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| author | Helge Deller <deller@gmx.de> | 2013-10-13 21:11:30 +0200 |
|---|---|---|
| committer | Helge Deller <deller@gmx.de> | 2013-11-07 22:25:33 +0100 |
| commit | 61dbbaeb86c2181c79efae2d186193e0f8008af1 (patch) | |
| tree | d12b369af162dcdb8835731b36da025158c8b616 /arch/parisc/mm/fault.c | |
| parent | 5e01dc7b26d9f24f39abace5da98ccbd6a5ceb52 (diff) | |
| download | linux-61dbbaeb86c2181c79efae2d186193e0f8008af1.tar.bz2 | |
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>
Diffstat (limited to 'arch/parisc/mm/fault.c')
| -rw-r--r-- | arch/parisc/mm/fault.c | 6 |
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; |