Merge tag 'kvm-arm-for-3.17' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm...

[karo-tx-linux.git] / arch / arm64 / kernel / debug-monitors.c

diff --git a/arch/arm64/kernel/debug-monitors.c b/arch/arm64/kernel/debug-monitors.c
index a7fb874b595edc0c095430792de9c8883590855f..b056369fd47da0b4cfa6900e61474cf07fc06ea7 100644 (file)
--- a/arch/arm64/kernel/debug-monitors.c
+++ b/arch/arm64/kernel/debug-monitors.c
@@ -30,15 +30,6 @@
 #include <asm/cputype.h>
 #include <asm/system_misc.h>
 
-/* Low-level stepping controls. */
-#define DBG_MDSCR_SS           (1 << 0)
-#define DBG_SPSR_SS            (1 << 21)
-
-/* MDSCR_EL1 enabling bits */
-#define DBG_MDSCR_KDE          (1 << 13)
-#define DBG_MDSCR_MDE          (1 << 15)
-#define DBG_MDSCR_MASK         ~(DBG_MDSCR_KDE | DBG_MDSCR_MDE)
-
 /* Determine debug architecture. */
 u8 debug_monitors_arch(void)
 {
@@ -315,20 +306,20 @@ static int brk_handler(unsigned long addr, unsigned int esr,
 {
        siginfo_t info;
 
-       if (call_break_hook(regs, esr) == DBG_HOOK_HANDLED)
-               return 0;
+       if (user_mode(regs)) {
+               info = (siginfo_t) {
+                       .si_signo = SIGTRAP,
+                       .si_errno = 0,
+                       .si_code  = TRAP_BRKPT,
+                       .si_addr  = (void __user *)instruction_pointer(regs),
+               };
 
-       if (!user_mode(regs))
+               force_sig_info(SIGTRAP, &info, current);
+       } else if (call_break_hook(regs, esr) != DBG_HOOK_HANDLED) {
+               pr_warning("Unexpected kernel BRK exception at EL1\n");
                return -EFAULT;
+       }
 
-       info = (siginfo_t) {
-               .si_signo = SIGTRAP,
-               .si_errno = 0,
-               .si_code  = TRAP_BRKPT,
-               .si_addr  = (void __user *)instruction_pointer(regs),
-       };
-
-       force_sig_info(SIGTRAP, &info, current);
        return 0;
 }