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Kprobes: indicate kretprobe support in Kconfig 

Add 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.

Thanks to Sam Ravnborg for helping make the patch more lean.

Per Mathieu's suggestion, added CONFIG_KRETPROBES and fixed up dependencies.

Signed-off-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Acked-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Ananth N Mavinakayanahalli 2008-03-04 14:28:37 -08:00 committed by Linus Torvalds
parent 8182ec49a7
commit 9edddaa200
15 changed files with 19 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
arch/Kconfig
View File

@ -27,5 +27,12 @@ config KPROBES
for kernel debugging, non-intrusive instrumentation and testing.
If in doubt, say "N".
config KRETPROBES
def_bool y
depends on KPROBES && HAVE_KRETPROBES
config HAVE_KPROBES
def_bool n
config HAVE_KRETPROBES
def_bool n

1
arch/arm/Kconfig
View File

@ -12,6 +12,7 @@ config ARM
select SYS_SUPPORTS_APM_EMULATION
select HAVE_OPROFILE
select HAVE_KPROBES if (!XIP_KERNEL)
select HAVE_KRETPROBES if (HAVE_KPROBES)
help
The ARM series is a line of low-power-consumption RISC chip designs
licensed by ARM Ltd and targeted at embedded applications and

1
arch/ia64/Kconfig
View File

@ -18,6 +18,7 @@ config IA64
select HAVE_IDE
select HAVE_OPROFILE
select HAVE_KPROBES
select HAVE_KRETPROBES
default y
help
The Itanium Processor Family is Intel's 64-bit successor to

1
arch/powerpc/Kconfig
View File

@ -90,6 +90,7 @@ config PPC
select HAVE_IDE
select HAVE_OPROFILE
select HAVE_KPROBES
select HAVE_KRETPROBES
config EARLY_PRINTK
bool

1
arch/s390/Kconfig
View File

@ -61,6 +61,7 @@ config S390
def_bool y
select HAVE_OPROFILE
select HAVE_KPROBES
select HAVE_KRETPROBES
source "init/Kconfig"

1
arch/sparc64/Kconfig
View File

@ -10,6 +10,7 @@ config SPARC
default y
select HAVE_OPROFILE
select HAVE_KPROBES
select HAVE_KRETPROBES
config SPARC64
bool

1
arch/x86/Kconfig
View File

@ -21,6 +21,7 @@ config X86
select HAVE_IDE
select HAVE_OPROFILE
select HAVE_KPROBES
select HAVE_KRETPROBES
select HAVE_KVM if ((X86_32 && !X86_VOYAGER && !X86_VISWS && !X86_NUMAQ) || X86_64)

1
include/asm-arm/kprobes.h
View File

@ -20,7 +20,6 @@
#include <linux/ptrace.h>
#include <linux/percpu.h>
#define ARCH_SUPPORTS_KRETPROBES
#define __ARCH_WANT_KPROBES_INSN_SLOT
#define MAX_INSN_SIZE 2
#define MAX_STACK_SIZE 64 /* 32 would probably be OK */

1
include/asm-ia64/kprobes.h
View File

@ -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)

1
include/asm-powerpc/kprobes.h
View File

@ -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

1
include/asm-s390/kprobes.h
View File

@ -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

2
include/asm-sparc64/kprobes.h
View File

@ -14,8 +14,6 @@ typedef u32 kprobe_opcode_t;
#define arch_remove_kprobe(p) do {} while (0)
#define ARCH_SUPPORTS_KRETPROBES
#define flush_insn_slot(p) \
do { flushi(&(p)->ainsn.insn[0]); \
flushi(&(p)->ainsn.insn[1]); \

1
include/asm-x86/kprobes.h
View File

@ -42,7 +42,6 @@ typedef u8 kprobe_opcode_t;
: (((unsigned long)current_thread_info()) + THREAD_SIZE \
- (unsigned long)(ADDR)))
#define ARCH_SUPPORTS_KRETPROBES
#define flush_insn_slot(p) do { } while (0)
extern const int kretprobe_blacklist_size;

6
include/linux/kprobes.h
View File

@ -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_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_KRETPROBES */
static inline void arch_prepare_kretprobe(struct kretprobe *rp,
struct pt_regs *regs)
{
@ -138,7 +138,7 @@ static inline int arch_trampoline_kprobe(struct kprobe *p)
{
return 0;
}
#endif /* ARCH_SUPPORTS_KRETPROBES */
#endif /* CONFIG_KRETPROBES */
/*
* Function-return probe -
* Note:

9
kernel/kprobes.c
View File

@ -678,8 +678,7 @@ void __kprobes unregister_jprobe(struct jprobe *jp)
unregister_kprobe(&jp->kp);
}
#ifdef ARCH_SUPPORTS_KRETPROBES
#ifdef CONFIG_KRETPROBES
/*
* This kprobe pre_handler is registered with every kretprobe. When probe
* hits it will set up the return probe.
@ -769,8 +768,7 @@ int __kprobes register_kretprobe(struct kretprobe *rp)
return ret;
}
#else /* ARCH_SUPPORTS_KRETPROBES */
#else /* CONFIG_KRETPROBES */
int __kprobes register_kretprobe(struct kretprobe *rp)
{
return -ENOSYS;
@ -781,8 +779,7 @@ static int __kprobes pre_handler_kretprobe(struct kprobe *p,
{
return 0;
}
#endif /* ARCH_SUPPORTS_KRETPROBES */
#endif /* CONFIG_KRETPROBES */
void __kprobes unregister_kretprobe(struct kretprobe *rp)
{