From: SUGIOKA Toshinobu Date: Wed, 21 Jan 2009 00:42:10 +0000 (+0900) Subject: sh: fix unaligned and nonexistent address handling X-Git-Tag: MMI-PSA29.97-13-9~29764^2~2 X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=2afb447f33c29cb000a494396559f8005d3e33c1;p=GitHub%2FMotorolaMobilityLLC%2Fkernel-slsi.git 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 Signed-off-by: Paul Mundt --- diff --git a/arch/sh/kernel/traps_32.c b/arch/sh/kernel/traps_32.c index c0aa3d83ec0e..60dcf87ed019 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; } /*