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Diffstat (limited to 'include/asm-ppc64/sstep.h')
| -rw-r--r-- | include/asm-ppc64/sstep.h | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/include/asm-ppc64/sstep.h b/include/asm-ppc64/sstep.h new file mode 100644 index 00000000000..4a68db50ee6 --- /dev/null +++ b/include/asm-ppc64/sstep.h @@ -0,0 +1,24 @@ +/* + * Copyright (C) 2004 Paul Mackerras <paulus@au.ibm.com>, IBM + * + * 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. + */ + +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); |