On Tue, Aug 08, 2006 at 05:25:59PM +0100, Christoph Hellwig wrote:
> On Mon, Aug 07, 2006 at 05:30:24PM +0530, Ananth N Mavinakayanahalli wrote:
> > From: Ananth N Mavinakayanahalli <[email protected]>
> >
> > Add the KPROBE_RETVAL macro to help extract the return value on
> > different architectures, while using function-return probes.
>
> Good idea. You should add parentheses around regs, otherwise the C
> preprocessor might bite users. Also the shouting name is quite ugly.
> In fact it should probably go to asm/system.h or similar and not have
> a kprobes name - it just extracts the return value from a struct pt_regs
> after all.
Done! How does this look? I added it to asm/ptrace.h so it lives along
with the instruction_pointer() definition.
Ananth
---
Add the "get_retval" 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 <[email protected]>
---
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 get_retval(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 get_retval(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 get_retval(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 get_retval(regs) ((regs)->rax)
+
extern unsigned long profile_pc(struct pt_regs *regs);
void signal_fault(struct pt_regs *regs, void __user *frame, char *where);
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
