linux-kernel - Re: [PATCH 2/3] Kprobes: Define retval helper

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Date:	Wed, 9 Aug 2006 15:49:48 +0530
From:	Ananth N Mavinakayanahalli <ananth@...ibm.com>
To:	Andi Kleen <ak@...e.de>
Cc:	Christoph Hellwig <hch@...radead.org>,
	linux-kernel@...r.kernel.org,
	Prasanna S Panchamukhi <prasanna@...ibm.com>,
	Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
	Jim Keniston <jkenisto@...ibm.com>, linux-arch@...r.kernel.org
Subject: Re: [PATCH 2/3] Kprobes: Define retval helper

On Wed, Aug 09, 2006 at 11:55:50AM +0200, Andi Kleen wrote:
> 
> > >  #define instruction_pointer(regs) ((regs)->eip)
> > > +#define get_retval(regs) ((regs)->eax)
> 
> return_value() would match the names of the existing macro better
 
Updated patch ...

Add the "return_value" macro that just extracts the return value given
the pt_regs. Useful in situations such as while using function-return
probes.


Signed-off-by: Ananth N Mavinakayanahalli <ananth@...ibm.com>

---
 include/asm-i386/ptrace.h    |    3 +++
 include/asm-ia64/ptrace.h    |    3 +++
 include/asm-powerpc/ptrace.h |    2 ++
 include/asm-x86_64/ptrace.h  |    2 ++
 4 files changed, 10 insertions(+)

Index: linux-2.6.18-rc3/include/asm-i386/ptrace.h
===================================================================
--- linux-2.6.18-rc3.orig/include/asm-i386/ptrace.h
+++ linux-2.6.18-rc3/include/asm-i386/ptrace.h
@@ -79,7 +79,10 @@ static inline int user_mode_vm(struct pt
 {
 	return ((regs->xcs & 3) | (regs->eflags & VM_MASK)) != 0;
 }
+
 #define instruction_pointer(regs) ((regs)->eip)
+#define return_value(regs) ((regs)->eax)
+
 #if defined(CONFIG_SMP) && defined(CONFIG_FRAME_POINTER)
 extern unsigned long profile_pc(struct pt_regs *regs);
 #else
Index: linux-2.6.18-rc3/include/asm-ia64/ptrace.h
===================================================================
--- linux-2.6.18-rc3.orig/include/asm-ia64/ptrace.h
+++ linux-2.6.18-rc3/include/asm-ia64/ptrace.h
@@ -237,6 +237,9 @@ struct switch_stack {
  * the canonical representation by adding to instruction pointer.
  */
 # define instruction_pointer(regs) ((regs)->cr_iip + ia64_psr(regs)->ri)
+
+#define return_value(regs) ((regs)->r8)
+
 /* Conserve space in histogram by encoding slot bits in address
  * bits 2 and 3 rather than bits 0 and 1.
  */
Index: linux-2.6.18-rc3/include/asm-powerpc/ptrace.h
===================================================================
--- linux-2.6.18-rc3.orig/include/asm-powerpc/ptrace.h
+++ linux-2.6.18-rc3/include/asm-powerpc/ptrace.h
@@ -73,6 +73,8 @@ struct pt_regs {
 #ifndef __ASSEMBLY__
 
 #define instruction_pointer(regs) ((regs)->nip)
+#define return_value(regs) ((regs)->gpr[3])
+
 #ifdef CONFIG_SMP
 extern unsigned long profile_pc(struct pt_regs *regs);
 #else
Index: linux-2.6.18-rc3/include/asm-x86_64/ptrace.h
===================================================================
--- linux-2.6.18-rc3.orig/include/asm-x86_64/ptrace.h
+++ linux-2.6.18-rc3/include/asm-x86_64/ptrace.h
@@ -84,6 +84,8 @@ struct pt_regs {
 #define user_mode(regs) (!!((regs)->cs & 3))
 #define user_mode_vm(regs) user_mode(regs)
 #define instruction_pointer(regs) ((regs)->rip)
+#define return_value(regs) ((regs)->rax)
+
 extern unsigned long profile_pc(struct pt_regs *regs);
 void signal_fault(struct pt_regs *regs, void __user *frame, char *where);
 
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