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authorNicolas Pitre <nico@cam.org>2007-12-03 17:22:36 -0500
committerRussell King <rmk+kernel@arm.linux.org.uk>2008-01-26 15:25:17 +0000
commit796969104cab0d454dbc792ad0d12a4f365a8564 (patch)
tree214eebbe0c8cdee597184feb365c60b574650f6a /arch/arm
parent785d3cd286f0bf67d1bf692559b9ae5de12678f5 (diff)
ARM kprobes: special hook for the kprobes breakpoint handler
The kprobes code is already able to cope with reentrant probes, so its handler must be called outside of the region protected by undef_lock. If ever this lock is released when handlers are called then this commit could be reverted. Signed-off-by: Nicolas Pitre <nico@marvell.com>
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/kernel/kprobes.c8
-rw-r--r--arch/arm/kernel/traps.c12
2 files changed, 13 insertions, 7 deletions
diff --git a/arch/arm/kernel/kprobes.c b/arch/arm/kernel/kprobes.c
index 450ee2cbfe1..a22a98c43ca 100644
--- a/arch/arm/kernel/kprobes.c
+++ b/arch/arm/kernel/kprobes.c
@@ -26,12 +26,6 @@
#include <asm/traps.h>
#include <asm/cacheflush.h>
-/*
- * This undefined instruction must be unique and
- * reserved solely for kprobes' use.
- */
-#define KPROBE_BREAKPOINT_INSTRUCTION 0xe7f001f8
-
#define MIN_STACK_SIZE(addr) \
min((unsigned long)MAX_STACK_SIZE, \
(unsigned long)current_thread_info() + THREAD_START_SP - (addr))
@@ -206,7 +200,7 @@ void __kprobes kprobe_handler(struct pt_regs *regs)
}
}
-static int kprobe_trap_handler(struct pt_regs *regs, unsigned int instr)
+int kprobe_trap_handler(struct pt_regs *regs, unsigned int instr)
{
kprobe_handler(regs);
return 0;
diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
index 65bb762b2d8..5595fdd75e8 100644
--- a/arch/arm/kernel/traps.c
+++ b/arch/arm/kernel/traps.c
@@ -19,6 +19,7 @@
#include <linux/kallsyms.h>
#include <linux/delay.h>
#include <linux/init.h>
+#include <linux/kprobes.h>
#include <asm/atomic.h>
#include <asm/cacheflush.h>
@@ -313,6 +314,17 @@ asmlinkage void __exception do_undefinstr(struct pt_regs *regs)
get_user(instr, (u32 __user *)pc);
}
+#ifdef CONFIG_KPROBES
+ /*
+ * It is possible to have recursive kprobes, so we can't call
+ * the kprobe trap handler with the undef_lock held.
+ */
+ if (instr == KPROBE_BREAKPOINT_INSTRUCTION && !user_mode(regs)) {
+ kprobe_trap_handler(regs, instr);
+ return;
+ }
+#endif
+
spin_lock_irqsave(&undef_lock, flags);
list_for_each_entry(hook, &undef_hook, node) {
if ((instr & hook->instr_mask) == hook->instr_val &&