7 files changed, 48 insertions, 132 deletions

diff --git a/arch/sparc64/kernel/of_device.c b/arch/sparc64/kernel/of_device.c
index 4fd48ab7dda4..f8b50cbf4bf7 100644
--- a/arch/sparc64/kernel/of_device.c
+++ b/arch/sparc64/kernel/of_device.c
@@ -56,9 +56,6 @@ struct of_device *of_find_device_by_node(struct device_node *dp)
 EXPORT_SYMBOL(of_find_device_by_node);
 
 #ifdef CONFIG_PCI
-struct bus_type isa_bus_type;
-EXPORT_SYMBOL(isa_bus_type);
-
 struct bus_type ebus_bus_type;
 EXPORT_SYMBOL(ebus_bus_type);
 #endif
@@ -842,8 +839,6 @@ static int __init of_bus_driver_init(void)
         err = of_bus_type_init(&of_platform_bus_type, "of");
 #ifdef CONFIG_PCI
         if (!err)
-                err = of_bus_type_init(&isa_bus_type, "isa");
-        if (!err)
                 err = of_bus_type_init(&ebus_bus_type, "ebus");
 #endif
 #ifdef CONFIG_SBUS
diff --git a/arch/sparc64/kernel/process.c b/arch/sparc64/kernel/process.c
index 8a9cd3e165b9..7f5debdc5fed 100644
--- a/arch/sparc64/kernel/process.c
+++ b/arch/sparc64/kernel/process.c
@@ -52,8 +52,6 @@
 #include <asm/irq_regs.h>
 #include <asm/smp.h>
 
-/* #define VERBOSE_SHOWREGS */
-
 static void sparc64_yield(int cpu)
 {
         if (tlb_type != hypervisor)
@@ -213,22 +211,8 @@ static void show_regwindow(struct pt_regs *regs)
                 printk("I7: <%pS>\n", (void *) rwk->ins[7]);
 }
 
-#ifdef CONFIG_SMP
-static DEFINE_SPINLOCK(regdump_lock);
-#endif
-
-void __show_regs(struct pt_regs * regs)
+void show_regs(struct pt_regs *regs)
 {
-#ifdef CONFIG_SMP
-        unsigned long flags;
-
-        /* Protect against xcall ipis which might lead to livelock on the lock */
-        __asm__ __volatile__("rdpr      %%pstate, %0\n\t"
-                             "wrpr      %0, %1, %%pstate"
-                             : "=r" (flags)
-                             : "i" (PSTATE_IE));
-        spin_lock(&regdump_lock);
-#endif
         printk("TSTATE: %016lx TPC: %016lx TNPC: %016lx Y: %08x    %s\n", regs->tstate,
                regs->tpc, regs->tnpc, regs->y, print_tainted());
         printk("TPC: <%pS>\n", (void *) regs->tpc);
@@ -246,64 +230,24 @@ void __show_regs(struct pt_regs * regs)
                regs->u_regs[15]);
         printk("RPC: <%pS>\n", (void *) regs->u_regs[15]);
         show_regwindow(regs);
-#ifdef CONFIG_SMP
-        spin_unlock(&regdump_lock);
-        __asm__ __volatile__("wrpr      %0, 0, %%pstate"
-                             : : "r" (flags));
-#endif
 }
 
-#ifdef VERBOSE_SHOWREGS
-static void idump_from_user (unsigned int *pc)
-{
-        int i;
-        int code;
-        
-        if((((unsigned long) pc) & 3))
-                return;
-        
-        pc -= 3;
-        for(i = -3; i < 6; i++) {
-                get_user(code, pc);
-                printk("%c%08x%c",i?' ':'<',code,i?' ':'>');
-                pc++;
-        }
-        printk("\n");
-}
-#endif
+struct global_reg_snapshot global_reg_snapshot[NR_CPUS];
+static DEFINE_SPINLOCK(global_reg_snapshot_lock);
 
-void show_regs(struct pt_regs *regs)
+static bool kstack_valid(struct thread_info *tp, struct reg_window *rw)
 {
-#ifdef VERBOSE_SHOWREGS
-        extern long etrap, etraptl1;
-#endif
-        __show_regs(regs);
-#if 0
-#ifdef CONFIG_SMP
-        {
-                extern void smp_report_regs(void);
+        unsigned long thread_base, fp;
 
