diff --git a/arch/sparc64/kernel/process.c b/arch/sparc64/kernel/process.c
index 4129c0449856bbe61a34e670ec87996cd71bd19a..0a0c05fc3a33b5f4d314545239594a3198dd3353 100644
--- a/arch/sparc64/kernel/process.c
+++ b/arch/sparc64/kernel/process.c
@@ -1,6 +1,6 @@
/* arch/sparc64/kernel/process.c
*
- * Copyright (C) 1995, 1996 David S. Miller (davem@caip.rutgers.edu)
+ * Copyright (C) 1995, 1996, 2008 David S. Miller (davem@davemloft.net)
* Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be)
* Copyright (C) 1997, 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
*/
@@ -30,6 +30,7 @@
#include <linux/init.h>
#include <linux/cpu.h>
#include <linux/elfcore.h>
+#include <linux/sysrq.h>
#include <asm/oplib.h>
#include <asm/uaccess.h>
@@ -49,6 +50,8 @@
#include <asm/sstate.h>
#include <asm/reboot.h>
#include <asm/syscalls.h>
+#include <asm/irq_regs.h>
+#include <asm/smp.h>
/* #define VERBOSE_SHOWREGS */
@@ -298,6 +301,118 @@ void show_regs(struct pt_regs *regs)
#endif
}
+#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)
+{
+ flushw_all();
+
+ global_reg_snapshot[this_cpu].tstate = regs->tstate;
+ global_reg_snapshot[this_cpu].tpc = regs->tpc;
+ global_reg_snapshot[this_cpu].tnpc = regs->tnpc;
+ global_reg_snapshot[this_cpu].o7 = regs->u_regs[UREG_I7];
+
+ if (regs->tstate & TSTATE_PRIV) {
+ 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
+ global_reg_snapshot[this_cpu].i7 = 0;
+
+ global_reg_snapshot[this_cpu].thread = tp;
+}
+
+/* In order to avoid hangs we do not try to synchronize with the
+ * global register dump client cpus. The last store they make is to
+ * the thread pointer, so do a short poll waiting for that to become
+ * non-NULL.
+ */
+static void __global_reg_poll(struct global_reg_snapshot *gp)
+{
+ int limit = 0;
+
+ while (!gp->thread && ++limit < 100) {
+ barrier();
+ udelay(1);
+ }
+}
+
+static void sysrq_handle_globreg(int key, struct tty_struct *tty)
+{
+ struct thread_info *tp = current_thread_info();
+ struct pt_regs *regs = get_irq_regs();
+#ifdef CONFIG_KALLSYMS
+ char buffer[KSYM_SYMBOL_LEN];
+#endif
+ unsigned long flags;
+ int this_cpu, cpu;
+
+ if (!regs)
+ regs = tp->kregs;
+
+ spin_lock_irqsave(&global_reg_snapshot_lock, flags);
+
+ memset(global_reg_snapshot, 0, sizeof(global_reg_snapshot));
+
+ this_cpu = raw_smp_processor_id();
+
+ __global_reg_self(tp, regs, this_cpu);
+
+ smp_fetch_global_regs();
+
+ for_each_online_cpu(cpu) {
+ struct global_reg_snapshot *gp = &global_reg_snapshot[cpu];
+ struct thread_info *tp;
+
+ __global_reg_poll(gp);
+
+ tp = gp->thread;
+ printk("%c CPU[%3d]: TSTATE[%016lx] TPC[%016lx] TNPC[%016lx] TASK[%s:%d]\n",
+ (cpu == this_cpu ? '*' : ' '), cpu,
+ gp->tstate, gp->tpc, gp->tnpc,
+ ((tp && tp->task) ? tp->task->comm : "NULL"),
+ ((tp && tp->task) ? tp->task->pid : -1));
+#ifdef CONFIG_KALLSYMS
+ if (gp->tstate & TSTATE_PRIV) {
+ sprint_symbol(buffer, gp->tpc);
