Initial import

1 files changed, 133 insertions, 0 deletions

diff --git a/arch/powerpc/include/asm/kprobes.h b/arch/powerpc/include/asm/kprobes.h
new file mode 100644
index 000000000..039b583db
--- /dev/null
+++ b/arch/powerpc/include/asm/kprobes.h
@@ -0,0 +1,133 @@
+#ifndef _ASM_POWERPC_KPROBES_H
+#define _ASM_POWERPC_KPROBES_H
+#ifdef __KERNEL__
+/*
+ *  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
+ *
+ * 2002-Oct	Created by Vamsi Krishna S <vamsi_krishna@in.ibm.com> Kernel
+ *		Probes initial implementation ( includes suggestions from
+ *		Rusty Russell).
+ * 2004-Nov	Modified for PPC64 by Ananth N Mavinakayanahalli
+ *		<ananth@in.ibm.com>
+ */
+#include <linux/types.h>
+#include <linux/ptrace.h>
+#include <linux/percpu.h>
+#include <asm/probes.h>
+#include <asm/code-patching.h>
+
+#define  __ARCH_WANT_KPROBES_INSN_SLOT
+
+struct pt_regs;
+struct kprobe;
+
+typedef ppc_opcode_t kprobe_opcode_t;
+#define MAX_INSN_SIZE 1
+
+#ifdef CONFIG_PPC64
+#if defined(_CALL_ELF) && _CALL_ELF == 2
+/* PPC64 ABIv2 needs local entry point */
+#define kprobe_lookup_name(name, addr)					\
+{									\
+	addr = (kprobe_opcode_t *)kallsyms_lookup_name(name);		\
+	if (addr)							\
+		addr = (kprobe_opcode_t *)ppc_function_entry(addr);	\
+}
+#else
+/*
+ * 64bit powerpc ABIv1 uses function descriptors:
+ * - Check for the dot variant of the symbol first.
+ * - If that fails, try looking up the symbol provided.
+ *
+ * This ensures we always get to the actual symbol and not the descriptor.
+ * Also handle <module:symbol> format.
+ */
+#define kprobe_lookup_name(name, addr)					\
+{									\
+	char dot_name[MODULE_NAME_LEN + 1 + KSYM_NAME_LEN];		\
+	char *modsym;							\
+	bool dot_appended = false;					\
+	if ((modsym = strchr(name, ':')) != NULL) {			\
+		modsym++;						\
+		if (*modsym != '\0' && *modsym != '.') {		\
+			/* Convert to <module:.symbol> */		\
+			strncpy(dot_name, name, modsym - name);		\
+			dot_name[modsym - name] = '.';			\
+			dot_name[modsym - name + 1] = '\0';		\
+			strncat(dot_name, modsym,			\
+				sizeof(dot_name) - (modsym - name) - 2);\
+			dot_appended = true;				\
+		} else {						\
+			dot_name[0] = '\0';				\
+			strncat(dot_name, name, sizeof(dot_name) - 1);	\
+		}							\
+	} else if (name[0] != '.') {					\
+		dot_name[0] = '.';					\
+		dot_name[1] = '\0';					\
+		strncat(dot_name, name, KSYM_NAME_LEN - 2);		\
+		dot_appended = true;					\
+	} else {							\
+		dot_name[0] = '\0';					\
+		strncat(dot_name, name, KSYM_NAME_LEN - 1);		\
+	}								\
+	addr = (kprobe_opcode_t *)kallsyms_lookup_name(dot_name);	\
+	if (!addr && dot_appended) {					\
+		/* Let's try the original non-dot symbol lookup	*/	\
+		addr = (kprobe_opcode_t *)kallsyms_lookup_name(name);	\
+	}								\
+}
+#endif /* defined(_CALL_ELF) && _CALL_ELF == 2 */
+#endif /* CONFIG_PPC64 */
+
+#define flush_insn_slot(p)	do { } while (0)
+#define kretprobe_blacklist_size 0
+
+void kretprobe_trampoline(void);
+extern void arch_remove_kprobe(struct kprobe *p);
+
+/* Architecture specific copy of original instruction */
+struct arch_specific_insn {
+	/* copy of original instruction */
+	kprobe_opcode_t *insn;
+	/*
+	 * Set in kprobes code, initially to 0. If the instruction can be
+	 * eumulated, this is set to 1, if not, to -1.
+	 */
+	int boostable;
+};
+
+struct prev_kprobe {
+	struct kprobe *kp;
+	unsigned long status;
+	unsigned long saved_msr;
+};
+
+/* per-cpu kprobe control block */
+struct kprobe_ctlblk {
+	unsigned long kprobe_status;
+	unsigned long kprobe_saved_msr;
+	struct pt_regs jprobe_saved_regs;
+	struct prev_kprobe prev_kprobe;
+};
+
+extern int kprobe_exceptions_notify(struct notifier_block *self,
+					unsigned long val, void *data);
+extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
+#endif /* __KERNEL__ */
+#endif	/* _ASM_POWERPC_KPROBES_H */