#include <linux/init.h>
#include <linux/module.h>
#include <linux/moduleloader.h>
+#include <asm-generic/sections.h>
#include <asm/cacheflush.h>
#include <asm/errno.h>
#include <asm/kdebug.h>
* get_insn_slot() - Find a slot on an executable page for an instruction.
* We allocate an executable page if there's no room on existing ones.
*/
-kprobe_opcode_t *get_insn_slot(void)
+kprobe_opcode_t __kprobes *get_insn_slot(void)
{
struct kprobe_insn_page *kip;
struct hlist_node *pos;
return kip->insns;
}
-void free_insn_slot(kprobe_opcode_t *slot)
+void __kprobes free_insn_slot(kprobe_opcode_t *slot)
{
struct kprobe_insn_page *kip;
struct hlist_node *pos;
}
/* Locks kprobe: irqs must be disabled */
-void lock_kprobes(void)
+void __kprobes lock_kprobes(void)
{
+ unsigned long flags = 0;
+
+ /* Avoiding local interrupts to happen right after we take the kprobe_lock
+ * and before we get a chance to update kprobe_cpu, this to prevent
+ * deadlock when we have a kprobe on ISR routine and a kprobe on task
+ * routine
+ */
+ local_irq_save(flags);
+
spin_lock(&kprobe_lock);
kprobe_cpu = smp_processor_id();
+
+ local_irq_restore(flags);
}
-void unlock_kprobes(void)
+void __kprobes unlock_kprobes(void)
{
+ unsigned long flags = 0;
+
+ /* Avoiding local interrupts to happen right after we update
+ * kprobe_cpu and before we get a a chance to release kprobe_lock,
+ * this to prevent deadlock when we have a kprobe on ISR routine and
+ * a kprobe on task routine
+ */
+ local_irq_save(flags);
+
kprobe_cpu = NR_CPUS;
spin_unlock(&kprobe_lock);
+
+ local_irq_restore(flags);
}
/* You have to be holding the kprobe_lock */
-struct kprobe *get_kprobe(void *addr)
+struct kprobe __kprobes *get_kprobe(void *addr)
{
struct hlist_head *head;
struct hlist_node *node;
* Aggregate handlers for multiple kprobes support - these handlers
* take care of invoking the individual kprobe handlers on p->list
*/
-static int aggr_pre_handler(struct kprobe *p, struct pt_regs *regs)
+static int __kprobes aggr_pre_handler(struct kprobe *p, struct pt_regs *regs)
{
struct kprobe *kp;
return 0;
}
-static void aggr_post_handler(struct kprobe *p, struct pt_regs *regs,
- unsigned long flags)
+static void __kprobes aggr_post_handler(struct kprobe *p, struct pt_regs *regs,
+ unsigned long flags)
{
struct kprobe *kp;
return;
}
-static int aggr_fault_handler(struct kprobe *p, struct pt_regs *regs,
- int trapnr)
+static int __kprobes aggr_fault_handler(struct kprobe *p, struct pt_regs *regs,
+ int trapnr)
{
/*
* if we faulted "during" the execution of a user specified
return 0;
}
-static int aggr_break_handler(struct kprobe *p, struct pt_regs *regs)
+static int __kprobes aggr_break_handler(struct kprobe *p, struct pt_regs *regs)
{
struct kprobe *kp = curr_kprobe;
if (curr_kprobe && kp->break_handler) {
return 0;
}
-struct kretprobe_instance *get_free_rp_inst(struct kretprobe *rp)
+struct kretprobe_instance __kprobes *get_free_rp_inst(struct kretprobe *rp)
{
struct hlist_node *node;
struct kretprobe_instance *ri;
return NULL;
}
-static struct kretprobe_instance *get_used_rp_inst(struct kretprobe *rp)
+static struct kretprobe_instance __kprobes *get_used_rp_inst(struct kretprobe
+ *rp)
{
struct hlist_node *node;
struct kretprobe_instance *ri;
return NULL;
}
-void add_rp_inst(struct kretprobe_instance *ri)
+void __kprobes add_rp_inst(struct kretprobe_instance *ri)
{
/*
* Remove rp inst off the free list -
hlist_add_head(&ri->uflist, &ri->rp->used_instances);
}
-void recycle_rp_inst(struct kretprobe_instance *ri)
+void __kprobes recycle_rp_inst(struct kretprobe_instance *ri)
{
/* remove rp inst off the rprobe_inst_table */
hlist_del(&ri->hlist);
kfree(ri);
}
-struct hlist_head * kretprobe_inst_table_head(struct task_struct *tsk)
+struct hlist_head __kprobes *kretprobe_inst_table_head(struct task_struct *tsk)
{
return &kretprobe_inst_table[hash_ptr(tsk, KPROBE_HASH_BITS)];
}
* instances associated with this task. These left over instances represent
* probed functions that have been called but will never return.