+ printk(" TPC[%s] ", buffer);
+ sprint_symbol(buffer, gp->o7);
+ printk("O7[%s] ", buffer);
+ sprint_symbol(buffer, gp->i7);
+ printk("I7[%s]\n", buffer);
+ } else
+#endif
+ {
+ printk(" TPC[%lx] O7[%lx] I7[%lx]\n",
+ gp->tpc, gp->o7, gp->i7);
+ }
+ }
+
+ memset(global_reg_snapshot, 0, sizeof(global_reg_snapshot));
+
+ spin_unlock_irqrestore(&global_reg_snapshot_lock, flags);
+}
+
+static struct sysrq_key_op sparc_globalreg_op = {
+ .handler = sysrq_handle_globreg,
+ .help_msg = "Globalregs",
+ .action_msg = "Show Global CPU Regs",
+};
+
+static int __init sparc_globreg_init(void)
+{
+ return register_sysrq_key('y', &sparc_globalreg_op);
+}
+
+core_initcall(sparc_globreg_init);
+
+#endif
+
unsigned long thread_saved_pc(struct task_struct *tsk)
{
struct thread_info *ti = task_thread_info(tsk);
diff --git a/arch/sparc64/kernel/smp.c b/arch/sparc64/kernel/smp.c
index 0d6403a630acd1f4c2e22201755d67de04a83cc1..fa63c68a181941736a7809553d41538a1c5ab074 100644
--- a/arch/sparc64/kernel/smp.c
+++ b/arch/sparc64/kernel/smp.c
@@ -900,6 +900,9 @@ 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
extern unsigned long xcall_receive_signal;
extern unsigned long xcall_new_mmu_context_version;
#ifdef CONFIG_KGDB
@@ -1080,6 +1083,13 @@ void smp_report_regs(void)
smp_cross_call(&xcall_report_regs, 0, 0, 0);
}
+#ifdef CONFIG_MAGIC_SYSRQ
+void smp_fetch_global_regs(void)
+{
+ smp_cross_call(&xcall_fetch_glob_regs, 0, 0, 0);
+}
+#endif
+
/* We know that the window frames of the user have been flushed
* to the stack before we get here because all callers of us
* are flush_tlb_*() routines, and these run after flush_cache_*()
diff --git a/arch/sparc64/mm/ultra.S b/arch/sparc64/mm/ultra.S
index 15d124963f684237f7599000122f47fe1d9ee342..9bb2d90a9df6ba948e566f6c7c11d92a0a437837 100644
--- a/arch/sparc64/mm/ultra.S
+++ b/arch/sparc64/mm/ultra.S
@@ -1,7 +1,7 @@
/*
* ultra.S: Don't expand these all over the place...
*
- * Copyright (C) 1997, 2000 David S. Miller (davem@redhat.com)
+ * Copyright (C) 1997, 2000, 2008 David S. Miller (davem@davemloft.net)
*/
#include <asm/asi.h>
@@ -15,6 +15,7 @@
#include <asm/thread_info.h>
#include <asm/cacheflush.h>
#include <asm/hypervisor.h>
+#include <asm/cpudata.h>
/* Basically, most of the Spitfire vs. Cheetah madness
* has to do with the fact that Cheetah does not support
@@ -514,6 +515,32 @@ xcall_report_regs:
b rtrap_xcall
ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %l1
+#ifdef CONFIG_MAGIC_SYSRQ
+ .globl xcall_fetch_glob_regs
+xcall_fetch_glob_regs:
+ sethi %hi(global_reg_snapshot), %g1
+ or %g1, %lo(global_reg_snapshot), %g1
+ __GET_CPUID(%g2)
+ sllx %g2, 6, %g3
+ add %g1, %g3, %g1
+ rdpr %tstate, %g7
+ stx %g7, [%g1 + GR_SNAP_TSTATE]
+ rdpr %tpc, %g7
+ stx %g7, [%g1 + GR_SNAP_TPC]
+ rdpr %tnpc, %g7
+ stx %g7, [%g1 + GR_SNAP_TNPC]
+ stx %o7, [%g1 + GR_SNAP_O7]
+ stx %i7, [%g1 + GR_SNAP_I7]
