[PATCH] Kprobes/IA64: architecture specific JProbes support

This patch adds IA64 architecture specific JProbes support on top of Kprobes

Signed-off-by: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Signed-off-by: Rusty Lynch <Rusty.lynch@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

3 files changed, 84 insertions, 7 deletions

diff --git a/arch/ia64/kernel/Makefile b/arch/ia64/kernel/Makefile
index 5290fa4c3371..b2e2f6509eb0 100644
--- a/arch/ia64/kernel/Makefile
+++ b/arch/ia64/kernel/Makefile
@@ -20,7 +20,7 @@ obj-$(CONFIG_SMP)		+= smp.o smpboot.o domain.o
 obj-$(CONFIG_PERFMON)           += perfmon_default_smpl.o
 obj-$(CONFIG_IA64_CYCLONE)      += cyclone.o
 obj-$(CONFIG_IA64_MCA_RECOVERY) += mca_recovery.o
-obj-$(CONFIG_KPROBES)           += kprobes.o
+obj-$(CONFIG_KPROBES)           += kprobes.o jprobes.o
 obj-$(CONFIG_IA64_UNCACHED_ALLOCATOR)   += uncached.o
 mca_recovery-y                  += mca_drv.o mca_drv_asm.o
 
diff --git a/arch/ia64/kernel/jprobes.S b/arch/ia64/kernel/jprobes.S
new file mode 100644
index 000000000000..b7fa3ccd2b0f
--- /dev/null
+++ b/arch/ia64/kernel/jprobes.S
@@ -0,0 +1,61 @@
+/*
+ * Jprobe specific operations
+ *
+ * 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) Intel Corporation, 2005
+ *
+ * 2005-May     Rusty Lynch <rusty.lynch@intel.com> and Anil S Keshavamurthy
+ *              <anil.s.keshavamurthy@intel.com> initial implementation
+ *
+ * Jprobes (a.k.a. "jump probes" which is built on-top of kprobes) allow a
+ * probe to be inserted into the beginning of a function call.  The fundamental
+ * difference between a jprobe and a kprobe is the jprobe handler is executed
+ * in the same context as the target function, while the kprobe handlers
+ * are executed in interrupt context.
+ *
+ * For jprobes we initially gain control by placing a break point in the
+ * first instruction of the targeted function.  When we catch that specific
+ * break, we:
+ *        * set the return address to our jprobe_inst_return() function
+ *        * jump to the jprobe handler function
+ *
+ * Since we fixed up the return address, the jprobe handler will return to our
+ * jprobe_inst_return() function, giving us control again.  At this point we
+ * are back in the parents frame marker, so we do yet another call to our
+ * jprobe_break() function to fix up the frame marker as it would normally
+ * exist in the target function.
+ *
+ * Our jprobe_return function then transfers control back to kprobes.c by
+ * executing a break instruction using one of our reserved numbers.  When we
+ * catch that break in kprobes.c, we continue like we do for a normal kprobe
+ * by single stepping the emulated instruction, and then returning execution
+ * to the correct location.
+ */
+#include <asm/asmmacro.h>
+
+        /*
+         * void jprobe_break(void)
+         */
+ENTRY(jprobe_break)
+        break.m 0x80300
+END(jprobe_break)
+
+        /*
+         * void jprobe_inst_return(void)
+         */
+GLOBAL_ENTRY(jprobe_inst_return)
+        br.call.sptk.many b0=jprobe_break
+END(jprobe_inst_return)
diff --git a/arch/ia64/kernel/kprobes.c b/arch/ia64/kernel/kprobes.c
index 81a53f99a573..6683a44f419f 100644
--- a/arch/ia64/kernel/kprobes.c
+++ b/arch/ia64/kernel/kprobes.c
@@ -35,12 +35,15 @@
 #include <asm/pgtable.h>
 #include <asm/kdebug.h>
 
+extern void jprobe_inst_return(void);
+
 /* kprobe_status settings */
 #define KPROBE_HIT_ACTIVE       0x00000001
 #define KPROBE_HIT_SS           0x00000002
 
 static struct kprobe *current_kprobe;
 static unsigned long kprobe_status;
+static struct pt_regs jprobe_saved_regs;
 
 enum instruction_type {A, I, M, F, B, L, X, u};
 static enum instruction_type bundle_encoding[32][3] = {
@@ -318,15 +321,28 @@ int kprobe_exceptions_notify(struct notifier_block *self, unsigned long val,
 
 int setjmp_pre_handler(struct kprobe *p, struct pt_regs *regs)
 {
-        printk(KERN_WARNING "Jprobes is not supported\n");
-        return 0;
-}
+        struct jprobe *jp = container_of(p, struct jprobe, kp);
+        unsigned long addr = ((struct fnptr *)(jp->entry))->ip;
 
-void jprobe_return(void)
-{
+        /* save architectural state */
+        jprobe_saved_regs = *regs;
+
+        /* after rfi, execute the jprobe instrumented function */
+        regs->cr_iip = addr & ~0xFULL;
+        ia64_psr(regs)->ri = addr & 0xf;
+        regs->r1 = ((struct fnptr *)(jp->entry))->gp;
+
+        /*
+         * fix the return address to our jprobe_inst_return() function
+         * in the jprobes.S file
+         */
+        regs->b0 = ((struct fnptr *)(jprobe_inst_return))->ip;
+
+        return 1;
 }
 
 int longjmp_break_handler(struct kprobe *p, struct pt_regs *regs)
 {
-        return 0;
+        *regs = jprobe_saved_regs;
+        return 1;
 }