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authorPaul Mundt <lethal@linux-sh.org>2007-05-01 16:33:10 +0900
committerPaul Mundt <lethal@hera.kernel.org>2007-05-07 02:11:57 +0000
commit3a2e117e220f000f95187ea1e1bbe83b0ed5fdfb (patch)
tree57fab5755138283793647b5d0d2a2c872f00a430 /arch
parent3dde7a3c74bcc25c6fc31b836fec8c91fb0b2b8f (diff)
downloadlinux-2.6.34-ux500-3a2e117e220f000f95187ea1e1bbe83b0ed5fdfb.tar.gz
sh: Add die chain notifiers.
Add the atomic die chains in, kprobes needs these. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/sh/kernel/process.c15
-rw-r--r--arch/sh/kernel/traps.c19
-rw-r--r--arch/sh/mm/fault.c39
3 files changed, 66 insertions, 7 deletions
diff --git a/arch/sh/kernel/process.c b/arch/sh/kernel/process.c
index 286c80388bf..329b3f3051d 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 @@ static void ubc_set_tracing(int asid, unsigned long pc)
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 @@ asmlinkage void debug_trap_handler(unsigned long r4, unsigned long r5,
/* 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 @@ asmlinkage void bug_trap_handler(unsigned long r4, unsigned long r5,
/* 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 77107838271..7b40f0ff3df 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 @@ static void dump_mem(const char *str, unsigned long bottom, unsigned long top)
}
}
-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 fa5d7f0b9f1..0ecc117cade 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(&notify_page_fault_chain, nb);
+}
+
+int unregister_page_fault_notifier(struct notifier_block *nb)
+{
+ return atomic_notifier_chain_unregister(&notify_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(&notify_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 @@ asmlinkage void __kprobes do_page_fault(struct pt_regs *regs,
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