1 files changed, 113 insertions, 65 deletions

diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index 6f0ae1a9bfae..29d128eb6c43 100644
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -21,7 +21,6 @@
 #include <linux/stddef.h>
 #include <linux/unistd.h>
 #include <linux/ptrace.h>
-#include <linux/slab.h>
 #include <linux/user.h>
 #include <linux/interrupt.h>
 #include <linux/init.h>
@@ -60,13 +59,13 @@
 #endif
 
 #if defined(CONFIG_DEBUGGER) || defined(CONFIG_KEXEC)
-int (*__debugger)(struct pt_regs *regs);
-int (*__debugger_ipi)(struct pt_regs *regs);
-int (*__debugger_bpt)(struct pt_regs *regs);
-int (*__debugger_sstep)(struct pt_regs *regs);
-int (*__debugger_iabr_match)(struct pt_regs *regs);
-int (*__debugger_dabr_match)(struct pt_regs *regs);
-int (*__debugger_fault_handler)(struct pt_regs *regs);
+int (*__debugger)(struct pt_regs *regs) __read_mostly;
+int (*__debugger_ipi)(struct pt_regs *regs) __read_mostly;
+int (*__debugger_bpt)(struct pt_regs *regs) __read_mostly;
+int (*__debugger_sstep)(struct pt_regs *regs) __read_mostly;
+int (*__debugger_iabr_match)(struct pt_regs *regs) __read_mostly;
+int (*__debugger_dabr_match)(struct pt_regs *regs) __read_mostly;
+int (*__debugger_fault_handler)(struct pt_regs *regs) __read_mostly;
 
 EXPORT_SYMBOL(__debugger);
 EXPORT_SYMBOL(__debugger_ipi);
@@ -102,11 +101,11 @@ static inline void pmac_backlight_unblank(void) { }
 int die(const char *str, struct pt_regs *regs, long err)
 {
         static struct {
-                spinlock_t lock;
+                raw_spinlock_t lock;
                 u32 lock_owner;
                 int lock_owner_depth;
         } die = {
-                .lock =                 __SPIN_LOCK_UNLOCKED(die.lock),
+                .lock =                 __RAW_SPIN_LOCK_UNLOCKED(die.lock),
                 .lock_owner =           -1,
                 .lock_owner_depth =     0
         };
@@ -120,7 +119,7 @@ int die(const char *str, struct pt_regs *regs, long err)
 
         if (die.lock_owner != raw_smp_processor_id()) {
                 console_verbose();
-                spin_lock_irqsave(&die.lock, flags);
+                raw_spin_lock_irqsave(&die.lock, flags);
                 die.lock_owner = smp_processor_id();
                 die.lock_owner_depth = 0;
                 bust_spinlocks(1);
@@ -146,6 +145,11 @@ int die(const char *str, struct pt_regs *regs, long err)
 #endif
                 printk("%s\n", ppc_md.name ? ppc_md.name : "");
 
+                sysfs_printk_last_file();
+                if (notify_die(DIE_OOPS, str, regs, err, 255,
+                               SIGSEGV) == NOTIFY_STOP)
+                        return 1;
+
                 print_modules();
                 show_regs(regs);
         } else {
@@ -155,7 +159,7 @@ int die(const char *str, struct pt_regs *regs, long err)
         bust_spinlocks(0);
         die.lock_owner = -1;
         add_taint(TAINT_DIE);
-        spin_unlock_irqrestore(&die.lock, flags);
+        raw_spin_unlock_irqrestore(&die.lock, flags);
 
         if (kexec_should_crash(current) ||
                 kexec_sr_activated(smp_processor_id()))
@@ -174,6 +178,15 @@ int die(const char *str, struct pt_regs *regs, long err)
         return 0;
 }
 
