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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/include | |
| parent | 5e01dc7b26d9f24f39abace5da98ccbd6a5ceb52 (diff) | |
| download | op-kernel-dev-61dbbaeb86c2181c79efae2d186193e0f8008af1.zip op-kernel-dev-61dbbaeb86c2181c79efae2d186193e0f8008af1.tar.gz | |
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/include')
| -rw-r--r-- | arch/parisc/include/asm/assembly.h | 12 | ||||
| -rw-r--r-- | arch/parisc/include/asm/uaccess.h | 7 |
2 files changed, 16 insertions, 3 deletions
diff --git a/arch/parisc/include/asm/assembly.h b/arch/parisc/include/asm/assembly.h index 0da8482..b3069fd 100644 --- a/arch/parisc/include/asm/assembly.h +++ b/arch/parisc/include/asm/assembly.h @@ -515,5 +515,17 @@ nop /* 7 */ .endm + /* + * ASM_EXCEPTIONTABLE_ENTRY + * + * Creates an exception table entry. + * Do not convert to a assembler macro. This won't work. + */ +#define ASM_EXCEPTIONTABLE_ENTRY(fault_addr, except_addr) \ + .section __ex_table,"aw" ! \ + ASM_ULONG_INSN fault_addr, except_addr ! \ + .previous + + #endif /* __ASSEMBLY__ */ #endif diff --git a/arch/parisc/include/asm/uaccess.h b/arch/parisc/include/asm/uaccess.h index e0a8235..4006964 100644 --- a/arch/parisc/include/asm/uaccess.h +++ b/arch/parisc/include/asm/uaccess.h @@ -59,12 +59,13 @@ static inline long access_ok(int type, const void __user * addr, /* * The exception table contains two values: the first is an address * for an instruction that is allowed to fault, and the second is - * the address to the fixup routine. + * the address to the fixup routine. Even on a 64bit kernel we could + * use a 32bit (unsigned int) address here. */ struct exception_table_entry { - unsigned long insn; /* address of insn that is allowed to fault. */ - long fixup; /* fixup routine */ + unsigned long insn; /* address of insn that is allowed to fault. */ + unsigned long fixup; /* fixup routine */ }; #define ASM_EXCEPTIONTABLE_ENTRY( fault_addr, except_addr )\ |
