summaryrefslogtreecommitdiff
path: root/arch/powerpc/include/asm/probes.h
diff options
context:
space:
mode:
Diffstat (limited to 'arch/powerpc/include/asm/probes.h')
-rw-r--r--arch/powerpc/include/asm/probes.h67
1 files changed, 67 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/probes.h b/arch/powerpc/include/asm/probes.h
new file mode 100644
index 000000000..3421637cf
--- /dev/null
+++ b/arch/powerpc/include/asm/probes.h
@@ -0,0 +1,67 @@
+#ifndef _ASM_POWERPC_PROBES_H
+#define _ASM_POWERPC_PROBES_H
+#ifdef __KERNEL__
+/*
+ * Definitions common to probes files
+ *
+ * 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 IBM Corporation, 2012
+ */
+#include <linux/types.h>
+
+typedef u32 ppc_opcode_t;
+#define BREAKPOINT_INSTRUCTION 0x7fe00008 /* trap */
+
+/* Trap definitions per ISA */
+#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
+#define is_trap(instr) (IS_TW(instr) || IS_TD(instr) || \
+ IS_TWI(instr) || IS_TDI(instr))
+#else
+#define is_trap(instr) (IS_TW(instr) || IS_TWI(instr))
+#endif /* CONFIG_PPC64 */
+
+#ifdef CONFIG_PPC_ADV_DEBUG_REGS
+#define MSR_SINGLESTEP (MSR_DE)
+#else
+#define MSR_SINGLESTEP (MSR_SE)
+#endif
+
+/* Enable single stepping for the current task */
+static inline void enable_single_step(struct pt_regs *regs)
+{
+ regs->msr |= MSR_SINGLESTEP;
+#ifdef CONFIG_PPC_ADV_DEBUG_REGS
+ /*
+ * We turn off Critical Input Exception(CE) to ensure that the single
+ * step will be for the instruction we have the probe on; if we don't,
+ * it is possible we'd get the single step reported for CE.
+ */
+ regs->msr &= ~MSR_CE;
+ mtspr(SPRN_DBCR0, mfspr(SPRN_DBCR0) | DBCR0_IC | DBCR0_IDM);
+#ifdef CONFIG_PPC_47x
+ isync();
+#endif
+#endif
+}
+
+
+#endif /* __KERNEL__ */
+#endif /* _ASM_POWERPC_PROBES_H */