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Subject[PATCH 1/2] Kprobes: Indicate kretprobe support in arch/<arch>/Kconfig
From: Ananth N Mavinakayanahalli <ananth@in.ibm.com>

This patch adds CONFIG_HAVE_KRETPROBES to the arch/<arch>/Kconfig file
for relevant architectures with kprobes support. This facilitates easy
handling of in-kernel modules (like samples/kprobes/kretprobe_example.c)
that depend on kretprobes being present in the kernel.

This patch depends on Mathieu Desnoyers' "Instrumentation menu removal"
patchset (http://marc.info/?l=linux-kernel&m=119496432229633&w=2)

Updated to apply on 2.6.24-rc4-mm1.

Signed-off-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
---
arch/avr32/Kconfig | 5 +++++
arch/ia64/Kconfig | 5 +++++
arch/powerpc/Kconfig | 5 +++++
arch/s390/Kconfig | 5 +++++
arch/sparc64/Kconfig | 5 +++++
arch/x86/Kconfig | 5 +++++
include/asm-ia64/kprobes.h | 1 -
include/asm-powerpc/kprobes.h | 1 -
include/asm-s390/kprobes.h | 1 -
include/asm-x86/kprobes_32.h | 1 -
include/asm-x86/kprobes_64.h | 1 -
include/linux/kprobes.h | 6 +++---
kernel/kprobes.c | 8 +++-----
13 files changed, 36 insertions(+), 13 deletions(-)
Index: linux-2.6.24-rc4/arch/avr32/Kconfig
===================================================================
--- linux-2.6.24-rc4.orig/arch/avr32/Kconfig
+++ linux-2.6.24-rc4/arch/avr32/Kconfig
@@ -66,6 +66,11 @@ config GENERIC_BUG
def_bool y
depends on BUG

+config HAVE_KRETPROBES
+ bool
+ depends on HAVE_KPROBES
+ default n
+
source "init/Kconfig"

menu "System Type and features"
Index: linux-2.6.24-rc4/arch/ia64/Kconfig
===================================================================
--- linux-2.6.24-rc4.orig/arch/ia64/Kconfig
+++ linux-2.6.24-rc4/arch/ia64/Kconfig
@@ -101,6 +101,11 @@ config AUDIT_ARCH
bool
default y

+config HAVE_KRETPROBES
+ bool
+ depends on HAVE_KPROBES
+ default y
+
choice
prompt "System type"
default IA64_GENERIC
Index: linux-2.6.24-rc4/arch/powerpc/Kconfig
===================================================================
--- linux-2.6.24-rc4.orig/arch/powerpc/Kconfig
+++ linux-2.6.24-rc4/arch/powerpc/Kconfig
@@ -165,6 +165,11 @@ config PPC_OF_PLATFORM_PCI
depends on PPC64 # not supported on 32 bits yet
default n

+config HAVE_KRETPROBES
+ bool
+ depends on HAVE_KPROBES
+ default y
+
source "init/Kconfig"

source "arch/powerpc/platforms/Kconfig"
Index: linux-2.6.24-rc4/arch/s390/Kconfig
===================================================================
--- linux-2.6.24-rc4.orig/arch/s390/Kconfig
+++ linux-2.6.24-rc4/arch/s390/Kconfig
@@ -54,6 +54,11 @@ config S390
select HAVE_OPROFILE
select HAVE_KPROBES

+config HAVE_KRETPROBES
+ bool
+ depends on HAVE_KPROBES
+ default y
+
source "init/Kconfig"

menu "Base setup"
Index: linux-2.6.24-rc4/arch/sparc64/Kconfig
===================================================================
--- linux-2.6.24-rc4.orig/arch/sparc64/Kconfig
+++ linux-2.6.24-rc4/arch/sparc64/Kconfig
@@ -81,6 +81,11 @@ config GENERIC_HARDIRQS_NO__DO_IRQ
config ARCH_SUPPORTS_AOUT
def_bool y

+config HAVE_KRETPROBES
+ bool
+ depends on HAVE_KPROBES
+ default n
+
choice
prompt "Kernel page size"
default SPARC64_PAGE_SIZE_8KB
Index: linux-2.6.24-rc4/arch/x86/Kconfig
===================================================================
--- linux-2.6.24-rc4.orig/arch/x86/Kconfig
+++ linux-2.6.24-rc4/arch/x86/Kconfig
@@ -145,6 +145,11 @@ config X86_TRAMPOLINE
config KTIME_SCALAR
def_bool X86_32

+config HAVE_KRETPROBES
+ bool
+ depends on HAVE_KPROBES
+ default y
+
source "init/Kconfig"

menu "Processor type and features"
Index: linux-2.6.24-rc4/include/asm-ia64/kprobes.h
===================================================================
--- linux-2.6.24-rc4.orig/include/asm-ia64/kprobes.h
+++ linux-2.6.24-rc4/include/asm-ia64/kprobes.h
@@ -82,7 +82,6 @@ struct kprobe_ctlblk {
struct prev_kprobe prev_kprobe[ARCH_PREV_KPROBE_SZ];
};

