sh: Add die chain notifiers.
Add the atomic die chains in, kprobes needs these.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/kernel/process.c b/arch/sh/kernel/process.c
index 286c803..329b3f3 100644
--- a/arch/sh/kernel/process.c
+++ b/arch/sh/kernel/process.c
@@ -7,7 +7,7 @@
*
* SuperH version: Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima
* Copyright (C) 2006 Lineo Solutions Inc. support SH4A UBC
- * Copyright (C) 2002 - 2006 Paul Mundt
+ * Copyright (C) 2002 - 2007 Paul Mundt
*/
#include <linux/module.h>
#include <linux/mm.h>
@@ -15,6 +15,7 @@
#include <linux/pm.h>
#include <linux/kallsyms.h>
#include <linux/kexec.h>
+#include <asm/kdebug.h>
#include <asm/uaccess.h>
#include <asm/mmu_context.h>
#include <asm/ubc.h>
@@ -299,8 +300,8 @@
ctrl_outl(0, UBC_BAMRA);
if (current_cpu_data.type == CPU_SH7729 ||
- current_cpu_data.type == CPU_SH7710 ||
- current_cpu_data.type == CPU_SH7712 ) {
+ current_cpu_data.type == CPU_SH7710 ||
+ current_cpu_data.type == CPU_SH7712) {
ctrl_outw(BBR_INST | BBR_READ | BBR_CPU, UBC_BBRA);
ctrl_outl(BRCR_PCBA | BRCR_PCTE, UBC_BRCR);
} else {
@@ -496,6 +497,10 @@
/* Rewind */
regs->pc -= 2;
+ if (notify_die(DIE_TRAP, regs, regs->tra & 0xff,
+ SIGTRAP) == NOTIFY_STOP)
+ return;
+
force_sig(SIGTRAP, current);
}
@@ -511,6 +516,10 @@
/* Rewind */
regs->pc -= 2;
+ if (notify_die(DIE_TRAP, regs, TRAPA_BUG_OPCODE & 0xff,
+ SIGTRAP) == NOTIFY_STOP)
+ return;
+
#ifdef CONFIG_BUG
if (__kernel_text_address(instruction_pointer(regs))) {
u16 insn = *(u16 *)instruction_pointer(regs);
diff --git a/arch/sh/kernel/traps.c b/arch/sh/kernel/traps.c
index 7710783..7b40f0f 100644
--- a/arch/sh/kernel/traps.c
+++ b/arch/sh/kernel/traps.c
@@ -5,7 +5,7 @@
* SuperH version: Copyright (C) 1999 Niibe Yutaka
* Copyright (C) 2000 Philipp Rumpf
* Copyright (C) 2000 David Howells
- * Copyright (C) 2002 - 2006 Paul Mundt
+ * Copyright (C) 2002 - 2007 Paul Mundt
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
@@ -23,6 +23,7 @@
#include <linux/limits.h>
#include <asm/system.h>
#include <asm/uaccess.h>
+#include <asm/kdebug.h>
#ifdef CONFIG_SH_KGDB
#include <asm/kgdb.h>
@@ -75,7 +76,21 @@
}
}
-DEFINE_SPINLOCK(die_lock);
+ATOMIC_NOTIFIER_HEAD(shdie_chain);
+
+int register_die_notifier(struct notifier_block *nb)
+{
+ return atomic_notifier_chain_register(&shdie_chain, nb);
+}
+EXPORT_SYMBOL(register_die_notifier);
+
+int unregister_die_notifier(struct notifier_block *nb)
+{
+ return atomic_notifier_chain_unregister(&shdie_chain, nb);
+}
+EXPORT_SYMBOL(unregister_die_notifier);
+
+static DEFINE_SPINLOCK(die_lock);
void die(const char * str, struct pt_regs * regs, long err)
{
diff --git a/arch/sh/mm/fault.c b/arch/sh/mm/fault.c
index fa5d7f0..0ecc117 100644
--- a/arch/sh/mm/fault.c
+++ b/arch/sh/mm/fault.c
@@ -2,7 +2,7 @@
* Page fault handler for SH with an MMU.
