arch/powerpc/include/asm/probes.h

   1 #ifndef _ASM_POWERPC_PROBES_H
   2 #define _ASM_POWERPC_PROBES_H
   3 #ifdef __KERNEL__
   4 /*
   5  * Definitions common to probes files
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  20  *
  21  * Copyright IBM Corporation, 2012
  22  */
  23 #include <linux/types.h>
  24
  25 typedef u32 ppc_opcode_t;
  26 #define BREAKPOINT_INSTRUCTION  0x7fe00008      /* trap */
  27
  28 /* Trap definitions per ISA */
  29 #define IS_TW(instr)            (((instr) & 0xfc0007fe) == 0x7c000008)
  30 #define IS_TD(instr)            (((instr) & 0xfc0007fe) == 0x7c000088)
  31 #define IS_TDI(instr)           (((instr) & 0xfc000000) == 0x08000000)
  32 #define IS_TWI(instr)           (((instr) & 0xfc000000) == 0x0c000000)
  33
  34 #ifdef CONFIG_PPC64
  35 #define is_trap(instr)          (IS_TW(instr) || IS_TD(instr) || \
  36                                 IS_TWI(instr) || IS_TDI(instr))
  37 #else
  38 #define is_trap(instr)          (IS_TW(instr) || IS_TWI(instr))
  39 #endif /* CONFIG_PPC64 */
  40
  41 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
  42 #define MSR_SINGLESTEP  (MSR_DE)
  43 #else
  44 #define MSR_SINGLESTEP  (MSR_SE)
  45 #endif
  46
  47 /* Enable single stepping for the current task */
  48 static inline void enable_single_step(struct pt_regs *regs)
  49 {
  50         regs->msr |= MSR_SINGLESTEP;
  51 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
  52         /*
  53          * We turn off Critical Input Exception(CE) to ensure that the single
  54          * step will be for the instruction we have the probe on; if we don't,
  55          * it is possible we'd get the single step reported for CE.
  56          */
  57         regs->msr &= ~MSR_CE;
  58         mtspr(SPRN_DBCR0, mfspr(SPRN_DBCR0) | DBCR0_IC | DBCR0_IDM);
  59 #ifdef CONFIG_PPC_47x
  60         isync();
  61 #endif
  62 #endif
  63 }
  64
  65
  66 #endif /* __KERNEL__ */
  67 #endif  /* _ASM_POWERPC_PROBES_H */