-#define ARCH_SUPPORTS_KRETPROBES
#define kretprobe_blacklist_size 0

#define SLOT0_OPCODE_SHIFT (37)
Index: linux-2.6.24-rc4/include/asm-powerpc/kprobes.h
===================================================================
--- linux-2.6.24-rc4.orig/include/asm-powerpc/kprobes.h
+++ linux-2.6.24-rc4/include/asm-powerpc/kprobes.h
@@ -80,7 +80,6 @@ typedef unsigned int kprobe_opcode_t;
#define is_trap(instr) (IS_TW(instr) || IS_TWI(instr))
#endif

-#define ARCH_SUPPORTS_KRETPROBES
#define flush_insn_slot(p) do { } while (0)
#define kretprobe_blacklist_size 0

Index: linux-2.6.24-rc4/include/asm-s390/kprobes.h
===================================================================
--- linux-2.6.24-rc4.orig/include/asm-s390/kprobes.h
+++ linux-2.6.24-rc4/include/asm-s390/kprobes.h
@@ -46,7 +46,6 @@ typedef u16 kprobe_opcode_t;
? (MAX_STACK_SIZE) \
: (((unsigned long)current_thread_info()) + THREAD_SIZE - (ADDR)))

-#define ARCH_SUPPORTS_KRETPROBES
#define kretprobe_blacklist_size 0

#define KPROBE_SWAP_INST 0x10
Index: linux-2.6.24-rc4/include/asm-x86/kprobes_32.h
===================================================================
--- linux-2.6.24-rc4.orig/include/asm-x86/kprobes_32.h
+++ linux-2.6.24-rc4/include/asm-x86/kprobes_32.h
@@ -42,7 +42,6 @@ typedef u8 kprobe_opcode_t;
? (MAX_STACK_SIZE) \
: (((unsigned long)current_thread_info()) + THREAD_SIZE - (ADDR)))

-#define ARCH_SUPPORTS_KRETPROBES
#define flush_insn_slot(p) do { } while (0)

extern const int kretprobe_blacklist_size;
Index: linux-2.6.24-rc4/include/asm-x86/kprobes_64.h
===================================================================
--- linux-2.6.24-rc4.orig/include/asm-x86/kprobes_64.h
+++ linux-2.6.24-rc4/include/asm-x86/kprobes_64.h
@@ -41,7 +41,6 @@ typedef u8 kprobe_opcode_t;
? (MAX_STACK_SIZE) \
: (((unsigned long)current_thread_info()) + THREAD_SIZE - (ADDR)))

-#define ARCH_SUPPORTS_KRETPROBES
extern const int kretprobe_blacklist_size;

void kretprobe_trampoline(void);
Index: linux-2.6.24-rc4/include/linux/kprobes.h
===================================================================
--- linux-2.6.24-rc4.orig/include/linux/kprobes.h
+++ linux-2.6.24-rc4/include/linux/kprobes.h
@@ -125,11 +125,11 @@ struct jprobe {
DECLARE_PER_CPU(struct kprobe *, current_kprobe);
DECLARE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk);

-#ifdef ARCH_SUPPORTS_KRETPROBES
+#ifdef CONFIG_HAVE_KRETPROBES
extern void arch_prepare_kretprobe(struct kretprobe_instance *ri,
struct pt_regs *regs);
extern int arch_trampoline_kprobe(struct kprobe *p);
-#else /* ARCH_SUPPORTS_KRETPROBES */
+#else /* CONFIG_HAVE_KRETPROBES */
static inline void arch_prepare_kretprobe(struct kretprobe *rp,
struct pt_regs *regs)
{
@@ -138,7 +138,7 @@ static inline int arch_trampoline_kprobe
{
return 0;
}
-#endif /* ARCH_SUPPORTS_KRETPROBES */
+#endif /* CONFIG_HAVE_KRETPROBES */
/*
* Function-return probe -
* Note:
Index: linux-2.6.24-rc4/kernel/kprobes.c
===================================================================
--- linux-2.6.24-rc4.orig/kernel/kprobes.c
+++ linux-2.6.24-rc4/kernel/kprobes.c
@@ -678,8 +678,7 @@ void __kprobes unregister_jprobe(struct
unregister_kprobe(&jp->kp);
}

-#ifdef ARCH_SUPPORTS_KRETPROBES
-
+#ifdef CONFIG_HAVE_KRETPROBES
/*
* This kprobe pre_handler is registered with every kretprobe. When probe
* hits it will set up the return probe.
@@ -762,7 +761,7 @@ int __kprobes register_kretprobe(struct
return ret;
}

-#else /* ARCH_SUPPORTS_KRETPROBES */
+#else /* CONFIG_HAVE_KRETPROBES */

int __kprobes register_kretprobe(struct kretprobe *rp)
{
@@ -774,8 +773,7 @@ static int __kprobes pre_handler_kretpro
{
return 0;
}
-
-#endif /* ARCH_SUPPORTS_KRETPROBES */
+#endif /* CONFIG_HAVE_KRETPROBES */

void __kprobes unregister_kretprobe(struct kretprobe *rp)
{

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