+void user_single_step_siginfo(struct task_struct *tsk,
+                                struct pt_regs *regs, siginfo_t *info)
+{
+        memset(info, 0, sizeof(*info));
+        info->si_signo = SIGTRAP;
+        info->si_code = TRAP_TRACE;
+        info->si_addr = (void __user *)regs->nip;
+}
+
 void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr)
 {
         siginfo_t info;
@@ -198,28 +211,6 @@ void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr)
         info.si_code = code;
         info.si_addr = (void __user *) addr;
         force_sig_info(signr, &info, current);
-
-        /*
-         * Init gets no signals that it doesn't have a handler for.
-         * That's all very well, but if it has caused a synchronous
-         * exception and we ignore the resulting signal, it will just
-         * generate the same exception over and over again and we get
-         * nowhere.  Better to kill it and let the kernel panic.
-         */
-        if (is_global_init(current)) {
-                __sighandler_t handler;
-
-                spin_lock_irq(&current->sighand->siglock);
-                handler = current->sighand->action[signr-1].sa.sa_handler;
-                spin_unlock_irq(&current->sighand->siglock);
-                if (handler == SIG_DFL) {
-                        /* init has generated a synchronous exception
-                           and it doesn't have a handler for the signal */
-                        printk(KERN_CRIT "init has generated signal %d "
-                               "but has no handler for it\n", signr);
-                        do_exit(signr);
-                }
-        }
 }
 
 #ifdef CONFIG_PPC64
@@ -307,7 +298,7 @@ static inline int check_io_access(struct pt_regs *regs)
         return 0;
 }
 
-#if defined(CONFIG_4xx) || defined(CONFIG_BOOKE)
+#ifdef CONFIG_PPC_ADV_DEBUG_REGS
 /* On 4xx, the reason for the machine check or program exception
    is in the ESR. */
 #define get_reason(regs)        ((regs)->dsisr)
@@ -491,6 +482,8 @@ void machine_check_exception(struct pt_regs *regs)
 {
         int recover = 0;
 
+        __get_cpu_var(irq_stat).mce_exceptions++;
+
         /* See if any machine dependent calls. In theory, we would want
          * to call the CPU first, and call the ppc_md. one if the CPU
          * one returns a positive number. However there is existing code
@@ -759,7 +752,7 @@ static int emulate_instruction(struct pt_regs *regs)
 
         /* Emulate the mfspr rD, PVR. */
         if ((instword & PPC_INST_MFSPR_PVR_MASK) == PPC_INST_MFSPR_PVR) {
-                PPC_WARN_EMULATED(mfpvr);
+                PPC_WARN_EMULATED(mfpvr, regs);
                 rd = (instword >> 21) & 0x1f;
                 regs->gpr[rd] = mfspr(SPRN_PVR);
                 return 0;
@@ -767,7 +760,7 @@ static int emulate_instruction(struct pt_regs *regs)
 
         /* Emulating the dcba insn is just a no-op.  */
         if ((instword & PPC_INST_DCBA_MASK) == PPC_INST_DCBA) {
-                PPC_WARN_EMULATED(dcba);
+                PPC_WARN_EMULATED(dcba, regs);
                 return 0;
         }
 
@@ -776,7 +769,7 @@ static int emulate_instruction(struct pt_regs *regs)
                 int shift = (instword >> 21) & 0x1c;
                 unsigned long msk = 0xf0000000UL >> shift;
 
-                PPC_WARN_EMULATED(mcrxr);
+                PPC_WARN_EMULATED(mcrxr, regs);
                 regs->ccr = (regs->ccr & ~msk) | ((regs->xer >> shift) & msk);
                 regs->xer &= ~0xf0000000UL;
                 return 0;
@@ -784,19 +777,19 @@ static int emulate_instruction(struct pt_regs *regs)
 
         /* Emulate load/store string insn. */
         if ((instword & PPC_INST_STRING_GEN_MASK) == PPC_INST_STRING) {
-                PPC_WARN_EMULATED(string);
+                PPC_WARN_EMULATED(string, regs);
                 return emulate_string_inst(regs, instword);
         }
 