*/
-void kprobe_flush_task(struct task_struct *tk)
+void __kprobes kprobe_flush_task(struct task_struct *tk)
{
struct kretprobe_instance *ri;
struct hlist_head *head;
* This kprobe pre_handler is registered with every kretprobe. When probe
* hits it will set up the return probe.
*/
-static int pre_handler_kretprobe(struct kprobe *p, struct pt_regs *regs)
+static int __kprobes pre_handler_kretprobe(struct kprobe *p,
+ struct pt_regs *regs)
{
struct kretprobe *rp = container_of(p, struct kretprobe, kp);
* Add the new probe to old_p->list. Fail if this is the
* second jprobe at the address - two jprobes can't coexist
*/
-static int add_new_kprobe(struct kprobe *old_p, struct kprobe *p)
+static int __kprobes add_new_kprobe(struct kprobe *old_p, struct kprobe *p)
{
struct kprobe *kp;
* the intricacies
* TODO: Move kcalloc outside the spinlock
*/
-static int register_aggr_kprobe(struct kprobe *old_p, struct kprobe *p)
+static int __kprobes register_aggr_kprobe(struct kprobe *old_p,
+ struct kprobe *p)
{
int ret = 0;
struct kprobe *ap;
spin_unlock_irqrestore(&kprobe_lock, flags);
}
-int register_kprobe(struct kprobe *p)
+static int __kprobes in_kprobes_functions(unsigned long addr)
+{
+ if (addr >= (unsigned long)__kprobes_text_start
+ && addr < (unsigned long)__kprobes_text_end)
+ return -EINVAL;
+ return 0;
+}
+
+int __kprobes register_kprobe(struct kprobe *p)
{
int ret = 0;
unsigned long flags = 0;
struct kprobe *old_p;
- if ((ret = arch_prepare_kprobe(p)) != 0) {
+ if ((ret = in_kprobes_functions((unsigned long) p->addr)) != 0)
+ return ret;
+ if ((ret = arch_prepare_kprobe(p)) != 0)
goto rm_kprobe;
- }
+
spin_lock_irqsave(&kprobe_lock, flags);
old_p = get_kprobe(p->addr);
p->nmissed = 0;
return ret;
}
-void unregister_kprobe(struct kprobe *p)
+void __kprobes unregister_kprobe(struct kprobe *p)
{
unsigned long flags;
struct kprobe *old_p;
.priority = 0x7fffffff /* we need to notified first */
};
-int register_jprobe(struct jprobe *jp)
+int __kprobes register_jprobe(struct jprobe *jp)
{
/* Todo: Verify probepoint is a function entry point */
jp->kp.pre_handler = setjmp_pre_handler;
return register_kprobe(&jp->kp);
}
-void unregister_jprobe(struct jprobe *jp)
+void __kprobes unregister_jprobe(struct jprobe *jp)
{
unregister_kprobe(&jp->kp);
}
#ifdef ARCH_SUPPORTS_KRETPROBES
-int register_kretprobe(struct kretprobe *rp)
+int __kprobes register_kretprobe(struct kretprobe *rp)
{
int ret = 0;
struct kretprobe_instance *inst;
#else /* ARCH_SUPPORTS_KRETPROBES */
-int register_kretprobe(struct kretprobe *rp)
+int __kprobes register_kretprobe(struct kretprobe *rp)
{
return -ENOSYS;
}
#endif /* ARCH_SUPPORTS_KRETPROBES */
-void unregister_kretprobe(struct kretprobe *rp)
+void __kprobes unregister_kretprobe(struct kretprobe *rp)
{
unsigned long flags;
struct kretprobe_instance *ri;
INIT_HLIST_HEAD(&kretprobe_inst_table[i]);
}
- err = arch_init();
+ err = arch_init_kprobes();
if (!err)
err = register_die_notifier(&kprobe_exceptions_nb);
git.openpandora.org / pandora-kernel.git / blobdiff