-                smp_report_regs();
-        }
-#endif
-#endif
+        thread_base = (unsigned long) tp;
+        fp = (unsigned long) rw;
 
-#ifdef VERBOSE_SHOWREGS 
-        if (regs->tpc >= &etrap && regs->tpc < &etraptl1 &&
-            regs->u_regs[14] >= (long)current - PAGE_SIZE &&
-            regs->u_regs[14] < (long)current + 6 * PAGE_SIZE) {
-                printk ("*********parent**********\n");
-                __show_regs((struct pt_regs *)(regs->u_regs[14] + PTREGS_OFF));
-                idump_from_user(((struct pt_regs *)(regs->u_regs[14] + PTREGS_OFF))->tpc);
-                printk ("*********endpar**********\n");
-        }
-#endif
+        if (fp < (thread_base + sizeof(struct thread_info)) ||
+            fp >= (thread_base + THREAD_SIZE))
+                return false;
+        return true;
 }
 
-#ifdef CONFIG_MAGIC_SYSRQ
-struct global_reg_snapshot global_reg_snapshot[NR_CPUS];
-static DEFINE_SPINLOCK(global_reg_snapshot_lock);
-
 static void __global_reg_self(struct thread_info *tp, struct pt_regs *regs,
                               int this_cpu)
 {
@@ -315,14 +259,22 @@ static void __global_reg_self(struct thread_info *tp, struct pt_regs *regs,
         global_reg_snapshot[this_cpu].o7 = regs->u_regs[UREG_I7];
 
         if (regs->tstate & TSTATE_PRIV) {
+                struct thread_info *tp = current_thread_info();
                 struct reg_window *rw;
 
                 rw = (struct reg_window *)
                         (regs->u_regs[UREG_FP] + STACK_BIAS);
-                global_reg_snapshot[this_cpu].i7 = rw->ins[6];
-        } else
+                if (kstack_valid(tp, rw)) {
+                        global_reg_snapshot[this_cpu].i7 = rw->ins[7];
+                        rw = (struct reg_window *)
+                                (rw->ins[6] + STACK_BIAS);
+                        if (kstack_valid(tp, rw))
+                                global_reg_snapshot[this_cpu].rpc = rw->ins[7];
+                }
+        } else {
                 global_reg_snapshot[this_cpu].i7 = 0;
-
+                global_reg_snapshot[this_cpu].rpc = 0;
+        }
         global_reg_snapshot[this_cpu].thread = tp;
 }
 
@@ -341,7 +293,7 @@ static void __global_reg_poll(struct global_reg_snapshot *gp)
         }
 }
 
-static void sysrq_handle_globreg(int key, struct tty_struct *tty)
+void __trigger_all_cpu_backtrace(void)
 {
         struct thread_info *tp = current_thread_info();
         struct pt_regs *regs = get_irq_regs();
@@ -375,13 +327,14 @@ static void sysrq_handle_globreg(int key, struct tty_struct *tty)
                        ((tp && tp->task) ? tp->task->pid : -1));
 
                 if (gp->tstate & TSTATE_PRIV) {
-                        printk("             TPC[%pS] O7[%pS] I7[%pS]\n",
+                        printk("             TPC[%pS] O7[%pS] I7[%pS] RPC[%pS]\n",
                                (void *) gp->tpc,
                                (void *) gp->o7,
-                               (void *) gp->i7);
+                               (void *) gp->i7,
+                               (void *) gp->rpc);
                 } else {
-                        printk("             TPC[%lx] O7[%lx] I7[%lx]\n",
-                               gp->tpc, gp->o7, gp->i7);
+                        printk("             TPC[%lx] O7[%lx] I7[%lx] RPC[%lx]\n",
+                               gp->tpc, gp->o7, gp->i7, gp->rpc);
                 }
         }
 
@@ -390,6 +343,13 @@ static void sysrq_handle_globreg(int key, struct tty_struct *tty)
         spin_unlock_irqrestore(&global_reg_snapshot_lock, flags);
 }
 
