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Subject[PATCH 2/3] Kprobes: Define retval helper
From: Ananth N Mavinakayanahalli <ananth@in.ibm.com>

Add the KPROBE_RETVAL macro to help extract the return value on
different architectures, while using function-return probes.
---
Signed-off-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Signed-off-by: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Signed-off-by: Prasanna S.P <prasanna@in.ibm.com>

---
include/asm-i386/kprobes.h | 2 ++
include/asm-ia64/kprobes.h | 2 ++
include/asm-powerpc/kprobes.h | 2 ++
include/asm-x86_64/kprobes.h | 2 ++
4 files changed, 8 insertions(+)
Index: linux-2.6.18-rc3/include/asm-i386/kprobes.h
===================================================================
--- linux-2.6.18-rc3.orig/include/asm-i386/kprobes.h
+++ linux-2.6.18-rc3/include/asm-i386/kprobes.h
@@ -46,6 +46,8 @@ typedef u8 kprobe_opcode_t;
#define ARCH_SUPPORTS_KRETPROBES
#define ARCH_INACTIVE_KPROBE_COUNT 0

+#define KPROBE_RETVAL(regs) regs->eax
+
void arch_remove_kprobe(struct kprobe *p);
void kretprobe_trampoline(void);

Index: linux-2.6.18-rc3/include/asm-ia64/kprobes.h
===================================================================
--- linux-2.6.18-rc3.orig/include/asm-ia64/kprobes.h
+++ linux-2.6.18-rc3/include/asm-ia64/kprobes.h
@@ -84,6 +84,8 @@ struct kprobe_ctlblk {
#define ARCH_SUPPORTS_KRETPROBES
#define ARCH_INACTIVE_KPROBE_COUNT 1

+#define KPROBE_RETVAL(regs) regs->r8
+
#define SLOT0_OPCODE_SHIFT (37)
#define SLOT1_p1_OPCODE_SHIFT (37 - (64-46))
#define SLOT2_OPCODE_SHIFT (37)
Index: linux-2.6.18-rc3/include/asm-powerpc/kprobes.h
===================================================================
--- linux-2.6.18-rc3.orig/include/asm-powerpc/kprobes.h
+++ linux-2.6.18-rc3/include/asm-powerpc/kprobes.h
@@ -54,6 +54,8 @@ typedef unsigned int kprobe_opcode_t;
#define ARCH_SUPPORTS_KRETPROBES
#define ARCH_INACTIVE_KPROBE_COUNT 1

+#define KPROBE_RETVAL(regs) regs->gpr[3]
+
void kretprobe_trampoline(void);
extern void arch_remove_kprobe(struct kprobe *p);

Index: linux-2.6.18-rc3/include/asm-x86_64/kprobes.h
===================================================================
--- linux-2.6.18-rc3.orig/include/asm-x86_64/kprobes.h
+++ linux-2.6.18-rc3/include/asm-x86_64/kprobes.h
@@ -45,6 +45,8 @@ typedef u8 kprobe_opcode_t;
#define ARCH_SUPPORTS_KRETPROBES
#define ARCH_INACTIVE_KPROBE_COUNT 1

+#define KPROBE_RETVAL(regs) regs->rax
+
void kretprobe_trampoline(void);
extern void arch_remove_kprobe(struct kprobe *p);

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