From c032524f0ddea5fcc3a2cece0d4a61f37e5ca9cd Mon Sep 17 00:00:00 2001 From: Paul Mackerras Date: Fri, 28 Oct 2005 22:48:08 +1000 Subject: powerpc: Make single-stepping emulation (mostly) usable on 32-bit The sc instruction emulation can't be done the same way on 32-bit as 64-bit yet, but this should work OK. Signed-off-by: Paul Mackerras --- include/asm-powerpc/sstep.h | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) create mode 100644 include/asm-powerpc/sstep.h (limited to 'include/asm-powerpc/sstep.h') diff --git a/include/asm-powerpc/sstep.h b/include/asm-powerpc/sstep.h new file mode 100644 index 00000000000..630a9889c07 --- /dev/null +++ b/include/asm-powerpc/sstep.h @@ -0,0 +1,26 @@ +/* + * Copyright (C) 2004 Paul Mackerras , 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. + * Note that IS_MTMSRD returns true for both an mtmsr (32-bit) + * and an mtmsrd (64-bit). + */ +#define IS_MTMSRD(instr) (((instr) & 0xfc0007be) == 0x7c000124) +#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); -- cgit v1.2.3