+#ifdef CONFIG_MAGIC_SYSRQ
+
+static void sysrq_handle_globreg(int key, struct tty_struct *tty)
+{
+        __trigger_all_cpu_backtrace();
+}
+
 static struct sysrq_key_op sparc_globalreg_op = {
         .handler        = sysrq_handle_globreg,
         .help_msg       = "Globalregs",
diff --git a/arch/sparc64/kernel/signal.c b/arch/sparc64/kernel/signal.c
index d1b84456a9ee..ca5a6ae3a6e2 100644
--- a/arch/sparc64/kernel/signal.c
+++ b/arch/sparc64/kernel/signal.c
@@ -2,7 +2,7 @@
  *  arch/sparc64/kernel/signal.c
  *
  *  Copyright (C) 1991, 1992  Linus Torvalds
- *  Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
+ *  Copyright (C) 1995, 2008 David S. Miller (davem@davemloft.net)
  *  Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
  *  Copyright (C) 1997 Eddie C. Dost   (ecd@skynet.be)
  *  Copyright (C) 1997,1998 Jakub Jelinek   (jj@sunsite.mff.cuni.cz)
@@ -91,7 +91,9 @@ asmlinkage void sparc64_set_context(struct pt_regs *regs)
         err |= __get_user(regs->u_regs[UREG_G4], (&(*grp)[MC_G4]));
         err |= __get_user(regs->u_regs[UREG_G5], (&(*grp)[MC_G5]));
         err |= __get_user(regs->u_regs[UREG_G6], (&(*grp)[MC_G6]));
-        err |= __get_user(regs->u_regs[UREG_G7], (&(*grp)[MC_G7]));
+
+        /* Skip %g7 as that's the thread register in userspace.  */
+
         err |= __get_user(regs->u_regs[UREG_I0], (&(*grp)[MC_O0]));
         err |= __get_user(regs->u_regs[UREG_I1], (&(*grp)[MC_O1]));
         err |= __get_user(regs->u_regs[UREG_I2], (&(*grp)[MC_O2]));
diff --git a/arch/sparc64/kernel/smp.c b/arch/sparc64/kernel/smp.c
index 7cf72b4bb108..340842e51ce1 100644
--- a/arch/sparc64/kernel/smp.c
+++ b/arch/sparc64/kernel/smp.c
@@ -843,7 +843,6 @@ void smp_tsb_sync(struct mm_struct *mm)
 extern unsigned long xcall_flush_tlb_mm;
 extern unsigned long xcall_flush_tlb_pending;
 extern unsigned long xcall_flush_tlb_kernel_range;
-extern unsigned long xcall_report_regs;
 #ifdef CONFIG_MAGIC_SYSRQ
 extern unsigned long xcall_fetch_glob_regs;
 #endif
@@ -1022,11 +1021,6 @@ void kgdb_roundup_cpus(unsigned long flags)
 }
 #endif
 
-void smp_report_regs(void)
-{
-        smp_cross_call(&xcall_report_regs, 0, 0, 0);
-}
-
 #ifdef CONFIG_MAGIC_SYSRQ
 void smp_fetch_global_regs(void)
 {
diff --git a/arch/sparc64/kernel/sparc64_ksyms.c b/arch/sparc64/kernel/sparc64_ksyms.c
index 504e678ee128..0804f71df6cb 100644
--- a/arch/sparc64/kernel/sparc64_ksyms.c
+++ b/arch/sparc64/kernel/sparc64_ksyms.c
@@ -68,7 +68,6 @@ extern void *__memscan_zero(void *, size_t);
 extern void *__memscan_generic(void *, int, size_t);
 extern int __memcmp(const void *, const void *, __kernel_size_t);
 extern __kernel_size_t strlen(const char *);
-extern void show_regs(struct pt_regs *);
 extern void syscall_trace(struct pt_regs *, int);
 extern void sys_sigsuspend(void);
 extern int compat_sys_ioctl(unsigned int fd, unsigned int cmd, u32 arg);
diff --git a/arch/sparc64/kernel/traps.c b/arch/sparc64/kernel/traps.c
index bd30ecba5630..404e8561e2d0 100644
--- a/arch/sparc64/kernel/traps.c
+++ b/arch/sparc64/kernel/traps.c
@@ -1777,7 +1777,7 @@ static void sun4v_log_error(struct pt_regs *regs, struct sun4v_error_entry *ent,
                pfx,
                ent->err_raddr, ent->err_size, ent->err_cpu);
 
