1 files changed, 118 insertions, 0 deletions

diff --git a/arch/powerpc/include/asm/kprobes.h b/arch/powerpc/include/asm/kprobes.h
new file mode 100644
index 000000000000..d0e7701fa1f6
--- /dev/null
+++ b/arch/powerpc/include/asm/kprobes.h
@@ -0,0 +1,118 @@
+#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>
+
+#define  __ARCH_WANT_KPROBES_INSN_SLOT
+
+struct pt_regs;
+struct kprobe;
+
+typedef unsigned int kprobe_opcode_t;
+#define BREAKPOINT_INSTRUCTION  0x7fe00008      /* trap */
+#define MAX_INSN_SIZE 1
+
+#define IS_TW(instr)            (((instr) & 0xfc0007fe) == 0x7c000008)
+#define IS_TD(instr)            (((instr) & 0xfc0007fe) == 0x7c000088)
+#define IS_TDI(instr)           (((instr) & 0xfc000000) == 0x08000000)
+#define IS_TWI(instr)           (((instr) & 0xfc000000) == 0x0c000000)
+
+#ifdef CONFIG_PPC64
+/*
+ * 64bit powerpc uses function descriptors.
+ * Handle cases where:
+ *              - User passes a <.symbol> or <module:.symbol>
+ *              - User passes a <symbol> or <module:symbol>
+ *              - User passes a non-existant symbol, kallsyms_lookup_name
+ *                returns 0. Don't deref the NULL pointer in that case
+ */
+#define kprobe_lookup_name(name, addr)                                  \
+{                                                                       \
+        addr = (kprobe_opcode_t *)kallsyms_lookup_name(name);           \
+        if (addr) {                                                     \
+                char *colon;                                            \
+                if ((colon = strchr(name, ':')) != NULL) {              \
+                        colon++;                                        \
+                        if (*colon != '\0' && *colon != '.')            \
+                                addr = *(kprobe_opcode_t **)addr;       \
+                } else if (name[0] != '.')                              \
+                        addr = *(kprobe_opcode_t **)addr;               \
+        } else {                                                        \
+                char dot_name[KSYM_NAME_LEN];                           \
+                dot_name[0] = '.';                                      \
+                dot_name[1] = '\0';                                     \
+                strncat(dot_name, name, KSYM_NAME_LEN - 2);             \
+                addr = (kprobe_opcode_t *)kallsyms_lookup_name(dot_name); \
+        }                                                               \
+}
+
+#define is_trap(instr)  (IS_TW(instr) || IS_TD(instr) || \
+                        IS_TWI(instr) || IS_TDI(instr))
+#else
+/* Use stock kprobe_lookup_name since ppc32 doesn't use function descriptors */
+#define is_trap(instr)  (IS_TW(instr) || IS_TWI(instr))
+#endif
+
+#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 */