X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;ds=sidebyside;f=arch%2Farm%2Fkernel%2Ftraps.c;h=5595fdd75e8200ec0e8d5ea8a54c750ed0398e1f;hb=d35c7b0e54a596c5a8134d75999b7f391a9c6550;hp=4764bd9ccee801ced5838d9043a5923c9e931cb8;hpb=0a4908e19fd016d60403fc76cf38b2d08d21e2d2;p=linux-2.6-omap-h63xx.git

diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
index 4764bd9ccee..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>
@@ -46,15 +47,6 @@ __setup("user_debug=", user_debug_setup);
 
 static void dump_mem(const char *str, unsigned long bottom, unsigned long top);
 
-static inline int in_exception_text(unsigned long ptr)
-{
-	extern char __exception_text_start[];
-	extern char __exception_text_end[];
-
-	return ptr >= (unsigned long)&__exception_text_start &&
-	       ptr < (unsigned long)&__exception_text_end;
-}
-
 void dump_backtrace_entry(unsigned long where, unsigned long from, unsigned long frame)
 {
 #ifdef CONFIG_KALLSYMS
@@ -322,12 +314,23 @@ 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 &&
 		    (regs->ARM_cpsr & hook->cpsr_mask) == hook->cpsr_val) {
 			if (hook->fn(regs, instr) == 0) {
-				spin_unlock_irq(&undef_lock);
+				spin_unlock_irqrestore(&undef_lock, flags);
 				return;
 			}
 		}
@@ -509,7 +512,7 @@ asmlinkage int arm_syscall(int no, struct pt_regs *regs)
 	 * existence.  Don't ever use this from user code.
 	 */
 	case 0xfff0:
-	{
+	for (;;) {
 		extern void do_DataAbort(unsigned long addr, unsigned int fsr,
 					 struct pt_regs *regs);
 		unsigned long val;
@@ -545,7 +548,6 @@ asmlinkage int arm_syscall(int no, struct pt_regs *regs)
 		up_read(&mm->mmap_sem);
 		/* simulate a write access fault */
 		do_DataAbort(addr, 15 + (1 << 11), regs);
-		return -1;
 	}
 #endif