vserver 1.9.5.x5

[linux-2.6.git] / include / asm-ppc64 / sstep.h

diff --git a/include/asm-ppc64/sstep.h b/include/asm-ppc64/sstep.h
index 448190d..4a68db5 100644 (file)
--- a/include/asm-ppc64/sstep.h
+++ b/include/asm-ppc64/sstep.h
@@ -9,5 +9,16 @@
 
 struct pt_regs;
 
+/*
+ * We don't allow single-stepping an mtmsrd that would clear
+ * MSR_RI, since that would make the exception unrecoverable.
+ * Since we need to single-step to proceed from a breakpoint,
+ * we don't allow putting a breakpoint on an mtmsrd instruction.
+ * Similarly we don't allow breakpoints on rfid instructions.
+ * These macros tell us if an instruction is a mtmsrd or rfid.
+ */
+#define IS_MTMSRD(instr)       (((instr) & 0xfc0007fe) == 0x7c000164)
+#define IS_RFID(instr)         (((instr) & 0xfc0007fe) == 0x4c000024)
+
 /* Emulate instructions that cause a transfer of control. */
 extern int emulate_step(struct pt_regs *regs, unsigned int instr);