diff options
Diffstat (limited to 'arch/arc/kernel/traps.c')
| -rw-r--r-- | arch/arc/kernel/traps.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/arch/arc/kernel/traps.c b/arch/arc/kernel/traps.c index c6396b4..ec802c5 100644 --- a/arch/arc/kernel/traps.c +++ b/arch/arc/kernel/traps.c @@ -7,6 +7,9 @@ * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * + * vineetg: May 2011 + * -user-space unaligned access emulation + * * Rahul Trivedi: Codito Technologies 2004 */ @@ -16,6 +19,7 @@ #include <asm/ptrace.h> #include <asm/setup.h> #include <asm/kprobes.h> +#include <asm/unaligned.h> void __init trap_init(void) { @@ -79,7 +83,29 @@ DO_ERROR_INFO(SIGILL, "Illegal Insn (or Seq)", insterror_is_error, ILL_ILLOPC) DO_ERROR_INFO(SIGBUS, "Invalid Mem Access", do_memory_error, BUS_ADRERR) DO_ERROR_INFO(SIGTRAP, "Breakpoint Set", trap_is_brkpt, TRAP_BRKPT) +#ifdef CONFIG_ARC_MISALIGN_ACCESS +/* + * Entry Point for Misaligned Data access Exception, for emulating in software + */ +int do_misaligned_access(unsigned long cause, unsigned long address, + struct pt_regs *regs, struct callee_regs *cregs) +{ + if (misaligned_fixup(address, regs, cause, cregs) != 0) { + siginfo_t info; + + info.si_signo = SIGBUS; + info.si_errno = 0; + info.si_code = BUS_ADRALN; + info.si_addr = (void __user *)address; + return handle_exception(cause, "Misaligned Access", regs, + &info); + } + return 0; +} + +#else DO_ERROR_INFO(SIGSEGV, "Misaligned Access", do_misaligned_access, SEGV_ACCERR) +#endif /* * Entry point for miscll errors such as Nested Exceptions |