunmap_atomic(void *kvaddr, enum km_type type)
 
 	pagefault_enable();
 }
+EXPORT_SYMBOL(kunmap_atomic);
 
 /* We may be fed a pagetable here by ptep_to_xxx and others. */
 struct page *kmap_atomic_to_page(void *ptr)
diff --git a/arch/sparc/mm/init_32.c b/arch/sparc/mm/init_32.c
index fec9260..cbb282d 100644
--- a/arch/sparc/mm/init_32.c
+++ b/arch/sparc/mm/init_32.c
@@ -38,11 +38,16 @@
 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
 
 unsigned long *sparc_valid_addr_bitmap;
+EXPORT_SYMBOL(sparc_valid_addr_bitmap);
 
 unsigned long phys_base;
+EXPORT_SYMBOL(phys_base);
+
 unsigned long pfn_base;
+EXPORT_SYMBOL(pfn_base);
 
 unsigned long page_kernel;
+EXPORT_SYMBOL(page_kernel);
 
 struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1];
 unsigned long sparc_unmapped_base;
@@ -522,3 +527,4 @@ void sparc_flush_page_to_ram(struct page *page)
 	if (vaddr)
 		__flush_page_to_ram(vaddr);
 }
+EXPORT_SYMBOL(sparc_flush_page_to_ram);
diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c
index c77c7ef..00373ce 100644
--- a/arch/sparc/mm/init_64.c
+++ b/arch/sparc/mm/init_64.c
@@ -146,6 +146,7 @@ static void __init read_obp_memory(const char *property,
 }
 
 unsigned long *sparc64_valid_addr_bitmap __read_mostly;
+EXPORT_SYMBOL(sparc64_valid_addr_bitmap);
 
 /* Kernel physical address base and size in bytes.  */
 unsigned long kern_base __read_mostly;
@@ -369,6 +370,7 @@ void flush_dcache_page(struct page *page)
 out:
 	put_cpu();
 }
+EXPORT_SYMBOL(flush_dcache_page);
 
 void __kprobes flush_icache_range(unsigned long start, unsigned long end)
 {
@@ -396,6 +398,7 @@ void __kprobes flush_icache_range(unsigned long start, unsigned long end)
 		}
 	}
 }
+EXPORT_SYMBOL(flush_icache_range);
 
 void mmu_info(struct seq_file *m)
 {
@@ -599,6 +602,7 @@ void __flush_dcache_range(unsigned long start, unsigned long end)
 					       "i" (ASI_DCACHE_INVALIDATE));
 	}
 }
+EXPORT_SYMBOL(__flush_dcache_range);
 
 /* get_new_mmu_context() uses "cache + 1".  */
 DEFINE_SPINLOCK(ctx_alloc_lock);
diff --git a/arch/sparc/mm/ultra.S b/arch/sparc/mm/ultra.S
index 80c788e..b57a594 100644
--- a/arch/sparc/mm/ultra.S
+++ b/arch/sparc/mm/ultra.S
@@ -679,28 +679,8 @@ xcall_new_mmu_context_version:
 #ifdef CONFIG_KGDB
 	.globl		xcall_kgdb_capture
 xcall_kgdb_capture:
-661:	rdpr		%pstate, %g2
-	wrpr		%g2, PSTATE_IG | PSTATE_AG, %pstate
-	.section	.sun4v_2insn_patch, "ax"
-	.word		661b
-	nop
-	nop
-	.previous
-
-	rdpr		%pil, %g2
-	wrpr		%g0, PIL_NORMAL_MAX, %pil
-	sethi		%hi(109f), %g7
-	ba,pt		%xcc, etrap_irq
-109:	 or		%g7, %lo(109b), %g7
-#ifdef CONFIG_TRACE_IRQFLAGS
-	call		trace_hardirqs_off
-	 nop
-#endif
-	call		smp_kgdb_capture_client
-	 add		%sp, PTREGS_OFF, %o0
-	/* Has to be a non-v9 branch due to the large distance. */
-	ba		rtrap_xcall
-	 ldx		[%sp + PTREGS_OFF + PT_V9_TSTATE], %l1
+	wr		%g0, (1 << PIL_KGDB_CAPTURE), %set_softint
+	retry
 #endif
 
 #endif /* CONFIG_SMP */