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/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef _ASM_POWERPC_PROBES_H
#define _ASM_POWERPC_PROBES_H
#ifdef __KERNEL__
/*
* Definitions common to probes files
*
* Copyright IBM Corporation, 2012
*/
#include <linux/types.h>
#include <asm/disassemble.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
static inline bool can_single_step(u32 inst)
{
switch (get_op(inst)) {
case OP_TRAP_64: return false;
case OP_TRAP: return false;
case OP_SC: return false;
case OP_19:
switch (get_xop(inst)) {
case OP_19_XOP_RFID: return false;
case OP_19_XOP_RFMCI: return false;
case OP_19_XOP_RFDI: return false;
case OP_19_XOP_RFI: return false;
case OP_19_XOP_RFCI: return false;
case OP_19_XOP_RFSCV: return false;
case OP_19_XOP_HRFID: return false;
case OP_19_XOP_URFID: return false;
case OP_19_XOP_STOP: return false;
case OP_19_XOP_DOZE: return false;
case OP_19_XOP_NAP: return false;
case OP_19_XOP_SLEEP: return false;
case OP_19_XOP_RVWINKLE: return false;
}
break;
case OP_31:
switch (get_xop(inst)) {
case OP_31_XOP_TRAP: return false;
case OP_31_XOP_TRAP_64: return false;
case OP_31_XOP_MTMSR: return false;
case OP_31_XOP_MTMSRD: return false;
}
break;
}
return true;
}
/* Enable single stepping for the current task */
static inline void enable_single_step(struct pt_regs *regs)
{
regs_set_return_msr(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_set_return_msr(regs, 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 */
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