         /* Emulate the popcntb (Population Count Bytes) instruction. */
         if ((instword & PPC_INST_POPCNTB_MASK) == PPC_INST_POPCNTB) {
-                PPC_WARN_EMULATED(popcntb);
+                PPC_WARN_EMULATED(popcntb, regs);
                 return emulate_popcntb_inst(regs, instword);
         }
 
         /* Emulate isel (Integer Select) instruction */
         if ((instword & PPC_INST_ISEL_MASK) == PPC_INST_ISEL) {
-                PPC_WARN_EMULATED(isel);
+                PPC_WARN_EMULATED(isel, regs);
                 return emulate_isel(regs, instword);
         }
 
@@ -973,6 +966,8 @@ void vsx_unavailable_exception(struct pt_regs *regs)
 
 void performance_monitor_exception(struct pt_regs *regs)
 {
+        __get_cpu_var(irq_stat).pmu_irqs++;
+
         perf_irq(regs);
 }
 
@@ -995,7 +990,7 @@ void SoftwareEmulation(struct pt_regs *regs)
 #ifdef CONFIG_MATH_EMULATION
         errcode = do_mathemu(regs);
         if (errcode >= 0)
-                PPC_WARN_EMULATED(math);
+                PPC_WARN_EMULATED(math, regs);
 
         switch (errcode) {
         case 0:
@@ -1018,7 +1013,7 @@ void SoftwareEmulation(struct pt_regs *regs)
 #elif defined(CONFIG_8XX_MINIMAL_FPEMU)
         errcode = Soft_emulate_8xx(regs);
         if (errcode >= 0)
-                PPC_WARN_EMULATED(8xx);
+                PPC_WARN_EMULATED(8xx, regs);
 
         switch (errcode) {
         case 0:
@@ -1037,10 +1032,69 @@ void SoftwareEmulation(struct pt_regs *regs)
 }
 #endif /* CONFIG_8xx */
 
-#if defined(CONFIG_40x) || defined(CONFIG_BOOKE)
+#ifdef CONFIG_PPC_ADV_DEBUG_REGS
+static void handle_debug(struct pt_regs *regs, unsigned long debug_status)
+{
+        int changed = 0;
+        /*
+         * Determine the cause of the debug event, clear the
+         * event flags and send a trap to the handler. Torez
+         */
+        if (debug_status & (DBSR_DAC1R | DBSR_DAC1W)) {
+                dbcr_dac(current) &= ~(DBCR_DAC1R | DBCR_DAC1W);
+#ifdef CONFIG_PPC_ADV_DEBUG_DAC_RANGE
+                current->thread.dbcr2 &= ~DBCR2_DAC12MODE;
+#endif
+                do_send_trap(regs, mfspr(SPRN_DAC1), debug_status, TRAP_HWBKPT,
+                             5);
+                changed |= 0x01;
+        }  else if (debug_status & (DBSR_DAC2R | DBSR_DAC2W)) {
+                dbcr_dac(current) &= ~(DBCR_DAC2R | DBCR_DAC2W);
+                do_send_trap(regs, mfspr(SPRN_DAC2), debug_status, TRAP_HWBKPT,
+                             6);
+                changed |= 0x01;
+        }  else if (debug_status & DBSR_IAC1) {
+                current->thread.dbcr0 &= ~DBCR0_IAC1;
+                dbcr_iac_range(current) &= ~DBCR_IAC12MODE;
+                do_send_trap(regs, mfspr(SPRN_IAC1), debug_status, TRAP_HWBKPT,
+                             1);
+                changed |= 0x01;
+        }  else if (debug_status & DBSR_IAC2) {
+                current->thread.dbcr0 &= ~DBCR0_IAC2;
+                do_send_trap(regs, mfspr(SPRN_IAC2), debug_status, TRAP_HWBKPT,
+                             2);
+                changed |= 0x01;
+        }  else if (debug_status & DBSR_IAC3) {
+                current->thread.dbcr0 &= ~DBCR0_IAC3;
+                dbcr_iac_range(current) &= ~DBCR_IAC34MODE;
+                do_send_trap(regs, mfspr(SPRN_IAC3), debug_status, TRAP_HWBKPT,
+                             3);
+                changed |= 0x01;
+        }  else if (debug_status & DBSR_IAC4) {
+                current->thread.dbcr0 &= ~DBCR0_IAC4;
+                do_send_trap(regs, mfspr(SPRN_IAC4), debug_status, TRAP_HWBKPT,
+                             4);
+                changed |= 0x01;
+        }
+        /*
+         * At the point this routine was called, the MSR(DE) was turned off.
+         * Check all other debug flags and see if that bit needs to be turned
+         * back on or not.
+         */
+        if (DBCR_ACTIVE_EVENTS(current->thread.dbcr0, current->thread.dbcr1))
+                regs->msr |= MSR_DE;
+        else
+                /* Make sure the IDM flag is off */
+                current->thread.dbcr0 &= ~DBCR0_IDM;
+
+        if (changed & 0x01)
+                mtspr(SPRN_DBCR0, current->thread.dbcr0);
+}
 
