diff options
author | Helge Deller <deller@gmx.de> | 2013-10-13 19:11:30 (GMT) |
---|---|---|
committer | Helge Deller <deller@gmx.de> | 2013-11-07 21:25:33 (GMT) |
commit | 61dbbaeb86c2181c79efae2d186193e0f8008af1 (patch) | |
tree | d12b369af162dcdb8835731b36da025158c8b616 /arch | |
parent | 5e01dc7b26d9f24f39abace5da98ccbd6a5ceb52 (diff) | |
download | linux-61dbbaeb86c2181c79efae2d186193e0f8008af1.tar.xz |
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')
-rw-r--r-- | arch/parisc/include/asm/assembly.h | 12 | ||||
-rw-r--r-- | arch/parisc/include/asm/uaccess.h | 7 | ||||
-rw-r--r-- | arch/parisc/kernel/syscall.S | 6 | ||||
-rw-r--r-- | arch/parisc/lib/lusercopy.S | 10 | ||||
-rw-r--r-- | arch/parisc/mm/fault.c | 6 |
5 files changed, 27 insertions, 14 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 )\ diff --git a/arch/parisc/kernel/syscall.S b/arch/parisc/kernel/syscall.S index e767ab7..a63bb179 100644 --- a/arch/parisc/kernel/syscall.S +++ b/arch/parisc/kernel/syscall.S @@ -649,10 +649,8 @@ cas_action: /* Two exception table entries, one for the load, the other for the store. Either return -EFAULT. Each of the entries must be relocated. */ - .section __ex_table,"aw" - ASM_ULONG_INSN (1b - linux_gateway_page), (3b - linux_gateway_page) - ASM_ULONG_INSN (2b - linux_gateway_page), (3b - linux_gateway_page) - .previous + ASM_EXCEPTIONTABLE_ENTRY(1b-linux_gateway_page, 3b-linux_gateway_page) + ASM_EXCEPTIONTABLE_ENTRY(2b-linux_gateway_page, 3b-linux_gateway_page) /* Make sure nothing else is placed on this page */ diff --git a/arch/parisc/lib/lusercopy.S b/arch/parisc/lib/lusercopy.S index 6f2d935..a512f07 100644 --- a/arch/parisc/lib/lusercopy.S +++ b/arch/parisc/lib/lusercopy.S @@ -88,9 +88,7 @@ ENDPROC(lclear_user) ldo 1(%r25),%r25 .previous - .section __ex_table,"aw" - ASM_ULONG_INSN 1b,2b - .previous + ASM_EXCEPTIONTABLE_ENTRY(1b,2b) .procend @@ -129,10 +127,8 @@ ENDPROC(lstrnlen_user) copy %r24,%r26 /* reset r26 so 0 is returned on fault */ .previous - .section __ex_table,"aw" - ASM_ULONG_INSN 1b,3b - ASM_ULONG_INSN 2b,3b - .previous + ASM_EXCEPTIONTABLE_ENTRY(1b,3b) + ASM_EXCEPTIONTABLE_ENTRY(2b,3b) .procend diff --git a/arch/parisc/mm/fault.c b/arch/parisc/mm/fault.c index 0293588..df0d329 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; |