Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 136 insertions, 0 deletions

diff --git a/include/linux/kprobes.h b/include/linux/kprobes.h
new file mode 100644
index 000000000000..f20c163de4f5
--- /dev/null
+++ b/include/linux/kprobes.h
@@ -0,0 +1,136 @@
+#ifndef _LINUX_KPROBES_H
+#define _LINUX_KPROBES_H
+/*
+ *  Kernel Probes (KProbes)
+ *  include/linux/kprobes.h
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * Copyright (C) IBM Corporation, 2002, 2004
+ *
+ * 2002-Oct     Created by Vamsi Krishna S <vamsi_krishna@in.ibm.com> Kernel
+ *              Probes initial implementation ( includes suggestions from
+ *              Rusty Russell).
+ * 2004-July    Suparna Bhattacharya <suparna@in.ibm.com> added jumper probes
+ *              interface to access function arguments.
+ */
+#include <linux/config.h>
+#include <linux/list.h>
+#include <linux/notifier.h>
+#include <linux/smp.h>
+#include <asm/kprobes.h>
+
+struct kprobe;
+struct pt_regs;
+typedef int (*kprobe_pre_handler_t) (struct kprobe *, struct pt_regs *);
+typedef int (*kprobe_break_handler_t) (struct kprobe *, struct pt_regs *);
+typedef void (*kprobe_post_handler_t) (struct kprobe *, struct pt_regs *,
+                                       unsigned long flags);
+typedef int (*kprobe_fault_handler_t) (struct kprobe *, struct pt_regs *,
+                                       int trapnr);
+struct kprobe {
+        struct hlist_node hlist;
+
+        /* location of the probe point */
+        kprobe_opcode_t *addr;
+
+        /* Called before addr is executed. */
+        kprobe_pre_handler_t pre_handler;
+
+        /* Called after addr is executed, unless... */
+        kprobe_post_handler_t post_handler;
+
+        /* ... called if executing addr causes a fault (eg. page fault).
+         * Return 1 if it handled fault, otherwise kernel will see it. */
+        kprobe_fault_handler_t fault_handler;
+
+        /* ... called if breakpoint trap occurs in probe handler.
+         * Return 1 if it handled break, otherwise kernel will see it. */
+        kprobe_break_handler_t break_handler;
+
+        /* Saved opcode (which has been replaced with breakpoint) */
+        kprobe_opcode_t opcode;
+
+        /* copy of the original instruction */
+        struct arch_specific_insn ainsn;
+};
+
+/*
+ * Special probe type that uses setjmp-longjmp type tricks to resume
+ * execution at a specified entry with a matching prototype corresponding
+ * to the probed function - a trick to enable arguments to become
+ * accessible seamlessly by probe handling logic.
+ * Note:
+ * Because of the way compilers allocate stack space for local variables
+ * etc upfront, regardless of sub-scopes within a function, this mirroring
+ * principle currently works only for probes placed on function entry points.
+ */
+struct jprobe {
+        struct kprobe kp;
+        kprobe_opcode_t *entry; /* probe handling code to jump to */
+};
+
+#ifdef CONFIG_KPROBES
+/* Locks kprobe: irq must be disabled */
+void lock_kprobes(void);
+void unlock_kprobes(void);
+
+/* kprobe running now on this CPU? */
+static inline int kprobe_running(void)
+{
+        extern unsigned int kprobe_cpu;
+        return kprobe_cpu == smp_processor_id();
+}
+
+extern int arch_prepare_kprobe(struct kprobe *p);
+extern void arch_copy_kprobe(struct kprobe *p);
+extern void arch_remove_kprobe(struct kprobe *p);
+extern void show_registers(struct pt_regs *regs);
+
+/* Get the kprobe at this addr (if any).  Must have called lock_kprobes */
+struct kprobe *get_kprobe(void *addr);
+
+int register_kprobe(struct kprobe *p);
+void unregister_kprobe(struct kprobe *p);
+int setjmp_pre_handler(struct kprobe *, struct pt_regs *);
+int longjmp_break_handler(struct kprobe *, struct pt_regs *);
+int register_jprobe(struct jprobe *p);
+void unregister_jprobe(struct jprobe *p);
+void jprobe_return(void);
+
+#else
+static inline int kprobe_running(void)
+{
+        return 0;
+}
+static inline int register_kprobe(struct kprobe *p)
+{
+        return -ENOSYS;
+}
+static inline void unregister_kprobe(struct kprobe *p)
+{
+}
+static inline int register_jprobe(struct jprobe *p)
+{
+        return -ENOSYS;
+}
+static inline void unregister_jprobe(struct jprobe *p)
+{
+}
+static inline void jprobe_return(void)
+{
+}
+#endif
+#endif                          /* _LINUX_KPROBES_H */