diff options
author | David Daney <ddaney@caviumnetworks.com> | 2010-08-03 22:22:20 +0400 |
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committer | Ralf Baechle <ralf@linux-mips.org> | 2010-08-05 16:26:29 +0400 |
commit | c1bf207d6ee1eb72e9c10365edbdc7c9ff7fb9b0 (patch) | |
tree | 4c5875c8bd9087cd7b2193ac264c002cc384febb /arch/mips/include/asm/kprobes.h | |
parent | 2ea6399f553bf9a47260723b44d50f747e310218 (diff) | |
download | linux-c1bf207d6ee1eb72e9c10365edbdc7c9ff7fb9b0.tar.xz |
MIPS: kprobe: Add support.
This patch is based on previous work by Sony and Himanshu Chauhan.
I have done some cleanup and implemented JProbes and KRETPROBES. The
KRETPROBES part is pretty much copied verbatim from powerpc. A possible
future enhance might be to factor out the common code.
Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Cc: Himanshu Chauhan <hschauhan@nulltrace.org>
To: linux-mips@linux-mips.org
To: ananth@in.ibm.com,
To: anil.s.keshavamurthy@intel.com
To: davem@davemloft.net
To: masami.hiramatsu.pt@hitachi.com
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/1525/
Patchwork: https://patchwork.linux-mips.org/patch/1530/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/include/asm/kprobes.h')
-rw-r--r-- | arch/mips/include/asm/kprobes.h | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/arch/mips/include/asm/kprobes.h b/arch/mips/include/asm/kprobes.h new file mode 100644 index 000000000000..e6ea4d4d7205 --- /dev/null +++ b/arch/mips/include/asm/kprobes.h @@ -0,0 +1,92 @@ +/* + * Kernel Probes (KProbes) + * include/asm-mips/kprobes.h + * + * Copyright 2006 Sony Corp. + * Copyright 2010 Cavium Networks + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#ifndef _ASM_KPROBES_H +#define _ASM_KPROBES_H + +#include <linux/ptrace.h> +#include <linux/types.h> + +#include <asm/cacheflush.h> +#include <asm/kdebug.h> +#include <asm/inst.h> + +#define __ARCH_WANT_KPROBES_INSN_SLOT + +struct kprobe; +struct pt_regs; + +typedef union mips_instruction kprobe_opcode_t; + +#define MAX_INSN_SIZE 2 + +#define flush_insn_slot(p) \ +do { \ + flush_icache_range((unsigned long)p->addr, \ + (unsigned long)p->addr + \ + (MAX_INSN_SIZE * sizeof(kprobe_opcode_t))); \ +} while (0) + + +#define kretprobe_blacklist_size 0 + +void arch_remove_kprobe(struct kprobe *p); + +/* Architecture specific copy of original instruction*/ +struct arch_specific_insn { + /* copy of the original instruction */ + kprobe_opcode_t *insn; +}; + +struct prev_kprobe { + struct kprobe *kp; + unsigned long status; + unsigned long old_SR; + unsigned long saved_SR; + unsigned long saved_epc; +}; + +#define MAX_JPROBES_STACK_SIZE 128 +#define MAX_JPROBES_STACK_ADDR \ + (((unsigned long)current_thread_info()) + THREAD_SIZE - 32 - sizeof(struct pt_regs)) + +#define MIN_JPROBES_STACK_SIZE(ADDR) \ + ((((ADDR) + MAX_JPROBES_STACK_SIZE) > MAX_JPROBES_STACK_ADDR) \ + ? MAX_JPROBES_STACK_ADDR - (ADDR) \ + : MAX_JPROBES_STACK_SIZE) + + +/* per-cpu kprobe control block */ +struct kprobe_ctlblk { + unsigned long kprobe_status; + unsigned long kprobe_old_SR; + unsigned long kprobe_saved_SR; + unsigned long kprobe_saved_epc; + unsigned long jprobe_saved_sp; + struct pt_regs jprobe_saved_regs; + u8 jprobes_stack[MAX_JPROBES_STACK_SIZE]; + struct prev_kprobe prev_kprobe; +}; + +extern int kprobe_exceptions_notify(struct notifier_block *self, + unsigned long val, void *data); + +#endif /* _ASM_KPROBES_H */ |