-        __show_regs(regs);
+        show_regs(regs);
 
         if ((cnt = atomic_read(ocnt)) != 0) {
                 atomic_set(ocnt, 0);
@@ -2177,7 +2177,6 @@ static inline struct reg_window *kernel_stack_up(struct reg_window *rw)
 void die_if_kernel(char *str, struct pt_regs *regs)
 {
         static int die_counter;
-        extern void smp_report_regs(void);
         int count = 0;
         
         /* Amuse the user. */
@@ -2190,7 +2189,7 @@ void die_if_kernel(char *str, struct pt_regs *regs)
         printk("%s(%d): %s [#%d]\n", current->comm, task_pid_nr(current), str, ++die_counter);
         notify_die(DIE_OOPS, str, regs, 0, 255, SIGSEGV);
         __asm__ __volatile__("flushw");
-        __show_regs(regs);
+        show_regs(regs);
         add_taint(TAINT_DIE);
         if (regs->tstate & TSTATE_PRIV) {
                 struct reg_window *rw = (struct reg_window *)
@@ -2215,11 +2214,6 @@ void die_if_kernel(char *str, struct pt_regs *regs)
                 }
                 user_instruction_dump ((unsigned int __user *) regs->tpc);
         }
-#if 0
-#ifdef CONFIG_SMP
-        smp_report_regs();
-#endif
-#endif                                                  
         if (regs->tstate & TSTATE_PRIV)
                 do_exit(SIGKILL);
         do_exit(SIGSEGV);
diff --git a/arch/sparc64/mm/ultra.S b/arch/sparc64/mm/ultra.S
index 4c8ca131ffaf..ff1dc44d363e 100644
--- a/arch/sparc64/mm/ultra.S
+++ b/arch/sparc64/mm/ultra.S
@@ -480,41 +480,6 @@ xcall_sync_tick:
         b               rtrap_xcall
          ldx            [%sp + PTREGS_OFF + PT_V9_TSTATE], %l1
 
-        /* NOTE: This is SPECIAL!!  We do etrap/rtrap however
-         *       we choose to deal with the "BH's run with
-         *       %pil==15" problem (described in asm/pil.h)
-         *       by just invoking rtrap directly past where
-         *       BH's are checked for.
-         *
-         *       We do it like this because we do not want %pil==15
-         *       lockups to prevent regs being reported.
-         */
-        .globl          xcall_report_regs
-xcall_report_regs:
-
-661:    rdpr            %pstate, %g2
-        wrpr            %g2, PSTATE_IG | PSTATE_AG, %pstate
-        .section        .sun4v_2insn_patch, "ax"
-        .word           661b
-        nop
-        nop
-        .previous
-
-        rdpr            %pil, %g2
-        wrpr            %g0, 15, %pil
-        sethi           %hi(109f), %g7
-        b,pt            %xcc, etrap_irq
-109:     or             %g7, %lo(109b), %g7
-#ifdef CONFIG_TRACE_IRQFLAGS
-        call            trace_hardirqs_off
-         nop
-#endif
-        call            __show_regs
-         add            %sp, PTREGS_OFF, %o0
-        /* Has to be a non-v9 branch due to the large distance. */
-        b               rtrap_xcall
-         ldx            [%sp + PTREGS_OFF + PT_V9_TSTATE], %l1
-
 #ifdef CONFIG_MAGIC_SYSRQ
         .globl          xcall_fetch_glob_regs
 xcall_fetch_glob_regs:
@@ -531,6 +496,13 @@ xcall_fetch_glob_regs:
         stx             %g7, [%g1 + GR_SNAP_TNPC]
         stx             %o7, [%g1 + GR_SNAP_O7]
         stx             %i7, [%g1 + GR_SNAP_I7]
+        /* Don't try this at home kids... */
+        rdpr            %cwp, %g2
+        sub             %g2, 1, %g7
+        wrpr            %g7, %cwp
+        mov             %i7, %g7
+        wrpr            %g2, %cwp
+        stx             %g7, [%g1 + GR_SNAP_RPC]
         sethi           %hi(trap_block), %g7
         or              %g7, %lo(trap_block), %g7
         sllx            %g2, TRAP_BLOCK_SZ_SHIFT, %g2