summaryrefslogtreecommitdiff
path: root/arch/x86/include/asm/kprobes.h
diff options
context:
space:
mode:
authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /arch/x86/include/asm/kprobes.h
Initial import
Diffstat (limited to 'arch/x86/include/asm/kprobes.h')
-rw-r--r--arch/x86/include/asm/kprobes.h120
1 files changed, 120 insertions, 0 deletions
diff --git a/arch/x86/include/asm/kprobes.h b/arch/x86/include/asm/kprobes.h
new file mode 100644
index 000000000..4421b5da4
--- /dev/null
+++ b/arch/x86/include/asm/kprobes.h
@@ -0,0 +1,120 @@
+#ifndef _ASM_X86_KPROBES_H
+#define _ASM_X86_KPROBES_H
+/*
+ * Kernel Probes (KProbes)
+ *
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.
+ *
+ * Copyright (C) IBM Corporation, 2002, 2004
+ *
+ * See arch/x86/kernel/kprobes.c for x86 kprobes history.
+ */
+#include <linux/types.h>
+#include <linux/ptrace.h>
+#include <linux/percpu.h>
+#include <asm/insn.h>
+
+#define __ARCH_WANT_KPROBES_INSN_SLOT
+
+struct pt_regs;
+struct kprobe;
+
+typedef u8 kprobe_opcode_t;
+#define BREAKPOINT_INSTRUCTION 0xcc
+#define RELATIVEJUMP_OPCODE 0xe9
+#define RELATIVEJUMP_SIZE 5
+#define RELATIVECALL_OPCODE 0xe8
+#define RELATIVE_ADDR_SIZE 4
+#define MAX_STACK_SIZE 64
+#define MIN_STACK_SIZE(ADDR) \
+ (((MAX_STACK_SIZE) < (((unsigned long)current_thread_info()) + \
+ THREAD_SIZE - (unsigned long)(ADDR))) \
+ ? (MAX_STACK_SIZE) \
+ : (((unsigned long)current_thread_info()) + \
+ THREAD_SIZE - (unsigned long)(ADDR)))
+
+#define flush_insn_slot(p) do { } while (0)
+
+/* optinsn template addresses */
+extern __visible kprobe_opcode_t optprobe_template_entry;
+extern __visible kprobe_opcode_t optprobe_template_val;
+extern __visible kprobe_opcode_t optprobe_template_call;
+extern __visible kprobe_opcode_t optprobe_template_end;
+#define MAX_OPTIMIZED_LENGTH (MAX_INSN_SIZE + RELATIVE_ADDR_SIZE)
+#define MAX_OPTINSN_SIZE \
+ (((unsigned long)&optprobe_template_end - \
+ (unsigned long)&optprobe_template_entry) + \
+ MAX_OPTIMIZED_LENGTH + RELATIVEJUMP_SIZE)
+
+extern const int kretprobe_blacklist_size;
+
+void arch_remove_kprobe(struct kprobe *p);
+asmlinkage void kretprobe_trampoline(void);
+
+/* Architecture specific copy of original instruction*/
+struct arch_specific_insn {
+ /* copy of the original instruction */
+ kprobe_opcode_t *insn;
+ /*
+ * boostable = -1: This instruction type is not boostable.
+ * boostable = 0: This instruction type is boostable.
+ * boostable = 1: This instruction has been boosted: we have
+ * added a relative jump after the instruction copy in insn,
+ * so no single-step and fixup are needed (unless there's
+ * a post_handler or break_handler).
+ */
+ int boostable;
+ bool if_modifier;
+};
+
+struct arch_optimized_insn {
+ /* copy of the original instructions */
+ kprobe_opcode_t copied_insn[RELATIVE_ADDR_SIZE];
+ /* detour code buffer */
+ kprobe_opcode_t *insn;
+ /* the size of instructions copied to detour code buffer */
+ size_t size;
+};
+
+/* Return true (!0) if optinsn is prepared for optimization. */
+static inline int arch_prepared_optinsn(struct arch_optimized_insn *optinsn)
+{
+ return optinsn->size;
+}
+
+struct prev_kprobe {
+ struct kprobe *kp;
+ unsigned long status;
+ unsigned long old_flags;
+ unsigned long saved_flags;
+};
+
+/* per-cpu kprobe control block */
+struct kprobe_ctlblk {
+ unsigned long kprobe_status;
+ unsigned long kprobe_old_flags;
+ unsigned long kprobe_saved_flags;
+ unsigned long *jprobe_saved_sp;
+ struct pt_regs jprobe_saved_regs;
+ kprobe_opcode_t jprobes_stack[MAX_STACK_SIZE];
+ struct prev_kprobe prev_kprobe;
+};
+
+extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
+extern int kprobe_exceptions_notify(struct notifier_block *self,
+ unsigned long val, void *data);
+extern int kprobe_int3_handler(struct pt_regs *regs);
+extern int kprobe_debug_handler(struct pt_regs *regs);
+#endif /* _ASM_X86_KPROBES_H */