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SubjectRe: [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@in.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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