parisc: provide macro to create exception table entries

Provide a macro ASM_EXCEPTIONTABLE_ENTRY() to create exception table
entries and convert all open-coded places to use that macro.

This patch is a first step toward creating a exception table which only
holds 32bit pointers even on a 64bit kernel. That way in my own kernel
I was able to reduce the in-kernel exception table from 44kB to 22kB.

Signed-off-by: Helge Deller <deller@gmx.de>

1 files changed, 6 insertions, 0 deletions

diff --git a/arch/parisc/mm/fault.c b/arch/parisc/mm/fault.c
index 0293588d5b8c..df0d32971cdf 100644
--- a/arch/parisc/mm/fault.c
+++ b/arch/parisc/mm/fault.c
@@ -142,6 +142,12 @@ int fixup_exception(struct pt_regs *regs)
 {
         const struct exception_table_entry *fix;
 
+        /* If we only stored 32bit addresses in the exception table we can drop
+         * out if we faulted on a 64bit address. */
+        if ((sizeof(regs->iaoq[0]) > sizeof(fix->insn))
+                && (regs->iaoq[0] >> 32))
+                        return 0;
+
         fix = search_exception_tables(regs->iaoq[0]);
         if (fix) {
                 struct exception_data *d;