X-Git-Url: http://git.rot13.org/?a=blobdiff_plain;f=arch%2Fsparc64%2Fkernel%2Funaligned.c;h=bc18d480dd1cb958fe4010acef75aa8e8a43a766;hb=7e20ef030dde0e52dd5a57220ee82fa9facbea4e;hp=001e8518331fb91bf56a28d2770e9cfef68769f0;hpb=ba93c6297b9cfad5a70b5e5ed13c9dbead6601d3;p=powerpc.git

diff --git a/arch/sparc64/kernel/unaligned.c b/arch/sparc64/kernel/unaligned.c
index 001e851833..bc18d480dd 100644
--- a/arch/sparc64/kernel/unaligned.c
+++ b/arch/sparc64/kernel/unaligned.c
@@ -20,6 +20,7 @@
 #include <linux/smp.h>
 #include <linux/smp_lock.h>
 #include <linux/bitops.h>
+#include <linux/kallsyms.h>
 #include <asm/fpumacro.h>
 
 /* #define DEBUG_MNA */
@@ -242,7 +243,7 @@ static inline int ok_for_kernel(unsigned int insn)
 	return !floating_point_load_or_store_p(insn);
 }
 
-static void kernel_mna_trap_fault(void)
+static void kernel_mna_trap_fault(int fixup_tstate_asi)
 {
 	struct pt_regs *regs = current_thread_info()->kern_una_regs;
 	unsigned int insn = current_thread_info()->kern_una_insn;
@@ -273,28 +274,57 @@ static void kernel_mna_trap_fault(void)
 	regs->tpc = entry->fixup;
 	regs->tnpc = regs->tpc + 4;
 
-	regs->tstate &= ~TSTATE_ASI;
-	regs->tstate |= (ASI_AIUS << 24UL);
+	if (fixup_tstate_asi) {
+		regs->tstate &= ~TSTATE_ASI;
+		regs->tstate |= (ASI_AIUS << 24UL);
+	}
+}
+
+static void log_unaligned(struct pt_regs *regs)
+{
+	static unsigned long count, last_time;
+
+	if (jiffies - last_time > 5 * HZ)
+		count = 0;
+	if (count < 5) {
+		last_time = jiffies;
+		count++;
+		printk("Kernel unaligned access at TPC[%lx] ", regs->tpc);
+		print_symbol("%s\n", regs->tpc);
+	}
 }
 
 asmlinkage void kernel_unaligned_trap(struct pt_regs *regs, unsigned int insn)
 {
 	enum direction dir = decode_direction(insn);
 	int size = decode_access_size(insn);
+	int orig_asi, asi;
 
 	current_thread_info()->kern_una_regs = regs;
 	current_thread_info()->kern_una_insn = insn;
 
+	orig_asi = asi = decode_asi(insn, regs);
+
+	/* If this is a {get,put}_user() on an unaligned userspace pointer,
+	 * just signal a fault and do not log the event.
+	 */
+	if (asi == ASI_AIUS) {
+		kernel_mna_trap_fault(0);
+		return;
+	}
+
+	log_unaligned(regs);
+
 	if (!ok_for_kernel(insn) || dir == both) {
 		printk("Unsupported unaligned load/store trap for kernel "
 		       "at <%016lx>.\n", regs->tpc);
 		unaligned_panic("Kernel does fpu/atomic "
 				"unaligned load/store.", regs);
 
-		kernel_mna_trap_fault();
+		kernel_mna_trap_fault(0);
 	} else {
 		unsigned long addr, *reg_addr;
-		int orig_asi, asi, err;
+		int err;
 
 		addr = compute_effective_address(regs, insn,
 						 ((insn >> 25) & 0x1f));
@@ -304,7 +334,6 @@ asmlinkage void kernel_unaligned_trap(struct pt_regs *regs, unsigned int insn)
 		       regs->tpc, dirstrings[dir], addr, size,
 		       regs->u_regs[UREG_RETPC]);
 #endif
-		orig_asi = asi = decode_asi(insn, regs);
 		switch (asi) {
 		case ASI_NL:
 		case ASI_AIUPL:
@@ -354,7 +383,7 @@ asmlinkage void kernel_unaligned_trap(struct pt_regs *regs, unsigned int insn)
 			/* Not reached... */
 		}
 		if (unlikely(err))
-			kernel_mna_trap_fault();
+			kernel_mna_trap_fault(1);
 		else
 			advance(regs);
 	}