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authorSUGIOKA Toshinobu <sugioka@itonet.co.jp>2009-01-21 09:42:10 +0900
committerPaul Mundt <lethal@linux-sh.org>2009-01-21 18:35:55 +0900
commit2afb447f33c29cb000a494396559f8005d3e33c1 (patch)
tree71365a7c84c6493f602cae0e6f249f26c26ae4ea /arch/sh
parenteb6434d9e79a72d35d68811efd68fe8bab8f5baf (diff)
sh: fix unaligned and nonexistent address handling
unaligned and nonexistent address causes wrong exception handling in traps_32.c(handle_unaligned_access). 'handle_unalinged_ins' should return -EFAULT if address error is fixed up with kernel exception table, otherwise 'handle_unaligned_access' increases already fixed program counter and then crash. for example ioctl(fd, TCGETA, (struct termio *)-1) never return and stay in TASK_UNINTERRUPTIBLE state forever in my kernel. Signed-off-by: SUGIOKA Toshinobu <sugioka@itonet.co.jp> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh')
-rw-r--r--arch/sh/kernel/traps_32.c9
1 files changed, 4 insertions, 5 deletions
diff --git a/arch/sh/kernel/traps_32.c b/arch/sh/kernel/traps_32.c
index c0aa3d83ec0..60dcf87ed01 100644
--- a/arch/sh/kernel/traps_32.c
+++ b/arch/sh/kernel/traps_32.c
@@ -125,20 +125,18 @@ static inline void die_if_kernel(const char *str, struct pt_regs *regs,
* - userspace errors just cause EFAULT to be returned, resulting in SEGV
* - kernel/userspace interfaces cause a jump to an appropriate handler
* - other kernel errors are bad
- * - return 0 if fixed-up, -EFAULT if non-fatal (to the kernel) fault
*/
-static int die_if_no_fixup(const char * str, struct pt_regs * regs, long err)
+static void die_if_no_fixup(const char * str, struct pt_regs * regs, long err)
{
if (!user_mode(regs)) {
const struct exception_table_entry *fixup;
fixup = search_exception_tables(regs->pc);
if (fixup) {
regs->pc = fixup->fixup;
- return 0;
+ return;
}
die(str, regs, err);
}
- return -EFAULT;
}
static inline void sign_extend(unsigned int count, unsigned char *dst)
@@ -314,7 +312,8 @@ static int handle_unaligned_ins(opcode_t instruction, struct pt_regs *regs,
/* Argh. Address not only misaligned but also non-existent.
* Raise an EFAULT and see if it's trapped
*/
- return die_if_no_fixup("Fault in unaligned fixup", regs, 0);
+ die_if_no_fixup("Fault in unaligned fixup", regs, 0);
+ return -EFAULT;
}
/*