+ sethi %hi(trap_block), %g7
+ or %g7, %lo(trap_block), %g7
+ sllx %g2, TRAP_BLOCK_SZ_SHIFT, %g2
+ add %g7, %g2, %g7
+ ldx [%g7 + TRAP_PER_CPU_THREAD], %g3
+ membar #StoreStore
+ stx %g3, [%g1 + GR_SNAP_THREAD]
+ retry
+#endif /* CONFIG_MAGIC_SYSRQ */
+
#ifdef DCACHE_ALIASING_POSSIBLE
.align 32
.globl xcall_flush_dcache_page_cheetah
diff --git a/drivers/char/sysrq.c b/drivers/char/sysrq.c
index 9e9bad8bdcf4e6725a982f92522b338bbf9731f3..dbce1263bdff2314ed637d647694b5dae68cc905 100644
--- a/drivers/char/sysrq.c
+++ b/drivers/char/sysrq.c
@@ -402,6 +402,7 @@ static struct sysrq_key_op *sysrq_key_table[36] = {
&sysrq_showstate_blocked_op, /* w */
/* x: May be registered on ppc/powerpc for xmon */
NULL, /* x */
+ /* y: May be registered on sparc64 for global register dump */
NULL, /* y */
NULL /* z */
};
diff --git a/include/asm-sparc64/ptrace.h b/include/asm-sparc64/ptrace.h
index 90972a5ada59f8e3b324f430587922c7cbb2a562..d8a56cddf7f26c3f20ad4874eb24f81757f66f56 100644
--- a/include/asm-sparc64/ptrace.h
+++ b/include/asm-sparc64/ptrace.h
@@ -126,6 +126,17 @@ struct sparc_trapf {
#define TRACEREG32_SZ sizeof(struct pt_regs32)
#define STACKFRAME32_SZ sizeof(struct sparc_stackf32)
+struct global_reg_snapshot {
+ unsigned long tstate;
+ unsigned long tpc;
+ unsigned long tnpc;
+ unsigned long o7;
+ unsigned long i7;
+ struct thread_info *thread;
+ unsigned long pad1;
+ unsigned long pad2;
+};
+
#ifdef __KERNEL__
#define __ARCH_WANT_COMPAT_SYS_PTRACE
@@ -295,6 +306,16 @@ extern void __show_regs(struct pt_regs *);
#define SF_XARG5 0x58
#define SF_XXARG 0x5c
+/* global_reg_snapshot offsets */
+#define GR_SNAP_TSTATE 0x00
+#define GR_SNAP_TPC 0x08
+#define GR_SNAP_TNPC 0x10
+#define GR_SNAP_O7 0x18
+#define GR_SNAP_I7 0x20
+#define GR_SNAP_THREAD 0x28
+#define GR_SNAP_PAD1 0x30
+#define GR_SNAP_PAD2 0x38
+
/* Stuff for the ptrace system call */
#define PTRACE_SPARC_DETACH 11
#define PTRACE_GETREGS 12
diff --git a/include/asm-sparc64/smp.h b/include/asm-sparc64/smp.h
index 1c1c5ea5cea5dea69e40cf4c4a96932f4d24d58b..cd0311b2e19dbf63173cde102650b19bea84ddc8 100644
--- a/include/asm-sparc64/smp.h
+++ b/include/asm-sparc64/smp.h
@@ -1,6 +1,6 @@
/* smp.h: Sparc64 specific SMP stuff.
*
- * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
+ * Copyright (C) 1996, 2008 David S. Miller (davem@davemloft.net)
*/
#ifndef _SPARC64_SMP_H
@@ -44,6 +44,8 @@ extern int hard_smp_processor_id(void);
extern void smp_fill_in_sib_core_maps(void);
extern void cpu_play_dead(void);
+extern void smp_fetch_global_regs(void);
+
#ifdef CONFIG_HOTPLUG_CPU
extern int __cpu_disable(void);
extern void __cpu_die(unsigned int cpu);
@@ -55,6 +57,7 @@ extern void __cpu_die(unsigned int cpu);
#define hard_smp_processor_id() 0
#define smp_fill_in_sib_core_maps() do { } while (0)
+#define smp_fetch_global_regs() do { } while (0)
#endif /* !(CONFIG_SMP) */