*
* Copyright (C) 1999 Niibe Yutaka
- * Copyright (C) 2003 Paul Mundt
+ * Copyright (C) 2003 - 2007 Paul Mundt
*
* Based on linux/arch/i386/mm/fault.c:
* Copyright (C) 1995 Linus Torvalds
@@ -15,12 +15,42 @@
#include <linux/mm.h>
#include <linux/hardirq.h>
#include <linux/kprobes.h>
+#include <asm/kdebug.h>
#include <asm/system.h>
#include <asm/mmu_context.h>
#include <asm/tlbflush.h>
#include <asm/kgdb.h>
-extern void die(const char *,struct pt_regs *,long);
+#ifdef CONFIG_KPROBES
+ATOMIC_NOTIFIER_HEAD(notify_page_fault_chain);
+
+/* Hook to register for page fault notifications */
+int register_page_fault_notifier(struct notifier_block *nb)
+{
+ return atomic_notifier_chain_register(¬ify_page_fault_chain, nb);
+}
+
+int unregister_page_fault_notifier(struct notifier_block *nb)
+{
+ return atomic_notifier_chain_unregister(¬ify_page_fault_chain, nb);
+}
+
+static inline int notify_page_fault(enum die_val val, struct pt_regs *regs,
+ int trap, int sig)
+{
+ struct die_args args = {
+ .regs = regs,
+ .trapnr = trap,
+ };
+ return atomic_notifier_call_chain(¬ify_page_fault_chain, val, &args);
+}
+#else
+static inline int notify_page_fault(enum die_val val, struct pt_regs *regs,
+ int trap, int sig)
+{
+ return NOTIFY_DONE;
+}
+#endif
/*
* This routine handles page faults. It determines the address,
@@ -39,6 +69,11 @@
siginfo_t info;
trace_hardirqs_on();
+
+ if (notify_page_fault(DIE_PAGE_FAULT, regs,
+ writeaccess, SIGSEGV) == NOTIFY_STOP)
+ return;
+
local_irq_enable();
#ifdef CONFIG_SH_KGDB
diff --git a/include/asm-sh/kdebug.h b/include/asm-sh/kdebug.h
new file mode 100644
index 0000000..ef009ba
--- /dev/null
+++ b/include/asm-sh/kdebug.h
@@ -0,0 +1,35 @@
+#ifndef __ASM_SH_KDEBUG_H
+#define __ASM_SH_KDEBUG_H
+
+#include <linux/notifier.h>
+
+struct pt_regs;
+
+struct die_args {
+ struct pt_regs *regs;
+ int trapnr;
+};
+
+int register_die_notifier(struct notifier_block *nb);
+int unregister_die_notifier(struct notifier_block *nb);
+int register_page_fault_notifier(struct notifier_block *nb);
+int unregister_page_fault_notifier(struct notifier_block *nb);
+extern struct atomic_notifier_head shdie_chain;
+
+/* Grossly misnamed. */
+enum die_val {
+ DIE_TRAP,
+ DIE_PAGE_FAULT,
+};
+
+static inline int notify_die(enum die_val val, struct pt_regs *regs,
+ int trap, int sig)
+{
+ struct die_args args = {
+ .regs = regs,
+ .trapnr = trap,
+ };
+
+ return atomic_notifier_call_chain(&shdie_chain, val, &args);
+}
+#endif /* __ASM_SH_KDEBUG_H */
diff --git a/include/asm-sh/system.h b/include/asm-sh/system.h
index 4a6a19f..127af30 100644
--- a/include/asm-sh/system.h
+++ b/include/asm-sh/system.h
@@ -9,6 +9,7 @@
#include <linux/irqflags.h>
#include <linux/compiler.h>
#include <asm/types.h>
+#include <asm/ptrace.h>
/*
* switch_to() should switch tasks to task nr n, first
@@ -255,6 +256,8 @@
(unsigned long)_n_, sizeof(*(ptr))); \
})
+extern void die(const char *str, struct pt_regs *regs, long err) __attribute__ ((noreturn));
+
extern void *set_exception_table_vec(unsigned int vec, void *handler);
static inline void *set_exception_table_evt(unsigned int evt, void *handler)