 void __kprobes DebugException(struct pt_regs *regs, unsigned long debug_status)
 {
+        current->thread.dbsr = debug_status;
+
         /* Hack alert: On BookE, Branch Taken stops on the branch itself, while
          * on server, it stops on the target of the branch. In order to simulate
          * the server behaviour, we thus restart right away with a single step
@@ -1084,29 +1138,23 @@ void __kprobes DebugException(struct pt_regs *regs, unsigned long debug_status)
                 if (debugger_sstep(regs))
                         return;
 
-                if (user_mode(regs))
-                        current->thread.dbcr0 &= ~(DBCR0_IC);
-
-                _exception(SIGTRAP, regs, TRAP_TRACE, regs->nip);
-        } else if (debug_status & (DBSR_DAC1R | DBSR_DAC1W)) {
-                regs->msr &= ~MSR_DE;
-
                 if (user_mode(regs)) {
-                        current->thread.dbcr0 &= ~(DBSR_DAC1R | DBSR_DAC1W |
-                                                                DBCR0_IDM);
-                } else {
-                        /* Disable DAC interupts */
-                        mtspr(SPRN_DBCR0, mfspr(SPRN_DBCR0) & ~(DBSR_DAC1R |
-                                                DBSR_DAC1W | DBCR0_IDM));
-
-                        /* Clear the DAC event */
-                        mtspr(SPRN_DBSR, (DBSR_DAC1R | DBSR_DAC1W));
+                        current->thread.dbcr0 &= ~DBCR0_IC;
+#ifdef CONFIG_PPC_ADV_DEBUG_REGS
+                        if (DBCR_ACTIVE_EVENTS(current->thread.dbcr0,
+                                               current->thread.dbcr1))
+                                regs->msr |= MSR_DE;
+                        else
+                                /* Make sure the IDM bit is off */
+                                current->thread.dbcr0 &= ~DBCR0_IDM;
+#endif
                 }
-                /* Setup and send the trap to the handler */
-                do_dabr(regs, mfspr(SPRN_DAC1), debug_status);
-        }
+
+                _exception(SIGTRAP, regs, TRAP_TRACE, regs->nip);
+        } else
+                handle_debug(regs, debug_status);
 }
-#endif /* CONFIG_4xx || CONFIG_BOOKE */
+#endif /* CONFIG_PPC_ADV_DEBUG_REGS */
 
 #if !defined(CONFIG_TAU_INT)
 void TAUException(struct pt_regs *regs)
@@ -1129,7 +1177,7 @@ void altivec_assist_exception(struct pt_regs *regs)
 
         flush_altivec_to_thread(current);
 
-        PPC_WARN_EMULATED(altivec);
+        PPC_WARN_EMULATED(altivec, regs);
         err = emulate_altivec(regs);
         if (err == 0) {
                 regs->nip += 4;         /* skip emulated instruction */