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Commit 4d86dfbb authored by Vineet Gupta's avatar Vineet Gupta
Browse files

ARC: kprobes support 



Origin port done by Rajeshwar Ranga

Signed-off-by: default avatarVineet Gupta <vgupta@synopsys.com>
Cc: Rajeshwar Ranga <rajeshwar.ranga@gmail.com>
parent e65ab5a8

arch/arc/Kconfig

+2 −0
Original line number Diff line number Diff line
@@ -24,6 +24,8 @@ config ARC 
	select GENERIC_SMP_IDLE_THREAD

	select HAVE_ARCH_TRACEHOOK

	select HAVE_GENERIC_HARDIRQS

	select HAVE_KPROBES

	select HAVE_KRETPROBES

	select HAVE_MEMBLOCK

	select HAVE_MOD_ARCH_SPECIFIC if ARC_DW2_UNWIND

	select HAVE_OPROFILE

arch/arc/include/asm/kprobes.h

0 → 100644
+62 −0
Original line number Diff line number Diff line 
/*

 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 */



#ifndef _ARC_KPROBES_H

#define _ARC_KPROBES_H



#ifdef CONFIG_KPROBES



typedef u16 kprobe_opcode_t;



#define UNIMP_S_INSTRUCTION 0x79e0

#define TRAP_S_2_INSTRUCTION 0x785e



#define MAX_INSN_SIZE   8

#define MAX_STACK_SIZE  64



struct arch_specific_insn {

	int is_short;

	kprobe_opcode_t *t1_addr, *t2_addr;

	kprobe_opcode_t t1_opcode, t2_opcode;

};



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



#define kretprobe_blacklist_size    0



struct kprobe;



void arch_remove_kprobe(struct kprobe *p);



int kprobe_exceptions_notify(struct notifier_block *self,

			     unsigned long val, void *data);



struct prev_kprobe {

	struct kprobe *kp;

	unsigned long status;

};



struct kprobe_ctlblk {

	unsigned int kprobe_status;

	struct pt_regs jprobe_saved_regs;

	char jprobes_stack[MAX_STACK_SIZE];

	struct prev_kprobe prev_kprobe;

};



int kprobe_fault_handler(struct pt_regs *regs, unsigned long cause);

void kretprobe_trampoline(void);

void trap_is_kprobe(unsigned long cause, unsigned long address,

			   struct pt_regs *regs);

#else

static void trap_is_kprobe(unsigned long cause, unsigned long address,

			   struct pt_regs *regs)

{

}

#endif



#endif

arch/arc/include/asm/ptrace.h

+5 −0
Original line number Diff line number Diff line
@@ -111,6 +111,11 @@ struct callee_regs { 
	(struct pt_regs *)(pg_start + THREAD_SIZE - 4) - 1;	\

})



static inline long regs_return_value(struct pt_regs *regs)

{

	return regs->r0;

}



#endif /* !__ASSEMBLY__ */



#define orig_r8_IS_SCALL		0x0001

arch/arc/kernel/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -15,6 +15,7 @@ obj-y += devtree.o 
obj-$(CONFIG_MODULES)			+= arcksyms.o module.o

obj-$(CONFIG_SMP) 			+= smp.o

obj-$(CONFIG_ARC_DW2_UNWIND)		+= unwind.o

obj-$(CONFIG_KPROBES)      		+= kprobes.o



obj-$(CONFIG_ARC_FPU_SAVE_RESTORE)	+= fpu.o

CFLAGS_fpu.o   += -mdpfp

arch/arc/kernel/disasm.c

+2 −3
Original line number Diff line number Diff line
@@ -499,7 +499,6 @@ void __kprobes set_reg(int reg, long val, struct pt_regs *regs, 
 * If @pc is a branch

 *	-@tgt_if_br is set to branch target.

 *	-If branch has delay slot, @next_pc updated with actual next PC.

 *

 */

int __kprobes disasm_next_pc(unsigned long pc, struct pt_regs *regs,

			     struct callee_regs *cregs,